/* roulang page: index */
/* ===== 设计变量 ===== */
    :root {
        --primary: #1a3a5c;
        --primary-light: #2d6a9f;
        --primary-dark: #0d1f33;
        --accent: #f5a623;
        --accent-light: #f8c65e;
        --accent-dark: #d48f1a;
        --bg-light: #f8f9fa;
        --bg-white: #ffffff;
        --bg-dark: #0d1f33;
        --text-primary: #1a1a2e;
        --text-secondary: #4a4a6a;
        --text-muted: #8a8aaa;
        --text-white: #f0f0f5;
        --border: #e2e6ef;
        --border-light: #f0f2f5;
        --radius-sm: 6px;
        --radius-md: 12px;
        --radius-lg: 20px;
        --radius-xl: 28px;
        --shadow-sm: 0 2px 8px rgba(26, 58, 92, 0.06);
        --shadow-md: 0 6px 24px rgba(26, 58, 92, 0.10);
        --shadow-lg: 0 16px 48px rgba(26, 58, 92, 0.14);
        --shadow-accent: 0 6px 24px rgba(245, 166, 35, 0.25);
        --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
        --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        --max-width: 1200px;
        --header-top-height: 40px;
        --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-family);
        font-size: 16px;
        line-height: 1.7;
        color: var(--text-primary);
        background: var(--bg-light);
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    a { color: inherit; text-decoration: none; transition: var(--transition); }
    a:hover { color: var(--primary-light); }
    a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
    img { max-width: 100%; height: auto; display: block; }
    button, input, textarea { font-family: inherit; font-size: inherit; border: none; outline: none; transition: var(--transition); }
    button { cursor: pointer; background: none; }
    button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
    .container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
    .section { padding: 80px 0; }
    .section-title { text-align: center; margin-bottom: 56px; }
    .section-title h2 { font-size: 2rem; letter-spacing: -0.5px; position: relative; display: inline-block; }
    .section-title h2::after { content: ''; display: block; width: 48px; height: 4px; background: var(--accent); border-radius: 4px; margin: 12px auto 0; }
    .section-title p { color: var(--text-secondary); font-size: 1.05rem; margin-top: 12px; max-width: 600px; margin-left: auto; margin-right: auto; }
    .text-accent { color: var(--accent); }
    .text-muted { color: var(--text-muted); }

    /* ===== 顶部信息条 ===== */
    .header-top {
        background: var(--primary-dark);
        color: var(--text-white);
        font-size: 0.8rem;
        height: var(--header-top-height);
        display: flex;
        align-items: center;
        border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .header-top .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
    .header-top a { color: var(--accent-light); opacity: 0.85; }
    .header-top a:hover { opacity: 1; color: var(--accent); }
    .header-top-left span { opacity: 0.7; margin-right: 20px; }
    .header-top-right { display: flex; align-items: center; gap: 16px; }
    .header-top-right .domain-badge { background: rgba(245,166,35,0.15); padding: 2px 12px; border-radius: 20px; color: var(--accent-light); font-size: 0.75rem; }

    /* ===== 主导航 ===== */
    .main-nav {
        background: var(--bg-white);
        height: var(--nav-height);
        border-bottom: 1px solid var(--border-light);
        position: sticky; top: 0; z-index: 100;
        box-shadow: var(--shadow-sm);
    }
    .main-nav .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
    .nav-logo { display: flex; align-items: center; gap: 10px; font-size: 1.35rem; font-weight: 800; color: var(--primary); letter-spacing: -0.3px; }
    .nav-logo .logo-icon { width: 36px; height: 36px; background: linear-gradient(135deg, var(--primary), var(--primary-light)); border-radius: 10px; display: flex; align-items: center; justify-content: center; color: white; font-size: 1.2rem; font-weight: 700; flex-shrink: 0; }
    .nav-links { display: flex; align-items: center; gap: 8px; }
    .nav-links a {
        padding: 8px 18px;
        border-radius: var(--radius-sm);
        font-size: 0.95rem;
        font-weight: 500;
        color: var(--text-secondary);
        position: relative;
        transition: var(--transition);
    }
    .nav-links a:hover { color: var(--primary); background: rgba(26,58,92,0.04); }
    .nav-links a.active { color: var(--primary); background: rgba(26,58,92,0.06); font-weight: 600; }
    .nav-links a.active::after { content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%); width: 20px; height: 3px; background: var(--accent); border-radius: 4px; }
    .nav-cta {
        background: linear-gradient(135deg, var(--accent), var(--accent-dark));
        color: white !important;
        padding: 10px 24px !important;
        border-radius: var(--radius-md) !important;
        font-weight: 600 !important;
        box-shadow: var(--shadow-accent);
    }
    .nav-cta:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(245,166,35,0.35); color: white !important; background: linear-gradient(135deg, var(--accent-light), var(--accent)); }
    .nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; cursor: pointer; background: none; border: none; }
    .nav-toggle span { display: block; width: 24px; height: 2.5px; background: var(--text-primary); border-radius: 4px; transition: var(--transition); }

    /* ===== Hero ===== */
    .hero {
        position: relative;
        min-height: 620px;
        display: flex;
        align-items: center;
        background: var(--primary-dark);
        overflow: hidden;
    }
    .hero-bg {
        position: absolute; inset: 0;
        background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
        opacity: 0.25;
        mix-blend-mode: overlay;
    }
    .hero-overlay {
        position: absolute; inset: 0;
        background: linear-gradient(135deg, rgba(13,31,51,0.88) 0%, rgba(26,58,92,0.72) 50%, rgba(13,31,51,0.88) 100%);
    }
    .hero .container { position: relative; z-index: 2; width: 100%; text-align: center; padding: 80px 24px; }
    .hero-badge {
        display: inline-block;
        background: rgba(245,166,35,0.15);
        color: var(--accent-light);
        padding: 6px 20px;
        border-radius: 40px;
        font-size: 0.85rem;
        font-weight: 500;
        letter-spacing: 0.5px;
        margin-bottom: 24px;
        border: 1px solid rgba(245,166,35,0.2);
    }
    .hero h1 {
        font-size: 3.2rem;
        font-weight: 800;
        color: var(--text-white);
        letter-spacing: -1px;
        line-height: 1.2;
        margin-bottom: 20px;
    }
    .hero h1 span { color: var(--accent); }
    .hero p {
        font-size: 1.2rem;
        color: rgba(255,255,255,0.7);
        max-width: 640px;
        margin: 0 auto 36px;
        line-height: 1.8;
    }
    .hero-actions { display: flex; align-items: center; justify-content: center; gap: 16px; flex-wrap: wrap; }
    .btn-primary {
        display: inline-flex; align-items: center; gap: 8px;
        background: linear-gradient(135deg, var(--accent), var(--accent-dark));
        color: white;
        padding: 14px 36px;
        border-radius: var(--radius-md);
        font-weight: 600;
        font-size: 1rem;
        box-shadow: var(--shadow-accent);
        transition: var(--transition);
    }
    .btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 36px rgba(245,166,35,0.35); color: white; }
    .btn-secondary {
        display: inline-flex; align-items: center; gap: 8px;
        background: rgba(255,255,255,0.08);
        color: var(--text-white);
        padding: 14px 36px;
        border-radius: var(--radius-md);
        font-weight: 500;
        border: 1px solid rgba(255,255,255,0.15);
        backdrop-filter: blur(4px);
        transition: var(--transition);
    }
    .btn-secondary:hover { background: rgba(255,255,255,0.15); border-color: var(--accent); color: var(--accent-light); }

    /* ===== 核心优势 ===== */
    .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .feature-card {
        background: var(--bg-white);
        border-radius: var(--radius-lg);
        padding: 36px 28px;
        box-shadow: var(--shadow-sm);
        border: 1px solid var(--border-light);
        transition: var(--transition);
        text-align: center;
    }
    .feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: var(--accent); }
    .feature-icon { width: 64px; height: 64px; margin: 0 auto 20px; background: linear-gradient(135deg, rgba(26,58,92,0.06), rgba(45,106,159,0.10)); border-radius: 16px; display: flex; align-items: center; justify-content: center; font-size: 1.8rem; }
    .feature-card h3 { font-size: 1.2rem; margin-bottom: 12px; }
    .feature-card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; }

    /* ===== 分类入口 ===== */
    .category-section { background: var(--bg-white); }
    .category-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .category-card {
        display: flex; align-items: center; gap: 24px;
        background: var(--bg-light);
        border-radius: var(--radius-lg);
        padding: 28px 32px;
        border: 1px solid var(--border-light);
        transition: var(--transition);
        cursor: pointer;
    }
    .category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--accent); }
    .category-card .cat-img { width: 90px; height: 90px; border-radius: var(--radius-md); object-fit: cover; flex-shrink: 0; background: var(--border); }
    .category-card .cat-info h3 { font-size: 1.15rem; margin-bottom: 6px; }
    .category-card .cat-info p { color: var(--text-secondary); font-size: 0.9rem; }
    .category-card .cat-tag { display: inline-block; margin-top: 10px; background: var(--primary); color: white; padding: 2px 14px; border-radius: 20px; font-size: 0.75rem; }

    /* ===== 最新资讯 ===== */
    .news-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .news-card {
        background: var(--bg-white);
        border-radius: var(--radius-lg);
        overflow: hidden;
        box-shadow: var(--shadow-sm);
        border: 1px solid var(--border-light);
        transition: var(--transition);
        display: flex; flex-direction: column;
    }
    .news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
    .news-card .news-img { width: 100%; height: 200px; object-fit: cover; background: var(--border); }
    .news-card .news-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
    .news-card .news-cat { display: inline-block; background: rgba(26,58,92,0.08); color: var(--primary); padding: 2px 14px; border-radius: 20px; font-size: 0.75rem; font-weight: 500; margin-bottom: 10px; width: fit-content; }
    .news-card .news-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
    .news-card .news-title a { color: var(--text-primary); }
    .news-card .news-title a:hover { color: var(--primary-light); }
    .news-card .news-excerpt { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; flex: 1; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
    .news-card .news-meta { display: flex; align-items: center; justify-content: space-between; margin-top: 16px; font-size: 0.8rem; color: var(--text-muted); border-top: 1px solid var(--border-light); padding-top: 14px; }
    .news-empty { grid-column: 1 / -1; text-align: center; padding: 48px 24px; color: var(--text-muted); background: var(--bg-white); border-radius: var(--radius-lg); border: 1px dashed var(--border); }

    /* ===== 数据统计 ===== */
    .stats-section { background: var(--primary-dark); 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; mix-blend-mode: overlay; }
    .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; position: relative; z-index: 1; }
    .stat-item { text-align: center; padding: 32px 16px; }
    .stat-number { font-size: 2.8rem; font-weight: 800; color: var(--accent); line-height: 1.1; margin-bottom: 8px; }
    .stat-label { color: rgba(255,255,255,0.7); font-size: 1rem; font-weight: 400; }
    .stat-divider { width: 1px; height: 80px; background: rgba(255,255,255,0.1); align-self: center; }

    /* ===== 使用流程 ===== */
    .flow-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; position: relative; }
    .flow-grid::before { content: ''; position: absolute; top: 40px; left: 12%; right: 12%; height: 2px; background: linear-gradient(to right, var(--accent), var(--primary-light), var(--accent)); opacity: 0.3; z-index: 0; }
    .flow-step { text-align: center; position: relative; z-index: 1; }
    .flow-step .step-num { width: 48px; height: 48px; margin: 0 auto 16px; background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: white; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; font-weight: 700; box-shadow: 0 6px 20px rgba(26,58,92,0.2); }
    .flow-step h4 { font-size: 1.05rem; margin-bottom: 8px; }
    .flow-step p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; max-width: 200px; margin: 0 auto; }

    /* ===== FAQ ===== */
    .faq-list { max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
    .faq-item { background: var(--bg-white); border-radius: var(--radius-md); border: 1px solid var(--border-light); overflow: hidden; transition: var(--transition); }
    .faq-item:hover { border-color: var(--accent); box-shadow: var(--shadow-sm); }
    .faq-question { padding: 20px 24px; display: flex; align-items: center; justify-content: space-between; font-weight: 600; font-size: 1rem; cursor: pointer; background: none; width: 100%; text-align: left; color: var(--text-primary); }
    .faq-question .faq-icon { font-size: 1.2rem; color: var(--accent); transition: var(--transition); }
    .faq-answer { padding: 0 24px 20px; color: var(--text-secondary); font-size: 0.95rem; line-height: 1.8; display: none; }
    .faq-item.active .faq-answer { display: block; }
    .faq-item.active .faq-icon { transform: rotate(45deg); }

    /* ===== CTA ===== */
    .cta-section {
        background: linear-gradient(135deg, var(--primary-dark), var(--primary));
        position: relative;
        overflow: hidden;
        text-align: center;
        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: 0.06; mix-blend-mode: overlay; }
    .cta-section .container { position: relative; z-index: 1; }
    .cta-section h2 { font-size: 2.2rem; color: var(--text-white); margin-bottom: 16px; }
    .cta-section p { color: rgba(255,255,255,0.65); font-size: 1.1rem; max-width: 540px; margin: 0 auto 32px; }
    .cta-section .btn-primary { font-size: 1.1rem; padding: 16px 48px; }

    /* ===== 页脚 ===== */
    .site-footer {
        background: var(--primary-dark);
        color: rgba(255,255,255,0.7);
        padding: 56px 0 0;
        border-top: 1px solid rgba(255,255,255,0.05);
    }
    .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 .footer-logo { font-size: 1.3rem; font-weight: 800; color: var(--text-white); margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
    .footer-brand .footer-logo .logo-icon { width: 32px; height: 32px; background: linear-gradient(135deg, var(--accent), var(--accent-dark)); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: white; font-weight: 700; font-size: 1rem; }
    .footer-brand p { font-size: 0.9rem; line-height: 1.8; max-width: 320px; }
    .footer-col h4 { color: var(--text-white); font-size: 0.95rem; margin-bottom: 16px; font-weight: 600; }
    .footer-col ul li { margin-bottom: 10px; }
    .footer-col ul li a { font-size: 0.9rem; opacity: 0.7; transition: var(--transition); }
    .footer-col ul li a:hover { opacity: 1; color: var(--accent-light); }
    .footer-bottom { padding: 20px 0; display: flex; align-items: center; justify-content: space-between; font-size: 0.8rem; opacity: 0.6; flex-wrap: wrap; gap: 12px; }

    /* ===== 响应式 ===== */
    @media (max-width: 1024px) {
        .features-grid { grid-template-columns: repeat(2, 1fr); }
        .stats-grid { grid-template-columns: repeat(2, 1fr); }
        .flow-grid { grid-template-columns: repeat(2, 1fr); }
        .flow-grid::before { display: none; }
        .footer-grid { grid-template-columns: repeat(2, 1fr); }
        .hero h1 { font-size: 2.6rem; }
    }
    @media (max-width: 768px) {
        .header-top-left span { display: none; }
        .nav-links { display: none; position: absolute; top: var(--nav-height); left: 0; right: 0; background: var(--bg-white); flex-direction: column; padding: 16px 24px; box-shadow: var(--shadow-md); border-bottom: 1px solid var(--border); gap: 4px; }
        .nav-links.open { display: flex; }
        .nav-links a { padding: 12px 16px; width: 100%; border-radius: var(--radius-sm); }
        .nav-links a.active::after { display: none; }
        .nav-toggle { display: flex; }
        .hero { min-height: 480px; }
        .hero h1 { font-size: 2rem; }
        .hero p { font-size: 1rem; }
        .features-grid { grid-template-columns: 1fr; }
        .category-grid { grid-template-columns: 1fr; }
        .news-grid { grid-template-columns: 1fr; }
        .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
        .stat-divider { display: none; }
        .flow-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
        .section { padding: 56px 0; }
        .section-title { margin-bottom: 40px; }
        .section-title h2 { font-size: 1.6rem; }
        .footer-grid { grid-template-columns: 1fr; gap: 28px; }
        .cta-section h2 { font-size: 1.6rem; }
        .hero-actions { flex-direction: column; align-items: stretch; }
        .hero-actions .btn-primary, .hero-actions .btn-secondary { justify-content: center; }
    }
    @media (max-width: 520px) {
        .container { padding: 0 16px; }
        .hero h1 { font-size: 1.6rem; }
        .hero-badge { font-size: 0.75rem; padding: 4px 14px; }
        .stat-number { font-size: 2rem; }
        .flow-grid { grid-template-columns: 1fr; }
        .nav-logo { font-size: 1.1rem; }
        .nav-logo .logo-icon { width: 30px; height: 30px; font-size: 1rem; }
        .footer-bottom { flex-direction: column; text-align: center; }
        .category-card { flex-direction: column; text-align: center; padding: 24px; }
        .category-card .cat-img { width: 70px; height: 70px; }
        .faq-question { font-size: 0.9rem; padding: 16px 18px; }
        .faq-answer { padding: 0 18px 16px; font-size: 0.85rem; }
    }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --primary-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
            --accent: #f59e0b;
            --accent-light: #fef3c7;
            --bg: #f8fafc;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-section-alt: #f1f5f9;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.10);
            --shadow-hover: 0 12px 40px rgba(37, 99, 235, 0.15);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
            --topbar-h: 0px;
        }

        /* ===== 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: 1.75;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
            background: none;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
        }
        h1 {
            font-size: 2.25rem;
        }
        h2 {
            font-size: 1.75rem;
        }
        h3 {
            font-size: 1.35rem;
        }
        h4 {
            font-size: 1.15rem;
        }
        p {
            margin-bottom: 1rem;
        }
        p:last-child {
            margin-bottom: 0;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 顶部信息条 ===== */
        .topbar {
            background: var(--bg-dark);
            color: var(--text-white);
            font-size: 0.8rem;
            padding: 6px 0;
            display: none;
        }
        .topbar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 6px 16px;
        }
        .topbar a {
            color: var(--accent);
            font-weight: 500;
        }
        .topbar a:hover {
            color: #fff;
        }
        .topbar .topbar-domain {
            opacity: 0.7;
        }

        /* ===== 主导航 ===== */
        .main-nav {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
            height: var(--header-h);
            display: flex;
            align-items: center;
        }
        .main-nav .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.3px;
        }
        .nav-logo:hover {
            color: var(--primary);
        }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--primary-gradient);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 900;
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-links a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-light);
            transition: all var(--transition);
            position: relative;
        }
        .nav-links a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav-links a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .nav-links a.nav-cta {
            background: var(--primary-gradient);
            color: #fff;
            padding: 8px 24px;
            border-radius: 50px;
            font-weight: 600;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
        }
        .nav-links a.nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
            background: linear-gradient(135deg, #1d4ed8 0%, #6d28d9 100%);
            color: #fff;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            background: transparent;
            border: none;
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text);
            border-radius: 4px;
            transition: var(--transition);
        }

        /* ===== 移动端导航 ===== */
        @media (max-width: 768px) {
            .nav-links {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px;
                gap: 6px;
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.10);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
                border-bottom: 2px solid var(--border);
                max-height: 80vh;
                overflow-y: auto;
            }
            .nav-links.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav-links a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1.05rem;
                border-radius: var(--radius-sm);
            }
            .nav-links a.nav-cta {
                text-align: center;
                margin-top: 8px;
            }
            .nav-toggle {
                display: flex;
            }
            .topbar .container {
                font-size: 0.7rem;
                justify-content: center;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .nav-logo {
                font-size: 1.1rem;
            }
            .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 0.9rem;
            }
            .container {
                padding: 0 16px;
            }
        }

        /* ===== 文章详情页 ===== */
        .article-page {
            padding: 48px 0 64px;
        }
        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-light);
            margin-bottom: 28px;
            flex-wrap: wrap;
        }
        .article-breadcrumb a {
            color: var(--text-light);
        }
        .article-breadcrumb a:hover {
            color: var(--primary);
        }
        .article-breadcrumb .sep {
            opacity: 0.4;
        }
        .article-breadcrumb .current {
            color: var(--text);
            font-weight: 500;
        }

        .article-header {
            margin-bottom: 36px;
        }
        .article-header h1 {
            font-size: 2.25rem;
            line-height: 1.3;
            margin-bottom: 16px;
            color: var(--text);
            letter-spacing: -0.5px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            align-items: center;
            color: var(--text-light);
            font-size: 0.9rem;
        }
        .article-meta .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
            font-size: 0.8rem;
        }
        .article-meta .date {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .date svg {
            width: 16px;
            height: 16px;
            opacity: 0.6;
        }

        .article-cover {
            border-radius: var(--radius-lg);
            overflow: hidden;
            margin-bottom: 36px;
            box-shadow: var(--shadow);
            background: var(--bg-section-alt);
        }
        .article-cover img {
            width: 100%;
            height: auto;
            max-height: 480px;
            object-fit: cover;
            border-radius: var(--radius-lg);
        }

        .article-body {
            max-width: 820px;
            margin: 0 auto;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 40px 48px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
        }
        .article-body .content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }
        .article-body .content p {
            margin-bottom: 1.25rem;
        }
        .article-body .content img {
            border-radius: var(--radius-sm);
            margin: 24px 0;
            box-shadow: var(--shadow);
        }
        .article-body .content h2,
        .article-body .content h3 {
            margin-top: 32px;
            margin-bottom: 14px;
        }
        .article-body .content ul,
        .article-body .content ol {
            margin: 16px 0;
            padding-left: 24px;
        }
        .article-body .content li {
            margin-bottom: 8px;
            list-style: disc;
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 16px 20px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 20px 0;
            color: var(--text-light);
            font-style: normal;
        }
        .article-body .content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-body .content a:hover {
            color: var(--primary-dark);
        }

        .article-notfound {
            text-align: center;
            padding: 80px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
        }
        .article-notfound .nf-icon {
            font-size: 4rem;
            margin-bottom: 20px;
            opacity: 0.3;
        }
        .article-notfound h2 {
            font-size: 1.75rem;
            margin-bottom: 12px;
            color: var(--text);
        }
        .article-notfound p {
            color: var(--text-light);
            margin-bottom: 24px;
            font-size: 1.05rem;
        }
        .article-notfound .btn-back {
            display: inline-block;
            padding: 12px 32px;
            background: var(--primary-gradient);
            color: #fff;
            border-radius: 50px;
            font-weight: 600;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
            transition: var(--transition);
        }
        .article-notfound .btn-back:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
            color: #fff;
        }

        /* ===== 相关推荐 ===== */
        .related-section {
            margin-top: 48px;
            padding-top: 40px;
            border-top: 1px solid var(--border);
        }
        .related-section h3 {
            font-size: 1.5rem;
            margin-bottom: 24px;
            text-align: center;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 20px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: all var(--transition);
            box-shadow: var(--shadow);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-light);
        }
        .related-card .rc-img {
            width: 100%;
            height: 150px;
            object-fit: cover;
            border-radius: 0;
            background: var(--bg-section-alt);
        }
        .related-card .rc-body {
            padding: 16px 18px 18px;
        }
        .related-card .rc-body h4 {
            font-size: 1rem;
            margin-bottom: 6px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .rc-body h4 a {
            color: var(--text);
        }
        .related-card .rc-body h4 a:hover {
            color: var(--primary);
        }
        .related-card .rc-body .rc-meta {
            font-size: 0.8rem;
            color: var(--text-light);
            display: flex;
            gap: 10px;
            align-items: center;
        }
        .related-card .rc-body .rc-meta .rc-badge {
            padding: 2px 10px;
            border-radius: 50px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.7rem;
            font-weight: 600;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: var(--text-white);
            padding: 56px 0 24px;
            margin-top: 48px;
        }
        .site-footer .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 36px;
            margin-bottom: 36px;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: var(--primary-gradient);
            color: #fff;
            border-radius: var(--radius-sm);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 900;
        }
        .footer-brand p {
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.9rem;
            line-height: 1.65;
            max-width: 340px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 14px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px 16px;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.6);
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .article-body {
                padding: 28px 24px;
            }
            .article-header h1 {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 768px) {
            .article-page {
                padding: 28px 0 40px;
            }
            .article-header h1 {
                font-size: 1.5rem;
            }
            .article-body {
                padding: 20px 16px;
                border-radius: var(--radius);
            }
            .article-body .content {
                font-size: 1rem;
            }
            .article-cover img {
                max-height: 240px;
            }
            .related-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .related-grid {
                grid-template-columns: 1fr;
            }
            .article-meta {
                font-size: 0.8rem;
                gap: 8px 16px;
            }
            .article-header h1 {
                font-size: 1.3rem;
            }
            .article-breadcrumb {
                font-size: 0.8rem;
            }
        }

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

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #007AFF;
            --primary-dark: #005BB5;
            --primary-light: #E8F2FF;
            --primary-gradient: linear-gradient(135deg, #007AFF 0%, #5856D6 100%);
            --secondary: #5856D6;
            --accent: #FF9500;
            --bg-body: #F8F9FC;
            --bg-white: #FFFFFF;
            --bg-card: #FFFFFF;
            --bg-dark: #1C1C1E;
            --bg-dark-light: #2C2C2E;
            --text-primary: #1C1C1E;
            --text-secondary: #6E6E73;
            --text-light: #AEAEB2;
            --text-white: #FFFFFF;
            --border-color: #E5E5EA;
            --border-radius-sm: 8px;
            --border-radius: 12px;
            --border-radius-lg: 20px;
            --border-radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.10);
            --shadow-hover: 0 16px 48px rgba(0, 122, 255, 0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --container-width: 1200px;
            --spacing-section: 80px;
            --spacing-block: 40px;
        }

        /* ===== 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-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            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(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .site-header .top-bar {
            background: var(--bg-dark);
            color: var(--text-light);
            font-size: 13px;
            padding: 6px 0;
            text-align: center;
            letter-spacing: 0.3px;
        }
        .site-header .top-bar a {
            color: var(--accent);
            font-weight: 500;
        }
        .site-header .top-bar a:hover {
            text-decoration: underline;
        }
        .main-nav {
            padding: 12px 0;
        }
        .main-nav .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            flex-shrink: 0;
        }
        .nav-logo .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: var(--primary-gradient);
            color: var(--text-white);
            font-size: 18px;
            font-weight: 700;
        }
        .nav-logo:hover {
            opacity: 0.85;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-links a {
            padding: 8px 18px;
            border-radius: var(--border-radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .nav-links a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav-links a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 2px;
            background: var(--primary);
        }
        .nav-links a.nav-cta {
            background: var(--primary-gradient);
            color: var(--text-white);
            padding: 8px 24px;
            border-radius: var(--border-radius);
            font-weight: 600;
            box-shadow: 0 4px 14px rgba(0, 122, 255, 0.30);
        }
        .nav-links a.nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 122, 255, 0.40);
            background: linear-gradient(135deg, #005BB5 0%, #3A3AC6 100%);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            cursor: pointer;
            background: none;
            border: none;
            border-radius: var(--border-radius-sm);
            transition: var(--transition);
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 3px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: var(--transition);
        }
        .nav-toggle:hover span {
            background: var(--primary);
        }

        /* ===== Button ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: var(--border-radius);
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            border: 2px solid transparent;
            line-height: 1.4;
            text-align: center;
            justify-content: center;
        }
        .btn-primary {
            background: var(--primary-gradient);
            color: var(--text-white);
            box-shadow: 0 4px 14px rgba(0, 122, 255, 0.30);
            border-color: transparent;
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 32px rgba(0, 122, 255, 0.40);
            color: var(--text-white);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
        }
        .btn-white {
            background: var(--text-white);
            color: var(--primary);
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
        }
        .btn-white:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 32px rgba(0, 0, 0, 0.12);
            color: var(--primary-dark);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 14px;
            border-radius: var(--border-radius-sm);
        }
        .btn-lg {
            padding: 16px 44px;
            font-size: 18px;
            border-radius: var(--border-radius-lg);
        }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.3px;
            background: var(--primary-light);
            color: var(--primary);
        }
        .badge-accent {
            background: rgba(255, 149, 0, 0.12);
            color: var(--accent);
        }
        .badge-green {
            background: rgba(52, 199, 89, 0.12);
            color: #34C759;
        }
        .badge-purple {
            background: rgba(88, 86, 214, 0.12);
            color: var(--secondary);
        }

        /* ===== Card ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            transition: var(--transition);
            border: 1px solid var(--border-color);
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(0, 122, 255, 0.15);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: 24px;
        }
        .card-body .badge {
            margin-bottom: 12px;
        }
        .card-body h3 {
            font-size: 20px;
            margin-bottom: 10px;
        }
        .card-body p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.6;
            margin-bottom: 16px;
        }
        .card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 16px;
            border-top: 1px solid var(--border-color);
        }
        .card-footer .btn {
            padding: 6px 16px;
            font-size: 13px;
        }

        /* ===== Section ===== */
        .section {
            padding: var(--spacing-section) 0;
        }
        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto var(--spacing-block);
        }
        .section-header .badge {
            margin-bottom: 16px;
        }
        .section-header h2 {
            font-size: 36px;
            margin-bottom: 14px;
            letter-spacing: -0.5px;
        }
        .section-header p {
            font-size: 18px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .section-header.light h2 {
            color: var(--text-white);
        }
        .section-header.light p {
            color: rgba(255, 255, 255, 0.75);
        }

        /* ===== Hero / Banner ===== */
        .page-hero {
            position: relative;
            padding: 100px 0 80px;
            background: var(--bg-dark);
            overflow: hidden;
            min-height: 360px;
            display: flex;
            align-items: center;
        }
        .page-hero .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25;
            mix-blend-mode: overlay;
        }
        .page-hero .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(0, 0, 0, 0.70) 0%, rgba(28, 28, 30, 0.50) 100%);
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
            color: var(--text-white);
        }
        .page-hero .badge {
            background: rgba(255, 255, 255, 0.15);
            color: var(--text-white);
            backdrop-filter: blur(6px);
            margin-bottom: 20px;
        }
        .page-hero h1 {
            font-size: 48px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 18px;
            letter-spacing: -1px;
        }
        .page-hero p {
            font-size: 20px;
            color: rgba(255, 255, 255, 0.80);
            max-width: 680px;
            margin: 0 auto 30px;
            line-height: 1.7;
        }
        .page-hero .hero-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== Grid ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }
        .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;
        }

        /* ===== Category Intro ===== */
        .cat-intro {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
            background: var(--bg-white);
            border-radius: var(--border-radius-lg);
            padding: 48px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-color);
        }
        .cat-intro img {
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .cat-intro h2 {
            font-size: 32px;
            margin-bottom: 16px;
        }
        .cat-intro p {
            color: var(--text-secondary);
            font-size: 17px;
            line-height: 1.7;
            margin-bottom: 20px;
        }
        .cat-intro .stat-row {
            display: flex;
            gap: 30px;
            margin-top: 24px;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
        }
        .cat-intro .stat-item {
            text-align: center;
        }
        .cat-intro .stat-item .num {
            font-size: 28px;
            font-weight: 800;
            color: var(--primary);
        }
        .cat-intro .stat-item .label {
            font-size: 14px;
            color: var(--text-light);
        }

        /* ===== App Card (特殊卡片) ===== */
        .app-card {
            display: flex;
            gap: 20px;
            background: var(--bg-card);
            border-radius: var(--border-radius);
            padding: 24px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            align-items: flex-start;
        }
        .app-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(0, 122, 255, 0.15);
        }
        .app-card .app-icon {
            width: 60px;
            height: 60px;
            border-radius: 16px;
            background: var(--primary-gradient);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            color: var(--text-white);
            flex-shrink: 0;
            box-shadow: 0 4px 12px rgba(0, 122, 255, 0.20);
        }
        .app-card .app-icon.purple {
            background: linear-gradient(135deg, #5856D6, #AF52DE);
        }
        .app-card .app-icon.orange {
            background: linear-gradient(135deg, #FF9500, #FF3B30);
        }
        .app-card .app-icon.green {
            background: linear-gradient(135deg, #34C759, #30B0C7);
        }
        .app-card .app-info {
            flex: 1;
        }
        .app-card .app-info h4 {
            font-size: 18px;
            margin-bottom: 4px;
        }
        .app-card .app-info .meta {
            font-size: 13px;
            color: var(--text-light);
            margin-bottom: 8px;
        }
        .app-card .app-info p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .app-card .app-action {
            flex-shrink: 0;
            align-self: center;
        }
        .app-card .app-action .btn {
            padding: 6px 16px;
            font-size: 13px;
            border-radius: var(--border-radius-sm);
        }

        /* ===== Timeline / Process ===== */
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--border-color);
            border-radius: 2px;
        }
        .timeline-item {
            position: relative;
            padding: 0 0 36px 30px;
        }
        .timeline-item:last-child {
            padding-bottom: 0;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -26px;
            top: 6px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--primary);
            border: 3px solid var(--bg-body);
            box-shadow: 0 0 0 3px var(--primary);
        }
        .timeline-item h4 {
            font-size: 18px;
            margin-bottom: 6px;
        }
        .timeline-item p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--border-radius);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(0, 122, 255, 0.15);
        }
        .faq-question {
            padding: 20px 28px;
            font-size: 17px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            background: none;
            width: 100%;
            text-align: left;
            color: var(--text-primary);
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question .icon {
            font-size: 20px;
            flex-shrink: 0;
            transition: var(--transition);
            color: var(--text-light);
        }
        .faq-item.active .faq-question .icon {
            transform: rotate(45deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 28px;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 400px;
            padding: 0 28px 24px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary-gradient);
            padding: 80px 0;
            text-align: center;
            border-radius: 0;
            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: 0.10;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 36px;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 600px;
            margin: 0 auto 30px;
            line-height: 1.7;
        }
        .cta-section .btn-white {
            padding: 16px 44px;
            font-size: 18px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: var(--text-light);
            padding: 60px 0 0;
        }
        .site-footer .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);
        }
        .site-footer .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 14px;
        }
        .site-footer .footer-logo .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            border-radius: 8px;
            background: var(--primary-gradient);
            color: var(--text-white);
            font-size: 16px;
            font-weight: 700;
        }
        .site-footer .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            opacity: 0.7;
            max-width: 320px;
        }
        .site-footer .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-white);
            margin-bottom: 18px;
        }
        .site-footer .footer-col ul li {
            margin-bottom: 10px;
        }
        .site-footer .footer-col ul li a {
            font-size: 14px;
            opacity: 0.7;
            transition: var(--transition);
        }
        .site-footer .footer-col ul li a:hover {
            opacity: 1;
            color: var(--primary);
        }
        .site-footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            font-size: 13px;
            opacity: 0.6;
            flex-wrap: wrap;
            gap: 8px;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-secondary);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb span {
            color: var(--text-primary);
        }
        .breadcrumb .sep {
            color: var(--text-light);
        }

        /* ===== 特色列表 ===== */
        .feature-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .feature-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 14px 18px;
            background: var(--bg-card);
            border-radius: var(--border-radius-sm);
            border: 1px solid var(--border-color);
            font-size: 15px;
            font-weight: 500;
            transition: var(--transition);
        }
        .feature-list li:hover {
            border-color: rgba(0, 122, 255, 0.20);
            box-shadow: var(--shadow-sm);
        }
        .feature-list li .check {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 14px;
            font-weight: 700;
            flex-shrink: 0;
        }

        /* ===== 标签云 ===== */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }
        .tag-cloud a {
            display: inline-block;
            padding: 6px 18px;
            border-radius: 100px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            font-size: 14px;
            color: var(--text-secondary);
            transition: var(--transition);
        }
        .tag-cloud a:hover {
            background: var(--primary-light);
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-2px);
        }

        /* ===== 分割线 ===== */
        .divider {
            width: 60px;
            height: 4px;
            border-radius: 2px;
            background: var(--primary-gradient);
            margin: 16px auto 0;
        }
        .divider.left {
            margin: 16px 0 0;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .cat-intro {
                grid-template-columns: 1fr;
                padding: 32px;
            }
            .cat-intro img {
                order: -1;
                max-height: 300px;
                object-fit: cover;
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-section: 50px;
                --spacing-block: 28px;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 24px;
                gap: 6px;
                border-bottom: 2px solid var(--border-color);
                box-shadow: var(--shadow-lg);
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                padding: 12px 16px;
                width: 100%;
                border-radius: var(--border-radius-sm);
            }
            .nav-links a.active::after {
                display: none;
            }
            .nav-links a.nav-cta {
                text-align: center;
                margin-top: 8px;
            }
            .nav-toggle {
                display: flex;
            }
            .page-hero {
                padding: 60px 0 50px;
                min-height: auto;
            }
            .page-hero h1 {
                font-size: 32px;
            }
            .page-hero p {
                font-size: 17px;
            }
            .section-header h2 {
                font-size: 28px;
            }
            .section-header p {
                font-size: 16px;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .cat-intro {
                padding: 24px;
            }
            .cat-intro h2 {
                font-size: 26px;
            }
            .cat-intro .stat-row {
                gap: 16px;
                flex-wrap: wrap;
            }
            .feature-list {
                grid-template-columns: 1fr;
            }
            .app-card {
                flex-direction: column;
                align-items: stretch;
            }
            .app-card .app-action {
                align-self: flex-end;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 28px;
            }
            .cta-section .btn-white {
                padding: 14px 32px;
                font-size: 16px;
            }
            .page-hero .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .page-hero .hero-actions .btn {
                width: 100%;
                max-width: 300px;
            }
            .faq-question {
                padding: 16px 20px;
                font-size: 15px;
            }
            .faq-answer {
                padding: 0 20px;
                font-size: 14px;
            }
            .faq-item.active .faq-answer {
                padding: 0 20px 18px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .nav-logo {
                font-size: 18px;
            }
            .nav-logo .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 15px;
            }
            .page-hero h1 {
                font-size: 26px;
            }
            .page-hero p {
                font-size: 15px;
            }
            .section-header h2 {
                font-size: 24px;
            }
            .card-body {
                padding: 18px;
            }
            .card-body h3 {
                font-size: 18px;
            }
            .cat-intro .stat-item .num {
                font-size: 22px;
            }
            .tag-cloud a {
                font-size: 13px;
                padding: 4px 14px;
            }
        }

        /* ===== 附加工具类 ===== */
        .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-16 {
            gap: 16px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }
        .bg-white {
            background: var(--bg-white);
        }
        .rounded-lg {
            border-radius: var(--border-radius-lg);
        }
        .shadow-card {
            box-shadow: var(--shadow);
        }