/* roulang page: index */
/* ===== 设计变量与基础重置 ===== */
        :root {
            --color-primary: #4f46e5;
            --color-primary-dark: #3730a3;
            --color-primary-light: #818cf8;
            --color-accent: #f59e0b;
            --color-accent-dark: #d97706;
            --color-bg: #f8fafc;
            --color-bg-card: #ffffff;
            --color-bg-dark: #0f172a;
            --color-text: #1e293b;
            --color-text-light: #64748b;
            --color-text-white: #f1f5f9;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --radius-sm: 0.375rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --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 20px 60px rgba(0,0,0,0.15);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --spacing-section: 5rem;
        }

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

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

        body {
            font-family: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            background-color: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            font-size: 1rem;
        }

        img { max-width: 100%; height: auto; display: block; }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        button { cursor: pointer; font-family: inherit; }
        input, textarea { font-family: inherit; }

        /* ===== 容器 ===== */
        .container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

        /* ===== 导航 ===== */
        .nav-top {
            background: #ffffff;
            border-bottom: 1px solid var(--color-border);
            padding: 0.625rem 0;
            position: relative;
            z-index: 50;
        }
        .nav-top .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.75rem;
        }
        .nav-logo {
            font-size: 1.5rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.02em;
            line-height: 1.2;
        }
        .nav-logo span { font-weight: 300; color: var(--color-text-light); -webkit-text-fill-color: var(--color-text-light); }
        .nav-search { display: flex; align-items: center; gap: 0.5rem; }
        .nav-search input {
            border: 1px solid var(--color-border);
            border-radius: 9999px;
            padding: 0.45rem 1rem 0.45rem 2.2rem;
            font-size: 0.875rem;
            background: var(--color-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cline x1='21' y1='21' x2='16.65' y2='16.65'/%3E%3C/svg%3E") no-repeat 0.75rem center;
            background-size: 1rem;
            width: 200px;
            transition: all var(--transition);
            outline: none;
        }
        .nav-search input:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(79,70,229,0.12); width: 240px; }
        .nav-cta {
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            color: #fff;
            padding: 0.5rem 1.5rem;
            border-radius: 9999px;
            font-size: 0.875rem;
            font-weight: 600;
            border: none;
            transition: all var(--transition);
            white-space: nowrap;
            box-shadow: 0 2px 8px rgba(79,70,229,0.25);
        }
        .nav-cta:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(79,70,229,0.35); }
        .nav-cta:active { transform: translateY(0); }

        .nav-tabs {
            background: #ffffff;
            border-bottom: 1px solid var(--color-border);
            padding: 0 0;
            position: sticky;
            top: 0;
            z-index: 40;
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
        }
        .nav-tabs .container { display: flex; align-items: center; gap: 0.25rem; overflow-x: auto; padding: 0.5rem 1.5rem; scrollbar-width: none; }
        .nav-tabs .container::-webkit-scrollbar { display: none; }
        .nav-tab {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.5rem 1.25rem;
            border-radius: 9999px;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--color-text-light);
            white-space: nowrap;
            transition: all var(--transition);
            border: 1px solid transparent;
        }
        .nav-tab:hover { color: var(--color-primary); background: #f1f4ff; border-color: #e0e7ff; }
        .nav-tab.active { color: #fff; background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark)); border-color: transparent; box-shadow: 0 2px 10px rgba(79,70,229,0.25); }
        .nav-tab i { font-size: 0.8rem; }

        /* ===== Hero ===== */
        .hero {
            padding: 5rem 0 4rem;
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #1e1b4b 100%);
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -40%; right: -20%;
            width: 70%; height: 140%;
            background: radial-gradient(ellipse at center, rgba(99,102,241,0.15) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -30%; left: -10%;
            width: 60%; height: 120%;
            background: radial-gradient(ellipse at center, rgba(245,158,11,0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero .container { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
        .hero-content h1 { font-size: 3rem; font-weight: 800; line-height: 1.15; color: #fff; margin-bottom: 1.25rem; letter-spacing: -0.02em; }
        .hero-content h1 .highlight { background: linear-gradient(135deg, var(--color-accent), #f97316); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero-content p { font-size: 1.125rem; color: #94a3b8; line-height: 1.8; margin-bottom: 2rem; max-width: 520px; }
        .hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
        .hero-btn-primary {
            display: inline-flex; align-items: center; gap: 0.5rem;
            background: linear-gradient(135deg, var(--color-accent), #f97316);
            color: #0f172a; font-weight: 700; padding: 0.85rem 2rem;
            border-radius: 9999px; font-size: 1rem; border: none;
            transition: all var(--transition); box-shadow: 0 4px 20px rgba(245,158,11,0.3);
        }
        .hero-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(245,158,11,0.4); }
        .hero-btn-secondary {
            display: inline-flex; align-items: center; gap: 0.5rem;
            border: 1px solid rgba(255,255,255,0.2); color: #e2e8f0; font-weight: 500;
            padding: 0.85rem 2rem; border-radius: 9999px; font-size: 1rem;
            transition: all var(--transition); background: rgba(255,255,255,0.05);
        }
        .hero-btn-secondary:hover { border-color: rgba(255,255,255,0.4); background: rgba(255,255,255,0.1); }
        .hero-visual {
            display: flex; justify-content: center; align-items: center;
            position: relative;
        }
        .hero-card {
            background: rgba(255,255,255,0.05);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: var(--radius-xl);
            padding: 2.5rem 2rem;
            width: 100%; max-width: 420px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
        }
        .hero-card .stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
        .hero-card .stat-item { text-align: center; }
        .hero-card .stat-number { font-size: 2rem; font-weight: 800; color: #fff; line-height: 1.2; }
        .hero-card .stat-label { font-size: 0.8rem; color: #94a3b8; margin-top: 0.25rem; }
        .hero-card .divider { height: 1px; background: rgba(255,255,255,0.1); margin: 1.5rem 0; }
        .hero-card .badge-row { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; }
        .hero-card .badge {
            background: rgba(99,102,241,0.2);
            border: 1px solid rgba(99,102,241,0.25);
            color: #a5b4fc;
            padding: 0.25rem 0.85rem;
            border-radius: 9999px;
            font-size: 0.75rem;
            font-weight: 500;
        }

        /* ===== 板块通用 ===== */
        .section { padding: var(--spacing-section) 0; }
        .section-title { font-size: 2rem; font-weight: 800; margin-bottom: 0.75rem; letter-spacing: -0.01em; }
        .section-subtitle { font-size: 1.05rem; color: var(--color-text-light); max-width: 600px; margin-bottom: 2.5rem; line-height: 1.7; }
        .section-header { text-align: center; margin-bottom: 3rem; }
        .section-header .section-title { margin-bottom: 0.5rem; }
        .section-header .section-subtitle { margin: 0 auto; }

        /* ===== 卡片通用 ===== */
        .card {
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            padding: 1.75rem;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: #c7d2fe; }
        .card-icon { width: 3rem; height: 3rem; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; font-size: 1.25rem; margin-bottom: 1rem; }
        .card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.5rem; }
        .card p { color: var(--color-text-light); font-size: 0.925rem; line-height: 1.7; }

        /* ===== 网格 ===== */
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }

        /* ===== 分类入口卡片 ===== */
        .cat-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
            padding: 2rem 1.75rem;
            text-align: center;
        }
        .cat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--color-primary-light); }
        .cat-card .icon-wrap {
            width: 4rem; height: 4rem; border-radius: 50%;
            display: flex; align-items: center; justify-content: center;
            margin: 0 auto 1.25rem;
            font-size: 1.5rem;
            transition: all var(--transition);
        }
        .cat-card:nth-child(1) .icon-wrap { background: #eef2ff; color: var(--color-primary); }
        .cat-card:nth-child(2) .icon-wrap { background: #fffbeb; color: var(--color-accent); }
        .cat-card:nth-child(3) .icon-wrap { background: #f0fdf4; color: #16a34a; }
        .cat-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.5rem; }
        .cat-card p { font-size: 0.9rem; color: var(--color-text-light); margin-bottom: 1.25rem; line-height: 1.6; }
        .cat-card .tag {
            display: inline-block;
            padding: 0.2rem 0.8rem;
            border-radius: 9999px;
            font-size: 0.75rem;
            font-weight: 500;
            background: var(--color-bg);
            color: var(--color-text-light);
            border: 1px solid var(--color-border);
        }

        /* ===== 资讯列表 ===== */
        .post-card {
            display: flex;
            gap: 1.5rem;
            padding: 1.5rem 0;
            border-bottom: 1px solid var(--color-border-light);
            transition: all var(--transition);
        }
        .post-card:last-child { border-bottom: none; }
        .post-card:hover { padding-left: 0.5rem; }
        .post-meta { display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap; margin-bottom: 0.5rem; }
        .post-cat {
            display: inline-block;
            padding: 0.15rem 0.7rem;
            border-radius: 9999px;
            font-size: 0.7rem;
            font-weight: 600;
            background: #eef2ff;
            color: var(--color-primary);
        }
        .post-date { font-size: 0.8rem; color: var(--color-text-light); }
        .post-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.35rem; line-height: 1.4; }
        .post-card h3 a { color: var(--color-text); }
        .post-card h3 a:hover { color: var(--color-primary); }
        .post-excerpt { font-size: 0.9rem; color: var(--color-text-light); line-height: 1.7; }

        /* ===== 数据/流程 ===== */
        .step-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
        .step-card {
            text-align: center;
            padding: 2rem 1.25rem;
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .step-num {
            width: 2.5rem; height: 2.5rem;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            color: #fff;
            display: flex; align-items: center; justify-content: center;
            font-weight: 700; font-size: 0.95rem;
            margin: 0 auto 1rem;
        }
        .step-card h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.4rem; }
        .step-card p { font-size: 0.85rem; color: var(--color-text-light); line-height: 1.6; }

        /* ===== 统计数字 ===== */
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
        .stat-card {
            text-align: center;
            padding: 2rem 1rem;
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
        }
        .stat-card .num { font-size: 2.5rem; font-weight: 800; color: var(--color-primary); line-height: 1.2; }
        .stat-card .label { font-size: 0.9rem; color: var(--color-text-light); margin-top: 0.25rem; }

        /* ===== FAQ ===== */
        .faq-item {
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            margin-bottom: 0.75rem;
            overflow: hidden;
            transition: all var(--transition);
            background: var(--color-bg-card);
        }
        .faq-item:hover { border-color: #c7d2fe; }
        .faq-question {
            padding: 1.25rem 1.5rem;
            font-weight: 600;
            font-size: 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            background: transparent;
            border: none;
            width: 100%;
            text-align: left;
            color: var(--color-text);
            transition: background var(--transition);
        }
        .faq-question:hover { background: #f8faff; }
        .faq-question i { color: var(--color-primary); transition: transform var(--transition); font-size: 0.85rem; }
        .faq-answer {
            padding: 0 1.5rem 1.25rem;
            font-size: 0.925rem;
            color: var(--color-text-light);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer { display: block; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #1e1b4b 0%, #0f172a 100%);
            padding: 4rem 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%; right: -20%;
            width: 60%; height: 200%;
            background: radial-gradient(ellipse at center, rgba(99,102,241,0.12) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-section .container { position: relative; z-index: 2; text-align: center; }
        .cta-section h2 { font-size: 2.2rem; font-weight: 800; color: #fff; margin-bottom: 1rem; }
        .cta-section p { color: #94a3b8; font-size: 1.05rem; max-width: 540px; margin: 0 auto 2rem; line-height: 1.7; }
        .cta-section .btn-group { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
        .cta-btn-primary {
            display: inline-flex; align-items: center; gap: 0.5rem;
            background: linear-gradient(135deg, var(--color-accent), #f97316);
            color: #0f172a; font-weight: 700; padding: 0.85rem 2.2rem;
            border-radius: 9999px; font-size: 1rem; border: none;
            transition: all var(--transition); box-shadow: 0 4px 20px rgba(245,158,11,0.3);
        }
        .cta-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(245,158,11,0.4); }
        .cta-btn-secondary {
            display: inline-flex; align-items: center; gap: 0.5rem;
            border: 1px solid rgba(255,255,255,0.2); color: #e2e8f0; font-weight: 500;
            padding: 0.85rem 2.2rem; border-radius: 9999px; font-size: 1rem;
            transition: all var(--transition); background: rgba(255,255,255,0.05);
        }
        .cta-btn-secondary:hover { border-color: rgba(255,255,255,0.4); background: rgba(255,255,255,0.1); }

        /* ===== 页脚 ===== */
        .footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 3.5rem 0 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.05);
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2.5rem; }
        .footer-brand .footer-logo { font-size: 1.4rem; font-weight: 800; color: #fff; margin-bottom: 0.75rem; }
        .footer-brand p { font-size: 0.875rem; line-height: 1.7; max-width: 320px; }
        .footer h4 { color: #e2e8f0; font-size: 0.9rem; font-weight: 600; margin-bottom: 1rem; text-transform: uppercase; letter-spacing: 0.05em; }
        .footer ul { list-style: none; }
        .footer ul li { margin-bottom: 0.5rem; }
        .footer ul li a { font-size: 0.875rem; color: #94a3b8; transition: color var(--transition); }
        .footer ul li a:hover { color: var(--color-accent); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.75rem;
            font-size: 0.8rem;
        }
        .footer-bottom a { color: #64748b; }
        .footer-bottom a:hover { color: var(--color-accent); }

        /* ===== 移动端响应式 ===== */
        @media (max-width: 1024px) {
            .hero .container { grid-template-columns: 1fr; gap: 2rem; }
            .hero-content h1 { font-size: 2.5rem; }
            .hero-visual { order: -1; }
            .hero-card { max-width: 100%; }
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
            .step-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            :root { --spacing-section: 3rem; }
            .section-title { font-size: 1.6rem; }
            .hero { padding: 3rem 0 2.5rem; }
            .hero-content h1 { font-size: 1.8rem; }
            .hero-content p { font-size: 1rem; }
            .grid-3 { grid-template-columns: 1fr; }
            .grid-2 { grid-template-columns: 1fr; }
            .grid-4 { grid-template-columns: 1fr 1fr; }
            .stats-grid { grid-template-columns: 1fr 1fr; }
            .step-grid { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
            .nav-search input { width: 120px; }
            .nav-search input:focus { width: 160px; }
            .nav-top .container { flex-wrap: wrap; }
            .nav-tab { padding: 0.4rem 1rem; font-size: 0.8rem; }
            .post-card { flex-direction: column; gap: 0.75rem; }
            .hero-card { padding: 1.5rem; }
            .hero-card .stat-number { font-size: 1.5rem; }
            .cta-section h2 { font-size: 1.6rem; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 1rem; }
            .hero-content h1 { font-size: 1.5rem; }
            .nav-logo { font-size: 1.2rem; }
            .nav-search input { width: 100px; }
            .nav-search input:focus { width: 140px; }
            .nav-cta { padding: 0.4rem 1rem; font-size: 0.8rem; }
            .grid-4 { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: 1fr; }
            .step-grid { grid-template-columns: 1fr; }
            .hero-card .stats-grid { grid-template-columns: 1fr; }
            .hero-actions { flex-direction: column; }
            .hero-btn-primary, .hero-btn-secondary { width: 100%; justify-content: center; }
            .cta-section .btn-group { flex-direction: column; align-items: center; }
            .cta-btn-primary, .cta-btn-secondary { width: 100%; justify-content: center; }
        }

        /* ===== 工具类 ===== */
        .text-gradient { background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .text-gradient-accent { background: linear-gradient(135deg, var(--color-accent), #f97316); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .mb-0 { margin-bottom: 0; }
        .mt-1 { margin-top: 0.25rem; }
        .gap-2 { gap: 0.5rem; }

        /* ===== 淡入动画 ===== */
        @keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
        .animate-fade-up { animation: fadeUp 0.6s ease-out both; }
        .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: article */
:root {
            --primary: #4f46e5;
            --primary-light: #818cf8;
            --primary-dark: #4338ca;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border-light: #e2e8f0;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px -2px rgba(0,0,0,0.06);
            --transition-base: all 0.2s ease;
        }
        *,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
        html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
        body{font-family:'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,'Noto Sans SC',sans-serif;background:var(--bg-body);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
        img{max-width:100%;height:auto;display:block;border-radius:var(--radius-md)}
        a{color:inherit;text-decoration:none;transition:var(--transition-base)}
        button{cursor:pointer;font:inherit;border:none;background:none}
        input,textarea{font:inherit;outline:none;border:1px solid var(--border-light);border-radius:var(--radius-md);padding:0.625rem 1rem;background:#fff;transition:var(--transition-base);width:100%}
        input:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,0.12)}
        .container{max-width:1200px;margin:0 auto;padding:0 1.5rem}
        @media (max-width:640px){.container{padding:0 1rem}}

        /* header / top bar */
        .top-bar{background:linear-gradient(135deg,#1e1b4b 0%,#312e81 100%);color:#fff;padding:0.625rem 0;font-size:0.8125rem;line-height:1.4}
        .top-bar .container{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:0.5rem}
        .top-bar a{color:#c7d2fe;transition:var(--transition-base)}
        .top-bar a:hover{color:#fff}
        .top-bar .hot-tag{background:rgba(255,255,255,0.12);padding:0.125rem 0.625rem;border-radius:999px;font-size:0.75rem;color:#e0e7ff;display:inline-flex;align-items:center;gap:0.375rem}
        .top-bar .hot-tag i{color:#fbbf24;font-size:0.625rem}

        /* main header */
        .main-header{background:#fff;border-bottom:1px solid var(--border-light);position:sticky;top:0;z-index:50;box-shadow:var(--shadow-sm)}
        .main-header .container{display:flex;align-items:center;justify-content:space-between;padding-top:0.75rem;padding-bottom:0.75rem;gap:1rem}
        .site-logo{display:flex;align-items:center;gap:0.5rem;font-size:1.375rem;font-weight:800;color:var(--primary-dark);white-space:nowrap}
        .site-logo i{font-size:1.5rem;color:var(--primary)}
        .site-logo span{background:linear-gradient(135deg,#4f46e5,#7c3aed);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
        .header-actions{display:flex;align-items:center;gap:0.75rem;flex-shrink:0}
        .header-actions .search-box{position:relative;display:none}
        .header-actions .search-box input{width:200px;padding:0.5rem 0.75rem 0.5rem 2rem;border-radius:999px;font-size:0.8125rem;background:#f1f5f9;border:1px solid transparent}
        .header-actions .search-box input:focus{background:#fff;border-color:var(--primary-light);width:240px}
        .header-actions .search-box i{position:absolute;left:0.75rem;top:50%;transform:translateY(-50%);color:var(--text-muted);font-size:0.8125rem}
        .header-actions .btn-cta{background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff;padding:0.5rem 1.25rem;border-radius:999px;font-size:0.8125rem;font-weight:600;transition:var(--transition-base);box-shadow:0 2px 8px rgba(79,70,229,0.25);white-space:nowrap}
        .header-actions .btn-cta:hover{transform:translateY(-1px);box-shadow:0 4px 14px rgba(79,70,229,0.35)}
        .header-actions .btn-cta i{margin-right:0.375rem}

        /* nav tabs */
        .nav-tabs{background:#fff;border-bottom:1px solid var(--border-light)}
        .nav-tabs .container{display:flex;gap:0;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;padding:0 1.5rem}
        .nav-tabs .container::-webkit-scrollbar{display:none}
        .nav-tab{display:flex;align-items:center;gap:0.375rem;padding:0.75rem 1.125rem;font-size:0.875rem;font-weight:500;color:var(--text-secondary);border-bottom:2px solid transparent;white-space:nowrap;transition:var(--transition-base);flex-shrink:0}
        .nav-tab i{font-size:0.8125rem;opacity:0.7}
        .nav-tab:hover{color:var(--primary);background:#f8fafc}
        .nav-tab.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:600}
        .nav-tab.active i{opacity:1}
        @media (max-width:640px){.nav-tab{padding:0.625rem 0.875rem;font-size:0.8125rem}}

        /* breadcrumb */
        .breadcrumb{background:#fff;border-bottom:1px solid var(--border-light);padding:0.75rem 0;font-size:0.8125rem;color:var(--text-muted)}
        .breadcrumb .container{display:flex;align-items:center;gap:0.375rem;flex-wrap:wrap}
        .breadcrumb a{color:var(--text-secondary);transition:var(--transition-base)}
        .breadcrumb a:hover{color:var(--primary)}
        .breadcrumb .sep{color:var(--text-muted);font-size:0.625rem}
        .breadcrumb .current{color:var(--text-primary);font-weight:500;max-width:300px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

        /* article main */
        .article-wrapper{padding:2.5rem 0 3rem}
        .article-card{background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);overflow:hidden}
        .article-header{padding:2rem 2.5rem 1.5rem;border-bottom:1px solid var(--border-light)}
        .article-header .category-badge{display:inline-flex;align-items:center;gap:0.375rem;background:var(--primary);color:#fff;padding:0.25rem 0.875rem;border-radius:999px;font-size:0.75rem;font-weight:600;margin-bottom:1rem}
        .article-header .category-badge i{font-size:0.625rem}
        .article-header h1{font-size:2rem;font-weight:800;line-height:1.3;color:var(--text-primary);margin-bottom:1rem;letter-spacing:-0.01em}
        .article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:1rem;font-size:0.8125rem;color:var(--text-muted)}
        .article-meta .meta-item{display:flex;align-items:center;gap:0.375rem}
        .article-meta .meta-item i{font-size:0.75rem;opacity:0.6}
        .article-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--text-muted);opacity:0.4}
        .article-cover{margin:0;overflow:hidden;max-height:480px;background:#f1f5f9}
        .article-cover img{width:100%;height:auto;object-fit:cover;border-radius:0}
        .article-body{padding:2rem 2.5rem 2.5rem;font-size:1rem;line-height:1.9;color:var(--text-secondary)}
        .article-body p{margin-bottom:1.25rem}
        .article-body h2{font-size:1.375rem;font-weight:700;color:var(--text-primary);margin-top:2rem;margin-bottom:0.75rem;padding-bottom:0.5rem;border-bottom:2px solid var(--border-light)}
        .article-body h3{font-size:1.125rem;font-weight:600;color:var(--text-primary);margin-top:1.5rem;margin-bottom:0.5rem}
        .article-body ul,.article-body ol{padding-left:1.5rem;margin-bottom:1.25rem}
        .article-body li{margin-bottom:0.375rem}
        .article-body blockquote{border-left:4px solid var(--primary);background:#f8fafc;padding:1rem 1.5rem;margin:1.5rem 0;border-radius:0 var(--radius-md) var(--radius-md) 0;color:var(--text-secondary);font-style:normal}
        .article-body blockquote p:last-child{margin-bottom:0}
        .article-body a{color:var(--primary);text-decoration:underline;text-underline-offset:2px}
        .article-body a:hover{color:var(--primary-dark)}
        .article-body img{border-radius:var(--radius-md);margin:1.5rem auto;box-shadow:var(--shadow-sm)}
        .article-body pre{background:#1e293b;color:#e2e8f0;padding:1.25rem 1.5rem;border-radius:var(--radius-md);overflow-x:auto;margin:1.5rem 0;font-size:0.875rem;line-height:1.6}
        .article-body code{font-family:'Fira Code','Menlo','Monaco',monospace;font-size:0.875em}
        .article-body p code{background:#f1f5f9;padding:0.125rem 0.5rem;border-radius:0.25rem;color:var(--primary-dark)}

        /* article tags & share */
        .article-footer{padding:1.5rem 2.5rem 2rem;border-top:1px solid var(--border-light);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1rem}
        .article-tags{display:flex;flex-wrap:wrap;gap:0.5rem}
        .article-tags .tag{display:inline-flex;align-items:center;gap:0.25rem;background:#f1f5f9;padding:0.375rem 0.875rem;border-radius:999px;font-size:0.75rem;color:var(--text-secondary);transition:var(--transition-base)}
        .article-tags .tag i{font-size:0.625rem;color:var(--primary-light)}
        .article-tags .tag:hover{background:#e0e7ff;color:var(--primary)}
        .article-share{display:flex;align-items:center;gap:0.5rem}
        .article-share span{font-size:0.8125rem;color:var(--text-muted)}
        .article-share a{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;background:#f1f5f9;color:var(--text-secondary);transition:var(--transition-base);font-size:0.8125rem}
        .article-share a:hover{background:var(--primary);color:#fff;transform:translateY(-2px)}

        /* article nav (prev/next) */
        .article-nav{padding:1.5rem 2.5rem 2rem;border-top:1px solid var(--border-light);display:flex;flex-wrap:wrap;gap:1.5rem}
        .article-nav .nav-item{flex:1;min-width:200px}
        .article-nav .nav-item .label{font-size:0.75rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:0.05em;margin-bottom:0.375rem;display:flex;align-items:center;gap:0.375rem}
        .article-nav .nav-item .title{font-size:0.9375rem;font-weight:600;color:var(--text-primary);transition:var(--transition-base);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
        .article-nav .nav-item a:hover .title{color:var(--primary)}
        .article-nav .nav-item.next{text-align:right}
        .article-nav .nav-item.next .label{justify-content:flex-end}

        /* related section */
        .related-section{padding:2.5rem 0 0}
        .related-section .section-title{font-size:1.25rem;font-weight:700;color:var(--text-primary);margin-bottom:1.5rem;display:flex;align-items:center;gap:0.75rem}
        .related-section .section-title i{color:var(--primary);font-size:1.125rem}
        .related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1.25rem}
        .related-card{background:#fff;border-radius:var(--radius-md);box-shadow:var(--shadow-sm);overflow:hidden;transition:var(--transition-base);border:1px solid var(--border-light)}
        .related-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--primary-light)}
        .related-card .card-img{height:160px;background:#f1f5f9;overflow:hidden}
        .related-card .card-img img{width:100%;height:100%;object-fit:cover;transition:transform 0.3s ease}
        .related-card:hover .card-img img{transform:scale(1.05)}
        .related-card .card-body{padding:1rem 1.125rem 1.125rem}
        .related-card .card-body .cat{font-size:0.6875rem;color:var(--primary);font-weight:600;text-transform:uppercase;letter-spacing:0.04em;margin-bottom:0.25rem;display:flex;align-items:center;gap:0.25rem}
        .related-card .card-body .cat i{font-size:0.5625rem}
        .related-card .card-body h3{font-size:0.9375rem;font-weight:600;line-height:1.4;color:var(--text-primary);margin-bottom:0.5rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
        .related-card .card-body h3 a{color:inherit}
        .related-card .card-body h3 a:hover{color:var(--primary)}
        .related-card .card-body .time{font-size:0.75rem;color:var(--text-muted);display:flex;align-items:center;gap:0.375rem}

        /* empty state */
        .empty-state{text-align:center;padding:4rem 2rem}
        .empty-state i{font-size:3rem;color:var(--text-muted);margin-bottom:1rem;opacity:0.5}
        .empty-state h2{font-size:1.25rem;font-weight:600;color:var(--text-primary);margin-bottom:0.5rem}
        .empty-state p{color:var(--text-muted);margin-bottom:1.5rem}
        .empty-state .btn-back{display:inline-flex;align-items:center;gap:0.5rem;background:var(--primary);color:#fff;padding:0.625rem 1.5rem;border-radius:999px;font-weight:600;transition:var(--transition-base)}
        .empty-state .btn-back:hover{background:var(--primary-dark);transform:translateY(-1px)}

        /* footer */
        .footer{background:#0f172a;color:#cbd5e1;padding:3.5rem 0 0;margin-top:3rem}
        .footer .footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:2.5rem}
        @media (max-width:768px){.footer .footer-grid{grid-template-columns:1fr 1fr;gap:2rem}}
        @media (max-width:520px){.footer .footer-grid{grid-template-columns:1fr;gap:1.5rem}}
        .footer .footer-brand .footer-logo{font-size:1.25rem;font-weight:800;color:#fff;margin-bottom:0.75rem;background:linear-gradient(135deg,#a5b4fc,#c4b5fd);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
        .footer .footer-brand p{font-size:0.875rem;line-height:1.7;color:#94a3b8;max-width:360px}
        .footer h4{font-size:0.8125rem;font-weight:700;color:#e2e8f0;text-transform:uppercase;letter-spacing:0.04em;margin-bottom:1rem;padding-bottom:0.5rem;border-bottom:1px solid rgba(255,255,255,0.06)}
        .footer ul{list-style:none;padding:0}
        .footer ul li{margin-bottom:0.5rem}
        .footer ul li a{font-size:0.875rem;color:#94a3b8;transition:var(--transition-base);display:flex;align-items:center;gap:0.5rem}
        .footer ul li a:hover{color:#e2e8f0;padding-left:0.25rem}
        .footer ul li a i{font-size:0.75rem;width:1rem;text-align:center;opacity:0.6}
        .footer .footer-bottom{margin-top:2.5rem;padding:1.25rem 0;border-top:1px solid rgba(255,255,255,0.06);display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:0.75rem;font-size:0.8125rem;color:#64748b}
        .footer .footer-bottom a{color:#94a3b8}
        .footer .footer-bottom a:hover{color:#e2e8f0}
        .footer .footer-bottom span:last-child{display:flex;align-items:center;gap:0.5rem}

        /* responsive */
        @media (max-width:768px){
            .article-header{padding:1.5rem 1.25rem 1rem}
            .article-header h1{font-size:1.5rem}
            .article-body{padding:1.25rem 1.25rem 1.75rem;font-size:0.9375rem;line-height:1.8}
            .article-footer{padding:1.25rem;flex-direction:column;align-items:flex-start}
            .article-nav{padding:1.25rem;flex-direction:column;gap:1rem}
            .article-nav .nav-item.next{text-align:left}
            .article-nav .nav-item.next .label{justify-content:flex-start}
            .related-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}
            .header-actions .search-box{display:none}
            .top-bar .hot-tag span{display:none}
        }
        @media (max-width:520px){
            .article-header h1{font-size:1.25rem}
            .article-meta{gap:0.625rem;font-size:0.75rem}
            .article-body{padding:1rem 1rem 1.5rem;font-size:0.875rem}
            .related-grid{grid-template-columns:1fr}
            .site-logo{font-size:1.125rem}
            .header-actions .btn-cta{padding:0.375rem 0.875rem;font-size:0.75rem}
            .header-actions .btn-cta span{display:none}
        }

        /* skeleton animation */
        @keyframes shimmer{0%{background-position:-200% 0}100%{background-position:200% 0}}
        .skeleton{background:linear-gradient(90deg,#f1f5f9 25%,#e2e8f0 50%,#f1f5f9 75%);background-size:200% 100%;animation:shimmer 1.5s infinite}

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --color-primary: #1a4cf5;
            --color-primary-dark: #1239e0;
            --color-primary-light: #5993ff;
            --color-accent: #ec601e;
            --color-accent-dark: #b83512;
            --color-bg: #ffffff;
            --color-bg-alt: #f8faff;
            --color-bg-card: #ffffff;
            --color-text: #1a1a2e;
            --color-text-soft: #4a4a6a;
            --color-text-muted: #8888a8;
            --color-border: #e8ecf4;
            --color-border-light: #f0f2f8;
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 20px rgba(0,0,0,0.05);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
        }

        /* ===== 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(--color-text);
            background: var(--color-bg);
        }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--color-primary); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, select, textarea { font-family: inherit; font-size: inherit; line-height: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--color-text); }
        h1 { font-size: 2.5rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.35rem; }
        h4 { font-size: 1.1rem; }
        p { color: var(--color-text-soft); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

        /* ===== 双层导航 ===== */
        .header-top {
            background: #ffffff;
            border-bottom: 1px solid var(--color-border-light);
            padding: 0.6rem 0;
        }
        .header-top .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.75rem;
        }
        .logo-wrap {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.25rem;
            font-weight: 800;
            flex-shrink: 0;
        }
        .logo-text {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--color-text);
            letter-spacing: -0.02em;
        }
        .logo-text span { color: var(--color-primary); }
        .logo-slogan { font-size: 0.75rem; color: var(--color-text-muted); letter-spacing: 0.3px; }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        .header-search {
            position: relative;
            display: flex;
            align-items: center;
        }
        .header-search input {
            padding: 0.45rem 1rem 0.45rem 2.4rem;
            border: 1px solid var(--color-border);
            border-radius: 999px;
            background: var(--color-bg-alt);
            font-size: 0.85rem;
            width: 200px;
            transition: var(--transition);
            outline: none;
            color: var(--color-text);
        }
        .header-search input:focus {
            border-color: var(--color-primary-light);
            box-shadow: 0 0 0 3px rgba(26, 76, 245, 0.08);
            width: 240px;
        }
        .header-search .search-icon {
            position: absolute;
            left: 0.85rem;
            color: var(--color-text-muted);
            font-size: 0.85rem;
            pointer-events: none;
        }
        .header-cta {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.45rem 1.2rem;
            background: var(--color-primary);
            color: #fff;
            border-radius: 999px;
            font-size: 0.85rem;
            font-weight: 600;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .header-cta:hover { background: var(--color-primary-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 14px rgba(26, 76, 245, 0.25); }
        .header-cta:active { transform: translateY(0); }

        /* 频道 Tabs 导航 */
        .nav-tabs-wrap {
            background: #ffffff;
            border-bottom: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .nav-tabs {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            padding: 0.5rem 0;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .nav-tabs::-webkit-scrollbar { display: none; }
        .nav-tab {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.5rem 1.2rem;
            border-radius: 999px;
            font-size: 0.88rem;
            font-weight: 500;
            color: var(--color-text-soft);
            white-space: nowrap;
            transition: var(--transition);
            border: 1px solid transparent;
            background: transparent;
        }
        .nav-tab i { font-size: 0.9rem; opacity: 0.7; }
        .nav-tab:hover { color: var(--color-primary); background: var(--color-bg-alt); border-color: var(--color-border-light); }
        .nav-tab.active, .nav-tab.active:hover {
            color: #fff;
            background: var(--color-primary);
            border-color: var(--color-primary);
            box-shadow: 0 4px 14px rgba(26, 76, 245, 0.20);
        }
        .nav-tab.active i { opacity: 1; }
        .nav-tab:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

        /* ===== 通用板块 ===== */
        .section { padding: 4.5rem 0; }
        .section-alt { background: var(--color-bg-alt); }
        .section-title { text-align: center; margin-bottom: 3rem; }
        .section-title h2 { font-size: 2rem; font-weight: 800; letter-spacing: -0.01em; position: relative; display: inline-block; }
        .section-title h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
            border-radius: 4px;
            margin: 0.75rem auto 0;
        }
        .section-title p { font-size: 1.05rem; max-width: 600px; margin: 1rem auto 0; color: var(--color-text-soft); }

        /* ===== Hero ===== */
        .hero-category {
            background: linear-gradient(135deg, #0b1a3a 0%, #132b6e 50%, #1a4cf5 100%);
            padding: 5rem 0 4rem;
            position: relative;
            overflow: hidden;
        }
        .hero-category::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(89, 147, 255, 0.15) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-category::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(236, 96, 30, 0.10) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-category .container { position: relative; z-index: 1; }
        .hero-category h1 {
            color: #fff;
            font-size: 2.8rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.2;
            margin-bottom: 1rem;
        }
        .hero-category p {
            color: rgba(255,255,255,0.8);
            font-size: 1.1rem;
            max-width: 640px;
            margin-bottom: 2rem;
            line-height: 1.8;
        }
        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem;
        }
        .hero-tag {
            display: inline-block;
            padding: 0.35rem 1rem;
            background: rgba(255,255,255,0.12);
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255,255,255,0.15);
            border-radius: 999px;
            color: rgba(255,255,255,0.9);
            font-size: 0.82rem;
            font-weight: 500;
            transition: var(--transition);
        }
        .hero-tag:hover { background: rgba(255,255,255,0.20); color: #fff; }

        /* ===== 卡片 ===== */
        .card {
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--color-border-light);
            padding: 1.75rem;
            transition: var(--transition);
        }
        .card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: var(--color-border); }
        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: #fff;
            margin-bottom: 1rem;
            flex-shrink: 0;
        }
        .card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 0.5rem; }
        .card p { font-size: 0.92rem; color: var(--color-text-soft); line-height: 1.7; }

        /* ===== 特色卡片网格 ===== */
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }

        /* ===== 统计数字 ===== */
        .stat-card {
            text-align: center;
            padding: 2rem 1rem;
            background: #fff;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
            transition: var(--transition);
        }
        .stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
        .stat-number {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--color-primary);
            line-height: 1.2;
            letter-spacing: -0.02em;
        }
        .stat-number .plus { font-size: 1.6rem; }
        .stat-label { font-size: 0.92rem; color: var(--color-text-soft); margin-top: 0.4rem; }

        /* ===== 流程步骤 ===== */
        .step-item {
            display: flex;
            gap: 1.25rem;
            align-items: flex-start;
            padding: 1.25rem 1.5rem;
            background: #fff;
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border-light);
            transition: var(--transition);
        }
        .step-item:hover { box-shadow: var(--shadow-md); border-color: var(--color-border); }
        .step-num {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 700;
            flex-shrink: 0;
        }
        .step-content h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.2rem; }
        .step-content p { font-size: 0.88rem; color: var(--color-text-soft); }

        /* ===== FAQ ===== */
        .faq-item {
            border: 1px solid var(--color-border-light);
            border-radius: var(--radius-md);
            background: #fff;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--color-border); box-shadow: var(--shadow-sm); }
        .faq-question {
            padding: 1.1rem 1.5rem;
            font-weight: 600;
            font-size: 0.98rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            background: #fff;
            transition: var(--transition);
            user-select: none;
        }
        .faq-question:hover { background: var(--color-bg-alt); }
        .faq-question .faq-toggle {
            font-size: 0.85rem;
            color: var(--color-primary);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-toggle { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 1.5rem 1.1rem;
            font-size: 0.9rem;
            color: var(--color-text-soft);
            line-height: 1.8;
            display: none;
        }
        .faq-item.open .faq-answer { display: block; }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, #0b1a3a 0%, #1a4cf5 100%);
            border-radius: var(--radius-xl);
            padding: 3.5rem 3rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
            border-radius: 50%;
        }
        .cta-block h2 { color: #fff; font-size: 1.8rem; font-weight: 800; margin-bottom: 0.75rem; position: relative; }
        .cta-block p { color: rgba(255,255,255,0.8); font-size: 1.05rem; max-width: 560px; margin: 0 auto 1.5rem; position: relative; }
        .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 2rem;
            background: #fff;
            color: var(--color-primary);
            border-radius: 999px;
            font-weight: 700;
            font-size: 0.95rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            position: relative;
        }
        .cta-btn:hover { background: var(--color-bg-alt); transform: translateY(-2px); box-shadow: 0 8px 25px rgba(0,0,0,0.15); color: var(--color-primary-dark); }
        .cta-btn:active { transform: translateY(0); }
        .cta-btn i { font-size: 0.9rem; }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.82rem;
            color: var(--color-text-muted);
            padding: 1rem 0;
            flex-wrap: wrap;
        }
        .breadcrumb a { color: var(--color-text-muted); }
        .breadcrumb a:hover { color: var(--color-primary); }
        .breadcrumb .sep { color: var(--color-text-muted); font-size: 0.7rem; }
        .breadcrumb .current { color: var(--color-text-soft); font-weight: 500; }

        /* ===== 页脚 ===== */
        .footer {
            background: #0f1729;
            color: rgba(255,255,255,0.7);
            padding: 3.5rem 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
            gap: 2.5rem;
            padding-bottom: 2.5rem;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .footer-logo {
            font-size: 1.4rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 0.75rem;
        }
        .footer-logo span { color: var(--color-primary-light); }
        .footer-brand p { font-size: 0.88rem; color: rgba(255,255,255,0.55); line-height: 1.8; max-width: 360px; }
        .footer h4 { color: #fff; font-size: 0.95rem; font-weight: 700; margin-bottom: 1.2rem; position: relative; padding-bottom: 0.5rem; }
        .footer h4::after { content: ''; position: absolute; bottom: 0; left: 0; width: 28px; height: 2px; background: var(--color-primary-light); border-radius: 2px; }
        .footer ul li { margin-bottom: 0.5rem; }
        .footer ul li a { color: rgba(255,255,255,0.55); font-size: 0.88rem; transition: var(--transition); }
        .footer ul li a:hover { color: #fff; padding-left: 3px; }
        .footer ul li a i { width: 1.2rem; color: var(--color-primary-light); }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.75rem;
            padding: 1.5rem 0;
            font-size: 0.82rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: #fff; }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
            .hero-category h1 { font-size: 2.2rem; }
        }
        @media (max-width: 768px) {
            .header-top .container { flex-direction: column; align-items: stretch; }
            .logo-wrap { justify-content: center; }
            .header-actions { justify-content: center; flex-wrap: wrap; }
            .header-search input { width: 160px; }
            .header-search input:focus { width: 180px; }
            .nav-tab { padding: 0.4rem 0.9rem; font-size: 0.82rem; }
            .section { padding: 3rem 0; }
            .section-title h2 { font-size: 1.6rem; }
            .hero-category { padding: 3.5rem 0 2.5rem; }
            .hero-category h1 { font-size: 1.8rem; }
            .hero-category p { font-size: 0.95rem; }
            .grid-3, .grid-2 { grid-template-columns: 1fr; }
            .grid-4 { grid-template-columns: 1fr 1fr; gap: 1rem; }
            .cta-block { padding: 2.5rem 1.5rem; }
            .cta-block h2 { font-size: 1.4rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .stat-number { font-size: 2rem; }
            .step-item { flex-direction: column; align-items: flex-start; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 1rem; }
            .header-search input { width: 130px; font-size: 0.8rem; }
            .header-search input:focus { width: 150px; }
            .header-cta { padding: 0.35rem 0.9rem; font-size: 0.78rem; }
            .nav-tab { padding: 0.3rem 0.7rem; font-size: 0.75rem; gap: 0.25rem; }
            .nav-tab i { font-size: 0.7rem; }
            .hero-category h1 { font-size: 1.5rem; }
            .grid-4 { grid-template-columns: 1fr; }
            .card { padding: 1.25rem; }
            .section-title h2 { font-size: 1.3rem; }
            .stat-number { font-size: 1.8rem; }
            .faq-question { font-size: 0.88rem; padding: 0.9rem 1.1rem; }
            .faq-answer { font-size: 0.84rem; padding: 0 1.1rem 0.9rem; }
            .cta-block h2 { font-size: 1.2rem; }
            .cta-btn { padding: 0.6rem 1.4rem; font-size: 0.85rem; }
        }

        /* ===== 工具类 ===== */
        .text-gradient { background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .gap-1 { gap: 0.25rem; }
        .gap-2 { gap: 0.5rem; }
        .gap-3 { gap: 0.75rem; }
        .gap-4 { gap: 1rem; }
        .gap-6 { gap: 1.5rem; }
        .mt-2 { margin-top: 0.5rem; }
        .mt-4 { margin-top: 1rem; }
        .mt-6 { margin-top: 1.5rem; }
        .mt-8 { margin-top: 2rem; }
        .mb-2 { margin-bottom: 0.5rem; }
        .mb-4 { margin-bottom: 1rem; }
        .mb-6 { margin-bottom: 1.5rem; }
        .text-center { text-align: center; }
        .flex { display: flex; }
        .flex-wrap { flex-wrap: wrap; }
        .items-center { align-items: center; }
        .justify-center { justify-content: center; }
        .justify-between { justify-content: space-between; }
        .w-full { width: 100%; }
        .hidden { display: none; }
        .block { display: block; }

        /* 微交互动画 */
        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .animate-fade-up { animation: fadeUp 0.6s ease-out 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: category2 */
:root {
            --brand-50: #eef7ff;
            --brand-100: #d9edff;
            --brand-200: #bce0ff;
            --brand-300: #8eccff;
            --brand-400: #53b0ff;
            --brand-500: #2b8fff;
            --brand-600: #1a6df5;
            --brand-700: #1457e1;
            --brand-800: #1646b6;
            --brand-900: #193d8f;
            --brand-950: #14275a;
            --accent-400: #f8a544;
            --accent-500: #f6891e;
            --accent-600: #e86e0d;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-muted: #8a8aa0;
            --bg-body: #f8fafc;
            --border-light: #e2e8f0;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 8px 32px rgba(0,0,0,0.10);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --transition: all 0.25s ease;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; background: var(--bg-body); color: var(--text-primary); line-height: 1.6; -webkit-font-smoothing: antialiased; }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, select, textarea { font-family: inherit; font-size: inherit; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        /* ---- Header & Nav ---- */
        .site-header {
            background: #ffffff;
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 2px 8px rgba(0,0,0,0.03);
            position: sticky; top: 0; z-index: 100;
        }
        .header-top {
            display: flex; align-items: center; justify-content: space-between;
            padding: 12px 0; gap: 16px; flex-wrap: wrap;
        }
        .logo {
            font-size: 1.5rem; font-weight: 800; letter-spacing: -0.5px;
            background: linear-gradient(135deg, var(--brand-600), var(--brand-800));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text;
            display: flex; align-items: center; gap: 8px;
        }
        .logo i { font-size: 1.3rem; color: var(--brand-500); -webkit-text-fill-color: var(--brand-500); }
        .header-actions { display: flex; align-items: center; gap: 12px; }
        .search-box {
            display: flex; align-items: center; background: var(--bg-body);
            border: 1px solid var(--border-light); border-radius: 40px;
            padding: 6px 16px; gap: 8px; transition: var(--transition);
        }
        .search-box:focus-within { border-color: var(--brand-400); box-shadow: 0 0 0 3px rgba(43,143,255,0.12); }
        .search-box input { border: none; background: transparent; outline: none; padding: 4px 0; width: 160px; color: var(--text-primary); }
        .search-box i { color: var(--text-muted); font-size: 0.9rem; }
        .btn-cta-small {
            background: linear-gradient(135deg, var(--accent-400), var(--accent-500));
            color: #fff; padding: 8px 20px; border-radius: 40px; font-weight: 600;
            font-size: 0.85rem; border: none; cursor: pointer; transition: var(--transition);
            box-shadow: 0 4px 12px rgba(246,137,30,0.3);
        }
        .btn-cta-small:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(246,137,30,0.4); }
        /* ---- Nav Tabs ---- */
        .nav-tabs { display: flex; gap: 4px; padding: 6px 0 0; overflow-x: auto; scrollbar-width: none; }
        .nav-tabs::-webkit-scrollbar { display: none; }
        .nav-tab {
            display: flex; align-items: center; gap: 6px; padding: 10px 20px;
            border-radius: 40px 40px 0 0; font-size: 0.9rem; font-weight: 500;
            color: var(--text-secondary); white-space: nowrap; transition: var(--transition);
            border: 1px solid transparent; border-bottom: none; background: transparent;
        }
        .nav-tab i { font-size: 0.85rem; }
        .nav-tab:hover { color: var(--brand-600); background: rgba(43,143,255,0.06); }
        .nav-tab.active {
            color: var(--brand-700); background: #fff; border-color: var(--border-light);
            font-weight: 600; box-shadow: 0 -2px 6px rgba(0,0,0,0.04);
        }
        .nav-tab.active i { color: var(--brand-500); }
        /* ---- Hero Section ---- */
        .hero-slim {
            background: linear-gradient(135deg, #f0f7ff 0%, #e6f0ff 100%);
            padding: 48px 0 40px; border-bottom: 1px solid var(--border-light);
        }
        .hero-slim h1 { font-size: 2.2rem; font-weight: 800; letter-spacing: -0.5px; line-height: 1.2; margin-bottom: 12px; }
        .hero-slim p { font-size: 1.05rem; color: var(--text-secondary); max-width: 640px; }
        .hero-badge { display: inline-flex; align-items: center; gap: 6px; background: rgba(43,143,255,0.12); color: var(--brand-700); padding: 4px 14px; border-radius: 40px; font-size: 0.8rem; font-weight: 600; margin-bottom: 16px; }
        /* ---- Section ---- */
        .section { padding: 64px 0; }
        .section-alt { background: #ffffff; }
        .section-title { font-size: 1.65rem; font-weight: 700; margin-bottom: 8px; letter-spacing: -0.3px; }
        .section-sub { color: var(--text-secondary); font-size: 1.0rem; max-width: 640px; margin-bottom: 36px; }
        .section-divider { width: 56px; height: 4px; background: linear-gradient(90deg, var(--brand-400), var(--brand-600)); border-radius: 4px; margin-bottom: 20px; }
        /* ---- Cards ---- */
        .card { background: #fff; border-radius: var(--radius-md); box-shadow: var(--shadow-sm); border: 1px solid var(--border-light); padding: 24px; transition: var(--transition); }
        .card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
        .card-icon { width: 48px; height: 48px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 1.3rem; margin-bottom: 16px; }
        .card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
        .card p { font-size: 0.92rem; color: var(--text-secondary); line-height: 1.6; }
        /* ---- Steps ---- */
        .step-card { display: flex; gap: 20px; align-items: flex-start; background: #fff; border-radius: var(--radius-md); padding: 24px; box-shadow: var(--shadow-sm); border: 1px solid var(--border-light); transition: var(--transition); }
        .step-card:hover { box-shadow: var(--shadow-md); }
        .step-num { flex-shrink: 0; width: 40px; height: 40px; border-radius: 50%; background: linear-gradient(135deg, var(--brand-400), var(--brand-600)); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.1rem; }
        .step-content h4 { font-size: 1.05rem; font-weight: 600; margin-bottom: 4px; }
        .step-content p { font-size: 0.9rem; color: var(--text-secondary); }
        /* ---- FAQ ---- */
        .faq-item { border-bottom: 1px solid var(--border-light); padding: 18px 0; }
        .faq-question { display: flex; justify-content: space-between; align-items: center; cursor: pointer; font-weight: 600; font-size: 1.0rem; gap: 12px; }
        .faq-question i { color: var(--brand-500); transition: var(--transition); font-size: 0.9rem; }
        .faq-answer { padding-top: 12px; color: var(--text-secondary); font-size: 0.92rem; line-height: 1.7; display: none; }
        .faq-item.open .faq-answer { display: block; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        /* ---- Tags ---- */
        .tag { display: inline-flex; align-items: center; gap: 4px; background: var(--brand-50); color: var(--brand-700); padding: 4px 12px; border-radius: 40px; font-size: 0.78rem; font-weight: 500; }
        .tag i { font-size: 0.7rem; }
        /* ---- CTA ---- */
        .cta-block { background: linear-gradient(135deg, var(--brand-600), var(--brand-800)); border-radius: var(--radius-lg); padding: 48px 40px; color: #fff; text-align: center; box-shadow: 0 12px 40px rgba(22,70,182,0.25); }
        .cta-block h2 { font-size: 1.8rem; font-weight: 700; margin-bottom: 12px; }
        .cta-block p { opacity: 0.9; max-width: 560px; margin: 0 auto 28px; font-size: 1.0rem; }
        .btn-cta-large { display: inline-flex; align-items: center; gap: 10px; background: #fff; color: var(--brand-800); padding: 14px 36px; border-radius: 48px; font-weight: 700; font-size: 1.05rem; transition: var(--transition); box-shadow: 0 4px 16px rgba(0,0,0,0.15); }
        .btn-cta-large:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(0,0,0,0.2); }
        /* ---- Footer ---- */
        .footer { background: #0f172a; color: #cbd5e1; padding: 48px 0 0; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 36px; padding-bottom: 32px; border-bottom: 1px solid #1e293b; }
        .footer-logo { font-size: 1.35rem; font-weight: 800; color: #fff; margin-bottom: 12px; background: linear-gradient(135deg, #60a5fa, #a78bfa); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .footer-brand p { font-size: 0.88rem; line-height: 1.7; opacity: 0.8; }
        .footer h4 { color: #f1f5f9; font-size: 0.95rem; font-weight: 600; margin-bottom: 16px; }
        .footer ul { list-style: none; padding: 0; }
        .footer ul li { margin-bottom: 10px; }
        .footer ul a { color: #94a3b8; font-size: 0.88rem; transition: var(--transition); display: flex; align-items: center; gap: 6px; }
        .footer ul a:hover { color: #60a5fa; }
        .footer-bottom { display: flex; justify-content: space-between; align-items: center; padding: 20px 0; flex-wrap: wrap; gap: 8px; font-size: 0.82rem; opacity: 0.7; }
        /* ---- Responsive ---- */
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
        }
        @media (max-width: 768px) {
            .header-top { flex-direction: column; align-items: stretch; gap: 10px; }
            .header-actions { justify-content: space-between; }
            .search-box input { width: 120px; }
            .nav-tabs { gap: 2px; }
            .nav-tab { padding: 8px 14px; font-size: 0.8rem; }
            .nav-tab i { display: none; }
            .hero-slim h1 { font-size: 1.6rem; }
            .hero-slim p { font-size: 0.92rem; }
            .section { padding: 40px 0; }
            .section-title { font-size: 1.35rem; }
            .cta-block { padding: 32px 20px; }
            .cta-block h2 { font-size: 1.4rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .step-card { flex-direction: column; }
        }
        @media (max-width: 520px) {
            .hero-slim { padding: 32px 0 28px; }
            .hero-slim h1 { font-size: 1.35rem; }
            .card { padding: 18px; }
            .btn-cta-large { padding: 12px 24px; font-size: 0.95rem; }
            .container { padding: 0 14px; }
        }
        /* ---- Utilities ---- */
        .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
        .grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
        @media (max-width: 768px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }
        .gap-16 { gap: 16px; }
        .mt-24 { margin-top: 24px; }
        .mb-24 { margin-bottom: 24px; }
        .text-center { text-align: center; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .rounded-full { border-radius: 9999px; }
        /* ---- Skeleton for JS interactions ---- */
        .faq-answer { display: none; }
        .faq-item.open .faq-answer { display: block; }
        /* ---- Alert / note ---- */
        .note-box { background: #fefce8; border-left: 4px solid var(--accent-400); padding: 16px 20px; border-radius: var(--radius-sm); font-size: 0.9rem; color: #6b5a1e; margin: 16px 0; }
        .note-box i { margin-right: 8px; color: var(--accent-500); }
        /* ---- Icon bg helper ---- */
        .icon-bg-blue { background: rgba(43,143,255,0.1); color: var(--brand-600); }
        .icon-bg-orange { background: rgba(246,137,30,0.1); color: var(--accent-600); }
        .icon-bg-green { background: rgba(16,185,129,0.1); color: #059669; }
        .icon-bg-purple { background: rgba(139,92,246,0.1); color: #7c3aed; }
        /* Smooth scroll */
        html { scroll-behavior: smooth; }

/* roulang page: category3 */
:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --accent: #dc2626;
            --bg-body: #f8fafc;
            --text-body: #1e293b;
            --text-muted: #64748b;
            --border-light: #e2e8f0;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
            --radius: 0.75rem;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif; background: var(--bg-body); color: var(--text-body); line-height: 1.6; }
        a { color: inherit; text-decoration: none; transition: color 0.2s; }
        img { max-width: 100%; height: auto; display: block; }
        button, input { font-family: inherit; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
        .section-padding { padding: 4rem 0; }
        .section-title { font-size: 2rem; font-weight: 700; color: #0f172a; margin-bottom: 0.75rem; letter-spacing: -0.02em; }
        .section-subtitle { font-size: 1.05rem; color: #64748b; max-width: 640px; margin-bottom: 2.5rem; line-height: 1.7; }
        .card { background: #ffffff; border-radius: var(--radius); box-shadow: var(--shadow-sm); border: 1px solid var(--border-light); transition: transform 0.25s ease, box-shadow 0.25s ease; }
        .card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .btn { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.7rem 1.8rem; border-radius: 9999px; font-weight: 600; font-size: 0.95rem; transition: all 0.2s; cursor: pointer; border: none; }
        .btn-primary { background: #2563eb; color: #fff; box-shadow: 0 2px 8px rgba(37,99,235,0.3); }
        .btn-primary:hover { background: #1d4ed8; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(37,99,235,0.35); }
        .btn-outline { background: transparent; color: #2563eb; border: 2px solid #2563eb; }
        .btn-outline:hover { background: #2563eb; color: #fff; transform: translateY(-2px); }
        .badge { display: inline-block; padding: 0.25rem 0.85rem; border-radius: 9999px; font-size: 0.8rem; font-weight: 500; background: #dbeafe; color: #1d4ed8; }
        .badge-hot { background: #fee2e2; color: #b91c1c; }
        .badge-new { background: #d1fae5; color: #065f46; }
        .tag { display: inline-block; padding: 0.3rem 1rem; border-radius: 9999px; font-size: 0.85rem; font-weight: 500; background: #f1f5f9; color: #475569; border: 1px solid #e2e8f0; transition: all 0.2s; cursor: pointer; }
        .tag:hover { background: #2563eb; color: #fff; border-color: #2563eb; }
        .tag.active { background: #2563eb; color: #fff; border-color: #2563eb; }
        .nav-tabs { display: flex; gap: 0.25rem; overflow-x: auto; padding: 0.5rem 0; scrollbar-width: none; -ms-overflow-style: none; }
        .nav-tabs::-webkit-scrollbar { display: none; }
        .nav-tab { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.55rem 1.2rem; border-radius: 9999px; font-size: 0.9rem; font-weight: 500; color: #475569; background: transparent; white-space: nowrap; transition: all 0.2s; border: 1px solid transparent; }
        .nav-tab i { font-size: 0.9rem; }
        .nav-tab:hover { background: #eef2ff; color: #1d4ed8; }
        .nav-tab.active { background: #2563eb; color: #fff; box-shadow: 0 2px 8px rgba(37,99,235,0.25); }
        .footer { background: #0f172a; color: #cbd5e1; padding: 3.5rem 0 1.5rem; margin-top: 0; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2.5rem; margin-bottom: 2.5rem; }
        .footer-logo { font-size: 1.3rem; font-weight: 700; color: #fff; margin-bottom: 0.75rem; letter-spacing: -0.01em; }
        .footer h4 { color: #f1f5f9; font-size: 0.95rem; font-weight: 600; margin-bottom: 1rem; }
        .footer ul { list-style: none; padding: 0; }
        .footer ul li { margin-bottom: 0.5rem; }
        .footer ul li a { color: #94a3b8; font-size: 0.9rem; transition: color 0.2s; }
        .footer ul li a:hover { color: #60a5fa; }
        .footer-bottom { border-top: 1px solid #1e293b; padding-top: 1.5rem; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.75rem; font-size: 0.85rem; color: #64748b; }
        .footer-bottom a { color: #94a3b8; }
        .footer-bottom a:hover { color: #60a5fa; }
        .hero-section { background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%); padding: 4rem 0 3.5rem; position: relative; overflow: hidden; }
        .hero-section::before { content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px; background: radial-gradient(circle, rgba(37,99,235,0.15) 0%, transparent 70%); border-radius: 50%; }
        .hero-section::after { content: ''; position: absolute; bottom: -30%; left: -10%; width: 400px; height: 400px; background: radial-gradient(circle, rgba(220,38,38,0.1) 0%, transparent 70%); border-radius: 50%; }
        .hero-content { position: relative; z-index: 1; }
        .hero-title { font-size: 2.6rem; font-weight: 800; color: #fff; line-height: 1.2; letter-spacing: -0.02em; margin-bottom: 1rem; }
        .hero-desc { font-size: 1.1rem; color: #cbd5e1; max-width: 600px; line-height: 1.7; margin-bottom: 1.5rem; }
        .hero-stats { display: flex; gap: 2rem; flex-wrap: wrap; margin-top: 2rem; }
        .hero-stat { text-align: center; }
        .hero-stat-number { font-size: 1.8rem; font-weight: 700; color: #f59e0b; }
        .hero-stat-label { font-size: 0.85rem; color: #94a3b8; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
        .faq-item { border-bottom: 1px solid #e2e8f0; padding: 1.25rem 0; }
        .faq-question { font-weight: 600; font-size: 1.05rem; color: #0f172a; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
        .faq-answer { margin-top: 0.75rem; color: #475569; line-height: 1.7; display: none; }
        .faq-item.open .faq-answer { display: block; }
        .faq-toggle { transition: transform 0.3s; }
        .faq-item.open .faq-toggle { transform: rotate(180deg); }
        .list-check { list-style: none; padding: 0; }
        .list-check li { display: flex; align-items: flex-start; gap: 0.6rem; margin-bottom: 0.75rem; font-size: 0.95rem; color: #334155; }
        .list-check li i { color: #10b981; margin-top: 0.2rem; flex-shrink: 0; }
        .stat-block { background: linear-gradient(135deg, #f8fafc, #eef2ff); border-radius: var(--radius); padding: 2rem; border: 1px solid #e2e8f0; }
        .stat-number { font-size: 2.2rem; font-weight: 800; color: #2563eb; line-height: 1.2; }
        .stat-label { font-size: 0.9rem; color: #64748b; margin-top: 0.25rem; }
        .cta-section { background: linear-gradient(135deg, #1e3a8a, #0f172a); padding: 3.5rem 0; text-align: center; }
        .cta-title { font-size: 2rem; font-weight: 700; color: #fff; margin-bottom: 0.75rem; }
        .cta-desc { font-size: 1.05rem; color: #cbd5e1; max-width: 560px; margin: 0 auto 1.5rem; }
        .breadcrumb { display: flex; align-items: center; gap: 0.5rem; font-size: 0.9rem; color: #94a3b8; margin-bottom: 1.5rem; flex-wrap: wrap; }
        .breadcrumb a { color: #94a3b8; }
        .breadcrumb a:hover { color: #60a5fa; }
        .breadcrumb span { color: #fff; }
        .breadcrumb i { font-size: 0.7rem; }
        .guide-card-img { height: 180px; background: linear-gradient(135deg, #1e293b, #334155); border-radius: var(--radius) var(--radius) 0 0; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 2.5rem; position: relative; overflow: hidden; }
        .guide-card-img .overlay { position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,0.6), transparent); }
        .guide-card-img .icon { position: relative; z-index: 1; }
        .guide-card-body { padding: 1.25rem; }
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .container { padding: 0 1rem; }
            .section-padding { padding: 2.5rem 0; }
            .section-title { font-size: 1.6rem; }
            .hero-title { font-size: 1.8rem; }
            .hero-stats { gap: 1.2rem; }
            .grid-3 { grid-template-columns: 1fr; }
            .grid-2 { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .nav-tabs { padding: 0.25rem 0; }
            .nav-tab { padding: 0.45rem 1rem; font-size: 0.8rem; }
            .cta-title { font-size: 1.5rem; }
            .hero-section { padding: 2.5rem 0 2rem; }
            .stat-block { padding: 1.25rem; }
            .stat-number { font-size: 1.6rem; }
        }
        @media (max-width: 520px) {
            .hero-title { font-size: 1.4rem; }
            .hero-desc { font-size: 0.95rem; }
            .hero-stat-number { font-size: 1.3rem; }
            .btn { padding: 0.5rem 1.2rem; font-size: 0.85rem; }
            .section-title { font-size: 1.3rem; }
        }