/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a2a3a;
            --primary-light: #2c4055;
            --accent: #c9a84c;
            --accent-hover: #b8942f;
            --accent-light: #f5e8c8;
            --bg-body: #f8f6f3;
            --bg-card: #ffffff;
            --bg-dark: #0f1a26;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-muted: #8e8ea0;
            --text-light: #f0ece4;
            --border-color: #e5e0d8;
            --radius: 12px;
            --radius-sm: 6px;
            --radius-lg: 20px;
            --shadow: 0 4px 20px rgba(0,0,0,0.06);
            --shadow-hover: 0 12px 40px rgba(0,0,0,0.12);
            --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
            --nav-width: 260px;
            --header-height: 72px;
        }
        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; font-size: 16px; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            display: flex;
            min-height: 100vh;
        }
        a { color: var(--accent); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--accent-hover); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        ul { list-style: none; }
        /* ===== 左侧竖向导航 ===== */
        .side-nav {
            position: fixed;
            top: 0; left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--primary);
            color: var(--text-light);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            padding: 0;
            box-shadow: 2px 0 30px rgba(0,0,0,0.15);
        }
        .side-nav .logo-area {
            padding: 32px 24px 20px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            text-align: center;
        }
        .side-nav .logo-area .logo-text {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--accent);
            letter-spacing: 2px;
            line-height: 1.3;
        }
        .side-nav .logo-area .logo-sub {
            font-size: 0.75rem;
            color: rgba(255,255,255,0.5);
            margin-top: 4px;
            letter-spacing: 4px;
        }
        .side-nav .nav-list {
            padding: 20px 16px;
            flex: 1;
        }
        .side-nav .nav-list li { margin-bottom: 4px; }
        .side-nav .nav-list a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.7);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
        }
        .side-nav .nav-list a i { width: 20px; text-align: center; font-size: 1.1rem; }
        .side-nav .nav-list a:hover { background: rgba(255,255,255,0.08); color: #fff; }
        .side-nav .nav-list a.active { background: var(--accent); color: var(--primary); font-weight: 600; }
        .side-nav .nav-footer {
            padding: 20px 24px;
            border-top: 1px solid rgba(255,255,255,0.08);
            font-size: 0.75rem;
            color: rgba(255,255,255,0.35);
            text-align: center;
        }
        /* ===== 右侧内容区 ===== */
        .main-content {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        /* ===== 移动端顶部栏 ===== */
        .mobile-topbar {
            display: none;
            position: fixed;
            top: 0; left: 0; right: 0;
            height: var(--header-height);
            background: var(--primary);
            z-index: 999;
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 20px rgba(0,0,0,0.15);
        }
        .mobile-topbar .logo-text {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--accent);
        }
        .mobile-topbar .menu-toggle {
            background: none;
            border: none;
            color: #fff;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 4px 8px;
        }
        .mobile-nav-overlay {
            display: none;
            position: fixed;
            top: var(--header-height); left: 0; right: 0; bottom: 0;
            background: var(--primary);
            z-index: 998;
            padding: 20px;
            overflow-y: auto;
        }
        .mobile-nav-overlay.open { display: block; }
        .mobile-nav-overlay a {
            display: block;
            padding: 14px 16px;
            color: rgba(255,255,255,0.7);
            font-size: 1.05rem;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .mobile-nav-overlay a i { margin-right: 12px; width: 20px; }
        .mobile-nav-overlay a.active { color: var(--accent); font-weight: 600; }
        /* ===== 容器 & 板块 ===== */
        .container { max-width: 1200px; margin: 0 auto; padding: 0 28px; }
        .section { padding: 72px 0; }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
            letter-spacing: -0.5px;
        }
        .section-sub {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin-bottom: 40px;
            line-height: 1.6;
        }
        .section-divider {
            width: 60px;
            height: 3px;
            background: var(--accent);
            margin: 16px 0 32px;
            border-radius: 4px;
        }
        .text-center .section-divider { margin-left: auto; margin-right: auto; }
        .text-center .section-sub { margin-left: auto; margin-right: auto; }
        /* ===== Hero ===== */
        .hero-section {
            position: relative;
            padding: 100px 0 80px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--bg-dark) 100%);
            color: #fff;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.2;
            z-index: 0;
        }
        .hero-section .container { position: relative; z-index: 1; }
        .hero-section h1 {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -1px;
        }
        .hero-section h1 span { color: var(--accent); }
        .hero-section .hero-desc {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.8);
            max-width: 560px;
            margin-bottom: 36px;
            line-height: 1.7;
        }
        .hero-section .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            line-height: 1.2;
        }
        .btn-primary { background: var(--accent); color: var(--primary); }
        .btn-primary:hover { background: var(--accent-hover); color: var(--primary); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(201,168,76,0.35); }
        .btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.3); }
        .btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        .hero-stats .stat-num { font-size: 2rem; font-weight: 700; color: var(--accent); }
        .hero-stats .stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.6); }
        /* ===== 卡片网格 ===== */
        .card-grid { display: grid; gap: 28px; }
        .card-grid-2 { grid-template-columns: repeat(2, 1fr); }
        .card-grid-3 { grid-template-columns: repeat(3, 1fr); }
        .card-grid-4 { grid-template-columns: repeat(4, 1fr); }
        .card {
            background: var(--bg-card);
            border-radius: var(--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); }
        .card-img { width: 100%; height: 200px; object-fit: cover; border-radius: 0; }
        .card-body { padding: 24px; }
        .card-body h3 { font-size: 1.15rem; font-weight: 600; margin-bottom: 8px; color: var(--text-primary); }
        .card-body p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }
        .card-body .card-tag {
            display: inline-block;
            padding: 4px 12px;
            background: var(--accent-light);
            color: var(--accent-hover);
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .card-body .card-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 16px;
            padding-top: 12px;
            border-top: 1px solid var(--border-color);
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        /* ===== 特色板块 ===== */
        .feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px,1fr)); gap: 28px; }
        .feature-item {
            text-align: center;
            padding: 36px 24px;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .feature-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
        .feature-item .icon-wrap {
            width: 64px; height: 64px;
            margin: 0 auto 16px;
            background: var(--accent-light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--accent);
        }
        .feature-item h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
        .feature-item p { font-size: 0.9rem; color: var(--text-secondary); }
        /* ===== 流程板块 ===== */
        .process-steps { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; }
        .process-step {
            text-align: center;
            position: relative;
        }
        .process-step .step-num {
            width: 48px; height: 48px;
            background: var(--accent);
            color: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            font-weight: 700;
            margin: 0 auto 12px;
        }
        .process-step h4 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
        .process-step p { font-size: 0.85rem; color: var(--text-secondary); }
        .process-step::after {
            content: '→';
            position: absolute;
            right: -16px;
            top: 12px;
            font-size: 1.4rem;
            color: var(--accent);
            opacity: 0.5;
        }
        .process-step:last-child::after { display: none; }
        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: 20px 0;
        }
        .faq-item:first-child { border-top: 1px solid var(--border-color); }
        .faq-q {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-primary);
        }
        .faq-q i { transition: var(--transition); color: var(--accent); }
        .faq-q.open i { transform: rotate(180deg); }
        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: var(--transition);
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-a.open { max-height: 300px; padding-top: 12px; }
        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            color: #fff;
            text-align: center;
            padding: 80px 0;
        }
        .cta-section h2 { font-size: 2.2rem; font-weight: 700; margin-bottom: 16px; }
        .cta-section p { color: rgba(255,255,255,0.7); max-width: 560px; margin: 0 auto 32px; font-size: 1.05rem; }
        /* ===== 内容列表 ===== */
        .content-list { display: flex; flex-direction: column; gap: 16px; }
        .content-item {
            display: flex;
            gap: 20px;
            align-items: flex-start;
            padding: 20px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .content-item:hover { border-color: var(--accent); box-shadow: var(--shadow); }
        .content-item .ci-img { width: 100px; height: 70px; object-fit: cover; border-radius: var(--radius-sm); flex-shrink: 0; }
        .content-item .ci-body { flex: 1; }
        .content-item .ci-body h4 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
        .content-item .ci-body p { font-size: 0.85rem; color: var(--text-secondary); }
        .content-item .ci-body .ci-meta { font-size: 0.75rem; color: var(--text-muted); margin-top: 6px; display: flex; gap: 16px; }
        .content-item .ci-body .ci-meta span { display: flex; align-items: center; gap: 4px; }
        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.6);
            padding: 48px 0 32px;
            margin-top: auto;
        }
        .footer .container { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 36px; }
        .footer h4 { color: #fff; font-size: 1rem; font-weight: 600; margin-bottom: 16px; }
        .footer p, .footer a { font-size: 0.88rem; color: rgba(255,255,255,0.5); line-height: 1.8; }
        .footer a:hover { color: var(--accent); }
        .footer .footer-brand .logo-text { font-size: 1.3rem; font-weight: 700; color: var(--accent); margin-bottom: 8px; }
        .footer-bottom {
            margin-top: 36px;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.06);
            text-align: center;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.3);
        }
        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .card-grid-4 { grid-template-columns: repeat(2,1fr); }
            .process-steps { grid-template-columns: repeat(2,1fr); }
            .process-step:nth-child(2)::after { display: none; }
            .footer .container { grid-template-columns: repeat(2,1fr); }
        }
        @media (max-width: 768px) {
            .side-nav { display: none; }
            .mobile-topbar { display: flex; }
            .main-content { margin-left: 0; padding-top: var(--header-height); }
            .hero-section h1 { font-size: 2.2rem; }
            .hero-stats { gap: 20px; flex-wrap: wrap; }
            .card-grid-2, .card-grid-3, .card-grid-4 { grid-template-columns: 1fr; }
            .section { padding: 48px 0; }
            .section-title { font-size: 1.6rem; }
            .process-steps { grid-template-columns: 1fr 1fr; }
            .process-step::after { display: none; }
            .content-item { flex-direction: column; }
            .content-item .ci-img { width: 100%; height: 160px; }
            .footer .container { grid-template-columns: 1fr; }
            .hero-section { padding: 60px 0 48px; }
            .hero-section .hero-actions { flex-direction: column; }
            .hero-section .hero-actions .btn { width: 100%; justify-content: center; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .hero-section h1 { font-size: 1.6rem; }
            .hero-stats .stat-num { font-size: 1.4rem; }
            .feature-grid { grid-template-columns: 1fr; }
            .process-steps { grid-template-columns: 1fr; }
            .cta-section h2 { font-size: 1.5rem; }
        }
        /* ===== 工具类 ===== */
        .text-center { text-align: center; }
        .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; }
        .gap-8 { gap: 8px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--accent-light);
            color: var(--accent-hover);
        }
        .badge-secondary { background: rgba(26,42,58,0.08); color: var(--primary); }

/* roulang page: article */
/* ===== :root 设计变量 ===== */
        :root {
            --primary: #1a3c4a;
            --primary-light: #2a5c6a;
            --primary-dark: #0f2a34;
            --accent: #c9a96e;
            --accent-light: #e0c89a;
            --accent-dark: #b08a4a;
            --bg: #f7f5f1;
            --bg-card: #ffffff;
            --bg-dark: #1a2e38;
            --text: #2c2c2c;
            --text-light: #6a6a6a;
            --text-white: #f0ede8;
            --border: #e0dcd4;
            --radius: 12px;
            --radius-sm: 8px;
            --shadow: 0 8px 30px rgba(0,0,0,0.06);
            --shadow-hover: 0 16px 48px rgba(0,0,0,0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-serif: 'Georgia', 'Times New Roman', serif;
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
            --nav-width: 260px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; font-size: 16px; }
        body {
            font-family: var(--font-sans);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--accent); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        h1, h2, h3, h4, h5, h6 { font-family: var(--font-serif); font-weight: 700; line-height: 1.3; color: var(--primary-dark); }
        p { margin-bottom: 1rem; }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

        /* ===== 左侧导航 ===== */
        .app-layout { display: flex; min-height: 100vh; }
        .side-nav {
            width: var(--nav-width);
            background: var(--primary-dark);
            color: var(--text-white);
            display: flex;
            flex-direction: column;
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1000;
            padding: 32px 0 24px;
            box-shadow: 4px 0 24px rgba(0,0,0,0.2);
            transition: var(--transition);
            overflow-y: auto;
        }
        .side-nav::-webkit-scrollbar { width: 4px; }
        .side-nav::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 4px; }
        .logo-area {
            padding: 0 24px 28px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            margin-bottom: 20px;
        }
        .logo-text {
            font-size: 1.5rem;
            font-weight: 700;
            font-family: var(--font-serif);
            color: var(--accent);
            letter-spacing: 1px;
        }
        .logo-sub {
            font-size: 0.7rem;
            color: rgba(255,255,255,0.5);
            letter-spacing: 3px;
            text-transform: uppercase;
            margin-top: 2px;
        }
        .nav-list { flex: 1; padding: 0 12px; }
        .nav-list li { margin-bottom: 4px; }
        .nav-list a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.7);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
        }
        .nav-list a i { width: 20px; text-align: center; font-size: 1rem; color: var(--accent); opacity: 0.7; }
        .nav-list a:hover { background: rgba(201,169,110,0.15); color: var(--accent-light); }
        .nav-list a.active { background: rgba(201,169,110,0.2); color: var(--accent); font-weight: 600; }
        .nav-list a.active i { opacity: 1; }
        .nav-footer {
            padding: 20px 24px 0;
            font-size: 0.7rem;
            color: rgba(255,255,255,0.3);
            border-top: 1px solid rgba(255,255,255,0.06);
            margin-top: 16px;
            line-height: 1.6;
        }

        /* ===== 右侧主内容 ===== */
        .main-content {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== 文章详情 ===== */
        .article-hero {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            padding: 60px 0 50px;
            position: relative;
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .article-hero .container { position: relative; z-index: 1; }
        .article-hero .breadcrumb {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.6);
            margin-bottom: 20px;
        }
        .article-hero .breadcrumb a { color: var(--accent-light); }
        .article-hero .breadcrumb a:hover { color: var(--accent); }
        .article-hero .breadcrumb span { color: rgba(255,255,255,0.8); }
        .article-hero h1 {
            font-size: 2.2rem;
            color: #fff;
            max-width: 800px;
            line-height: 1.3;
            margin-bottom: 16px;
            text-shadow: 0 2px 12px rgba(0,0,0,0.3);
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.7);
        }
        .article-meta .tag {
            background: var(--accent);
            color: var(--primary-dark);
            padding: 2px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
        }
        .article-meta i { margin-right: 6px; color: var(--accent); }

        .article-body {
            flex: 1;
            padding: 48px 0 60px;
        }
        .article-body .container {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
        }
        .article-content {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 40px;
            box-shadow: var(--shadow);
        }
        .article-content p { font-size: 1.05rem; line-height: 1.9; color: var(--text); }
        .article-content h2 { font-size: 1.5rem; margin: 32px 0 16px; color: var(--primary-dark); }
        .article-content h3 { font-size: 1.2rem; margin: 24px 0 12px; color: var(--primary); }
        .article-content ul, .article-content ol { margin: 16px 0; padding-left: 24px; list-style: disc; }
        .article-content li { margin-bottom: 8px; font-size: 1.05rem; line-height: 1.8; }
        .article-content blockquote {
            border-left: 4px solid var(--accent);
            background: rgba(201,169,110,0.08);
            padding: 16px 24px;
            margin: 24px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-style: italic;
            color: var(--text-light);
        }
        .article-content img { margin: 24px 0; border-radius: var(--radius-sm); box-shadow: var(--shadow); }
        .article-content .highlight {
            background: linear-gradient(135deg, rgba(201,169,110,0.12), rgba(201,169,110,0.04));
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--accent-light);
            margin: 24px 0;
        }

        /* 文章导航（上下篇） */
        .article-nav {
            display: flex;
            justify-content: space-between;
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
            gap: 16px;
        }
        .article-nav a {
            flex: 1;
            padding: 16px 20px;
            background: var(--bg);
            border-radius: var(--radius-sm);
            transition: var(--transition);
            border: 1px solid transparent;
        }
        .article-nav a:hover { border-color: var(--accent); background: rgba(201,169,110,0.06); }
        .article-nav .nav-label { font-size: 0.8rem; color: var(--text-light); margin-bottom: 4px; }
        .article-nav .nav-title { font-weight: 600; color: var(--primary); font-size: 0.95rem; }
        .article-nav .nav-right { text-align: right; }
        .article-nav .nav-disabled {
            opacity: 0.4;
            pointer-events: none;
        }

        /* 侧边栏 */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px;
            box-shadow: var(--shadow);
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--accent);
            display: inline-block;
        }
        .sidebar-card ul li { margin-bottom: 10px; }
        .sidebar-card ul li a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text);
            font-size: 0.9rem;
            padding: 6px 0;
            border-bottom: 1px solid var(--border);
        }
        .sidebar-card ul li a:hover { color: var(--accent); padding-left: 4px; }
        .sidebar-card ul li a i { color: var(--accent); font-size: 0.8rem; width: 16px; }
        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            color: #fff;
            padding: 32px 28px;
            border-radius: var(--radius);
            text-align: center;
        }
        .sidebar-cta h3 { color: var(--accent); border-bottom: none; font-size: 1.2rem; margin-bottom: 12px; }
        .sidebar-cta p { color: rgba(255,255,255,0.8); font-size: 0.9rem; margin-bottom: 20px; }
        .sidebar-cta .btn {
            display: inline-block;
            background: var(--accent);
            color: var(--primary-dark);
            padding: 12px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
        }
        .sidebar-cta .btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(201,169,110,0.35); }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary-dark);
            color: var(--text-white);
            padding: 60px 0 0;
            margin-top: auto;
        }
        .footer .container {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
        }
        .footer .logo-text { color: var(--accent); font-size: 1.3rem; margin-bottom: 8px; }
        .footer h4 { color: var(--accent-light); font-size: 1rem; margin-bottom: 16px; font-family: var(--font-sans); }
        .footer a { color: rgba(255,255,255,0.6); font-size: 0.9rem; display: inline-block; margin-bottom: 6px; }
        .footer a:hover { color: var(--accent); padding-left: 4px; }
        .footer p { color: rgba(255,255,255,0.6); font-size: 0.9rem; margin-bottom: 8px; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding: 20px 0;
            text-align: center;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.3);
            margin-top: 40px;
        }

        /* ===== 响应式 ===== */
        @media screen and (max-width: 1024px) {
            .side-nav { width: 220px; }
            .main-content { margin-left: 220px; }
            .article-body .container { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
            .footer .container { grid-template-columns: 1fr 1fr; gap: 32px; }
        }

        @media screen and (max-width: 768px) {
            .app-layout { flex-direction: column; }
            .side-nav {
                position: relative;
                width: 100%;
                min-height: auto;
                padding: 16px 20px;
                flex-direction: row;
                align-items: center;
                flex-wrap: wrap;
                box-shadow: 0 4px 16px rgba(0,0,0,0.15);
            }
            .logo-area { padding: 0; border: none; margin-bottom: 0; margin-right: 24px; }
            .logo-text { font-size: 1.2rem; }
            .logo-sub { display: none; }
            .nav-list { display: flex; gap: 4px; padding: 0; flex: 1; flex-wrap: wrap; }
            .nav-list li { margin-bottom: 0; }
            .nav-list a { padding: 8px 14px; font-size: 0.85rem; gap: 8px; }
            .nav-list a i { font-size: 0.85rem; }
            .nav-footer { display: none; }
            .main-content { margin-left: 0; }
            .article-hero { padding: 40px 0 32px; }
            .article-hero h1 { font-size: 1.6rem; }
            .article-body .container { grid-template-columns: 1fr; }
            .article-content { padding: 24px; }
            .article-sidebar { grid-template-columns: 1fr; }
            .article-nav { flex-direction: column; }
            .footer .container { grid-template-columns: 1fr; gap: 24px; }
            .footer { padding: 40px 0 0; }
        }

        @media screen and (max-width: 520px) {
            .side-nav { padding: 12px 16px; }
            .logo-area { margin-right: 12px; }
            .logo-text { font-size: 1rem; }
            .nav-list a { padding: 6px 10px; font-size: 0.78rem; gap: 6px; }
            .nav-list a i { font-size: 0.75rem; }
            .article-hero h1 { font-size: 1.3rem; }
            .article-content { padding: 16px; }
            .article-content p { font-size: 0.95rem; }
            .article-meta { gap: 12px; font-size: 0.8rem; }
            .sidebar-card { padding: 20px; }
        }

        /* ===== 内容未找到 ===== */
        .not-found {
            text-align: center;
            padding: 80px 20px;
        }
        .not-found i { font-size: 3rem; color: var(--accent); margin-bottom: 20px; }
        .not-found h2 { font-size: 1.8rem; margin-bottom: 12px; }
        .not-found p { color: var(--text-light); margin-bottom: 24px; }
        .not-found .btn {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            padding: 12px 32px;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition);
        }
        .not-found .btn:hover { background: var(--accent); color: var(--primary-dark); transform: translateY(-2px); }

        /* ===== 附加工具 ===== */
        .text-accent { color: var(--accent); }
        .bg-accent-light { background: rgba(201,169,110,0.08); }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a2a3a;
            --primary-light: #2c4058;
            --primary-dark: #0f1a26;
            --accent: #c9a96e;
            --accent-light: #e0c9a0;
            --accent-dark: #a88a4e;
            --bg-body: #f5f3f0;
            --bg-card: #ffffff;
            --bg-alt: #eae7e2;
            --text: #1a1a1a;
            --text-light: #6b6b6b;
            --text-muted: #9a9a9a;
            --border: #d8d4ce;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 18px;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --nav-width: 240px;
            --header-height: 72px;
            --gap: 32px;
            --gap-sm: 20px;
        }

        /* ===== 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-body);
            min-height: 100vh;
            display: flex;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--primary);
        }
        p {
            margin-bottom: 12px;
        }

        /* ===== 左侧导航 ===== */
        .side-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--primary-dark);
            color: #fff;
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            border-right: 1px solid rgba(255, 255, 255, 0.06);
            transition: var(--transition);
        }
        .side-nav .logo-area {
            padding: 28px 20px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            text-align: center;
        }
        .side-nav .logo-text {
            font-size: 22px;
            font-weight: 800;
            color: var(--accent);
            letter-spacing: 2px;
            line-height: 1.2;
        }
        .side-nav .logo-sub {
            font-size: 11px;
            color: var(--text-muted);
            letter-spacing: 3px;
            text-transform: uppercase;
            margin-top: 4px;
            opacity: 0.6;
        }
        .side-nav .nav-list {
            flex: 1;
            padding: 16px 0;
        }
        .side-nav .nav-list li a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 14px 24px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 15px;
            font-weight: 500;
            border-left: 3px solid transparent;
            transition: var(--transition);
        }
        .side-nav .nav-list li a i {
            width: 20px;
            font-size: 16px;
            text-align: center;
            color: var(--accent);
            opacity: 0.6;
            transition: var(--transition);
        }
        .side-nav .nav-list li a:hover {
            background: rgba(255, 255, 255, 0.05);
            color: #fff;
            border-left-color: var(--accent);
        }
        .side-nav .nav-list li a:hover i {
            opacity: 1;
        }
        .side-nav .nav-list li a.active {
            background: rgba(201, 169, 110, 0.12);
            color: var(--accent);
            border-left-color: var(--accent);
            font-weight: 600;
        }
        .side-nav .nav-list li a.active i {
            opacity: 1;
            color: var(--accent);
        }
        .side-nav .nav-footer {
            padding: 16px 20px 24px;
            font-size: 12px;
            color: rgba(255, 255, 255, 0.3);
            text-align: center;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            line-height: 1.6;
        }

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

        /* ===== 移动端顶部导航 ===== */
        .top-bar-mobile {
            display: none;
            background: var(--primary-dark);
            padding: 12px 20px;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 999;
        }
        .top-bar-mobile .logo-text {
            font-size: 18px;
            font-weight: 800;
            color: var(--accent);
            letter-spacing: 1px;
        }
        .top-bar-mobile .menu-toggle {
            background: none;
            border: none;
            color: #fff;
            font-size: 24px;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
            transition: var(--transition);
        }
        .top-bar-mobile .menu-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        /* ===== 移动端抽屉菜单 ===== */
        .mobile-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 998;
            opacity: 0;
            transition: opacity 0.3s;
        }
        .mobile-overlay.open {
            opacity: 1;
        }

        /* ===== Container ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--gap);
        }
        .container-fluid {
            padding: 0 var(--gap);
        }

        /* ===== Hero / Banner ===== */
        .category-banner {
            position: relative;
            padding: 80px 0 70px;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-light) 70%, #3a2a1a 100%);
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .category-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 80% 40%, rgba(201, 169, 110, 0.08) 0%, transparent 70%);
        }
        .category-banner .container {
            position: relative;
            z-index: 2;
        }
        .category-banner h1 {
            font-size: 44px;
            color: #fff;
            margin-bottom: 16px;
            font-weight: 800;
            letter-spacing: 1px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }
        .category-banner h1 span {
            color: var(--accent);
        }
        .category-banner p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.8);
            max-width: 640px;
            line-height: 1.8;
            margin-bottom: 0;
        }
        .banner-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 24px;
        }
        .banner-tags .tag {
            background: rgba(201, 169, 110, 0.2);
            border: 1px solid rgba(201, 169, 110, 0.3);
            color: var(--accent-light);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.5px;
            backdrop-filter: blur(4px);
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 70px 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-white {
            background: var(--bg-card);
        }
        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 8px;
            letter-spacing: 0.5px;
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--text-light);
            margin-bottom: 40px;
            max-width: 600px;
        }
        .section-divider {
            width: 60px;
            height: 3px;
            background: var(--accent);
            border-radius: 4px;
            margin: 12px 0 24px;
        }

        /* ===== 卡片网格 ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--gap);
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap);
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid var(--border);
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .card-image {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
            background: var(--bg-alt);
        }
        .card-body {
            padding: 20px 22px 24px;
        }
        .card-body h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--primary);
        }
        .card-body h3 a {
            color: inherit;
        }
        .card-body h3 a:hover {
            color: var(--accent);
        }
        .card-body p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
            margin-bottom: 12px;
        }
        .card-body .meta {
            font-size: 13px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .card-body .meta i {
            color: var(--accent);
            margin-right: 4px;
        }

        /* ===== 徽章 / 标签 ===== */
        .badge {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 3px 12px;
            border-radius: 30px;
            letter-spacing: 0.5px;
        }
        .badge-light {
            background: rgba(201, 169, 110, 0.15);
            color: var(--accent-dark);
        }
        .tag-sm {
            display: inline-block;
            background: var(--bg-alt);
            color: var(--text-light);
            font-size: 12px;
            padding: 2px 12px;
            border-radius: 30px;
            border: 1px solid var(--border);
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 15px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            line-height: 1.2;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(201, 169, 110, 0.35);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--border);
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }
        .btn-light {
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.25);
        }
        .btn-light:hover {
            background: rgba(255, 255, 255, 0.25);
            color: #fff;
        }

        /* ===== 流程步骤 ===== */
        .steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            padding: 30px 20px;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: var(--transition);
            position: relative;
        }
        .step-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            display: block;
            width: 44px;
            height: 44px;
            line-height: 44px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            font-size: 18px;
            font-weight: 800;
            margin: 0 auto 16px;
        }
        .step-item h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 0;
        }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
        }
        .stat-item {
            text-align: center;
            padding: 28px 16px;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
        }
        .stat-item .number {
            font-size: 38px;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.1;
        }
        .stat-item .label {
            font-size: 14px;
            color: var(--text-light);
            margin-top: 6px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--accent);
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 16px;
            color: var(--primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
        }
        .faq-question::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 13px;
            color: var(--accent);
            transition: var(--transition);
        }
        .faq-question.open::after {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.8;
            display: none;
        }
        .faq-answer.open {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
            padding: 70px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 36px;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== 联系方式 ===== */
        .contact-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap);
        }
        .contact-card {
            background: var(--bg-card);
            padding: 28px 24px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            text-align: center;
            transition: var(--transition);
        }
        .contact-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .contact-card i {
            font-size: 32px;
            color: var(--accent);
            margin-bottom: 16px;
        }
        .contact-card h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .contact-card p {
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 0;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 50px 0 0;
            margin-top: auto;
        }
        .footer .container {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
        }
        .footer .logo-text {
            font-size: 20px;
            font-weight: 800;
            color: var(--accent);
            letter-spacing: 1px;
        }
        .footer h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }
        .footer a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
            line-height: 2.2;
            transition: var(--transition);
        }
        .footer a:hover {
            color: var(--accent);
        }
        .footer p {
            font-size: 14px;
            line-height: 1.8;
            margin-bottom: 8px;
        }
        .footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 20px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.3);
            margin-top: 40px;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .contact-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer .container {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --nav-width: 0px;
                --gap: 16px;
                --gap-sm: 12px;
            }
            .side-nav {
                transform: translateX(-100%);
                width: 280px;
                box-shadow: 4px 0 40px rgba(0, 0, 0, 0.3);
            }
            .side-nav.open {
                transform: translateX(0);
            }
            .top-bar-mobile {
                display: flex;
            }
            .main-wrapper {
                margin-left: 0;
            }
            .mobile-overlay.open {
                display: block;
            }
            .category-banner {
                padding: 50px 0 40px;
                min-height: 240px;
            }
            .category-banner h1 {
                font-size: 28px;
            }
            .category-banner p {
                font-size: 15px;
            }
            .section {
                padding: 50px 0;
            }
            .section-title {
                font-size: 26px;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: var(--gap-sm);
            }
            .steps {
                grid-template-columns: 1fr 1fr;
                gap: var(--gap-sm);
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--gap-sm);
            }
            .contact-grid {
                grid-template-columns: 1fr;
                gap: var(--gap-sm);
            }
            .footer .container {
                grid-template-columns: 1fr;
                gap: 24px;
                text-align: center;
            }
            .footer .footer-bottom {
                font-size: 12px;
            }
            .cta-section h2 {
                font-size: 26px;
            }
            .banner-tags .tag {
                font-size: 12px;
                padding: 4px 12px;
            }
        }

        @media (max-width: 520px) {
            .steps {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .category-banner h1 {
                font-size: 22px;
            }
            .category-banner p {
                font-size: 14px;
            }
            .btn {
                padding: 10px 20px;
                font-size: 14px;
            }
            .card-body {
                padding: 16px 16px 20px;
            }
            .container {
                padding: 0 14px;
            }
        }

        /* ===== 工具类 ===== */
        .text-center {
            text-align: center;
        }
        .mt-12 {
            margin-top: 12px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-40 {
            margin-top: 40px;
        }
        .mb-0 {
            margin-bottom: 0;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .gap-12 {
            gap: 12px;
        }
        .gap-16 {
            gap: 16px;
        }