/* roulang page: index */
:root {
            --bg-deep: #0A0F1E;
            --bg-dark: #0D1428;
            --brand-blue: #1B2A4A;
            --brand-blue-light: #14335C;
            --accent-cyan: #35C8F0;
            --accent-green: #7DFF6E;
            --accent-gold: #F4B956;
            --text-main: #D8E2F0;
            --text-secondary: #8DA3C7;
            --text-muted: #5C6F8F;
            --card-bg: rgba(255,255,255,0.05);
            --card-bg-hover: rgba(255,255,255,0.10);
            --card-border: rgba(255,255,255,0.12);
            --card-radius: 16px;
            --card-radius-sm: 8px;
            --card-padding: 24px;
            --card-shadow: 0 8px 32px rgba(0,0,0,0.35);
            --card-shadow-hover: 0 12px 40px rgba(0,0,0,0.45);
            --transition: 220ms ease;
            --container-width: 1200px;
            --section-gap: 96px;
            --card-gap: 24px;
            --font-main: 'PingFang SC','Microsoft YaHei','Inter','Roboto Condensed',sans-serif;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-main);
            background-color: var(--bg-deep);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--card-radius-sm);
        }

        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover {
            color: var(--accent-green);
        }

        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }

        button {
            cursor: pointer;
            background: none;
        }

        input:focus, select:focus, textarea:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: linear-gradient(135deg, var(--brand-blue) 0%, var(--bg-deep) 80%);
            border-bottom: 1px solid rgba(255,255,255,0.08);
            box-shadow: 0 4px 20px rgba(0,0,0,0.3);
        }

        .nav-container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            gap: 24px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .nav-logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #E7F0FF;
            font-weight: 700;
            font-size: 1.4rem;
            letter-spacing: 0.5px;
            transition: opacity var(--transition);
        }

        .nav-logo a:hover {
            color: #E7F0FF;
            opacity: 0.85;
        }

        .nav-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--brand-blue-light));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            font-weight: 800;
            box-shadow: 0 0 16px rgba(53,200,240,0.4);
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            flex-wrap: wrap;
        }

        .nav-menu li a {
            display: block;
            padding: 8px 14px;
            color: #E7F0FF;
            font-size: 0.92rem;
            font-weight: 500;
            border-radius: 6px;
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }

        .nav-menu li a:hover,
        .nav-menu li a.active {
            background: rgba(255,255,255,0.12);
            color: #fff;
        }

        .nav-menu li a.active {
            box-shadow: inset 0 -2px 0 var(--accent-cyan);
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .nav-cta .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 10px 22px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 0 0 20px rgba(53,200,240,0.35);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .nav-cta .btn-primary:hover {
            box-shadow: 0 0 32px rgba(53,200,240,0.55);
            transform: translateY(-1px);
        }

        .nav-cta .btn-primary:active {
            transform: scale(0.97);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
        }

        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: #E7F0FF;
            border-radius: 2px;
            transition: transform var(--transition), opacity var(--transition);
        }

        /* Hero Section */
        .hero {
            position: relative;
            background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-deep) 100%);
            padding: 96px 0 80px;
            overflow: hidden;
            min-height: 680px;
            display: flex;
            align-items: center;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: url('/assets/images/cfd88f5d9e60408c.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            pointer-events: none;
        }

        .hero::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(27,42,74,0.8) 0%, transparent 70%);
            pointer-events: none;
        }

        .hero .container {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 420px;
            gap: 48px;
            align-items: center;
        }

        .hero-content {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(53,200,240,0.12);
            border: 1px solid rgba(53,200,240,0.25);
            color: var(--accent-cyan);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            width: fit-content;
        }

        .hero-tag .dot {
            width: 8px;
            height: 8px;
            background: var(--accent-green);
            border-radius: 50%;
            animation: pulse-dot 1.8s ease-in-out infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { box-shadow: 0 0 0 0 rgba(125,255,110,0.5); }
            50% { box-shadow: 0 0 0 8px rgba(125,255,110,0); }
        }

        .hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.25;
            color: #fff;
            letter-spacing: -0.5px;
            text-shadow: 0 2px 16px rgba(0,0,0,0.4);
        }

        .hero h1 .highlight {
            color: var(--accent-cyan);
            position: relative;
        }

        .hero-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 620px;
            line-height: 1.8;
        }

        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-top: 8px;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 14px 32px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1rem;
            box-shadow: 0 0 28px rgba(53,200,240,0.4);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 48px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            letter-spacing: 0.5px;
            text-align: center;
        }

        .btn-primary:hover {
            box-shadow: 0 0 42px rgba(53,200,240,0.6);
            transform: translateY(-2px);
            color: #0A0F1E;
        }

        .btn-primary:active {
            transform: scale(0.97);
        }

        .btn-secondary {
            background: transparent;
            color: var(--accent-cyan);
            padding: 14px 32px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 1rem;
            border: 1px solid var(--accent-cyan);
            box-shadow: 0 0 12px rgba(53,200,240,0.15);
            transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
            min-height: 48px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            letter-spacing: 0.5px;
            text-align: center;
        }

        .btn-secondary:hover {
            background: rgba(53,200,240,0.12);
            box-shadow: 0 0 20px rgba(53,200,240,0.3);
            transform: translateY(-2px);
            color: var(--accent-cyan);
        }

        .btn-secondary:active {
            transform: scale(0.97);
        }

        .hero-data-strip {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
            margin-top: 4px;
        }

        .hero-data-item {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .hero-data-item .number {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--accent-green);
            font-variant-numeric: tabular-nums;
        }

        .hero-data-item .label {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Hero right visual - short video vertical feel */
        .hero-visual {
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .hero-visual .phone-frame {
            width: 340px;
            max-width: 100%;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 28px;
            padding: 20px 16px;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: 0 24px 64px rgba(0,0,0,0.5), 0 0 40px rgba(53,200,240,0.1);
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .phone-frame .phone-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 4px 12px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }

        .phone-frame .phone-title {
            font-size: 0.9rem;
            font-weight: 700;
            color: #fff;
        }

        .phone-frame .phone-badge {
            font-size: 0.7rem;
            color: var(--accent-green);
            background: rgba(125,255,110,0.1);
            padding: 3px 10px;
            border-radius: 12px;
            font-weight: 600;
        }

        .phone-frame .match-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: rgba(255,255,255,0.04);
            padding: 12px 14px;
            border-radius: 10px;
            border: 1px solid rgba(255,255,255,0.06);
            transition: background var(--transition);
        }

        .phone-frame .match-row:hover {
            background: rgba(255,255,255,0.08);
        }

        .phone-frame .team {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-main);
        }

        .phone-frame .score {
            font-size: 1.1rem;
            font-weight: 800;
            color: #fff;
            font-variant-numeric: tabular-nums;
            min-width: 48px;
            text-align: center;
        }

        .phone-frame .live-tag {
            font-size: 0.65rem;
            color: #fff;
            background: #E44B4B;
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: 700;
            text-transform: uppercase;
        }

        .phone-frame .data-bar {
            display: flex;
            gap: 6px;
            align-items: center;
        }

        .phone-frame .data-bar .bar {
            flex: 1;
            height: 4px;
            background: rgba(255,255,255,0.1);
            border-radius: 2px;
            overflow: hidden;
        }

        .phone-frame .data-bar .bar-fill {
            height: 100%;
            border-radius: 2px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-green));
        }

        .phone-frame .trend-row {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

        .phone-frame .trend-chip {
            font-size: 0.7rem;
            padding: 4px 10px;
            background: rgba(53,200,240,0.08);
            border: 1px solid rgba(53,200,240,0.2);
            color: var(--accent-cyan);
            border-radius: 6px;
            font-weight: 500;
        }

        /* Common sections */
        .section {
            padding: var(--section-gap) 0;
            position: relative;
        }

        .section-alt {
            background: rgba(255,255,255,0.02);
            border-top: 1px solid rgba(255,255,255,0.05);
            border-bottom: 1px solid rgba(255,255,255,0.05);
        }

        .section-header {
            margin-bottom: 40px;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .section-header .section-tag {
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--accent-cyan);
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .section-header h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.35;
            letter-spacing: -0.3px;
        }

        .section-header .section-desc {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 700px;
            line-height: 1.8;
        }

        /* Card system */
        .card-grid {
            display: grid;
            gap: var(--card-gap);
        }

        .card-grid-3 {
            grid-template-columns: repeat(3, 1fr);
        }

        .card-grid-2 {
            grid-template-columns: repeat(2, 1fr);
        }

        .card-grid-4 {
            grid-template-columns: repeat(4, 1fr);
        }

        .glass-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            padding: var(--card-padding);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--card-shadow);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
        }

        .glass-card:hover {
            transform: translateY(-4px);
            border-color: rgba(53,200,240,0.4);
            box-shadow: var(--card-shadow-hover);
            background: var(--card-bg-hover);
        }

        .glass-card .card-icon {
            width: 44px;
            height: 44px;
            background: rgba(53,200,240,0.1);
            border: 1px solid rgba(53,200,240,0.2);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 16px;
            color: var(--accent-cyan);
        }

        .glass-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .glass-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .glass-card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent-cyan);
            margin-top: 12px;
            transition: color var(--transition);
        }

        .glass-card .card-link:hover {
            color: var(--accent-green);
        }

        /* Data table for speed overview */
        .data-table-wrap {
            overflow-x: auto;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--card-shadow);
            padding: 8px;
        }

        .data-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 720px;
        }

        .data-table th {
            text-align: left;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            padding: 14px 16px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }

        .data-table td {
            padding: 14px 16px;
            font-size: 0.9rem;
            color: var(--text-main);
            border-bottom: 1px solid rgba(255,255,255,0.04);
            font-variant-numeric: tabular-nums;
        }

        .data-table tr:last-child td {
            border-bottom: none;
        }

        .data-table td .trend-up {
            color: var(--accent-green);
            font-weight: 600;
        }

        .data-table td .trend-down {
            color: #E44B4B;
            font-weight: 600;
        }

        .data-table td .tag-live {
            background: rgba(228,75,75,0.15);
            color: #E44B4B;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.7rem;
            font-weight: 700;
        }

        .data-table td .tag-done {
            background: rgba(255,255,255,0.06);
            color: var(--text-muted);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.7rem;
            font-weight: 600;
        }

        /* Screenshot / demo area */
        .screenshot-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--card-gap);
        }

        .screenshot-card {
            position: relative;
            border-radius: var(--card-radius);
            overflow: hidden;
            border: 1px solid var(--card-border);
            box-shadow: var(--card-shadow);
            background: var(--card-bg);
        }

        .screenshot-card img {
            width: 100%;
            height: 260px;
            object-fit: cover;
            border-radius: 0;
            transition: transform var(--transition);
        }

        .screenshot-card:hover img {
            transform: scale(1.03);
        }

        .screenshot-card .sc-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 16px 20px;
            background: linear-gradient(transparent, rgba(10,15,30,0.9));
            font-size: 0.9rem;
            font-weight: 600;
            color: #fff;
        }

        /* Cases */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }

        .case-stat {
            display: flex;
            align-items: baseline;
            gap: 6px;
            margin-bottom: 4px;
        }

        .case-stat .value {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent-green);
            font-variant-numeric: tabular-nums;
        }

        .case-stat .unit {
            font-size: 0.85rem;
            color: var(--text-secondary);
        }

        /* Pricing */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
            align-items: stretch;
        }

        .pricing-card {
            position: relative;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            padding: 32px 24px;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--card-shadow);
            display: flex;
            flex-direction: column;
            gap: 16px;
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
        }

        .pricing-card:hover {
            transform: translateY(-4px);
            border-color: rgba(53,200,240,0.4);
            box-shadow: var(--card-shadow-hover);
        }

        .pricing-card.featured {
            border-color: rgba(244,185,86,0.4);
            box-shadow: 0 12px 48px rgba(244,185,86,0.15);
        }

        .pricing-card .badge {
            position: absolute;
            top: -10px;
            right: 20px;
            background: var(--accent-gold);
            color: #0A0F1E;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.7rem;
            font-weight: 800;
            letter-spacing: 0.5px;
        }

        .pricing-card .plan-name {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
        }

        .pricing-card .plan-price {
            font-size: 2.4rem;
            font-weight: 800;
            color: #fff;
            font-variant-numeric: tabular-nums;
        }

        .pricing-card .plan-price .currency {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--text-secondary);
        }

        .pricing-card .plan-price .period {
            font-size: 0.85rem;
            font-weight: 400;
            color: var(--text-muted);
        }

        .pricing-card .plan-features {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
            flex: 1;
        }

        .pricing-card .plan-features li {
            font-size: 0.85rem;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .pricing-card .plan-features li::before {
            content: '✓';
            color: var(--accent-green);
            font-weight: 700;
            font-size: 0.8rem;
        }

        .pricing-card .btn-primary,
        .pricing-card .btn-secondary {
            width: 100%;
        }

        /* Reviews */
        .review-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        .review-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 12px;
            padding: 16px;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--card-shadow);
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .review-card .review-header {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .review-card .avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--brand-blue), var(--accent-cyan));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            font-weight: 700;
            color: #fff;
            flex-shrink: 0;
        }

        .review-card .review-name {
            font-size: 0.85rem;
            font-weight: 600;
            color: #fff;
        }

        .review-card .review-stars {
            font-size: 0.75rem;
            color: var(--accent-gold);
            letter-spacing: 2px;
        }

        .review-card .review-text {
            font-size: 0.8rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Reputation */
        .reputation-strip {
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
        }

        .reputation-item {
            text-align: center;
            display: flex;
            flex-direction: column;
            gap: 4px;
            min-width: 120px;
        }

        .reputation-item .rep-value {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-cyan);
        }

        .reputation-item .rep-label {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Brand intro */
        .brand-intro {
            max-width: 800px;
            font-size: 0.95rem;
            line-height: 2;
            color: var(--text-secondary);
        }

        /* Special topics */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }

        .topic-card {
            position: relative;
            border-radius: var(--card-radius);
            overflow: hidden;
            border: 1px solid var(--card-border);
            box-shadow: var(--card-shadow);
            min-height: 200px;
            display: flex;
            align-items: flex-end;
            background: var(--card-bg);
        }

        .topic-card img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
            opacity: 0.5;
            transition: opacity var(--transition), transform var(--transition);
        }

        .topic-card:hover img {
            opacity: 0.7;
            transform: scale(1.04);
        }

        .topic-card .topic-overlay {
            position: relative;
            z-index: 2;
            padding: 20px;
            width: 100%;
            background: linear-gradient(transparent, rgba(10,15,30,0.92));
        }

        .topic-card .topic-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 4px;
        }

        .topic-card .topic-sub {
            font-size: 0.8rem;
            color: var(--text-secondary);
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 800px;
        }

        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 12px;
            overflow: hidden;
            transition: border-color var(--transition);
        }

        .faq-item:hover {
            border-color: rgba(53,200,240,0.3);
        }

        .faq-question {
            width: 100%;
            padding: 18px 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            cursor: pointer;
            background: none;
            border: none;
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            text-align: left;
        }

        .faq-question .faq-icon {
            font-size: 1.2rem;
            color: var(--accent-cyan);
            transition: transform var(--transition);
            flex-shrink: 0;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 300ms ease;
        }

        .faq-answer-inner {
            padding: 0 20px 18px;
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
        }

        /* News list */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .news-item {
            display: flex;
            gap: 16px;
            align-items: center;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 12px;
            padding: 16px;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--card-shadow);
            transition: transform var(--transition), border-color var(--transition);
        }

        .news-item:hover {
            transform: translateY(-2px);
            border-color: rgba(53,200,240,0.35);
        }

        .news-item img {
            width: 100px;
            height: 68px;
            object-fit: cover;
            border-radius: 8px;
            flex-shrink: 0;
        }

        .news-item .news-content {
            display: flex;
            flex-direction: column;
            gap: 4px;
            flex: 1;
        }

        .news-item .news-title {
            font-size: 0.95rem;
            font-weight: 700;
            color: #fff;
            line-height: 1.4;
        }

        .news-item .news-meta {
            font-size: 0.75rem;
            color: var(--text-muted);
            display: flex;
            gap: 12px;
        }

        /* Partners / Data sources */
        .partner-strip {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
        }

        .partner-badge {
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--text-muted);
            padding: 8px 18px;
            background: rgba(255,255,255,0.03);
            border: 1px solid rgba(255,255,255,0.06);
            border-radius: 20px;
            white-space: nowrap;
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, var(--brand-blue-light), var(--brand-blue), var(--bg-deep));
            padding: 80px 0;
            border-radius: 24px;
            margin: 0 0 32px;
            position: relative;
            overflow: hidden;
            text-align: center;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(ellipse at center, rgba(53,200,240,0.1), transparent 60%);
            pointer-events: none;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 20px;
            max-width: 700px;
        }

        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
        }

        .cta-section p {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 560px;
        }

        /* Footer */
        .site-footer {
            background: var(--bg-deep);
            border-top: 1px solid rgba(255,255,255,0.06);
            padding: 48px 0 28px;
            margin-top: 0;
        }

        .footer-container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-direction: column;
            gap: 32px;
        }

        .footer-top {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            justify-content: space-between;
            align-items: flex-start;
        }

        .footer-brand {
            display: flex;
            flex-direction: column;
            gap: 8px;
            max-width: 300px;
        }

        .footer-brand .footer-logo {
            font-size: 1.4rem;
            font-weight: 800;
            color: #E7F0FF;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-brand p {
            font-size: 0.8rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
        }

        .footer-col {
            display: flex;
            flex-direction: column;
            gap: 8px;
            min-width: 120px;
        }

        .footer-col h4 {
            font-size: 0.85rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 4px;
            letter-spacing: 0.5px;
        }

        .footer-col a {
            font-size: 0.8rem;
            color: var(--text-muted);
            transition: color var(--transition);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.05);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: space-between;
            align-items: center;
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        .footer-bottom a {
            color: var(--text-muted);
            font-size: 0.75rem;
            transition: color var(--transition);
        }

        .footer-bottom a:hover {
            color: var(--accent-cyan);
        }

        /* Mobile responsiveness */
        @media (max-width: 1024px) {
            .hero .container {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .hero-visual {
                order: 2;
            }

            .hero {
                padding: 64px 0 56px;
                min-height: auto;
            }

            .hero h1 {
                font-size: 2.2rem;
            }

            .card-grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }

            .review-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .pricing-grid {
                grid-template-columns: 1fr;
                max-width: 500px;
                margin: 0 auto;
            }

            .case-grid {
                grid-template-columns: 1fr;
                max-width: 600px;
                margin: 0 auto;
            }

            .topic-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .screenshot-grid {
                grid-template-columns: 1fr;
            }

            .section {
                padding: 64px 0;
            }

            :root {
                --section-gap: 64px;
            }
        }

        @media (max-width: 768px) {
            .nav-container {
                min-height: 60px;
                gap: 12px;
                flex-wrap: wrap;
                padding: 8px 16px;
            }

            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 2px;
                background: rgba(10,15,30,0.95);
                border-radius: 12px;
                padding: 8px;
                position: absolute;
                top: 60px;
                left: 16px;
                right: 16px;
                z-index: 99;
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                border: 1px solid var(--card-border);
                box-shadow: 0 16px 48px rgba(0,0,0,0.6);
            }

            .nav-menu.open {
                display: flex;
            }

            .nav-menu li a {
                padding: 12px 16px;
                font-size: 0.95rem;
            }

            .nav-toggle {
                display: flex;
            }

            .nav-cta {
                margin-left: auto;
            }

            .nav-cta .btn-primary {
                padding: 8px 16px;
                font-size: 0.8rem;
                min-height: 36px;
            }

            .hero {
                padding: 48px 0 40px;
            }

            .hero h1 {
                font-size: 1.8rem;
            }

            .hero-subtitle {
                font-size: 0.95rem;
            }

            .hero-actions {
                flex-direction: column;
                gap: 12px;
            }

            .btn-primary, .btn-secondary {
                width: 100%;
                min-height: 48px;
                padding: 12px 20px;
                font-size: 0.95rem;
            }

            .card-grid-3,
            .card-grid-2,
            .card-grid-4 {
                grid-template-columns: 1fr;
            }

            .review-grid {
                grid-template-columns: 1fr;
            }

            .topic-grid {
                grid-template-columns: 1fr;
            }

            .screenshot-grid {
                grid-template-columns: 1fr;
            }

            .section {
                padding: 48px 0;
            }

            :root {
                --section-gap: 48px;
                --card-gap: 16px;
            }

            .section-header h2 {
                font-size: 1.5rem;
            }

            .reputation-strip {
                gap: 16px;
                justify-content: center;
            }

            .reputation-item {
                min-width: 100px;
            }

            .reputation-item .rep-value {
                font-size: 1.5rem;
            }

            .footer-top {
                flex-direction: column;
                gap: 24px;
            }

            .footer-links {
                gap: 24px;
                flex-wrap: wrap;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
                text-align: left;
            }

            .news-item {
                flex-direction: column;
                align-items: flex-start;
            }

            .news-item img {
                width: 100%;
                height: 140px;
                object-fit: cover;
            }

            .phone-frame {
                width: 100%;
                max-width: 320px;
            }

            .data-table-wrap {
                padding: 4px;
            }

            .data-table th,
            .data-table td {
                padding: 10px 12px;
                font-size: 0.8rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .nav-container {
                padding: 8px 12px;
            }

            .nav-menu {
                left: 12px;
                right: 12px;
            }

            .hero h1 {
                font-size: 1.5rem;
            }

            .hero-tag {
                font-size: 0.75rem;
                padding: 4px 12px;
            }

            .hero-data-strip {
                gap: 12px;
            }

            .hero-data-item .number {
                font-size: 1.2rem;
            }

            .glass-card {
                padding: 18px;
            }

            .section-header h2 {
                font-size: 1.3rem;
            }

            .pricing-card {
                padding: 24px 18px;
            }

            .cta-section {
                padding: 48px 20px;
                border-radius: 16px;
            }

            .cta-section h2 {
                font-size: 1.6rem;
            }
        }

/* roulang page: category2 */
:root {
            --bg-deep: #0A0F1E;
            --bg-dark: #0D1428;
            --brand-blue: #1B2A4A;
            --brand-blue-light: #14335C;
            --accent-cyan: #35C8F0;
            --accent-green: #7DFF6E;
            --accent-gold: #F4B956;
            --text-main: #D8E2F0;
            --text-secondary: #8DA3C7;
            --text-muted: #5C6F8F;
            --card-bg: rgba(255,255,255,0.05);
            --card-bg-hover: rgba(255,255,255,0.10);
            --card-border: rgba(255,255,255,0.12);
            --card-radius: 16px;
            --card-radius-sm: 8px;
            --card-padding: 24px;
            --card-shadow: 0 8px 32px rgba(0,0,0,0.35);
            --card-shadow-hover: 0 12px 40px rgba(0,0,0,0.45);
            --transition: 220ms ease;
            --container-width: 1200px;
            --section-gap: 96px;
            --card-gap: 24px;
            --font-main: 'PingFang SC','Microsoft YaHei','Inter','Roboto Condensed',sans-serif;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: var(--font-main);
            background-color: var(--bg-deep);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--card-radius-sm);
        }
        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent-green);
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        input:focus, select:focus, textarea:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .visually-hidden {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            white-space: nowrap;
            border: 0;
        }
        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: linear-gradient(135deg, var(--brand-blue) 0%, var(--bg-deep) 80%);
            border-bottom: 1px solid rgba(255,255,255,0.08);
            box-shadow: 0 4px 20px rgba(0,0,0,0.3);
        }
        .nav-container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            gap: 24px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .nav-logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #E7F0FF;
            font-weight: 700;
            font-size: 1.4rem;
            letter-spacing: 0.5px;
            transition: opacity var(--transition);
        }
        .nav-logo a:hover {
            color: #E7F0FF;
            opacity: 0.85;
        }
        .nav-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--brand-blue-light));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            font-weight: 800;
            box-shadow: 0 0 16px rgba(53,200,240,0.4);
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            flex-wrap: wrap;
            margin: 0;
            padding: 0;
        }
        .nav-menu li a {
            display: block;
            padding: 8px 14px;
            color: #E7F0FF;
            font-size: 0.92rem;
            font-weight: 500;
            border-radius: 6px;
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }
        .nav-menu li a:hover,
        .nav-menu li a.active {
            background: rgba(255,255,255,0.12);
            color: #fff;
        }
        .nav-menu li a.active {
            box-shadow: inset 0 -2px 0 var(--accent-cyan);
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .nav-cta .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 10px 22px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 0 0 20px rgba(53,200,240,0.35);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            white-space: nowrap;
        }
        .nav-cta .btn-primary:hover {
            box-shadow: 0 0 32px rgba(53,200,240,0.55);
            transform: translateY(-1px);
            color: #0A0F1E;
        }
        .nav-cta .btn-primary:active {
            transform: scale(0.97);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: #E7F0FF;
            border-radius: 2px;
            transition: transform var(--transition), opacity var(--transition);
        }
        /* Category Hero */
        .category-hero {
            background: linear-gradient(135deg, var(--brand-blue) 0%, var(--bg-deep) 90%);
            padding: 56px 24px 48px;
            position: relative;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            overflow: hidden;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 55%;
            height: 100%;
            background-image: url('/assets/images/e20a06972c42a39a.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.12;
            pointer-events: none;
            mask-image: linear-gradient(to left, rgba(0,0,0,0.8), transparent);
            -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,0.8), transparent);
        }
        .category-hero .container {
            position: relative;
            z-index: 1;
        }
        .category-hero h1 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
            line-height: 1.3;
        }
        .category-hero .hero-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin-bottom: 24px;
            line-height: 1.8;
        }
        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            align-items: center;
            margin-top: 8px;
        }
        .filter-select {
            background: rgba(255,255,255,0.08);
            border: 1px solid rgba(255,255,255,0.15);
            border-radius: 8px;
            padding: 10px 16px;
            color: var(--text-main);
            font-size: 0.9rem;
            min-width: 160px;
            cursor: pointer;
            appearance: none;
            -webkit-appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238DA3C7' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 12px center;
            transition: border-color var(--transition), background-color var(--transition);
        }
        .filter-select:hover {
            border-color: rgba(53,200,240,0.5);
            background-color: rgba(255,255,255,0.12);
        }
        .filter-select option {
            background-color: var(--bg-dark);
            color: var(--text-main);
        }
        .filter-search {
            flex: 1;
            min-width: 200px;
            max-width: 340px;
            position: relative;
        }
        .filter-search input {
            width: 100%;
            background: rgba(255,255,255,0.08);
            border: 1px solid rgba(255,255,255,0.15);
            border-radius: 8px;
            padding: 10px 40px 10px 16px;
            color: var(--text-main);
            font-size: 0.9rem;
            transition: border-color var(--transition), background-color var(--transition);
        }
        .filter-search input::placeholder {
            color: var(--text-muted);
        }
        .filter-search input:focus {
            border-color: var(--accent-cyan);
            background-color: rgba(255,255,255,0.12);
        }
        .filter-search .search-icon {
            position: absolute;
            right: 14px;
            top: 50%;
            transform: translateY(-50%);
            width: 18px;
            height: 18px;
            color: var(--text-muted);
            pointer-events: none;
        }
        .filter-search .search-icon svg {
            width: 100%;
            height: 100%;
            fill: none;
            stroke: currentColor;
            stroke-width: 2;
            stroke-linecap: round;
        }
        /* Section Base */
        .section {
            padding: var(--section-gap) 24px;
        }
        .section-alt {
            background: var(--bg-dark);
        }
        .section-header {
            max-width: 720px;
            margin-bottom: 40px;
        }
        .section-header .section-tag {
            display: inline-block;
            background: rgba(53,200,240,0.12);
            border: 1px solid rgba(53,200,240,0.3);
            color: var(--accent-cyan);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: 12px;
            letter-spacing: 1px;
        }
        .section-header h2 {
            font-size: 1.8rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.4;
            margin-bottom: 12px;
        }
        .section-header p {
            color: var(--text-secondary);
            font-size: 1rem;
            line-height: 1.8;
        }
        /* Guide Cards Grid */
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }
        .guide-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            padding: var(--card-padding);
            box-shadow: var(--card-shadow);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
            display: flex;
            flex-direction: column;
            gap: 14px;
            position: relative;
            overflow: hidden;
        }
        .guide-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
            opacity: 0;
            transition: opacity var(--transition);
        }
        .guide-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--card-shadow-hover);
            border-color: rgba(53,200,240,0.45);
            background-color: var(--card-bg-hover);
        }
        .guide-card:hover::before {
            opacity: 1;
        }
        .guide-card .card-img {
            width: 100%;
            aspect-ratio: 16/9;
            border-radius: var(--card-radius-sm);
            overflow: hidden;
            position: relative;
            margin-bottom: 2px;
        }
        .guide-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--card-radius-sm);
            transition: transform var(--transition);
        }
        .guide-card:hover .card-img img {
            transform: scale(1.03);
        }
        .guide-card .card-img .card-tag {
            position: absolute;
            top: 10px;
            left: 10px;
            background: rgba(10,15,30,0.82);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid rgba(255,255,255,0.15);
            border-radius: 6px;
            padding: 4px 10px;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--accent-cyan);
            letter-spacing: 0.5px;
        }
        .guide-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: #fff;
            line-height: 1.6;
            margin: 0;
        }
        .guide-card h3 a {
            color: #fff;
            transition: color var(--transition);
        }
        .guide-card h3 a:hover {
            color: var(--accent-cyan);
        }
        .guide-card .card-excerpt {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.75;
            flex: 1;
            margin: 0;
        }
        .guide-card .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.78rem;
            color: var(--text-muted);
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 12px;
        }
        .guide-card .card-meta span {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        /* Hot Rank */
        .hot-rank-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--card-gap);
            align-items: start;
        }
        .rank-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0;
        }
        .rank-list li {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 16px 20px;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius-sm);
            margin-bottom: 12px;
            transition: border-color var(--transition), background-color var(--transition), transform var(--transition);
        }
        .rank-list li:hover {
            border-color: rgba(53,200,240,0.4);
            background-color: var(--card-bg-hover);
            transform: translateX(4px);
        }
        .rank-num {
            flex-shrink: 0;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(53,200,240,0.2), rgba(20,51,92,0.6));
            border: 1px solid rgba(53,200,240,0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 0.95rem;
            color: var(--accent-cyan);
        }
        .rank-list li:nth-child(1) .rank-num {
            background: linear-gradient(135deg, var(--accent-gold), #c98b2d);
            color: #0A0F1E;
            border-color: var(--accent-gold);
        }
        .rank-list li:nth-child(2) .rank-num {
            background: linear-gradient(135deg, #c0c8d4, #8a94a8);
            color: #0A0F1E;
            border-color: #c0c8d4;
        }
        .rank-list li:nth-child(3) .rank-num {
            background: linear-gradient(135deg, #d08a5a, #a85c2e);
            color: #fff;
            border-color: #d08a5a;
        }
        .rank-info h4 {
            font-size: 0.98rem;
            font-weight: 600;
            color: #fff;
            line-height: 1.5;
            margin: 0 0 2px;
        }
        .rank-info p {
            font-size: 0.8rem;
            color: var(--text-secondary);
            margin: 0;
        }
        .rank-stats {
            margin-left: auto;
            text-align: right;
            flex-shrink: 0;
        }
        .rank-stats .stat-num {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--accent-green);
            display: block;
            line-height: 1.2;
        }
        .rank-stats .stat-label {
            font-size: 0.72rem;
            color: var(--text-muted);
        }
        /* Tag Cloud */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .tag-cloud .tag {
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.12);
            border-radius: 20px;
            padding: 8px 18px;
            font-size: 0.88rem;
            color: var(--text-secondary);
            cursor: pointer;
            transition: all var(--transition);
            font-weight: 500;
        }
        .tag-cloud .tag:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background: rgba(53,200,240,0.08);
            box-shadow: 0 0 16px rgba(53,200,240,0.15);
        }
        .tag-cloud .tag.active {
            border-color: var(--accent-cyan);
            color: #fff;
            background: rgba(53,200,240,0.18);
            box-shadow: 0 0 20px rgba(53,200,240,0.25);
        }
        /* Topic Cards */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }
        .topic-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            overflow: hidden;
            box-shadow: var(--card-shadow);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            cursor: pointer;
        }
        .topic-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--card-shadow-hover);
            border-color: rgba(53,200,240,0.45);
        }
        .topic-card .topic-img {
            width: 100%;
            aspect-ratio: 16/8;
            overflow: hidden;
        }
        .topic-card .topic-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
            transition: transform var(--transition);
        }
        .topic-card:hover .topic-img img {
            transform: scale(1.04);
        }
        .topic-card .topic-body {
            padding: 20px 24px 24px;
        }
        .topic-card .topic-body .topic-tag {
            font-size: 0.72rem;
            font-weight: 600;
            color: var(--accent-cyan);
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 8px;
            display: block;
        }
        .topic-card .topic-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            margin: 0 0 8px;
            line-height: 1.5;
        }
        .topic-card .topic-body p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.7;
        }
        /* Tools */
        .tools-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--card-gap);
        }
        .tool-item {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            padding: 28px 20px;
            text-align: center;
            box-shadow: var(--card-shadow);
            transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
        }
        .tool-item:hover {
            transform: translateY(-4px);
            border-color: rgba(53,200,240,0.45);
            box-shadow: var(--card-shadow-hover);
        }
        .tool-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            background: linear-gradient(135deg, rgba(53,200,240,0.18), rgba(20,51,92,0.5));
            border: 1px solid rgba(53,200,240,0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
            font-size: 1.5rem;
            color: var(--accent-cyan);
        }
        .tool-item h3 {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            margin: 0 0 8px;
        }
        .tool-item p {
            font-size: 0.82rem;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.6;
        }
        /* Subscribe */
        .subscribe-panel {
            background: linear-gradient(135deg, var(--brand-blue) 0%, var(--bg-deep) 100%);
            border: 1px solid rgba(53,200,240,0.2);
            border-radius: var(--card-radius);
            padding: 48px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 32px;
            box-shadow: 0 8px 40px rgba(0,0,0,0.4);
            position: relative;
            overflow: hidden;
        }
        .subscribe-panel::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 380px;
            height: 380px;
            border-radius: 50%;
            background: rgba(53,200,240,0.08);
            filter: blur(40px);
            pointer-events: none;
        }
        .subscribe-info {
            flex: 1;
            min-width: 260px;
            position: relative;
            z-index: 1;
        }
        .subscribe-info h2 {
            font-size: 1.5rem;
            font-weight: 800;
            color: #fff;
            margin: 0 0 8px;
        }
        .subscribe-info p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            margin: 0;
            line-height: 1.7;
        }
        .subscribe-form {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            align-items: center;
            position: relative;
            z-index: 1;
        }
        .subscribe-form input {
            background: rgba(255,255,255,0.08);
            border: 1px solid rgba(255,255,255,0.15);
            border-radius: 8px;
            padding: 12px 16px;
            color: var(--text-main);
            font-size: 0.9rem;
            min-width: 240px;
            transition: border-color var(--transition), background-color var(--transition);
        }
        .subscribe-form input::placeholder {
            color: var(--text-muted);
        }
        .subscribe-form input:focus {
            border-color: var(--accent-cyan);
            background-color: rgba(255,255,255,0.12);
        }
        .subscribe-form .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 12px 28px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 0 0 24px rgba(53,200,240,0.35);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 48px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }
        .subscribe-form .btn-primary:hover {
            box-shadow: 0 0 40px rgba(53,200,240,0.55);
            transform: translateY(-1px);
        }
        .subscribe-form .btn-primary:active {
            transform: scale(0.97);
        }
        .form-status {
            width: 100%;
            font-size: 0.85rem;
            padding: 8px 12px;
            border-radius: 6px;
            display: none;
            position: relative;
            z-index: 1;
        }
        .form-status.success {
            display: block;
            background: rgba(125,255,110,0.1);
            border: 1px solid rgba(125,255,110,0.3);
            color: var(--accent-green);
        }
        .form-status.error {
            display: block;
            background: rgba(244,185,86,0.1);
            border: 1px solid rgba(244,185,86,0.3);
            color: var(--accent-gold);
        }
        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 820px;
        }
        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius-sm);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(53,200,240,0.35);
        }
        .faq-item.open {
            border-color: rgba(53,200,240,0.5);
            box-shadow: 0 4px 24px rgba(53,200,240,0.08);
        }
        .faq-question {
            width: 100%;
            padding: 18px 22px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            color: var(--text-main);
            font-size: 0.98rem;
            font-weight: 700;
            cursor: pointer;
            transition: color var(--transition);
            text-align: left;
            line-height: 1.6;
        }
        .faq-question:hover {
            color: var(--accent-cyan);
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            border: 1px solid rgba(255,255,255,0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: var(--accent-cyan);
            transition: transform var(--transition), border-color var(--transition);
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(45deg);
            border-color: var(--accent-cyan);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition), padding var(--transition);
            padding: 0 22px;
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
            padding: 0 22px 20px;
        }
        /* Bottom CTA */
        .bottom-cta {
            background: linear-gradient(135deg, var(--brand-blue) 0%, var(--bg-deep) 100%);
            border-top: 1px solid rgba(255,255,255,0.08);
            padding: 72px 24px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .bottom-cta::before {
            content: '';
            position: absolute;
            top: -60%;
            left: 50%;
            transform: translateX(-50%);
            width: 700px;
            height: 700px;
            border-radius: 50%;
            background: rgba(53,200,240,0.06);
            filter: blur(60px);
            pointer-events: none;
        }
        .bottom-cta .container {
            position: relative;
            z-index: 1;
        }
        .bottom-cta h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            margin: 0 0 16px;
            line-height: 1.4;
        }
        .bottom-cta p {
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 580px;
            margin: 0 auto 32px;
            line-height: 1.8;
        }
        .bottom-cta .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 14px 32px;
            border-radius: 10px;
            font-weight: 700;
            font-size: 1rem;
            box-shadow: 0 0 28px rgba(53,200,240,0.35);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 50px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }
        .btn-primary:hover {
            box-shadow: 0 0 48px rgba(53,200,240,0.6);
            transform: translateY(-2px);
            color: #0A0F1E;
        }
        .btn-primary:active {
            transform: scale(0.97);
        }
        .btn-secondary {
            background: transparent;
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
            padding: 14px 32px;
            border-radius: 10px;
            font-weight: 700;
            font-size: 1rem;
            transition: background-color var(--transition), color var(--transition), box-shadow var(--transition);
            min-height: 50px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }
        .btn-secondary:hover {
            background: rgba(53,200,240,0.12);
            color: #fff;
            box-shadow: 0 0 20px rgba(53,200,240,0.15);
        }
        /* Footer */
        .site-footer {
            background: var(--bg-deep);
            border-top: 1px solid rgba(255,255,255,0.08);
            padding: 56px 24px 28px;
        }
        .footer-container {
            max-width: var(--container-width);
            margin: 0 auto;
        }
        .footer-top {
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 48px;
            margin-bottom: 36px;
        }
        .footer-brand .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
        }
        .footer-logo {
            font-size: 1.2rem;
            font-weight: 700;
            color: #E7F0FF;
        }
        .footer-brand p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 320px;
            margin: 0;
        }
        .footer-links {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.9rem;
            font-weight: 700;
            margin: 0 0 14px;
        }
        .footer-col a {
            display: block;
            color: var(--text-secondary);
            font-size: 0.85rem;
            margin-bottom: 8px;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent-cyan);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px 20px;
            font-size: 0.78rem;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .footer-bottom a:hover {
            color: var(--accent-cyan);
        }
        /* Responsive */
        @media (max-width: 1024px) {
            :root {
                --section-gap: 64px;
            }
            .guide-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .topic-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .tools-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .hot-rank-wrap {
                grid-template-columns: 1fr;
            }
            .footer-top {
                grid-template-columns: 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 768px) {
            :root {
                --section-gap: 48px;
                --card-gap: 16px;
            }
            .nav-container {
                flex-wrap: wrap;
                padding: 12px 16px;
                min-height: 60px;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                background: rgba(10,15,30,0.96);
                border-radius: 12px;
                padding: 8px;
                margin-top: 4px;
                position: absolute;
                top: 60px;
                left: 16px;
                right: 16px;
                box-shadow: 0 16px 48px rgba(0,0,0,0.5);
                border: 1px solid rgba(255,255,255,0.08);
                backdrop-filter: blur(16px);
                -webkit-backdrop-filter: blur(16px);
            }
            .nav-menu.nav-open {
                display: flex;
            }
            .nav-menu li a {
                padding: 12px 16px;
                font-size: 1rem;
                border-radius: 8px;
            }
            .nav-cta {
                margin-left: auto;
            }
            .nav-cta .btn-primary {
                padding: 8px 16px;
                font-size: 0.82rem;
                min-height: 36px;
            }
            .category-hero {
                padding: 36px 16px 32px;
            }
            .category-hero h1 {
                font-size: 1.7rem;
            }
            .category-hero .hero-desc {
                font-size: 0.95rem;
            }
            .filter-bar {
                flex-direction: column;
                align-items: stretch;
                gap: 10px;
            }
            .filter-select {
                width: 100%;
                min-width: 0;
            }
            .filter-search {
                max-width: none;
                width: 100%;
            }
            .section {
                padding: var(--section-gap) 16px;
            }
            .guide-grid {
                grid-template-columns: 1fr;
            }
            .topic-grid {
                grid-template-columns: 1fr;
            }
            .tools-grid {
                grid-template-columns: 1fr 1fr;
            }
            .subscribe-panel {
                padding: 32px 20px;
                flex-direction: column;
                align-items: stretch;
            }
            .subscribe-form {
                flex-direction: column;
            }
            .subscribe-form input {
                min-width: 0;
                width: 100%;
            }
            .subscribe-form .btn-primary {
                width: 100%;
            }
            .bottom-cta {
                padding: 48px 16px;
            }
            .bottom-cta h2 {
                font-size: 1.5rem;
            }
            .bottom-cta .cta-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .btn-primary, .btn-secondary {
                width: 100%;
            }
            .footer-links {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }
        @media (max-width: 520px) {
            .tools-grid {
                grid-template-columns: 1fr;
            }
            .section-header h2 {
                font-size: 1.4rem;
            }
            .category-hero h1 {
                font-size: 1.4rem;
            }
            .rank-list li {
                flex-wrap: wrap;
                padding: 12px 14px;
                gap: 10px;
            }
            .rank-stats {
                margin-left: 0;
                text-align: left;
                width: 100%;
                padding-left: 52px;
            }
        }

/* roulang page: category1 */
:root {
            --bg-deep: #0A0F1E;
            --bg-dark: #0D1428;
            --brand-blue: #1B2A4A;
            --brand-blue-light: #14335C;
            --accent-cyan: #35C8F0;
            --accent-green: #7DFF6E;
            --accent-gold: #F4B956;
            --text-main: #D8E2F0;
            --text-secondary: #8DA3C7;
            --text-muted: #5C6F8F;
            --card-bg: rgba(255,255,255,0.05);
            --card-bg-hover: rgba(255,255,255,0.10);
            --card-border: rgba(255,255,255,0.12);
            --card-radius: 16px;
            --card-radius-sm: 8px;
            --card-padding: 24px;
            --card-shadow: 0 8px 32px rgba(0,0,0,0.35);
            --card-shadow-hover: 0 12px 40px rgba(0,0,0,0.45);
            --transition: 220ms ease;
            --container-width: 1200px;
            --section-gap: 96px;
            --card-gap: 24px;
            --font-main: 'PingFang SC','Microsoft YaHei','Inter','Roboto Condensed',sans-serif;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-main);
            background-color: var(--bg-deep);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--card-radius-sm);
        }

        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover {
            color: var(--accent-green);
        }

        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }

        button {
            cursor: pointer;
            background: none;
        }

        input:focus, select:focus, textarea:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: linear-gradient(135deg, var(--brand-blue) 0%, var(--bg-deep) 80%);
            border-bottom: 1px solid rgba(255,255,255,0.08);
            box-shadow: 0 4px 20px rgba(0,0,0,0.3);
        }

        .nav-container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            gap: 24px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .nav-logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #E7F0FF;
            font-weight: 700;
            font-size: 1.4rem;
            letter-spacing: 0.5px;
            transition: opacity var(--transition);
        }

        .nav-logo a:hover {
            color: #E7F0FF;
            opacity: 0.85;
        }

        .nav-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--brand-blue-light));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            font-weight: 800;
            box-shadow: 0 0 16px rgba(53,200,240,0.4);
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            flex-wrap: wrap;
        }

        .nav-menu li a {
            display: block;
            padding: 8px 14px;
            color: #E7F0FF;
            font-size: 0.92rem;
            font-weight: 500;
            border-radius: 6px;
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }

        .nav-menu li a:hover,
        .nav-menu li a.active {
            background: rgba(255,255,255,0.12);
            color: #fff;
        }

        .nav-menu li a.active {
            box-shadow: inset 0 -2px 0 var(--accent-cyan);
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .nav-cta .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 10px 22px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 0 0 20px rgba(53,200,240,0.35);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .nav-cta .btn-primary:hover {
            box-shadow: 0 0 32px rgba(53,200,240,0.55);
            transform: translateY(-1px);
        }

        .nav-cta .btn-primary:active {
            transform: scale(0.97);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
        }

        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: #E7F0FF;
            border-radius: 2px;
            transition: transform var(--transition), opacity var(--transition);
        }

        /* Category Hero (not full-height home hero) */
        .category-hero {
            background: linear-gradient(160deg, var(--brand-blue) 0%, var(--bg-deep) 75%);
            border-bottom: 1px solid rgba(255,255,255,0.07);
            padding: 56px 0 48px;
            position: relative;
            overflow: hidden;
        }

        .category-hero::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(53,200,240,0.16) 0%, transparent 70%);
            pointer-events: none;
        }

        .category-hero .container {
            position: relative;
            z-index: 1;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 18px;
        }

        .breadcrumb a {
            color: var(--text-secondary);
            transition: color var(--transition);
        }

        .breadcrumb a:hover {
            color: var(--accent-green);
        }

        .breadcrumb .sep {
            color: var(--text-muted);
        }

        .category-hero h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: 0.5px;
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .category-hero .hero-lead {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 760px;
            margin-bottom: 28px;
            line-height: 1.8;
        }

        .filter-search {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 14px;
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.12);
            border-radius: 12px;
            padding: 14px 18px;
            backdrop-filter: blur(10px);
            max-width: 820px;
        }

        .filter-search select,
        .filter-search input {
            background: rgba(10,15,30,0.7);
            border: 1px solid rgba(255,255,255,0.12);
            border-radius: 6px;
            color: var(--text-main);
            padding: 10px 14px;
            min-height: 40px;
            font-size: 0.9rem;
        }

        .filter-search select {
            min-width: 130px;
            cursor: pointer;
        }

        .filter-search input {
            flex: 1;
            min-width: 200px;
        }

        .filter-search .btn-search {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 10px 24px;
            border-radius: 6px;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 0 0 18px rgba(53,200,240,0.3);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 40px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .filter-search .btn-search:hover {
            box-shadow: 0 0 28px rgba(53,200,240,0.5);
            transform: translateY(-1px);
        }

        /* Section common */
        .section {
            padding: var(--section-gap) 0;
        }

        .section-alt {
            background: var(--bg-dark);
            border-top: 1px solid rgba(255,255,255,0.05);
            border-bottom: 1px solid rgba(255,255,255,0.05);
        }

        .section-title {
            font-size: 1.8rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: 0.3px;
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 650px;
            margin-bottom: 36px;
            line-height: 1.8;
        }

        .section-head {
            margin-bottom: 36px;
        }

        .section-head .section-title {
            margin-bottom: 8px;
        }

        /* Cards */
        .card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            padding: var(--card-padding);
            box-shadow: var(--card-shadow);
            backdrop-filter: blur(12px);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
        }

        .card:hover {
            transform: translateY(-4px);
            border-color: rgba(53,200,240,0.5);
            box-shadow: var(--card-shadow-hover);
            background: var(--card-bg-hover);
        }

        /* Data grid */
        .data-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }

        .data-card {
            display: flex;
            flex-direction: column;
            overflow: hidden;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            box-shadow: var(--card-shadow);
            backdrop-filter: blur(12px);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
        }

        .data-card:hover {
            transform: translateY(-4px);
            border-color: rgba(53,200,240,0.5);
            box-shadow: var(--card-shadow-hover);
            background: var(--card-bg-hover);
        }

        .data-card .card-cover {
            position: relative;
            aspect-ratio: 16/9;
            overflow: hidden;
        }

        .data-card .card-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
            transition: transform var(--transition);
        }

        .data-card:hover .card-cover img {
            transform: scale(1.04);
        }

        .data-card .card-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(10,15,30,0.8);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(53,200,240,0.4);
            color: var(--accent-cyan);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: 20px;
            letter-spacing: 0.5px;
        }

        .data-card .card-body {
            padding: 18px 20px 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .data-card .card-body h3 {
            font-size: 1.05rem;
            color: #fff;
            margin-bottom: 8px;
            line-height: 1.5;
            font-weight: 700;
        }

        .data-card .card-body p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 14px;
            flex: 1;
        }

        .data-card .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .data-card .card-meta .date {
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }

        .data-card .card-meta .views {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            color: var(--accent-cyan);
        }

        .view-more {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 32px;
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: 0.9rem;
            padding: 10px 20px;
            border: 1px solid rgba(53,200,240,0.4);
            border-radius: 8px;
            transition: background var(--transition), color var(--transition), border-color var(--transition);
        }

        .view-more:hover {
            background: rgba(53,200,240,0.12);
            color: var(--accent-green);
            border-color: var(--accent-cyan);
        }

        /* Ranking list */
        .ranking-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .ranking-item {
            display: flex;
            align-items: center;
            gap: 18px;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 12px;
            padding: 16px 20px;
            backdrop-filter: blur(10px);
            transition: transform var(--transition), border-color var(--transition), background var(--transition);
        }

        .ranking-item:hover {
            transform: translateX(4px);
            border-color: rgba(53,200,240,0.45);
            background: var(--card-bg-hover);
        }

        .ranking-item .rank {
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--text-muted);
            min-width: 36px;
            text-align: center;
        }

        .ranking-item .rank.top {
            color: var(--accent-gold);
        }

        .ranking-item .rank.alt {
            color: var(--accent-cyan);
        }

        .ranking-item .rank-info {
            flex: 1;
            min-width: 0;
        }

        .ranking-item .rank-info h4 {
            font-size: 0.98rem;
            color: #fff;
            margin-bottom: 3px;
            font-weight: 600;
        }

        .ranking-item .rank-info p {
            font-size: 0.82rem;
            color: var(--text-secondary);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .ranking-item .rank-value {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--accent-green);
            white-space: nowrap;
        }

        /* Dimension rows */
        .dimension-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .dimension-row {
            display: flex;
            align-items: center;
            gap: 20px;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 12px;
            padding: 18px 22px;
            backdrop-filter: blur(10px);
            transition: transform var(--transition), border-color var(--transition);
        }

        .dimension-row:hover {
            transform: translateX(4px);
            border-color: rgba(53,200,240,0.45);
        }

        .dimension-row .dim-icon {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(53,200,240,0.2), rgba(20,51,92,0.4));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--accent-cyan);
            flex-shrink: 0;
            border: 1px solid rgba(53,200,240,0.3);
        }

        .dimension-row .dim-info {
            flex: 1;
        }

        .dimension-row .dim-info h4 {
            font-size: 1rem;
            color: #fff;
            margin-bottom: 4px;
            font-weight: 600;
        }

        .dimension-row .dim-info p {
            font-size: 0.86rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Topic cards */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--card-gap);
        }

        .topic-card {
            position: relative;
            border-radius: var(--card-radius);
            overflow: hidden;
            min-height: 200px;
            display: flex;
            align-items: flex-end;
            background: var(--brand-blue);
            border: 1px solid var(--card-border);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
        }

        .topic-card:hover {
            transform: translateY(-4px);
            border-color: rgba(53,200,240,0.5);
            box-shadow: var(--card-shadow-hover);
        }

        .topic-card .topic-img {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.5;
            transition: opacity var(--transition);
        }

        .topic-card:hover .topic-img {
            opacity: 0.65;
        }

        .topic-card .topic-overlay {
            position: relative;
            z-index: 1;
            padding: 24px;
            background: linear-gradient(transparent, rgba(10,15,30,0.85));
            width: 100%;
        }

        .topic-card .topic-overlay h3 {
            font-size: 1.25rem;
            color: #fff;
            margin-bottom: 8px;
            font-weight: 700;
        }

        .topic-card .topic-overlay p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 12px;
        }

        .topic-card .topic-link {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: 0.85rem;
            transition: color var(--transition);
        }

        .topic-card .topic-link:hover {
            color: var(--accent-green);
        }

        /* Subscribe */
        .subscribe-panel {
            background: linear-gradient(135deg, var(--brand-blue) 0%, var(--bg-dark) 100%);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: var(--card-radius);
            padding: 40px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 24px;
            box-shadow: var(--card-shadow);
        }

        .subscribe-panel .sub-info {
            flex: 1;
            min-width: 260px;
        }

        .subscribe-panel .sub-info h3 {
            font-size: 1.4rem;
            color: #fff;
            margin-bottom: 8px;
            font-weight: 700;
        }

        .subscribe-panel .sub-info p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .subscribe-panel .sub-form {
            display: flex;
            gap: 10px;
            flex: 1;
            min-width: 260px;
        }

        .subscribe-panel .sub-form input {
            flex: 1;
            background: rgba(10,15,30,0.75);
            border: 1px solid rgba(255,255,255,0.12);
            border-radius: 8px;
            color: var(--text-main);
            padding: 12px 16px;
            min-height: 44px;
            font-size: 0.9rem;
        }

        .subscribe-panel .sub-form button {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 12px 24px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 0 0 20px rgba(53,200,240,0.35);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 44px;
            white-space: nowrap;
        }

        .subscribe-panel .sub-form button:hover {
            box-shadow: 0 0 32px rgba(53,200,240,0.55);
            transform: translateY(-1px);
        }

        /* CTA section */
        .cta-section {
            background: linear-gradient(135deg, var(--brand-blue-light) 0%, var(--bg-deep) 70%);
            border-radius: var(--card-radius);
            padding: 56px 40px;
            text-align: center;
            border: 1px solid rgba(53,200,240,0.25);
            box-shadow: 0 8px 40px rgba(0,0,0,0.4);
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -30%;
            left: -5%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(53,200,240,0.18) 0%, transparent 70%);
            pointer-events: none;
        }

        .cta-section h2 {
            font-size: 2rem;
            color: #fff;
            margin-bottom: 14px;
            font-weight: 800;
            letter-spacing: 0.3px;
        }

        .cta-section p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 28px;
            line-height: 1.8;
        }

        .cta-section .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 14px 32px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1rem;
            box-shadow: 0 0 28px rgba(53,200,240,0.45);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 48px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .cta-section .btn-primary:hover {
            box-shadow: 0 0 44px rgba(53,200,240,0.65);
            transform: translateY(-2px);
        }

        .cta-section .btn-primary:active {
            transform: scale(0.97);
        }

        /* Footer */
        .site-footer {
            background: var(--bg-dark);
            border-top: 1px solid rgba(255,255,255,0.07);
            padding: 48px 0 24px;
            margin-top: 0;
        }

        .footer-container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .footer-top {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            margin-bottom: 32px;
        }

        .footer-brand {
            flex: 1;
            min-width: 240px;
        }

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 14px;
        }

        .footer-logo span:last-child {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
        }

        .footer-brand p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 300px;
        }

        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            flex: 2;
        }

        .footer-col h4 {
            font-size: 0.95rem;
            color: #fff;
            margin-bottom: 12px;
            font-weight: 600;
        }

        .footer-col a {
            display: block;
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-bottom: 8px;
            transition: color var(--transition);
        }

        .footer-col a:hover {
            color: var(--accent-green);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 10px 20px;
            align-items: center;
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .footer-bottom a {
            color: var(--text-secondary);
            font-size: 0.8rem;
            transition: color var(--transition);
        }

        .footer-bottom a:hover {
            color: var(--accent-green);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .data-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .topic-grid {
                grid-template-columns: 1fr 1fr;
            }

            .section {
                padding: 64px 0;
            }

            .category-hero h1 {
                font-size: 2rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-gap: 48px;
                --card-gap: 16px;
            }

            .nav-toggle {
                display: flex;
            }

            .nav-menu {
                display: none;
                flex-direction: column;
                gap: 6px;
                position: absolute;
                top: 72px;
                left: 0;
                right: 0;
                background: rgba(10,15,30,0.97);
                backdrop-filter: blur(16px);
                padding: 20px 24px;
                border-bottom: 1px solid rgba(255,255,255,0.08);
                box-shadow: 0 20px 40px rgba(0,0,0,0.5);
            }

            .nav-menu.open {
                display: flex;
            }

            .nav-menu li a {
                padding: 12px 14px;
                font-size: 1rem;
            }

            .nav-cta {
                gap: 8px;
            }

            .nav-cta .btn-primary {
                padding: 8px 14px;
                font-size: 0.8rem;
                min-height: 36px;
            }

            .category-hero {
                padding: 40px 0 36px;
            }

            .category-hero h1 {
                font-size: 1.7rem;
            }

            .filter-search {
                flex-direction: column;
                align-items: stretch;
                padding: 12px;
            }

            .filter-search select,
            .filter-search input {
                width: 100%;
                min-width: 0;
            }

            .filter-search .btn-search {
                justify-content: center;
            }

            .data-grid {
                grid-template-columns: 1fr;
            }

            .topic-grid {
                grid-template-columns: 1fr;
            }

            .subscribe-panel {
                flex-direction: column;
                padding: 28px 20px;
            }

            .subscribe-panel .sub-form {
                flex-direction: column;
                width: 100%;
            }

            .subscribe-panel .sub-form button {
                width: 100%;
            }

            .cta-section {
                padding: 40px 20px;
            }

            .cta-section h2 {
                font-size: 1.5rem;
            }

            .ranking-item {
                flex-wrap: wrap;
                gap: 12px;
            }

            .ranking-item .rank-value {
                margin-left: 54px;
            }

            .footer-top {
                flex-direction: column;
                gap: 28px;
            }

            .footer-links {
                gap: 24px;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .nav-container {
                padding: 0 16px;
                min-height: 64px;
            }

            .nav-menu {
                top: 64px;
            }

            .nav-logo a {
                font-size: 1.1rem;
            }

            .nav-logo .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 15px;
            }

            .category-hero h1 {
                font-size: 1.4rem;
            }

            .category-hero .hero-lead {
                font-size: 0.92rem;
            }

            .section-title {
                font-size: 1.4rem;
            }

            .data-card .card-body {
                padding: 14px 16px 16px;
            }

            .data-card .card-body h3 {
                font-size: 0.95rem;
            }

            .ranking-item {
                padding: 12px 14px;
            }

            .dimension-row {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
                padding: 16px;
            }

            .topic-card {
                min-height: 170px;
            }

            .topic-card .topic-overlay {
                padding: 18px;
            }

            .cta-section h2 {
                font-size: 1.3rem;
            }
        }

/* roulang page: category3 */
:root {
            --bg-deep: #0A0F1E;
            --bg-dark: #0D1428;
            --brand-blue: #1B2A4A;
            --brand-blue-light: #14335C;
            --accent-cyan: #35C8F0;
            --accent-green: #7DFF6E;
            --accent-gold: #F4B956;
            --text-main: #D8E2F0;
            --text-secondary: #8DA3C7;
            --text-muted: #5C6F8F;
            --card-bg: rgba(255,255,255,0.05);
            --card-bg-hover: rgba(255,255,255,0.10);
            --card-border: rgba(255,255,255,0.12);
            --card-radius: 16px;
            --card-radius-sm: 8px;
            --card-padding: 24px;
            --card-shadow: 0 8px 32px rgba(0,0,0,0.35);
            --card-shadow-hover: 0 12px 40px rgba(0,0,0,0.45);
            --transition: 220ms ease;
            --container-width: 1200px;
            --section-gap: 96px;
            --card-gap: 24px;
            --font-main: 'PingFang SC','Microsoft YaHei','Inter','Roboto Condensed',sans-serif;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-main);
            background-color: var(--bg-deep);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--card-radius-sm);
        }

        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover {
            color: var(--accent-green);
        }

        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }

        button {
            cursor: pointer;
            background: none;
        }

        input:focus, select:focus, textarea:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: linear-gradient(135deg, var(--brand-blue) 0%, var(--bg-deep) 80%);
            border-bottom: 1px solid rgba(255,255,255,0.08);
            box-shadow: 0 4px 20px rgba(0,0,0,0.3);
        }

        .nav-container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            gap: 24px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .nav-logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #E7F0FF;
            font-weight: 700;
            font-size: 1.4rem;
            letter-spacing: 0.5px;
            transition: opacity var(--transition);
        }

        .nav-logo a:hover {
            color: #E7F0FF;
            opacity: 0.85;
        }

        .nav-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--brand-blue-light));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            font-weight: 800;
            box-shadow: 0 0 16px rgba(53,200,240,0.4);
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            flex-wrap: wrap;
        }

        .nav-menu li a {
            display: block;
            padding: 8px 14px;
            color: #E7F0FF;
            font-size: 0.92rem;
            font-weight: 500;
            border-radius: 6px;
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }

        .nav-menu li a:hover,
        .nav-menu li a.active {
            background: rgba(255,255,255,0.12);
            color: #fff;
        }

        .nav-menu li a.active {
            box-shadow: inset 0 -2px 0 var(--accent-cyan);
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .nav-cta .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 10px 22px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 0 0 20px rgba(53,200,240,0.35);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .nav-cta .btn-primary:hover {
            box-shadow: 0 0 32px rgba(53,200,240,0.55);
            transform: translateY(-1px);
        }

        .nav-cta .btn-primary:active {
            transform: scale(0.97);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
        }

        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: #E7F0FF;
            border-radius: 2px;
            transition: transform var(--transition), opacity var(--transition);
        }

        /* Buttons */
        .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 14px 28px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1rem;
            box-shadow: 0 0 20px rgba(53,200,240,0.35);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 48px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border: none;
        }

        .btn-primary:hover {
            box-shadow: 0 0 48px rgba(53,200,240,0.55);
            transform: translateY(-2px);
            color: #0A0F1E;
        }

        .btn-primary:active {
            transform: scale(0.97);
        }

        .btn-secondary {
            background: transparent;
            color: var(--accent-cyan);
            padding: 14px 28px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 1rem;
            border: 1px solid var(--accent-cyan);
            transition: background var(--transition), color var(--transition), transform var(--transition);
            min-height: 48px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .btn-secondary:hover {
            background: rgba(53,200,240,0.15);
            color: var(--accent-cyan);
            transform: translateY(-2px);
        }

        .btn-secondary:active {
            transform: scale(0.97);
        }

        /* Cards */
        .card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            padding: var(--card-padding);
            box-shadow: var(--card-shadow);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition), background var(--transition);
        }

        .card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-cyan);
            box-shadow: var(--card-shadow-hover);
            background: var(--card-bg-hover);
        }

        /* Tags & Badges */
        .tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(53,200,240,0.15);
            color: var(--accent-cyan);
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            transition: background var(--transition), color var(--transition);
        }

        .tag:hover {
            background: rgba(53,200,240,0.3);
            color: #fff;
        }

        .badge-gold {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(244,185,86,0.15);
            color: var(--accent-gold);
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 600;
            letter-spacing: 0.5px;
        }

        .badge-green {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(125,255,110,0.12);
            color: var(--accent-green);
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 600;
            letter-spacing: 0.5px;
        }

        /* Section */
        .section {
            padding: var(--section-gap) 0;
        }

        .section-alt {
            background: var(--bg-dark);
        }

        .section-title {
            font-size: 1.8rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }

        .section-subtitle {
            color: var(--text-secondary);
            font-size: 1rem;
            margin-bottom: 40px;
            max-width: 700px;
        }

        /* Category Hero */
        .category-hero {
            background: linear-gradient(135deg, var(--brand-blue-light) 0%, var(--bg-deep) 70%);
            padding: 48px 0 32px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }

        .category-hero .container {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .category-hero h1 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .category-hero h1 .h1-icon {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--brand-blue-light));
            border-radius: 12px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: #fff;
            box-shadow: 0 0 24px rgba(53,200,240,0.4);
        }

        .category-hero p {
            color: var(--text-secondary);
            font-size: 1rem;
            max-width: 700px;
            line-height: 1.8;
        }

        .category-hero .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            align-items: center;
            margin-top: 8px;
        }

        /* Filter/Search */
        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            align-items: center;
            margin-top: 16px;
            padding: 16px 18px;
            background: rgba(255,255,255,0.04);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: 12px;
        }

        .filter-bar input[type="search"] {
            flex: 1;
            min-width: 200px;
            padding: 10px 16px;
            background: rgba(255,255,255,0.08);
            border: 1px solid rgba(255,255,255,0.15);
            border-radius: 8px;
            color: var(--text-main);
            font-size: 0.9rem;
            transition: border-color var(--transition);
        }

        .filter-bar input[type="search"]::placeholder {
            color: var(--text-muted);
        }

        .filter-bar input[type="search"]:focus {
            border-color: var(--accent-cyan);
            outline: none;
        }

        .filter-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .filter-tags .filter-tag {
            padding: 6px 14px;
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.12);
            border-radius: 20px;
            color: var(--text-secondary);
            font-size: 0.82rem;
            font-weight: 500;
            cursor: pointer;
            transition: background var(--transition), color var(--transition), border-color var(--transition);
        }

        .filter-tags .filter-tag:hover,
        .filter-tags .filter-tag.active {
            background: rgba(53,200,240,0.2);
            color: var(--accent-cyan);
            border-color: var(--accent-cyan);
        }

        /* Topic Card Grid */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }

        .topic-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            overflow: hidden;
            box-shadow: var(--card-shadow);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
            display: flex;
            flex-direction: column;
        }

        .topic-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-cyan);
            box-shadow: var(--card-shadow-hover);
        }

        .topic-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
        }

        .topic-card .card-body {
            padding: 20px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            flex: 1;
        }

        .topic-card .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }

        .topic-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: #fff;
            line-height: 1.5;
            margin: 0;
        }

        .topic-card .card-summary {
            color: var(--text-secondary);
            font-size: 0.85rem;
            line-height: 1.7;
        }

        .topic-card .card-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.78rem;
            color: var(--text-muted);
            margin-top: auto;
            padding-top: 10px;
            border-top: 1px solid rgba(255,255,255,0.08);
        }

        /* View More */
        .view-more-wrapper {
            display: flex;
            justify-content: center;
            margin-top: 32px;
        }

        /* Ranking List */
        .rank-list {
            display: flex;
            flex-direction: column;
            gap: 0;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            overflow: hidden;
            box-shadow: var(--card-shadow);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }

        .rank-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 16px 20px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            transition: background var(--transition);
        }

        .rank-item:last-child {
            border-bottom: none;
        }

        .rank-item:hover {
            background: rgba(255,255,255,0.06);
        }

        .rank-num {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--accent-gold);
            min-width: 44px;
            text-align: center;
            flex-shrink: 0;
        }

        .rank-item:nth-child(1) .rank-num {
            color: var(--accent-green);
            font-size: 1.6rem;
        }

        .rank-item:nth-child(2) .rank-num {
            color: var(--accent-cyan);
        }

        .rank-item:nth-child(3) .rank-num {
            color: var(--text-secondary);
        }

        .rank-content {
            flex: 1;
        }

        .rank-content h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 4px;
        }

        .rank-content p {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .rank-stats {
            display: flex;
            gap: 12px;
            align-items: center;
            flex-shrink: 0;
        }

        .rank-stats span {
            font-size: 0.8rem;
            color: var(--text-secondary);
            white-space: nowrap;
        }

        /* Featured Deep Dive */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--card-gap);
        }

        .feature-card {
            position: relative;
            border-radius: var(--card-radius);
            overflow: hidden;
            min-height: 300px;
            display: flex;
            align-items: flex-end;
            box-shadow: var(--card-shadow);
            border: 1px solid var(--card-border);
            transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-cyan);
            box-shadow: var(--card-shadow-hover);
        }

        .feature-card .feature-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
        }

        .feature-card .feature-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to top, rgba(10,15,30,0.95) 20%, rgba(10,15,30,0.4) 60%, rgba(10,15,30,0.2) 100%);
            border-radius: 0;
        }

        .feature-card .feature-content {
            position: relative;
            z-index: 2;
            padding: 24px;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .feature-card .feature-content h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
        }

        .feature-card .feature-content p {
            color: var(--text-secondary);
            font-size: 0.9rem;
        }

        /* Tag Cloud */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            padding: 24px;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            box-shadow: var(--card-shadow);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }

        .tag-cloud .cloud-tag {
            padding: 8px 18px;
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.12);
            border-radius: 24px;
            color: var(--text-secondary);
            font-size: 0.85rem;
            font-weight: 500;
            cursor: pointer;
            transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
        }

        .tag-cloud .cloud-tag:hover {
            background: rgba(53,200,240,0.2);
            color: var(--accent-cyan);
            border-color: var(--accent-cyan);
            transform: translateY(-2px);
        }

        /* Subscribe */
        .subscribe-box {
            background: linear-gradient(135deg, var(--brand-blue-light) 0%, var(--bg-dark) 60%);
            border: 1px solid rgba(53,200,240,0.25);
            border-radius: var(--card-radius);
            padding: 40px;
            text-align: center;
            box-shadow: 0 8px 40px rgba(0,0,0,0.4);
        }

        .subscribe-box h3 {
            font-size: 1.5rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .subscribe-box p {
            color: var(--text-secondary);
            margin-bottom: 24px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }

        .subscribe-form {
            display: flex;
            gap: 12px;
            max-width: 480px;
            margin: 0 auto;
            flex-wrap: wrap;
        }

        .subscribe-form input[type="email"] {
            flex: 1;
            min-width: 200px;
            padding: 12px 16px;
            background: rgba(255,255,255,0.08);
            border: 1px solid rgba(255,255,255,0.15);
            border-radius: 8px;
            color: var(--text-main);
            font-size: 0.9rem;
        }

        .subscribe-form input[type="email"]::placeholder {
            color: var(--text-muted);
        }

        .subscribe-form input[type="email"]:focus {
            border-color: var(--accent-cyan);
            outline: none;
        }

        .subscribe-form .btn-primary {
            min-height: 48px;
            padding: 12px 28px;
        }

        .subscribe-msg {
            margin-top: 12px;
            font-size: 0.85rem;
            color: var(--accent-green);
            display: none;
        }

        .subscribe-msg.error {
            color: var(--accent-gold);
        }

        .subscribe-msg.show {
            display: block;
        }

        /* Community */
        .community-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }

        .community-item {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            padding: 20px;
            box-shadow: var(--card-shadow);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            transition: transform var(--transition), border-color var(--transition);
        }

        .community-item:hover {
            transform: translateY(-4px);
            border-color: var(--accent-cyan);
        }

        .community-item .community-stars {
            color: var(--accent-gold);
            font-size: 0.9rem;
            letter-spacing: 2px;
            margin-bottom: 8px;
        }

        .community-item .community-text {
            color: var(--text-main);
            font-size: 0.9rem;
            line-height: 1.7;
            margin-bottom: 12px;
        }

        .community-item .community-author {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .community-item .community-author .avatar {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--brand-blue-light));
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            color: #fff;
            font-weight: 700;
        }

        .community-item .community-author .author-name {
            font-size: 0.8rem;
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius-sm);
            overflow: hidden;
            transition: border-color var(--transition);
        }

        .faq-item:hover {
            border-color: rgba(53,200,240,0.4);
        }

        .faq-question {
            padding: 16px 20px;
            font-weight: 600;
            color: #fff;
            font-size: 0.95rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            background: rgba(255,255,255,0.04);
            transition: background var(--transition);
        }

        .faq-question:hover {
            background: rgba(255,255,255,0.08);
        }

        .faq-question .faq-toggle {
            font-size: 1.2rem;
            color: var(--accent-cyan);
            flex-shrink: 0;
            transition: transform var(--transition);
        }

        .faq-item.open .faq-question .faq-toggle {
            transform: rotate(45deg);
        }

        .faq-answer {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            color: var(--text-secondary);
            font-size: 0.88rem;
            line-height: 1.8;
            transition: max-height 300ms ease, padding 300ms ease;
        }

        .faq-item.open .faq-answer {
            max-height: 200px;
            padding: 12px 20px 16px;
        }

        /* Footer */
        .site-footer {
            background: var(--bg-dark);
            border-top: 1px solid rgba(255,255,255,0.08);
            padding: 48px 0 24px;
            margin-top: 0;
        }

        .footer-container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .footer-top {
            display: grid;
            grid-template-columns: 2fr 3fr;
            gap: 40px;
            margin-bottom: 32px;
        }

        .footer-brand p {
            color: var(--text-secondary);
            font-size: 0.88rem;
            margin-top: 12px;
            max-width: 320px;
        }

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
        }

        .footer-links {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer-col a {
            display: block;
            color: var(--text-secondary);
            font-size: 0.85rem;
            margin-bottom: 8px;
            transition: color var(--transition);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
            justify-content: space-between;
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 20px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .footer-bottom a {
            color: var(--text-muted);
            font-size: 0.8rem;
        }

        .footer-bottom a:hover {
            color: var(--accent-cyan);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            :root {
                --section-gap: 64px;
                --card-gap: 20px;
            }
            .topic-grid,
            .community-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .footer-top {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-gap: 48px;
                --card-gap: 16px;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-menu {
                position: absolute;
                top: 72px;
                left: 0;
                right: 0;
                background: rgba(13,20,40,0.98);
                border-bottom: 1px solid rgba(255,255,255,0.1);
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                padding: 16px 24px;
                display: none;
                box-shadow: 0 16px 32px rgba(0,0,0,0.4);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu li a {
                padding: 12px 16px;
                border-radius: 8px;
                font-size: 1rem;
            }
            .nav-cta .btn-primary {
                padding: 8px 16px;
                font-size: 0.82rem;
                min-height: 36px;
            }
            .category-hero {
                padding: 32px 0 24px;
            }
            .category-hero h1 {
                font-size: 1.6rem;
            }
            .category-hero h1 .h1-icon {
                width: 36px;
                height: 36px;
                font-size: 18px;
            }
            .topic-grid,
            .community-grid {
                grid-template-columns: 1fr;
            }
            .topic-card .card-img {
                height: 160px;
            }
            .feature-card {
                min-height: 220px;
            }
            .subscribe-box {
                padding: 24px 20px;
            }
            .subscribe-form {
                flex-direction: column;
            }
            .footer-links {
                grid-template-columns: 1fr 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .rank-item {
                flex-wrap: wrap;
                gap: 8px;
            }
            .rank-stats {
                width: 100%;
                justify-content: flex-start;
                padding-left: 60px;
            }
        }

        @media (max-width: 520px) {
            .container,
            .nav-container,
            .footer-container {
                padding: 0 16px;
            }
            .category-hero h1 {
                font-size: 1.3rem;
                gap: 8px;
            }
            .category-hero h1 .h1-icon {
                width: 32px;
                height: 32px;
                font-size: 16px;
            }
            .category-hero p {
                font-size: 0.85rem;
            }
            .filter-bar {
                padding: 12px;
                gap: 8px;
            }
            .filter-tags .filter-tag {
                font-size: 0.75rem;
                padding: 5px 10px;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .subscribe-box h3 {
                font-size: 1.2rem;
            }
            .footer-links {
                grid-template-columns: 1fr;
            }
            .btn-primary,
            .btn-secondary {
                width: 100%;
                padding: 12px 20px;
                font-size: 0.9rem;
            }
            .filter-bar input[type="search"] {
                width: 100%;
                min-width: auto;
            }
            .rank-num {
                font-size: 1.1rem;
                min-width: 32px;
            }
        }

/* roulang page: category5 */
:root {
            --bg-deep: #0A0F1E;
            --bg-dark: #0D1428;
            --brand-blue: #1B2A4A;
            --brand-blue-light: #14335C;
            --accent-cyan: #35C8F0;
            --accent-green: #7DFF6E;
            --accent-gold: #F4B956;
            --text-main: #D8E2F0;
            --text-secondary: #8DA3C7;
            --text-muted: #5C6F8F;
            --card-bg: rgba(255,255,255,0.05);
            --card-bg-hover: rgba(255,255,255,0.10);
            --card-border: rgba(255,255,255,0.12);
            --card-radius: 16px;
            --card-radius-sm: 8px;
            --card-padding: 24px;
            --card-shadow: 0 8px 32px rgba(0,0,0,0.35);
            --card-shadow-hover: 0 12px 40px rgba(0,0,0,0.45);
            --transition: 220ms ease;
            --container-width: 1200px;
            --section-gap: 96px;
            --card-gap: 24px;
            --font-main: 'PingFang SC','Microsoft YaHei','Inter','Roboto Condensed',sans-serif;
        }
        @media (max-width: 768px) {
            :root {
                --section-gap: 56px;
                --card-gap: 16px;
            }
        }
        @media (max-width: 520px) {
            :root {
                --section-gap: 48px;
                --card-gap: 16px;
            }
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-main);
            background-color: var(--bg-deep);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--card-radius-sm);
        }
        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent-green);
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        input:focus, select:focus, textarea:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: linear-gradient(135deg, var(--brand-blue) 0%, var(--bg-deep) 80%);
            border-bottom: 1px solid rgba(255,255,255,0.08);
            box-shadow: 0 4px 20px rgba(0,0,0,0.3);
        }
        .nav-container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            gap: 24px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .nav-logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #E7F0FF;
            font-weight: 700;
            font-size: 1.4rem;
            letter-spacing: 0.5px;
            transition: opacity var(--transition);
        }
        .nav-logo a:hover {
            color: #E7F0FF;
            opacity: 0.85;
        }
        .nav-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--brand-blue-light));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            font-weight: 800;
            box-shadow: 0 0 16px rgba(53,200,240,0.4);
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            flex-wrap: wrap;
        }
        .nav-menu li a {
            display: block;
            padding: 8px 14px;
            color: #E7F0FF;
            font-size: 0.92rem;
            font-weight: 500;
            border-radius: 6px;
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }
        .nav-menu li a:hover,
        .nav-menu li a.active {
            background: rgba(255,255,255,0.12);
            color: #fff;
        }
        .nav-menu li a.active {
            box-shadow: inset 0 -2px 0 var(--accent-cyan);
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .nav-cta .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 10px 22px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 0 0 20px rgba(53,200,240,0.35);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        .nav-cta .btn-primary:hover {
            box-shadow: 0 0 32px rgba(53,200,240,0.55);
            transform: translateY(-1px);
        }
        .nav-cta .btn-primary:active {
            transform: scale(0.97);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: #E7F0FF;
            border-radius: 2px;
            transition: transform var(--transition), opacity var(--transition);
        }
        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        @media (max-width: 1024px) {
            .nav-container {
                flex-wrap: wrap;
            }
            .nav-menu {
                order: 3;
                width: 100%;
                justify-content: center;
                padding-bottom: 12px;
                display: none;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-cta {
                margin-left: auto;
            }
        }
        @media (max-width: 768px) {
            .nav-container {
                padding: 0 16px;
                gap: 12px;
            }
            .nav-logo a {
                font-size: 1.2rem;
            }
            .nav-logo .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 16px;
            }
            .nav-cta .btn-primary {
                padding: 8px 16px;
                font-size: 0.82rem;
                min-height: 36px;
            }
            .nav-menu li a {
                padding: 6px 10px;
                font-size: 0.82rem;
            }
        }

        /* Container for all main content */
        main {
            flex: 1 0 auto;
        }

        /* Classification Page Hero (compact, not full homepage hero) */
        .page-hero {
            background: linear-gradient(135deg, #0D1428 0%, #1B2A4A 60%, #0A0F1E 100%);
            padding: 48px 0 40px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
            position: relative;
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(ellipse at top right, rgba(53,200,240,0.12) 0%, transparent 55%);
            pointer-events: none;
        }
        .page-hero .container {
            position: relative;
            z-index: 1;
        }
        .page-hero .hero-label {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(53,200,240,0.12);
            border: 1px solid rgba(53,200,240,0.25);
            color: var(--accent-cyan);
            border-radius: 20px;
            font-size: 0.82rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 16px;
        }
        .page-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.25;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }
        .page-hero .hero-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.7;
            margin-bottom: 24px;
        }
        .page-hero .hero-search {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            align-items: center;
        }
        .page-hero .hero-search input {
            flex: 1;
            min-width: 220px;
            max-width: 420px;
            padding: 12px 18px;
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.15);
            border-radius: var(--card-radius-sm);
            color: var(--text-main);
            font-size: 0.95rem;
            transition: border-color var(--transition), background var(--transition);
        }
        .page-hero .hero-search input::placeholder {
            color: var(--text-muted);
        }
        .page-hero .hero-search input:focus {
            border-color: var(--accent-cyan);
            background: rgba(255,255,255,0.08);
        }
        .page-hero .hero-search .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 12px 28px;
            border-radius: var(--card-radius-sm);
            font-weight: 700;
            font-size: 0.95rem;
            box-shadow: 0 0 20px rgba(53,200,240,0.35);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 48px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        .page-hero .hero-search .btn-primary:hover {
            box-shadow: 0 0 32px rgba(53,200,240,0.55);
            transform: translateY(-1px);
        }
        .page-hero .hero-image {
            margin-top: 28px;
            border-radius: var(--card-radius);
            overflow: hidden;
            border: 1px solid rgba(255,255,255,0.1);
            box-shadow: 0 8px 32px rgba(0,0,0,0.35);
        }
        .page-hero .hero-image img {
            width: 100%;
            height: auto;
            border-radius: 0;
        }
        .hero-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-top: 16px;
        }
        .hero-tags .tag {
            padding: 4px 14px;
            background: rgba(255,255,255,0.05);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: 20px;
            font-size: 0.78rem;
            color: var(--text-secondary);
        }
        .hero-tags .tag:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }

        @media (max-width: 768px) {
            .page-hero {
                padding: 32px 0 28px;
            }
            .page-hero h1 {
                font-size: 1.9rem;
            }
            .page-hero .hero-subtitle {
                font-size: 0.95rem;
            }
            .page-hero .hero-search {
                flex-direction: column;
                align-items: stretch;
            }
            .page-hero .hero-search input {
                max-width: 100%;
            }
        }

        /* Section Generic Styles */
        .section {
            padding: 56px 0;
        }
        .section-alt {
            background: var(--bg-dark);
        }
        .section-title {
            font-size: 1.8rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
            letter-spacing: 0.5px;
        }
        .section-subtitle {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 32px;
            max-width: 640px;
            line-height: 1.6;
        }
        .section-header {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            margin-bottom: 32px;
            gap: 16px;
            flex-wrap: wrap;
        }
        .section-header .left {
            flex: 1;
        }
        .section-header .right a {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--accent-cyan);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: color var(--transition);
        }
        .section-header .right a:hover {
            color: var(--accent-green);
        }

        /* Article List Cards */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--card-gap);
        }
        .article-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            padding: var(--card-padding);
            box-shadow: var(--card-shadow);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .article-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--card-shadow-hover);
            border-color: var(--accent-cyan);
            background: var(--card-bg-hover);
        }
        .article-card .card-image {
            border-radius: var(--card-radius-sm);
            overflow: hidden;
            aspect-ratio: 16/9;
            background: rgba(255,255,255,0.03);
        }
        .article-card .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--card-radius-sm);
            transition: transform var(--transition);
        }
        .article-card:hover .card-image img {
            transform: scale(1.03);
        }
        .article-card .card-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }
        .article-card .card-tags .tag {
            padding: 3px 12px;
            background: rgba(53,200,240,0.1);
            border: 1px solid rgba(53,200,240,0.2);
            border-radius: 20px;
            font-size: 0.72rem;
            color: var(--accent-cyan);
            font-weight: 600;
        }
        .article-card .card-tags .tag.gold {
            background: rgba(244,185,86,0.1);
            border-color: rgba(244,185,86,0.25);
            color: var(--accent-gold);
        }
        .article-card .card-tags .tag.green {
            background: rgba(125,255,110,0.1);
            border-color: rgba(125,255,110,0.2);
            color: var(--accent-green);
        }
        .article-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: #fff;
            line-height: 1.4;
            margin: 0;
        }
        .article-card h3 a {
            color: #fff;
            transition: color var(--transition);
        }
        .article-card h3 a:hover {
            color: var(--accent-cyan);
        }
        .article-card .card-excerpt {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
        }
        .article-card .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.78rem;
            color: var(--text-muted);
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 12px;
        }
        .article-card .card-meta .date {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        @media (max-width: 768px) {
            .article-grid {
                grid-template-columns: 1fr;
            }
            .article-card {
                padding: 18px;
            }
        }

        /* Trend Ranking List */
        .ranking-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .ranking-item {
            display: flex;
            align-items: center;
            gap: 16px;
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius-sm);
            padding: 14px 18px;
            transition: border-color var(--transition), background var(--transition), transform var(--transition);
        }
        .ranking-item:hover {
            border-color: var(--accent-cyan);
            background: var(--card-bg-hover);
            transform: translateX(4px);
        }
        .ranking-item .rank-num {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-muted);
            width: 40px;
            text-align: center;
            flex-shrink: 0;
        }
        .ranking-item:nth-child(1) .rank-num {
            color: var(--accent-gold);
        }
        .ranking-item:nth-child(2) .rank-num {
            color: var(--accent-cyan);
        }
        .ranking-item:nth-child(3) .rank-num {
            color: var(--accent-green);
        }
        .ranking-item .rank-info {
            flex: 1;
            min-width: 0;
        }
        .ranking-item .rank-info h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 2px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .ranking-item .rank-info p {
            font-size: 0.78rem;
            color: var(--text-muted);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .ranking-item .rank-views {
            font-size: 0.78rem;
            color: var(--text-muted);
            flex-shrink: 0;
            white-space: nowrap;
        }

        /* Topic Cards */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }
        .topic-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            padding: var(--card-padding);
            box-shadow: var(--card-shadow);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            position: relative;
            overflow: hidden;
        }
        .topic-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: linear-gradient(180deg, var(--accent-cyan), var(--brand-blue-light));
        }
        .topic-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--card-shadow-hover);
            border-color: var(--accent-cyan);
        }
        .topic-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }
        .topic-card p {
            font-size: 0.86rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 12px;
        }
        .topic-card .topic-link {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent-cyan);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .topic-card .topic-link:hover {
            color: var(--accent-green);
        }

        @media (max-width: 768px) {
            .topic-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Subscribe Form */
        .subscribe-box {
            background: linear-gradient(135deg, rgba(27,42,74,0.7) 0%, rgba(13,20,40,0.9) 100%);
            border: 1px solid rgba(53,200,240,0.2);
            border-radius: var(--card-radius);
            padding: 32px 36px;
            display: flex;
            align-items: center;
            gap: 32px;
            flex-wrap: wrap;
            box-shadow: 0 8px 32px rgba(0,0,0,0.35);
        }
        .subscribe-box .subscribe-text {
            flex: 1;
            min-width: 280px;
        }
        .subscribe-box .subscribe-text h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 6px;
        }
        .subscribe-box .subscribe-text p {
            font-size: 0.88rem;
            color: var(--text-secondary);
        }
        .subscribe-box .subscribe-form {
            display: flex;
            gap: 12px;
            flex: 1;
            min-width: 280px;
            flex-wrap: wrap;
        }
        .subscribe-box .subscribe-form input {
            flex: 1;
            min-width: 200px;
            padding: 12px 18px;
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.15);
            border-radius: var(--card-radius-sm);
            color: var(--text-main);
            font-size: 0.95rem;
            transition: border-color var(--transition), background var(--transition);
        }
        .subscribe-box .subscribe-form input:focus {
            border-color: var(--accent-cyan);
            background: rgba(255,255,255,0.08);
        }
        .subscribe-box .subscribe-form .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 12px 24px;
            border-radius: var(--card-radius-sm);
            font-weight: 700;
            font-size: 0.95rem;
            box-shadow: 0 0 20px rgba(53,200,240,0.35);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 48px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            white-space: nowrap;
        }
        .subscribe-box .subscribe-form .btn-primary:hover {
            box-shadow: 0 0 32px rgba(53,200,240,0.55);
            transform: translateY(-1px);
        }
        .subscribe-success {
            color: var(--accent-green);
            font-size: 0.88rem;
            font-weight: 600;
            display: none;
        }
        .subscribe-error {
            color: var(--accent-gold);
            font-size: 0.85rem;
            display: none;
        }
        @media (max-width: 768px) {
            .subscribe-box {
                padding: 24px;
                gap: 20px;
            }
            .subscribe-box .subscribe-form {
                flex-direction: column;
            }
            .subscribe-box .subscribe-form input {
                min-width: 100%;
            }
        }

        /* Tag Cloud */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .tag-cloud .cloud-tag {
            padding: 8px 18px;
            background: rgba(255,255,255,0.04);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: 20px;
            font-size: 0.82rem;
            color: var(--text-secondary);
            transition: border-color var(--transition), color var(--transition), background var(--transition);
            cursor: pointer;
        }
        .tag-cloud .cloud-tag:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background: rgba(53,200,240,0.06);
        }
        .tag-cloud .cloud-tag.large {
            font-size: 0.95rem;
            padding: 10px 22px;
        }
        .tag-cloud .cloud-tag.small {
            font-size: 0.72rem;
            padding: 6px 14px;
        }

        /* Interactive Community Box */
        .community-cta {
            background: linear-gradient(135deg, rgba(53,200,240,0.08) 0%, rgba(27,42,74,0.5) 100%);
            border: 1px solid rgba(53,200,240,0.18);
            border-radius: var(--card-radius);
            padding: 28px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
        }
        .community-cta .community-info h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 4px;
        }
        .community-cta .community-info p {
            font-size: 0.88rem;
            color: var(--text-secondary);
        }
        .community-cta .btn-outline {
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
            padding: 10px 24px;
            border-radius: var(--card-radius-sm);
            font-weight: 600;
            font-size: 0.9rem;
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }
        .community-cta .btn-outline:hover {
            background: rgba(53,200,240,0.12);
            color: #fff;
        }
        @media (max-width: 768px) {
            .community-cta {
                padding: 20px;
                flex-direction: column;
                text-align: center;
            }
        }

        /* Footer */
        .site-footer {
            background: #080C17;
            border-top: 1px solid rgba(255,255,255,0.06);
            padding: 40px 0 24px;
            flex-shrink: 0;
        }
        .footer-container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-top {
            display: flex;
            gap: 48px;
            flex-wrap: wrap;
            margin-bottom: 28px;
        }
        .footer-brand {
            flex: 1;
            min-width: 260px;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
            font-weight: 700;
            color: #E7F0FF;
            margin-bottom: 10px;
        }
        .footer-logo .logo-icon {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, #35C8F0, #14335C);
            border-radius: 8px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: #fff;
            font-weight: 800;
        }
        .footer-brand p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 12px;
        }
        .footer-links {
            display: flex;
            gap: 48px;
            flex-wrap: wrap;
            flex: 2;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: #E7F0FF;
            margin-bottom: 12px;
        }
        .footer-col a {
            display: block;
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-bottom: 8px;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent-cyan);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 18px;
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            align-items: center;
            font-size: 0.78rem;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .footer-bottom a:hover {
            color: var(--accent-cyan);
        }

        @media (max-width: 768px) {
            .footer-top {
                flex-direction: column;
                gap: 28px;
            }
            .footer-links {
                flex-direction: column;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 8px;
                align-items: flex-start;
            }
        }

/* roulang page: category4 */
:root {
        --bg-deep: #0A0F1E;
        --bg-dark: #0D1428;
        --brand-blue: #1B2A4A;
        --brand-blue-light: #14335C;
        --accent-cyan: #35C8F0;
        --accent-green: #7DFF6E;
        --accent-gold: #F4B956;
        --accent-red: #FF6B6B;
        --text-main: #D8E2F0;
        --text-secondary: #8DA3C7;
        --text-muted: #5C6F8F;
        --card-bg: rgba(255,255,255,0.05);
        --card-bg-hover: rgba(255,255,255,0.10);
        --card-border: rgba(255,255,255,0.12);
        --card-radius: 16px;
        --card-radius-sm: 8px;
        --card-padding: 24px;
        --card-padding-sm: 16px;
        --card-shadow: 0 8px 32px rgba(0,0,0,0.35);
        --card-shadow-hover: 0 12px 40px rgba(0,0,0,0.45);
        --transition: 220ms ease;
        --container-width: 1200px;
        --section-gap: 72px;
        --card-gap: 24px;
        --font-main: 'PingFang SC','Microsoft YaHei','Inter','Roboto Condensed',sans-serif;
    }
    html {
        scroll-behavior: smooth;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    body {
        font-family: var(--font-main);
        background-color: var(--bg-deep);
        color: var(--text-main);
        line-height: 1.7;
        font-size: 16px;
        overflow-x: hidden;
        margin: 0;
        padding: 0;
    }
    img {
        max-width: 100%;
        height: auto;
        display: block;
        border-radius: var(--card-radius-sm);
    }
    a {
        color: var(--accent-cyan);
        text-decoration: none;
        transition: color var(--transition);
    }
    a:hover {
        color: var(--accent-green);
    }
    button, input, select, textarea {
        font-family: inherit;
        font-size: inherit;
        border: none;
        outline: none;
    }
    button {
        cursor: pointer;
        background: none;
    }
    input:focus, select:focus, textarea:focus {
        outline: 2px solid var(--accent-cyan);
        outline-offset: 2px;
    }
    .container {
        max-width: var(--container-width);
        margin: 0 auto;
        padding: 0 24px;
    }
    /* Header & Navigation */
    .site-header {
        position: sticky;
        top: 0;
        z-index: 100;
        background: linear-gradient(135deg, var(--brand-blue) 0%, var(--bg-deep) 80%);
        border-bottom: 1px solid rgba(255,255,255,0.08);
        box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .nav-container {
        max-width: var(--container-width);
        margin: 0 auto;
        padding: 0 24px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        min-height: 72px;
        gap: 24px;
    }
    .nav-logo {
        display: flex;
        align-items: center;
        gap: 10px;
        flex-shrink: 0;
    }
    .nav-logo a {
        display: flex;
        align-items: center;
        gap: 10px;
        color: #E7F0FF;
        font-weight: 700;
        font-size: 1.4rem;
        letter-spacing: 0.5px;
        transition: opacity var(--transition);
    }
    .nav-logo a:hover {
        color: #E7F0FF;
        opacity: 0.85;
    }
    .nav-logo .logo-icon {
        width: 36px;
        height: 36px;
        background: linear-gradient(135deg, var(--accent-cyan), var(--brand-blue-light));
        border-radius: 8px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 18px;
        color: #fff;
        font-weight: 800;
        box-shadow: 0 0 16px rgba(53,200,240,0.4);
    }
    .nav-menu {
        display: flex;
        align-items: center;
        gap: 4px;
        list-style: none;
        flex-wrap: wrap;
        margin: 0;
        padding: 0;
    }
    .nav-menu li a {
        display: block;
        padding: 8px 14px;
        color: #E7F0FF;
        font-size: 0.92rem;
        font-weight: 500;
        border-radius: 6px;
        transition: background var(--transition), color var(--transition), box-shadow var(--transition);
        white-space: nowrap;
    }
    .nav-menu li a:hover,
    .nav-menu li a.active {
        background: rgba(255,255,255,0.12);
        color: #fff;
    }
    .nav-menu li a.active {
        box-shadow: inset 0 -2px 0 var(--accent-cyan);
    }
    .nav-cta {
        display: flex;
        align-items: center;
        gap: 12px;
        flex-shrink: 0;
    }
    .nav-cta .btn-primary {
        background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
        color: #0A0F1E;
        padding: 10px 22px;
        border-radius: 8px;
        font-weight: 700;
        font-size: 0.9rem;
        box-shadow: 0 0 20px rgba(53,200,240,0.35);
        transition: box-shadow var(--transition), transform var(--transition);
        min-height: 40px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
    .nav-cta .btn-primary:hover {
        box-shadow: 0 0 32px rgba(53,200,240,0.55);
        transform: translateY(-1px);
    }
    .nav-cta .btn-primary:active {
        transform: scale(0.97);
    }
    .nav-toggle {
        display: none;
        flex-direction: column;
        gap: 5px;
        background: none;
        border: none;
        padding: 8px;
        cursor: pointer;
    }
    .nav-toggle span {
        display: block;
        width: 24px;
        height: 2px;
        background: #E7F0FF;
        border-radius: 2px;
        transition: transform var(--transition), opacity var(--transition);
    }
    .nav-toggle.active span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle.active span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
    /* Buttons */
    .btn-primary {
        background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
        color: #0A0F1E;
        padding: 12px 28px;
        border-radius: 8px;
        font-weight: 700;
        font-size: 0.95rem;
        box-shadow: 0 0 20px rgba(53,200,240,0.3);
        transition: box-shadow var(--transition), transform var(--transition), background var(--transition);
        min-height: 48px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border: none;
        cursor: pointer;
    }
    .btn-primary:hover {
        box-shadow: 0 0 40px rgba(53,200,240,0.55);
        transform: translateY(-2px);
        color: #0A0F1E;
    }
    .btn-primary:active {
        transform: scale(0.97);
    }
    .btn-secondary {
        background: transparent;
        color: var(--accent-cyan);
        padding: 12px 24px;
        border-radius: 8px;
        font-weight: 600;
        font-size: 0.95rem;
        border: 1px solid var(--accent-cyan);
        transition: background var(--transition), color var(--transition), box-shadow var(--transition);
        min-height: 48px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
    }
    .btn-secondary:hover {
        background: rgba(53,200,240,0.15);
        color: var(--accent-green);
        box-shadow: 0 0 20px rgba(53,200,240,0.2);
    }
    .btn-ghost {
        color: var(--text-secondary);
        padding: 8px 0;
        font-weight: 500;
        font-size: 0.9rem;
        text-decoration: underline;
        transition: color var(--transition);
        background: none;
        border: none;
        cursor: pointer;
    }
    .btn-ghost:hover {
        color: var(--accent-green);
    }
    /* Category Page Header */
    .category-header {
        position: relative;
        background: linear-gradient(180deg, var(--brand-blue-light) 0%, var(--bg-deep) 100%);
        border-bottom: 1px solid var(--card-border);
        padding: 56px 0 40px;
        overflow: hidden;
    }
    .category-header::before {
        content: '';
        position: absolute;
        top: -60%;
        right: -10%;
        width: 400px;
        height: 400px;
        border-radius: 50%;
        background: radial-gradient(circle, rgba(53,200,240,0.15) 0%, transparent 70%);
        pointer-events: none;
    }
    .category-header::after {
        content: '';
        position: absolute;
        bottom: -30%;
        left: -5%;
        width: 300px;
        height: 300px;
        border-radius: 50%;
        background: radial-gradient(circle, rgba(125,255,110,0.08) 0%, transparent 70%);
        pointer-events: none;
    }
    .category-header .container {
        position: relative;
        z-index: 1;
    }
    .category-breadcrumb {
        font-size: 0.85rem;
        color: var(--text-muted);
        margin-bottom: 16px;
    }
    .category-breadcrumb a {
        color: var(--text-secondary);
    }
    .category-breadcrumb a:hover {
        color: var(--accent-cyan);
    }
    .category-breadcrumb .sep {
        margin: 0 8px;
        color: var(--text-muted);
    }
    .category-header h1 {
        font-size: 2rem;
        font-weight: 800;
        color: #fff;
        margin: 0 0 16px;
        letter-spacing: 0.5px;
    }
    .category-header .category-intro {
        font-size: 1.05rem;
        color: var(--text-secondary);
        max-width: 680px;
        margin: 0 0 28px;
        line-height: 1.8;
    }
    .category-search-filter {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 12px;
        margin-top: 8px;
    }
    .category-search-filter .search-box {
        flex: 1;
        min-width: 260px;
        position: relative;
        max-width: 400px;
    }
    .category-search-filter .search-box input {
        width: 100%;
        padding: 12px 16px 12px 44px;
        border-radius: 8px;
        background: rgba(255,255,255,0.07);
        border: 1px solid var(--card-border);
        color: var(--text-main);
        font-size: 0.95rem;
        transition: border-color var(--transition), background var(--transition);
    }
    .category-search-filter .search-box input::placeholder {
        color: var(--text-muted);
    }
    .category-search-filter .search-box input:focus {
        border-color: var(--accent-cyan);
        background: rgba(255,255,255,0.1);
        outline: none;
    }
    .category-search-filter .search-box .search-icon {
        position: absolute;
        left: 14px;
        top: 50%;
        transform: translateY(-50%);
        color: var(--text-muted);
        font-size: 1rem;
        pointer-events: none;
    }
    .filter-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }
    .filter-tag {
        padding: 8px 16px;
        border-radius: 20px;
        background: rgba(255,255,255,0.06);
        border: 1px solid var(--card-border);
        color: var(--text-secondary);
        font-size: 0.85rem;
        cursor: pointer;
        transition: background var(--transition), color var(--transition), border-color var(--transition);
        white-space: nowrap;
    }
    .filter-tag:hover,
    .filter-tag.active {
        background: rgba(53,200,240,0.15);
        border-color: var(--accent-cyan);
        color: var(--accent-cyan);
    }
    /* Section Base */
    .section {
        padding: var(--section-gap) 0;
    }
    .section-title {
        font-size: 1.5rem;
        font-weight: 700;
        color: #fff;
        margin: 0 0 12px;
        letter-spacing: 0.3px;
    }
    .section-subtitle {
        font-size: 0.95rem;
        color: var(--text-secondary);
        margin: 0 0 32px;
        max-width: 640px;
    }
    .section-title-row {
        display: flex;
        align-items: flex-end;
        justify-content: space-between;
        gap: 24px;
        margin-bottom: 32px;
        flex-wrap: wrap;
    }
    .section-title-row .section-title {
        margin-bottom: 0;
    }
    .section-title-row .section-subtitle {
        margin-bottom: 0;
    }
    .section-link {
        flex-shrink: 0;
    }
    /* Cards */
    .card {
        background: var(--card-bg);
        border: 1px solid var(--card-border);
        border-radius: var(--card-radius);
        padding: var(--card-padding);
        box-shadow: var(--card-shadow);
        transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition), background var(--transition);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
    }
    .card:hover {
        transform: translateY(-4px);
        border-color: var(--accent-cyan);
        box-shadow: var(--card-shadow-hover);
        background: var(--card-bg-hover);
    }
    /* Post List */
    .post-list {
        display: flex;
        flex-direction: column;
        gap: 16px;
    }
    .post-card {
        display: flex;
        gap: 20px;
        align-items: flex-start;
        padding: 20px 24px;
        background: var(--card-bg);
        border: 1px solid var(--card-border);
        border-radius: var(--card-radius);
        box-shadow: var(--card-shadow);
        transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition), background var(--transition);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
    }
    .post-card:hover {
        transform: translateY(-2px);
        border-color: var(--accent-cyan);
        box-shadow: var(--card-shadow-hover);
        background: var(--card-bg-hover);
    }
    .post-thumb {
        flex-shrink: 0;
        width: 120px;
        height: 80px;
        border-radius: 8px;
        overflow: hidden;
        background: var(--brand-blue-light);
    }
    .post-thumb img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        border-radius: 8px;
    }
    .post-body {
        flex: 1;
        min-width: 0;
    }
    .post-tag-row {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        margin-bottom: 8px;
    }
    .post-tag {
        font-size: 0.72rem;
        padding: 3px 10px;
        border-radius: 4px;
        background: rgba(53,200,240,0.1);
        color: var(--accent-cyan);
        font-weight: 500;
        letter-spacing: 0.3px;
    }
    .post-tag.green {
        background: rgba(125,255,110,0.1);
        color: var(--accent-green);
    }
    .post-tag.gold {
        background: rgba(244,185,86,0.12);
        color: var(--accent-gold);
    }
    .post-title {
        font-size: 1.05rem;
        font-weight: 700;
        color: #fff;
        margin: 0 0 6px;
        line-height: 1.5;
    }
    .post-title a {
        color: #fff;
        transition: color var(--transition);
    }
    .post-title a:hover {
        color: var(--accent-cyan);
    }
    .post-excerpt {
        font-size: 0.88rem;
        color: var(--text-secondary);
        margin: 0 0 10px;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        line-height: 1.6;
    }
    .post-meta {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 16px;
        font-size: 0.8rem;
        color: var(--text-muted);
    }
    .post-meta .author-avatar {
        width: 24px;
        height: 24px;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--accent-cyan), var(--brand-blue-light));
        display: inline-flex;
        align-items: center;
        justify-content: center;
        font-size: 0.7rem;
        color: #fff;
        font-weight: 700;
        flex-shrink: 0;
    }
    .post-meta .author-name {
        color: var(--text-secondary);
    }
    .post-meta .stat {
        display: inline-flex;
        align-items: center;
        gap: 4px;
    }
    .post-meta .stat-icon {
        font-size: 0.85rem;
    }
    /* Player Ranking */
    .ranking-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
        gap: 16px;
    }
    .rank-card {
        display: flex;
        align-items: center;
        gap: 16px;
        padding: 16px 20px;
        background: var(--card-bg);
        border: 1px solid var(--card-border);
        border-radius: 12px;
        transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
    }
    .rank-card:hover {
        transform: translateY(-2px);
        border-color: var(--accent-gold);
        box-shadow: var(--card-shadow-hover);
    }
    .rank-number {
        width: 32px;
        height: 32px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 800;
        font-size: 0.95rem;
        flex-shrink: 0;
    }
    .rank-number.top1 {
        background: linear-gradient(135deg, var(--accent-gold), #E09B2D);
        color: #0A0F1E;
        box-shadow: 0 0 14px rgba(244,185,86,0.4);
    }
    .rank-number.top2 {
        background: linear-gradient(135deg, #C0C0C0, #909090);
        color: #0A0F1E;
        box-shadow: 0 0 12px rgba(192,192,192,0.3);
    }
    .rank-number.top3 {
        background: linear-gradient(135deg, #CD7F32, #A0622C);
        color: #fff;
        box-shadow: 0 0 10px rgba(205,127,50,0.3);
    }
    .rank-number.other {
        background: rgba(255,255,255,0.08);
        color: var(--text-secondary);
        border: 1px solid var(--card-border);
    }
    .rank-info {
        flex: 1;
        min-width: 0;
    }
    .rank-name {
        font-weight: 700;
        color: #fff;
        font-size: 0.95rem;
    }
    .rank-level {
        font-size: 0.8rem;
        color: var(--text-secondary);
    }
    .rank-score {
        font-weight: 700;
        color: var(--accent-green);
        font-size: 0.9rem;
        flex-shrink: 0;
    }
    /* Topic Tag Cloud */
    .tag-cloud {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
    }
    .cloud-tag {
        padding: 10px 20px;
        border-radius: 24px;
        background: rgba(255,255,255,0.06);
        border: 1px solid var(--card-border);
        color: var(--text-secondary);
        font-size: 0.9rem;
        transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
        cursor: pointer;
    }
    .cloud-tag:hover {
        background: rgba(53,200,240,0.12);
        border-color: var(--accent-cyan);
        color: var(--accent-cyan);
        transform: translateY(-2px);
    }
    .cloud-tag.hot {
        border-color: var(--accent-gold);
        color: var(--accent-gold);
    }
    /* Featured Articles */
    .featured-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--card-gap);
    }
    .featured-card {
        overflow: hidden;
        background: var(--card-bg);
        border: 1px solid var(--card-border);
        border-radius: var(--card-radius);
        box-shadow: var(--card-shadow);
        transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
    }
    .featured-card:hover {
        transform: translateY(-4px);
        border-color: var(--accent-cyan);
        box-shadow: var(--card-shadow-hover);
    }
    .featured-card .featured-img {
        width: 100%;
        height: 160px;
        overflow: hidden;
        border-radius: var(--card-radius) var(--card-radius) 0 0;
        background: var(--brand-blue-light);
    }
    .featured-card .featured-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        border-radius: 0;
    }
    .featured-card .featured-body {
        padding: 20px;
    }
    .featured-card .featured-title {
        font-size: 1rem;
        font-weight: 700;
        color: #fff;
        margin: 0 0 8px;
    }
    .featured-card .featured-excerpt {
        font-size: 0.85rem;
        color: var(--text-secondary);
        margin: 0 0 12px;
        line-height: 1.6;
    }
    .featured-card .featured-meta {
        font-size: 0.78rem;
        color: var(--text-muted);
    }
    /* Stats Bar */
    .stats-bar {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
        gap: 16px;
    }
    .stat-item {
        text-align: center;
        padding: 24px 16px;
        background: var(--card-bg);
        border: 1px solid var(--card-border);
        border-radius: 12px;
        transition: background var(--transition), border-color var(--transition);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
    }
    .stat-item:hover {
        background: var(--card-bg-hover);
        border-color: var(--accent-cyan);
    }
    .stat-value {
        font-size: 2rem;
        font-weight: 800;
        color: var(--accent-cyan);
        margin-bottom: 4px;
        letter-spacing: 0.5px;
    }
    .stat-label {
        font-size: 0.85rem;
        color: var(--text-secondary);
    }
    /* Announcement */
    .announcement-card {
        display: flex;
        align-items: center;
        gap: 20px;
        padding: 20px 24px;
        background: linear-gradient(135deg, rgba(244,185,86,0.08), rgba(244,185,86,0.02));
        border: 1px solid rgba(244,185,86,0.25);
        border-radius: var(--card-radius);
        margin-bottom: 16px;
    }
    .announcement-card .announcement-icon {
        font-size: 2rem;
        flex-shrink: 0;
    }
    .announcement-card .announcement-body {
        flex: 1;
    }
    .announcement-card .announcement-title {
        font-weight: 700;
        color: var(--accent-gold);
        font-size: 0.95rem;
        margin-bottom: 4px;
    }
    .announcement-card .announcement-text {
        font-size: 0.88rem;
        color: var(--text-secondary);
        line-height: 1.6;
        margin: 0;
    }
    /* Community CTA */
    .community-cta {
        background: linear-gradient(135deg, var(--brand-blue) 0%, var(--bg-deep) 100%);
        border: 1px solid var(--card-border);
        border-radius: var(--card-radius);
        padding: 48px 40px;
        text-align: center;
        position: relative;
        overflow: hidden;
    }
    .community-cta::before {
        content: '';
        position: absolute;
        top: -50%;
        left: 50%;
        transform: translateX(-50%);
        width: 500px;
        height: 500px;
        border-radius: 50%;
        background: radial-gradient(circle, rgba(53,200,240,0.12) 0%, transparent 70%);
        pointer-events: none;
    }
    .community-cta h2 {
        font-size: 1.6rem;
        font-weight: 800;
        color: #fff;
        margin: 0 0 12px;
        position: relative;
    }
    .community-cta p {
        font-size: 1rem;
        color: var(--text-secondary);
        max-width: 560px;
        margin: 0 auto 28px;
        position: relative;
        line-height: 1.8;
    }
    .community-cta .cta-actions {
        display: flex;
        gap: 16px;
        justify-content: center;
        flex-wrap: wrap;
        position: relative;
    }
    /* Footer */
    .site-footer {
        background: var(--bg-dark);
        border-top: 1px solid rgba(255,255,255,0.08);
        padding: 56px 0 32px;
        margin-top: 32px;
    }
    .footer-container {
        max-width: var(--container-width);
        margin: 0 auto;
        padding: 0 24px;
    }
    .footer-top {
        display: flex;
        justify-content: space-between;
        gap: 40px;
        flex-wrap: wrap;
        margin-bottom: 40px;
    }
    .footer-brand {
        max-width: 320px;
        flex-shrink: 0;
    }
    .footer-logo {
        display: flex;
        align-items: center;
        gap: 10px;
        margin-bottom: 16px;
    }
    .footer-logo .logo-icon {
        width: 32px;
        height: 32px;
        background: linear-gradient(135deg, #35C8F0, #14335C);
        border-radius: 8px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        font-size: 16px;
        color: #fff;
        font-weight: 800;
    }
    .footer-logo span:last-child {
        font-weight: 700;
        font-size: 1.2rem;
        color: #E7F0FF;
    }
    .footer-brand p {
        font-size: 0.9rem;
        color: var(--text-secondary);
        line-height: 1.7;
        margin: 0;
    }
    .footer-links {
        display: flex;
        gap: 48px;
        flex-wrap: wrap;
    }
    .footer-col h4 {
        font-size: 0.95rem;
        font-weight: 700;
        color: #fff;
        margin: 0 0 16px;
    }
    .footer-col a {
        display: block;
        font-size: 0.88rem;
        color: var(--text-secondary);
        margin-bottom: 10px;
        transition: color var(--transition);
    }
    .footer-col a:hover {
        color: var(--accent-cyan);
    }
    .footer-bottom {
        display: flex;
        flex-wrap: wrap;
        gap: 12px 24px;
        align-items: center;
        justify-content: space-between;
        padding-top: 24px;
        border-top: 1px solid rgba(255,255,255,0.06);
        font-size: 0.82rem;
        color: var(--text-muted);
    }
    .footer-bottom a {
        color: var(--text-muted);
        transition: color var(--transition);
    }
    .footer-bottom a:hover {
        color: var(--accent-cyan);
    }
    /* Responsive */
    @media (max-width: 1024px) {
        .featured-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }
    @media (max-width: 768px) {
        :root {
            --section-gap: 48px;
            --card-gap: 16px;
        }
        .nav-container {
            flex-wrap: wrap;
            min-height: auto;
            padding-top: 12px;
            padding-bottom: 12px;
            gap: 12px;
        }
        .nav-logo {
            flex: 1;
        }
        .nav-toggle {
            display: flex;
            order: 3;
        }
        .nav-cta {
            order: 2;
        }
        .nav-menu {
            display: none;
            width: 100%;
            flex-direction: column;
            align-items: stretch;
            gap: 2px;
            padding: 8px 0 12px;
            background: rgba(13,20,40,0.95);
            border-radius: 8px;
            order: 4;
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
        }
        .nav-menu.open {
            display: flex;
        }
        .nav-menu li a {
            padding: 10px 16px;
            font-size: 0.95rem;
        }
        .category-header {
            padding: 32px 0 28px;
        }
        .category-header h1 {
            font-size: 1.5rem;
        }
        .category-header .category-intro {
            font-size: 0.92rem;
        }
        .post-card {
            flex-direction: column;
            gap: 14px;
            padding: 16px;
        }
        .post-thumb {
            width: 100%;
            height: 160px;
        }
        .featured-grid {
            grid-template-columns: 1fr;
        }
        .community-cta {
            padding: 32px 20px;
        }
        .community-cta h2 {
            font-size: 1.3rem;
        }
        .footer-top {
            flex-direction: column;
            gap: 32px;
        }
        .footer-links {
            gap: 32px;
            flex-wrap: wrap;
        }
        .footer-bottom {
            flex-direction: column;
            align-items: flex-start;
            gap: 8px;
        }
        .section-title {
            font-size: 1.25rem;
        }
        .section-title-row {
            flex-direction: column;
            align-items: flex-start;
        }
    }
    @media (max-width: 520px) {
        .container {
            padding: 0 16px;
        }
        .nav-container {
            padding-left: 16px;
            padding-right: 16px;
        }
        .nav-cta .btn-primary {
            padding: 8px 14px;
            font-size: 0.8rem;
            min-height: 36px;
        }
        .category-header h1 {
            font-size: 1.3rem;
        }
        .category-search-filter .search-box {
            min-width: 100%;
            max-width: 100%;
        }
        .filter-tag {
            padding: 6px 12px;
            font-size: 0.78rem;
        }
        .post-title {
            font-size: 0.95rem;
        }
        .post-excerpt {
            font-size: 0.82rem;
        }
        .stats-bar {
            grid-template-columns: repeat(2, 1fr);
        }
        .stat-value {
            font-size: 1.5rem;
        }
        .ranking-grid {
            grid-template-columns: 1fr;
        }
    }

/* roulang page: category6 */
:root {
            --bg-deep: #0A0F1E;
            --bg-dark: #0D1428;
            --brand-blue: #1B2A4A;
            --brand-blue-light: #14335C;
            --accent-cyan: #35C8F0;
            --accent-green: #7DFF6E;
            --accent-gold: #F4B956;
            --text-main: #D8E2F0;
            --text-secondary: #8DA3C7;
            --text-muted: #5C6F8F;
            --card-bg: rgba(255, 255, 255, 0.05);
            --card-bg-hover: rgba(255, 255, 255, 0.10);
            --card-border: rgba(255, 255, 255, 0.12);
            --card-radius: 16px;
            --card-radius-sm: 8px;
            --card-padding: 24px;
            --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
            --card-shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.45);
            --transition: 220ms ease;
            --container-width: 1200px;
            --section-gap: 64px;
            --card-gap: 24px;
            --font-main: 'PingFang SC', 'Microsoft YaHei', 'Inter', 'Roboto Condensed', sans-serif;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-main);
            background-color: var(--bg-deep);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
            margin: 0;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--card-radius-sm);
        }

        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover {
            color: var(--accent-green);
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }

        button {
            cursor: pointer;
            background: none;
        }

        input:focus,
        select:focus,
        textarea:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: linear-gradient(135deg, var(--brand-blue) 0%, var(--bg-deep) 80%);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }

        .nav-container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            gap: 24px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .nav-logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #E7F0FF;
            font-weight: 700;
            font-size: 1.4rem;
            letter-spacing: 0.5px;
            transition: opacity var(--transition);
        }

        .nav-logo a:hover {
            color: #E7F0FF;
            opacity: 0.85;
        }

        .nav-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--brand-blue-light));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            font-weight: 800;
            box-shadow: 0 0 16px rgba(53, 200, 240, 0.4);
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            flex-wrap: wrap;
            margin: 0;
            padding: 0;
        }

        .nav-menu li a {
            display: block;
            padding: 8px 14px;
            color: #E7F0FF;
            font-size: 0.92rem;
            font-weight: 500;
            border-radius: 6px;
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }

        .nav-menu li a:hover,
        .nav-menu li a.active {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
        }

        .nav-menu li a.active {
            box-shadow: inset 0 -2px 0 var(--accent-cyan);
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .nav-cta .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 10px 22px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 0 0 20px rgba(53, 200, 240, 0.35);
            transition: box-shadow var(--transition), transform var(--transition);
            min-height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .nav-cta .btn-primary:hover {
            box-shadow: 0 0 32px rgba(53, 200, 240, 0.55);
            transform: translateY(-1px);
        }

        .nav-cta .btn-primary:active {
            transform: scale(0.97);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
        }

        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: #E7F0FF;
            border-radius: 2px;
            transition: transform var(--transition), opacity var(--transition);
        }

        /* Buttons */
        .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #2BA8D0);
            color: #0A0F1E;
            padding: 12px 28px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 0.95rem;
            box-shadow: 0 0 20px rgba(53, 200, 240, 0.35);
            transition: box-shadow var(--transition), transform var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 48px;
            cursor: pointer;
        }

        .btn-primary:hover {
            box-shadow: 0 0 32px rgba(53, 200, 240, 0.55);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: scale(0.97);
        }

        .btn-secondary {
            background: transparent;
            color: var(--accent-cyan);
            padding: 10px 24px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.95rem;
            border: 1px solid var(--accent-cyan);
            transition: background var(--transition), color var(--transition), transform var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 48px;
            cursor: pointer;
        }

        .btn-secondary:hover {
            background: rgba(53, 200, 240, 0.15);
            color: var(--accent-green);
            border-color: var(--accent-green);
            transform: translateY(-1px);
        }

        .btn-secondary:active {
            transform: scale(0.97);
        }

        .btn-ghost {
            background: none;
            color: var(--accent-cyan);
            padding: 8px 12px;
            font-weight: 500;
            font-size: 0.9rem;
            border-bottom: 1px solid transparent;
            transition: color var(--transition), border-color var(--transition);
            cursor: pointer;
        }

        .btn-ghost:hover {
            color: var(--accent-green);
            border-bottom-color: var(--accent-green);
        }

        /* Section common */
        section {
            padding: var(--section-gap) 0;
        }

        .section-header {
            margin-bottom: 40px;
            max-width: 800px;
        }

        .section-header h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-main);
            margin: 0 0 12px;
            letter-spacing: 0.5px;
        }

        .section-header p {
            color: var(--text-secondary);
            font-size: 1rem;
            margin: 0;
            line-height: 1.8;
        }

        /* Category Hero (not full-screen) */
        .category-hero {
            background: linear-gradient(145deg, var(--brand-blue) 0%, var(--bg-dark) 90%);
            padding: 40px 0 48px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            position: relative;
            overflow: hidden;
        }

        .category-hero::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(53, 200, 240, 0.15) 0%, transparent 70%);
            pointer-events: none;
        }

        .category-hero .container {
            position: relative;
            z-index: 1;
        }

        .category-hero h1 {
            font-size: 2.2rem;
            font-weight: 700;
            color: #fff;
            margin: 0 0 12px;
            letter-spacing: 0.5px;
        }

        .category-hero .hero-desc {
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 720px;
            line-height: 1.8;
            margin: 0 0 20px;
        }

        .hero-actions {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            align-items: center;
        }

        .hero-meta {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
            margin-top: 20px;
            color: var(--text-muted);
            font-size: 0.85rem;
        }

        .hero-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .hero-meta .dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--accent-green);
            display: inline-block;
        }

        /* Cards */
        .glass-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius);
            padding: var(--card-padding);
            box-shadow: var(--card-shadow);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition), background var(--transition);
        }

        .glass-card:hover {
            transform: translateY(-4px);
            border-color: rgba(53, 200, 240, 0.5);
            box-shadow: var(--card-shadow-hover);
            background: var(--card-bg-hover);
        }

        /* Plans */
        .plans-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }

        .plan-card {
            position: relative;
            display: flex;
            flex-direction: column;
        }

        .plan-card.featured {
            border-color: var(--accent-gold);
            box-shadow: 0 0 32px rgba(244, 185, 86, 0.2);
        }

        .plan-badge {
            position: absolute;
            top: -12px;
            right: 20px;
            background: var(--accent-gold);
            color: #0A0F1E;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 12px;
            letter-spacing: 0.5px;
        }

        .plan-name {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 4px;
        }

        .plan-price {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-cyan);
            margin: 8px 0 4px;
            letter-spacing: -0.5px;
        }

        .plan-price span {
            font-size: 0.9rem;
            font-weight: 400;
            color: var(--text-muted);
        }

        .plan-desc {
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin: 0 0 16px;
            line-height: 1.6;
        }

        .plan-features {
            list-style: none;
            margin: 0 0 20px;
            padding: 0;
            flex: 1;
        }

        .plan-features li {
            padding: 6px 0;
            color: var(--text-secondary);
            font-size: 0.88rem;
            display: flex;
            align-items: center;
            gap: 8px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }

        .plan-features li:last-child {
            border-bottom: none;
        }

        .plan-features li::before {
            content: '✓';
            color: var(--accent-green);
            font-weight: 700;
            flex-shrink: 0;
        }

        .plan-btn {
            width: 100%;
        }

        /* Benefits */
        .benefits-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }

        .benefit-card {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            gap: 10px;
        }

        .benefit-icon {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background: linear-gradient(135deg, rgba(53, 200, 240, 0.2), rgba(20, 51, 92, 0.5));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--accent-cyan);
            border: 1px solid rgba(53, 200, 240, 0.3);
        }

        .benefit-card h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-main);
            margin: 0;
        }

        .benefit-card p {
            color: var(--text-secondary);
            font-size: 0.88rem;
            margin: 0;
            line-height: 1.6;
        }

        /* Article list */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--card-gap);
        }

        .article-card {
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .article-card .cover {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: var(--card-radius-sm) var(--card-radius-sm) 0 0;
        }

        .article-body {
            padding: 16px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .article-tag {
            display: inline-block;
            background: rgba(53, 200, 240, 0.15);
            color: var(--accent-cyan);
            font-size: 0.72rem;
            font-weight: 600;
            padding: 2px 10px;
            border-radius: 12px;
            margin-bottom: 8px;
            align-self: flex-start;
            letter-spacing: 0.5px;
        }

        .article-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-main);
            margin: 0 0 8px;
            line-height: 1.5;
        }

        .article-card p {
            color: var(--text-secondary);
            font-size: 0.85rem;
            margin: 0 0 12px;
            line-height: 1.6;
            flex: 1;
        }

        .article-meta {
            color: var(--text-muted);
            font-size: 0.75rem;
            display: flex;
            gap: 12px;
            align-items: center;
        }

        .view-all-wrap {
            margin-top: 24px;
            text-align: center;
        }

        /* Rankings */
        .rankings-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--card-gap);
        }

        .ranking-list {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .ranking-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .ranking-list li:last-child {
            border-bottom: none;
        }

        .rank-num {
            width: 28px;
            height: 28px;
            border-radius: 6px;
            background: rgba(53, 200, 240, 0.15);
            color: var(--accent-cyan);
            font-weight: 700;
            font-size: 0.85rem;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .ranking-list li:nth-child(1) .rank-num {
            background: rgba(244, 185, 86, 0.25);
            color: var(--accent-gold);
        }

        .ranking-list li:nth-child(2) .rank-num {
            background: rgba(125, 255, 110, 0.15);
            color: var(--accent-green);
        }

        .rank-info {
            flex: 1;
        }

        .rank-name {
            color: var(--text-main);
            font-size: 0.9rem;
            font-weight: 600;
        }

        .rank-desc {
            color: var(--text-muted);
            font-size: 0.78rem;
        }

        .rank-value {
            color: var(--accent-cyan);
            font-size: 1.1rem;
            font-weight: 700;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--card-radius-sm);
            overflow: hidden;
            transition: border-color var(--transition);
        }

        .faq-item:hover {
            border-color: rgba(53, 200, 240, 0.3);
        }

        .faq-question {
            padding: 16px 20px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            color: var(--text-main);
            font-weight: 600;
            font-size: 0.95rem;
            transition: color var(--transition);
            user-select: none;
            -webkit-user-select: none;
        }

        .faq-question:hover {
            color: var(--accent-cyan);
        }

        .faq-toggle-icon {
            width: 20px;
            height: 20px;
            position: relative;
            flex-shrink: 0;
        }

        .faq-toggle-icon::before,
        .faq-toggle-icon::after {
            content: '';
            position: absolute;
            background: var(--accent-cyan);
            border-radius: 2px;
            transition: transform var(--transition);
        }

        .faq-toggle-icon::before {
            width: 100%;
            height: 2px;
            top: 50%;
            left: 0;
            transform: translateY(-50%);
        }

        .faq-toggle-icon::after {
            width: 2px;
            height: 100%;
            left: 50%;
            top: 0;
            transform: translateX(-50%);
        }

        .faq-item.open .faq-toggle-icon::after {
            transform: translateX(-50%) rotate(90deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 320ms ease, padding 280ms ease;
            padding: 0 20px;
            color: var(--text-secondary);
            font-size: 0.88rem;
            line-height: 1.7;
        }

        .faq-item.open .faq-answer {
            max-height: 200px;
            padding: 0 20px 16px;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(145deg, var(--brand-blue) 0%, var(--bg-deep) 85%);
            padding: 56px 0;
            text-align: center;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #fff;
            margin: 0 0 12px;
        }

        .cta-section p {
            color: var(--text-secondary);
            font-size: 1rem;
            max-width: 600px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }

        .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Explore more */
        .explore-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }

        .explore-card {
            text-align: center;
            padding: 28px 20px;
        }

        .explore-card .icon {
            font-size: 2rem;
            color: var(--accent-cyan);
            margin-bottom: 8px;
        }

        .explore-card h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-main);
            margin: 0 0 6px;
        }

        .explore-card p {
            color: var(--text-muted);
            font-size: 0.82rem;
            margin: 0 0 12px;
        }

        .explore-card a {
            font-size: 0.85rem;
            font-weight: 600;
        }

        /* Footer */
        .site-footer {
            background: #060A14;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 48px 0 24px;
            color: var(--text-secondary);
        }

        .footer-container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .footer-top {
            display: grid;
            grid-template-columns: 2fr 3fr;
            gap: 40px;
            margin-bottom: 32px;
        }

        .footer-brand .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
            font-weight: 700;
            color: #E7F0FF;
            margin-bottom: 10px;
        }

        .footer-brand p {
            color: var(--text-muted);
            font-size: 0.88rem;
            line-height: 1.6;
            max-width: 300px;
            margin: 0;
        }

        .footer-links {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .footer-col h4 {
            color: var(--text-main);
            font-size: 0.9rem;
            font-weight: 700;
            margin: 0 0 12px;
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.85rem;
            padding: 4px 0;
            transition: color var(--transition);
        }

        .footer-col a:hover {
            color: var(--accent-green);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: 16px;
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            align-items: center;
            font-size: 0.78rem;
            color: var(--text-muted);
        }

        .footer-bottom a {
            color: var(--text-muted);
            font-size: 0.78rem;
        }

        .footer-bottom a:hover {
            color: var(--accent-green);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .plans-grid,
            .benefits-grid,
            .explore-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .articles-grid {
                grid-template-columns: 1fr;
            }

            .rankings-wrap {
                grid-template-columns: 1fr;
            }

            .footer-top {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-gap: 48px;
                --card-gap: 16px;
            }

            .container {
                padding: 0 16px;
            }

            .nav-container {
                padding: 0 16px;
                min-height: 60px;
            }

            .nav-toggle {
                display: flex;
            }

            .nav-menu {
                display: none;
                position: absolute;
                top: 60px;
                left: 0;
                right: 0;
                background: rgba(10, 15, 30, 0.97);
                flex-direction: column;
                padding: 16px;
                gap: 4px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.08);
                backdrop-filter: blur(20px);
            }

            .nav-menu.open {
                display: flex;
            }

            .nav-menu li a {
                padding: 10px 14px;
                width: 100%;
                text-align: left;
                font-size: 0.95rem;
            }

            .nav-cta .btn-primary {
                padding: 8px 16px;
                font-size: 0.8rem;
                min-height: 36px;
            }

            .category-hero {
                padding: 28px 0 32px;
            }

            .category-hero h1 {
                font-size: 1.6rem;
            }

            .category-hero .hero-desc {
                font-size: 0.92rem;
            }

            .section-header h2 {
                font-size: 1.4rem;
            }

            .plans-grid,
            .benefits-grid,
            .explore-grid {
                grid-template-columns: 1fr;
            }

            .btn-primary,
            .btn-secondary {
                min-height: 44px;
                padding: 10px 20px;
                font-size: 0.88rem;
            }

            .footer-top {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .footer-links {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
        }

        @media (max-width: 520px) {
            .category-hero h1 {
                font-size: 1.35rem;
            }

            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }

            .hero-meta {
                gap: 12px;
                font-size: 0.75rem;
            }

            .article-card .cover {
                height: 160px;
            }

            .cta-section h2 {
                font-size: 1.4rem;
            }
        }