/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --nav-bg: #0b1120;
            --nav-text: #cbd5e1;
            --nav-hover: #f1f5f9;
            --nav-active: #ffffff;
            --nav-accent: #f97316;
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --accent: #f97316;
            --accent-light: #fb923c;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --text-body: #1e293b;
            --text-muted: #64748b;
            --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 30px rgba(0,0,0,0.12);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --transition: all 0.25s ease;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body { font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; background: var(--bg-body); color: var(--text-body); line-height: 1.6; }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        img { max-width: 100%; height: auto; display: block; }
        button { cursor: pointer; font: inherit; border: none; background: none; }
        input, textarea { font: inherit; }

        /* ===== Layout ===== */
        .app-wrapper { display: flex; min-height: 100vh; }
        .side-nav { position: fixed; top: 0; left: 0; width: 240px; height: 100vh; background: var(--nav-bg); z-index: 50; display: flex; flex-direction: column; transition: var(--transition); overflow-y: auto; }
        .main-content { margin-left: 240px; flex: 1; min-width: 0; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

        /* ===== Side Navigation ===== */
        .side-nav .brand { padding: 28px 24px 20px; border-bottom: 1px solid rgba(255,255,255,0.06); }
        .side-nav .brand-logo { font-size: 20px; font-weight: 700; color: #fff; letter-spacing: 0.3px; display: flex; align-items: center; gap: 10px; }
        .side-nav .brand-logo i { color: var(--nav-accent); font-size: 24px; }
        .side-nav .brand-sub { font-size: 12px; color: var(--nav-text); margin-top: 4px; padding-left: 34px; opacity: 0.7; }
        .side-nav .nav-list { padding: 16px 16px; flex: 1; display: flex; flex-direction: column; gap: 2px; }
        .side-nav .nav-link { display: flex; align-items: center; gap: 14px; padding: 12px 16px; border-radius: var(--radius-sm); color: var(--nav-text); font-size: 15px; font-weight: 500; transition: var(--transition); position: relative; }
        .side-nav .nav-link i { width: 20px; text-align: center; font-size: 16px; }
        .side-nav .nav-link:hover { background: rgba(255,255,255,0.07); color: var(--nav-hover); }
        .side-nav .nav-link.active { background: rgba(37,99,235,0.18); color: var(--nav-active); }
        .side-nav .nav-link.active::before { content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%); width: 3px; height: 20px; background: var(--primary); border-radius: 0 3px 3px 0; }
        .side-nav .nav-footer { padding: 20px 24px; border-top: 1px solid rgba(255,255,255,0.06); font-size: 12px; color: rgba(255,255,255,0.3); text-align: center; }

        /* ===== Mobile Header ===== */
        .mobile-header { display: none; position: fixed; top: 0; left: 0; right: 0; height: 60px; background: var(--nav-bg); z-index: 100; padding: 0 20px; align-items: center; justify-content: space-between; }
        .mobile-header .brand-logo { font-size: 18px; font-weight: 700; color: #fff; display: flex; align-items: center; gap: 8px; }
        .mobile-header .brand-logo i { color: var(--nav-accent); }
        .mobile-toggle { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 22px; border-radius: var(--radius-sm); background: rgba(255,255,255,0.06); }
        .mobile-toggle:hover { background: rgba(255,255,255,0.12); }
        .mobile-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 90; }
        .mobile-overlay.open { display: block; }
        .mobile-drawer { position: fixed; top: 0; left: -280px; width: 260px; height: 100vh; background: var(--nav-bg); z-index: 110; transition: left 0.3s ease; padding: 20px 16px; overflow-y: auto; }
        .mobile-drawer.open { left: 0; }
        .mobile-drawer .drawer-brand { font-size: 18px; font-weight: 700; color: #fff; padding: 8px 12px 20px; border-bottom: 1px solid rgba(255,255,255,0.06); margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
        .mobile-drawer .drawer-brand i { color: var(--nav-accent); }
        .mobile-drawer .nav-link { display: flex; align-items: center; gap: 14px; padding: 12px 16px; border-radius: var(--radius-sm); color: var(--nav-text); font-size: 15px; font-weight: 500; }
        .mobile-drawer .nav-link i { width: 20px; text-align: center; }
        .mobile-drawer .nav-link:hover { background: rgba(255,255,255,0.07); color: var(--nav-hover); }
        .mobile-drawer .nav-link.active { background: rgba(37,99,235,0.18); color: var(--nav-active); }
        .mobile-drawer .drawer-footer { position: absolute; bottom: 20px; left: 16px; right: 16px; font-size: 12px; color: rgba(255,255,255,0.25); text-align: center; padding-top: 16px; border-top: 1px solid rgba(255,255,255,0.06); }

        /* ===== Hero ===== */
        .hero-section { position: relative; background: linear-gradient(135deg, #0b1120 0%, #1a2744 50%, #0f1d35 100%); padding: 100px 0 80px; overflow: hidden; }
        .hero-section::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 80% 20%, rgba(37,99,235,0.15) 0%, transparent 60%); pointer-events: none; }
        .hero-section .hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(249,115,22,0.15); color: var(--accent-light); padding: 6px 18px; border-radius: 50px; font-size: 13px; font-weight: 600; border: 1px solid rgba(249,115,22,0.2); margin-bottom: 24px; }
        .hero-section .hero-badge i { font-size: 12px; }
        .hero-section h1 { font-size: 48px; font-weight: 800; line-height: 1.15; color: #fff; margin-bottom: 20px; letter-spacing: -0.5px; }
        .hero-section h1 span { background: linear-gradient(135deg, var(--primary-light), var(--accent-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero-section .hero-sub { font-size: 18px; color: rgba(255,255,255,0.65); max-width: 600px; margin-bottom: 36px; line-height: 1.7; }
        .hero-section .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
        .hero-section .hero-stat { display: flex; gap: 40px; margin-top: 56px; padding-top: 36px; border-top: 1px solid rgba(255,255,255,0.08); }
        .hero-section .hero-stat-item { text-align: center; }
        .hero-section .hero-stat-item .num { font-size: 28px; font-weight: 800; color: #fff; }
        .hero-section .hero-stat-item .label { font-size: 13px; color: rgba(255,255,255,0.45); margin-top: 2px; }

        /* ===== Buttons ===== */
        .btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 14px 32px; border-radius: var(--radius-sm); font-weight: 600; font-size: 15px; transition: var(--transition); border: none; line-height: 1.2; }
        .btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 14px rgba(37,99,235,0.35); }
        .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 25px rgba(37,99,235,0.4); }
        .btn-primary:active { transform: translateY(0); }
        .btn-accent { background: var(--accent); color: #fff; box-shadow: 0 4px 14px rgba(249,115,22,0.35); }
        .btn-accent:hover { background: #ea580c; transform: translateY(-2px); box-shadow: 0 8px 25px rgba(249,115,22,0.4); }
        .btn-outline { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,0.25); }
        .btn-outline:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.4); transform: translateY(-2px); }
        .btn-sm { padding: 10px 22px; font-size: 13px; }

        /* ===== Section ===== */
        .section { padding: 80px 0; }
        .section-header { text-align: center; max-width: 700px; margin: 0 auto 52px; }
        .section-header .tag { display: inline-block; background: rgba(37,99,235,0.08); color: var(--primary); font-size: 13px; font-weight: 600; padding: 4px 16px; border-radius: 50px; margin-bottom: 12px; letter-spacing: 0.3px; }
        .section-header h2 { font-size: 34px; font-weight: 800; color: var(--text-body); margin-bottom: 12px; letter-spacing: -0.3px; }
        .section-header p { font-size: 16px; color: var(--text-muted); line-height: 1.7; }
        .section-alt { background: #ffffff; }
        .section-dark { background: var(--nav-bg); }
        .section-dark .section-header h2 { color: #fff; }
        .section-dark .section-header p { color: rgba(255,255,255,0.6); }
        .section-dark .section-header .tag { background: rgba(249,115,22,0.15); color: var(--accent-light); }

        /* ===== Cards ===== */
        .card { background: var(--bg-card); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); transition: var(--transition); overflow: hidden; border: 1px solid var(--border-light); }
        .card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
        .card-body { padding: 28px; }
        .card-icon { width: 52px; height: 52px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 22px; margin-bottom: 16px; color: #fff; }
        .card-icon.blue { background: linear-gradient(135deg, var(--primary), #1e40af); }
        .card-icon.orange { background: linear-gradient(135deg, var(--accent), #dc2626); }
        .card-icon.teal { background: linear-gradient(135deg, #0d9488, #0f766e); }
        .card-icon.purple { background: linear-gradient(135deg, #8b5cf6, #6d28d9); }
        .card h3 { font-size: 19px; font-weight: 700; color: var(--text-body); margin-bottom: 8px; }
        .card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }

        /* ===== Feature Grid ===== */
        .feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 28px; }

        /* ===== Category Cards ===== */
        .category-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px; }
        .category-card { position: relative; background: var(--bg-card); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); padding: 32px 28px; transition: var(--transition); border: 1px solid var(--border-light); overflow: hidden; }
        .category-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
        .category-card .cat-icon { font-size: 36px; margin-bottom: 16px; color: var(--primary); }
        .category-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
        .category-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 16px; line-height: 1.7; }
        .category-card .cat-link { font-size: 14px; font-weight: 600; color: var(--primary); display: inline-flex; align-items: center; gap: 6px; }
        .category-card .cat-link:hover { gap: 10px; }
        .category-card .cat-badge { position: absolute; top: 16px; right: 16px; background: rgba(37,99,235,0.08); color: var(--primary); font-size: 11px; font-weight: 600; padding: 2px 12px; border-radius: 50px; }

        /* ===== Content List ===== */
        .content-list { display: flex; flex-direction: column; gap: 16px; }
        .content-item { display: flex; align-items: flex-start; gap: 20px; background: var(--bg-card); border-radius: var(--radius-sm); padding: 20px 24px; border: 1px solid var(--border-light); transition: var(--transition); }
        .content-item:hover { box-shadow: var(--shadow-sm); border-color: var(--primary); }
        .content-item .item-index { width: 32px; height: 32px; border-radius: 50%; background: rgba(37,99,235,0.08); color: var(--primary); font-size: 14px; font-weight: 700; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 2px; }
        .content-item .item-body { flex: 1; min-width: 0; }
        .content-item .item-body h4 { font-size: 16px; font-weight: 600; color: var(--text-body); margin-bottom: 4px; transition: var(--transition); }
        .content-item:hover .item-body h4 { color: var(--primary); }
        .content-item .item-body p { font-size: 13px; color: var(--text-muted); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .content-item .item-meta { display: flex; align-items: center; gap: 16px; margin-top: 8px; font-size: 12px; color: var(--text-muted); }
        .content-item .item-meta .cat-tag { background: rgba(249,115,22,0.1); color: var(--accent); padding: 1px 10px; border-radius: 50px; font-size: 11px; font-weight: 500; }
        .content-item .item-thumb { width: 72px; height: 72px; border-radius: var(--radius-sm); background: var(--border-light); flex-shrink: 0; overflow: hidden; display: flex; align-items: center; justify-content: center; color: var(--text-muted); font-size: 28px; }
        .content-empty { text-align: center; padding: 48px 24px; color: var(--text-muted); font-size: 15px; background: var(--bg-card); border-radius: var(--radius-md); border: 1px dashed var(--border-light); }

        /* ===== Steps ===== */
        .steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; counter-reset: step; }
        .step-card { text-align: center; padding: 32px 20px; background: rgba(255,255,255,0.04); border-radius: var(--radius-md); border: 1px solid rgba(255,255,255,0.06); transition: var(--transition); position: relative; }
        .step-card:hover { background: rgba(255,255,255,0.07); transform: translateY(-3px); }
        .step-card .step-num { width: 44px; height: 44px; border-radius: 50%; background: rgba(37,99,235,0.2); color: var(--primary-light); font-size: 18px; font-weight: 800; display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; }
        .step-card .step-num::before { counter-increment: step; content: counter(step); }
        .step-card h4 { font-size: 17px; font-weight: 700; color: #fff; margin-bottom: 6px; }
        .step-card p { font-size: 13px; color: rgba(255,255,255,0.55); line-height: 1.6; }

        /* ===== Stats ===== */
        .stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 24px; }
        .stat-card { text-align: center; padding: 32px 16px; background: var(--bg-card); border-radius: var(--radius-md); border: 1px solid var(--border-light); transition: var(--transition); }
        .stat-card:hover { box-shadow: var(--shadow-sm); transform: translateY(-2px); }
        .stat-card .stat-num { font-size: 36px; font-weight: 800; color: var(--primary); line-height: 1.2; }
        .stat-card .stat-num span { font-size: 18px; font-weight: 600; }
        .stat-card p { font-size: 14px; color: var(--text-muted); margin-top: 4px; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item { background: var(--bg-card); border-radius: var(--radius-sm); border: 1px solid var(--border-light); overflow: hidden; transition: var(--transition); }
        .faq-item:hover { border-color: var(--primary); }
        .faq-item summary { padding: 20px 24px; font-size: 16px; font-weight: 600; color: var(--text-body); cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 16px; list-style: none; }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary .faq-icon { font-size: 14px; color: var(--primary); transition: var(--transition); flex-shrink: 0; }
        .faq-item[open] summary .faq-icon { transform: rotate(45deg); }
        .faq-item .faq-answer { padding: 0 24px 20px; font-size: 14px; color: var(--text-muted); line-height: 1.7; }

        /* ===== CTA ===== */
        .cta-section { background: linear-gradient(135deg, #0b1120 0%, #1a2744 100%); padding: 72px 0; text-align: center; }
        .cta-section h2 { font-size: 34px; font-weight: 800; color: #fff; margin-bottom: 12px; }
        .cta-section p { font-size: 16px; color: rgba(255,255,255,0.6); max-width: 560px; margin: 0 auto 32px; }
        .cta-section .cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

        /* ===== Footer ===== */
        .footer { background: #060b16; padding: 48px 0 32px; border-top: 1px solid rgba(255,255,255,0.04); }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-brand .brand-logo { font-size: 18px; font-weight: 700; color: #fff; display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
        .footer-brand .brand-logo i { color: var(--nav-accent); }
        .footer-brand p { font-size: 13px; color: rgba(255,255,255,0.35); max-width: 320px; line-height: 1.7; }
        .footer h4 { font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 16px; }
        .footer ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
        .footer ul li a { font-size: 13px; color: rgba(255,255,255,0.4); transition: var(--transition); }
        .footer ul li a:hover { color: var(--primary-light); padding-left: 4px; }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.04); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 12px; color: rgba(255,255,255,0.25); }

        /* ===== Badge / Tag ===== */
        .badge { display: inline-flex; align-items: center; gap: 4px; padding: 2px 12px; border-radius: 50px; font-size: 12px; font-weight: 500; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .hero-section h1 { font-size: 38px; }
            .section-header h2 { font-size: 28px; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            .side-nav { display: none; }
            .mobile-header { display: flex; }
            .main-content { margin-left: 0; padding-top: 60px; }
            .hero-section { padding: 72px 0 56px; }
            .hero-section h1 { font-size: 30px; }
            .hero-section .hero-sub { font-size: 16px; }
            .hero-section .hero-stat { gap: 24px; flex-wrap: wrap; }
            .hero-section .hero-stat-item .num { font-size: 22px; }
            .section { padding: 56px 0; }
            .section-header { margin-bottom: 36px; }
            .section-header h2 { font-size: 24px; }
            .feature-grid { grid-template-columns: 1fr; }
            .category-grid { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr 1fr; }
            .stats-grid { grid-template-columns: 1fr 1fr; }
            .content-item { flex-direction: column; padding: 16px 20px; }
            .content-item .item-thumb { width: 100%; height: 120px; }
            .cta-section h2 { font-size: 26px; }
            .cta-section p { font-size: 14px; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .container { padding: 0 16px; }
        }

        @media (max-width: 520px) {
            .hero-section h1 { font-size: 24px; }
            .hero-section .hero-actions { flex-direction: column; }
            .hero-section .hero-actions .btn { width: 100%; justify-content: center; }
            .steps-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: 1fr 1fr; }
            .section-header h2 { font-size: 21px; }
            .card-body { padding: 20px; }
        }

        /* ===== Utility ===== */
        .fade-in { animation: fadeIn 0.6s ease forwards; }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
        .gap-2 { gap: 8px; }
        .gap-3 { gap: 12px; }
        .gap-4 { gap: 16px; }
        .gap-6 { gap: 24px; }
        .gap-8 { gap: 32px; }
        .mt-2 { margin-top: 8px; }
        .mt-4 { margin-top: 16px; }
        .mt-6 { margin-top: 24px; }
        .mt-8 { margin-top: 32px; }
        .mb-2 { margin-bottom: 8px; }
        .mb-4 { margin-bottom: 16px; }
        .mb-6 { margin-bottom: 24px; }
        .text-center { text-align: center; }
        .flex-wrap { flex-wrap: wrap; }
        .items-center { align-items: center; }
        .justify-center { justify-content: center; }
        .flex { display: flex; }
        .inline-flex { display: inline-flex; }
        .hidden { display: none; }
        .block { display: block; }
        .relative { position: relative; }
        .overflow-hidden { overflow: hidden; }
        .w-full { width: 100%; }

/* roulang page: category1 */
:root {
            --primary: #c02626;
            --primary-hover: #991b1b;
            --accent: #f59e0b;
            --dark: #0f172a;
            --sidebar-width: 260px;
            --header-height: 0px;
            --radius: 12px;
            --radius-sm: 8px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
            background: #f8fafc;
            color: #1e293b;
            line-height: 1.7;
            min-height: 100vh;
            display: flex;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input,
        textarea {
            font-family: inherit;
            outline: none;
            border: none;
        }

        /* ===== 左侧导航 ===== */
        .side-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
            color: #fff;
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: var(--transition);
            border-right: 1px solid rgba(255, 255, 255, 0.06);
            overflow-y: auto;
        }

        .side-nav .brand {
            padding: 28px 24px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .side-nav .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 22px;
            font-weight: 700;
            letter-spacing: 0.5px;
        }

        .side-nav .brand-logo i {
            color: var(--accent);
            font-size: 28px;
        }

        .side-nav .brand-logo span {
            background: linear-gradient(135deg, #fff 60%, #94a3b8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .side-nav .brand-sub {
            font-size: 13px;
            color: #94a3b8;
            margin-top: 6px;
            padding-left: 40px;
            letter-spacing: 1px;
        }

        .side-nav .nav-list {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .side-nav .nav-link {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 14px 18px;
            border-radius: var(--radius-sm);
            color: #cbd5e1;
            font-size: 15px;
            font-weight: 500;
            transition: var(--transition);
            position: relative;
        }

        .side-nav .nav-link i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: #64748b;
            transition: var(--transition);
        }

        .side-nav .nav-link:hover {
            background: rgba(255, 255, 255, 0.06);
            color: #fff;
        }

        .side-nav .nav-link:hover i {
            color: var(--accent);
        }

        .side-nav .nav-link.active {
            background: rgba(192, 38, 38, 0.25);
            color: #fff;
            box-shadow: inset 3px 0 0 var(--primary);
        }

        .side-nav .nav-link.active i {
            color: var(--accent);
        }

        .side-nav .nav-footer {
            padding: 20px 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 12px;
            color: #64748b;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .side-nav .nav-footer i {
            color: var(--accent);
            font-size: 14px;
        }

        /* ===== 主内容区 ===== */
        .main-wrapper {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .main-content {
            flex: 1;
            padding: 40px 48px 60px;
            max-width: 1200px;
            width: 100%;
        }

        /* ===== 移动端顶部导航 ===== */
        .mobile-topbar {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 64px;
            background: #0f172a;
            color: #fff;
            z-index: 999;
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.3);
        }

        .mobile-topbar .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            font-weight: 700;
        }

        .mobile-topbar .brand-logo i {
            color: var(--accent);
            font-size: 22px;
        }

        .mobile-topbar .brand-logo span {
            background: linear-gradient(135deg, #fff 60%, #94a3b8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .mobile-menu-btn {
            background: none;
            color: #fff;
            font-size: 24px;
            cursor: pointer;
            padding: 8px;
            border-radius: 6px;
            transition: var(--transition);
        }

        .mobile-menu-btn:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        .mobile-menu-overlay {
            display: none;
            position: fixed;
            top: 64px;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(15, 23, 42, 0.98);
            z-index: 998;
            padding: 24px 20px;
            overflow-y: auto;
        }

        .mobile-menu-overlay.open {
            display: block;
        }

        .mobile-menu-overlay .nav-link {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 16px 18px;
            border-radius: var(--radius-sm);
            color: #cbd5e1;
            font-size: 16px;
            font-weight: 500;
            transition: var(--transition);
        }

        .mobile-menu-overlay .nav-link i {
            width: 20px;
            color: #64748b;
        }

        .mobile-menu-overlay .nav-link.active {
            background: rgba(192, 38, 38, 0.25);
            color: #fff;
        }

        .mobile-menu-overlay .nav-link.active i {
            color: var(--accent);
        }

        .mobile-menu-overlay .nav-footer {
            margin-top: 32px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            color: #64748b;
            font-size: 13px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .mobile-menu-overlay .nav-footer i {
            color: var(--accent);
        }

        /* ===== 通用组件 ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            width: 100%;
        }

        .page-hero {
            padding: 32px 0 24px;
            margin-bottom: 40px;
            border-bottom: 2px solid rgba(192, 38, 38, 0.15);
        }

        .page-hero h1 {
            font-size: 32px;
            font-weight: 800;
            color: #0f172a;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 14px;
        }

        .page-hero h1 i {
            color: var(--primary);
            font-size: 30px;
        }

        .page-hero p {
            font-size: 16px;
            color: #64748b;
            margin-top: 10px;
            max-width: 680px;
            line-height: 1.8;
        }

        .section-block {
            margin-bottom: 56px;
        }

        .section-title {
            font-size: 24px;
            font-weight: 700;
            color: #0f172a;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .section-title i {
            color: var(--primary);
        }

        .section-subtitle {
            font-size: 15px;
            color: #64748b;
            margin-bottom: 28px;
        }

        .divider {
            height: 4px;
            width: 60px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 4px;
            margin-bottom: 24px;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            background: rgba(192, 38, 38, 0.1);
            color: var(--primary);
        }

        .badge-accent {
            background: rgba(245, 158, 11, 0.15);
            color: #92400e;
        }

        .badge-dark {
            background: rgba(15, 23, 42, 0.08);
            color: #334155;
        }

        /* ===== 卡片 ===== */
        .card {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid #e2e8f0;
            transition: var(--transition);
            overflow: hidden;
        }

        .card:hover {
            box-shadow: var(--shadow);
            transform: translateY(-2px);
            border-color: #cbd5e1;
        }

        .card-body {
            padding: 24px;
        }

        .card-image {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: #e2e8f0;
        }

        /* ===== 指南步骤 ===== */
        .step-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .step-item {
            display: flex;
            gap: 18px;
            align-items: flex-start;
            background: #fff;
            padding: 20px 24px;
            border-radius: var(--radius);
            border: 1px solid #e2e8f0;
            transition: var(--transition);
        }

        .step-item:hover {
            border-color: #cbd5e1;
            box-shadow: var(--shadow-sm);
        }

        .step-num {
            flex-shrink: 0;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), #991b1b);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
        }

        .step-content h4 {
            font-size: 17px;
            font-weight: 600;
            color: #0f172a;
            margin-bottom: 4px;
        }

        .step-content p {
            font-size: 14px;
            color: #64748b;
            line-height: 1.7;
        }

        /* ===== 文章/指南网格 ===== */
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 24px;
        }

        .guide-card {
            background: #fff;
            border-radius: var(--radius);
            border: 1px solid #e2e8f0;
            overflow: hidden;
            transition: var(--transition);
        }

        .guide-card:hover {
            box-shadow: var(--shadow);
            transform: translateY(-3px);
            border-color: #cbd5e1;
        }

        .guide-card .card-top {
            height: 6px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
        }

        .guide-card .card-body {
            padding: 24px;
        }

        .guide-card .card-body .tag-group {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 12px;
        }

        .guide-card .card-body .tag {
            font-size: 12px;
            padding: 2px 10px;
            border-radius: 12px;
            background: rgba(192, 38, 38, 0.08);
            color: var(--primary);
            font-weight: 500;
        }

        .guide-card .card-body h3 {
            font-size: 18px;
            font-weight: 600;
            color: #0f172a;
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .guide-card .card-body p {
            font-size: 14px;
            color: #64748b;
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .guide-card .card-body .card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 14px;
            border-top: 1px solid #f1f5f9;
        }

        .guide-card .card-body .card-footer .meta {
            font-size: 13px;
            color: #94a3b8;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .guide-card .card-body .card-footer .read-more {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 6px;
            transition: var(--transition);
        }

        .guide-card .card-body .card-footer .read-more:hover {
            gap: 10px;
            color: #991b1b;
        }

        /* ===== FAQ ===== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: #fff;
            border-radius: var(--radius-sm);
            border: 1px solid #e2e8f0;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: #cbd5e1;
        }

        .faq-question {
            padding: 18px 22px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 600;
            font-size: 16px;
            color: #0f172a;
            transition: var(--transition);
            background: none;
            width: 100%;
            text-align: left;
            gap: 12px;
        }

        .faq-question:hover {
            color: var(--primary);
        }

        .faq-question i {
            transition: var(--transition);
            color: #94a3b8;
            flex-shrink: 0;
        }

        .faq-question.open i {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 22px;
            color: #475569;
            font-size: 15px;
            line-height: 1.8;
        }

        .faq-answer.open {
            max-height: 300px;
            padding: 0 22px 20px;
        }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            border-radius: var(--radius);
            padding: 48px 40px;
            text-align: center;
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.06);
        }

        .cta-block h2 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .cta-block p {
            color: #94a3b8;
            max-width: 560px;
            margin: 0 auto 28px;
            font-size: 16px;
        }

        .cta-block .btn-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 16px;
            transition: var(--transition);
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
        }

        .btn-primary:hover {
            background: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(192, 38, 38, 0.35);
        }

        .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.2);
        }

        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }

        .btn-accent {
            background: var(--accent);
            color: #0f172a;
        }

        .btn-accent:hover {
            background: #d97706;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.35);
        }

        /* ===== 页脚 ===== */
        .footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 48px 0 0;
            margin-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
        }

        .footer .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .footer .brand-logo i {
            color: var(--accent);
        }

        .footer p {
            font-size: 14px;
            line-height: 1.8;
            color: #94a3b8;
        }

        .footer h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer ul li a {
            color: #94a3b8;
            font-size: 14px;
            transition: var(--transition);
        }

        .footer ul li a:hover {
            color: var(--accent);
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: #64748b;
            flex-wrap: wrap;
            gap: 12px;
        }

        .footer-bottom i {
            color: var(--accent);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .main-content {
                padding: 32px 28px 48px;
            }

            .footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            .side-nav {
                display: none;
            }

            .mobile-topbar {
                display: flex;
            }

            .main-wrapper {
                margin-left: 0;
                padding-top: 64px;
            }

            .main-content {
                padding: 24px 20px 40px;
            }

            .page-hero h1 {
                font-size: 26px;
                flex-wrap: wrap;
            }

            .page-hero p {
                font-size: 15px;
            }

            .section-title {
                font-size: 20px;
            }

            .guide-grid {
                grid-template-columns: 1fr;
            }

            .footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

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

            .cta-block {
                padding: 32px 24px;
            }

            .cta-block h2 {
                font-size: 22px;
            }

            .cta-block .btn-group {
                flex-direction: column;
                align-items: center;
            }

            .step-item {
                padding: 16px 18px;
            }

            .step-num {
                width: 34px;
                height: 34px;
                font-size: 15px;
            }
        }

        @media (max-width: 520px) {
            .main-content {
                padding: 16px 14px 32px;
            }

            .page-hero {
                padding: 20px 0 16px;
                margin-bottom: 28px;
            }

            .page-hero h1 {
                font-size: 22px;
            }

            .guide-card .card-body {
                padding: 18px;
            }

            .faq-question {
                font-size: 14px;
                padding: 14px 16px;
            }

            .faq-answer {
                font-size: 14px;
            }

            .btn {
                padding: 12px 24px;
                font-size: 14px;
                width: 100%;
                justify-content: center;
            }
        }

        /* ===== 滚动条美化 ===== */
        .side-nav::-webkit-scrollbar {
            width: 4px;
        }

        .side-nav::-webkit-scrollbar-track {
            background: transparent;
        }

        .side-nav::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 4px;
        }

        .side-nav::-webkit-scrollbar-thumb:hover {
            background: rgba(255, 255, 255, 0.25);
        }

/* roulang page: article */
:root {
            --primary: #0a1628;
            --primary-light: #132242;
            --primary-dark: #060e1a;
            --accent: #e74c3c;
            --accent-hover: #c0392b;
            --accent-glow: rgba(231, 76, 60, 0.15);
            --gold: #f0b429;
            --gold-light: #fcd34d;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --bg-dark: #0a1628;
            --bg-dark-card: #0f1d36;
            --text-primary: #1e293b;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-light: #f1f5f9;
            --border: #e2e8f0;
            --border-dark: #1e3a5f;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --shadow-glow: 0 0 20px rgba(231,76,60,0.08);
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
            --nav-width: 240px;
            --header-height: 60px;
        }
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            overflow-x: hidden;
        }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        button, input, textarea { font-family: inherit; font-size: inherit; outline: none; }
        ul, ol { list-style: none; }
        .container { width: 100%; max-width: 960px; margin: 0 auto; padding: 0 24px; }
        .container-wide { max-width: 1200px; }

        /* Layout */
        .app-layout { display: flex; min-height: 100vh; }
        .side-nav {
            width: var(--nav-width);
            background: var(--primary);
            display: flex; flex-direction: column;
            position: fixed; top: 0; left: 0; bottom: 0;
            z-index: 100; overflow-y: auto;
            border-right: 1px solid rgba(255,255,255,0.04);
            transition: transform var(--transition);
        }
        .side-nav::-webkit-scrollbar { width: 4px; }
        .side-nav::-webkit-scrollbar-track { background: transparent; }
        .side-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 4px; }
        .main-content {
            flex: 1; margin-left: var(--nav-width);
            min-height: 100vh; display: flex; flex-direction: column;
        }
        .content-wrap { flex: 1; }

        /* Brand */
        .brand { padding: 28px 20px 16px; border-bottom: 1px solid rgba(255,255,255,0.06); }
        .brand-logo { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 700; font-size: 18px; }
        .brand-logo i { font-size: 22px; color: var(--accent); }
        .brand-sub { font-size: 12px; color: rgba(255,255,255,0.45); margin-top: 4px; padding-left: 32px; letter-spacing: 0.3px; }

        /* Nav Links */
        .nav-list { padding: 12px 12px; flex: 1; }
        .nav-link {
            display: flex; align-items: center; gap: 12px;
            padding: 10px 14px; margin-bottom: 2px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.6);
            font-size: 14px; font-weight: 500;
            transition: var(--transition);
        }
        .nav-link i { width: 18px; text-align: center; font-size: 15px; }
        .nav-link:hover { background: rgba(255,255,255,0.06); color: rgba(255,255,255,0.9); }
        .nav-link.active { background: var(--accent-glow); color: var(--accent); }
        .nav-footer {
            padding: 16px 20px;
            font-size: 11px; color: rgba(255,255,255,0.3);
            border-top: 1px solid rgba(255,255,255,0.06);
            display: flex; align-items: center; gap: 8px;
        }
        .nav-footer i { font-size: 13px; color: var(--gold); }

        /* Mobile Header */
        .mobile-header {
            display: none;
            position: sticky; top: 0; z-index: 90;
            background: var(--primary); padding: 0 16px;
            height: var(--header-height);
            align-items: center; justify-content: space-between;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .mobile-header .brand-logo { font-size: 16px; }
        .mobile-header .brand-sub { display: none; }
        .menu-toggle {
            background: none; border: none; color: #fff;
            font-size: 22px; padding: 8px; cursor: pointer;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .menu-toggle:hover { background: rgba(255,255,255,0.08); }
        .nav-overlay {
            display: none;
            position: fixed; top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(0,0,0,0.5); z-index: 99;
            opacity: 0; transition: opacity var(--transition);
        }
        .nav-overlay.open { opacity: 1; }

        /* Article */
        .article-hero {
            background: var(--primary);
            padding: 48px 0 32px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .article-hero .container { max-width: 960px; }
        .article-breadcrumb {
            display: flex; align-items: center; gap: 8px;
            font-size: 13px; color: rgba(255,255,255,0.45);
            margin-bottom: 20px; flex-wrap: wrap;
        }
        .article-breadcrumb a { color: rgba(255,255,255,0.55); }
        .article-breadcrumb a:hover { color: var(--accent); }
        .article-breadcrumb .sep { color: rgba(255,255,255,0.2); }
        .article-breadcrumb .current { color: rgba(255,255,255,0.7); }

        .article-title {
            font-size: 32px; font-weight: 800; color: #fff;
            line-height: 1.3; margin-bottom: 16px;
        }
        .article-meta {
            display: flex; align-items: center; gap: 20px;
            flex-wrap: wrap; font-size: 13px; color: rgba(255,255,255,0.5);
        }
        .article-meta .badge {
            display: inline-block;
            padding: 2px 12px; border-radius: 20px;
            background: var(--accent-glow); color: var(--accent);
            font-size: 12px; font-weight: 600;
        }
        .article-meta i { margin-right: 4px; }

        .article-body {
            padding: 40px 0 48px;
            background: #fff;
        }
        .article-body .container { max-width: 960px; }
        .article-content {
            font-size: 16px; line-height: 1.9;
            color: var(--text-primary);
        }
        .article-content h2 { font-size: 24px; font-weight: 700; margin: 36px 0 16px; color: var(--primary); }
        .article-content h3 { font-size: 20px; font-weight: 600; margin: 28px 0 12px; color: var(--primary); }
        .article-content p { margin-bottom: 18px; }
        .article-content ul, .article-content ol { margin: 16px 0 18px; padding-left: 24px; }
        .article-content ul li { list-style: disc; margin-bottom: 6px; }
        .article-content ol li { list-style: decimal; margin-bottom: 6px; }
        .article-content a { color: var(--accent); border-bottom: 1px solid transparent; }
        .article-content a:hover { border-bottom-color: var(--accent); }
        .article-content blockquote {
            border-left: 4px solid var(--accent);
            background: #fef2f2;
            padding: 16px 20px; margin: 20px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
        }
        .article-content img { margin: 24px 0; border-radius: var(--radius); box-shadow: var(--shadow-md); }
        .article-content pre {
            background: var(--primary); color: #e2e8f0;
            padding: 20px 24px; border-radius: var(--radius);
            overflow-x: auto; font-size: 14px; line-height: 1.6;
            margin: 20px 0;
        }
        .article-content code { font-family: 'JetBrains Mono', 'Fira Code', monospace; font-size: 14px; }
        .article-content p code { background: #f1f5f9; padding: 2px 8px; border-radius: 4px; color: var(--accent); }

        .article-tags {
            margin-top: 40px; padding-top: 28px;
            border-top: 1px solid var(--border);
            display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
        }
        .article-tags .label { font-size: 13px; color: var(--text-muted); font-weight: 500; }
        .article-tags .tag {
            display: inline-block;
            padding: 4px 14px; border-radius: 20px;
            background: #f1f5f9; color: var(--text-secondary);
            font-size: 12px; font-weight: 500;
            transition: var(--transition);
        }
        .article-tags .tag:hover { background: var(--accent-glow); color: var(--accent); }

        .article-nav {
            margin-top: 36px; padding-top: 24px;
            border-top: 1px solid var(--border);
            display: flex; justify-content: space-between; gap: 16px;
            flex-wrap: wrap;
        }
        .article-nav a {
            display: flex; align-items: center; gap: 8px;
            font-size: 14px; color: var(--text-secondary); font-weight: 500;
            padding: 8px 16px; border-radius: var(--radius-sm);
            background: #f8fafc; border: 1px solid var(--border);
            transition: var(--transition);
        }
        .article-nav a:hover { background: var(--accent-glow); border-color: var(--accent); color: var(--accent); }

        /* Error */
        .error-section {
            padding: 80px 0; text-align: center;
            background: #fff;
        }
        .error-section .error-icon { font-size: 56px; color: var(--text-muted); margin-bottom: 16px; }
        .error-section h2 { font-size: 24px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
        .error-section p { color: var(--text-secondary); margin-bottom: 24px; }

        /* Related */
        .related-section {
            padding: 48px 0;
            background: var(--bg-body);
            border-top: 1px solid var(--border);
        }
        .related-section .container { max-width: 960px; }
        .related-title {
            font-size: 20px; font-weight: 700; color: var(--primary);
            margin-bottom: 24px; display: flex; align-items: center; gap: 10px;
        }
        .related-title i { color: var(--accent); }
        .related-grid { display: grid; gap: 16px; }
        .related-card {
            display: flex; align-items: center; gap: 16px;
            padding: 16px 20px; background: var(--bg-card);
            border-radius: var(--radius); border: 1px solid var(--border);
            transition: var(--transition);
        }
        .related-card:hover { border-color: var(--accent); box-shadow: var(--shadow-glow); transform: translateY(-2px); }
        .related-card .num {
            font-size: 20px; font-weight: 800; color: var(--text-muted);
            min-width: 32px; font-feature-settings: "tnum";
        }
        .related-card .info { flex: 1; min-width: 0; }
        .related-card .info h4 { font-size: 15px; font-weight: 600; color: var(--text-primary); margin-bottom: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
        .related-card .info .meta { font-size: 12px; color: var(--text-muted); }
        .related-card .info .meta .cat { color: var(--accent); }
        .related-card .arrow { color: var(--text-muted); font-size: 14px; transition: var(--transition); }
        .related-card:hover .arrow { color: var(--accent); transform: translateX(4px); }

        /* CTA */
        .cta-section {
            padding: 48px 0;
            background: var(--primary);
            text-align: center;
        }
        .cta-section .container { max-width: 960px; }
        .cta-section h3 { font-size: 24px; font-weight: 700; color: #fff; margin-bottom: 8px; }
        .cta-section p { color: rgba(255,255,255,0.6); font-size: 15px; margin-bottom: 24px; }
        .cta-btn {
            display: inline-flex; align-items: center; gap: 10px;
            padding: 14px 36px; border-radius: var(--radius);
            background: var(--accent); color: #fff;
            font-size: 16px; font-weight: 600;
            transition: var(--transition); border: none; cursor: pointer;
        }
        .cta-btn:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(231,76,60,0.25); }

        /* Footer */
        .footer {
            background: var(--primary-dark);
            padding: 40px 0 0;
            border-top: 1px solid rgba(255,255,255,0.04);
        }
        .footer .container { max-width: 1200px; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; padding-bottom: 28px; border-bottom: 1px solid rgba(255,255,255,0.06); }
        .footer-brand .brand-logo { color: #fff; margin-bottom: 8px; }
        .footer-brand p { font-size: 13px; color: rgba(255,255,255,0.45); line-height: 1.7; max-width: 360px; }
        .footer h4 { font-size: 14px; font-weight: 600; color: rgba(255,255,255,0.8); margin-bottom: 12px; }
        .footer ul li { margin-bottom: 8px; }
        .footer ul li a { font-size: 13px; color: rgba(255,255,255,0.4); transition: var(--transition); }
        .footer ul li a:hover { color: var(--accent); }
        .footer-bottom {
            padding: 16px 0;
            display: flex; align-items: center; justify-content: space-between;
            font-size: 12px; color: rgba(255,255,255,0.3); flex-wrap: wrap; gap: 8px;
        }
        .footer-bottom i { color: var(--gold); margin-right: 4px; }

        /* Empty state */
        .empty-state { text-align: center; padding: 40px 0; color: var(--text-muted); }
        .empty-state i { font-size: 40px; margin-bottom: 12px; display: block; }
        .empty-state p { font-size: 15px; }

        /* Responsive */
        @media (max-width: 1024px) {
            .article-title { font-size: 28px; }
        }
        @media (max-width: 768px) {
            .side-nav { transform: translateX(-100%); }
            .side-nav.open { transform: translateX(0); }
            .nav-overlay { display: block; pointer-events: none; }
            .nav-overlay.open { pointer-events: auto; }
            .mobile-header { display: flex; }
            .main-content { margin-left: 0; }
            .article-hero { padding: 32px 0 24px; }
            .article-title { font-size: 24px; }
            .article-body { padding: 28px 0 36px; }
            .article-content { font-size: 15px; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .related-grid { grid-template-columns: 1fr; }
            .article-nav { flex-direction: column; }
            .article-nav a { justify-content: center; }
            .brand { padding: 20px 16px 12px; }
            .brand-sub { padding-left: 28px; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .article-title { font-size: 20px; }
            .article-content { font-size: 14px; }
            .article-meta { gap: 12px; font-size: 12px; }
            .article-hero { padding: 24px 0 16px; }
            .article-body { padding: 20px 0 28px; }
            .cta-section h3 { font-size: 20px; }
            .cta-btn { width: 100%; justify-content: center; }
            .related-card { padding: 12px 16px; }
            .related-card .info h4 { font-size: 14px; }
            .article-breadcrumb { font-size: 12px; }
            .error-section { padding: 48px 0; }
            .error-section .error-icon { font-size: 40px; }
        }

/* roulang page: category2 */
:root {
            --primary: #dc2626;
            --primary-hover: #b91c1c;
            --accent: #1e293b;
            --surface: #fafafa;
            --text: #1e293b;
            --text-weak: #64748b;
            --border: #e2e8f0;
            --radius: 0.75rem;
            --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-hover: 0 10px 25px rgba(0, 0, 0, 0.08), 0 4px 10px rgba(0, 0, 0, 0.05);
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            background: var(--surface);
            color: var(--text);
            line-height: 1.6;
            display: flex;
            min-height: 100vh;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s, opacity 0.2s;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            background: none;
            outline: none;
        }
        ::selection {
            background: rgba(220, 38, 38, 0.15);
            color: #991b1b;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== 左侧导航 ===== */
        .side-nav {
            width: 240px;
            min-height: 100vh;
            background: #fff;
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            position: fixed;
            top: 0;
            left: 0;
            z-index: 100;
            padding: 28px 0 20px;
            transition: transform 0.3s ease;
            box-shadow: 2px 0 12px rgba(0, 0, 0, 0.04);
        }
        .side-nav .brand {
            padding: 0 20px 24px;
            border-bottom: 1px solid var(--border);
            margin-bottom: 16px;
        }
        .side-nav .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary);
        }
        .side-nav .brand-logo i {
            font-size: 1.5rem;
        }
        .side-nav .brand-sub {
            font-size: 0.8rem;
            color: var(--text-weak);
            margin-top: 4px;
            padding-left: 36px;
            letter-spacing: 0.5px;
        }
        .side-nav .nav-list {
            display: flex;
            flex-direction: column;
            gap: 2px;
            padding: 0 12px;
            flex: 1;
        }
        .side-nav .nav-link {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: 0.5rem;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text);
            transition: background 0.2s, color 0.2s;
        }
        .side-nav .nav-link i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            color: var(--text-weak);
            transition: color 0.2s;
        }
        .side-nav .nav-link:hover {
            background: #f1f5f9;
            color: var(--primary);
        }
        .side-nav .nav-link:hover i {
            color: var(--primary);
        }
        .side-nav .nav-link.active {
            background: #fef2f2;
            color: var(--primary);
            font-weight: 600;
        }
        .side-nav .nav-link.active i {
            color: var(--primary);
        }
        .side-nav .nav-footer {
            padding: 16px 20px 0;
            margin-top: 12px;
            border-top: 1px solid var(--border);
            font-size: 0.8rem;
            color: var(--text-weak);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .side-nav .nav-footer i {
            color: var(--primary);
        }

        /* ===== 主内容区 ===== */
        .main-content {
            margin-left: 240px;
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .main-content .page-header {
            padding: 40px 0 32px;
            background: linear-gradient(135deg, #fef2f2 0%, #fff 60%);
            border-bottom: 1px solid var(--border);
        }
        .main-content .page-header h1 {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .main-content .page-header p {
            font-size: 1.1rem;
            color: var(--text-weak);
            margin-top: 12px;
            max-width: 680px;
        }
        .main-content .page-body {
            flex: 1;
            padding: 40px 0 60px;
        }

        /* ===== 板块通用 ===== */
        .section-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 8px;
        }
        .section-subtitle {
            font-size: 0.95rem;
            color: var(--text-weak);
            margin-bottom: 28px;
        }
        .card-base {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: box-shadow 0.25s, transform 0.25s;
        }
        .card-base:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }
        .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 999px;
            font-size: 0.8rem;
            font-weight: 500;
            background: #fef2f2;
            color: var(--primary);
            border: 1px solid #fecaca;
        }
        .tag-accent {
            background: #f1f5f9;
            color: var(--accent);
            border-color: #e2e8f0;
        }
        .badge-dot {
            display: inline-block;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--primary);
            margin-right: 6px;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: var(--primary);
            color: #fff;
            border-radius: 0.5rem;
            font-weight: 600;
            font-size: 0.95rem;
            transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
            box-shadow: 0 4px 12px rgba(220, 38, 38, 0.25);
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(220, 38, 38, 0.35);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(220, 38, 38, 0.2);
        }
        .btn-primary:focus-visible {
            outline: 3px solid rgba(220, 38, 38, 0.4);
            outline-offset: 2px;
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            background: transparent;
            color: var(--accent);
            border: 2px solid var(--border);
            border-radius: 0.5rem;
            font-weight: 600;
            font-size: 0.9rem;
            transition: border-color 0.2s, color 0.2s, background 0.2s;
            cursor: pointer;
        }
        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: #fef2f2;
        }
        .btn-outline:focus-visible {
            outline: 3px solid rgba(220, 38, 38, 0.3);
            outline-offset: 2px;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: #fff;
            border-top: 1px solid var(--border);
            padding: 48px 0 32px;
            margin-top: auto;
        }
        .footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer .footer-brand .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .footer .footer-brand .brand-logo i {
            font-size: 1.3rem;
        }
        .footer .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-weak);
            line-height: 1.7;
            max-width: 360px;
        }
        .footer h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 16px;
        }
        .footer ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer ul li a {
            font-size: 0.9rem;
            color: var(--text-weak);
            transition: color 0.2s;
        }
        .footer ul li a:hover {
            color: var(--primary);
        }
        .footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            border-top: 1px solid var(--border);
            font-size: 0.85rem;
            color: var(--text-weak);
        }
        .footer .footer-bottom i {
            color: var(--primary);
            margin-right: 4px;
        }

        /* ===== 移动端导航切换 ===== */
        .mobile-nav-toggle {
            display: none;
            position: fixed;
            top: 16px;
            right: 16px;
            z-index: 110;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 0.5rem;
            padding: 10px 14px;
            font-size: 1.2rem;
            color: var(--accent);
            box-shadow: var(--shadow);
            cursor: pointer;
            transition: background 0.2s;
        }
        .mobile-nav-toggle:hover {
            background: #f1f5f9;
        }
        .nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.4);
            z-index: 99;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .side-nav {
                width: 220px;
            }
            .main-content {
                margin-left: 220px;
            }
            .footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 768px) {
            body {
                flex-direction: column;
            }
            .mobile-nav-toggle {
                display: block;
            }
            .side-nav {
                transform: translateX(-100%);
                width: 270px;
                box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
            }
            .side-nav.open {
                transform: translateX(0);
            }
            .nav-overlay.open {
                display: block;
            }
            .main-content {
                margin-left: 0;
                padding-top: 0;
            }
            .main-content .page-header {
                padding: 28px 0 24px;
            }
            .main-content .page-header h1 {
                font-size: 1.6rem;
            }
            .main-content .page-header p {
                font-size: 0.95rem;
            }
            .main-content .page-body {
                padding: 28px 0 40px;
            }
            .footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer .footer-bottom {
                flex-direction: column;
                gap: 12px;
                text-align: center;
            }
            .section-title {
                font-size: 1.25rem;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 12px;
            }
            .main-content .page-header h1 {
                font-size: 1.35rem;
            }
            .main-content .page-header p {
                font-size: 0.9rem;
            }
            .btn-primary {
                padding: 10px 20px;
                font-size: 0.85rem;
            }
            .btn-outline {
                padding: 8px 18px;
                font-size: 0.8rem;
            }
            .footer {
                padding: 32px 0 24px;
            }
        }

        /* ===== 额外组件 ===== */
        .step-line {
            position: relative;
            padding-left: 32px;
        }
        .step-line::before {
            content: '';
            position: absolute;
            left: 11px;
            top: 8px;
            bottom: 8px;
            width: 2px;
            background: #fecaca;
        }
        .step-line .step-dot {
            position: absolute;
            left: 0;
            top: 4px;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 0.75rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .faq-item {
            border-bottom: 1px solid var(--border);
            padding: 20px 0;
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        .faq-item h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--accent);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .faq-item h4 i {
            color: var(--primary);
            font-size: 0.85rem;
        }
        .faq-item p {
            font-size: 0.92rem;
            color: var(--text-weak);
            line-height: 1.7;
            padding-left: 26px;
        }
        .stat-card {
            text-align: center;
            padding: 24px 16px;
        }
        .stat-card .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--text-weak);
            margin-top: 6px;
        }
        .entry-method-card {
            padding: 28px 24px;
            position: relative;
            overflow: hidden;
        }
        .entry-method-card .method-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: #fef2f2;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--primary);
            margin-bottom: 16px;
        }
        .entry-method-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 8px;
        }
        .entry-method-card p {
            font-size: 0.9rem;
            color: var(--text-weak);
            line-height: 1.6;
        }
        .entry-method-card .method-tag {
            position: absolute;
            top: 12px;
            right: 12px;
        }
        .safety-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            border-radius: 999px;
            font-size: 0.8rem;
            font-weight: 600;
            background: #ecfdf5;
            color: #065f46;
            border: 1px solid #a7f3d0;
        }
        .safety-badge i {
            color: #10b981;
        }