/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #e74c3c;
            --primary-dark: #c0392b;
            --primary-light: #fadbd8;
            --secondary: #2c3e50;
            --secondary-light: #34495e;
            --accent: #f39c12;
            --accent-light: #fdebd0;
            --bg-main: #f8f9fa;
            --bg-card: #ffffff;
            --bg-dark: #1a1a2e;
            --bg-dark-alt: #16213e;
            --text-primary: #2c3e50;
            --text-secondary: #5d6d7e;
            --text-light: #95a5a6;
            --text-white: #ffffff;
            --border-color: #e8e8e8;
            --border-light: #f0f0f0;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 20px rgba(0,0,0,0.1);
            --shadow-lg: 0 8px 40px rgba(0,0,0,0.15);
            --shadow-hover: 0 12px 48px rgba(231,76,60,0.2);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
            --mobile-nav-height: 64px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-primary);
            background: var(--bg-main);
            padding-top: var(--header-height);
            padding-bottom: 0;
        }
        @media (max-width: 768px) {
            body { padding-bottom: var(--mobile-nav-height); }
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
        button { cursor: pointer; background: none; }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container { padding: 0 16px; }
        }

        /* ===== Typography ===== */
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
        .section-title {
            font-size: 2rem;
            margin-bottom: 0.5rem;
            text-align: center;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            text-align: center;
            max-width: 680px;
            margin: 0 auto 2.5rem;
        }
        @media (max-width: 768px) {
            .section-title { font-size: 1.6rem; }
            .section-subtitle { font-size: 0.95rem; margin-bottom: 2rem; }
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: 2px solid transparent;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
            color: #fff;
        }
        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-secondary:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: #e67e22;
            border-color: #e67e22;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(243,156,18,0.35);
            color: #fff;
        }
        .btn-sm { padding: 8px 18px; font-size: 0.85rem; }
        .btn-lg { padding: 16px 36px; font-size: 1.05rem; }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: none;
            letter-spacing: 0.3px;
        }
        .badge-primary { background: var(--primary-light); color: var(--primary); }
        .badge-accent { background: var(--accent-light); color: #e67e22; }
        .badge-secondary { background: #e8eaf6; color: var(--secondary); }
        .badge-hot { background: #fee2e2; color: #dc2626; }
        .badge-new { background: #dbeafe; color: #2563eb; }
        .badge-rank {
            background: var(--primary);
            color: #fff;
            min-width: 28px;
            height: 28px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            font-size: 0.8rem;
            font-weight: 700;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255,255,255,0.97);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
            transition: var(--transition);
        }
        .site-header.scrolled { box-shadow: var(--shadow-md); }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.5px;
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            background: var(--primary);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.2rem;
        }
        .logo span { color: var(--secondary); }
        .logo:hover { color: var(--primary); }

        .main-nav { display: flex; align-items: center; gap: 8px; }
        .main-nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .main-nav a:hover { color: var(--primary); background: var(--primary-light); }
        .main-nav a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 4px;
        }
        .nav-cta {
            background: var(--primary) !important;
            color: #fff !important;
            padding: 8px 22px !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 600 !important;
        }
        .nav-cta:hover { background: var(--primary-dark) !important; color: #fff !important; transform: translateY(-1px); }

        /* Mobile toggle */
        .mobile-toggle {
            display: none;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--text-primary);
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .mobile-toggle:hover { background: var(--border-light); }

        /* ===== Mobile Bottom Tab Nav ===== */
        .mobile-bottom-nav {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1001;
            height: var(--mobile-nav-height);
            background: rgba(255,255,255,0.98);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid var(--border-light);
            box-shadow: 0 -2px 12px rgba(0,0,0,0.06);
            padding: 0 8px;
            align-items: center;
            justify-content: space-around;
        }
        .mobile-bottom-nav a {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            font-size: 0.65rem;
            font-weight: 500;
            color: var(--text-light);
            transition: var(--transition);
            min-width: 56px;
        }
        .mobile-bottom-nav a i { font-size: 1.2rem; }
        .mobile-bottom-nav a:hover { color: var(--primary); background: var(--primary-light); }
        .mobile-bottom-nav a.active { color: var(--primary); }
        .mobile-bottom-nav a.active i { color: var(--primary); }
        .mobile-bottom-nav .nav-cta-mobile {
            color: var(--primary);
            font-weight: 600;
        }
        .mobile-bottom-nav .nav-cta-mobile i { color: var(--primary); }

        @media (max-width: 768px) {
            .site-header { height: 60px; }
            body { padding-top: 60px; }
            .main-nav { display: none; }
            .mobile-toggle { display: flex; }
            .mobile-bottom-nav { display: flex; }
            .logo { font-size: 1.15rem; }
            .logo-icon { width: 34px; height: 34px; font-size: 1rem; }
        }
        @media (min-width: 769px) {
            .mobile-bottom-nav { display: none !important; }
            .mobile-toggle { display: none !important; }
        }

        /* ===== Hero Section ===== */
        .hero {
            position: relative;
            min-height: 560px;
            display: flex;
            align-items: center;
            background: var(--bg-dark);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.5;
            mix-blend-mode: overlay;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(26,26,46,0.92) 0%, rgba(22,33,62,0.85) 50%, rgba(231,76,60,0.3) 100%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            width: 100%;
            padding: 80px 0;
        }
        .hero .container { position: relative; z-index: 3; }
        .hero-badge {
            display: inline-block;
            padding: 6px 20px;
            background: rgba(231,76,60,0.2);
            border: 1px solid rgba(231,76,60,0.4);
            border-radius: 50px;
            color: #fca5a5;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
        }
        .hero h1 {
            font-size: 3rem;
            font-weight: 800;
            color: #fff;
            max-width: 720px;
            line-height: 1.2;
            margin-bottom: 20px;
        }
        .hero h1 em { color: var(--accent); font-style: normal; }
        .hero p {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.8);
            max-width: 600px;
            margin-bottom: 32px;
            line-height: 1.7;
        }
        .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        .hero-stat { text-align: left; }
        .hero-stat strong {
            display: block;
            font-size: 1.8rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }
        .hero-stat strong i { color: var(--accent); font-size: 1.2rem; margin-right: 4px; }
        .hero-stat span {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.6);
        }
        @media (max-width: 768px) {
            .hero { min-height: 460px; }
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 1rem; }
            .hero-stats { gap: 24px; flex-wrap: wrap; margin-top: 32px; padding-top: 24px; }
            .hero-stat strong { font-size: 1.4rem; }
            .hero-content { padding: 50px 0; }
        }
        @media (max-width: 520px) {
            .hero h1 { font-size: 1.6rem; }
            .hero-actions { flex-direction: column; }
            .hero-actions .btn { width: 100%; justify-content: center; }
        }

        /* ===== Section Common ===== */
        .section-block { padding: 70px 0; }
        .section-block-alt { background: var(--bg-card); }
        .section-block-dark {
            background: var(--bg-dark);
            color: #fff;
        }
        .section-block-dark .section-title,
        .section-block-dark .section-subtitle { color: #fff; }
        .section-block-dark .section-subtitle { color: rgba(255,255,255,0.7); }

        @media (max-width: 768px) {
            .section-block { padding: 48px 0; }
        }

        /* ===== Platform Cards ===== */
        .platform-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .platform-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
        }
        .platform-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }
        .platform-card-image {
            position: relative;
            height: 180px;
            overflow: hidden;
            background: var(--border-light);
        }
        .platform-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .platform-card:hover .platform-card-image img { transform: scale(1.05); }
        .platform-card-image .badge {
            position: absolute;
            top: 12px;
            left: 12px;
            z-index: 2;
        }
        .platform-card-image .rank-badge {
            position: absolute;
            top: 12px;
            right: 12px;
            z-index: 2;
            background: var(--primary);
            color: #fff;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.85rem;
            box-shadow: 0 2px 8px rgba(231,76,60,0.4);
        }
        .platform-card-body {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .platform-card-body h3 {
            font-size: 1.1rem;
            margin-bottom: 8px;
            font-weight: 700;
        }
        .platform-card-body h3 a { color: var(--text-primary); }
        .platform-card-body h3 a:hover { color: var(--primary); }
        .platform-card-body p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
            margin-bottom: 16px;
        }
        .platform-card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }
        .platform-card-footer .tags { display: flex; gap: 6px; flex-wrap: wrap; }
        .platform-card-footer .tags .badge { font-size: 0.7rem; padding: 2px 10px; }
        @media (max-width: 520px) {
            .platform-grid { grid-template-columns: 1fr; }
        }

        /* ===== Category Grid ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 20px;
        }
        .category-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 20px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            cursor: pointer;
        }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }
        .category-card .icon {
            width: 56px;
            height: 56px;
            margin: 0 auto 16px;
            background: var(--primary-light);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--primary);
            transition: var(--transition);
        }
        .category-card:hover .icon { background: var(--primary); color: #fff; }
        .category-card h4 { font-size: 1.05rem; font-weight: 600; margin-bottom: 6px; }
        .category-card p { font-size: 0.85rem; color: var(--text-secondary); }
        @media (max-width: 520px) {
            .category-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
            .category-card { padding: 20px 12px; }
            .category-card .icon { width: 44px; height: 44px; font-size: 1.2rem; }
        }

        /* ===== Content / News List ===== */
        .content-list { display: flex; flex-direction: column; gap: 20px; }
        .content-item {
            display: flex;
            gap: 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 20px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            align-items: flex-start;
        }
        .content-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
            transform: translateX(4px);
        }
        .content-item-image {
            flex-shrink: 0;
            width: 180px;
            height: 120px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            background: var(--border-light);
        }
        .content-item-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .content-item:hover .content-item-image img { transform: scale(1.05); }
        .content-item-body { flex: 1; min-width: 0; }
        .content-item-body .meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-light);
            margin-bottom: 8px;
        }
        .content-item-body .meta .badge { font-size: 0.7rem; padding: 2px 10px; }
        .content-item-body h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
        .content-item-body h3 a { color: var(--text-primary); }
        .content-item-body h3 a:hover { color: var(--primary); }
        .content-item-body p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .content-item-body .read-more {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            margin-top: 10px;
        }
        .content-item-body .read-more:hover { gap: 8px; }
        @media (max-width: 768px) {
            .content-item { flex-direction: column; padding: 16px; }
            .content-item-image { width: 100%; height: 180px; }
        }
        @media (max-width: 520px) {
            .content-item-image { height: 140px; }
        }

        /* ===== Features / Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 30px;
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            position: relative;
        }
        .step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .step-card .step-number {
            width: 48px;
            height: 48px;
            margin: 0 auto 16px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 700;
        }
        .step-card h4 { font-size: 1.05rem; font-weight: 600; margin-bottom: 10px; }
        .step-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }
        @media (max-width: 520px) {
            .steps-grid { grid-template-columns: 1fr; gap: 16px; }
        }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            cursor: pointer;
            transition: var(--transition);
            gap: 12px;
        }
        .faq-question i { color: var(--primary); font-size: 0.9rem; transition: var(--transition); flex-shrink: 0; }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            padding: 0 22px;
            overflow: hidden;
            transition: var(--transition);
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 22px 18px;
        }

        /* ===== CTA ===== */
        .cta-section {
            position: relative;
            background: var(--bg-dark);
            padding: 80px 0;
            text-align: center;
            overflow: hidden;
        }
        .cta-section .cta-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .cta-section .container { position: relative; z-index: 2; }
        .cta-section h2 {
            font-size: 2rem;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255,255,255,0.75);
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
        @media (max-width: 520px) {
            .cta-section { padding: 50px 0; }
            .cta-section h2 { font-size: 1.5rem; }
            .cta-actions { flex-direction: column; align-items: center; }
            .cta-actions .btn { width: 100%; max-width: 300px; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark-alt);
            color: rgba(255,255,255,0.7);
            padding: 50px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer-brand .logo { color: #fff; margin-bottom: 16px; }
        .footer-brand .logo span { color: var(--accent); }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 320px; }
        .footer-col h5 {
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 18px;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a {
            color: rgba(255,255,255,0.6);
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .footer-col ul li a:hover { color: var(--accent); padding-left: 4px; }
        .footer-bottom {
            padding-top: 24px;
            border-top: 1px solid rgba(255,255,255,0.08);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.5);
        }
        .footer-bottom a { color: rgba(255,255,255,0.6); }
        .footer-bottom a:hover { color: var(--accent); }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
            .footer-brand { grid-column: 1 / -1; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== Empty State ===== */
        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-light);
        }
        .empty-state i { font-size: 2.5rem; margin-bottom: 16px; opacity: 0.5; }
        .empty-state p { font-size: 1rem; }

        /* ===== Animations ===== */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ===== Responsive extras ===== */
        @media (max-width: 1024px) {
            .platform-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .platform-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
        }
        @media (max-width: 520px) {
            .platform-grid { grid-template-columns: 1fr; }
            .content-list { gap: 14px; }
        }

        /* Focus accessibility */
        a:focus-visible, button:focus-visible, input:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #e8491d;
            --primary-dark: #c73e17;
            --primary-light: #ff6a3d;
            --primary-bg: #fff5f0;
            --secondary: #1a2a3a;
            --secondary-light: #2c4054;
            --accent: #f5c518;
            --accent-dark: #d4a815;
            --bg: #f8f9fc;
            --bg-card: #ffffff;
            --bg-dark: #0f1a2b;
            --text: #1a1a2e;
            --text-light: #5a6a7a;
            --text-white: #ffffff;
            --border: #e8ecf0;
            --border-light: #f0f2f5;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-lg: 24px;
            --shadow: 0 8px 30px rgba(0,0,0,0.08);
            --shadow-lg: 0 20px 60px rgba(0,0,0,0.12);
            --shadow-hover: 0 16px 48px rgba(232,73,29,0.15);
            --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
            --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --max-width: 1160px;
            --header-height: 72px;
            --nav-gap: 8px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            padding-bottom: 0;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        button { cursor: pointer; border: none; background: none; }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled {
            background: rgba(255,255,255,0.98);
            box-shadow: 0 4px 20px rgba(0,0,0,0.06);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 24px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.5px;
            text-decoration: none;
        }
        .logo:hover { color: var(--text); }
        .logo-icon {
            width: 42px;
            height: 42px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 20px;
            box-shadow: 0 4px 12px rgba(232,73,29,0.3);
            flex-shrink: 0;
        }
        .logo span { color: var(--primary); font-weight: 700; }
        .main-nav {
            display: flex;
            align-items: center;
            gap: var(--nav-gap);
        }
        .main-nav a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 10px 18px;
            border-radius: 10px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-light);
            transition: all var(--transition);
            text-decoration: none;
            white-space: nowrap;
        }
        .main-nav a i { font-size: 16px; }
        .main-nav a:hover {
            color: var(--primary);
            background: var(--primary-bg);
        }
        .main-nav a.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }
        .main-nav a.nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            box-shadow: 0 4px 16px rgba(232,73,29,0.3);
            padding: 10px 22px;
            font-weight: 600;
        }
        .main-nav a.nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(232,73,29,0.4);
            color: #fff;
        }
        .nav-toggle {
            display: none;
            font-size: 24px;
            color: var(--text);
            padding: 8px;
            border-radius: 8px;
            background: var(--bg);
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
        }
        .nav-toggle:hover { background: var(--border-light); }

        /* ===== Mobile Bottom Tab ===== */
        .mobile-bottom-tab {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            background: rgba(255,255,255,0.96);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-top: 1px solid var(--border);
            z-index: 999;
            padding: 6px 0 env(safe-area-inset-bottom, 6px);
            box-shadow: 0 -4px 20px rgba(0,0,0,0.06);
        }
        .mobile-bottom-tab .tab-inner {
            display: flex;
            justify-content: space-around;
            align-items: center;
            max-width: 500px;
            margin: 0 auto;
        }
        .mobile-bottom-tab a {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 6px 12px;
            font-size: 11px;
            color: var(--text-light);
            text-decoration: none;
            border-radius: 8px;
            transition: all var(--transition);
            min-width: 56px;
        }
        .mobile-bottom-tab a i { font-size: 20px; transition: transform var(--transition); }
        .mobile-bottom-tab a.active { color: var(--primary); font-weight: 600; }
        .mobile-bottom-tab a.active i { transform: scale(1.1); }
        .mobile-bottom-tab a:hover { color: var(--primary); }

        /* ===== Article Hero / Banner ===== */
        .article-hero {
            margin-top: var(--header-height);
            padding: 80px 0 60px;
            background: linear-gradient(135deg, var(--bg-dark) 0%, #1a2a3a 100%);
            position: relative;
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: center;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.15;
            pointer-events: none;
        }
        .article-hero::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(232,73,29,0.12) 0%, transparent 70%);
            pointer-events: none;
        }
        .article-hero .container {
            position: relative;
            z-index: 2;
        }
        .article-hero .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255,255,255,0.6);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .article-hero .breadcrumb a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            transition: color var(--transition);
        }
        .article-hero .breadcrumb a:hover { color: var(--accent); }
        .article-hero .breadcrumb span { color: rgba(255,255,255,0.5); }
        .article-hero .breadcrumb i { font-size: 12px; }
        .article-hero h1 {
            font-size: 40px;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.25;
            max-width: 800px;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .article-hero .meta {
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
            color: rgba(255,255,255,0.7);
            font-size: 15px;
        }
        .article-hero .meta i { margin-right: 6px; }
        .article-hero .meta .tag {
            display: inline-block;
            padding: 4px 14px;
            background: var(--accent);
            color: #1a1a2e;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
        }

        /* ===== Article Main Content ===== */
        .article-main {
            padding: 60px 0 80px;
            flex: 1;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
            align-items: start;
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 48px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
        }
        .article-body .content {
            font-size: 17px;
            line-height: 1.85;
            color: var(--text);
        }
        .article-body .content p {
            margin-bottom: 1.4em;
        }
        .article-body .content h2 {
            font-size: 26px;
            font-weight: 700;
            margin: 2em 0 1em;
            color: var(--text);
            border-left: 5px solid var(--primary);
            padding-left: 16px;
        }
        .article-body .content h3 {
            font-size: 20px;
            font-weight: 600;
            margin: 1.6em 0 0.8em;
            color: var(--secondary);
        }
        .article-body .content ul, .article-body .content ol {
            margin: 1em 0 1.4em;
            padding-left: 24px;
        }
        .article-body .content li {
            margin-bottom: 0.5em;
        }
        .article-body .content ul li { list-style: disc; }
        .article-body .content ol li { list-style: decimal; }
        .article-body .content img {
            border-radius: var(--radius-sm);
            margin: 1.5em 0;
            box-shadow: var(--shadow);
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-bg);
            padding: 16px 24px;
            margin: 1.5em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light);
            font-style: italic;
        }
        .article-body .content a { text-decoration: underline; }
        .article-body .content .highlight-box {
            background: linear-gradient(135deg, var(--primary-bg), #fff);
            border: 1px solid rgba(232,73,29,0.15);
            border-radius: var(--radius-sm);
            padding: 24px 28px;
            margin: 1.5em 0;
        }
        .not-found-box {
            text-align: center;
            padding: 80px 20px;
        }
        .not-found-box i { font-size: 64px; color: var(--border); margin-bottom: 20px; }
        .not-found-box h2 { font-size: 28px; margin-bottom: 12px; }
        .not-found-box p { color: var(--text-light); margin-bottom: 24px; }
        .not-found-box .btn { display: inline-flex; }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
        }
        .sidebar-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 18px;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text);
        }
        .sidebar-card h3 i { color: var(--primary); }
        .sidebar-list li {
            padding: 12px 0;
            border-bottom: 1px solid var(--border-light);
        }
        .sidebar-list li:last-child { border-bottom: none; }
        .sidebar-list a {
            display: flex;
            gap: 12px;
            color: var(--text);
            text-decoration: none;
            transition: all var(--transition);
        }
        .sidebar-list a:hover { color: var(--primary); }
        .sidebar-list .thumb {
            width: 60px;
            height: 60px;
            border-radius: 8px;
            object-fit: cover;
            flex-shrink: 0;
            background: var(--border-light);
        }
        .sidebar-list .info { flex: 1; min-width: 0; }
        .sidebar-list .info .title {
            font-size: 14px;
            font-weight: 600;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .sidebar-list .info .date {
            font-size: 12px;
            color: var(--text-light);
            margin-top: 4px;
        }
        .sidebar-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .sidebar-tags a {
            display: inline-block;
            padding: 6px 16px;
            background: var(--bg);
            border-radius: 20px;
            font-size: 13px;
            color: var(--text-light);
            text-decoration: none;
            transition: all var(--transition);
            border: 1px solid var(--border);
        }
        .sidebar-tags a:hover {
            background: var(--primary-bg);
            color: var(--primary);
            border-color: var(--primary);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 10px;
            font-size: 16px;
            font-weight: 600;
            transition: all var(--transition);
            text-decoration: none;
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            box-shadow: 0 4px 16px rgba(232,73,29,0.3);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(232,73,29,0.4);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-sm { padding: 8px 18px; font-size: 14px; border-radius: 8px; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.8);
            padding: 60px 0 30px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo { color: #fff; margin-bottom: 16px; }
        .footer-brand .logo span { color: var(--primary-light); }
        .footer-brand p { font-size: 14px; line-height: 1.8; color: rgba(255,255,255,0.6); max-width: 360px; }
        .footer-col h5 {
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 18px;
            letter-spacing: 0.5px;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul a {
            color: rgba(255,255,255,0.6);
            font-size: 14px;
            text-decoration: none;
            transition: color var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .footer-col ul a:hover { color: var(--primary-light); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; }
            .article-sidebar { max-width: 480px; }
        }
        @media (max-width: 768px) {
            .header-inner { padding: 0 16px; }
            .main-nav { display: none; }
            .nav-toggle { display: flex; }
            .mobile-bottom-tab { display: block; }
            .article-hero { padding: 60px 0 40px; min-height: 220px; }
            .article-hero h1 { font-size: 28px; }
            .article-hero .meta { font-size: 13px; gap: 12px; }
            .article-body { padding: 28px 20px; }
            .article-body .content { font-size: 16px; }
            .article-body .content h2 { font-size: 22px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-brand { grid-column: 1 / -1; }
            body { padding-bottom: 68px; }
        }
        @media (max-width: 520px) {
            .article-hero h1 { font-size: 22px; }
            .article-hero { padding: 48px 0 32px; }
            .article-body { padding: 20px 16px; border-radius: var(--radius-sm); }
            .article-body .content { font-size: 15px; }
            .article-body .content h2 { font-size: 20px; padding-left: 12px; }
            .article-main { padding: 40px 0 60px; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .sidebar-card { padding: 20px; }
        }

        /* ===== Mobile Nav Drawer ===== */
        .mobile-drawer {
            display: none;
            position: fixed;
            top: var(--header-height);
            left: 0;
            width: 100%;
            background: rgba(255,255,255,0.98);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
            z-index: 998;
            padding: 16px 24px 24px;
            box-shadow: var(--shadow-lg);
            transform: translateY(-10px);
            opacity: 0;
            transition: all 0.3s ease;
        }
        .mobile-drawer.open {
            transform: translateY(0);
            opacity: 1;
        }
        .mobile-drawer a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 14px 16px;
            border-radius: 10px;
            font-size: 16px;
            font-weight: 500;
            color: var(--text);
            text-decoration: none;
            transition: all var(--transition);
        }
        .mobile-drawer a:hover { background: var(--primary-bg); color: var(--primary); }
        .mobile-drawer a.active { background: var(--primary-bg); color: var(--primary); font-weight: 600; }
        .mobile-drawer a.nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            margin-top: 8px;
        }
        .mobile-drawer a.nav-cta:hover { color: #fff; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f2b4a;
            --primary-light: #1e4a7a;
            --primary-dark: #091b30;
            --secondary: #d4a02a;
            --secondary-light: #e8bc4a;
            --accent: #e85d3a;
            --accent-light: #f07a5a;
            --bg: #f5f7fa;
            --bg-card: #ffffff;
            --bg-dark: #0a1628;
            --bg-section-alt: #edf1f7;
            --text: #1e2a3a;
            --text-light: #5a6a7a;
            --text-muted: #8a9aaa;
            --border: #dce2ea;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow: 0 6px 30px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
            --radius: 14px;
            --radius-sm: 8px;
            --radius-xl: 20px;
            --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --container: 1200px;
            --header-h: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--primary-dark);
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 头部 & 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.97);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            height: var(--header-h);
            transition: var(--transition);
        }
        .site-header.scrolled {
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-h);
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.5px;
        }
        .logo .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: var(--secondary);
            border-radius: 10px;
            color: #fff;
            font-size: 1.2rem;
        }
        .logo span {
            color: var(--secondary);
        }
        .logo:hover {
            color: var(--primary);
        }

        /* 桌面导航 */
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 10px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-light);
            transition: var(--transition);
            position: relative;
        }
        .main-nav a i {
            font-size: 1rem;
        }
        .main-nav a:hover {
            color: var(--primary);
            background: rgba(15, 43, 74, 0.06);
        }
        .main-nav a.active {
            color: var(--primary);
            background: rgba(15, 43, 74, 0.08);
            font-weight: 600;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--secondary);
            border-radius: 4px;
        }
        .main-nav a.nav-cta {
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            padding: 10px 22px;
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(15, 43, 74, 0.25);
        }
        .main-nav a.nav-cta:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(15, 43, 74, 0.3);
            color: #fff;
        }
        .main-nav a.nav-cta i {
            color: var(--secondary);
        }

        /* 移动端菜单按钮 */
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--primary);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .menu-toggle:hover {
            background: rgba(15, 43, 74, 0.06);
        }

        /* ===== 移动端底部 Tab ===== */
        .bottom-tab {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid var(--border);
            padding: 6px 0 env(safe-area-inset-bottom, 6px);
            box-shadow: 0 -2px 16px rgba(0, 0, 0, 0.06);
        }
        .bottom-tab .tab-inner {
            display: flex;
            justify-content: space-around;
            align-items: center;
            max-width: 520px;
            margin: 0 auto;
        }
        .bottom-tab .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 8px 14px;
            border-radius: var(--radius-sm);
            font-size: 0.7rem;
            font-weight: 500;
            color: var(--text-muted);
            transition: var(--transition);
            min-width: 64px;
        }
        .bottom-tab .tab-item i {
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .bottom-tab .tab-item:hover {
            color: var(--primary);
        }
        .bottom-tab .tab-item.active {
            color: var(--primary);
            font-weight: 600;
        }
        .bottom-tab .tab-item.active i {
            color: var(--secondary);
        }
        .bottom-tab .tab-item.nav-cta-tab {
            background: var(--primary);
            color: #fff;
            border-radius: 30px;
            padding: 6px 18px;
            min-width: auto;
        }
        .bottom-tab .tab-item.nav-cta-tab i {
            color: var(--secondary);
        }
        .bottom-tab .tab-item.nav-cta-tab:hover {
            background: var(--primary-light);
            color: #fff;
        }

        /* ===== Hero / 分类页横幅 ===== */
        .category-hero {
            margin-top: var(--header-h);
            position: relative;
            min-height: 340px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
            overflow: hidden;
            padding: 60px 0;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.2;
            mix-blend-mode: overlay;
        }
        .category-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(212, 160, 42, 0.15) 0%, transparent 70%);
            pointer-events: none;
        }
        .category-hero .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 800px;
            padding: 0 24px;
        }
        .category-hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(212, 160, 42, 0.18);
            color: var(--secondary-light);
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 20px;
            border: 1px solid rgba(212, 160, 42, 0.25);
            backdrop-filter: blur(4px);
        }
        .category-hero .hero-badge i {
            font-size: 0.9rem;
        }
        .category-hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 16px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }
        .category-hero h1 span {
            color: var(--secondary);
        }
        .category-hero p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 640px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }
        .category-hero .hero-stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
            margin-top: 12px;
        }
        .category-hero .hero-stats .stat-item {
            text-align: center;
        }
        .category-hero .hero-stats .stat-num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--secondary);
            display: block;
        }
        .category-hero .hero-stats .stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-section-alt);
        }
        .section-dark {
            background: var(--bg-dark);
            color: #fff;
        }
        .section-title {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-title h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary-dark);
            margin-bottom: 12px;
            position: relative;
            display: inline-block;
        }
        .section-title h2::after {
            content: '';
            display: block;
            width: 50px;
            height: 4px;
            background: var(--secondary);
            border-radius: 4px;
            margin: 12px auto 0;
        }
        .section-title p {
            font-size: 1.05rem;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
        }
        .section-dark .section-title h2 {
            color: #fff;
        }
        .section-dark .section-title p {
            color: rgba(255, 255, 255, 0.7);
        }

        /* ===== 分类介绍板块 ===== */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        .intro-grid .intro-image {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            position: relative;
        }
        .intro-grid .intro-image img {
            width: 100%;
            height: 360px;
            object-fit: cover;
            transition: var(--transition);
        }
        .intro-grid .intro-image:hover img {
            transform: scale(1.03);
        }
        .intro-grid .intro-image .img-tag {
            position: absolute;
            top: 16px;
            left: 16px;
            background: var(--secondary);
            color: var(--primary-dark);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
        }
        .intro-grid .intro-text h3 {
            font-size: 1.8rem;
            margin-bottom: 16px;
            color: var(--primary);
        }
        .intro-grid .intro-text p {
            color: var(--text-light);
            margin-bottom: 16px;
            line-height: 1.8;
        }
        .intro-grid .intro-text .feature-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
            margin-top: 20px;
        }
        .intro-grid .intro-text .feature-list li {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.95rem;
            color: var(--text);
        }
        .intro-grid .intro-text .feature-list li i {
            color: var(--secondary);
            font-size: 0.85rem;
        }

        /* ===== 分类卡片网格 ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }
        .category-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border);
            display: flex;
            flex-direction: column;
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow);
            border-color: var(--secondary);
        }
        .category-card .card-img {
            height: 180px;
            overflow: hidden;
            position: relative;
        }
        .category-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .category-card:hover .card-img img {
            transform: scale(1.06);
        }
        .category-card .card-img .card-badge {
            position: absolute;
            top: 14px;
            right: 14px;
            background: var(--primary);
            color: #fff;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        .category-card .card-body {
            padding: 22px 20px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .category-card .card-body .card-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: rgba(212, 160, 42, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--secondary);
            margin-bottom: 14px;
        }
        .category-card .card-body h3 {
            font-size: 1.2rem;
            margin-bottom: 8px;
            color: var(--primary);
        }
        .category-card .card-body p {
            font-size: 0.92rem;
            color: var(--text-light);
            line-height: 1.6;
            flex: 1;
        }
        .category-card .card-body .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-top: 16px;
        }
        .category-card .card-body .card-tags span {
            background: var(--bg-section-alt);
            padding: 4px 12px;
            border-radius: 16px;
            font-size: 0.75rem;
            color: var(--text-light);
            font-weight: 500;
        }

        /* ===== 精选平台展示 ===== */
        .platform-showcase {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .platform-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border);
        }
        .platform-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }
        .platform-card .pcard-img {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .platform-card .pcard-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .platform-card:hover .pcard-img img {
            transform: scale(1.05);
        }
        .platform-card .pcard-img .pcard-rank {
            position: absolute;
            top: 14px;
            left: 14px;
            background: var(--secondary);
            color: var(--primary-dark);
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 0.9rem;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
        }
        .platform-card .pcard-body {
            padding: 20px 20px 24px;
        }
        .platform-card .pcard-body h4 {
            font-size: 1.1rem;
            margin-bottom: 6px;
            color: var(--primary);
        }
        .platform-card .pcard-body .pcard-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        .platform-card .pcard-body .pcard-meta i {
            color: var(--secondary);
        }
        .platform-card .pcard-body p {
            font-size: 0.9rem;
            color: var(--text-light);
            line-height: 1.6;
        }
        .platform-card .pcard-body .pcard-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 16px;
            padding-top: 14px;
            border-top: 1px solid var(--border);
        }
        .platform-card .pcard-body .pcard-footer .rating {
            display: flex;
            align-items: center;
            gap: 4px;
            color: var(--secondary);
            font-weight: 600;
            font-size: 0.9rem;
        }
        .platform-card .pcard-body .pcard-footer .rating i {
            font-size: 0.8rem;
        }
        .platform-card .pcard-body .pcard-footer .tag {
            background: rgba(15, 43, 74, 0.08);
            padding: 4px 12px;
            border-radius: 16px;
            font-size: 0.75rem;
            color: var(--primary);
            font-weight: 500;
        }

        /* ===== 特点对比区块 ===== */
        .compare-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }
        .compare-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 32px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .compare-item:hover {
            box-shadow: var(--shadow);
            border-color: var(--secondary);
        }
        .compare-item .cmp-head {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 14px;
        }
        .compare-item .cmp-head .cmp-icon {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            background: rgba(212, 160, 42, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--secondary);
            flex-shrink: 0;
        }
        .compare-item .cmp-head h3 {
            font-size: 1.15rem;
            color: var(--primary);
        }
        .compare-item p {
            font-size: 0.92rem;
            color: var(--text-light);
            line-height: 1.7;
        }
        .compare-item .cmp-list {
            margin-top: 12px;
            display: grid;
            gap: 6px;
        }
        .compare-item .cmp-list li {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text);
        }
        .compare-item .cmp-list li i {
            color: var(--secondary);
            font-size: 0.8rem;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: grid;
            gap: 14px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--secondary);
        }
        .faq-item .faq-q {
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--primary);
            gap: 16px;
            user-select: none;
        }
        .faq-item .faq-q i {
            color: var(--secondary);
            font-size: 0.85rem;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-q i {
            transform: rotate(180deg);
        }
        .faq-item .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-a {
            max-height: 320px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .cta-content {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .btn-group {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .cta-section .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--secondary);
            color: var(--primary-dark);
            padding: 14px 36px;
            border-radius: 40px;
            font-weight: 700;
            font-size: 1.05rem;
            transition: var(--transition);
            box-shadow: 0 6px 24px rgba(212, 160, 42, 0.35);
            border: none;
            cursor: pointer;
        }
        .cta-section .btn-primary:hover {
            background: var(--secondary-light);
            transform: translateY(-3px);
            box-shadow: 0 10px 32px rgba(212, 160, 42, 0.45);
            color: var(--primary-dark);
        }
        .cta-section .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: #fff;
            padding: 14px 36px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 1.05rem;
            transition: var(--transition);
            border: 2px solid rgba(255, 255, 255, 0.3);
            cursor: pointer;
        }
        .cta-section .btn-outline:hover {
            border-color: var(--secondary);
            color: var(--secondary);
            background: rgba(212, 160, 42, 0.08);
            transform: translateY(-3px);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand .logo span {
            color: var(--secondary);
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            max-width: 360px;
        }
        .footer-col h5 {
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 8px;
        }
        .footer-col h5::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 28px;
            height: 2px;
            background: var(--secondary);
            border-radius: 2px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--secondary);
            transform: translateX(4px);
        }
        .footer-col ul li a i {
            font-size: 0.85rem;
            width: 18px;
            color: var(--secondary);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom span a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom span a:hover {
            color: var(--secondary);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .category-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .platform-showcase {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .intro-grid .intro-image img {
                height: 280px;
            }
            .category-hero h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-h: 64px;
            }
            .main-nav {
                display: none;
            }
            .menu-toggle {
                display: block;
            }
            .main-nav.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                padding: 16px 24px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow);
                gap: 4px;
            }
            .main-nav.open a {
                padding: 12px 16px;
                border-radius: var(--radius-sm);
            }
            .main-nav.open a.active::after {
                display: none;
            }
            .main-nav.open a.nav-cta {
                margin-top: 8px;
                text-align: center;
                justify-content: center;
            }
            .bottom-tab {
                display: block;
            }
            .site-footer {
                padding-bottom: 70px;
            }

            .category-hero {
                min-height: 280px;
                padding: 40px 0;
            }
            .category-hero h1 {
                font-size: 1.8rem;
            }
            .category-hero p {
                font-size: 0.95rem;
            }
            .category-hero .hero-stats {
                gap: 20px;
            }
            .category-hero .hero-stats .stat-num {
                font-size: 1.4rem;
            }

            .section {
                padding: 56px 0;
            }
            .section-title h2 {
                font-size: 1.6rem;
            }
            .section-title p {
                font-size: 0.95rem;
            }

            .category-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .category-card .card-img {
                height: 140px;
            }
            .category-card .card-body {
                padding: 16px 14px 18px;
            }
            .category-card .card-body h3 {
                font-size: 1rem;
            }

            .platform-showcase {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .platform-card .pcard-img {
                height: 180px;
            }

            .compare-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .compare-item {
                padding: 24px 20px;
            }

            .intro-grid .intro-text h3 {
                font-size: 1.4rem;
            }
            .intro-grid .intro-text .feature-list {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .cta-section h2 {
                font-size: 1.6rem;
            }
            .cta-section .btn-primary,
            .cta-section .btn-outline {
                padding: 12px 28px;
                font-size: 0.95rem;
            }

            .faq-item .faq-q {
                padding: 14px 18px;
                font-size: 0.95rem;
            }
            .faq-item .faq-a {
                font-size: 0.9rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .category-hero h1 {
                font-size: 1.5rem;
            }
            .category-grid {
                grid-template-columns: 1fr;
            }
            .category-card .card-img {
                height: 180px;
            }
            .section-title h2 {
                font-size: 1.4rem;
            }
            .logo {
                font-size: 1.2rem;
            }
            .logo .logo-icon {
                width: 34px;
                height: 34px;
                font-size: 1rem;
            }
            .bottom-tab .tab-item {
                padding: 6px 10px;
                font-size: 0.65rem;
                min-width: 48px;
            }
            .bottom-tab .tab-item i {
                font-size: 1rem;
            }
        }

        /* ===== 辅助 ===== */
        .text-center {
            text-align: center;
        }
        .mt-20 {
            margin-top: 20px;
        }
        .mb-20 {
            margin-bottom: 20px;
        }
        .gap-8 {
            gap: 8px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }