/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --c-primary: #4F46E5;
            --c-primary-dark: #4338CA;
            --c-primary-light: #818CF8;
            --c-accent: #F59E0B;
            --c-accent-dark: #D97706;
            --c-accent-light: #FCD34D;
            --c-bg: #F8FAFC;
            --c-bg-alt: #F1F5F9;
            --c-bg-dark: #0F172A;
            --c-surface: #FFFFFF;
            --c-text: #1E293B;
            --c-text-secondary: #64748B;
            --c-text-light: #94A3B8;
            --c-border: #E2E8F0;
            --c-border-light: #F1F5F9;
            --c-success: #10B981;
            --c-error: #EF4444;
            --c-info: #3B82F6;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.16);
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 48px;
            --space-3xl: 64px;
            --space-4xl: 80px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --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: 1.6;
            color: var(--c-text);
            background: var(--c-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--c-primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--c-primary-dark); }
        a:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; border-radius: 2px; }
        button { cursor: pointer; font-family: inherit; border: none; background: none; }
        input, textarea, select { font-family: inherit; font-size: 1rem; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; color: var(--c-text); font-weight: 700; }
        h1 { font-size: 2.75rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.375rem; }
        h4 { font-size: 1.125rem; }
        p { margin-bottom: 1rem; color: var(--c-text-secondary); }
        p:last-child { margin-bottom: 0; }

        /* ===== Container ===== */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--space-lg);
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--c-border);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled { box-shadow: var(--shadow-md); }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--c-primary);
            letter-spacing: -0.02em;
        }
        .logo i { font-size: 1.75rem; color: var(--c-accent); }
        .logo span { background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .logo:hover { opacity: 0.9; }
        .nav-main { display: flex; align-items: center; gap: var(--space-xl); }
        .nav-main a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--c-text-secondary);
            padding: var(--space-sm) 0;
            position: relative;
            transition: color var(--transition);
        }
        .nav-main a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--c-primary);
            border-radius: 2px;
            transition: width var(--transition);
        }
        .nav-main a:hover { color: var(--c-text); }
        .nav-main a:hover::after { width: 100%; }
        .nav-main a.active { color: var(--c-primary); }
        .nav-main a.active::after { width: 100%; }
        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            padding: 10px 24px;
            background: var(--c-primary);
            color: #fff !important;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
        }
        .nav-cta i { font-size: 0.9rem; }
        .nav-cta:hover { background: var(--c-primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); color: #fff !important; }
        .nav-cta::after { display: none !important; }
        .nav-toggle { display: none; font-size: 1.5rem; color: var(--c-text); padding: var(--space-sm); }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 85vh;
            display: flex;
            align-items: center;
            background: var(--c-bg-dark);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.4;
            transform: scale(1.05);
            transition: transform 8s ease;
        }
        .hero:hover .hero-bg { transform: scale(1.0); }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.88) 0%, rgba(15,23,42,0.60) 50%, rgba(79,70,229,0.30) 100%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 720px;
            padding: var(--space-4xl) 0;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            background: rgba(79,70,229,0.25);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(129,140,248,0.30);
            padding: 6px 18px;
            border-radius: 100px;
            font-size: 0.85rem;
            color: var(--c-primary-light);
            font-weight: 500;
            margin-bottom: var(--space-lg);
        }
        .hero-badge i { font-size: 0.75rem; color: var(--c-accent); }
        .hero h1 {
            font-size: 3.5rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.15;
            margin-bottom: var(--space-lg);
            letter-spacing: -0.03em;
        }
        .hero h1 span { background: linear-gradient(135deg, var(--c-accent-light), var(--c-accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero p {
            font-size: 1.2rem;
            color: rgba(255,255,255,0.75);
            max-width: 580px;
            margin-bottom: var(--space-xl);
            line-height: 1.7;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-md); }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            padding: 14px 32px;
            background: var(--c-primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
        }
        .btn-primary i { font-size: 0.9rem; }
        .btn-primary:hover { background: var(--c-primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-lg); color: #fff; }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            padding: 14px 32px;
            background: rgba(255,255,255,0.10);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            border: 1px solid rgba(255,255,255,0.20);
            transition: background var(--transition), transform var(--transition), border-color var(--transition);
        }
        .btn-secondary i { font-size: 0.9rem; }
        .btn-secondary:hover { background: rgba(255,255,255,0.18); border-color: rgba(255,255,255,0.35); transform: translateY(-2px); color: #fff; }
        .hero-stats {
            display: flex;
            gap: var(--space-2xl);
            margin-top: var(--space-2xl);
            padding-top: var(--space-xl);
            border-top: 1px solid rgba(255,255,255,0.12);
        }
        .hero-stat-item { text-align: left; }
        .hero-stat-item .num {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.02em;
        }
        .hero-stat-item .num span { color: var(--c-accent); }
        .hero-stat-item .label {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.55);
            margin-top: var(--space-xs);
        }

        /* ===== Section通用 ===== */
        .section { padding: var(--space-4xl) 0; }
        .section-alt { background: var(--c-bg-alt); }
        .section-dark { background: var(--c-bg-dark); }
        .section-header {
            text-align: center;
            max-width: 640px;
            margin: 0 auto var(--space-3xl);
        }
        .section-header h2 { margin-bottom: var(--space-md); }
        .section-header p { font-size: 1.1rem; color: var(--c-text-secondary); }
        .section-header .badge-group {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            background: var(--c-bg-alt);
            padding: 4px 16px 4px 8px;
            border-radius: 100px;
            font-size: 0.85rem;
            color: var(--c-text-secondary);
            margin-bottom: var(--space-md);
            border: 1px solid var(--c-border);
        }
        .section-header .badge-group i { color: var(--c-primary); }
        .badge-dot {
            display: inline-block;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--c-accent);
            margin-right: var(--space-xs);
        }

        /* ===== 介绍板块 ===== */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-3xl);
            align-items: center;
        }
        .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            position: relative;
        }
        .intro-image img { width: 100%; height: 420px; object-fit: cover; transition: transform 0.6s ease; }
        .intro-image:hover img { transform: scale(1.03); }
        .intro-text h2 { margin-bottom: var(--space-md); }
        .intro-text p { font-size: 1.05rem; line-height: 1.8; }
        .intro-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-md);
            margin-top: var(--space-lg);
        }
        .intro-feat {
            display: flex;
            align-items: flex-start;
            gap: var(--space-md);
            padding: var(--space-md);
            background: var(--c-bg);
            border-radius: var(--radius-sm);
            border: 1px solid var(--c-border-light);
        }
        .intro-feat i {
            font-size: 1.25rem;
            color: var(--c-primary);
            margin-top: 2px;
            flex-shrink: 0;
        }
        .intro-feat h4 { font-size: 0.95rem; margin-bottom: 2px; }
        .intro-feat p { font-size: 0.85rem; color: var(--c-text-secondary); margin: 0; }

        /* ===== 分类卡片网格 ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-lg);
        }
        .cat-card {
            background: var(--c-surface);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--c-border);
            transition: transform var(--transition), box-shadow var(--transition);
            cursor: pointer;
        }
        .cat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
        .cat-card-image {
            height: 180px;
            overflow: hidden;
            position: relative;
        }
        .cat-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
        .cat-card:hover .cat-card-image img { transform: scale(1.06); }
        .cat-card-body { padding: var(--space-lg); }
        .cat-card-body h3 { font-size: 1.1rem; margin-bottom: var(--space-xs); }
        .cat-card-body p { font-size: 0.9rem; color: var(--c-text-secondary); margin: 0; }
        .cat-card-tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 100px;
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--c-bg-alt);
            color: var(--c-text-secondary);
            margin-top: var(--space-sm);
        }

        /* ===== 热门推荐 / 内容卡片 ===== */
        .content-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-lg);
        }
        .content-card {
            background: var(--c-surface);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--c-border);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .content-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
        .content-card-image {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .content-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
        .content-card:hover .content-card-image img { transform: scale(1.05); }
        .content-card-image .tag {
            position: absolute;
            top: var(--space-md);
            left: var(--space-md);
            background: rgba(0,0,0,0.65);
            backdrop-filter: blur(8px);
            color: #fff;
            padding: 2px 14px;
            border-radius: 100px;
            font-size: 0.75rem;
            font-weight: 600;
        }
        .content-card-body { padding: var(--space-lg); }
        .content-card-body h3 { font-size: 1.1rem; margin-bottom: var(--space-sm); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .content-card-body p { font-size: 0.9rem; color: var(--c-text-secondary); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: var(--space-md); }
        .content-card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.8rem;
            color: var(--c-text-light);
        }
        .content-card-meta .author { display: flex; align-items: center; gap: var(--space-sm); }
        .content-card-meta .author i { font-size: 0.75rem; }

        /* ===== 最新资讯 / CMS列表 ===== */
        .news-list { display: flex; flex-direction: column; gap: var(--space-md); }
        .news-item {
            display: flex;
            align-items: center;
            gap: var(--space-lg);
            padding: var(--space-lg);
            background: var(--c-surface);
            border-radius: var(--radius-sm);
            border: 1px solid var(--c-border);
            transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
        }
        .news-item:hover { background: var(--c-bg-alt); box-shadow: var(--shadow-sm); transform: translateX(4px); }
        .news-item .num {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--c-border);
            min-width: 36px;
            text-align: center;
            font-feature-settings: "tnum";
        }
        .news-item:nth-child(1) .num { color: var(--c-accent); }
        .news-item:nth-child(2) .num { color: var(--c-primary-light); }
        .news-item:nth-child(3) .num { color: var(--c-info); }
        .news-item-content { flex: 1; min-width: 0; }
        .news-item-content h3 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: var(--space-xs);
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-item-content h3 a { color: var(--c-text); }
        .news-item-content h3 a:hover { color: var(--c-primary); }
        .news-item-content p {
            font-size: 0.88rem;
            color: var(--c-text-secondary);
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin: 0;
        }
        .news-item-meta {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            font-size: 0.8rem;
            color: var(--c-text-light);
            flex-shrink: 0;
        }
        .news-item-meta .cat {
            padding: 2px 12px;
            border-radius: 100px;
            background: var(--c-bg-alt);
            color: var(--c-text-secondary);
            font-weight: 500;
        }
        .news-empty {
            text-align: center;
            padding: var(--space-3xl) var(--space-lg);
            color: var(--c-text-secondary);
            background: var(--c-surface);
            border-radius: var(--radius-md);
            border: 1px dashed var(--c-border);
        }
        .news-empty i { font-size: 2rem; color: var(--c-text-light); margin-bottom: var(--space-md); display: block; }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-lg);
        }
        .stat-card {
            text-align: center;
            padding: var(--space-2xl) var(--space-lg);
            background: var(--c-surface);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--c-border);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
        .stat-card i {
            font-size: 2rem;
            color: var(--c-primary);
            margin-bottom: var(--space-md);
            display: block;
        }
        .stat-card .num {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--c-text);
            letter-spacing: -0.02em;
        }
        .stat-card .num span { color: var(--c-accent); }
        .stat-card .label {
            font-size: 0.9rem;
            color: var(--c-text-secondary);
            margin-top: var(--space-sm);
        }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: var(--space-md); }
        .faq-item {
            background: var(--c-surface);
            border-radius: var(--radius-sm);
            border: 1px solid var(--c-border);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover { box-shadow: var(--shadow-sm); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--space-lg) var(--space-xl);
            font-weight: 600;
            font-size: 1rem;
            color: var(--c-text);
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover { background: var(--c-bg-alt); }
        .faq-question i { color: var(--c-text-light); transition: transform var(--transition); font-size: 0.9rem; }
        .faq-item.active .faq-question i { transform: rotate(180deg); color: var(--c-primary); }
        .faq-answer {
            padding: 0 var(--space-xl) var(--space-lg);
            display: none;
            font-size: 0.95rem;
            color: var(--c-text-secondary);
            line-height: 1.7;
        }
        .faq-item.active .faq-answer { display: block; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--c-primary-dark) 0%, var(--c-primary) 50%, var(--c-primary-light) 100%);
            padding: var(--space-4xl) 0;
            text-align: center;
            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: 0.10;
            mix-blend-mode: overlay;
        }
        .cta-content { position: relative; z-index: 2; max-width: 600px; margin: 0 auto; }
        .cta-content h2 { color: #fff; font-size: 2.25rem; margin-bottom: var(--space-md); }
        .cta-content p { color: rgba(255,255,255,0.80); font-size: 1.1rem; margin-bottom: var(--space-xl); }
        .cta-content .btn-primary {
            background: #fff;
            color: var(--c-primary);
            font-size: 1.05rem;
            padding: 16px 40px;
        }
        .cta-content .btn-primary:hover { background: var(--c-accent-light); color: var(--c-text); box-shadow: 0 8px 32px rgba(0,0,0,0.20); }
        .cta-content .btn-primary i { color: var(--c-primary); }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--c-bg-dark);
            color: rgba(255,255,255,0.70);
            padding: var(--space-3xl) 0 var(--space-xl);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--space-2xl);
            margin-bottom: var(--space-2xl);
        }
        .footer-brand .logo { color: #fff; margin-bottom: var(--space-md); }
        .footer-brand .logo span { -webkit-text-fill-color: #fff; background: none; }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.50); max-width: 320px; }
        .footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: var(--space-md); }
        .footer-col ul { display: flex; flex-direction: column; gap: var(--space-sm); }
        .footer-col a {
            font-size: 0.88rem;
            color: rgba(255,255,255,0.55);
            transition: color var(--transition);
        }
        .footer-col a:hover { color: var(--c-primary-light); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: var(--space-lg);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--space-md);
            font-size: 0.85rem;
            color: rgba(255,255,255,0.40);
        }
        .footer-bottom a { color: rgba(255,255,255,0.50); }
        .footer-bottom a:hover { color: var(--c-primary-light); }
        .footer-social { display: flex; gap: var(--space-md); }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255,255,255,0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255,255,255,0.50);
            transition: background var(--transition), color var(--transition);
        }
        .footer-social a:hover { background: var(--c-primary); color: #fff; }

        /* ===== 返回顶部 ===== */
        .back-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--c-primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: var(--shadow-lg);
            opacity: 0;
            visibility: hidden;
            transform: translateY(20px);
            transition: opacity var(--transition), transform var(--transition), visibility var(--transition), background var(--transition);
            z-index: 50;
        }
        .back-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
        .back-top:hover { background: var(--c-primary-dark); color: #fff; }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .category-grid { grid-template-columns: repeat(2, 1fr); }
            .content-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .intro-grid { grid-template-columns: 1fr; }
            .intro-image img { height: 300px; }
        }
        @media (max-width: 768px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.5rem; }
            .hero { min-height: 70vh; }
            .hero h1 { font-size: 2.25rem; }
            .hero p { font-size: 1rem; }
            .hero-stats { flex-wrap: wrap; gap: var(--space-lg); }
            .hero-stat-item .num { font-size: 1.5rem; }
            .nav-main { display: none; }
            .nav-toggle { display: block; }
            .nav-main.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 72px;
                left: 0;
                right: 0;
                background: var(--c-surface);
                border-bottom: 1px solid var(--c-border);
                padding: var(--space-lg);
                gap: var(--space-md);
                box-shadow: var(--shadow-lg);
            }
            .nav-main.open a { padding: var(--space-sm) 0; }
            .nav-main.open .nav-cta { justify-content: center; }
            .section { padding: var(--space-2xl) 0; }
            .intro-features { grid-template-columns: 1fr; }
            .category-grid { grid-template-columns: 1fr 1fr; }
            .content-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
            .news-item { flex-direction: column; align-items: flex-start; gap: var(--space-sm); }
            .news-item .num { display: none; }
            .news-item-meta { flex-wrap: wrap; }
            .cta-content h2 { font-size: 1.75rem; }
            .container { padding: 0 var(--space-md); }
            .back-top { bottom: 20px; right: 20px; width: 42px; height: 42px; font-size: 1rem; }
        }
        @media (max-width: 520px) {
            .hero h1 { font-size: 1.75rem; }
            .hero-actions { flex-direction: column; }
            .btn-primary, .btn-secondary { justify-content: center; }
            .category-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: 1fr; }
            .intro-image img { height: 220px; }
            .cat-card-image { height: 150px; }
            .content-card-image { height: 170px; }
            .hero-stats { flex-direction: column; gap: var(--space-md); }
        }

        /* ===== 动画 ===== */
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .animate-in { animation: fadeInUp 0.6s ease forwards; }
        .delay-1 { animation-delay: 0.1s; }
        .delay-2 { animation-delay: 0.2s; }
        .delay-3 { animation-delay: 0.3s; }
        .delay-4 { animation-delay: 0.4s; }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --clr-primary: #6c5ce7;
            --clr-primary-dark: #5a4bd1;
            --clr-primary-light: #a29bfe;
            --clr-secondary: #fd79a8;
            --clr-accent: #fdcb6e;
            --clr-dark: #0a0a1a;
            --clr-dark-2: #14142b;
            --clr-dark-3: #1e1e3a;
            --clr-bg: #0f0f23;
            --clr-bg-card: #1a1a35;
            --clr-bg-card-hover: #222244;
            --clr-text: #e8e8f0;
            --clr-text-muted: #9898b8;
            --clr-text-light: #c8c8e0;
            --clr-border: #2a2a4a;
            --clr-border-light: #3a3a5a;
            --clr-white: #ffffff;
            --clr-success: #00cec9;
            --clr-warning: #fdcb6e;
            --clr-danger: #ff6b6b;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.35);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
            --shadow-glow-primary: 0 0 30px rgba(108, 92, 231, 0.25);
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 32px;
            --space-xl: 48px;
            --space-2xl: 72px;
            --space-3xl: 96px;
            --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --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: 1.7;
            background: var(--clr-bg);
            color: var(--clr-text);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        a {
            color: var(--clr-primary-light);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--clr-white);
        }
        a:focus-visible {
            outline: 3px solid var(--clr-primary-light);
            outline-offset: 4px;
            border-radius: 4px;
        }

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

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

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--clr-white);
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--space-lg);
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 var(--space-md);
            }
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 10, 26, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--clr-border);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled {
            background: rgba(10, 10, 26, 0.98);
            box-shadow: var(--shadow-md);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: var(--space-md);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--clr-white);
            letter-spacing: -0.5px;
            flex-shrink: 0;
        }
        .logo i {
            color: var(--clr-primary-light);
            font-size: 1.6rem;
        }
        .logo:hover {
            color: var(--clr-white);
        }
        .logo span {
            background: linear-gradient(135deg, var(--clr-primary-light), var(--clr-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-main {
            display: flex;
            align-items: center;
            gap: var(--space-lg);
        }
        .nav-main a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--clr-text-muted);
            padding: var(--space-sm) var(--space-sm);
            border-radius: var(--radius-sm);
            transition: color var(--transition), background var(--transition);
            position: relative;
        }
        .nav-main a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%) scaleX(0);
            width: 60%;
            height: 3px;
            background: var(--clr-primary-light);
            border-radius: 4px;
            transition: transform var(--transition);
        }
        .nav-main a:hover {
            color: var(--clr-white);
        }
        .nav-main a:hover::after {
            transform: translateX(-50%) scaleX(1);
        }
        .nav-main a.active {
            color: var(--clr-white);
        }
        .nav-main a.active::after {
            transform: translateX(-50%) scaleX(1);
        }

        .nav-cta {
            background: var(--clr-primary);
            color: var(--clr-white) !important;
            padding: 10px 22px !important;
            border-radius: 60px !important;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            box-shadow: 0 4px 16px rgba(108, 92, 231, 0.35);
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition) !important;
        }
        .nav-cta i {
            font-size: 0.9rem;
        }
        .nav-cta:hover {
            background: var(--clr-primary-dark) !important;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(108, 92, 231, 0.45) !important;
        }
        .nav-cta::after {
            display: none !important;
        }

        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--clr-white);
            background: none;
            border: none;
            padding: var(--space-sm);
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--clr-dark-3);
        }

        @media (max-width: 900px) {
            .nav-main {
                position: fixed;
                top: 68px;
                left: 0;
                right: 0;
                background: rgba(10, 10, 26, 0.98);
                backdrop-filter: blur(18px);
                flex-direction: column;
                padding: var(--space-lg) var(--space-md);
                gap: var(--space-md);
                border-bottom: 1px solid var(--clr-border);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: transform 0.35s ease, opacity 0.35s ease;
                align-items: stretch;
                text-align: center;
            }
            .nav-main.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-main a::after {
                display: none;
            }
            .nav-main a {
                padding: 12px 16px;
                border-radius: var(--radius-sm);
                font-size: 1.05rem;
            }
            .nav-main a:hover {
                background: var(--clr-dark-3);
            }
            .nav-main a.active {
                background: var(--clr-dark-3);
                color: var(--clr-primary-light);
            }
            .nav-cta {
                justify-content: center;
                margin-top: var(--space-sm);
            }
            .nav-toggle {
                display: block;
            }
        }

        @media (max-width: 520px) {
            .header-inner {
                height: 60px;
            }
            .logo {
                font-size: 1.15rem;
            }
            .logo i {
                font-size: 1.3rem;
            }
        }

        /* ===== Hero ===== */
        .page-hero {
            padding: 140px 0 72px;
            background: var(--clr-dark-2);
            position: relative;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.2;
            z-index: 0;
        }
        .page-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 10, 26, 0.88) 0%, rgba(20, 20, 43, 0.70) 100%);
            z-index: 1;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-hero h1 {
            font-size: 3rem;
            font-weight: 900;
            letter-spacing: -1px;
            margin-bottom: var(--space-md);
            background: linear-gradient(135deg, var(--clr-white), var(--clr-primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-hero p {
            font-size: 1.15rem;
            color: var(--clr-text-muted);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.8;
        }
        .page-hero .hero-breadcrumb {
            display: flex;
            justify-content: center;
            gap: var(--space-sm);
            font-size: 0.9rem;
            color: var(--clr-text-muted);
            margin-bottom: var(--space-lg);
        }
        .page-hero .hero-breadcrumb a {
            color: var(--clr-text-muted);
        }
        .page-hero .hero-breadcrumb a:hover {
            color: var(--clr-primary-light);
        }
        .page-hero .hero-breadcrumb .sep {
            color: var(--clr-border-light);
        }
        .page-hero .hero-breadcrumb .current {
            color: var(--clr-primary-light);
        }

        @media (max-width: 768px) {
            .page-hero {
                padding: 110px 0 48px;
                min-height: 240px;
            }
            .page-hero h1 {
                font-size: 2rem;
            }
            .page-hero p {
                font-size: 1rem;
            }
        }
        @media (max-width: 520px) {
            .page-hero h1 {
                font-size: 1.6rem;
            }
            .page-hero p {
                font-size: 0.92rem;
            }
        }

        /* ===== Section Shared ===== */
        .section {
            padding: var(--space-2xl) 0;
        }
        .section-alt {
            background: var(--clr-dark-2);
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: var(--space-md);
            letter-spacing: -0.5px;
            text-align: center;
        }
        .section-sub {
            font-size: 1.05rem;
            color: var(--clr-text-muted);
            text-align: center;
            max-width: 600px;
            margin: 0 auto var(--space-xl);
            line-height: 1.7;
        }
        .section-title-left {
            text-align: left;
        }
        .section-sub-left {
            text-align: left;
            margin-left: 0;
        }

        @media (max-width: 768px) {
            .section {
                padding: var(--space-xl) 0;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .section-sub {
                font-size: 0.95rem;
                margin-bottom: var(--space-lg);
            }
        }
        @media (max-width: 520px) {
            .section-title {
                font-size: 1.35rem;
            }
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-lg);
        }
        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .card-grid {
                grid-template-columns: 1fr;
            }
        }

        .card {
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg), var(--shadow-glow-primary);
            border-color: var(--clr-primary);
        }
        .card .card-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            display: block;
            border-radius: 0;
        }
        .card .card-body {
            padding: var(--space-lg);
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-sm);
            margin-bottom: var(--space-sm);
        }
        .card .card-tag {
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 12px;
            border-radius: 60px;
            background: var(--clr-dark-3);
            color: var(--clr-primary-light);
            border: 1px solid var(--clr-border);
            letter-spacing: 0.3px;
            text-transform: uppercase;
        }
        .card .card-tag.hot {
            background: rgba(253, 121, 168, 0.15);
            color: var(--clr-secondary);
            border-color: rgba(253, 121, 168, 0.3);
        }
        .card .card-tag.new {
            background: rgba(0, 206, 201, 0.15);
            color: var(--clr-success);
            border-color: rgba(0, 206, 201, 0.3);
        }
        .card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: var(--space-sm);
            line-height: 1.4;
        }
        .card h3 a {
            color: var(--clr-white);
        }
        .card h3 a:hover {
            color: var(--clr-primary-light);
        }
        .card p {
            font-size: 0.92rem;
            color: var(--clr-text-muted);
            line-height: 1.7;
            flex: 1;
            margin-bottom: var(--space-md);
        }
        .card .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.82rem;
            color: var(--clr-text-muted);
            border-top: 1px solid var(--clr-border);
            padding-top: var(--space-md);
            margin-top: auto;
        }
        .card .card-meta i {
            margin-right: 4px;
            color: var(--clr-primary-light);
        }
        .card .card-meta .meta-left {
            display: flex;
            align-items: center;
            gap: var(--space-md);
        }

        @media (max-width: 520px) {
            .card .card-body {
                padding: var(--space-md);
            }
            .card h3 {
                font-size: 1.05rem;
            }
        }

        /* ===== Featured / Large Card ===== */
        .featured-card {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-xl);
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: box-shadow var(--transition), border-color var(--transition);
        }
        .featured-card:hover {
            box-shadow: var(--shadow-lg), var(--shadow-glow-primary);
            border-color: var(--clr-primary);
        }
        .featured-card .feat-img {
            width: 100%;
            height: 100%;
            min-height: 320px;
            object-fit: cover;
            border-radius: 0;
        }
        .featured-card .feat-body {
            padding: var(--space-xl);
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .featured-card .feat-body .feat-label {
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--clr-secondary);
            text-transform: uppercase;
            letter-spacing: 1.5px;
            margin-bottom: var(--space-sm);
        }
        .featured-card .feat-body h2 {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: var(--space-md);
        }
        .featured-card .feat-body p {
            color: var(--clr-text-muted);
            line-height: 1.8;
            margin-bottom: var(--space-lg);
        }

        @media (max-width: 900px) {
            .featured-card {
                grid-template-columns: 1fr;
            }
            .featured-card .feat-img {
                min-height: 220px;
                max-height: 300px;
            }
            .featured-card .feat-body {
                padding: var(--space-lg);
            }
            .featured-card .feat-body h2 {
                font-size: 1.4rem;
            }
        }
        @media (max-width: 520px) {
            .featured-card .feat-body {
                padding: var(--space-md);
            }
            .featured-card .feat-body h2 {
                font-size: 1.2rem;
            }
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 60px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            border: none;
            cursor: pointer;
            text-decoration: none;
            line-height: 1.2;
        }
        .btn-primary {
            background: var(--clr-primary);
            color: var(--clr-white);
            box-shadow: 0 4px 18px rgba(108, 92, 231, 0.3);
        }
        .btn-primary:hover {
            background: var(--clr-primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(108, 92, 231, 0.45);
            color: var(--clr-white);
        }
        .btn-outline {
            background: transparent;
            color: var(--clr-primary-light);
            border: 2px solid var(--clr-primary);
        }
        .btn-outline:hover {
            background: var(--clr-primary);
            color: var(--clr-white);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(108, 92, 231, 0.3);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.82rem;
        }
        .btn .fa-arrow-right {
            transition: transform var(--transition);
        }
        .btn:hover .fa-arrow-right {
            transform: translateX(4px);
        }

        /* ===== Tags Cloud ===== */
        .tags-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-sm);
            justify-content: center;
            margin-top: var(--space-lg);
        }
        .tags-cloud .tag-item {
            display: inline-block;
            padding: 6px 18px;
            border-radius: 60px;
            font-size: 0.85rem;
            font-weight: 500;
            background: var(--clr-dark-3);
            color: var(--clr-text-muted);
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
        }
        .tags-cloud .tag-item:hover {
            background: var(--clr-primary);
            color: var(--clr-white);
            border-color: var(--clr-primary);
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(108, 92, 231, 0.3);
        }

        /* ===== List / Timeline ===== */
        .guide-list {
            display: grid;
            gap: var(--space-md);
        }
        .guide-item {
            display: flex;
            align-items: flex-start;
            gap: var(--space-lg);
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            transition: all var(--transition);
        }
        .guide-item:hover {
            border-color: var(--clr-primary);
            box-shadow: var(--shadow-sm);
            transform: translateX(4px);
        }
        .guide-item .guide-num {
            font-size: 2rem;
            font-weight: 900;
            color: var(--clr-primary-light);
            opacity: 0.4;
            line-height: 1;
            min-width: 48px;
            font-family: var(--font-mono);
        }
        .guide-item .guide-content {
            flex: 1;
        }
        .guide-item .guide-content h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .guide-item .guide-content h3 a {
            color: var(--clr-white);
        }
        .guide-item .guide-content h3 a:hover {
            color: var(--clr-primary-light);
        }
        .guide-item .guide-content p {
            font-size: 0.9rem;
            color: var(--clr-text-muted);
            line-height: 1.6;
        }
        .guide-item .guide-tag-sm {
            font-size: 0.75rem;
            padding: 2px 12px;
            border-radius: 60px;
            background: var(--clr-dark-3);
            color: var(--clr-primary-light);
            border: 1px solid var(--clr-border);
            flex-shrink: 0;
            align-self: center;
        }

        @media (max-width: 640px) {
            .guide-item {
                flex-direction: column;
                gap: var(--space-sm);
                padding: var(--space-md);
            }
            .guide-item .guide-num {
                font-size: 1.5rem;
                min-width: auto;
            }
            .guide-item .guide-tag-sm {
                align-self: flex-start;
            }
        }

        /* ===== Stats / Data Block ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-lg);
            text-align: center;
        }
        .stat-item {
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-md);
            padding: var(--space-xl) var(--space-lg);
            transition: all var(--transition);
        }
        .stat-item:hover {
            border-color: var(--clr-primary);
            box-shadow: var(--shadow-sm);
            transform: translateY(-4px);
        }
        .stat-item .stat-num {
            font-size: 2.8rem;
            font-weight: 900;
            color: var(--clr-white);
            line-height: 1.1;
            font-family: var(--font-mono);
        }
        .stat-item .stat-num span {
            background: linear-gradient(135deg, var(--clr-primary-light), var(--clr-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .stat-item .stat-label {
            font-size: 0.95rem;
            color: var(--clr-text-muted);
            margin-top: var(--space-sm);
        }

        @media (max-width: 900px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-md);
            }
            .stat-item {
                padding: var(--space-lg) var(--space-md);
            }
            .stat-item .stat-num {
                font-size: 2rem;
            }
        }

        /* ===== FAQ ===== */
        .faq-grid {
            display: grid;
            gap: var(--space-md);
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: var(--clr-primary-light);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--space-lg);
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--clr-white);
            background: none;
            border: none;
            text-align: left;
            cursor: pointer;
            transition: background var(--transition);
            gap: var(--space-md);
        }
        .faq-question:hover {
            background: var(--clr-dark-3);
        }
        .faq-question i {
            color: var(--clr-primary-light);
            transition: transform var(--transition);
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 var(--space-lg) var(--space-lg);
            color: var(--clr-text-muted);
            line-height: 1.8;
            font-size: 0.95rem;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        @media (max-width: 520px) {
            .faq-question {
                padding: var(--space-md);
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 var(--space-md) var(--space-md);
                font-size: 0.9rem;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--clr-dark-2);
            position: relative;
            overflow: hidden;
            text-align: center;
            padding: var(--space-2xl) 0;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: var(--space-md);
        }
        .cta-section p {
            color: var(--clr-text-muted);
            max-width: 540px;
            margin: 0 auto var(--space-lg);
            font-size: 1.05rem;
        }
        .cta-section .btn-group {
            display: flex;
            justify-content: center;
            gap: var(--space-md);
            flex-wrap: wrap;
        }

        @media (max-width: 768px) {
            .cta-section h2 {
                font-size: 1.7rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
        }
        @media (max-width: 520px) {
            .cta-section {
                padding: var(--space-xl) 0;
            }
            .cta-section h2 {
                font-size: 1.4rem;
            }
            .cta-section .btn-group {
                flex-direction: column;
                align-items: center;
            }
        }

        /* ===== Pagination ===== */
        .pagination-wrap {
            display: flex;
            justify-content: center;
            gap: var(--space-sm);
            margin-top: var(--space-xl);
            flex-wrap: wrap;
        }
        .pagination-wrap a,
        .pagination-wrap span {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 44px;
            height: 44px;
            padding: 0 var(--space-md);
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.9rem;
            background: var(--clr-bg-card);
            color: var(--clr-text-muted);
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
        }
        .pagination-wrap a:hover {
            background: var(--clr-primary);
            color: var(--clr-white);
            border-color: var(--clr-primary);
            transform: translateY(-2px);
        }
        .pagination-wrap .current {
            background: var(--clr-primary);
            color: var(--clr-white);
            border-color: var(--clr-primary);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--clr-dark-2);
            border-top: 1px solid var(--clr-border);
            padding: var(--space-2xl) 0 var(--space-lg);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: var(--space-xl);
            margin-bottom: var(--space-xl);
        }
        .footer-brand .logo {
            font-size: 1.3rem;
            margin-bottom: var(--space-md);
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--clr-text-muted);
            line-height: 1.7;
            max-width: 300px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--clr-white);
            margin-bottom: var(--space-md);
        }
        .footer-col ul li {
            margin-bottom: var(--space-sm);
        }
        .footer-col ul li a {
            font-size: 0.88rem;
            color: var(--clr-text-muted);
            transition: color var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .footer-col ul li a:hover {
            color: var(--clr-primary-light);
        }
        .footer-col ul li a i {
            width: 18px;
            color: var(--clr-primary-light);
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: var(--space-lg);
            border-top: 1px solid var(--clr-border);
            font-size: 0.84rem;
            color: var(--clr-text-muted);
            flex-wrap: wrap;
            gap: var(--space-md);
        }
        .footer-social {
            display: flex;
            gap: var(--space-md);
        }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--clr-dark-3);
            color: var(--clr-text-muted);
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
            font-size: 1.1rem;
        }
        .footer-social a:hover {
            background: var(--clr-primary);
            color: var(--clr-white);
            border-color: var(--clr-primary);
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(108, 92, 231, 0.3);
        }

        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-lg);
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--space-lg);
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .site-footer {
                padding: var(--space-xl) 0 var(--space-md);
            }
        }

        /* ===== Back to Top ===== */
        .back-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            z-index: 999;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--clr-primary);
            color: var(--clr-white);
            border: none;
            box-shadow: var(--shadow-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            opacity: 0;
            pointer-events: none;
            transform: translateY(20px);
            transition: all var(--transition);
        }
        .back-top.visible {
            opacity: 1;
            pointer-events: auto;
            transform: translateY(0);
        }
        .back-top:hover {
            background: var(--clr-primary-dark);
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-lg {
            margin-top: var(--space-lg);
        }
        .mt-xl {
            margin-top: var(--space-xl);
        }
        .mb-lg {
            margin-bottom: var(--space-lg);
        }
        .mb-xl {
            margin-bottom: var(--space-xl);
        }

        @media (max-width: 520px) {
            .back-top {
                bottom: 20px;
                right: 20px;
                width: 42px;
                height: 42px;
                font-size: 1rem;
            }
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #6c5ce7;
            --primary-dark: #5a4bd1;
            --primary-light: #a29bfe;
            --secondary: #fd79a8;
            --accent: #00cec9;
            --bg: #0f0e1a;
            --bg-alt: #1a1730;
            --bg-card: #221f3a;
            --bg-elevated: #2d2950;
            --text: #f0edff;
            --text-weak: #9a94b8;
            --text-muted: #6b6590;
            --border: #2d2950;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 6px;
            --shadow: 0 8px 32px rgba(0,0,0,0.35);
            --shadow-hover: 0 14px 40px rgba(108,92,231,0.25);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
        }

        /* ===== 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);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--secondary); }
        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; border: none; outline: none; background: none; color: inherit; }
        button { cursor: pointer; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        h1 { font-size: 2.4rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.5rem; }
        h4 { font-size: 1.2rem; }
        p { margin-bottom: 1rem; color: var(--text-weak); }
        strong { color: var(--text); font-weight: 600; }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(15, 14, 26, 0.88);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(45, 41, 80, 0.5);
            height: var(--header-h);
            transition: background var(--transition);
        }
        .site-header.scrolled { background: rgba(15, 14, 26, 0.96); }
        .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: 1.4rem;
            font-weight: 800;
            color: var(--text) !important;
            letter-spacing: -0.5px;
        }
        .logo i { color: var(--primary-light); font-size: 1.6rem; }
        .logo span { background: linear-gradient(135deg, var(--primary-light), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav-main {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-main a {
            padding: 8px 18px;
            border-radius: var(--radius-xs);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-weak);
            transition: all var(--transition);
            position: relative;
        }
        .nav-main a:hover { color: var(--text); background: rgba(108, 92, 231, 0.12); }
        .nav-main a.active { color: var(--text); background: rgba(108, 92, 231, 0.18); }
        .nav-main a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 2px;
            background: var(--primary-light);
        }
        .nav-main a.nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff !important;
            padding: 10px 26px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            box-shadow: 0 4px 18px rgba(108, 92, 231, 0.35);
            transition: all var(--transition);
            margin-left: 8px;
        }
        .nav-main a.nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(108, 92, 231, 0.45);
        }
        .nav-main a.nav-cta i { margin-right: 6px; }
        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--text);
            padding: 8px 12px;
            border-radius: var(--radius-xs);
            background: rgba(255,255,255,0.06);
        }
        .nav-toggle:hover { background: rgba(255,255,255,0.12); }

        /* ===== Article Banner ===== */
        .article-banner {
            margin-top: var(--header-h);
            padding: 80px 0 60px;
            background: linear-gradient(135deg, rgba(15,14,26,0.92), rgba(26,23,48,0.88)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            border-bottom: 1px solid var(--border);
            position: relative;
        }
        .article-banner::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 80px;
            background: linear-gradient(to top, var(--bg), transparent);
            pointer-events: none;
        }
        .article-banner .container { position: relative; z-index: 1; }
        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .article-breadcrumb a { color: var(--text-muted); }
        .article-breadcrumb a:hover { color: var(--primary-light); }
        .article-breadcrumb span { color: var(--text-weak); }
        .article-breadcrumb i { font-size: 0.7rem; color: var(--text-muted); }
        .article-category-badge {
            display: inline-block;
            background: rgba(108, 92, 231, 0.2);
            color: var(--primary-light);
            padding: 4px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 16px;
            border: 1px solid rgba(108, 92, 231, 0.25);
        }
        .article-banner h1 {
            font-size: 2.6rem;
            max-width: 860px;
            line-height: 1.3;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #fff, var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 24px;
            flex-wrap: wrap;
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .article-meta i { margin-right: 6px; color: var(--primary-light); }
        .article-meta span { display: flex; align-items: center; }

        /* ===== Article Main ===== */
        .article-main {
            padding: 60px 0 80px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 48px;
        }
        .article-body {
            background: var(--bg-alt);
            border-radius: var(--radius);
            padding: 48px;
            border: 1px solid var(--border);
        }
        .article-body h2 { font-size: 1.7rem; margin: 2rem 0 1rem; color: var(--text); }
        .article-body h3 { font-size: 1.3rem; margin: 1.6rem 0 0.8rem; color: var(--text); }
        .article-body p { margin-bottom: 1.2rem; color: var(--text-weak); line-height: 1.8; }
        .article-body ul, .article-body ol { margin: 1rem 0 1.2rem 1.6rem; color: var(--text-weak); }
        .article-body li { margin-bottom: 0.5rem; list-style: disc; }
        .article-body a { color: var(--primary-light); text-decoration: underline; text-underline-offset: 3px; }
        .article-body a:hover { color: var(--secondary); }
        .article-body img { border-radius: var(--radius-sm); margin: 1.5rem 0; box-shadow: var(--shadow); }
        .article-body blockquote {
            border-left: 4px solid var(--primary-light);
            padding: 16px 24px;
            margin: 1.5rem 0;
            background: rgba(108, 92, 231, 0.08);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-weak);
            font-style: italic;
        }
        .article-body code {
            background: rgba(255,255,255,0.06);
            padding: 2px 10px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--secondary);
        }
        .article-body pre {
            background: var(--bg-card);
            padding: 24px;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            margin: 1.5rem 0;
            border: 1px solid var(--border);
        }
        .article-body pre code { background: none; padding: 0; color: var(--text-weak); }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-alt);
            border-radius: var(--radius);
            padding: 28px 24px;
            border: 1px solid var(--border);
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 1px solid var(--border);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card h3 i { color: var(--primary-light); }
        .sidebar-list li {
            padding: 10px 0;
            border-bottom: 1px solid rgba(45,41,80,0.4);
        }
        .sidebar-list li:last-child { border-bottom: none; }
        .sidebar-list a {
            color: var(--text-weak);
            font-size: 0.95rem;
            display: block;
            transition: color var(--transition);
        }
        .sidebar-list a:hover { color: var(--primary-light); }
        .sidebar-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .sidebar-tags a {
            padding: 4px 14px;
            border-radius: 50px;
            background: rgba(108,92,231,0.1);
            border: 1px solid rgba(108,92,231,0.15);
            color: var(--text-weak);
            font-size: 0.85rem;
            transition: all var(--transition);
        }
        .sidebar-tags a:hover {
            background: rgba(108,92,231,0.2);
            color: var(--primary-light);
            border-color: var(--primary-light);
        }
        .sidebar-cta {
            display: block;
            text-align: center;
            padding: 14px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff !important;
            font-weight: 600;
            transition: all var(--transition);
        }
        .sidebar-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(108,92,231,0.35); }

        /* ===== Article Footer (Tags / Share) ===== */
        .article-footer-extra {
            margin-top: 40px;
            padding-top: 28px;
            border-top: 1px solid var(--border);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-tags span {
            padding: 4px 14px;
            border-radius: 50px;
            background: rgba(108,92,231,0.1);
            border: 1px solid rgba(108,92,231,0.15);
            color: var(--text-weak);
            font-size: 0.85rem;
        }
        .article-share {
            display: flex;
            align-items: center;
            gap: 12px;
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .article-share a {
            width: 38px;
            height: 38px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(255,255,255,0.06);
            color: var(--text-weak);
            transition: all var(--transition);
            font-size: 1.1rem;
        }
        .article-share a:hover { background: rgba(108,92,231,0.2); color: var(--primary-light); transform: translateY(-2px); }

        /* ===== Related Posts ===== */
        .related-section {
            padding: 60px 0;
            background: var(--bg-alt);
            border-top: 1px solid var(--border);
        }
        .related-section h2 {
            text-align: center;
            margin-bottom: 40px;
            font-size: 1.8rem;
        }
        .related-section h2 i { color: var(--primary-light); margin-right: 10px; }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: rgba(108,92,231,0.3); }
        .related-card img { width: 100%; height: 180px; object-fit: cover; border-radius: 0; }
        .related-card-body { padding: 20px 22px 24px; }
        .related-card-body h3 { font-size: 1.05rem; margin-bottom: 8px; }
        .related-card-body h3 a { color: var(--text); }
        .related-card-body h3 a:hover { color: var(--primary-light); }
        .related-card-body p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 12px; }
        .related-card-body .meta { font-size: 0.8rem; color: var(--text-muted); display: flex; align-items: center; gap: 12px; }
        .related-card-body .meta i { margin-right: 4px; }

        /* ===== CTA Section ===== */
        .article-cta {
            padding: 60px 0;
            text-align: center;
            background: linear-gradient(135deg, rgba(108,92,231,0.08), rgba(253,121,168,0.06));
        }
        .article-cta h2 { font-size: 1.8rem; margin-bottom: 12px; }
        .article-cta p { color: var(--text-muted); max-width: 540px; margin: 0 auto 28px; }
        .article-cta .btn-group { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
        .btn-primary, .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff !important;
            box-shadow: 0 4px 18px rgba(108,92,231,0.3);
        }
        .btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 32px rgba(108,92,231,0.4); }
        .btn-outline {
            border: 2px solid var(--border);
            color: var(--text-weak) !important;
        }
        .btn-outline:hover { border-color: var(--primary-light); color: var(--primary-light) !important; background: rgba(108,92,231,0.08); }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-alt);
            border-top: 1px solid var(--border);
            padding: 60px 0 0;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
        }
        .footer-brand .logo { font-size: 1.3rem; margin-bottom: 16px; display: inline-flex; }
        .footer-brand p { color: var(--text-muted); font-size: 0.9rem; max-width: 320px; }
        .footer-col h4 { font-size: 1rem; margin-bottom: 16px; color: var(--text); }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: var(--text-muted); font-size: 0.9rem; transition: color var(--transition); }
        .footer-col ul li a:hover { color: var(--primary-light); padding-left: 4px; }
        .footer-col ul li a i { margin-right: 6px; width: 18px; text-align: center; }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            padding: 24px 0;
            border-top: 1px solid var(--border);
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .footer-social { display: flex; gap: 12px; }
        .footer-social a {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(255,255,255,0.05);
            color: var(--text-muted);
            transition: all var(--transition);
            font-size: 1rem;
        }
        .footer-social a:hover { background: rgba(108,92,231,0.2); color: var(--primary-light); transform: translateY(-2px); }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 20px;
        }
        .not-found-box i { font-size: 4rem; color: var(--text-muted); margin-bottom: 24px; display: block; }
        .not-found-box h2 { font-size: 1.8rem; margin-bottom: 12px; }
        .not-found-box p { color: var(--text-muted); margin-bottom: 28px; }
        .not-found-box .btn-primary { display: inline-flex; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
            .related-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            h1 { font-size: 1.8rem; }
            h2 { font-size: 1.5rem; }
            .nav-main {
                position: fixed;
                top: var(--header-h);
                left: 0;
                width: 100%;
                background: rgba(15,14,26,0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px;
                gap: 6px;
                border-bottom: 1px solid var(--border);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
                pointer-events: none;
            }
            .nav-main.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav-main a { width: 100%; padding: 12px 18px; border-radius: var(--radius-xs); }
            .nav-main a.nav-cta { margin-left: 0; text-align: center; }
            .nav-toggle { display: block; }
            .article-banner { padding: 60px 0 40px; }
            .article-banner h1 { font-size: 1.8rem; }
            .article-body { padding: 28px 20px; }
            .article-sidebar { grid-template-columns: 1fr; }
            .related-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .article-footer-extra { flex-direction: column; align-items: flex-start; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .article-banner h1 { font-size: 1.5rem; }
            .article-body { padding: 20px 16px; }
            .article-meta { gap: 12px; font-size: 0.8rem; }
            .btn-primary, .btn-outline { width: 100%; justify-content: center; }
        }