/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --color-primary: #4F46E5;
            --color-primary-dark: #3730A3;
            --color-primary-light: #818CF8;
            --color-secondary: #10B981;
            --color-secondary-dark: #059669;
            --color-accent: #F59E0B;
            --color-bg: #F8FAFC;
            --color-bg-alt: #F1F5F9;
            --color-bg-dark: #1E293B;
            --color-text: #1E293B;
            --color-text-soft: #64748B;
            --color-text-light: #94A3B8;
            --color-border: #E2E8F0;
            --color-white: #FFFFFF;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 36px rgba(0,0,0,0.12);
            --shadow-xl: 0 24px 48px rgba(0,0,0,0.16);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.6;
            color: var(--color-text);
            background: var(--color-bg);
        }
        a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--color-primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        button { cursor: pointer; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--color-text); }

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

        /* ===== 间距系统 ===== */
        .section { padding: 80px 0; }
        .section-sm { padding: 48px 0; }
        .section-lg { padding: 120px 0; }
        @media (max-width: 768px) {
            .section { padding: 48px 0; }
            .section-lg { padding: 64px 0; }
        }

        .text-center { text-align: center; }
        .mb-8 { margin-bottom: 8px; }
        .mb-16 { margin-bottom: 16px; }
        .mb-24 { margin-bottom: 24px; }
        .mb-32 { margin-bottom: 32px; }
        .mb-40 { margin-bottom: 40px; }
        .mb-48 { margin-bottom: 48px; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }

        /* ===== 标题 ===== */
        .section-title {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }
        .section-sub {
            font-size: 18px;
            color: var(--color-text-soft);
            max-width: 640px;
            margin: 0 auto 40px;
            line-height: 1.7;
        }
        @media (max-width: 768px) {
            .section-title { font-size: 28px; }
            .section-sub { font-size: 16px; margin-bottom: 28px; }
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 16px;
            transition: all var(--transition);
            border: 2px solid transparent;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--color-primary);
            color: var(--color-white);
            border-color: var(--color-primary);
        }
        .btn-primary:hover {
            background: var(--color-primary-dark);
            border-color: var(--color-primary-dark);
            color: var(--color-white);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-secondary {
            background: transparent;
            color: var(--color-primary);
            border-color: var(--color-primary);
        }
        .btn-secondary:hover {
            background: var(--color-primary);
            color: var(--color-white);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-white {
            background: var(--color-white);
            color: var(--color-primary);
            border-color: var(--color-white);
        }
        .btn-white:hover {
            background: var(--color-bg-alt);
            border-color: var(--color-bg-alt);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-sm { padding: 10px 20px; font-size: 14px; }
        .btn-lg { padding: 18px 40px; font-size: 18px; }
        .btn:focus-visible { outline: 3px solid var(--color-primary-light); outline-offset: 2px; }

        /* ===== 徽章 / 标签 ===== */
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            background: var(--color-primary-light);
            color: var(--color-white);
            letter-spacing: 0.3px;
        }
        .badge-green { background: var(--color-secondary); }
        .badge-amber { background: var(--color-accent); color: #1E293B; }
        .badge-outline {
            background: transparent;
            border: 1.5px solid var(--color-border);
            color: var(--color-text-soft);
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--color-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border);
            padding: 24px;
            transition: all var(--transition);
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: transparent;
        }
        .card-img {
            border-radius: var(--radius-md) var(--radius-md) 0 0;
            overflow: hidden;
            margin: -24px -24px 16px -24px;
        }
        .card-img img { width: 100%; height: 200px; object-fit: cover; transition: transform 0.5s; }
        .card:hover .card-img img { transform: scale(1.05); }
        .card-title { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
        .card-text { color: var(--color-text-soft); font-size: 15px; line-height: 1.7; }

        /* ===== 网格 ===== */
        .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
        .grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 28px; }
        .grid-4 { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 24px; }
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; gap: 20px; }
        }

        /* ===== 导航 ===== */
        .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(--color-border);
            transition: box-shadow var(--transition);
        }
        .header.scrolled { box-shadow: var(--shadow-md); }
        .header-inner {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .header-logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--color-primary);
            letter-spacing: -0.3px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .header-logo i { font-size: 26px; }
        .header-logo:hover { color: var(--color-primary-dark); }
        .header-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .header-nav a {
            padding: 8px 18px;
            border-radius: 50px;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text-soft);
            transition: all var(--transition);
            position: relative;
        }
        .header-nav a:hover { color: var(--color-primary); background: var(--color-bg-alt); }
        .header-nav a.active {
            color: var(--color-primary);
            background: rgba(79,70,229,0.1);
            font-weight: 600;
        }
        .header-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 2px;
            background: var(--color-primary);
        }
        .header-actions { display: flex; align-items: center; gap: 12px; }
        .header-actions .btn { padding: 10px 22px; font-size: 14px; }
        .menu-toggle { display: none; font-size: 26px; color: var(--color-text); padding: 4px; }
        .menu-toggle:focus-visible { outline: 3px solid var(--color-primary-light); outline-offset: 2px; border-radius: 4px; }

        @media (max-width: 768px) {
            .header-nav {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--color-white);
                border-bottom: 1px solid var(--color-border);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                box-shadow: var(--shadow-lg);
            }
            .header-nav.open { display: flex; }
            .header-nav a { width: 100%; padding: 12px 16px; }
            .header-nav a.active::after { display: none; }
            .menu-toggle { display: block; }
            .header-actions .btn { display: none; }
        }

        /* ===== Hero ===== */
        .hero {
            padding: 160px 0 80px;
            background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 50%, #C7D2FE 100%);
            position: relative;
            overflow: hidden;
            min-height: 600px;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.15;
            pointer-events: none;
        }
        .hero-bg-shape {
            position: absolute;
            border-radius: 50%;
            background: rgba(79,70,229,0.06);
            pointer-events: none;
        }
        .hero-bg-shape.s1 { width: 500px; height: 500px; top: -120px; right: -80px; }
        .hero-bg-shape.s2 { width: 300px; height: 300px; bottom: -60px; left: -60px; }
        .hero .container { position: relative; z-index: 2; }
        .hero-content { max-width: 720px; }
        .hero-badge { margin-bottom: 20px; }
        .hero-title {
            font-size: 52px;
            font-weight: 900;
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -1px;
        }
        .hero-title span { color: var(--color-primary); }
        .hero-desc {
            font-size: 20px;
            color: var(--color-text-soft);
            max-width: 560px;
            line-height: 1.7;
            margin-bottom: 36px;
        }
        .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(79,70,229,0.15);
        }
        .hero-stat h3 { font-size: 32px; font-weight: 800; color: var(--color-primary); }
        .hero-stat p { font-size: 14px; color: var(--color-text-soft); margin-top: 2px; }
        @media (max-width: 768px) {
            .hero { padding: 120px 0 48px; min-height: auto; }
            .hero-title { font-size: 32px; }
            .hero-desc { font-size: 17px; }
            .hero-stats { gap: 24px; flex-wrap: wrap; }
            .hero-stat h3 { font-size: 26px; }
        }
        @media (max-width: 520px) {
            .hero-title { font-size: 28px; }
            .hero-actions { flex-direction: column; }
            .hero-actions .btn { width: 100%; justify-content: center; }
            .hero-stats { flex-direction: column; gap: 16px; }
        }

        /* ===== 特色板块 ===== */
        .features-grid { margin-top: 8px; }
        .feature-card {
            background: var(--color-white);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            border: 1px solid var(--color-border);
            transition: all var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-6px);
            border-color: transparent;
        }
        .feature-icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 28px;
            color: var(--color-white);
            background: var(--color-primary);
        }
        .feature-icon.green { background: var(--color-secondary); }
        .feature-icon.amber { background: var(--color-accent); }
        .feature-icon.pink { background: #EC4899; }
        .feature-card h3 { font-size: 20px; margin-bottom: 10px; }
        .feature-card p { color: var(--color-text-soft); font-size: 15px; line-height: 1.7; }

        /* ===== 功能详解（图文） ===== */
        .detail-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .detail-img {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }
        .detail-img img { width: 100%; height: 400px; object-fit: cover; }
        .detail-content h2 { font-size: 34px; margin-bottom: 16px; }
        .detail-content p { color: var(--color-text-soft); font-size: 16px; line-height: 1.8; margin-bottom: 20px; }
        .detail-list { display: flex; flex-direction: column; gap: 12px; }
        .detail-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 15px;
            color: var(--color-text-soft);
        }
        .detail-list li i { color: var(--color-secondary); font-size: 18px; margin-top: 2px; flex-shrink: 0; }
        @media (max-width: 768px) {
            .detail-grid { grid-template-columns: 1fr; gap: 32px; }
            .detail-img img { height: 240px; }
            .detail-content h2 { font-size: 26px; }
            .detail-grid.reverse { direction: ltr; }
        }
        .detail-grid.reverse .detail-img { order: 2; }
        .detail-grid.reverse .detail-content { order: 1; }

        /* ===== 分类入口 ===== */
        .category-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
        .category-card {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            aspect-ratio: 16 / 9;
            display: flex;
            align-items: flex-end;
            padding: 24px;
            color: var(--color-white);
            transition: all var(--transition);
            background-size: cover;
            background-position: center;
        }
        .category-card::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.1) 100%);
            transition: opacity var(--transition);
        }
        .category-card:hover::before { opacity: 0.85; }
        .category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
        .category-card-content { position: relative; z-index: 2; }
        .category-card-content h3 { font-size: 22px; font-weight: 700; color: var(--color-white); margin-bottom: 4px; }
        .category-card-content p { font-size: 14px; opacity: 0.85; }
        .category-card .tag {
            position: absolute;
            top: 16px;
            right: 16px;
            z-index: 2;
            background: rgba(255,255,255,0.2);
            backdrop-filter: blur(6px);
            padding: 4px 12px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            color: var(--color-white);
        }

        /* ===== 资讯列表（CMS） ===== */
        .post-list { display: flex; flex-direction: column; gap: 20px; }
        .post-item {
            display: flex;
            gap: 20px;
            background: var(--color-white);
            border-radius: var(--radius-md);
            padding: 20px;
            border: 1px solid var(--color-border);
            transition: all var(--transition);
            align-items: flex-start;
        }
        .post-item:hover { box-shadow: var(--shadow-md); border-color: transparent; transform: translateY(-2px); }
        .post-thumb {
            width: 180px;
            min-height: 120px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--color-bg-alt);
        }
        .post-thumb img { width: 100%; height: 100%; object-fit: cover; }
        .post-body { flex: 1; min-width: 0; }
        .post-body .badge { margin-bottom: 8px; }
        .post-body h3 { font-size: 19px; font-weight: 700; margin-bottom: 6px; line-height: 1.4; }
        .post-body h3 a { color: var(--color-text); }
        .post-body h3 a:hover { color: var(--color-primary); }
        .post-body p { color: var(--color-text-soft); font-size: 14px; line-height: 1.7; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .post-meta { display: flex; gap: 16px; margin-top: 10px; font-size: 13px; color: var(--color-text-light); }
        .post-meta i { margin-right: 4px; }
        .post-empty {
            text-align: center;
            padding: 48px 24px;
            color: var(--color-text-soft);
            background: var(--color-white);
            border-radius: var(--radius-md);
            border: 1px dashed var(--color-border);
        }
        .post-empty i { font-size: 48px; color: var(--color-text-light); margin-bottom: 16px; display: block; }
        @media (max-width: 768px) {
            .post-item { flex-direction: column; }
            .post-thumb { width: 100%; height: 180px; }
        }

        /* ===== 流程步骤 ===== */
        .steps { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 32px; counter-reset: step; }
        .step-card {
            text-align: center;
            padding: 32px 20px;
            background: var(--color-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            position: relative;
            transition: all var(--transition);
        }
        .step-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
        .step-num {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--color-primary);
            color: var(--color-white);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 800;
            margin: 0 auto 16px;
        }
        .step-card h3 { font-size: 20px; margin-bottom: 8px; }
        .step-card p { color: var(--color-text-soft); font-size: 15px; line-height: 1.7; }
        @media (max-width: 768px) {
            .steps { grid-template-columns: 1fr; gap: 20px; }
        }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--color-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover { box-shadow: var(--shadow-sm); }
        .faq-question {
            width: 100%;
            padding: 20px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 17px;
            font-weight: 600;
            color: var(--color-text);
            text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover { background: var(--color-bg-alt); }
        .faq-question i { font-size: 18px; color: var(--color-text-light); transition: transform var(--transition); }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--color-text-soft);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-question:focus-visible { outline: 3px solid var(--color-primary-light); outline-offset: -3px; }

        /* ===== CTA ===== */
        .cta {
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
            border-radius: var(--radius-lg);
            padding: 64px 48px;
            text-align: center;
            color: var(--color-white);
            position: relative;
            overflow: hidden;
        }
        .cta::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }
        .cta h2 { font-size: 36px; color: var(--color-white); margin-bottom: 12px; }
        .cta p { font-size: 18px; opacity: 0.9; margin-bottom: 28px; max-width: 560px; margin-left: auto; margin-right: auto; }
        .cta .btn-white { font-size: 17px; padding: 16px 36px; }
        .cta .btn-white:hover { background: var(--color-white); color: var(--color-primary-dark); }
        @media (max-width: 768px) {
            .cta { padding: 40px 24px; }
            .cta h2 { font-size: 28px; }
            .cta p { font-size: 16px; }
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--color-bg-dark);
            color: rgba(255,255,255,0.7);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            margin-bottom: 24px;
        }
        .footer-brand h3 {
            font-size: 22px;
            font-weight: 800;
            color: var(--color-white);
            margin-bottom: 12px;
        }
        .footer-brand p { font-size: 14px; line-height: 1.8; max-width: 360px; }
        .footer-col h4 { color: var(--color-white); font-size: 16px; font-weight: 600; margin-bottom: 16px; }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.6);
            font-size: 14px;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover { color: var(--color-primary-light); }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--color-primary-light); }
        .footer-social { display: flex; gap: 12px; }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255,255,255,0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255,255,255,0.6);
            transition: all var(--transition);
        }
        .footer-social a:hover { background: var(--color-primary); color: var(--color-white); }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== 辅助 ===== */
        .bg-alt { background: var(--color-bg-alt); }
        .bg-white { background: var(--color-white); }
        .divider {
            width: 60px;
            height: 4px;
            border-radius: 2px;
            background: var(--color-primary);
            margin: 0 auto 24px;
        }
        .divider-left { margin: 0 0 24px 0; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

        /* ===== 滚动加载动画 ===== */
        .fade-up { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
        .fade-up.visible { opacity: 1; transform: translateY(0); }

        /* ===== 移动端菜单覆盖 ===== */
        @media (max-width: 768px) {
            .header-inner { padding: 0 16px; }
        }

/* roulang page: article */
/* ===== Design Variables ===== */
:root {
  --primary: #6c5ce7;
  --primary-dark: #5a4bd1;
  --primary-light: #a29bfe;
  --secondary: #fd79a8;
  --accent: #fdcb6e;
  --bg-body: #f8f9fa;
  --bg-card: #ffffff;
  --bg-dark: #2d3436;
  --bg-soft: #eef1f5;
  --text-primary: #2d3436;
  --text-secondary: #636e72;
  --text-light: #b2bec3;
  --text-white: #ffffff;
  --border: #dfe6e9;
  --border-light: #f0f0f0;
  --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 16px 48px rgba(0,0,0,0.10);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
  --font-sans: 'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
  --max-width: 1200px;
  --header-h: 72px;
}

/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:var(--font-sans);font-size:16px;line-height:1.7;color:var(--text-primary);background:var(--bg-body);-webkit-font-smoothing:antialiased;}
a{color:var(--primary);text-decoration:none;transition:color var(--transition);}
a:hover{color:var(--primary-dark);}
a:focus-visible{outline:3px solid var(--primary-light);outline-offset:2px;border-radius:4px;}
img{max-width:100%;height:auto;display:block;}
button,input,textarea,select{font-family:inherit;font-size:inherit;outline: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:2.4rem;}h2{font-size:1.8rem;}h3{font-size:1.35rem;}h4{font-size:1.1rem;}
p{margin-bottom:0.8rem;color:var(--text-secondary);}
.container{max-width:var(--max-width);margin:0 auto;padding:0 24px;}
@media(max-width:640px){.container{padding:0 16px;}}

/* ===== Header / Nav ===== */
.header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(255,255,255,0.88);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border);height:var(--header-h);display:flex;align-items:center;transition:box-shadow var(--transition);}
.header.scrolled{box-shadow:var(--shadow-sm);}
.header .container{display:flex;align-items:center;justify-content:space-between;width:100%;}
.header-logo{display:flex;align-items:center;gap:10px;font-size:1.35rem;font-weight:800;color:var(--primary);letter-spacing:-0.3px;}
.header-logo i{font-size:1.5rem;color:var(--secondary);}
.header-logo span{background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}
.header-nav{display:flex;align-items:center;gap:6px;}
.header-nav a{position:relative;padding:8px 18px;border-radius:var(--radius-sm);font-size:0.95rem;font-weight:500;color:var(--text-secondary);transition:all var(--transition);}
.header-nav a:hover{color:var(--primary);background:rgba(108,92,231,0.08);}
.header-nav a.active{color:var(--text-white);background:var(--primary);box-shadow:0 4px 12px rgba(108,92,231,0.30);}
.header-nav a.active::after{display:none;}
.mobile-toggle{display:none;background:none;border:none;font-size:1.6rem;color:var(--text-primary);cursor:pointer;padding:4px 8px;border-radius:var(--radius-sm);transition:background var(--transition);}
.mobile-toggle:hover{background:var(--bg-soft);}
@media(max-width:768px){
  .mobile-toggle{display:block;}
  .header-nav{position:fixed;top:var(--header-h);left:0;right:0;background:rgba(255,255,255,0.98);backdrop-filter:blur(16px);flex-direction:column;padding:16px 24px 24px;gap:4px;border-bottom:1px solid var(--border);box-shadow:var(--shadow-md);transform:translateY(-120%);opacity:0;pointer-events:none;transition:all 0.35s ease;border-radius:0 0 var(--radius-md) var(--radius-md);}
  .header-nav.open{transform:translateY(0);opacity:1;pointer-events:auto;}
  .header-nav a{width:100%;padding:12px 16px;border-radius:var(--radius-sm);font-size:1rem;}
  .header-nav a.active{background:var(--primary);color:var(--text-white);}
}

/* ===== Article Hero ===== */
.article-hero{position:relative;margin-top:var(--header-h);padding:60px 0 40px;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 60%,#2d3436 100%);overflow:hidden;}
.article-hero::before{content:'';position:absolute;inset:0;background:url('/assets/images/backpic/back-2.png') center/cover no-repeat;opacity:0.20;mix-blend-mode:overlay;}
.article-hero .container{position:relative;z-index:2;text-align:center;}
.article-hero .article-meta{display:flex;flex-wrap:wrap;justify-content:center;gap:12px 24px;margin-bottom:16px;font-size:0.9rem;color:rgba(255,255,255,0.8);}
.article-hero .article-meta span{display:inline-flex;align-items:center;gap:6px;}
.article-hero .article-meta i{font-size:0.85rem;}
.article-hero .article-category{display:inline-block;padding:4px 16px;border-radius:50px;background:rgba(255,255,255,0.18);color:var(--text-white);font-size:0.8rem;font-weight:600;letter-spacing:0.5px;backdrop-filter:blur(4px);margin-bottom:12px;}
.article-hero h1{font-size:2.2rem;color:var(--text-white);max-width:860px;margin:0 auto;line-height:1.35;text-shadow:0 2px 12px rgba(0,0,0,0.15);}
@media(max-width:768px){
  .article-hero{padding:40px 0 30px;}
  .article-hero h1{font-size:1.5rem;}
  .article-hero .article-meta{gap:8px 16px;font-size:0.8rem;}
}

/* ===== Article Main ===== */
.article-main{padding:48px 0 64px;}
.article-layout{display:grid;grid-template-columns:1fr 320px;gap:40px;}
.article-body{background:var(--bg-card);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);padding:40px 44px;transition:box-shadow var(--transition);}
.article-body:hover{box-shadow:var(--shadow-md);}
.article-body .content{font-size:1.05rem;line-height:1.85;color:var(--text-primary);}
.article-body .content p{margin-bottom:1.2rem;}
.article-body .content h2,.article-body .content h3,.article-body .content h4{margin-top:2rem;margin-bottom:0.8rem;color:var(--text-primary);}
.article-body .content ul,.article-body .content ol{padding-left:1.5rem;margin-bottom:1.2rem;color:var(--text-secondary);}
.article-body .content ul li{list-style:disc;margin-bottom:0.4rem;}
.article-body .content ol li{list-style:decimal;margin-bottom:0.4rem;}
.article-body .content img{border-radius:var(--radius-sm);margin:1.5rem auto;box-shadow:var(--shadow-sm);}
.article-body .content blockquote{border-left:4px solid var(--primary);padding:12px 20px;margin:1.5rem 0;background:var(--bg-soft);border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--text-secondary);font-style:italic;}
.article-body .content a{color:var(--primary);font-weight:600;border-bottom:1px dashed var(--primary-light);}
.article-body .content a:hover{border-bottom-style:solid;color:var(--primary-dark);}
.article-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border);}
.article-tags .tag{padding:4px 14px;border-radius:50px;background:var(--bg-soft);color:var(--text-secondary);font-size:0.85rem;font-weight:500;transition:all var(--transition);}
.article-tags .tag:hover{background:var(--primary);color:var(--text-white);}
.article-nav{margin-top:36px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;}
.article-nav a{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:var(--radius-sm);border:1px solid var(--border);color:var(--text-secondary);font-size:0.95rem;font-weight:500;transition:all var(--transition);}
.article-nav a:hover{border-color:var(--primary);color:var(--primary);background:rgba(108,92,231,0.04);box-shadow:var(--shadow-sm);}

/* ===== Sidebar ===== */
.article-sidebar{display:flex;flex-direction:column;gap:28px;}
.sidebar-card{background:var(--bg-card);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);padding:24px 20px;transition:box-shadow var(--transition);}
.sidebar-card:hover{box-shadow:var(--shadow-md);}
.sidebar-card h3{font-size:1.05rem;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--bg-soft);color:var(--text-primary);display:flex;align-items:center;gap:8px;}
.sidebar-card h3 i{color:var(--primary);}
.sidebar-list{display:flex;flex-direction:column;gap:10px;}
.sidebar-list a{display:flex;align-items:flex-start;gap:12px;padding:10px 12px;border-radius:var(--radius-sm);background:var(--bg-body);transition:all var(--transition);}
.sidebar-list a:hover{background:var(--bg-soft);transform:translateX(4px);}
.sidebar-list a .num{flex-shrink:0;width:26px;height:26px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:var(--primary);color:var(--text-white);font-size:0.75rem;font-weight:700;}
.sidebar-list a .num.top{background:var(--secondary);}
.sidebar-list a .text{flex:1;font-size:0.9rem;color:var(--text-primary);font-weight:500;line-height:1.4;}
.sidebar-list a .text small{display:block;font-size:0.75rem;color:var(--text-light);font-weight:400;margin-top:2px;}
.sidebar-cta{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:var(--text-white);text-align:center;padding:28px 20px;}
.sidebar-cta h3{color:var(--text-white);border-bottom-color:rgba(255,255,255,0.15);}
.sidebar-cta p{color:rgba(255,255,255,0.85);font-size:0.9rem;margin-bottom:16px;}
.sidebar-cta .btn-cta{display:inline-block;padding:10px 28px;border-radius:50px;background:var(--text-white);color:var(--primary);font-weight:700;font-size:0.95rem;transition:all var(--transition);}
.sidebar-cta .btn-cta:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,0.20);color:var(--primary-dark);}

/* ===== Not Found ===== */
.not-found-wrap{text-align:center;padding:80px 24px;}
.not-found-wrap i{font-size:3.6rem;color:var(--text-light);margin-bottom:20px;}
.not-found-wrap h2{font-size:1.6rem;margin-bottom:12px;}
.not-found-wrap p{color:var(--text-secondary);margin-bottom:24px;}
.not-found-wrap .btn-back{display:inline-block;padding:12px 36px;border-radius:50px;background:var(--primary);color:var(--text-white);font-weight:600;transition:all var(--transition);}
.not-found-wrap .btn-back:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:var(--shadow-md);}

/* ===== Related Posts ===== */
.related-section{background:var(--bg-soft);padding:48px 0;}
.related-section h2{text-align:center;margin-bottom:32px;font-size:1.5rem;}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.related-card{background:var(--bg-card);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm);transition:all var(--transition);}
.related-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);}
.related-card .card-img{width:100%;height:180px;object-fit:cover;}
.related-card .card-body{padding:18px 20px 20px;}
.related-card .card-body h4{font-size:1rem;margin-bottom:6px;line-height:1.4;}
.related-card .card-body h4 a{color:var(--text-primary);}
.related-card .card-body h4 a:hover{color:var(--primary);}
.related-card .card-body .meta{font-size:0.8rem;color:var(--text-light);display:flex;gap:12px;}

/* ===== Footer ===== */
.footer{background:var(--bg-dark);color:rgba(255,255,255,0.75);padding:48px 0 0;}
.footer .container{max-width:var(--max-width);margin:0 auto;padding:0 24px;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:36px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,0.08);}
.footer-brand h3{font-size:1.3rem;color:var(--text-white);margin-bottom:12px;}
.footer-brand h3 i{color:var(--secondary);}
.footer-brand p{font-size:0.9rem;line-height:1.7;color:rgba(255,255,255,0.6);max-width:360px;}
.footer-social a{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,0.08);color:rgba(255,255,255,0.7);font-size:1.1rem;margin-right:8px;transition:all var(--transition);}
.footer-social a:hover{background:var(--primary);color:var(--text-white);transform:translateY(-2px);}
.footer-col h4{font-size:0.95rem;color:var(--text-white);margin-bottom:14px;font-weight:600;}
.footer-col a{display:block;padding:5px 0;font-size:0.88rem;color:rgba(255,255,255,0.55);transition:all var(--transition);}
.footer-col a:hover{color:var(--primary-light);padding-left:4px;}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding:20px 0;flex-wrap:wrap;gap:8px;font-size:0.82rem;color:rgba(255,255,255,0.4);}
.footer-bottom a{color:rgba(255,255,255,0.5);}
.footer-bottom a:hover{color:var(--primary-light);}
@media(max-width:768px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px;}
  .footer-brand{grid-column:1/-1;}
}
@media(max-width:520px){
  .footer-grid{grid-template-columns:1fr;gap:24px;}
  .footer-bottom{flex-direction:column;text-align:center;}
}

/* ===== Responsive Article ===== */
@media(max-width:1024px){
  .article-layout{grid-template-columns:1fr 280px;gap:28px;}
  .article-body{padding:32px 28px;}
}
@media(max-width:768px){
  .article-layout{grid-template-columns:1fr;gap:28px;}
  .article-body{padding:24px 20px;}
  .related-grid{grid-template-columns:1fr 1fr;}
}
@media(max-width:520px){
  .article-hero h1{font-size:1.3rem;}
  .article-body{padding:18px 14px;}
  .article-body .content{font-size:0.98rem;}
  .related-grid{grid-template-columns:1fr;}
  .article-nav{flex-direction:column;align-items:stretch;}
}

/* ===== Utility ===== */
.text-center{text-align:center;}
.mt-16{margin-top:16px;}
.mb-16{margin-bottom:16px;}
.gap-8{gap:8px;}

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --accent-light: #fbbf24;
            --bg-body: #f0f2f5;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --bg-dark-alt: #1e293b;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-white: #f8fafc;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --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 12px 40px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-h);
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            transition: var(--transition);
        }
        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);
        }

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

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-h);
            background: rgba(15, 23, 42, 0.97);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: 0.5px;
            flex-shrink: 0;
        }
        .header-logo i {
            color: var(--accent);
            font-size: 1.5rem;
        }
        .header-logo span {
            background: linear-gradient(135deg, #f8fafc 0%, #94a3b8 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .header-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .header-nav a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.92rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.7);
            transition: var(--transition);
            position: relative;
        }
        .header-nav a:hover {
            color: var(--text-white);
            background: rgba(255, 255, 255, 0.08);
        }
        .header-nav a.active {
            color: var(--text-white);
            background: rgba(37, 99, 235, 0.25);
        }
        .header-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 3px;
            background: var(--accent);
            border-radius: 2px;
        }
        .header-nav a i {
            font-size: 0.85rem;
            opacity: 0.7;
        }

        /* Hamburger */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            background: none;
            border: none;
            cursor: pointer;
        }
        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-white);
            border-radius: 3px;
            transition: var(--transition);
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }
            .header-nav {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(15, 23, 42, 0.98);
                backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                box-shadow: var(--shadow-lg);
            }
            .header-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .header-nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
                border-radius: var(--radius-sm);
            }
            .header-nav a.active::after {
                display: none;
            }
            .header-nav a.active {
                background: rgba(37, 99, 235, 0.2);
                border-left: 3px solid var(--accent);
            }
        }
        @media (max-width: 520px) {
            .header-logo {
                font-size: 1.1rem;
            }
            .header-logo i {
                font-size: 1.2rem;
            }
        }

        /* ===== Hero / Banner ===== */
        .category-hero {
            position: relative;
            min-height: 320px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 41, 59, 0.85) 100%), url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            padding: 80px 24px 60px;
            overflow: hidden;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 40%, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
            pointer-events: none;
        }
        .category-hero * {
            position: relative;
            z-index: 1;
        }
        .category-hero h1 {
            font-size: 3rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 12px;
            letter-spacing: 1px;
            text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }
        .category-hero h1 i {
            color: var(--accent);
            margin-right: 10px;
        }
        .category-hero p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 620px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }
        .category-hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(6px);
            padding: 8px 20px;
            border-radius: 50px;
            font-size: 0.85rem;
            color: var(--accent-light);
            border: 1px solid rgba(255, 255, 255, 0.1);
            margin-bottom: 20px;
        }
        .category-hero .hero-badge i {
            font-size: 0.8rem;
        }
        @media (max-width: 768px) {
            .category-hero {
                min-height: 240px;
                padding: 60px 16px 40px;
            }
            .category-hero h1 {
                font-size: 2rem;
            }
            .category-hero p {
                font-size: 1rem;
            }
        }
        @media (max-width: 520px) {
            .category-hero h1 {
                font-size: 1.6rem;
            }
            .category-hero p {
                font-size: 0.92rem;
            }
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            padding: 16px 0 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-muted);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb span {
            color: var(--text-secondary);
        }
        .breadcrumb i {
            font-size: 0.65rem;
            color: var(--text-muted);
        }

        /* ===== Section通用 ===== */
        .section {
            padding: 72px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 2.1rem;
            font-weight: 700;
            margin-bottom: 12px;
            position: relative;
            display: inline-block;
        }
        .section-title h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 4px;
            margin: 12px auto 0;
        }
        .section-title p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .section-title h2 {
                font-size: 1.6rem;
            }
            .section-title p {
                font-size: 0.95rem;
            }
            .section-title {
                margin-bottom: 32px;
            }
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 28px;
        }
        .card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .card-img {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 10;
            background: var(--bg-dark-alt);
        }
        .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .card:hover .card-img img {
            transform: scale(1.05);
        }
        .card-img .card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--accent);
            color: #0f172a;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 14px;
            border-radius: 50px;
            letter-spacing: 0.3px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
        }
        .card-body {
            padding: 20px 22px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-body .card-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 8px;
        }
        .card-body .card-meta i {
            margin-right: 4px;
        }
        .card-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
            line-height: 1.4;
        }
        .card-body h3 a {
            color: inherit;
        }
        .card-body h3 a:hover {
            color: var(--primary);
        }
        .card-body p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
            margin-bottom: 16px;
        }
        .card-body .card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }
        .card-body .card-footer .btn-text {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .card-body .card-footer .btn-text:hover {
            color: var(--primary-dark);
            gap: 10px;
        }
        .card-body .card-footer .date {
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        @media (max-width: 520px) {
            .card-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .card-body {
                padding: 16px 18px 20px;
            }
            .card-body h3 {
                font-size: 1rem;
            }
        }

        /* ===== 特色亮点 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 28px;
        }
        .feature-item {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .feature-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }
        .feature-item .icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 18px;
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(245, 158, 11, 0.08));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--primary);
            transition: var(--transition);
        }
        .feature-item:hover .icon {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            transform: scale(1.05);
        }
        .feature-item h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .feature-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .feature-item {
                padding: 24px 16px;
            }
            .feature-item .icon {
                width: 52px;
                height: 52px;
                font-size: 1.3rem;
            }
            .feature-item h4 {
                font-size: 0.95rem;
            }
        }

        /* ===== 数据统计 ===== */
        .stats-section {
            background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-dark-alt) 100%);
            padding: 72px 0;
        }
        .stats-section .section-title h2 {
            color: var(--text-white);
        }
        .stats-section .section-title h2::after {
            background: linear-gradient(90deg, var(--accent), var(--accent-light));
        }
        .stats-section .section-title p {
            color: rgba(255, 255, 255, 0.65);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 28px;
            text-align: center;
        }
        .stat-item {
            padding: 32px 16px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.06);
            backdrop-filter: blur(4px);
            transition: var(--transition);
        }
        .stat-item:hover {
            background: rgba(255, 255, 255, 0.08);
            transform: translateY(-3px);
        }
        .stat-item .num {
            font-size: 2.8rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--accent-light), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }
        .stat-item .label {
            font-size: 0.92rem;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 6px;
        }
        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-item .num {
                font-size: 2rem;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-md);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            gap: 16px;
        }
        .faq-question i {
            font-size: 0.85rem;
            color: var(--primary);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
            display: none;
        }
        .faq-answer.open {
            display: block;
        }
        .faq-answer p {
            margin-bottom: 8px;
        }
        .faq-answer p:last-child {
            margin-bottom: 0;
        }
        @media (max-width: 520px) {
            .faq-question {
                padding: 14px 16px;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 16px 14px;
                font-size: 0.88rem;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.06), rgba(245, 158, 11, 0.06));
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .cta-box {
            background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-dark-alt) 100%);
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
            box-shadow: var(--shadow-xl);
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 70% 30%, rgba(37, 99, 235, 0.15), transparent 70%);
            pointer-events: none;
        }
        .cta-box * {
            position: relative;
            z-index: 1;
        }
        .cta-box h2 {
            font-size: 2rem;
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .cta-box p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-box .btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 34px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 28px rgba(37, 99, 235, 0.4);
            color: #fff;
        }
        .btn-outline-light {
            background: transparent;
            color: var(--text-white);
            border: 2px solid rgba(255, 255, 255, 0.25);
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: var(--text-white);
            color: var(--text-white);
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .cta-box {
                padding: 40px 24px;
            }
            .cta-box h2 {
                font-size: 1.5rem;
            }
            .cta-box p {
                font-size: 0.95rem;
            }
            .btn {
                padding: 12px 26px;
                font-size: 0.9rem;
            }
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-brand h3 {
            font-size: 1.3rem;
            color: var(--text-white);
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-brand h3 i {
            color: var(--accent);
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            max-width: 320px;
        }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            color: rgba(255, 255, 255, 0.6);
            font-size: 1.1rem;
            transition: var(--transition);
            margin-right: 8px;
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 18px;
            letter-spacing: 0.3px;
        }
        .footer-col a {
            display: block;
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.55);
            padding: 5px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent-light);
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
            gap: 12px;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: var(--accent-light);
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

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

        /* ===== 分割线 ===== */
        .divider {
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 4px;
            margin: 16px auto 24px;
        }

        /* ===== 分类筛选标签 ===== */
        .filter-tabs {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-bottom: 36px;
        }
        .filter-tabs .tab {
            padding: 8px 22px;
            border-radius: 50px;
            font-size: 0.88rem;
            font-weight: 500;
            background: var(--bg-white);
            color: var(--text-secondary);
            border: 1px solid var(--border);
            cursor: pointer;
            transition: var(--transition);
        }
        .filter-tabs .tab:hover {
            border-color: var(--primary-light);
            color: var(--primary);
        }
        .filter-tabs .tab.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
        }
        @media (max-width: 520px) {
            .filter-tabs .tab {
                padding: 6px 16px;
                font-size: 0.82rem;
            }
        }

        /* ===== 加载更多 ===== */
        .load-more {
            text-align: center;
            margin-top: 40px;
        }
        .load-more .btn {
            padding: 12px 40px;
        }

        /* ===== 文章内页通用 ===== */
        .article-hero {
            min-height: 240px;
        }
        .article-content {
            max-width: 800px;
            margin: 0 auto;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 40px 48px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }
        .article-content h2 {
            font-size: 1.6rem;
            margin: 32px 0 16px;
        }
        .article-content p {
            margin-bottom: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        @media (max-width: 768px) {
            .article-content {
                padding: 24px 20px;
            }
            .article-content h2 {
                font-size: 1.3rem;
            }
        }

        /* ===== 回到顶部 ===== */
        .back-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: var(--shadow-lg);
            z-index: 999;
            opacity: 0;
            transform: translateY(20px);
            pointer-events: none;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .back-top.show {
            opacity: 1;
            transform: translateY(0);
            pointer-events: all;
        }
        .back-top:hover {
            background: var(--primary-dark);
            transform: translateY(-4px);
            box-shadow: var(--shadow-xl);
        }
        @media (max-width: 520px) {
            .back-top {
                bottom: 20px;
                right: 20px;
                width: 42px;
                height: 42px;
                font-size: 1rem;
            }
        }