/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #3b82f6;
            --primary-dark: #2563eb;
            --primary-light: #60a5fa;
            --primary-bg: #eff6ff;
            --secondary: #f59e0b;
            --secondary-dark: #d97706;
            --secondary-light: #fbbf24;
            --accent: #8b5cf6;
            --dark: #0b1120;
            --dark-soft: #131c31;
            --dark-mid: #1e293b;
            --light: #f8fafc;
            --gray-50: #f1f5f9;
            --gray-100: #e2e8f0;
            --gray-200: #cbd5e1;
            --gray-300: #94a3b8;
            --gray-400: #64748b;
            --gray-500: #475569;
            --text: #0f172a;
            --text-light: #64748b;
            --text-inverse: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow: 0 4px 16px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.12), 0 6px 24px rgba(0,0,0,0.06);
            --shadow-xl: 0 24px 64px rgba(0,0,0,0.16);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
            --nav-sub-height: 52px;
        }

        /* ===== 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);
            font-size: 16px;
            line-height: 1.65;
            color: var(--text);
            background: var(--light);
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        button { cursor: pointer; font-family: inherit; border: none; background: none; }
        input, textarea { font-family: inherit; outline: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--dark); }
        h1 { font-size: 2.75rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.375rem; }
        h4 { font-size: 1.125rem; }
        p { margin-bottom: 0.75rem; color: var(--text-light); }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section { padding: 80px 0; }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 2rem;
            margin-bottom: 12px;
            color: var(--dark);
        }
        .section-title p {
            font-size: 1.1rem;
            color: var(--text-light);
            max-width: 620px;
            margin: 0 auto;
        }
        .section-title .badge {
            display: inline-block;
            background: var(--primary-bg);
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 4px 16px;
            border-radius: 20px;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .text-center { text-align: center; }
        .mt-2 { margin-top: 8px; }
        .mt-4 { margin-top: 16px; }
        .mt-6 { margin-top: 24px; }
        .mt-8 { margin-top: 32px; }
        .mb-4 { margin-bottom: 16px; }
        .mb-6 { margin-bottom: 24px; }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: var(--radius-sm);
            transition: all 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: 0 8px 24px rgba(59,130,246,0.35);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 4px 12px rgba(59,130,246,0.25);
        }
        .btn-secondary {
            background: transparent;
            color: var(--text-inverse);
            border-color: rgba(255,255,255,0.3);
        }
        .btn-secondary:hover {
            background: rgba(255,255,255,0.1);
            border-color: rgba(255,255,255,0.5);
            transform: translateY(-2px);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(59,130,246,0.25);
        }
        .btn-lg { padding: 16px 36px; font-size: 1.1rem; border-radius: var(--radius); }
        .btn-sm { padding: 8px 18px; font-size: 0.875rem; }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 14px;
            font-size: 0.8rem;
            font-weight: 600;
            border-radius: 20px;
            background: var(--gray-100);
            color: var(--gray-500);
        }
        .badge-primary {
            background: var(--primary-bg);
            color: var(--primary);
        }
        .badge-warning {
            background: #fef3c7;
            color: #b45309;
        }
        .badge-success {
            background: #d1fae5;
            color: #047857;
        }

        /* ===== Cards ===== */
        .card {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            overflow: hidden;
            border: 1px solid var(--border);
        }
        .card:hover {
            box-shadow: var(--shadow);
            transform: translateY(-4px);
            border-color: var(--primary-light);
        }
        .card-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
        .card-body { padding: 20px 24px 24px; }
        .card-body h3 { font-size: 1.15rem; margin-bottom: 8px; color: var(--dark); }
        .card-body p { font-size: 0.95rem; color: var(--text-light); margin-bottom: 0; }
        .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.85rem;
            color: var(--gray-400);
            margin-top: 12px;
            flex-wrap: wrap;
        }
        .card-meta span { display: inline-flex; align-items: center; gap: 4px; }

        /* ===== Grid ===== */
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

        /* ===== Header / 双层导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(11,17,32,0.96);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            transition: background var(--transition);
        }
        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            padding: 0 24px;
            max-width: var(--max-width);
            margin: 0 auto;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.3px;
        }
        .logo i { color: var(--secondary); font-size: 1.6rem; }
        .logo span { background: linear-gradient(135deg, #fff 60%, var(--primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .logo .logo-sub {
            font-size: 0.7rem;
            font-weight: 400;
            color: var(--gray-400);
            letter-spacing: 0.5px;
            -webkit-text-fill-color: var(--gray-400);
            background: none;
            margin-left: 2px;
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .header-actions .search-box {
            display: flex;
            align-items: center;
            background: rgba(255,255,255,0.08);
            border-radius: 8px;
            padding: 0 14px;
            border: 1px solid rgba(255,255,255,0.1);
            transition: all var(--transition);
        }
        .header-actions .search-box:focus-within {
            background: rgba(255,255,255,0.14);
            border-color: var(--primary-light);
        }
        .header-actions .search-box input {
            background: none;
            border: none;
            padding: 8px 0;
            font-size: 0.9rem;
            color: #fff;
            width: 160px;
        }
        .header-actions .search-box input::placeholder { color: var(--gray-400); }
        .header-actions .search-box button { color: var(--gray-400); padding: 8px 4px; font-size: 0.95rem; }
        .header-actions .search-box button:hover { color: var(--primary-light); }
        .header-actions .btn-header-cta {
            background: var(--primary);
            color: #fff;
            padding: 8px 20px;
            border-radius: 8px;
            font-size: 0.85rem;
            font-weight: 600;
            transition: all var(--transition);
        }
        .header-actions .btn-header-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(59,130,246,0.35);
        }

        /* 导航底层 - 频道Tabs */
        .nav-sub {
            background: rgba(255,255,255,0.03);
            border-top: 1px solid rgba(255,255,255,0.05);
            height: var(--nav-sub-height);
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }
        .nav-sub::-webkit-scrollbar { display: none; }
        .nav-sub-inner {
            display: flex;
            align-items: center;
            gap: 4px;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
        }
        .nav-sub a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 20px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--gray-300);
            border-radius: 20px;
            transition: all var(--transition);
            white-space: nowrap;
            border: 1px solid transparent;
        }
        .nav-sub a i { font-size: 0.85rem; }
        .nav-sub a:hover { color: #fff; background: rgba(255,255,255,0.08); }
        .nav-sub a.active {
            color: #fff;
            background: var(--primary);
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(59,130,246,0.3);
        }
        .nav-sub a.active i { color: rgba(255,255,255,0.9); }

        /* 移动端菜单按钮 */
        .menu-toggle { display: none; background: none; color: #fff; font-size: 1.4rem; padding: 4px; }

        /* ===== Hero ===== */
        .hero {
            padding-top: calc(var(--header-height) + var(--nav-sub-height) + 20px);
            padding-bottom: 80px;
            min-height: 580px;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            background: var(--dark);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.3;
            z-index: 0;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11,17,32,0.92) 0%, rgba(11,17,32,0.6) 60%, rgba(59,130,246,0.15) 100%);
            z-index: 1;
        }
        .hero .container { position: relative; z-index: 2; }
        .hero-content { max-width: 780px; }
        .hero-content .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.08);
            border: 1px solid rgba(255,255,255,0.12);
            padding: 6px 18px;
            border-radius: 20px;
            font-size: 0.85rem;
            color: var(--gray-200);
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }
        .hero-content .hero-badge i { color: var(--secondary); }
        .hero-content h1 {
            font-size: 3rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero-content h1 .highlight { background: linear-gradient(135deg, var(--primary-light), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero-content p {
            font-size: 1.15rem;
            color: var(--gray-300);
            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(255,255,255,0.08);
        }
        .hero-stats .stat-item h3 { font-size: 1.6rem; color: #fff; font-weight: 700; }
        .hero-stats .stat-item p { font-size: 0.85rem; color: var(--gray-400); margin-bottom: 0; }

        /* ===== Features ===== */
        .features { background: #fff; }
        .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .feature-card {
            background: var(--light);
            border-radius: var(--radius);
            padding: 36px 28px;
            text-align: center;
            transition: all var(--transition);
            border: 1px solid var(--border);
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
            background: #fff;
        }
        .feature-card .icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 20px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: #fff;
        }
        .feature-card .icon.icon-blue { background: linear-gradient(135deg, #3b82f6, #2563eb); }
        .feature-card .icon.icon-amber { background: linear-gradient(135deg, #f59e0b, #d97706); }
        .feature-card .icon.icon-purple { background: linear-gradient(135deg, #8b5cf6, #6d28d9); }
        .feature-card h3 { font-size: 1.2rem; margin-bottom: 10px; color: var(--dark); }
        .feature-card p { font-size: 0.95rem; color: var(--text-light); margin-bottom: 0; }

        /* ===== Category Section ===== */
        .category-section { background: var(--gray-50); }
        .category-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
        .category-card {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: flex-end;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .category-card .cat-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            transition: transform 0.5s ease;
        }
        .category-card:hover .cat-bg { transform: scale(1.05); }
        .category-card .cat-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(11,17,32,0.85) 0%, rgba(11,17,32,0.2) 70%, transparent 100%);
            z-index: 1;
        }
        .category-card .cat-body {
            position: relative;
            z-index: 2;
            padding: 32px 28px;
            color: #fff;
            width: 100%;
        }
        .category-card .cat-body h3 { font-size: 1.4rem; color: #fff; margin-bottom: 6px; }
        .category-card .cat-body p { font-size: 0.95rem; color: rgba(255,255,255,0.75); margin-bottom: 12px; }
        .category-card .cat-body .btn { font-size: 0.85rem; padding: 8px 20px; }

        /* ===== Latest Posts ===== */
        .latest-posts { background: #fff; }
        .posts-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .post-card .card-body .post-excerpt {
            font-size: 0.9rem;
            color: var(--text-light);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 0;
        }
        .post-card .card-img-wrap {
            position: relative;
            overflow: hidden;
        }
        .post-card .card-img-wrap .card-img { transition: transform 0.5s ease; }
        .post-card:hover .card-img-wrap .card-img { transform: scale(1.05); }
        .post-card .card-img-wrap .cat-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--primary);
            color: #fff;
            padding: 3px 12px;
            border-radius: 6px;
            font-size: 0.75rem;
            font-weight: 600;
        }
        .empty-posts {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 20px;
            color: var(--text-light);
            background: var(--gray-50);
            border-radius: var(--radius);
            font-size: 1rem;
        }
        .empty-posts i { font-size: 2rem; color: var(--gray-300); margin-bottom: 12px; display: block; }

        /* ===== Process / Flow ===== */
        .process-section { background: var(--dark); color: #fff; }
        .process-section .section-title h2 { color: #fff; }
        .process-section .section-title p { color: var(--gray-300); }
        .process-section .section-title .badge { background: rgba(255,255,255,0.1); color: var(--primary-light); }
        .process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
        .process-step {
            text-align: center;
            padding: 32px 16px;
            background: rgba(255,255,255,0.04);
            border-radius: var(--radius);
            border: 1px solid rgba(255,255,255,0.06);
            transition: all var(--transition);
            position: relative;
        }
        .process-step:hover {
            background: rgba(255,255,255,0.08);
            transform: translateY(-4px);
        }
        .process-step .step-num {
            width: 48px;
            height: 48px;
            margin: 0 auto 16px;
            background: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
        }
        .process-step h4 { font-size: 1.05rem; color: #fff; margin-bottom: 8px; }
        .process-step p { font-size: 0.85rem; color: var(--gray-400); margin-bottom: 0; }
        .process-step .step-connector {
            display: none;
        }
        @media (min-width: 1024px) {
            .process-step { position: relative; }
            .process-step:not(:last-child)::after {
                content: '→';
                position: absolute;
                right: -18px;
                top: 50%;
                transform: translateY(-50%);
                font-size: 1.4rem;
                color: var(--gray-500);
                font-weight: 300;
            }
        }

        /* ===== FAQ ===== */
        .faq-section { background: var(--gray-50); }
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item {
            background: #fff;
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--dark);
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            gap: 16px;
        }
        .faq-question i { color: var(--primary); font-size: 0.9rem; transition: transform var(--transition); }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--dark);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.12;
            z-index: 0;
        }
        .cta-section .container { position: relative; z-index: 1; text-align: center; }
        .cta-section h2 { color: #fff; font-size: 2rem; margin-bottom: 16px; }
        .cta-section p { color: var(--gray-300); font-size: 1.1rem; max-width: 560px; margin: 0 auto 32px; }
        .cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--dark-soft);
            border-top: 1px solid rgba(255,255,255,0.06);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .footer-brand .logo { margin-bottom: 16px; }
        .footer-brand p { font-size: 0.9rem; color: var(--gray-400); max-width: 340px; line-height: 1.7; }
        .footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: var(--gray-400); font-size: 0.9rem; transition: color var(--transition); }
        .footer-col ul li a:hover { color: var(--primary-light); }
        .footer-col ul li a i { width: 18px; margin-right: 6px; color: var(--gray-500); }
        .footer-bottom {
            padding: 24px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom p { font-size: 0.85rem; color: var(--gray-500); margin-bottom: 0; }
        .footer-bottom .footer-links { display: flex; gap: 24px; }
        .footer-bottom .footer-links a { font-size: 0.85rem; color: var(--gray-500); }
        .footer-bottom .footer-links a:hover { color: var(--primary-light); }
        .footer-social { display: flex; gap: 12px; }
        .footer-social a {
            width: 36px; height: 36px;
            border-radius: 8px;
            background: rgba(255,255,255,0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--gray-400);
            transition: all var(--transition);
        }
        .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            h1 { font-size: 2.25rem; }
            h2 { font-size: 1.75rem; }
            .hero-content h1 { font-size: 2.5rem; }
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
            .process-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
            .process-step:not(:last-child)::after { display: none; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
        }

        @media (max-width: 768px) {
            .container { padding: 0 16px; }
            .section { padding: 56px 0; }
            .hero { padding-top: calc(var(--header-height) + var(--nav-sub-height) + 16px); padding-bottom: 48px; min-height: 460px; }
            .hero-content h1 { font-size: 1.8rem; }
            .hero-content p { font-size: 1rem; }
            .hero-stats { gap: 24px; flex-wrap: wrap; }
            .hero-stats .stat-item h3 { font-size: 1.3rem; }
            .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; gap: 20px; }
            .features-grid { grid-template-columns: 1fr; gap: 20px; }
            .category-grid { grid-template-columns: 1fr; gap: 20px; }
            .posts-grid { grid-template-columns: 1fr; gap: 20px; }
            .process-grid { grid-template-columns: 1fr; gap: 16px; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }

            .header-actions .search-box { display: none; }
            .menu-toggle { display: block; }
            .nav-sub { overflow-x: auto; }
            .nav-sub a { font-size: 0.8rem; padding: 5px 14px; }

            .section-title h2 { font-size: 1.5rem; }
            .section-title p { font-size: 0.95rem; }

            .footer-bottom { flex-direction: column; text-align: center; }
            .footer-bottom .footer-links { justify-content: center; }

            .faq-question { font-size: 0.95rem; padding: 14px 18px; }
            .faq-answer { font-size: 0.9rem; padding: 0 18px; }
            .faq-item.active .faq-answer { padding: 0 18px 16px; }

            .process-step { padding: 24px 16px; }
            .process-step:not(:last-child)::after { display: none; }

            .feature-card { padding: 28px 20px; }
            .category-card { min-height: 220px; }
            .category-card .cat-body { padding: 24px 20px; }

            .cta-section h2 { font-size: 1.5rem; }
            .cta-section p { font-size: 0.95rem; }
        }

        @media (max-width: 520px) {
            .hero-content h1 { font-size: 1.5rem; }
            .btn-lg { padding: 12px 24px; font-size: 0.95rem; }
            .hero-actions .btn { font-size: 0.85rem; padding: 10px 20px; }
            .header-actions .btn-header-cta { display: none; }
            .logo { font-size: 1.1rem; }
            .logo .logo-sub { display: none; }
            .hero-stats { gap: 16px; }
            .hero-stats .stat-item h3 { font-size: 1.1rem; }
        }

        /* ===== Focus / Accessibility ===== */
        a:focus-visible, button:focus-visible, input:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
        }
        .card:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* roulang page: category1 */
:root {
        --primary: #6c5ce7;
        --primary-dark: #5a4bd1;
        --primary-light: #a29bfe;
        --secondary: #fd79a8;
        --accent: #00cec9;
        --bg-dark: #0f0e1a;
        --bg-card: #1a1a2e;
        --bg-card-hover: #222240;
        --bg-section: #13122a;
        --bg-light: #f8f7ff;
        --text-light: #f0edff;
        --text-muted: #9b97b8;
        --text-body: #e0dcf0;
        --border-color: #2d2b50;
        --border-radius: 16px;
        --border-radius-sm: 10px;
        --shadow-sm: 0 4px 20px rgba(108,92,231,0.12);
        --shadow-md: 0 8px 40px rgba(108,92,231,0.18);
        --shadow-lg: 0 16px 60px rgba(108,92,231,0.25);
        --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
        --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
        --container-max: 1200px;
        --header-z: 100;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
    body {
        font-family: var(--font-sans);
        font-size: 16px;
        line-height: 1.7;
        color: var(--text-body);
        background: var(--bg-dark);
        min-height: 100vh;
        overflow-x: hidden;
    }
    a { color: var(--primary-light); text-decoration: none; transition: var(--transition); }
    a:hover { color: #fff; }
    img { max-width: 100%; height: auto; display: block; }
    button, input { font-family: inherit; font-size: 1rem; border: none; outline: none; }
    ul { list-style: none; }
    .container {
        width: 100%;
        max-width: var(--container-max);
        margin: 0 auto;
        padding: 0 24px;
    }
    .container-fluid { width: 100%; padding: 0 24px; }

    /* Header */
    .site-header {
        background: rgba(15,14,26,0.96);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border-color);
        position: sticky;
        top: 0;
        z-index: var(--header-z);
    }
    .header-top {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 12px 24px;
        max-width: var(--container-max);
        margin: 0 auto;
        gap: 16px;
    }
    .logo {
        display: flex;
        align-items: center;
        gap: 8px;
        color: #fff;
        font-size: 1.4rem;
        font-weight: 700;
        letter-spacing: 0.5px;
        flex-shrink: 0;
    }
    .logo i { color: var(--primary-light); font-size: 1.6rem; }
    .logo span { color: #fff; }
    .logo .logo-sub {
        font-size: 0.75rem;
        font-weight: 400;
        color: var(--text-muted);
        background: rgba(255,255,255,0.06);
        padding: 2px 10px;
        border-radius: 20px;
        letter-spacing: 0.3px;
        margin-left: 2px;
    }
    .header-actions {
        display: flex;
        align-items: center;
        gap: 12px;
    }
    .search-box {
        display: flex;
        align-items: center;
        background: rgba(255,255,255,0.06);
        border: 1px solid var(--border-color);
        border-radius: 30px;
        padding: 0 4px 0 16px;
        transition: var(--transition);
    }
    .search-box:focus-within { border-color: var(--primary-light); background: rgba(108,92,231,0.08); }
    .search-box input {
        background: transparent;
        color: var(--text-light);
        padding: 8px 8px;
        width: 160px;
        font-size: 0.9rem;
    }
    .search-box input::placeholder { color: var(--text-muted); }
    .search-box button {
        background: var(--primary);
        color: #fff;
        width: 34px;
        height: 34px;
        border-radius: 50%;
        cursor: pointer;
        transition: var(--transition);
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .search-box button:hover { background: var(--primary-dark); transform: scale(1.05); }
    .btn-header-cta {
        background: linear-gradient(135deg, var(--primary), var(--secondary));
        color: #fff;
        padding: 8px 20px;
        border-radius: 30px;
        font-size: 0.85rem;
        font-weight: 600;
        display: flex;
        align-items: center;
        gap: 6px;
        transition: var(--transition);
        white-space: nowrap;
    }
    .btn-header-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(108,92,231,0.35); color: #fff; }
    .menu-toggle { display: none; background: transparent; color: var(--text-light); font-size: 1.4rem; cursor: pointer; padding: 4px 8px; }

    /* Nav Sub */
    .nav-sub {
        border-top: 1px solid var(--border-color);
        background: rgba(15,14,26,0.9);
    }
    .nav-sub-inner {
        display: flex;
        align-items: center;
        gap: 4px;
        max-width: var(--container-max);
        margin: 0 auto;
        padding: 0 24px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }
    .nav-sub-inner::-webkit-scrollbar { display: none; }
    .nav-sub-inner a {
        display: flex;
        align-items: center;
        gap: 6px;
        padding: 12px 18px;
        color: var(--text-muted);
        font-size: 0.9rem;
        font-weight: 500;
        border-bottom: 2px solid transparent;
        white-space: nowrap;
        transition: var(--transition);
        flex-shrink: 0;
    }
    .nav-sub-inner a i { font-size: 0.9rem; }
    .nav-sub-inner a:hover { color: var(--text-light); background: rgba(255,255,255,0.03); }
    .nav-sub-inner a.active {
        color: var(--primary-light);
        border-bottom-color: var(--primary-light);
        background: rgba(108,92,231,0.06);
    }

    /* Page Banner */
    .page-banner {
        position: relative;
        padding: 80px 0 60px;
        background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
        isolation: isolate;
        overflow: hidden;
    }
    .page-banner::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(15,14,26,0.92) 0%, rgba(108,92,231,0.35) 100%);
        z-index: 1;
    }
    .page-banner .container { position: relative; z-index: 2; text-align: center; }
    .page-banner h1 {
        font-size: 3rem;
        font-weight: 800;
        color: #fff;
        margin-bottom: 16px;
        letter-spacing: -0.5px;
        line-height: 1.2;
    }
    .page-banner h1 i { color: var(--primary-light); margin-right: 10px; }
    .page-banner p {
        font-size: 1.1rem;
        color: var(--text-muted);
        max-width: 600px;
        margin: 0 auto 20px;
        line-height: 1.7;
    }
    .banner-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        justify-content: center;
        margin-top: 12px;
    }
    .banner-tags span {
        background: rgba(255,255,255,0.08);
        backdrop-filter: blur(4px);
        color: var(--text-light);
        padding: 6px 18px;
        border-radius: 30px;
        font-size: 0.85rem;
        border: 1px solid rgba(255,255,255,0.06);
    }
    .banner-tags span i { margin-right: 6px; color: var(--primary-light); }

    /* Section */
    .section {
        padding: 80px 0;
    }
    .section-header {
        text-align: center;
        margin-bottom: 48px;
    }
    .section-header h2 {
        font-size: 2.2rem;
        font-weight: 700;
        color: #fff;
        margin-bottom: 12px;
        letter-spacing: -0.3px;
    }
    .section-header h2 i { color: var(--primary-light); margin-right: 8px; }
    .section-header p {
        color: var(--text-muted);
        max-width: 560px;
        margin: 0 auto;
        font-size: 1.05rem;
    }
    .section-header .badge-line {
        display: inline-block;
        background: rgba(108,92,231,0.15);
        color: var(--primary-light);
        padding: 4px 18px;
        border-radius: 30px;
        font-size: 0.8rem;
        font-weight: 600;
        letter-spacing: 1px;
        margin-bottom: 12px;
        border: 1px solid rgba(108,92,231,0.2);
    }

    /* Game Grid */
    .game-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
        gap: 24px;
    }
    .game-card {
        background: var(--bg-card);
        border-radius: var(--border-radius);
        overflow: hidden;
        border: 1px solid var(--border-color);
        transition: var(--transition);
        display: flex;
        flex-direction: column;
    }
    .game-card:hover { transform: translateY(-6px); border-color: var(--primary); box-shadow: var(--shadow-md); background: var(--bg-card-hover); }
    .game-card .card-img {
        position: relative;
        aspect-ratio: 16 / 9;
        overflow: hidden;
        background: #1a1a2e;
    }
    .game-card .card-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.5s ease;
    }
    .game-card:hover .card-img img { transform: scale(1.05); }
    .game-card .card-badge {
        position: absolute;
        top: 12px;
        left: 12px;
        background: var(--primary);
        color: #fff;
        padding: 4px 14px;
        border-radius: 30px;
        font-size: 0.75rem;
        font-weight: 600;
        display: flex;
        align-items: center;
        gap: 4px;
        box-shadow: 0 4px 15px rgba(108,92,231,0.3);
    }
    .game-card .card-badge.top { background: linear-gradient(135deg, #f093fb, #f5576c); }
    .game-card .card-body {
        padding: 18px 20px 20px;
        flex: 1;
        display: flex;
        flex-direction: column;
    }
    .game-card .card-body h3 {
        font-size: 1.1rem;
        font-weight: 600;
        color: #fff;
        margin-bottom: 6px;
        line-height: 1.4;
    }
    .game-card .card-body .meta {
        display: flex;
        align-items: center;
        gap: 12px;
        font-size: 0.8rem;
        color: var(--text-muted);
        margin-bottom: 10px;
    }
    .game-card .card-body .meta span { display: flex; align-items: center; gap: 4px; }
    .game-card .card-body .desc {
        font-size: 0.88rem;
        color: var(--text-muted);
        line-height: 1.6;
        flex: 1;
        margin-bottom: 14px;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .game-card .card-body .btn-download {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        background: var(--primary);
        color: #fff;
        padding: 8px 20px;
        border-radius: 30px;
        font-size: 0.85rem;
        font-weight: 600;
        align-self: flex-start;
        transition: var(--transition);
    }
    .game-card .card-body .btn-download:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(108,92,231,0.3); color: #fff; }

    /* Rank highlight */
    .rank-number {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 32px;
        height: 32px;
        border-radius: 50%;
        background: rgba(108,92,231,0.15);
        color: var(--primary-light);
        font-weight: 700;
        font-size: 0.9rem;
        margin-right: 8px;
        flex-shrink: 0;
    }
    .rank-number.top1 { background: linear-gradient(135deg, #f093fb, #f5576c); color: #fff; }
    .rank-number.top2 { background: linear-gradient(135deg, #4facfe, #00f2fe); color: #fff; }
    .rank-number.top3 { background: linear-gradient(135deg, #fa709a, #fee140); color: #fff; }

    /* Features Strip */
    .features-strip {
        background: var(--bg-section);
        border-top: 1px solid var(--border-color);
        border-bottom: 1px solid var(--border-color);
        padding: 60px 0;
    }
    .features-strip .grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 32px;
        text-align: center;
    }
    .features-strip .item { padding: 20px; }
    .features-strip .item .icon {
        width: 64px;
        height: 64px;
        border-radius: 50%;
        background: rgba(108,92,231,0.1);
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 16px;
        font-size: 1.6rem;
        color: var(--primary-light);
        transition: var(--transition);
    }
    .features-strip .item:hover .icon { background: var(--primary); color: #fff; transform: scale(1.1); }
    .features-strip .item h4 { font-size: 1.05rem; font-weight: 600; color: #fff; margin-bottom: 6px; }
    .features-strip .item p { font-size: 0.88rem; color: var(--text-muted); }

    /* Category List (图文列表) */
    .category-list { display: flex; flex-direction: column; gap: 28px; }
    .category-list .list-item {
        display: flex;
        gap: 24px;
        background: var(--bg-card);
        border-radius: var(--border-radius);
        padding: 20px;
        border: 1px solid var(--border-color);
        transition: var(--transition);
        align-items: flex-start;
    }
    .category-list .list-item:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); background: var(--bg-card-hover); }
    .category-list .list-item .thumb {
        width: 180px;
        min-height: 120px;
        border-radius: var(--border-radius-sm);
        overflow: hidden;
        flex-shrink: 0;
        background: #1a1a2e;
    }
    .category-list .list-item .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
    .category-list .list-item:hover .thumb img { transform: scale(1.04); }
    .category-list .list-item .info { flex: 1; }
    .category-list .list-item .info h3 { font-size: 1.15rem; font-weight: 600; color: #fff; margin-bottom: 6px; }
    .category-list .list-item .info .meta { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 8px; display: flex; gap: 16px; flex-wrap: wrap; }
    .category-list .list-item .info .meta span { display: flex; align-items: center; gap: 4px; }
    .category-list .list-item .info p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
    .category-list .list-item .info .btn-sm {
        display: inline-flex;
        align-items: center;
        gap: 4px;
        margin-top: 10px;
        padding: 6px 18px;
        background: rgba(108,92,231,0.12);
        color: var(--primary-light);
        border-radius: 30px;
        font-size: 0.8rem;
        font-weight: 600;
        transition: var(--transition);
        border: 1px solid rgba(108,92,231,0.15);
    }
    .category-list .list-item .info .btn-sm:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

    /* FAQ */
    .faq-grid {
        display: grid;
        gap: 16px;
        max-width: 780px;
        margin: 0 auto;
    }
    .faq-item {
        background: var(--bg-card);
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius-sm);
        padding: 20px 24px;
        transition: var(--transition);
        cursor: pointer;
    }
    .faq-item:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); }
    .faq-item .question {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        font-weight: 600;
        color: #fff;
        font-size: 1rem;
    }
    .faq-item .question i { color: var(--primary-light); font-size: 0.9rem; transition: var(--transition); }
    .faq-item.open .question i { transform: rotate(180deg); }
    .faq-item .answer {
        margin-top: 12px;
        color: var(--text-muted);
        font-size: 0.92rem;
        line-height: 1.7;
        display: none;
    }
    .faq-item.open .answer { display: block; }

    /* CTA */
    .cta-section {
        background: linear-gradient(135deg, var(--bg-section) 0%, rgba(108,92,231,0.08) 100%);
        border-top: 1px solid var(--border-color);
        border-bottom: 1px solid var(--border-color);
        padding: 70px 0;
        text-align: center;
    }
    .cta-section h2 { font-size: 2rem; font-weight: 700; color: #fff; margin-bottom: 12px; }
    .cta-section p { color: var(--text-muted); max-width: 520px; margin: 0 auto 28px; font-size: 1.05rem; }
    .cta-section .btn-cta {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        background: linear-gradient(135deg, var(--primary), var(--secondary));
        color: #fff;
        padding: 14px 40px;
        border-radius: 50px;
        font-size: 1.05rem;
        font-weight: 700;
        transition: var(--transition);
        box-shadow: 0 8px 30px rgba(108,92,231,0.25);
    }
    .cta-section .btn-cta:hover { transform: translateY(-4px); box-shadow: 0 14px 50px rgba(108,92,231,0.35); color: #fff; }

    /* Footer */
    .site-footer {
        background: var(--bg-card);
        border-top: 1px solid var(--border-color);
        padding: 56px 0 20px;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 40px;
        margin-bottom: 32px;
    }
    .footer-brand .logo { margin-bottom: 16px; }
    .footer-brand p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; max-width: 360px; }
    .footer-social { display: flex; gap: 12px; }
    .footer-social a {
        width: 38px;
        height: 38px;
        border-radius: 50%;
        background: rgba(255,255,255,0.04);
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--text-muted);
        font-size: 1.1rem;
        transition: var(--transition);
    }
    .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-3px); }
    .footer-col h4 { font-size: 1rem; font-weight: 600; color: #fff; margin-bottom: 16px; letter-spacing: 0.3px; }
    .footer-col ul li { margin-bottom: 10px; }
    .footer-col ul li a {
        font-size: 0.88rem;
        color: var(--text-muted);
        display: flex;
        align-items: center;
        gap: 6px;
        transition: var(--transition);
    }
    .footer-col ul li a i { font-size: 0.6rem; color: var(--primary-light); }
    .footer-col ul li a:hover { color: #fff; padding-left: 4px; }
    .footer-bottom {
        border-top: 1px solid var(--border-color);
        padding-top: 20px;
        text-align: center;
        font-size: 0.82rem;
        color: var(--text-muted);
    }
    .footer-bottom a { color: var(--primary-light); }
    .footer-bottom a:hover { color: #fff; }

    /* Responsive */
    @media (max-width: 1024px) {
        .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        .game-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
    }
    @media (max-width: 768px) {
        .header-top { padding: 10px 16px; flex-wrap: wrap; }
        .search-box input { width: 100px; }
        .btn-header-cta { padding: 6px 14px; font-size: 0.78rem; }
        .menu-toggle { display: block; }
        .nav-sub { display: none; }
        .nav-sub.open { display: block; }
        .nav-sub-inner { flex-direction: column; padding: 8px 16px; }
        .nav-sub-inner a { width: 100%; border-bottom: none; border-left: 2px solid transparent; padding: 10px 16px; }
        .nav-sub-inner a.active { border-left-color: var(--primary-light); border-bottom: none; }
        .page-banner { padding: 60px 0 40px; }
        .page-banner h1 { font-size: 2rem; }
        .page-banner p { font-size: 0.95rem; }
        .section { padding: 48px 0; }
        .section-header h2 { font-size: 1.7rem; }
        .game-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 16px; }
        .category-list .list-item { flex-direction: column; }
        .category-list .list-item .thumb { width: 100%; min-height: 140px; }
        .features-strip .grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
        .footer-grid { grid-template-columns: 1fr; gap: 24px; }
        .cta-section h2 { font-size: 1.5rem; }
        .cta-section .btn-cta { padding: 12px 30px; font-size: 0.95rem; }
    }
    @media (max-width: 520px) {
        .header-top { gap: 8px; }
        .logo { font-size: 1.1rem; }
        .logo .logo-sub { font-size: 0.65rem; padding: 1px 8px; }
        .search-box input { width: 70px; font-size: 0.78rem; }
        .search-box button { width: 30px; height: 30px; font-size: 0.75rem; }
        .btn-header-cta { display: none; }
        .page-banner h1 { font-size: 1.6rem; }
        .game-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
        .game-card .card-body { padding: 12px 14px; }
        .game-card .card-body h3 { font-size: 0.95rem; }
        .game-card .card-body .btn-download { padding: 6px 14px; font-size: 0.75rem; }
        .category-list .list-item .info h3 { font-size: 1rem; }
        .faq-item { padding: 16px 18px; }
    }

    /* Scrollbar */
    ::-webkit-scrollbar { width: 6px; }
    ::-webkit-scrollbar-track { background: var(--bg-dark); }
    ::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 10px; }
    ::-webkit-scrollbar-thumb:hover { background: var(--primary); }

    /* Utilities */
    .mt-4 { margin-top: 24px; }
    .text-center { text-align: center; }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --primary-light: #a5b4fc;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg-dark: #0f172a;
            --bg-darker: #020617;
            --bg-card: #1e293b;
            --bg-body: #f8fafc;
            --text-light: #f1f5f9;
            --text-muted: #94a3b8;
            --text-body: #1e293b;
            --text-weak: #64748b;
            --border-color: #e2e8f0;
            --border-radius: 16px;
            --border-radius-sm: 8px;
            --border-radius-lg: 24px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-lg: 0 20px 60px rgba(0,0,0,0.12);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --max-width: 1200px;
        }

        /* ===== 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-sans);
            font-size: 16px;
            line-height: 1.75;
            color: var(--text-body);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--border-radius-sm); }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
        button { cursor: pointer; font-family: inherit; border: none; background: none; }
        button:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
        input, textarea { font-family: inherit; font-size: 1rem; }
        ul { list-style: none; }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / 双层导航 ===== */
        .site-header {
            background: var(--bg-dark);
            color: var(--text-light);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 20px rgba(0,0,0,0.3);
        }
        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 12px 24px;
            gap: 16px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-light);
            text-decoration: none;
            white-space: nowrap;
            transition: opacity var(--transition);
        }
        .logo:hover { color: var(--text-light); opacity: 0.85; }
        .logo i { color: var(--accent); font-size: 1.6rem; }
        .logo span { background: linear-gradient(135deg, var(--text-light), var(--primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .logo .logo-sub { font-size: 0.7rem; font-weight: 400; background: var(--accent); -webkit-background-clip: unset; -webkit-text-fill-color: #fff; background-clip: unset; background: var(--accent); padding: 2px 10px; border-radius: 20px; margin-left: 4px; }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .search-box {
            display: flex;
            align-items: center;
            background: rgba(255,255,255,0.1);
            border-radius: 40px;
            padding: 0 4px 0 16px;
            border: 1px solid rgba(255,255,255,0.08);
            transition: border-color var(--transition), background var(--transition);
        }
        .search-box:focus-within { border-color: var(--primary-light); background: rgba(255,255,255,0.15); }
        .search-box input {
            background: transparent;
            border: none;
            color: var(--text-light);
            padding: 8px 0;
            min-width: 160px;
            font-size: 0.9rem;
            outline: none;
        }
        .search-box input::placeholder { color: var(--text-muted); }
        .search-box button {
            color: var(--text-muted);
            padding: 8px 14px;
            font-size: 1rem;
            transition: color var(--transition);
        }
        .search-box button:hover { color: var(--accent); }
        .btn-header-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--accent);
            color: #1e293b;
            font-weight: 600;
            font-size: 0.85rem;
            padding: 8px 18px;
            border-radius: 40px;
            transition: background var(--transition), transform var(--transition);
            white-space: nowrap;
        }
        .btn-header-cta:hover { background: var(--accent-dark); color: #1e293b; transform: translateY(-1px); }
        .btn-header-cta i { font-size: 0.9rem; }
        .menu-toggle { display: none; color: var(--text-light); font-size: 1.4rem; padding: 4px 8px; }

        /* 导航第二层 - Tabs */
        .nav-sub {
            background: rgba(15,23,42,0.95);
            border-top: 1px solid rgba(255,255,255,0.06);
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }
        .nav-sub::-webkit-scrollbar { display: none; }
        .nav-sub-inner {
            display: flex;
            gap: 4px;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .nav-sub-inner a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 12px 20px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-muted);
            border-bottom: 2px solid transparent;
            transition: color var(--transition), border-color var(--transition), background var(--transition);
            white-space: nowrap;
        }
        .nav-sub-inner a i { font-size: 0.85rem; }
        .nav-sub-inner a:hover { color: var(--text-light); background: rgba(255,255,255,0.04); }
        .nav-sub-inner a.active,
        .nav-sub-inner a:active { color: var(--accent); border-bottom-color: var(--accent); background: rgba(245,158,11,0.08); }

        /* ===== Hero / Banner (文章页) ===== */
        .article-banner {
            position: relative;
            padding: 100px 0 80px;
            background: linear-gradient(135deg, rgba(15,23,42,0.92), rgba(30,41,59,0.88)), url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            color: var(--text-light);
            text-align: center;
            overflow: hidden;
        }
        .article-banner::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 80px;
            background: linear-gradient(to top, var(--bg-body), transparent);
        }
        .article-banner .container { position: relative; z-index: 2; }
        .article-banner .breadcrumb {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }
        .article-banner .breadcrumb a { color: var(--text-muted); }
        .article-banner .breadcrumb a:hover { color: var(--accent); }
        .article-banner .breadcrumb .sep { color: var(--text-weak); }
        .article-banner .breadcrumb .current { color: var(--text-light); }
        .article-banner .category-badge {
            display: inline-block;
            background: var(--accent);
            color: #1e293b;
            font-weight: 600;
            font-size: 0.8rem;
            padding: 4px 16px;
            border-radius: 40px;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .article-banner h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.3;
            max-width: 800px;
            margin: 0 auto 20px;
            letter-spacing: -0.5px;
        }
        .article-banner .meta {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 20px;
            font-size: 0.9rem;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .article-banner .meta span { display: inline-flex; align-items: center; gap: 6px; }
        .article-banner .meta i { color: var(--accent); font-size: 0.8rem; }

        /* ===== 文章正文 ===== */
        .article-main {
            padding: 60px 0 80px;
        }
        .article-content-wrap {
            max-width: 800px;
            margin: 0 auto;
        }
        .article-featured-image {
            border-radius: var(--border-radius);
            overflow: hidden;
            margin-bottom: 40px;
            box-shadow: var(--shadow-lg);
        }
        .article-featured-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        .article-body {
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--text-body);
        }
        .article-body p {
            margin-bottom: 1.6em;
        }
        .article-body h2, .article-body h3 {
            margin-top: 2em;
            margin-bottom: 0.8em;
            font-weight: 700;
            color: var(--bg-dark);
        }
        .article-body h2 { font-size: 1.6rem; }
        .article-body h3 { font-size: 1.25rem; }
        .article-body ul, .article-body ol {
            margin-bottom: 1.6em;
            padding-left: 1.6em;
        }
        .article-body ul { list-style: disc; }
        .article-body ol { list-style: decimal; }
        .article-body li { margin-bottom: 0.4em; }
        .article-body img { border-radius: var(--border-radius-sm); margin: 1.6em 0; }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: #f1f5f9;
            padding: 1.2em 1.6em;
            margin: 1.6em 0;
            border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
            font-style: italic;
            color: var(--text-weak);
        }
        .article-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
        .article-body a:hover { color: var(--primary-dark); }

        /* 文章标签 & 分享 */
        .article-footer-meta {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 20px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid var(--border-color);
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-tags .tag {
            display: inline-block;
            padding: 4px 14px;
            background: #f1f5f9;
            border-radius: 40px;
            font-size: 0.8rem;
            color: var(--text-weak);
            transition: background var(--transition), color var(--transition);
        }
        .article-tags .tag:hover { background: var(--primary-light); color: var(--bg-dark); }
        .article-share {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .article-share span { font-size: 0.85rem; color: var(--text-weak); }
        .article-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: #f1f5f9;
            color: var(--text-weak);
            font-size: 0.9rem;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .article-share a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }

        /* ===== 相关文章 ===== */
        .related-section {
            background: #f1f5f9;
            padding: 80px 0;
        }
        .related-section .section-title {
            text-align: center;
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--bg-dark);
        }
        .related-section .section-sub {
            text-align: center;
            color: var(--text-weak);
            margin-bottom: 48px;
            font-size: 1.05rem;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .related-card {
            background: #fff;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
        .related-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            display: block;
        }
        .related-card .card-body {
            padding: 20px;
        }
        .related-card .card-cat {
            font-size: 0.75rem;
            color: var(--primary);
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 6px;
        }
        .related-card .card-title {
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.4;
            color: var(--text-body);
            transition: color var(--transition);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card:hover .card-title { color: var(--primary); }
        .related-card .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 12px;
            font-size: 0.8rem;
            color: var(--text-weak);
        }
        .related-card .card-meta i { font-size: 0.7rem; }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--bg-dark), #1a1a3e);
            color: var(--text-light);
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-cta-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 36px;
            background: var(--accent);
            color: #1e293b;
            font-weight: 700;
            font-size: 1rem;
            border-radius: 60px;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
        }
        .btn-cta-primary:hover { background: var(--accent-dark); color: #1e293b; transform: translateY(-2px); box-shadow: 0 8px 30px rgba(245,158,11,0.35); }
        .btn-cta-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 36px;
            background: transparent;
            color: var(--text-light);
            font-weight: 600;
            font-size: 1rem;
            border-radius: 60px;
            border: 2px solid rgba(255,255,255,0.2);
            transition: border-color var(--transition), background var(--transition), transform var(--transition);
        }
        .btn-cta-secondary:hover { border-color: var(--accent); background: rgba(245,158,11,0.1); color: var(--text-light); transform: translateY(-2px); }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 80px 0;
            background: #fff;
        }
        .faq-section .section-title {
            text-align: center;
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--bg-dark);
        }
        .faq-section .section-sub {
            text-align: center;
            color: var(--text-weak);
            margin-bottom: 48px;
            font-size: 1.05rem;
        }
        .faq-grid {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: #f8fafc;
            border-radius: var(--border-radius-sm);
            border: 1px solid var(--border-color);
            padding: 0;
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover { box-shadow: var(--shadow-sm); }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            padding: 20px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-body);
            background: transparent;
            text-align: left;
            transition: background var(--transition);
            gap: 16px;
        }
        .faq-question:hover { background: #f1f5f9; }
        .faq-question i { color: var(--primary); font-size: 0.85rem; transition: transform var(--transition); }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px 20px;
            color: var(--text-weak);
            line-height: 1.7;
            display: none;
        }
        .faq-item.active .faq-answer { display: block; }

        /* ===== 内容未找到 ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 20px;
        }
        .not-found-box i {
            font-size: 4rem;
            color: var(--text-muted);
            margin-bottom: 24px;
        }
        .not-found-box h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--text-weak);
            margin-bottom: 24px;
        }
        .not-found-box .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            border-radius: 60px;
            transition: background var(--transition), transform var(--transition);
        }
        .not-found-box .btn-back:hover { background: var(--primary-dark); color: #fff; transform: translateY(-2px); }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-darker);
            color: var(--text-muted);
            padding: 60px 0 30px;
            border-top: 1px solid rgba(255,255,255,0.05);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo { margin-bottom: 16px; }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; color: var(--text-muted); max-width: 360px; }
        .footer-social { display: flex; gap: 12px; }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.06);
            color: var(--text-muted);
            font-size: 1.1rem;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-3px); }
        .footer-col h4 {
            color: var(--text-light);
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 20px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a {
            color: var(--text-muted);
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: color var(--transition);
        }
        .footer-col ul li a i { font-size: 0.6rem; color: var(--text-weak); transition: color var(--transition); }
        .footer-col ul li a:hover { color: var(--accent); }
        .footer-col ul li a:hover i { color: var(--accent); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-weak);
        }
        .footer-bottom a { color: var(--text-muted); }
        .footer-bottom a:hover { color: var(--accent); }

        /* ===== 移动端响应式 ===== */
        @media (max-width: 1024px) {
            .related-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media (max-width: 768px) {
            .header-top { padding: 10px 16px; }
            .search-box { display: none; }
            .btn-header-cta { font-size: 0.8rem; padding: 6px 14px; }
            .menu-toggle { display: block; }
            .nav-sub-inner { padding: 0 12px; gap: 0; }
            .nav-sub-inner a { padding: 10px 14px; font-size: 0.8rem; }
            .article-banner { padding: 60px 0 50px; }
            .article-banner h1 { font-size: 1.8rem; }
            .article-banner .meta { gap: 12px; font-size: 0.8rem; }
            .article-main { padding: 40px 0 60px; }
            .article-body { font-size: 1rem; }
            .article-footer-meta { flex-direction: column; align-items: flex-start; }
            .related-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
            .related-section { padding: 60px 0; }
            .related-section .section-title { font-size: 1.6rem; }
            .cta-section h2 { font-size: 1.6rem; }
            .cta-section p { font-size: 1rem; }
            .btn-cta-primary, .btn-cta-secondary { padding: 12px 28px; font-size: 0.9rem; }
            .faq-section { padding: 60px 0; }
            .faq-section .section-title { font-size: 1.6rem; }
            .faq-question { padding: 16px 18px; font-size: 0.95rem; }
            .faq-answer { padding: 0 18px 16px; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-brand p { max-width: 100%; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .header-top { padding: 8px 12px; }
            .logo { font-size: 1.2rem; }
            .logo .logo-sub { font-size: 0.6rem; padding: 1px 8px; }
            .btn-header-cta { font-size: 0.75rem; padding: 5px 12px; }
            .btn-header-cta i { display: none; }
            .nav-sub-inner a { padding: 8px 10px; font-size: 0.75rem; }
            .nav-sub-inner a i { display: none; }
            .article-banner h1 { font-size: 1.4rem; }
            .article-banner .meta { flex-direction: column; gap: 6px; }
            .related-grid { grid-template-columns: 1fr; }
            .related-card .card-img { height: 200px; }
            .cta-section { padding: 60px 0; }
            .cta-section h2 { font-size: 1.4rem; }
            .cta-buttons { flex-direction: column; align-items: center; }
            .faq-section .section-title { font-size: 1.4rem; }
        }

        /* ===== 工具类 ===== */
        .mt-4 { margin-top: 1.5rem; }
        .text-center { text-align: center; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }