/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f1b2d;
            --primary-light: #1a2d4a;
            --primary-dark: #070e1a;
            --accent: #f0b90b;
            --accent-light: #fcd34d;
            --accent-dark: #c9940a;
            --bg: #ffffff;
            --bg-alt: #f4f6fa;
            --bg-dark: #0a1422;
            --text: #1a1a2e;
            --text-light: #4a5568;
            --text-muted: #8896a8;
            --border: #e2e8f0;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 20px rgba(0,0,0,0.06);
            --shadow-lg: 0 12px 48px rgba(0,0,0,0.10);
            --shadow-accent: 0 4px 20px rgba(240,185,11,0.25);
            --space: 24px;
            --space-lg: 48px;
            --space-xl: 80px;
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --max-width: 1200px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--accent-dark); }
        a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea, select { font-family: inherit; font-size: inherit; }
        button { cursor: pointer; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--primary); }
        h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
        h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); margin-bottom: var(--space); }
        h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); }
        h4 { font-size: 1.1rem; }
        p { margin-bottom: 1rem; color: var(--text-light); }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* ===== 导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(15, 27, 45, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            box-shadow: 0 2px 20px rgba(0,0,0,0.2);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo i { color: var(--accent); font-size: 1.3rem; }
        .logo:hover { color: var(--accent); }
        .nav-tabs {
            display: flex;
            align-items: center;
            gap: 4px;
            background: rgba(255,255,255,0.06);
            padding: 4px;
            border-radius: 40px;
        }
        .nav-tabs a {
            padding: 8px 20px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 500;
            color: rgba(255,255,255,0.7);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-tabs a:hover { color: #fff; background: rgba(255,255,255,0.08); }
        .nav-tabs a.active {
            background: var(--accent);
            color: var(--primary-dark);
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(240,185,11,0.3);
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .nav-cta .search-toggle {
            color: rgba(255,255,255,0.7);
            font-size: 1.1rem;
            padding: 8px;
            border-radius: 50%;
            transition: all var(--transition);
        }
        .nav-cta .search-toggle:hover { color: #fff; background: rgba(255,255,255,0.08); }
        .nav-cta .btn-primary {
            background: var(--accent);
            color: var(--primary-dark);
            padding: 8px 20px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.85rem;
            transition: all var(--transition);
        }
        .nav-cta .btn-primary:hover {
            background: var(--accent-light);
            transform: translateY(-1px);
            box-shadow: var(--shadow-accent);
        }
        .mobile-toggle { display: none; color: #fff; font-size: 1.4rem; padding: 8px; }

        /* ===== 移动端导航 ===== */
        @media (max-width: 768px) {
            .nav-tabs { display: none; }
            .nav-cta .btn-primary { display: none; }
            .mobile-toggle { display: block; }
            .header-inner { height: 56px; }
            .mobile-menu-open .nav-tabs {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 56px;
                left: 0;
                right: 0;
                background: var(--primary);
                padding: 16px;
                border-radius: 0 0 var(--radius) var(--radius);
                box-shadow: var(--shadow-lg);
                gap: 8px;
                border: 1px solid rgba(255,255,255,0.06);
            }
            .mobile-menu-open .nav-tabs a { width: 100%; text-align: center; padding: 12px; }
            .mobile-menu-open .nav-cta .btn-primary { display: block; width: 100%; text-align: center; margin-top: 8px; }
        }

        /* ===== Hero ===== */
        .hero {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, #0d2137 100%);
            color: #fff;
            padding: var(--space-xl) 0;
            position: relative;
            overflow: hidden;
            min-height: 520px;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 70% 20%, rgba(240,185,11,0.08) 0%, transparent 60%),
                        radial-gradient(ellipse at 20% 80%, rgba(255,255,255,0.03) 0%, transparent 50%);
            pointer-events: none;
        }
        .hero .container { position: relative; z-index: 1; width: 100%; }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(240,185,11,0.15);
            border: 1px solid rgba(240,185,11,0.2);
            padding: 6px 16px;
            border-radius: 40px;
            font-size: 0.8rem;
            color: var(--accent);
            font-weight: 500;
            margin-bottom: 20px;
        }
        .hero h1 { color: #fff; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 16px; }
        .hero h1 span { color: var(--accent); }
        .hero p {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.75);
            max-width: 600px;
            margin-bottom: 28px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .hero-actions .btn-primary {
            background: var(--accent);
            color: var(--primary-dark);
            padding: 14px 32px;
            border-radius: 40px;
            font-weight: 700;
            font-size: 1rem;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .hero-actions .btn-primary:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: var(--shadow-accent);
        }
        .hero-actions .btn-outline {
            border: 1px solid rgba(255,255,255,0.25);
            color: #fff;
            padding: 14px 32px;
            border-radius: 40px;
            font-weight: 600;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .hero-actions .btn-outline:hover {
            background: rgba(255,255,255,0.08);
            border-color: rgba(255,255,255,0.4);
            transform: translateY(-2px);
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 40px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.08);
        }
        .hero-stats .stat-num { font-size: 1.8rem; font-weight: 800; color: #fff; }
        .hero-stats .stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.55); }

        @media (max-width: 640px) {
            .hero { min-height: auto; padding: 60px 0 48px; }
            .hero-stats { gap: 24px; flex-wrap: wrap; }
            .hero-stats .stat-num { font-size: 1.4rem; }
            .hero-actions .btn-primary, .hero-actions .btn-outline { width: 100%; justify-content: center; }
        }

        /* ===== 通用板块 ===== */
        .section { padding: var(--space-xl) 0; }
        .section-alt { background: var(--bg-alt); }
        .section-dark { background: var(--bg-dark); color: #fff; }
        .section-dark h2, .section-dark h3 { color: #fff; }
        .section-dark p { color: rgba(255,255,255,0.7); }
        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto var(--space-lg);
        }
        .section-header .subtitle {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--accent);
            font-weight: 600;
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 8px;
        }
        .section-header h2 { margin-bottom: 12px; }
        .section-header p { font-size: 1.05rem; }

        /* ===== 卡片网格 ===== */
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space); }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space); }
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space); }
        @media (max-width: 1024px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
        @media (max-width: 768px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
        @media (max-width: 520px) { .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; } }

        /* ===== 卡片 ===== */
        .card {
            background: var(--bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            padding: 24px;
            transition: all var(--transition);
        }
        .card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
        .card-alt { background: var(--bg-alt); border-color: transparent; }
        .card-dark { background: rgba(255,255,255,0.04); border-color: rgba(255,255,255,0.06); }
        .card-dark:hover { background: rgba(255,255,255,0.07); }
        .card-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(240,185,11,0.1);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-bottom: 16px;
        }
        .card h3 { margin-bottom: 8px; }
        .card p { font-size: 0.95rem; color: var(--text-light); margin-bottom: 0; }
        .card .tag {
            display: inline-block;
            background: var(--bg-alt);
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 500;
            color: var(--text-muted);
            margin-top: 12px;
        }

        /* ===== 特色卡片（竖向封面风格） ===== */
        .feature-card {
            background: var(--bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
        .feature-card .card-img {
            aspect-ratio: 16 / 10;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 2rem;
            position: relative;
        }
        .feature-card .card-img .overlay {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--accent);
            color: var(--primary-dark);
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 0.7rem;
            font-weight: 700;
        }
        .feature-card .card-body { padding: 20px; }
        .feature-card .card-body h3 { font-size: 1.05rem; margin-bottom: 6px; }
        .feature-card .card-body p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 8px; }
        .feature-card .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .feature-card .card-meta .hot {
            background: #fee2e2;
            color: #dc2626;
            padding: 0 10px;
            border-radius: 12px;
            font-size: 0.7rem;
            font-weight: 600;
        }

        /* ===== 资讯列表（CMS） ===== */
        .cms-list { display: flex; flex-direction: column; gap: 16px; }
        .cms-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            background: var(--bg);
            padding: 16px 20px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .cms-item:hover { border-color: var(--accent); box-shadow: var(--shadow); }
        .cms-item .num {
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--accent);
            min-width: 32px;
            opacity: 0.6;
        }
        .cms-item .info { flex: 1; }
        .cms-item .info h4 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
        .cms-item .info h4 a { color: var(--text); }
        .cms-item .info h4 a:hover { color: var(--accent-dark); }
        .cms-item .info .meta { font-size: 0.8rem; color: var(--text-muted); display: flex; gap: 12px; flex-wrap: wrap; }
        .cms-item .info .meta .cat { color: var(--accent); font-weight: 500; }
        .cms-empty {
            text-align: center;
            padding: 48px 20px;
            color: var(--text-muted);
            background: var(--bg-alt);
            border-radius: var(--radius);
            font-size: 1rem;
        }

        /* ===== 步骤/流程 ===== */
        .steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space); counter-reset: step; }
        .step-item { text-align: center; padding: 32px 20px; position: relative; }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            display: block;
            width: 48px;
            height: 48px;
            line-height: 48px;
            border-radius: 50%;
            background: var(--accent);
            color: var(--primary-dark);
            font-size: 1.3rem;
            font-weight: 800;
            margin: 0 auto 16px;
        }
        .step-item h3 { margin-bottom: 8px; }
        .step-item p { font-size: 0.9rem; }
        @media (max-width: 768px) { .steps { grid-template-columns: 1fr; gap: 16px; } }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--accent); }
        .faq-question {
            padding: 16px 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            cursor: pointer;
            color: var(--text);
            background: none;
            width: 100%;
            text-align: left;
            font-size: 1rem;
        }
        .faq-question i { transition: transform var(--transition); color: var(--accent); }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
            padding: 0 20px;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 20px 16px;
        }
        .faq-answer p { font-size: 0.95rem; color: var(--text-light); margin-bottom: 0; }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, var(--primary) 0%, #0d2137 100%);
            border-radius: var(--radius-lg);
            padding: 60px 40px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(240,185,11,0.06) 0%, transparent 60%);
        }
        .cta-block h2 { color: #fff; margin-bottom: 12px; position: relative; }
        .cta-block p { color: rgba(255,255,255,0.7); max-width: 560px; margin: 0 auto 24px; position: relative; }
        .cta-block .btn-primary {
            background: var(--accent);
            color: var(--primary-dark);
            padding: 14px 40px;
            border-radius: 40px;
            font-weight: 700;
            font-size: 1rem;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            position: relative;
        }
        .cta-block .btn-primary:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: var(--shadow-accent); }

        /* ===== 排行列表 ===== */
        .rank-list { display: flex; flex-direction: column; gap: 8px; }
        .rank-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            background: var(--bg);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .rank-item:hover { border-color: var(--accent); background: rgba(240,185,11,0.02); }
        .rank-item .rank-num {
            font-weight: 800;
            font-size: 1.1rem;
            min-width: 28px;
            color: var(--text-muted);
        }
        .rank-item:nth-child(1) .rank-num { color: var(--accent); }
        .rank-item:nth-child(2) .rank-num { color: var(--accent); }
        .rank-item:nth-child(3) .rank-num { color: var(--accent); }
        .rank-item .rank-info { flex: 1; }
        .rank-item .rank-info h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 2px; }
        .rank-item .rank-info .meta { font-size: 0.78rem; color: var(--text-muted); }
        .rank-item .rank-score { font-weight: 700; color: var(--accent); font-size: 0.9rem; }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.6);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-grid h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
        .footer-grid p { font-size: 0.9rem; color: rgba(255,255,255,0.5); }
        .footer-grid ul li { margin-bottom: 8px; }
        .footer-grid ul li a { color: rgba(255,255,255,0.5); font-size: 0.9rem; }
        .footer-grid ul li a:hover { color: var(--accent); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
        }
        .footer-bottom .copyright { color: rgba(255,255,255,0.4); }
        .footer-bottom .legal { display: flex; gap: 16px; }
        .footer-bottom .legal a { color: rgba(255,255,255,0.4); font-size: 0.85rem; }
        .footer-bottom .legal a:hover { color: var(--accent); }
        @media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; } }
        @media (max-width: 520px) { .footer-grid { grid-template-columns: 1fr; } }

        /* ===== 工具类 ===== */
        .text-center { text-align: center; }
        .mt-24 { margin-top: 24px; }
        .mb-24 { margin-bottom: 24px; }
        .gap-12 { gap: 12px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }

        /* ===== 按钮通用 ===== */
        .btn-outline-accent {
            border: 1px solid var(--accent);
            color: var(--accent);
            padding: 10px 24px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn-outline-accent:hover { background: var(--accent); color: var(--primary-dark); transform: translateY(-2px); }

        /* ===== 热门标签 ===== */
        .hot-tags { display: flex; flex-wrap: wrap; gap: 8px; }
        .hot-tags a {
            padding: 6px 16px;
            border-radius: 30px;
            background: var(--bg-alt);
            color: var(--text-light);
            font-size: 0.85rem;
            font-weight: 500;
            transition: all var(--transition);
            border: 1px solid transparent;
        }
        .hot-tags a:hover { background: var(--accent); color: var(--primary-dark); border-color: var(--accent); transform: translateY(-1px); }
        .hot-tags a.tag-accent { background: rgba(240,185,11,0.1); color: var(--accent); border-color: rgba(240,185,11,0.2); }

        /* ===== 分隔线 ===== */
        .divider { height: 1px; background: var(--border); margin: var(--space-lg) 0; }

        /* ===== 搜索框 ===== */
        .search-bar {
            display: flex;
            max-width: 480px;
            margin: 0 auto;
            background: var(--bg);
            border-radius: 40px;
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .search-bar:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(240,185,11,0.1); }
        .search-bar input {
            flex: 1;
            padding: 12px 20px;
            border: none;
            outline: none;
            background: transparent;
            font-size: 0.95rem;
        }
        .search-bar button {
            padding: 12px 20px;
            background: var(--accent);
            color: var(--primary-dark);
            font-weight: 600;
            transition: all var(--transition);
        }
        .search-bar button:hover { background: var(--accent-light); }

        /* ===== 瀑布流网格（热点感） ===== */
        .masonry-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space);
        }
        .masonry-grid .wide { grid-column: span 2; }
        @media (max-width: 768px) { .masonry-grid { grid-template-columns: 1fr; } .masonry-grid .wide { grid-column: span 1; } }

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

        /* ===== 星空装饰 ===== */
        .star-field { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
        .star { position: absolute; width: 2px; height: 2px; background: #fff; border-radius: 50%; animation: twinkle 3s infinite alternate; }
        @keyframes twinkle { 0% { opacity: 0.2; } 100% { opacity: 0.9; } }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a1a2e;
            --primary-light: #16213e;
            --primary-dark: #0f0f1a;
            --accent: #e94560;
            --accent-light: #ff6b81;
            --accent-dark: #c2334a;
            --secondary: #0f3460;
            --secondary-light: #1a5276;
            --bg-dark: #0a0a16;
            --bg-card: #12122a;
            --bg-card-hover: #1a1a3a;
            --text-primary: #f0f0f5;
            --text-secondary: #b0b0c8;
            --text-weak: #6a6a8a;
            --border-color: rgba(233, 69, 96, 0.15);
            --border-light: rgba(255, 255, 255, 0.06);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
            --shadow-hover: 0 16px 48px rgba(233, 69, 96, 0.15);
            --transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --container-max: 1200px;
            --header-height: 70px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-dark);
            min-height: 100vh;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-light);
        }
        a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 4px;
            border-radius: 4px;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: 1rem;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        button:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 4px;
        }
        ul,
        ol {
            list-style: none;
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(10, 10, 22, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: var(--header-height);
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            gap: 24px;
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .logo i {
            color: var(--accent);
            font-size: 1.3rem;
        }
        .logo:hover {
            color: var(--text-primary);
        }
        .nav-tabs {
            display: flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.04);
            padding: 4px;
            border-radius: 40px;
            border: 1px solid var(--border-light);
            flex-wrap: wrap;
        }
        .nav-tabs a {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 20px;
            border-radius: 32px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-tabs a i {
            font-size: 0.85rem;
        }
        .nav-tabs a:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-tabs a.active {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 16px rgba(233, 69, 96, 0.35);
        }
        .nav-tabs a.active:hover {
            background: var(--accent-light);
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .nav-cta .search-btn {
            color: var(--text-secondary);
            font-size: 1.1rem;
            padding: 8px 12px;
            border-radius: 30px;
            transition: var(--transition);
        }
        .nav-cta .search-btn:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-cta .btn-primary {
            background: var(--accent);
            color: #fff;
            padding: 8px 22px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.85rem;
            transition: var(--transition);
            box-shadow: 0 4px 16px rgba(233, 69, 96, 0.25);
        }
        .nav-cta .btn-primary:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(233, 69, 96, 0.35);
        }
        .mobile-toggle {
            display: none;
            color: var(--text-primary);
            font-size: 1.4rem;
            padding: 8px;
            border-radius: 8px;
            background: rgba(255, 255, 255, 0.04);
        }
        .mobile-toggle:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        @media (max-width: 820px) {
            .nav-tabs {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(10, 10, 22, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px;
                border-radius: 0 0 20px 20px;
                border: 1px solid var(--border-light);
                border-top: none;
                gap: 8px;
                box-shadow: 0 24px 48px rgba(0, 0, 0, 0.6);
            }
            .nav-tabs.open {
                display: flex;
            }
            .nav-tabs a {
                width: 100%;
                justify-content: flex-start;
                padding: 12px 20px;
                border-radius: 12px;
            }
            .mobile-toggle {
                display: block;
            }
            .nav-cta .btn-primary {
                display: none;
            }
            .nav-cta .search-btn {
                font-size: 1.2rem;
            }
        }
        @media (max-width: 480px) {
            .logo {
                font-size: 1.2rem;
            }
            .logo i {
                font-size: 1rem;
            }
        }

        /* ===== Hero ===== */
        .category-hero {
            padding: 80px 0 60px;
            background: linear-gradient(160deg, var(--bg-dark) 0%, var(--primary) 60%, var(--secondary) 100%);
            position: relative;
            overflow: hidden;
            text-align: center;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 40%, rgba(233, 69, 96, 0.12) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 60%, rgba(15, 52, 96, 0.2) 0%, transparent 50%);
            pointer-events: none;
        }
        .category-hero .container {
            position: relative;
            z-index: 1;
        }
        .category-hero h1 {
            font-size: 3rem;
            font-weight: 800;
            letter-spacing: -1px;
            line-height: 1.2;
            margin-bottom: 16px;
            background: linear-gradient(135deg, #f0f0f5 0%, var(--accent-light) 80%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .category-hero p {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .category-hero .hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
        }
        .category-hero .hero-badges span {
            background: rgba(233, 69, 96, 0.12);
            border: 1px solid rgba(233, 69, 96, 0.2);
            color: var(--accent-light);
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .category-hero .hero-badges span i {
            font-size: 0.75rem;
        }

        @media (max-width: 768px) {
            .category-hero {
                padding: 56px 0 44px;
            }
            .category-hero h1 {
                font-size: 2rem;
            }
            .category-hero p {
                font-size: 1rem;
            }
        }
        @media (max-width: 480px) {
            .category-hero h1 {
                font-size: 1.6rem;
            }
            .category-hero .hero-badges span {
                font-size: 0.75rem;
                padding: 4px 14px;
            }
        }

        /* ===== Section Common ===== */
        .section {
            padding: 72px 0;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .section-sub {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin-bottom: 48px;
            line-height: 1.6;
        }
        .section-title-center {
            text-align: center;
        }
        .section-sub-center {
            text-align: center;
            margin-left: auto;
            margin-right: auto;
        }
        .section-divider {
            width: 50px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin: 0 auto 16px;
        }

        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .section-sub {
                font-size: 0.95rem;
                margin-bottom: 32px;
            }
        }

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

        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .card-grid.cols-4 {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .card-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .card-grid.cols-2,
            .card-grid.cols-4 {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Card ===== */
        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 28px 24px 24px;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(233, 69, 96, 0.2);
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .card .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            background: rgba(233, 69, 96, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--accent);
            margin-bottom: 16px;
        }
        .card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .card p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
        }
        .card .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 16px;
            padding-top: 14px;
            border-top: 1px solid var(--border-light);
            font-size: 0.8rem;
            color: var(--text-weak);
        }
        .card .card-meta i {
            margin-right: 4px;
        }
        .card .card-tag {
            display: inline-block;
            background: rgba(233, 69, 96, 0.1);
            color: var(--accent-light);
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            text-transform: uppercase;
        }

        /* ===== Article Card (horizontal) ===== */
        .article-card {
            display: flex;
            gap: 24px;
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 20px;
            transition: var(--transition);
            align-items: flex-start;
        }
        .article-card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(233, 69, 96, 0.15);
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .article-card .art-thumb {
            width: 180px;
            min-height: 120px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--secondary), var(--primary-light));
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.2rem;
            color: rgba(233, 69, 96, 0.25);
        }
        .article-card .art-body {
            flex: 1;
        }
        .article-card .art-body h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text-primary);
        }
        .article-card .art-body p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 10px;
        }
        .article-card .art-body .art-footer {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.78rem;
            color: var(--text-weak);
        }
        .article-card .art-body .art-footer i {
            margin-right: 4px;
        }

        @media (max-width: 640px) {
            .article-card {
                flex-direction: column;
                padding: 16px;
                gap: 14px;
            }
            .article-card .art-thumb {
                width: 100%;
                height: 140px;
            }
        }

        /* ===== Featured / Large Card ===== */
        .featured-card {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            overflow: hidden;
            display: grid;
            grid-template-columns: 1fr 1fr;
            transition: var(--transition);
        }
        .featured-card:hover {
            border-color: rgba(233, 69, 96, 0.2);
            box-shadow: var(--shadow-hover);
            transform: translateY(-6px);
        }
        .featured-card .feat-img {
            min-height: 300px;
            background: linear-gradient(145deg, var(--secondary), var(--primary-dark));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 4rem;
            color: rgba(233, 69, 96, 0.15);
        }
        .featured-card .feat-body {
            padding: 36px 32px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .featured-card .feat-body .badge {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 12px;
            width: fit-content;
        }
        .featured-card .feat-body h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
            line-height: 1.3;
        }
        .featured-card .feat-body p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 20px;
        }
        .featured-card .feat-body .btn-outline {
            align-self: flex-start;
        }

        @media (max-width: 768px) {
            .featured-card {
                grid-template-columns: 1fr;
            }
            .featured-card .feat-img {
                min-height: 200px;
            }
            .featured-card .feat-body {
                padding: 24px 20px;
            }
            .featured-card .feat-body h3 {
                font-size: 1.25rem;
            }
        }

        /* ===== Buttons ===== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #fff;
            padding: 12px 28px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
            border: none;
            box-shadow: 0 4px 16px rgba(233, 69, 96, 0.25);
        }
        .btn-primary:hover {
            background: var(--accent-light);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(233, 69, 96, 0.35);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--text-primary);
            padding: 10px 24px;
            border-radius: 30px;
            font-weight: 500;
            font-size: 0.9rem;
            border: 1px solid rgba(255, 255, 255, 0.15);
            transition: var(--transition);
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: rgba(233, 69, 96, 0.06);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.8rem;
        }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-block;
            background: rgba(233, 69, 96, 0.1);
            color: var(--accent-light);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        .badge-outline {
            background: transparent;
            border: 1px solid rgba(233, 69, 96, 0.25);
        }

        /* ===== Stats / Data ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 32px 16px;
            transition: var(--transition);
        }
        .stat-item:hover {
            background: var(--bg-card-hover);
            border-color: rgba(233, 69, 96, 0.2);
            transform: translateY(-4px);
        }
        .stat-item .stat-num {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -1px;
            line-height: 1.2;
        }
        .stat-item .stat-num span {
            color: var(--accent);
        }
        .stat-item .stat-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-top: 6px;
        }

        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-item .stat-num {
                font-size: 2rem;
            }
        }
        @media (max-width: 480px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 0 20px;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(233, 69, 96, 0.15);
        }
        .faq-item summary {
            padding: 18px 0;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            list-style: none;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary i {
            color: var(--accent);
            font-size: 0.85rem;
            transition: var(--transition);
        }
        .faq-item[open] summary i {
            transform: rotate(180deg);
        }
        .faq-item .faq-answer {
            padding: 0 0 18px;
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(160deg, var(--primary) 0%, var(--secondary) 100%);
            border-radius: var(--radius-lg);
            padding: 60px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 50% 50%, rgba(233, 69, 96, 0.08) 0%, transparent 60%);
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .cta-section p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .btn-primary {
            font-size: 1rem;
            padding: 14px 36px;
        }

        @media (max-width: 768px) {
            .cta-section {
                padding: 40px 24px;
            }
            .cta-section h2 {
                font-size: 1.4rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary-dark);
            border-top: 1px solid var(--border-light);
            padding: 56px 0 28px;
            margin-top: 72px;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .site-footer h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .site-footer p {
            font-size: 0.88rem;
            color: var(--text-weak);
            line-height: 1.7;
        }
        .site-footer ul li {
            margin-bottom: 10px;
        }
        .site-footer ul li a {
            font-size: 0.88rem;
            color: var(--text-secondary);
            transition: var(--transition);
        }
        .site-footer ul li a:hover {
            color: var(--accent-light);
            padding-left: 4px;
        }
        .site-footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            border-top: 1px solid var(--border-light);
            font-size: 0.8rem;
            color: var(--text-weak);
            flex-wrap: wrap;
            gap: 12px;
        }
        .site-footer .footer-bottom .legal {
            display: flex;
            gap: 20px;
        }
        .site-footer .footer-bottom .legal a {
            color: var(--text-weak);
        }
        .site-footer .footer-bottom .legal a:hover {
            color: var(--text-secondary);
        }
        .site-footer .copyright {
            font-size: 0.78rem;
            opacity: 0.7;
        }

        @media (max-width: 768px) {
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 480px) {
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }

        /* ===== Tool / Misc ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mb-8 {
            margin-bottom: 8px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .gap-8 {
            gap: 8px;
        }
        .gap-12 {
            gap: 12px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }

        /* ===== Category-specific accent ===== */
        .cat-accent {
            color: var(--accent-light);
        }
        .cat-bg-accent {
            background: rgba(233, 69, 96, 0.08);
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.82rem;
            color: var(--text-weak);
            margin-bottom: 32px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-secondary);
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb i {
            font-size: 0.6rem;
            color: var(--text-weak);
        }

        @media (max-width: 640px) {
            .breadcrumb {
                font-size: 0.75rem;
                margin-bottom: 20px;
            }
        }

        /* ===== Tab / Filter bar ===== */
        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 32px;
        }
        .filter-bar .filter-btn {
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 500;
            color: var(--text-secondary);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .filter-bar .filter-btn:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.08);
        }
        .filter-bar .filter-btn.active {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
            box-shadow: 0 4px 12px rgba(233, 69, 96, 0.25);
        }

        /* ===== Topic List ===== */
        .topic-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }
        .topic-item {
            display: flex;
            align-items: center;
            gap: 14px;
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            padding: 16px 20px;
            transition: var(--transition);
        }
        .topic-item:hover {
            background: var(--bg-card-hover);
            border-color: rgba(233, 69, 96, 0.15);
            transform: translateY(-2px);
        }
        .topic-item .topic-icon {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: rgba(233, 69, 96, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .topic-item .topic-info h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-primary);
        }
        .topic-item .topic-info span {
            font-size: 0.78rem;
            color: var(--text-weak);
        }

        @media (max-width: 640px) {
            .topic-list {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Empty state / Loading placeholder ===== */
        .empty-state {
            text-align: center;
            padding: 60px 20px;
            color: var(--text-weak);
        }
        .empty-state i {
            font-size: 3rem;
            margin-bottom: 16px;
            opacity: 0.3;
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #0f0e1a;
            --primary-light: #1a1a2e;
            --accent: #e8c547;
            --accent-hover: #d4b032;
            --bg: #f4f5f7;
            --bg-card: #ffffff;
            --text: #1a1a2e;
            --text-weak: #6b7280;
            --text-light: #9ca3af;
            --border: #e5e7eb;
            --border-light: #f0f0f0;
            --radius: 14px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-hover: 0 12px 40px rgba(0,0,0,0.10);
            --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --nav-height: 68px;
            --max-width: 1200px;
            --content-width: 780px;
        }

        /* ===== 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);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--accent-hover); }
        a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        button { cursor: pointer; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--primary); }
        h1 { font-size: 2.2rem; }
        h2 { font-size: 1.6rem; }
        h3 { font-size: 1.25rem; }
        p { margin-bottom: 1rem; color: var(--text); }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(15,14,26,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            height: var(--nav-height);
            display: flex;
            align-items: center;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo i { color: var(--accent); font-size: 1.3rem; }
        .logo:hover { color: var(--accent); }
        .nav-tabs {
            display: flex;
            align-items: center;
            gap: 4px;
            background: rgba(255,255,255,0.06);
            padding: 4px;
            border-radius: 40px;
        }
        .nav-tabs a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: 32px;
            font-size: 0.9rem;
            font-weight: 500;
            color: rgba(255,255,255,0.7);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-tabs a i { font-size: 0.85rem; }
        .nav-tabs a:hover {
            color: #fff;
            background: rgba(255,255,255,0.10);
        }
        .nav-tabs a.active {
            background: var(--accent);
            color: var(--primary);
            font-weight: 600;
            box-shadow: 0 4px 14px rgba(232,197,71,0.30);
        }
        .nav-tabs a.active:hover { background: var(--accent-hover); color: var(--primary); }
        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 22px;
            border-radius: 32px;
            background: var(--accent);
            color: var(--primary);
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition);
            box-shadow: 0 4px 14px rgba(232,197,71,0.25);
        }
        .nav-cta:hover { background: var(--accent-hover); color: var(--primary); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(232,197,71,0.35); }
        .nav-cta i { font-size: 0.85rem; }

        /* Mobile menu toggle */
        .menu-toggle {
            display: none;
            color: #fff;
            font-size: 1.5rem;
            padding: 8px 12px;
            border-radius: 8px;
            background: rgba(255,255,255,0.06);
            transition: background var(--transition);
        }
        .menu-toggle:hover { background: rgba(255,255,255,0.12); }

        /* ===== Hero / Article Header ===== */
        .article-hero {
            background: linear-gradient(135deg, #0f0e1a 0%, #1a1a2e 60%, #16213e 100%);
            padding: 60px 0 50px;
            position: relative;
            overflow: hidden;
        }
        .article-hero::after {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(232,197,71,0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        .article-hero .container { position: relative; z-index: 1; }
        .article-hero .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.5);
            margin-bottom: 20px;
        }
        .article-hero .breadcrumb a { color: rgba(255,255,255,0.6); }
        .article-hero .breadcrumb a:hover { color: var(--accent); }
        .article-hero .breadcrumb span { color: rgba(255,255,255,0.35); }
        .article-hero .category-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            border-radius: 20px;
            background: rgba(232,197,71,0.15);
            color: var(--accent);
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 16px;
            border: 1px solid rgba(232,197,71,0.20);
        }
        .article-hero .category-badge i { font-size: 0.75rem; }
        .article-hero h1 {
            font-size: 2.6rem;
            color: #fff;
            max-width: 840px;
            line-height: 1.25;
            margin-bottom: 20px;
            font-weight: 800;
            letter-spacing: -0.5px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 20px;
            color: rgba(255,255,255,0.6);
            font-size: 0.9rem;
        }
        .article-meta span { display: flex; align-items: center; gap: 6px; }
        .article-meta i { font-size: 0.8rem; color: var(--accent); opacity: 0.7; }

        /* ===== Main Content ===== */
        .article-main {
            padding: 50px 0 60px;
        }
        .article-content-wrap {
            max-width: var(--content-width);
            margin: 0 auto;
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 48px 52px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
        }
        .article-body h2 { margin-top: 2rem; margin-bottom: 0.8rem; font-size: 1.5rem; }
        .article-body h3 { margin-top: 1.6rem; margin-bottom: 0.6rem; font-size: 1.2rem; }
        .article-body p { margin-bottom: 1.2rem; line-height: 1.85; color: #2d2d3a; }
        .article-body ul, .article-body ol { margin-bottom: 1.2rem; padding-left: 1.6rem; }
        .article-body ul { list-style: disc; }
        .article-body ol { list-style: decimal; }
        .article-body li { margin-bottom: 0.4rem; line-height: 1.7; color: #2d2d3a; }
        .article-body img { margin: 1.5rem 0; border-radius: var(--radius-sm); box-shadow: 0 2px 12px rgba(0,0,0,0.06); }
        .article-body blockquote {
            border-left: 4px solid var(--accent);
            background: #f9f7f0;
            padding: 16px 24px;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: #4a4a5a;
            font-style: italic;
        }
        .article-body code {
            background: #f1f1f4;
            padding: 2px 10px;
            border-radius: 4px;
            font-size: 0.9em;
            color: #e74c3c;
        }
        .article-body pre {
            background: #1a1a2e;
            color: #e8e8f0;
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            margin: 1.5rem 0;
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .article-body a { color: #2563eb; text-decoration: underline; }
        .article-body a:hover { color: #1d4ed8; }

        /* ===== Article Footer ===== */
        .article-footer {
            max-width: var(--content-width);
            margin: 32px auto 0;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 20px 0;
            border-top: 1px solid var(--border);
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-tags .tag {
            padding: 4px 14px;
            border-radius: 20px;
            background: var(--bg);
            border: 1px solid var(--border);
            font-size: 0.8rem;
            color: var(--text-weak);
            transition: all var(--transition);
        }
        .article-tags .tag:hover { border-color: var(--accent); color: var(--primary); background: rgba(232,197,71,0.06); }
        .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: var(--bg);
            border: 1px solid var(--border);
            color: var(--text-weak);
            transition: all var(--transition);
        }
        .article-share a:hover { background: var(--accent); border-color: var(--accent); color: var(--primary); }

        /* ===== Article Navigation (prev/next) ===== */
        .article-nav {
            max-width: var(--content-width);
            margin: 40px auto 0;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .article-nav a {
            display: flex;
            flex-direction: column;
            padding: 20px 24px;
            border-radius: var(--radius);
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow);
            transition: all var(--transition);
        }
        .article-nav a:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); border-color: var(--accent); }
        .article-nav .nav-label { font-size: 0.75rem; color: var(--text-weak); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 4px; }
        .article-nav .nav-title { font-weight: 600; color: var(--primary); font-size: 0.95rem; line-height: 1.4; }
        .article-nav .nav-next { text-align: right; }

        /* ===== Related Posts ===== */
        .related-section {
            padding: 60px 0 50px;
            background: var(--bg);
        }
        .related-section .section-title {
            text-align: center;
            margin-bottom: 36px;
        }
        .related-section .section-title h2 { font-size: 1.6rem; }
        .related-section .section-title p { color: var(--text-weak); font-size: 0.95rem; margin-top: 6px; }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow);
            transition: all var(--transition);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: rgba(232,197,71,0.20); }
        .related-card .card-img {
            height: 180px;
            background: linear-gradient(135deg, #1a1a2e, #2a2a4e);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255,255,255,0.15);
            font-size: 2.5rem;
            position: relative;
            overflow: hidden;
        }
        .related-card .card-img::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.30));
        }
        .related-card .card-img i { position: relative; z-index: 1; }
        .related-card .card-body { padding: 20px 22px 24px; }
        .related-card .card-body .cat-tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 12px;
            background: rgba(232,197,71,0.12);
            color: #b89a2e;
            font-size: 0.7rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .related-card .card-body h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; line-height: 1.4; }
        .related-card .card-body h3 a { color: var(--primary); }
        .related-card .card-body h3 a:hover { color: var(--accent-hover); }
        .related-card .card-body p { font-size: 0.88rem; color: var(--text-weak); margin-bottom: 12px; }
        .related-card .card-body .meta { font-size: 0.78rem; color: var(--text-light); display: flex; align-items: center; gap: 12px; }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 60px 0;
            background: linear-gradient(135deg, #0f0e1a 0%, #1a1a2e 100%);
            text-align: center;
        }
        .cta-section h2 { color: #fff; font-size: 1.8rem; margin-bottom: 12px; }
        .cta-section p { color: rgba(255,255,255,0.65); max-width: 560px; margin: 0 auto 28px; font-size: 1rem; }
        .cta-form {
            display: flex;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
            max-width: 500px;
            margin: 0 auto;
        }
        .cta-form input {
            flex: 1;
            min-width: 200px;
            padding: 12px 20px;
            border-radius: 40px;
            border: 1px solid rgba(255,255,255,0.15);
            background: rgba(255,255,255,0.06);
            color: #fff;
            font-size: 0.95rem;
            outline: none;
            transition: all var(--transition);
        }
        .cta-form input::placeholder { color: rgba(255,255,255,0.35); }
        .cta-form input:focus { border-color: var(--accent); background: rgba(255,255,255,0.10); }
        .cta-form button {
            padding: 12px 32px;
            border-radius: 40px;
            background: var(--accent);
            color: var(--primary);
            font-weight: 700;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .cta-form button:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 8px 24px rgba(232,197,71,0.30); }

        /* ===== Footer ===== */
        .site-footer {
            background: #0a0a14;
            color: rgba(255,255,255,0.7);
            padding: 56px 0 0;
            border-top: 1px solid rgba(255,255,255,0.04);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-grid h4 {
            font-size: 1rem;
            color: #fff;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-grid p { font-size: 0.88rem; color: rgba(255,255,255,0.5); line-height: 1.7; }
        .footer-grid ul li { margin-bottom: 8px; }
        .footer-grid ul li a { color: rgba(255,255,255,0.5); font-size: 0.88rem; transition: color var(--transition); }
        .footer-grid ul li a:hover { color: var(--accent); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding: 20px 0;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            font-size: 0.82rem;
            color: rgba(255,255,255,0.35);
        }
        .footer-bottom .copyright { color: rgba(255,255,255,0.35); }
        .footer-bottom .legal { display: flex; gap: 20px; }
        .footer-bottom .legal a { color: rgba(255,255,255,0.35); font-size: 0.82rem; }
        .footer-bottom .legal a:hover { color: var(--accent); }

        /* ===== Not Found State ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 24px;
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
        }
        .not-found-box i { font-size: 3rem; color: var(--text-light); margin-bottom: 20px; }
        .not-found-box h2 { font-size: 1.6rem; margin-bottom: 12px; }
        .not-found-box p { color: var(--text-weak); margin-bottom: 24px; }
        .not-found-box .btn-home {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 40px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            transition: all var(--transition);
        }
        .not-found-box .btn-home:hover { background: var(--primary-light); transform: translateY(-2px); box-shadow: var(--shadow-hover); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .related-grid { grid-template-columns: repeat(2, 1fr); }
            .article-hero h1 { font-size: 2rem; }
        }
        @media (max-width: 768px) {
            .nav-tabs { display: none; }
            .menu-toggle { display: inline-flex; }
            .nav-tabs.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: rgba(15,14,26,0.98);
                backdrop-filter: blur(16px);
                padding: 16px;
                border-radius: 0 0 var(--radius) var(--radius);
                border-bottom: 1px solid rgba(255,255,255,0.06);
                gap: 6px;
                box-shadow: 0 20px 40px rgba(0,0,0,0.30);
            }
            .nav-tabs.open a { width: 100%; justify-content: center; padding: 12px 18px; }
            .header-inner .nav-cta { display: none; }
            .article-hero { padding: 40px 0 30px; }
            .article-hero h1 { font-size: 1.6rem; }
            .article-body { padding: 28px 20px; }
            .article-meta { gap: 12px; font-size: 0.8rem; }
            .article-nav { grid-template-columns: 1fr; gap: 12px; }
            .related-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
            .cta-section h2 { font-size: 1.4rem; }
            .cta-form { flex-direction: column; align-items: center; }
            .cta-form input { width: 100%; min-width: unset; }
            .article-hero .breadcrumb { font-size: 0.75rem; }
            .article-content-wrap { padding: 0; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .article-hero h1 { font-size: 1.3rem; }
            .article-body { padding: 20px 16px; }
            .article-body h2 { font-size: 1.2rem; }
            .article-footer { flex-direction: column; align-items: flex-start; gap: 16px; }
            .article-share { width: 100%; justify-content: flex-start; }
            .related-card .card-body { padding: 16px 18px 20px; }
            .not-found-box { padding: 40px 16px; }
        }
        @media (max-width: 768px) and (min-width: 521px) {
            .article-body { padding: 32px 28px; }
        }
        /* When menu is open on mobile, show nav-cta inside */
        @media (max-width: 768px) {
            .nav-tabs.open .nav-cta-mobile {
                display: inline-flex;
                margin-top: 8px;
                justify-content: center;
            }
        }
        .nav-cta-mobile { display: none; }
        @media (max-width: 768px) {
            .nav-tabs.open .nav-cta-mobile {
                display: flex;
                width: 100%;
                padding: 12px 18px;
                border-radius: 32px;
                background: var(--accent);
                color: var(--primary);
                font-weight: 600;
                justify-content: center;
                gap: 8px;
            }
        }