/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #0f1f3d;
            --primary-light: #1a3366;
            --primary-dark: #0a1528;
            --secondary: #f59e0b;
            --secondary-light: #fbbf24;
            --secondary-dark: #d97706;
            --accent: #ef4444;
            --bg: #ffffff;
            --bg-alt: #f1f5f9;
            --bg-card: #ffffff;
            --text: #0f172a;
            --text-light: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10);
            --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.14);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --nav-width: 260px;
            --header-height: 64px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --section-gap: 80px;
        }

        /* ===== 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);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            display: flex;
            min-height: 100vh;
        }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--secondary); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius); }
        button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
        button { cursor: pointer; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text); }
        h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
        h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); }
        h3 { font-size: 1.25rem; }
        h4 { font-size: 1.1rem; }
        p { margin-bottom: 0.5rem; color: var(--text-light); }
        .container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
        .section { padding: var(--section-gap) 0; }
        .section-title { text-align: center; margin-bottom: 48px; }
        .section-title h2 { margin-bottom: 12px; }
        .section-title p { max-width: 600px; margin: 0 auto; color: var(--text-light); font-size: 1.05rem; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

        /* ===== Sidebar Navigation ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--primary);
            color: #fff;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            padding: 28px 20px;
            transition: transform var(--transition);
            overflow-y: auto;
            box-shadow: 2px 0 20px rgba(0,0,0,0.15);
        }
        .sidebar-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 8px 4px 24px;
            border-bottom: 1px solid rgba(255,255,255,0.10);
            margin-bottom: 28px;
        }
        .sidebar-logo .logo-icon {
            width: 40px;
            height: 40px;
            background: var(--secondary);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--primary);
            flex-shrink: 0;
        }
        .sidebar-logo .logo-text {
            font-size: 1.35rem;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: #fff;
        }
        .sidebar-nav { flex: 1; }
        .sidebar-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.70);
            font-size: 1rem;
            font-weight: 500;
            transition: all var(--transition);
            margin-bottom: 4px;
        }
        .sidebar-nav .nav-item i { width: 20px; text-align: center; font-size: 1.1rem; }
        .sidebar-nav .nav-item:hover { background: rgba(255,255,255,0.08); color: #fff; }
        .sidebar-nav .nav-item.active {
            background: var(--secondary);
            color: var(--primary);
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(245,158,11,0.30);
        }
        .sidebar-nav .nav-item.active:hover { color: var(--primary); }
        .sidebar-footer {
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.08);
            font-size: 0.8rem;
            color: rgba(255,255,255,0.35);
            text-align: center;
        }

        /* ===== Main Content Area ===== */
        .main-content {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            background: var(--bg);
        }

        /* ===== Mobile Header ===== */
        .mobile-header {
            display: none;
            position: sticky;
            top: 0;
            z-index: 900;
            background: var(--primary);
            padding: 0 20px;
            height: var(--header-height);
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 12px rgba(0,0,0,0.12);
        }
        .mobile-header .logo-text {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
        }
        .mobile-header .menu-toggle {
            color: #fff;
            font-size: 1.5rem;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .mobile-header .menu-toggle:hover { background: rgba(255,255,255,0.10); }
        .mobile-overlay {
            display: none;
            position: fixed;
            top: 0; left: 0; width: 100%; height: 100%;
            background: rgba(0,0,0,0.45);
            z-index: 999;
            opacity: 0;
            transition: opacity var(--transition);
        }
        .mobile-overlay.open { opacity: 1; }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 70vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(15,31,61,0.88) 0%, rgba(26,51,102,0.75) 100%), url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            color: #fff;
            padding: 80px 24px;
            text-align: center;
        }
        .hero-content { position: relative; z-index: 2; max-width: 780px; }
        .hero-badge {
            display: inline-block;
            background: var(--secondary);
            color: var(--primary);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 20px;
        }
        .hero h1 { color: #fff; margin-bottom: 16px; font-weight: 800; }
        .hero h1 span { color: var(--secondary); }
        .hero p {
            font-size: 1.2rem;
            color: rgba(255,255,255,0.80);
            max-width: 600px;
            margin: 0 auto 32px;
            line-height: 1.8;
        }
        .hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
            border: 2px solid transparent;
        }
        .btn-primary {
            background: var(--secondary);
            color: var(--primary);
            border-color: var(--secondary);
        }
        .btn-primary:hover { background: var(--secondary-light); border-color: var(--secondary-light); color: var(--primary); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,158,11,0.35); }
        .btn-outline {
            background: transparent;
            color: #fff;
            border-color: rgba(255,255,255,0.40);
        }
        .btn-outline:hover { background: rgba(255,255,255,0.12); border-color: #fff; color: #fff; transform: translateY(-2px); }

        /* ===== Featured / 品牌介绍 ===== */
        .featured-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 36px 28px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: all var(--transition);
            text-align: center;
        }
        .feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
        .feature-card .icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            margin: 0 auto 18px;
        }
        .feature-card h3 { margin-bottom: 10px; }
        .feature-card p { font-size: 0.95rem; color: var(--text-light); }

        /* ===== Category / 分类入口 ===== */
        .category-section { background: var(--bg-alt); }
        .category-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--primary);
            min-height: 320px;
            display: flex;
            align-items: flex-end;
            box-shadow: var(--shadow);
            transition: all var(--transition);
        }
        .category-card:hover { transform: scale(1.01); box-shadow: var(--shadow-lg); }
        .category-card img {
            position: absolute;
            top: 0; left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.40;
            transition: opacity var(--transition);
        }
        .category-card:hover img { opacity: 0.30; }
        .category-card .overlay {
            position: relative;
            z-index: 2;
            padding: 32px 28px;
            color: #fff;
            width: 100%;
            background: linear-gradient(transparent, rgba(0,0,0,0.60));
        }
        .category-card .overlay h3 { font-size: 1.6rem; color: #fff; margin-bottom: 6px; }
        .category-card .overlay p { color: rgba(255,255,255,0.75); font-size: 0.95rem; margin-bottom: 14px; }
        .category-card .overlay .tag {
            display: inline-block;
            background: var(--secondary);
            color: var(--primary);
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
        }

        /* ===== News / 资讯列表 ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .news-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
        .news-card .thumb {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
        }
        .news-card .body { padding: 22px 24px 24px; flex: 1; display: flex; flex-direction: column; }
        .news-card .body .meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.82rem;
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        .news-card .body .meta .cat {
            background: var(--bg-alt);
            padding: 2px 12px;
            border-radius: 50px;
            color: var(--text-light);
            font-weight: 500;
        }
        .news-card .body h3 { font-size: 1.1rem; margin-bottom: 8px; transition: color var(--transition); }
        .news-card:hover .body h3 { color: var(--secondary); }
        .news-card .body p { font-size: 0.92rem; color: var(--text-light); flex: 1; }
        .news-card .body .read-more {
            margin-top: 14px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .news-card .body .read-more i { transition: transform var(--transition); }
        .news-card:hover .body .read-more i { transform: translateX(4px); }
        .empty-news {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 20px;
            background: var(--bg-alt);
            border-radius: var(--radius);
            color: var(--text-muted);
            font-size: 1.05rem;
        }

        /* ===== Stats / 数据统计 ===== */
        .stats-section {
            background: var(--primary);
            color: #fff;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            text-align: center;
        }
        .stat-item .num {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--secondary);
            line-height: 1.1;
            margin-bottom: 6px;
        }
        .stat-item .label { font-size: 1rem; color: rgba(255,255,255,0.60); font-weight: 500; }

        /* ===== Process / 服务流程 ===== */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-card {
            text-align: center;
            padding: 28px 16px;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
        .step-card .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--secondary);
            font-size: 1.4rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
        }
        .step-card h4 { margin-bottom: 8px; }
        .step-card p { font-size: 0.9rem; color: var(--text-light); }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--secondary); }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1.05rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            background: var(--bg-alt);
            transition: background var(--transition);
        }
        .faq-question:hover { background: var(--border-light); }
        .faq-question i { transition: transform var(--transition); color: var(--text-muted); }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: all 0.35s ease;
            color: var(--text-light);
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            padding: 18px 24px 22px;
            max-height: 400px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            color: #fff;
            text-align: center;
            padding: 80px 24px;
        }
        .cta-section h2 { color: #fff; margin-bottom: 12px; }
        .cta-section p { color: rgba(255,255,255,0.70); max-width: 560px; margin: 0 auto 28px; font-size: 1.05rem; }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.60);
            padding: 48px 24px 32px;
        }
        .footer-inner { max-width: var(--max-width); margin: 0 auto; }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-brand .logo-text { font-size: 1.3rem; font-weight: 700; color: #fff; margin-bottom: 12px; display: block; }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.50); max-width: 300px; line-height: 1.7; }
        .footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.55);
            font-size: 0.9rem;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover { color: var(--secondary); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.35);
        }
        .footer-bottom a { color: rgba(255,255,255,0.35); }
        .footer-bottom a:hover { color: var(--secondary); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .featured-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .process-steps { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
        }

        @media (max-width: 768px) {
            .sidebar { transform: translateX(-100%); }
            .sidebar.open { transform: translateX(0); }
            .main-content { margin-left: 0; }
            .mobile-header { display: flex; }
            .mobile-overlay.open { display: block; }
            .hero { min-height: 60vh; padding: 60px 20px; }
            .hero h1 { font-size: 1.8rem; }
            .hero p { font-size: 1rem; }
            .featured-grid { grid-template-columns: 1fr; }
            .news-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
            .stat-item .num { font-size: 2rem; }
            .process-steps { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .section { padding: 48px 0; }
            .section-title { margin-bottom: 32px; }
            :root { --section-gap: 48px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-section { padding: 56px 20px; }
        }

        @media (max-width: 520px) {
            .hero { min-height: 50vh; padding: 40px 16px; }
            .hero h1 { font-size: 1.5rem; }
            .hero-actions { flex-direction: column; align-items: center; }
            .btn { width: 100%; justify-content: center; padding: 12px 24px; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
            .stat-item .num { font-size: 1.7rem; }
            .news-card .thumb { height: 160px; }
            .news-card .body { padding: 16px 18px 20px; }
            .category-card { min-height: 240px; }
            .feature-card { padding: 24px 18px; }
            .container { padding: 0 16px; }
        }

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

/* roulang page: article */
:root {
    --primary: #e53935;
    --primary-dark: #c62828;
    --primary-light: #ff6f60;
    --primary-bg: #fff5f5;
    --accent: #ff8f00;
    --accent-light: #ffc107;
    --bg: #f8f9fa;
    --surface: #ffffff;
    --text: #1a1a2e;
    --text-secondary: #5a5a7a;
    --text-light: #8e8ea0;
    --border: #e8e8f0;
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --shadow: 0 4px 24px rgba(0,0,0,0.06);
    --shadow-hover: 0 12px 40px rgba(0,0,0,0.10);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    --sidebar-width: 240px;
    --header-height: 64px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
button, input, textarea { font-family: inherit; font-size: inherit; border: none; outline: none; }
ul, ol { list-style: none; }
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
}
@media (max-width: 768px) {
    .container { padding: 0 20px; }
}

/* ===== 左侧导航 ===== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 28px 0 20px;
}
.sidebar-logo {
    padding: 0 24px 32px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
}
.sidebar-logo .logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 20px;
    font-weight: 700;
    flex-shrink: 0;
}
.sidebar-logo .logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.3px;
}
.sidebar-nav {
    flex: 1;
    padding: 0 12px;
    overflow-y: auto;
}
.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 15px;
    margin-bottom: 4px;
    transition: var(--transition);
}
.sidebar-nav a i {
    width: 22px;
    font-size: 18px;
    text-align: center;
    flex-shrink: 0;
}
.sidebar-nav a:hover {
    background: var(--primary-bg);
    color: var(--primary);
}
.sidebar-nav a.active {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 16px rgba(229,57,53,0.30);
}
.sidebar-nav .nav-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-light);
    padding: 16px 16px 8px;
    font-weight: 600;
}
.sidebar-footer {
    padding: 20px 24px 0;
    border-top: 1px solid var(--border);
    margin-top: auto;
}
.sidebar-footer .social-links {
    display: flex;
    gap: 12px;
}
.sidebar-footer .social-links a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 16px;
    transition: var(--transition);
}
.sidebar-footer .social-links a:hover {
    background: var(--primary);
    color: #fff;
}

/* ===== 移动端顶部栏 ===== */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    z-index: 999;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}
.mobile-header .menu-toggle {
    background: none;
    font-size: 22px;
    color: var(--text);
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}
.mobile-header .menu-toggle:hover { background: var(--bg); }
.mobile-header .logo-text {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
}

/* ===== 主内容区 ===== */
.main-wrapper {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.main-content {
    flex: 1;
    padding: 40px 0 60px;
}

/* ===== 文章 Banner ===== */
.article-banner {
    position: relative;
    padding: 80px 0 60px;
    background: linear-gradient(135deg, #1a1a2e 0%, #2d2d44 100%);
    overflow: hidden;
}
.article-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
    opacity: 0.15;
    mix-blend-mode: overlay;
}
.article-banner .banner-inner {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 32px;
}
.article-banner .breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 24px;
    flex-wrap: wrap;
}
.article-banner .breadcrumb a {
    color: rgba(255,255,255,0.7);
    transition: var(--transition);
}
.article-banner .breadcrumb a:hover { color: #fff; }
.article-banner .breadcrumb i { font-size: 12px; color: rgba(255,255,255,0.4); }
.article-banner .category-tag {
    display: inline-block;
    padding: 6px 18px;
    background: var(--primary);
    color: #fff;
    border-radius: 30px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}
.article-banner h1 {
    font-size: clamp(26px, 4vw, 44px);
    font-weight: 800;
    color: #fff;
    line-height: 1.25;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}
.article-banner .meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    color: rgba(255,255,255,0.7);
    font-size: 14px;
}
.article-banner .meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}
.article-banner .meta i { font-size: 15px; }

/* ===== 文章正文 ===== */
.article-body {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 32px;
}
.article-content {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 48px 56px;
    box-shadow: var(--shadow);
    margin-top: -40px;
    position: relative;
    z-index: 2;
}
.article-content .content-text {
    font-size: 17px;
    line-height: 1.9;
    color: var(--text);
}
.article-content .content-text p {
    margin-bottom: 1.5em;
}
.article-content .content-text h2 {
    font-size: 24px;
    font-weight: 700;
    margin: 2em 0 1em;
    color: var(--text);
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-bg);
}
.article-content .content-text h3 {
    font-size: 20px;
    font-weight: 600;
    margin: 1.6em 0 0.8em;
    color: var(--text);
}
.article-content .content-text ul, 
.article-content .content-text ol {
    margin: 1em 0 1.5em;
    padding-left: 24px;
}
.article-content .content-text li {
    margin-bottom: 0.5em;
    list-style: disc;
}
.article-content .content-text a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}
.article-content .content-text a:hover { color: var(--primary-dark); }
.article-content .content-text blockquote {
    border-left: 4px solid var(--primary);
    background: var(--primary-bg);
    padding: 16px 24px;
    margin: 1.5em 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-secondary);
    font-style: italic;
}
.article-content .content-text img {
    border-radius: var(--radius-sm);
    margin: 1.5em auto;
    box-shadow: var(--shadow);
}
.article-content .content-text .highlight-box {
    background: linear-gradient(135deg, #fef3e2, #fff8e7);
    border: 1px solid #ffe0a0;
    border-radius: var(--radius-sm);
    padding: 20px 24px;
    margin: 1.5em 0;
}
.article-content .content-empty {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}
.article-content .content-empty i {
    font-size: 48px;
    color: var(--border);
    margin-bottom: 16px;
}
.article-content .content-empty p {
    font-size: 18px;
    margin-bottom: 16px;
}
.article-content .content-empty a {
    display: inline-block;
    padding: 12px 32px;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: var(--transition);
}
.article-content .content-empty a:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(229,57,53,0.30);
}

/* ===== 文章底部 ===== */
.article-footer-bar {
    max-width: 900px;
    margin: 32px auto 0;
    padding: 0 32px;
}
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 32px;
}
.article-tags .tag {
    display: inline-block;
    padding: 6px 18px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 30px;
    font-size: 13px;
    color: var(--text-secondary);
    transition: var(--transition);
}
.article-tags .tag:hover {
    background: var(--primary-bg);
    border-color: var(--primary-light);
    color: var(--primary);
}
.article-share {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 20px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    margin-bottom: 40px;
}
.article-share span {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 14px;
}
.article-share a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 16px;
    transition: var(--transition);
}
.article-share a:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}

/* ===== 相关推荐 ===== */
.related-section {
    max-width: 1200px;
    margin: 60px auto 0;
    padding: 0 32px;
}
.related-section h2 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.related-section h2 i {
    color: var(--primary);
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.related-card {
    background: var(--surface);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border);
}
.related-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}
.related-card .card-img {
    height: 180px;
    background: var(--bg);
    position: relative;
    overflow: hidden;
}
.related-card .card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.related-card:hover .card-img img { transform: scale(1.05); }
.related-card .card-img .card-cat {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 14px;
    background: rgba(229,57,53,0.92);
    color: #fff;
    border-radius: 30px;
    font-size: 12px;
    font-weight: 600;
    backdrop-filter: blur(4px);
}
.related-card .card-body {
    padding: 20px 22px 22px;
}
.related-card .card-body h3 {
    font-size: 17px;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.related-card .card-body h3 a { color: var(--text); }
.related-card .card-body h3 a:hover { color: var(--primary); }
.related-card .card-body .card-date {
    font-size: 13px;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ===== 页脚 ===== */
.footer {
    background: #1a1a2e;
    color: rgba(255,255,255,0.8);
    padding: 60px 32px 30px;
    margin-top: 60px;
}
.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-brand .logo-text {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    display: block;
    margin-bottom: 12px;
}
.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255,255,255,0.6);
    max-width: 300px;
}
.footer-col h4 {
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}
.footer-col a {
    display: block;
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    padding: 6px 0;
    transition: var(--transition);
}
.footer-col a:hover {
    color: var(--primary-light);
    padding-left: 4px;
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}

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

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .mobile-header {
        display: flex;
    }
    .main-wrapper {
        margin-left: 0;
        padding-top: var(--header-height);
    }
    .main-content {
        padding: 24px 0 40px;
    }
    .article-banner {
        padding: 48px 0 40px;
    }
    .article-banner .banner-inner,
    .article-body,
    .article-footer-bar {
        padding: 0 20px;
    }
    .article-content {
        padding: 28px 24px;
        margin-top: -24px;
    }
    .article-content .content-text {
        font-size: 16px;
    }
    .related-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .footer {
        padding: 40px 20px 24px;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    .article-share a {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }
}

@media (max-width: 520px) {
    .container {
        padding: 0 16px;
    }
    .article-banner h1 {
        font-size: 22px;
    }
    .article-content {
        padding: 20px 16px;
    }
    .article-content .content-text {
        font-size: 15px;
    }
    .related-card .card-body {
        padding: 16px 18px 18px;
    }
    .related-card .card-img {
        height: 160px;
    }
}

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a56db;
            --primary-light: #3b82f6;
            --primary-dark: #1e40af;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --accent-dark: #d97706;
            --bg: #f8fafc;
            --bg-card: #ffffff;
            --bg-sidebar: #0f172a;
            --bg-header: #ffffff;
            --text: #1e293b;
            --text-light: #64748b;
            --text-inverse: #f1f5f9;
            --border: #e2e8f0;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --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, 0.12);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --sidebar-width: 240px;
            --header-height: 64px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== 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);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }
        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;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
        }
        h1 {
            font-size: 2.8rem;
        }
        h2 {
            font-size: 2rem;
        }
        h3 {
            font-size: 1.4rem;
        }
        h4 {
            font-size: 1.1rem;
        }

        /* ===== 布局容器 ===== */
        .app-shell {
            display: flex;
            min-height: 100vh;
        }
        .main-content {
            flex: 1;
            margin-left: var(--sidebar-width);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }
        .section {
            padding: 72px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            position: relative;
            display: inline-block;
            margin-bottom: 12px;
        }
        .section-title h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin: 12px auto 0;
        }
        .section-title p {
            color: var(--text-light);
            font-size: 1.05rem;
            max-width: 620px;
            margin: 0 auto;
            margin-top: 8px;
        }

        /* ===== 左侧导航 Sidebar ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-sidebar);
            color: var(--text-inverse);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            box-shadow: 2px 0 20px rgba(0, 0, 0, 0.2);
            transition: transform var(--transition);
        }
        .sidebar-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 20px 22px;
            font-size: 1.4rem;
            font-weight: 800;
            letter-spacing: 0.5px;
            color: #ffffff;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .sidebar-logo i {
            font-size: 1.6rem;
            color: var(--accent);
        }
        .sidebar-nav {
            flex: 1;
            padding: 20px 0;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 22px;
            font-size: 0.95rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.7);
            border-left: 3px solid transparent;
            transition: all var(--transition);
        }
        .sidebar-nav a i {
            width: 20px;
            font-size: 1.1rem;
            text-align: center;
        }
        .sidebar-nav a:hover {
            color: #ffffff;
            background: rgba(255, 255, 255, 0.06);
            border-left-color: var(--accent);
        }
        .sidebar-nav a.active {
            color: #ffffff;
            background: rgba(255, 255, 255, 0.08);
            border-left-color: var(--accent);
            font-weight: 600;
        }
        .sidebar-nav a.active i {
            color: var(--accent);
        }
        .sidebar-footer {
            padding: 16px 22px;
            font-size: 0.75rem;
            color: rgba(255, 255, 255, 0.35);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            text-align: center;
        }

        /* ===== 移动端头部 ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: var(--bg-header);
            border-bottom: 1px solid var(--border);
            z-index: 1100;
            align-items: center;
            justify-content: space-between;
            padding: 0 16px;
            box-shadow: var(--shadow-sm);
        }
        .mobile-header .logo-text {
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--primary);
        }
        .menu-toggle {
            font-size: 1.5rem;
            color: var(--text);
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .menu-toggle:hover {
            background: var(--border);
        }
        .menu-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.45);
            z-index: 1050;
            opacity: 0;
            transition: opacity var(--transition);
        }
        .menu-overlay.open {
            opacity: 1;
        }

        /* ===== Hero / Banner ===== */
        .category-hero {
            padding: 100px 0 80px;
            background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            background-blend-mode: overlay;
            color: #ffffff;
            text-align: center;
            position: relative;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(0, 0, 0, 0.35);
            z-index: 0;
        }
        .category-hero .container {
            position: relative;
            z-index: 1;
        }
        .category-hero h1 {
            font-size: 3rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 16px;
            letter-spacing: 1px;
        }
        .category-hero h1 span {
            color: var(--accent);
        }
        .category-hero p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 680px;
            margin: 0 auto 28px;
            line-height: 1.8;
        }
        .category-hero .hero-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
        }
        .category-hero .hero-tags span {
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(4px);
            padding: 6px 18px;
            border-radius: 100px;
            font-size: 0.85rem;
            color: #ffffff;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        /* ===== 介绍区块 ===== */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }
        .intro-image img {
            width: 100%;
            height: 360px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .intro-image img:hover {
            transform: scale(1.03);
        }
        .intro-text h2 {
            margin-bottom: 16px;
        }
        .intro-text p {
            color: var(--text-light);
            margin-bottom: 16px;
            font-size: 1.02rem;
        }
        .intro-text .feature-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-top: 20px;
        }
        .intro-text .feature-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 500;
        }
        .intro-text .feature-list li i {
            color: var(--accent);
            font-size: 1.1rem;
        }

        /* ===== 卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
            gap: 28px;
        }
        .card-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--border);
        }
        .card-item:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        .card-item .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .card-item .card-body {
            padding: 20px 22px 24px;
        }
        .card-item .card-body h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }
        .card-item .card-body p {
            color: var(--text-light);
            font-size: 0.92rem;
            line-height: 1.6;
            margin-bottom: 14px;
        }
        .card-item .card-body .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.82rem;
            color: var(--text-light);
        }
        .card-item .card-body .card-meta .tag {
            display: inline-block;
            background: var(--primary);
            color: #ffffff;
            padding: 2px 12px;
            border-radius: 100px;
            font-size: 0.75rem;
            font-weight: 500;
        }
        .card-item .card-body .card-meta .tag.accent {
            background: var(--accent);
            color: #1e293b;
        }

        /* ===== 数据统计 ===== */
        .stats-section {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            color: #ffffff;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }
        .stats-item .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .stats-item .stat-label {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.8);
            margin-top: 6px;
        }

        /* ===== 热门推荐列表 ===== */
        .hot-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .hot-item {
            display: flex;
            align-items: center;
            gap: 20px;
            background: var(--bg-card);
            padding: 18px 22px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .hot-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
        }
        .hot-item .hot-rank {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--accent);
            min-width: 36px;
            text-align: center;
        }
        .hot-item .hot-info {
            flex: 1;
        }
        .hot-item .hot-info h4 {
            font-size: 1rem;
            margin-bottom: 4px;
        }
        .hot-item .hot-info p {
            color: var(--text-light);
            font-size: 0.88rem;
        }
        .hot-item .hot-badge {
            background: var(--primary);
            color: #ffffff;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 0.78rem;
            font-weight: 500;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1.02rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            user-select: none;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: #f1f5f9;
        }
        .faq-question i {
            color: var(--primary);
            font-size: 1.1rem;
            transition: transform var(--transition);
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
            display: none;
        }
        .faq-answer.open {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--accent-dark), var(--accent));
            color: #1e293b;
            text-align: center;
            padding: 72px 0;
        }
        .cta-section h2 {
            color: #1e293b;
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.08rem;
            max-width: 600px;
            margin: 0 auto 28px;
            opacity: 0.85;
        }
        .btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: 2px solid transparent;
        }
        .btn-primary {
            background: #1e293b;
            color: #ffffff;
            border-color: #1e293b;
        }
        .btn-primary:hover {
            background: #0f172a;
            border-color: #0f172a;
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
        }
        .btn-outline {
            background: transparent;
            color: #1e293b;
            border-color: #1e293b;
        }
        .btn-outline:hover {
            background: #1e293b;
            color: #ffffff;
            transform: translateY(-2px);
        }

        /* ===== 页脚 Footer ===== */
        .footer {
            background: #0f172a;
            color: rgba(255, 255, 255, 0.8);
            padding: 60px 0 0;
            margin-top: auto;
        }
        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo-text {
            font-size: 1.4rem;
            font-weight: 800;
            color: #ffffff;
            display: block;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 600;
            color: #ffffff;
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.6);
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom span {
            margin: 4px 0;
        }

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

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .main-content {
                margin-left: 0;
                padding-top: var(--header-height);
            }
            .mobile-header {
                display: flex;
            }
            .menu-overlay.open {
                display: block;
            }
            .category-hero {
                padding: 72px 0 56px;
            }
            .category-hero h1 {
                font-size: 2.2rem;
            }
            .category-hero p {
                font-size: 1rem;
            }
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .intro-image img {
                height: 240px;
            }
            .section {
                padding: 48px 0;
            }
            .section-title {
                margin-bottom: 32px;
            }
            .card-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .stats-item .stat-number {
                font-size: 2.2rem;
            }
            .hot-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .hot-item .hot-rank {
                font-size: 1.2rem;
                min-width: auto;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .container {
                padding: 0 16px;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .btn {
                padding: 10px 24px;
                font-size: 0.9rem;
            }
        }

        @media (max-width: 520px) {
            .card-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .category-hero h1 {
                font-size: 1.8rem;
            }
            .category-hero .hero-tags span {
                font-size: 0.75rem;
                padding: 4px 12px;
            }
            .section {
                padding: 36px 0;
            }
            .faq-question {
                font-size: 0.95rem;
                padding: 14px 18px;
            }
            .faq-answer {
                padding: 0 18px 14px;
                font-size: 0.88rem;
            }
        }

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