/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f172a;
            --primary-light: #1e293b;
            --accent: #0ea5e9;
            --accent-hover: #0284c7;
            --teal: #14b8a6;
            --teal-light: #5eead4;
            --bg: #f8fafc;
            --bg-alt: #f1f5f9;
            --card-bg: #ffffff;
            --text: #1e293b;
            --text-weak: #64748b;
            --text-light: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
            --shadow-hover: 0 12px 40px rgba(15, 23, 42, 0.10);
            --shadow-hero: 0 8px 32px rgba(15, 23, 42, 0.20);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --container: 1200px;
            --nav-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--accent-hover); }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        button { cursor: pointer; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 600; color: var(--primary); }
        h1 { font-size: 2.75rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.375rem; }
        h4 { font-size: 1.125rem; }

        /* ===== Container ===== */
        .container {
            width: 100%;
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(15, 23, 42, 0.96);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            height: var(--nav-height);
            display: flex;
            align-items: center;
        }
        header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo i { color: var(--accent); font-size: 1.6rem; }
        .logo span { background: linear-gradient(135deg, #fff 60%, var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .logo:hover { color: #fff; opacity: 0.92; }

        nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        nav a {
            color: rgba(255,255,255,0.75);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            position: relative;
        }
        nav a:hover { color: #fff; background: rgba(255,255,255,0.08); }
        nav a.active {
            color: #fff;
            background: rgba(14, 165, 233, 0.18);
            box-shadow: inset 0 0 0 1px rgba(14, 165, 233, 0.25);
        }
        nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 2px;
            background: var(--accent);
        }
        .nav-cta {
            background: var(--accent) !important;
            color: #fff !important;
            padding: 8px 22px !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 600;
            box-shadow: 0 2px 12px rgba(14, 165, 233, 0.30);
        }
        .nav-cta:hover { background: var(--accent-hover) !important; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(14, 165, 233, 0.35) !important; }

        .menu-toggle { display: none; color: #fff; font-size: 1.5rem; padding: 4px 8px; border-radius: 6px; }
        .menu-toggle:hover { background: rgba(255,255,255,0.08); }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 86vh;
            display: flex;
            align-items: center;
            background: var(--primary);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            transform: scale(1.04);
            transition: transform 8s ease;
        }
        .hero:hover .hero-bg { transform: scale(1.02); }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.88) 0%, rgba(15,23,42,0.60) 50%, rgba(14,165,233,0.15) 100%);
        }
        .hero .container {
            position: relative;
            z-index: 2;
            padding-top: 40px;
            padding-bottom: 60px;
        }
        .hero-content { max-width: 720px; }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(14, 165, 233, 0.18);
            border: 1px solid rgba(14, 165, 233, 0.25);
            color: var(--teal-light);
            font-size: 0.85rem;
            font-weight: 500;
            padding: 6px 16px;
            border-radius: 40px;
            margin-bottom: 24px;
            letter-spacing: 0.3px;
        }
        .hero-badge i { font-size: 0.75rem; }
        .hero h1 {
            font-size: 3.5rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero h1 em { font-style: normal; background: linear-gradient(135deg, var(--accent), var(--teal)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero p {
            font-size: 1.2rem;
            color: rgba(255,255,255,0.7);
            line-height: 1.8;
            margin-bottom: 32px;
            max-width: 600px;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 16px; }
        .hero-actions .btn-primary {
            padding: 14px 36px;
            font-size: 1.05rem;
            font-weight: 600;
            border-radius: var(--radius-sm);
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 20px rgba(14, 165, 233, 0.35);
            transition: all var(--transition);
        }
        .hero-actions .btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 10px 32px rgba(14, 165, 233, 0.40); }
        .hero-actions .btn-outline {
            padding: 14px 36px;
            font-size: 1.05rem;
            font-weight: 600;
            border-radius: var(--radius-sm);
            background: transparent;
            color: #fff;
            border: 1.5px solid rgba(255,255,255,0.25);
            transition: all var(--transition);
        }
        .hero-actions .btn-outline:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.4); transform: translateY(-2px); }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.08);
        }
        .hero-stat h4 { font-size: 1.75rem; font-weight: 700; color: #fff; letter-spacing: -0.3px; }
        .hero-stat h4 span { color: var(--accent); }
        .hero-stat p { font-size: 0.9rem; color: rgba(255,255,255,0.5); margin-bottom: 0; }

        /* ===== Section通用 ===== */
        section { padding: 80px 0; }
        .section-title { text-align: center; margin-bottom: 56px; }
        .section-title h2 { font-size: 2.25rem; font-weight: 700; color: var(--primary); margin-bottom: 12px; }
        .section-title p { color: var(--text-weak); font-size: 1.1rem; max-width: 600px; margin: 0 auto; }
        .section-title .title-accent { display: inline-block; width: 48px; height: 4px; border-radius: 4px; background: linear-gradient(90deg, var(--accent), var(--teal)); margin-top: 12px; }

        /* ===== 服务卡片 ===== */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .service-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: var(--accent); }
        .service-card .icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            background: linear-gradient(135deg, rgba(14,165,233,0.10), rgba(20,184,166,0.10));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.6rem;
            color: var(--accent);
            transition: all var(--transition);
        }
        .service-card:hover .icon { background: linear-gradient(135deg, rgba(14,165,233,0.18), rgba(20,184,166,0.18)); transform: scale(1.05); }
        .service-card h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 10px; }
        .service-card p { color: var(--text-weak); font-size: 0.95rem; line-height: 1.6; }

        /* ===== 分类入口 ===== */
        .category-section { background: var(--bg-alt); }
        .category-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--card-bg);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
        .category-card .cat-img {
            height: 200px;
            background: var(--primary-light);
            overflow: hidden;
        }
        .category-card .cat-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
        .category-card:hover .cat-img img { transform: scale(1.05); }
        .category-card .cat-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
        .category-card .cat-body h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 8px; color: var(--primary); }
        .category-card .cat-body p { color: var(--text-weak); font-size: 0.95rem; line-height: 1.6; margin-bottom: 16px; flex: 1; }
        .category-card .cat-meta { display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--border); padding-top: 16px; }
        .category-card .cat-tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 40px;
            font-size: 0.8rem;
            font-weight: 500;
            background: rgba(14,165,233,0.08);
            color: var(--accent);
        }
        .category-card .cat-link { font-weight: 600; font-size: 0.9rem; color: var(--accent); display: flex; align-items: center; gap: 6px; }

        /* ===== 资讯列表 ===== */
        .news-list { display: flex; flex-direction: column; gap: 16px; }
        .news-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            background: var(--card-bg);
            padding: 20px 24px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .news-item:hover { transform: translateX(4px); box-shadow: var(--shadow-hover); border-color: var(--accent); }
        .news-item .news-thumb {
            width: 110px;
            height: 78px;
            border-radius: var(--radius-sm);
            background: var(--bg-alt);
            overflow: hidden;
            flex-shrink: 0;
        }
        .news-item .news-thumb img { width: 100%; height: 100%; object-fit: cover; }
        .news-item .news-info { flex: 1; min-width: 0; }
        .news-item .news-info h4 { font-size: 1.05rem; font-weight: 600; margin-bottom: 4px; line-height: 1.4; }
        .news-item .news-info h4 a { color: var(--primary); transition: color var(--transition); }
        .news-item .news-info h4 a:hover { color: var(--accent); }
        .news-item .news-info p { color: var(--text-weak); font-size: 0.9rem; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .news-item .news-meta { display: flex; align-items: center; gap: 16px; margin-top: 8px; font-size: 0.82rem; color: var(--text-light); }
        .news-item .news-meta span { display: flex; align-items: center; gap: 4px; }
        .news-item .news-meta .cat-badge { background: rgba(14,165,233,0.08); color: var(--accent); padding: 2px 12px; border-radius: 40px; font-weight: 500; font-size: 0.75rem; }
        .news-empty {
            text-align: center;
            padding: 48px 24px;
            background: var(--card-bg);
            border-radius: var(--radius);
            border: 1px dashed var(--border);
            color: var(--text-weak);
        }
        .news-empty i { font-size: 2rem; color: var(--text-light); margin-bottom: 12px; display: block; }

        /* ===== 数据统计 ===== */
        .stats-section {
            background: var(--primary);
            position: relative;
            overflow: hidden;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            position: relative;
            z-index: 1;
        }
        .stat-card { text-align: center; padding: 24px; }
        .stat-card .num { font-size: 2.75rem; font-weight: 800; color: #fff; letter-spacing: -0.5px; }
        .stat-card .num span { color: var(--accent); }
        .stat-card .label { color: rgba(255,255,255,0.55); font-size: 0.95rem; margin-top: 6px; font-weight: 400; }
        .stat-card .stat-icon { font-size: 1.4rem; color: var(--teal); margin-bottom: 12px; opacity: 0.6; }

        /* ===== 流程 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 40px;
            counter-reset: step;
        }
        .step-card {
            text-align: center;
            padding: 32px 20px;
            position: relative;
        }
        .step-card::before {
            counter-increment: step;
            content: '0' counter(step);
            position: absolute;
            top: -8px;
            left: 50%;
            transform: translateX(-50%);
            font-size: 5rem;
            font-weight: 800;
            color: rgba(14,165,233,0.06);
            line-height: 1;
            letter-spacing: -2px;
            pointer-events: none;
        }
        .step-card .step-icon {
            width: 72px;
            height: 72px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(14,165,233,0.10), rgba(20,184,166,0.10));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.6rem;
            color: var(--accent);
            position: relative;
            z-index: 1;
        }
        .step-card h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 8px; }
        .step-card p { color: var(--text-weak); font-size: 0.95rem; line-height: 1.6; max-width: 260px; margin: 0 auto; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--card-bg);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--accent); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--primary);
            cursor: pointer;
            gap: 16px;
            transition: background var(--transition);
        }
        .faq-question:hover { background: rgba(14,165,233,0.04); }
        .faq-question i { color: var(--accent); font-size: 0.9rem; transition: transform var(--transition); flex-shrink: 0; }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-weak);
            line-height: 1.7;
            display: none;
        }
        .faq-item.active .faq-answer { display: block; }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            position: relative;
            overflow: hidden;
            padding: 80px 0;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.10;
        }
        .cta-content {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 640px;
            margin: 0 auto;
        }
        .cta-content h2 { font-size: 2.25rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
        .cta-content p { color: rgba(255,255,255,0.65); font-size: 1.1rem; margin-bottom: 32px; line-height: 1.7; }
        .cta-content .btn-primary {
            padding: 16px 44px;
            font-size: 1.1rem;
            font-weight: 600;
            border-radius: var(--radius-sm);
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 24px rgba(14, 165, 233, 0.35);
            transition: all var(--transition);
            display: inline-block;
        }
        .cta-content .btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 10px 36px rgba(14, 165, 233, 0.40); }

        /* ===== Footer ===== */
        footer {
            background: var(--primary);
            border-top: 1px solid rgba(255,255,255,0.06);
            padding: 56px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo { margin-bottom: 16px; }
        .footer-brand p { color: rgba(255,255,255,0.5); font-size: 0.95rem; line-height: 1.7; max-width: 320px; }
        .footer-col h4 { color: #fff; font-size: 1rem; font-weight: 600; margin-bottom: 16px; }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.5);
            font-size: 0.92rem;
            padding: 4px 0;
            transition: all var(--transition);
        }
        .footer-col a:hover { color: var(--accent); transform: translateX(4px); }
        .footer-col .social-links { display: flex; gap: 12px; margin-top: 12px; }
        .footer-col .social-links a {
            width: 40px; height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255,255,255,0.5);
            font-size: 1rem;
            transition: all var(--transition);
            padding: 0;
        }
        .footer-col .social-links a:hover { background: var(--accent); color: #fff; transform: translateY(-2px); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
        }
        .footer-bottom p { color: rgba(255,255,255,0.35); font-size: 0.85rem; }
        .footer-bottom a { color: rgba(255,255,255,0.35); font-size: 0.85rem; }
        .footer-bottom a:hover { color: var(--accent); }

        /* ===== 通用工具 ===== */
        .text-center { text-align: center; }
        .mt-12 { margin-top: 12px; }
        .mb-12 { margin-bottom: 12px; }
        .gap-8 { gap: 8px; }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .services-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
        }

        @media (max-width: 768px) {
            :root { --nav-height: 64px; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .hero h1 { font-size: 2.2rem; }
            .hero p { font-size: 1rem; }
            .hero-stats { gap: 24px; }
            .hero-stat h4 { font-size: 1.4rem; }
            section { padding: 56px 0; }
            .section-title { margin-bottom: 36px; }
            .section-title h2 { font-size: 1.6rem; }

            nav { display: none; }
            nav.open { display: flex; flex-direction: column; position: absolute; top: var(--nav-height); left: 0; right: 0; background: rgba(15,23,42,0.98); backdrop-filter: blur(16px); padding: 16px 24px 24px; border-bottom: 1px solid rgba(255,255,255,0.06); gap: 4px; }
            nav.open a { padding: 12px 16px; }
            .menu-toggle { display: block; }

            .services-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
            .service-card { padding: 24px 16px; }

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

            .news-item { flex-direction: column; padding: 16px; }
            .news-item .news-thumb { width: 100%; height: 140px; }

            .steps-grid { grid-template-columns: 1fr; gap: 24px; }

            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .stat-card .num { font-size: 2rem; }

            .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }

            .cta-content h2 { font-size: 1.6rem; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .hero h1 { font-size: 1.7rem; }
            .services-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
            .hero-actions { flex-direction: column; }
            .hero-actions .btn-primary, .hero-actions .btn-outline { width: 100%; text-align: center; }
            .hero-stat h4 { font-size: 1.2rem; }
            .section-title h2 { font-size: 1.4rem; }
        }

        /* ===== 辅助 ===== */
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
        :focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
        ::selection { background: rgba(14, 165, 233, 0.20); }

/* roulang page: category1 */
/* ===== CSS Variables / Design System ===== */
        :root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8c;
            --primary-dark: #0f1f33;
            --accent: #e8b84b;
            --accent-light: #f0d080;
            --accent-dark: #c99a2e;
            --bg-body: #f4f7fb;
            --bg-white: #ffffff;
            --bg-section-alt: #eef2f7;
            --bg-dark: #0f1f33;
            --text-primary: #1a2a3a;
            --text-secondary: #4a5a6a;
            --text-light: #7a8a9a;
            --text-white: #f0f4f8;
            --border-color: #dce4ec;
            --border-light: #e8eef4;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --shadow-accent: 0 4px 20px rgba(232, 184, 75, 0.3);
            --font-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --transition: 0.25s ease;
            --max-width: 1200px;
            --header-height: 72px;
            --spacing-section: 5rem;
            --spacing-block: 3rem;
        }

        /* ===== 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-base);
            font-size: 1rem;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            padding-top: var(--header-height);
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent-dark);
        }
        a:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 2px;
            border-radius: 4px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }
        h1 {
            font-size: 2.8rem;
        }
        h2 {
            font-size: 2.2rem;
            margin-bottom: 1rem;
        }
        h3 {
            font-size: 1.5rem;
        }
        h4 {
            font-size: 1.2rem;
        }
        p {
            margin-bottom: 1rem;
            color: var(--text-secondary);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        .section-label {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 1px;
            text-transform: uppercase;
            color: var(--accent-dark);
            background: rgba(232, 184, 75, 0.12);
            padding: 0.3rem 1rem;
            border-radius: 50px;
            margin-bottom: 0.75rem;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary-dark);
            margin-bottom: 0.75rem;
        }
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin-bottom: 2.5rem;
        }
        .text-center {
            text-align: center;
        }
        .text-center .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }
        .badge {
            display: inline-block;
            background: var(--accent);
            color: var(--primary-dark);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 0.2rem 0.75rem;
            border-radius: 50px;
            letter-spacing: 0.3px;
        }
        .badge-sm {
            font-size: 0.7rem;
            padding: 0.15rem 0.6rem;
        }
        .badge-outline {
            background: transparent;
            border: 1.5px solid var(--accent);
            color: var(--accent-dark);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 1.8rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: 2px solid transparent;
            background: transparent;
            color: var(--text-primary);
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary-dark);
            border-color: var(--accent);
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-accent);
        }
        .btn-outline {
            border-color: var(--primary-light);
            color: var(--primary-light);
            background: transparent;
        }
        .btn-outline:hover {
            background: var(--primary-light);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-white {
            background: #fff;
            color: var(--primary-dark);
            border-color: #fff;
        }
        .btn-white:hover {
            background: var(--accent);
            border-color: var(--accent);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-sm {
            padding: 0.45rem 1.2rem;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 0.95rem 2.5rem;
            font-size: 1.05rem;
        }
        .btn:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 2px;
        }

        /* ===== Header / Navigation ===== */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.04);
            transition: background var(--transition);
        }
        header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary-dark);
            text-decoration: none;
            transition: opacity var(--transition);
        }
        .logo i {
            color: var(--accent);
            font-size: 1.8rem;
        }
        .logo span {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo:hover {
            opacity: 0.85;
        }
        nav {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        nav a {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.5rem 1.2rem;
            border-radius: 50px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            text-decoration: none;
            position: relative;
        }
        nav a:hover {
            color: var(--primary);
            background: rgba(26, 58, 92, 0.06);
        }
        nav a.active {
            color: var(--primary-dark);
            background: rgba(26, 58, 92, 0.08);
            font-weight: 600;
        }
        nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent);
            border-radius: 4px;
        }
        nav a.nav-cta {
            background: var(--accent);
            color: var(--primary-dark);
            font-weight: 600;
            padding: 0.5rem 1.5rem;
            border: 2px solid var(--accent);
        }
        nav a.nav-cta:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-accent);
        }
        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--primary-dark);
            background: none;
            border: none;
            padding: 0.5rem;
            cursor: pointer;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(26, 58, 92, 0.06);
        }

        /* ===== Hero / Banner ===== */
        .page-hero {
            padding: 4rem 0 3.5rem;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center center;
            background-repeat: no-repeat;
            position: relative;
            min-height: 320px;
            display: flex;
            align-items: center;
            isolation: isolate;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 31, 51, 0.88) 40%, rgba(26, 58, 92, 0.72) 100%);
            z-index: 0;
        }
        .page-hero .container {
            position: relative;
            z-index: 1;
            color: var(--text-white);
        }
        .page-hero h1 {
            color: #fff;
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 0.75rem;
            letter-spacing: -0.5px;
        }
        .page-hero h1 i {
            color: var(--accent);
            margin-right: 0.5rem;
        }
        .page-hero p {
            color: rgba(240, 248, 255, 0.85);
            font-size: 1.15rem;
            max-width: 680px;
            margin-bottom: 1.5rem;
        }
        .page-hero .breadcrumb {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.9rem;
            color: rgba(240, 248, 255, 0.7);
            margin-bottom: 1rem;
        }
        .page-hero .breadcrumb a {
            color: var(--accent-light);
        }
        .page-hero .breadcrumb a:hover {
            color: var(--accent);
        }
        .page-hero .breadcrumb span {
            color: rgba(240, 248, 255, 0.5);
        }

        /* ===== Section Spacing ===== */
        section {
            padding: var(--spacing-section) 0;
        }
        section.alt-bg {
            background: var(--bg-section-alt);
        }
        section.dark-bg {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        section.dark-bg .section-title,
        section.dark-bg h2,
        section.dark-bg h3 {
            color: #fff;
        }
        section.dark-bg p {
            color: rgba(240, 248, 255, 0.8);
        }

        /* ===== Category Grid ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
            gap: 1.8rem;
        }
        .category-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 1.8rem 1.5rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--accent-light);
        }
        .category-card .card-icon {
            width: 52px;
            height: 52px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-md);
            font-size: 1.6rem;
            color: var(--primary-light);
            background: rgba(26, 58, 92, 0.08);
            transition: all var(--transition);
        }
        .category-card:hover .card-icon {
            background: var(--accent);
            color: var(--primary-dark);
        }
        .category-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin: 0;
        }
        .category-card p {
            font-size: 0.92rem;
            color: var(--text-light);
            margin: 0;
            flex: 1;
        }
        .category-card .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem;
            margin-top: 0.3rem;
        }
        .category-card .tag-list span {
            font-size: 0.75rem;
            background: var(--bg-section-alt);
            padding: 0.2rem 0.7rem;
            border-radius: 50px;
            color: var(--text-secondary);
            border: 1px solid var(--border-light);
        }
        .category-card .card-link {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--primary-light);
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            margin-top: 0.3rem;
            transition: gap var(--transition);
        }
        .category-card .card-link:hover {
            gap: 0.7rem;
            color: var(--accent-dark);
        }

        /* ===== Article / Content Cards ===== */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 2rem;
        }
        .article-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .article-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .article-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
            display: block;
        }
        .article-card .card-body {
            padding: 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 0.6rem;
        }
        .article-card .card-body .meta {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.8rem;
            color: var(--text-light);
        }
        .article-card .card-body .meta i {
            margin-right: 3px;
        }
        .article-card .card-body h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin: 0;
            line-height: 1.4;
        }
        .article-card .card-body h3 a {
            color: var(--text-primary);
        }
        .article-card .card-body h3 a:hover {
            color: var(--primary-light);
        }
        .article-card .card-body p {
            font-size: 0.92rem;
            color: var(--text-light);
            margin: 0;
            flex: 1;
        }
        .article-card .card-body .read-more {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--primary-light);
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            transition: gap var(--transition);
        }
        .article-card .card-body .read-more:hover {
            gap: 0.7rem;
            color: var(--accent-dark);
        }

        /* ===== Stats / Data Section ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
        }
        .stat-item {
            text-align: center;
            padding: 2rem 1rem;
            background: rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: background var(--transition);
        }
        .stat-item:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .stat-item .num {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .stat-item .label {
            font-size: 0.95rem;
            color: rgba(240, 248, 255, 0.8);
            margin-top: 0.3rem;
        }

        /* ===== Flow / Process ===== */
        .flow-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 2rem;
            counter-reset: flow-step;
        }
        .flow-step {
            text-align: center;
            padding: 2rem 1.5rem;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            position: relative;
            transition: all var(--transition);
        }
        .flow-step:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        .flow-step::before {
            counter-increment: flow-step;
            content: counter(flow-step);
            display: block;
            width: 44px;
            height: 44px;
            line-height: 44px;
            text-align: center;
            border-radius: 50%;
            background: var(--accent);
            color: var(--primary-dark);
            font-weight: 800;
            font-size: 1.2rem;
            margin: 0 auto 1rem;
        }
        .flow-step h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.4rem;
        }
        .flow-step p {
            font-size: 0.9rem;
            color: var(--text-light);
            margin: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 1.2rem 1.5rem;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-primary);
            background: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            cursor: pointer;
            transition: background var(--transition);
            border: none;
        }
        .faq-question:hover {
            background: rgba(26, 58, 92, 0.03);
        }
        .faq-question i {
            color: var(--accent-dark);
            font-size: 1.1rem;
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 1.5rem;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 1.5rem 1.2rem;
        }

        /* ===== CTA ===== */
        .cta-block {
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            border-radius: var(--radius-lg);
            padding: 4rem 3rem;
            text-align: center;
            position: relative;
            isolation: isolate;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 31, 51, 0.9) 50%, rgba(26, 58, 92, 0.75) 100%);
            z-index: 0;
            border-radius: inherit;
        }
        .cta-block>* {
            position: relative;
            z-index: 1;
        }
        .cta-block h2 {
            color: #fff;
            font-size: 2rem;
            margin-bottom: 0.75rem;
        }
        .cta-block p {
            color: rgba(240, 248, 255, 0.85);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto 2rem;
        }
        .cta-block .btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 1rem;
        }

        /* ===== Footer ===== */
        footer {
            background: var(--bg-dark);
            color: var(--text-white);
            padding: 3.5rem 0 0;
        }
        footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 2.5rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        footer .footer-brand .logo {
            color: #fff;
            margin-bottom: 0.8rem;
        }
        footer .footer-brand .logo span {
            background: linear-gradient(135deg, #fff, var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        footer .footer-brand p {
            font-size: 0.9rem;
            color: rgba(240, 248, 255, 0.65);
            line-height: 1.7;
            margin: 0;
        }
        footer .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 1rem;
            letter-spacing: 0.5px;
        }
        footer .footer-col a {
            display: block;
            color: rgba(240, 248, 255, 0.7);
            font-size: 0.9rem;
            padding: 0.3rem 0;
            transition: color var(--transition);
        }
        footer .footer-col a:hover {
            color: var(--accent);
        }
        footer .social-links {
            display: flex;
            gap: 0.8rem;
            margin-top: 0.8rem;
        }
        footer .social-links a {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(240, 248, 255, 0.8);
            font-size: 1.1rem;
            padding: 0;
            transition: all var(--transition);
        }
        footer .social-links a:hover {
            background: var(--accent);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }
        footer .footer-bottom {
            padding: 1.5rem 0;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 0.8rem;
            font-size: 0.85rem;
            color: rgba(240, 248, 255, 0.5);
        }
        footer .footer-bottom a {
            color: rgba(240, 248, 255, 0.7);
        }
        footer .footer-bottom a:hover {
            color: var(--accent);
        }
        footer .footer-bottom p {
            margin: 0;
            color: rgba(240, 248, 255, 0.5);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 2rem;
            }
            .article-grid {
                grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            }
        }
        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
                --spacing-section: 3.5rem;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .page-hero h1 {
                font-size: 2.2rem;
            }
            .page-hero p {
                font-size: 1rem;
            }

            /* Mobile nav */
            nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                -webkit-backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 1rem 1.5rem;
                gap: 0.3rem;
                border-bottom: 1px solid var(--border-light);
                box-shadow: var(--shadow-md);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.35s ease;
                pointer-events: none;
            }
            nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            nav a {
                width: 100%;
                justify-content: center;
                padding: 0.7rem 1rem;
                border-radius: var(--radius-sm);
            }
            nav a.active::after {
                display: none;
            }
            nav a.nav-cta {
                margin-top: 0.3rem;
            }
            .nav-toggle {
                display: block;
            }

            .category-grid {
                grid-template-columns: 1fr 1fr;
            }
            .article-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .flow-grid {
                grid-template-columns: 1fr 1fr;
            }
            .cta-block {
                padding: 2.5rem 1.5rem;
            }
            footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            :root {
                --spacing-section: 2.5rem;
            }
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .page-hero h1 {
                font-size: 1.8rem;
            }
            .category-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .flow-grid {
                grid-template-columns: 1fr;
            }
            .article-grid {
                grid-template-columns: 1fr;
            }
            .page-hero {
                min-height: 240px;
                padding: 2.5rem 0;
            }
            .cta-block h2 {
                font-size: 1.5rem;
            }
        }

        /* ===== Utility ===== */
        .mt-1 {
            margin-top: 1rem;
        }
        .mt-2 {
            margin-top: 2rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .mb-2 {
            margin-bottom: 2rem;
        }
        .gap-1 {
            gap: 1rem;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a3a5c;
            --primary-dark: #0f2440;
            --primary-light: #2a5a8c;
            --accent: #c9a84c;
            --accent-light: #e0c66a;
            --accent-dark: #a88a30;
            --bg: #f5f7fa;
            --bg-white: #ffffff;
            --bg-dark: #0f2440;
            --text: #1a2a3a;
            --text-light: #6b7a8a;
            --text-white: #ffffff;
            --border: #e2e6ea;
            --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
            --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --transition: all 0.3s ease;
            --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
        }

        /* ===== 基础重置 ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            transition: var(--transition);
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--primary-dark);
        }

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

        /* ===== 导航 ===== */
        header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--bg-dark);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
            height: var(--header-h);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-h);
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: 0.5px;
            transition: var(--transition);
        }
        .logo i {
            color: var(--accent);
            font-size: 1.8rem;
        }
        .logo:hover {
            color: var(--accent-light);
        }
        .logo span {
            background: linear-gradient(135deg, #fff 60%, var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        nav a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.8);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
            position: relative;
        }
        nav a:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.08);
        }
        nav a.active {
            color: #fff;
            background: var(--primary-light);
        }
        nav a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent);
            border-radius: 2px;
        }
        nav a.nav-cta {
            background: var(--accent);
            color: var(--primary-dark);
            font-weight: 700;
            padding: 8px 22px;
            border-radius: var(--radius-sm);
            box-shadow: 0 2px 10px rgba(201, 168, 76, 0.3);
        }
        nav a.nav-cta:hover {
            background: var(--accent-light);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(201, 168, 76, 0.4);
        }
        .menu-toggle {
            display: none;
            background: none;
            color: #fff;
            font-size: 1.6rem;
            padding: 4px 8px;
            cursor: pointer;
            border-radius: 6px;
            transition: var(--transition);
        }
        .menu-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: block;
            }
            nav {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: var(--bg-dark);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 2px solid var(--accent);
                box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                border-radius: 0 0 var(--radius) var(--radius);
            }
            nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1.05rem;
            }
            nav a.active::after {
                bottom: 4px;
                width: 30px;
            }
            nav a.nav-cta {
                margin-top: 6px;
                text-align: center;
                justify-content: center;
            }
        }

        /* ===== 文章Banner ===== */
        .article-banner {
            position: relative;
            padding: 80px 0 60px;
            min-height: 320px;
            display: flex;
            align-items: center;
            background: var(--primary-dark);
            overflow: hidden;
        }
        .article-banner-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            z-index: 0;
        }
        .article-banner .overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 36, 64, 0.88) 40%, rgba(26, 58, 92, 0.7) 80%);
            z-index: 1;
        }
        .article-banner .container {
            position: relative;
            z-index: 2;
        }
        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .article-breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }
        .article-breadcrumb a:hover {
            color: var(--accent);
        }
        .article-breadcrumb span {
            color: rgba(255, 255, 255, 0.4);
        }
        .article-banner h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: #fff;
            max-width: 860px;
            line-height: 1.25;
            margin-bottom: 20px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px 28px;
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.8);
        }
        .article-meta .category-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--accent);
            color: var(--primary-dark);
            padding: 4px 16px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.85rem;
        }
        .article-meta i {
            color: var(--accent);
            width: 16px;
        }
        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        @media (max-width: 768px) {
            .article-banner {
                padding: 50px 0 40px;
                min-height: 240px;
            }
            .article-banner h1 {
                font-size: 1.8rem;
            }
            .article-meta {
                gap: 12px 20px;
                font-size: 0.85rem;
            }
        }
        @media (max-width: 520px) {
            .article-banner h1 {
                font-size: 1.5rem;
            }
            .article-banner {
                padding: 36px 0 30px;
                min-height: 200px;
            }
        }

        /* ===== 文章正文区 ===== */
        .article-main {
            padding: 50px 0 60px;
            background: var(--bg-white);
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
        }
        .article-body {
            min-width: 0;
        }
        .article-cover {
            border-radius: var(--radius);
            overflow: hidden;
            margin-bottom: 32px;
            box-shadow: var(--shadow);
        }
        .article-cover img {
            width: 100%;
            height: auto;
            max-height: 480px;
            object-fit: cover;
            border-radius: var(--radius);
        }
        .article-content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }
        .article-content p {
            margin-bottom: 1.2em;
        }
        .article-content h2,
        .article-content h3 {
            margin-top: 1.6em;
            margin-bottom: 0.6em;
            color: var(--primary-dark);
        }
        .article-content h2 {
            font-size: 1.6rem;
        }
        .article-content h3 {
            font-size: 1.25rem;
        }
        .article-content ul,
        .article-content ol {
            margin: 0 0 1.2em 1.6em;
        }
        .article-content li {
            margin-bottom: 0.4em;
        }
        .article-content ul li {
            list-style: disc;
        }
        .article-content ol li {
            list-style: decimal;
        }
        .article-content a {
            color: var(--primary-light);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-content a:hover {
            color: var(--accent-dark);
        }
        .article-content blockquote {
            border-left: 4px solid var(--accent);
            background: var(--bg);
            padding: 16px 24px;
            margin: 1.2em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-style: italic;
            color: var(--text-light);
        }
        .article-content img {
            border-radius: var(--radius-sm);
            margin: 1.2em 0;
            box-shadow: var(--shadow);
        }
        .article-content pre {
            background: var(--bg-dark);
            color: #e8e8e8;
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            font-size: 0.9rem;
            margin: 1.2em 0;
        }
        .article-content code {
            background: var(--bg);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
        }

        /* 侧边栏 */
        .article-sidebar {
            position: sticky;
            top: calc(var(--header-h) + 30px);
            align-self: start;
        }
        .sidebar-card {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 28px 24px;
            margin-bottom: 24px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }
        .sidebar-card h3 {
            font-size: 1.15rem;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--primary);
        }
        .sidebar-card h3 i {
            color: var(--accent);
        }
        .sidebar-list li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border);
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }
        .sidebar-list li:last-child {
            border-bottom: none;
        }
        .sidebar-list li a {
            font-size: 0.92rem;
            color: var(--text);
            line-height: 1.4;
        }
        .sidebar-list li a:hover {
            color: var(--primary-light);
        }
        .sidebar-list .num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 26px;
            height: 26px;
            background: var(--primary-light);
            color: #fff;
            border-radius: 50%;
            font-size: 0.75rem;
            font-weight: 700;
            flex-shrink: 0;
        }
        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            color: #fff;
            border: none;
        }
        .sidebar-cta h3 {
            color: var(--accent);
        }
        .sidebar-cta p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 0.95rem;
            margin-bottom: 18px;
        }
        .sidebar-cta .btn {
            background: var(--accent);
            color: var(--primary-dark);
            font-weight: 700;
            width: 100%;
            text-align: center;
            padding: 12px;
            border-radius: var(--radius-sm);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            transition: var(--transition);
        }
        .sidebar-cta .btn:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(201, 168, 76, 0.3);
        }

        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .article-sidebar {
                position: static;
            }
            .sidebar-card {
                padding: 20px 18px;
            }
        }

        /* ===== 内容未找到 ===== */
        .not-found-wrap {
            padding: 100px 0;
            text-align: center;
            background: var(--bg-white);
        }
        .not-found-wrap .icon-big {
            font-size: 4rem;
            color: var(--text-light);
            margin-bottom: 20px;
            opacity: 0.5;
        }
        .not-found-wrap h1 {
            font-size: 2rem;
            margin-bottom: 12px;
        }
        .not-found-wrap p {
            font-size: 1.1rem;
            color: var(--text-light);
            margin-bottom: 28px;
        }
        .not-found-wrap .btn-home {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            padding: 12px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: var(--transition);
        }
        .not-found-wrap .btn-home:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(26, 58, 92, 0.3);
        }

        /* ===== 相关文章 ===== */
        .related-section {
            padding: 60px 0;
            background: var(--bg);
        }
        .related-section .section-header {
            text-align: center;
            margin-bottom: 40px;
        }
        .related-section .section-header h2 {
            font-size: 2rem;
            color: var(--primary-dark);
            margin-bottom: 8px;
        }
        .related-section .section-header p {
            color: var(--text-light);
            font-size: 1.05rem;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
            gap: 28px;
        }
        .related-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid var(--border);
        }
        .related-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: var(--accent-light);
        }
        .related-card .card-img {
            height: 180px;
            overflow: hidden;
            background: var(--primary-dark);
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
            border-radius: 0;
        }
        .related-card:hover .card-img img {
            transform: scale(1.05);
        }
        .related-card .card-body {
            padding: 20px 20px 24px;
        }
        .related-card .card-body .cat {
            display: inline-block;
            font-size: 0.78rem;
            font-weight: 600;
            color: var(--accent-dark);
            background: rgba(201, 168, 76, 0.12);
            padding: 2px 12px;
            border-radius: 12px;
            margin-bottom: 10px;
            text-transform: uppercase;
            letter-spacing: 0.3px;
        }
        .related-card .card-body h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--primary-dark);
            line-height: 1.4;
        }
        .related-card .card-body h3 a {
            color: inherit;
        }
        .related-card .card-body h3 a:hover {
            color: var(--primary-light);
        }
        .related-card .card-body p {
            font-size: 0.88rem;
            color: var(--text-light);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body .meta {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-top: 14px;
            font-size: 0.82rem;
            color: var(--text-light);
        }
        .related-card .card-body .meta i {
            width: 14px;
            color: var(--accent);
        }

        @media (max-width: 600px) {
            .related-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .related-section .section-header h2 {
                font-size: 1.5rem;
            }
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 60px 0;
            background: var(--bg-white);
        }
        .faq-section .section-header {
            text-align: center;
            margin-bottom: 40px;
        }
        .faq-section .section-header h2 {
            font-size: 2rem;
            color: var(--primary-dark);
            margin-bottom: 8px;
        }
        .faq-section .section-header p {
            color: var(--text-light);
            font-size: 1.05rem;
        }
        .faq-grid {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--accent-light);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--primary-dark);
            gap: 12px;
            user-select: none;
            transition: var(--transition);
        }
        .faq-question:hover {
            background: rgba(201, 168, 76, 0.05);
        }
        .faq-question i {
            color: var(--accent);
            transition: var(--transition);
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 22px 18px;
            font-size: 0.95rem;
            color: var(--text-light);
            line-height: 1.7;
            display: none;
        }
        .faq-answer.open {
            display: block;
        }
        .faq-answer p {
            margin-bottom: 0.6em;
        }
        .faq-answer p:last-child {
            margin-bottom: 0;
        }

        @media (max-width: 600px) {
            .faq-section .section-header h2 {
                font-size: 1.5rem;
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 16px 14px;
                font-size: 0.88rem;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 70px 0;
            background: var(--primary-dark);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.12;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            color: #fff;
            margin-bottom: 14px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 640px;
            margin: 0 auto 30px;
        }
        .cta-section .btn-group {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .cta-section .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: var(--primary-dark);
            font-weight: 700;
            padding: 14px 34px;
            border-radius: var(--radius-sm);
            font-size: 1.05rem;
            transition: var(--transition);
            box-shadow: 0 4px 20px rgba(201, 168, 76, 0.3);
        }
        .cta-section .btn-primary:hover {
            background: var(--accent-light);
            transform: translateY(-3px);
            box-shadow: 0 8px 30px rgba(201, 168, 76, 0.4);
        }
        .cta-section .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: #fff;
            font-weight: 600;
            padding: 14px 34px;
            border-radius: var(--radius-sm);
            font-size: 1.05rem;
            border: 2px solid rgba(255, 255, 255, 0.3);
            transition: var(--transition);
        }
        .cta-section .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-3px);
            background: rgba(255, 255, 255, 0.05);
        }

        @media (max-width: 600px) {
            .cta-section {
                padding: 50px 0;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .cta-section .btn-group {
                flex-direction: column;
                gap: 12px;
            }
            .cta-section .btn-primary,
            .cta-section .btn-outline {
                width: 100%;
                justify-content: center;
            }
        }

        /* ===== 页脚 ===== */
        footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 56px 0 0;
            border-top: 3px solid var(--accent);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo {
            font-size: 1.4rem;
            margin-bottom: 14px;
            display: inline-flex;
        }
        .footer-brand p {
            font-size: 0.92rem;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.7;
            max-width: 360px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 30px;
            height: 3px;
            background: var(--accent);
            border-radius: 2px;
        }
        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.9rem;
            padding: 5px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-col .social-links {
            display: flex;
            gap: 12px;
            margin-top: 16px;
        }
        .footer-col .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 50%;
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.2rem;
            padding: 0;
            transition: var(--transition);
        }
        .footer-col .social-links a:hover {
            background: var(--accent);
            color: var(--primary-dark);
            padding: 0;
            transform: translateY(-2px);
        }
        .footer-bottom {
            padding: 20px 0;
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.6);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }
        .footer-bottom p {
            margin: 2px 0;
        }

        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }
        @media (max-width: 600px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            footer {
                padding: 40px 0 0;
            }
        }

        /* ===== 通用工具 ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }

        /* ===== 按钮通用 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            border: none;
        }
        .btn:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 2px;
        }

        /* ===== 响应式微调 ===== */
        @media (max-width: 520px) {
            .article-content {
                font-size: 0.95rem;
            }
            .article-content h2 {
                font-size: 1.3rem;
            }
            .article-content h3 {
                font-size: 1.1rem;
            }
        }