/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --primary-gradient: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #3b82f6 100%);
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --accent-light: #fef3c7;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-muted: #f1f5f9;
            --bg-dark: #0f172a;
            --text: #1e293b;
            --text-medium: #475569;
            --text-light: #64748b;
            --text-white: #f8fafc;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.15);
            --radius-sm: 6px;
            --radius: 10px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

        /* ===== 基础 Reset ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        button { font-family: inherit; cursor: pointer; border: none; background: none; font-size: 1rem; }
        input, textarea { font-family: inherit; font-size: 1rem; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        h1 { font-size: 2.75rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.375rem; }
        h4 { font-size: 1.125rem; }
        p { margin-bottom: 0.5rem; color: var(--text-medium); }
        :focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: var(--radius-sm); }

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

        /* ===== 头部与导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled { box-shadow: var(--shadow-md); }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo { font-size: 1.5rem; font-weight: 800; color: var(--primary); letter-spacing: -0.5px; }
        .logo span { color: var(--text); }
        .logo i { margin-right: 6px; font-size: 1.3rem; }
        .nav-list { display: flex; align-items: center; gap: 4px; }
        .nav-list a {
            display: block;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-medium);
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a:hover { color: var(--primary); background: var(--primary-light); }
        .nav-list a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 2px;
            background: var(--primary);
        }
        .nav-toggle {
            display: none;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            color: var(--text);
            font-size: 1.4rem;
            transition: background var(--transition);
        }
        .nav-toggle:hover { background: var(--bg-muted); }
        @media (max-width: 768px) {
            .nav-toggle { display: flex; }
            .nav-list {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 24px;
                gap: 6px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: all var(--transition);
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-list a { width: 100%; padding: 12px 16px; font-size: 1rem; }
            .nav-list a.active::after { display: none; }
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 0.95rem;
            line-height: 1.4;
            transition: all var(--transition);
            border: 2px solid transparent;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-primary:active { transform: translateY(0); box-shadow: var(--shadow-sm); }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-outline:active { transform: translateY(0); }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-lg { padding: 16px 40px; font-size: 1.1rem; border-radius: var(--radius-lg); }
        .btn-sm { padding: 8px 18px; font-size: 0.85rem; border-radius: var(--radius-sm); }
        .btn i { font-size: 1.1em; }

        /* ===== Hero ===== */
        .hero {
            padding: calc(var(--header-height) + 60px) 0 80px;
            background: var(--primary-gradient);
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
            opacity: 0.3;
        }
        .hero .container { position: relative; z-index: 1; }
        .hero-content { max-width: 820px; margin: 0 auto; text-align: center; }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(4px);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 0.85rem;
            color: var(--text-white);
            font-weight: 500;
            margin-bottom: 24px;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        .hero-badge i { font-size: 0.75rem; }
        .hero h1 {
            font-size: 3.25rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 20px;
            letter-spacing: -1px;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        .hero h1 span { color: var(--accent); }
        .hero p {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 640px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }
        .hero-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; }
        .hero-actions .btn-outline { border-color: rgba(255, 255, 255, 0.6); color: #fff; }
        .hero-actions .btn-outline:hover { background: rgba(255, 255, 255, 0.15); border-color: #fff; }
        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            margin-top: 60px;
            flex-wrap: wrap;
        }
        .hero-stat { text-align: center; color: rgba(255, 255, 255, 0.9); }
        .hero-stat-number {
            font-size: 2.25rem;
            font-weight: 800;
            color: #fff;
            display: block;
            line-height: 1.2;
        }
        .hero-stat-label { font-size: 0.9rem; opacity: 0.8; margin-top: 4px; }
        @media (max-width: 768px) {
            .hero { padding: calc(var(--header-height) + 40px) 0 50px; }
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 1rem; }
            .hero-stats { gap: 24px; }
            .hero-stat-number { font-size: 1.75rem; }
        }
        @media (max-width: 520px) {
            .hero h1 { font-size: 1.65rem; }
            .hero-actions .btn { width: 100%; }
        }

        /* ===== 通用板块 ===== */
        .section { padding: 80px 0; }
        .section-header {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 56px;
        }
        .section-header h2 { margin-bottom: 12px; }
        .section-header p { font-size: 1.1rem; color: var(--text-light); }
        .section-tag {
            display: inline-block;
            padding: 4px 16px;
            border-radius: 50px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .bg-muted { background: var(--bg-muted); }
        .bg-white { background: var(--bg-white); }
        .bg-dark { background: var(--bg-dark); color: var(--text-white); }
        .bg-dark .section-header h2 { color: #fff; }
        .bg-dark .section-header p { color: var(--text-muted); }

        /* ===== 卡片 ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--primary-light);
        }
        .card-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary);
            background: var(--primary-light);
            margin-bottom: 20px;
            transition: all var(--transition);
        }
        .card:hover .card-icon { background: var(--primary); color: #fff; }
        .card h3 { margin-bottom: 10px; font-size: 1.2rem; }
        .card p { font-size: 0.95rem; color: var(--text-light); margin-bottom: 0; }

        /* ===== 网格 ===== */
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .grid-3, .grid-2 { grid-template-columns: 1fr; }
            .grid-4 { grid-template-columns: 1fr; }
            .section { padding: 56px 0; }
            .section-header { margin-bottom: 36px; }
        }

        /* ===== 标签 ===== */
        .tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--primary-light);
            color: var(--primary);
        }
        .tag-accent { background: var(--accent-light); color: var(--accent-dark); }
        .tag-muted { background: var(--bg-muted); color: var(--text-light); }

        /* ===== 分类入口板块 ===== */
        .category-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
        .category-card {
            padding: 40px 36px;
            border-radius: var(--radius-lg);
            background: var(--bg-card);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            align-items: flex-start;
        }
        .category-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--primary-light);
        }
        .category-card .card-icon { margin-bottom: 16px; }
        .category-card h3 { font-size: 1.35rem; margin-bottom: 8px; }
        .category-card p { font-size: 0.95rem; color: var(--text-light); margin-bottom: 20px; flex: 1; }
        .category-card .btn { align-self: flex-start; }
        @media (max-width: 768px) {
            .category-cards { grid-template-columns: 1fr; }
            .category-card { padding: 28px 24px; }
        }

        /* ===== 文章列表 ===== */
        .article-list { display: grid; gap: 20px; }
        .article-item {
            display: flex;
            gap: 20px;
            padding: 24px 28px;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: all var(--transition);
            align-items: flex-start;
        }
        .article-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
            transform: translateX(4px);
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-light);
            margin-bottom: 6px;
            flex-wrap: wrap;
        }
        .article-meta .tag { font-size: 0.7rem; }
        .article-item h4 {
            font-size: 1.1rem;
            margin-bottom: 6px;
            transition: color var(--transition);
        }
        .article-item:hover h4 { color: var(--primary); }
        .article-item p { font-size: 0.9rem; color: var(--text-light); margin-bottom: 0; }
        .article-date { color: var(--text-muted); font-size: 0.8rem; display: flex; align-items: center; gap: 4px; }
        .article-date i { font-size: 0.7rem; }
        .article-empty {
            text-align: center;
            padding: 48px 24px;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px dashed var(--border);
            color: var(--text-light);
        }
        .article-empty i { font-size: 2rem; margin-bottom: 12px; display: block; color: var(--text-muted); }
        @media (max-width: 768px) {
            .article-item { flex-direction: column; padding: 18px 20px; gap: 8px; }
        }

        /* ===== 流程步骤 ===== */
        .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; counter-reset: step; }
        .step-card {
            text-align: center;
            padding: 36px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            position: relative;
            transition: all var(--transition);
        }
        .step-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
        .step-card::before {
            counter-increment: step;
            content: counter(step);
            display: flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 800;
            font-size: 1.2rem;
            margin: 0 auto 16px;
            transition: all var(--transition);
        }
        .step-card:hover::before { background: var(--primary); color: #fff; }
        .step-card h4 { font-size: 1.1rem; margin-bottom: 8px; }
        .step-card p { font-size: 0.9rem; color: var(--text-light); margin-bottom: 0; }
        .step-connector { display: none; }
        @media (max-width: 1024px) {
            .steps { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .steps { grid-template-columns: 1fr; gap: 16px; }
        }

        /* ===== 数据统计 ===== */
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
        .stat-card {
            text-align: center;
            padding: 32px 16px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
        .stat-card i {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 12px;
            display: block;
        }
        .stat-card .number {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--text);
            display: block;
            line-height: 1.2;
        }
        .stat-card .label { font-size: 0.9rem; color: var(--text-light); margin-top: 4px; }
        @media (max-width: 1024px) {
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .stats-grid { grid-template-columns: 1fr; }
        }

        /* ===== 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);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); }
        .faq-question {
            width: 100%;
            padding: 20px 28px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            text-align: left;
            background: transparent;
            transition: background var(--transition);
            gap: 16px;
        }
        .faq-question:hover { background: var(--bg-muted); }
        .faq-question i { font-size: 0.85rem; color: var(--text-light); transition: transform var(--transition); flex-shrink: 0; }
        .faq-item.open .faq-question i { transform: rotate(180deg); color: var(--primary); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
        }
        .faq-answer-inner {
            padding: 0 28px 20px;
            font-size: 0.95rem;
            color: var(--text-medium);
            line-height: 1.8;
        }
        .faq-item.open .faq-answer { max-height: 400px; }
        @media (max-width: 768px) {
            .faq-question { padding: 16px 20px; font-size: 0.95rem; }
            .faq-answer-inner { padding: 0 20px 16px; }
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            background: var(--primary-gradient);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
            opacity: 0.2;
        }
        .cta-section .container { position: relative; z-index: 1; text-align: center; }
        .cta-section h2 {
            font-size: 2.25rem;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 32px;
        }
        .cta-section .btn-accent { background: #fff; color: var(--primary); border-color: #fff; }
        .cta-section .btn-accent:hover { background: rgba(255,255,255,0.9); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
        .cta-section .btn-outline { border-color: rgba(255,255,255,0.6); color: #fff; }
        .cta-section .btn-outline:hover { background: rgba(255,255,255,0.15); border-color: #fff; }
        @media (max-width: 768px) {
            .cta-section h2 { font-size: 1.6rem; }
            .cta-section p { font-size: 1rem; }
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: var(--text-muted);
            padding: 56px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo { color: #fff; margin-bottom: 12px; display: inline-block; }
        .footer-brand .logo span { color: var(--text-muted); }
        .footer-brand p { font-size: 0.9rem; color: var(--text-muted); max-width: 320px; line-height: 1.8; }
        .footer-social { display: flex; gap: 12px; margin-top: 20px; }
        .footer-social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            transition: all var(--transition);
            font-size: 1rem;
        }
        .footer-social a:hover { background: var(--primary); color: #fff; }
        .footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul a {
            font-size: 0.9rem;
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .footer-col ul a:hover { color: #fff; }
        .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;
        }
        .footer-bottom a { color: var(--text-muted); }
        .footer-bottom a:hover { color: #fff; }
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== 面包屑（备用） ===== */
        .breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: var(--text-light); padding: 16px 0; }
        .breadcrumb a { color: var(--text-light); }
        .breadcrumb a:hover { color: var(--primary); }
        .breadcrumb i { font-size: 0.6rem; color: var(--text-muted); }

        /* ===== 实用工具 ===== */
        .text-center { text-align: center; }
        .mt-8 { margin-top: 8px; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }
        .mb-16 { margin-bottom: 16px; }
        .gap-8 { gap: 8px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

        /* ===== 滚动动画 ===== */
        .fade-up { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
        .fade-up.visible { opacity: 1; transform: translateY(0); }

        /* ===== 占位适配 ===== */
        @media (max-width: 520px) {
            h1 { font-size: 1.75rem; }
            h2 { font-size: 1.5rem; }
            .hero-stat-number { font-size: 1.5rem; }
            .stat-card .number { font-size: 1.75rem; }
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1e40af;
            --primary-light: #dbeafe;
            --primary-gradient: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-muted: #f1f5f9;
            --bg-dark: #0f172a;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 16px rgba(0,0,0,0.05);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.14);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
        }
        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; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
        h1 { font-size: 2.25rem; }
        h2 { font-size: 1.75rem; }
        h3 { font-size: 1.25rem; }
        h4 { font-size: 1.125rem; }
        p { margin-bottom: 1rem; color: var(--text-secondary); }
        p:last-child { margin-bottom: 0; }
        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled { box-shadow: var(--shadow-md); }
        .header-inner {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.5px;
        }
        .logo i { color: var(--primary); font-size: 1.5rem; }
        .logo span { color: var(--primary); font-weight: 700; }
        .logo:hover { color: var(--text-primary); opacity: 0.9; }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-list a {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a:hover { color: var(--primary); background: var(--primary-light); }
        .nav-list a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 3px;
            background: var(--primary);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover { background: var(--bg-muted); }
        @media (max-width: 768px) {
            .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
            .nav-list {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                border-radius: 0 0 var(--radius-md) var(--radius-md);
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-list a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
                border-radius: var(--radius-sm);
            }
            .nav-list a.active::after { display: none; }
            .nav-list a.active { background: var(--primary-light); }
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-area {
            padding-top: calc(var(--header-height) + 32px);
            padding-bottom: 16px;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
        }
        .breadcrumb-list {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .breadcrumb-list a { color: var(--text-muted); }
        .breadcrumb-list a:hover { color: var(--primary); }
        .breadcrumb-list .sep { color: var(--border); }
        .breadcrumb-list .current { color: var(--text-secondary); font-weight: 500; }

        /* ===== Article Main ===== */
        .article-section {
            padding: 40px 0 60px;
            background: var(--bg-body);
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
        }
        .article-main { min-width: 0; }
        .article-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            padding: 40px 48px;
            border: 1px solid var(--border);
        }
        .article-header { margin-bottom: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--border-light); }
        .article-category {
            display: inline-block;
            padding: 4px 14px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 100px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            margin-bottom: 16px;
        }
        .article-title {
            font-size: 2rem;
            line-height: 1.3;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .article-meta span { display: flex; align-items: center; gap: 6px; }
        .article-meta i { font-size: 0.85rem; }
        .article-body {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text-secondary);
        }
        .article-body h2, .article-body h3, .article-body h4 {
            margin-top: 1.8em;
            margin-bottom: 0.6em;
            color: var(--text-primary);
        }
        .article-body p { margin-bottom: 1.2em; }
        .article-body ul, .article-body ol { margin-bottom: 1.2em; padding-left: 1.6em; }
        .article-body li { margin-bottom: 0.4em; list-style: disc; color: var(--text-secondary); }
        .article-body ol li { list-style: decimal; }
        .article-body img { border-radius: var(--radius-sm); margin: 1.5em 0; }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 16px 24px;
            margin: 1.5em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
        }
        .article-body a { font-weight: 500; text-decoration: underline; text-underline-offset: 2px; }
        .article-body a:hover { text-decoration: none; }
        .article-footer {
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border-light);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }
        .article-tags {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }
        .article-tags .tag {
            display: inline-block;
            padding: 4px 14px;
            background: var(--bg-muted);
            color: var(--text-secondary);
            border-radius: 100px;
            font-size: 0.8rem;
            font-weight: 500;
            transition: all var(--transition);
        }
        .article-tags .tag:hover { background: var(--primary-light); color: var(--primary); }
        .article-share {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .article-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--bg-muted);
            color: var(--text-secondary);
            font-size: 0.95rem;
            transition: all var(--transition);
        }
        .article-share a:hover { background: var(--primary); color: var(--text-white); }

        /* ===== Sidebar ===== */
        .article-sidebar { min-width: 0; }
        .sidebar-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            padding: 28px;
            border: 1px solid var(--border);
            margin-bottom: 24px;
        }
        .sidebar-card:last-child { margin-bottom: 0; }
        .sidebar-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--primary-light);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-title i { color: var(--primary); }
        .sidebar-list li { margin-bottom: 12px; }
        .sidebar-list li:last-child { margin-bottom: 0; }
        .sidebar-list a {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 10px 12px;
            border-radius: var(--radius-sm);
            background: var(--bg-muted);
            transition: all var(--transition);
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        .sidebar-list a:hover { background: var(--primary-light); color: var(--primary); }
        .sidebar-list a i { margin-top: 3px; color: var(--primary); font-size: 0.8rem; }
        .sidebar-cta {
            text-align: center;
        }
        .sidebar-cta h4 { margin-bottom: 8px; }
        .sidebar-cta p { font-size: 0.9rem; margin-bottom: 16px; }
        .sidebar-cta .btn { width: 100%; }

        /* ===== Article Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 40px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }
        .not-found-box i { font-size: 3.5rem; color: var(--text-muted); margin-bottom: 24px; }
        .not-found-box h2 { font-size: 1.75rem; margin-bottom: 12px; }
        .not-found-box p { margin-bottom: 24px; color: var(--text-muted); }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--primary-gradient);
            color: var(--text-white);
            box-shadow: 0 4px 14px rgba(37,99,235,0.30);
        }
        .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(37,99,235,0.35); color: var(--text-white); }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover { background: var(--primary); color: var(--text-white); transform: translateY(-2px); }
        .btn-sm { padding: 8px 18px; font-size: 0.85rem; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: var(--text-white);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo { color: var(--text-white); margin-bottom: 16px; }
        .footer-brand .logo i { color: var(--accent); }
        .footer-brand .logo span { color: var(--accent); }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.6); line-height: 1.7; max-width: 360px; }
        .footer-social { display: flex; gap: 12px; margin-top: 20px; }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.08);
            color: rgba(255,255,255,0.7);
            font-size: 1.1rem;
            transition: all var(--transition);
        }
        .footer-social a:hover { background: var(--primary); color: var(--text-white); transform: translateY(-2px); }
        .footer-col h4 {
            color: var(--text-white);
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 20px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li { margin-bottom: 12px; }
        .footer-col ul a {
            color: rgba(255,255,255,0.55);
            font-size: 0.9rem;
            transition: all var(--transition);
        }
        .footer-col ul a:hover { color: var(--accent); padding-left: 4px; }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding: 24px 0;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--accent); }
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .footer-brand { grid-column: 1 / -1; }
        }
        @media (max-width: 640px) {
            .footer-grid { grid-template-columns: 1fr; gap: 32px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== Responsive Article ===== */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
            .sidebar-card { margin-bottom: 0; }
        }
        @media (max-width: 768px) {
            .article-card { padding: 24px 20px; }
            .article-title { font-size: 1.5rem; }
            .article-body { font-size: 1rem; }
            .article-sidebar { grid-template-columns: 1fr; }
            .breadcrumb-area { padding-top: calc(var(--header-height) + 20px); }
        }
        @media (max-width: 480px) {
            .article-card { padding: 20px 16px; }
            .article-title { font-size: 1.3rem; }
            .article-meta { gap: 12px; font-size: 0.8rem; }
            .article-footer { flex-direction: column; align-items: flex-start; }
        }

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

/* roulang page: category1 */
/* ============================================
           设计变量
           ============================================ */
        :root {
            --primary: #1a56db;
            --primary-light: #3b82f6;
            --primary-dark: #1e40af;
            --primary-bg: #eff6ff;
            --secondary: #0ea5e9;
            --secondary-light: #7dd3fc;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --success: #10b981;
            --danger: #ef4444;
            --dark: #0f172a;
            --dark-2: #1e293b;
            --gray-900: #111827;
            --gray-800: #1f2937;
            --gray-700: #374151;
            --gray-600: #4b5563;
            --gray-500: #6b7280;
            --gray-400: #9ca3af;
            --gray-300: #d1d5db;
            --gray-200: #e5e7eb;
            --gray-100: #f3f4f6;
            --gray-50: #f9fafb;
            --white: #ffffff;
            --body-bg: #ffffff;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border-color: #e2e8f0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.16);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ============================================
           基础 Reset & Base
           ============================================ */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--body-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        a:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
            border-radius: 4px;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        button:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }

        h1 {
            font-size: clamp(2rem, 5vw, 3.2rem);
        }
        h2 {
            font-size: clamp(1.5rem, 3.5vw, 2.2rem);
        }
        h3 {
            font-size: clamp(1.15rem, 2vw, 1.5rem);
        }
        h4 {
            font-size: 1.1rem;
        }

        p {
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }
        p:last-child {
            margin-bottom: 0;
        }

        /* ============================================
           容器
           ============================================ */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ============================================
           Header / 导航
           ============================================ */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.7);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-sm);
            border-bottom-color: var(--border-color);
        }

        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--dark);
            letter-spacing: -0.3px;
            transition: opacity var(--transition);
        }
        .logo i {
            font-size: 1.6rem;
            color: var(--primary);
            transition: transform var(--transition);
        }
        .logo:hover i {
            transform: scale(1.08);
        }
        .logo:hover {
            opacity: 0.9;
            color: var(--dark);
        }
        .logo span {
            color: var(--primary);
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-list a {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: background var(--transition), color var(--transition);
            position: relative;
        }
        .nav-list a:hover {
            background: var(--gray-100);
            color: var(--text-primary);
        }
        .nav-list a.active {
            background: var(--primary-bg);
            color: var(--primary);
            font-weight: 600;
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 2px;
            background: var(--primary);
        }

        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            font-size: 1.4rem;
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--gray-100);
        }

        @media (max-width: 768px) {
            .nav-list {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                -webkit-backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-md);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: transform 0.35s ease, opacity 0.35s ease;
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-list a {
                width: 100%;
                padding: 12px 16px;
                border-radius: var(--radius-sm);
                font-size: 1.05rem;
            }
            .nav-list a.active::after {
                display: none;
            }
            .nav-list a.active {
                background: var(--primary-bg);
                color: var(--primary);
            }
            .nav-toggle {
                display: flex;
            }
            .header-inner {
                padding: 0 16px;
            }
        }

        @media (max-width: 520px) {
            :root {
                --header-height: 64px;
            }
            .logo {
                font-size: 1.15rem;
            }
            .logo i {
                font-size: 1.3rem;
            }
        }

        /* ============================================
           Hero 板块 (分类页)
           ============================================ */
        .hero-category {
            padding: calc(var(--header-height) + 48px) 0 56px;
            background: linear-gradient(135deg, #eff6ff 0%, #f0f9ff 50%, #fdf2f8 100%);
            position: relative;
            overflow: hidden;
        }
        .hero-category::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -20%;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-category::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -10%;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(14, 165, 233, 0.06) 0%, transparent 70%);
            pointer-events: none;
        }

        .hero-category .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }

        .hero-category .badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--white);
            border: 1px solid var(--border-color);
            padding: 6px 18px;
            border-radius: 100px;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--primary);
            box-shadow: var(--shadow-sm);
            margin-bottom: 20px;
        }
        .hero-category .badge i {
            font-size: 0.9rem;
        }

        .hero-category h1 {
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--dark);
        }
        .hero-category h1 span {
            color: var(--primary);
        }
        .hero-category .subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto 28px;
            line-height: 1.8;
        }
        .hero-category .meta-row {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 24px;
            flex-wrap: wrap;
            font-size: 0.9rem;
            color: var(--gray-500);
        }
        .hero-category .meta-row i {
            margin-right: 6px;
            color: var(--primary-light);
        }

        @media (max-width: 768px) {
            .hero-category {
                padding: calc(var(--header-height) + 32px) 0 40px;
            }
            .hero-category .subtitle {
                font-size: 1rem;
            }
            .hero-category .meta-row {
                gap: 12px;
                font-size: 0.82rem;
            }
        }

        /* ============================================
           通用板块标题
           ============================================ */
        .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-muted);
            font-size: 1.05rem;
        }
        .section-title .title-tag {
            display: inline-block;
            background: var(--primary-bg);
            color: var(--primary);
            font-size: 0.8rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1px;
            padding: 4px 14px;
            border-radius: 100px;
            margin-bottom: 12px;
        }

        @media (max-width: 768px) {
            .section-title {
                margin-bottom: 32px;
            }
            .section-title p {
                font-size: 0.95rem;
            }
        }

        /* ============================================
           板块通用间距
           ============================================ */
        .section-padding {
            padding: 80px 0;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 56px 0;
            }
        }
        @media (max-width: 520px) {
            .section-padding {
                padding: 40px 0;
            }
        }

        .bg-light {
            background: var(--gray-50);
        }
        .bg-primary-light {
            background: var(--primary-bg);
        }

        /* ============================================
           教程分类导航 (板块2)
           ============================================ */
        .tutorial-categories {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            margin-top: 8px;
        }
        .tutorial-cat-card {
            background: var(--white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 24px 24px;
            text-align: center;
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            cursor: pointer;
        }
        .tutorial-cat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }
        .tutorial-cat-card .icon-wrap {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: var(--primary-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            font-size: 1.6rem;
            color: var(--primary);
            transition: background var(--transition), color var(--transition);
        }
        .tutorial-cat-card:hover .icon-wrap {
            background: var(--primary);
            color: var(--white);
        }
        .tutorial-cat-card h3 {
            font-size: 1.05rem;
            margin-bottom: 6px;
        }
        .tutorial-cat-card p {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        .tutorial-cat-card .count {
            display: inline-block;
            margin-top: 12px;
            font-size: 0.78rem;
            font-weight: 600;
            color: var(--primary-light);
            background: var(--primary-bg);
            padding: 2px 12px;
            border-radius: 100px;
        }

        @media (max-width: 520px) {
            .tutorial-categories {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .tutorial-cat-card {
                padding: 20px 16px;
            }
            .tutorial-cat-card .icon-wrap {
                width: 44px;
                height: 44px;
                font-size: 1.2rem;
            }
            .tutorial-cat-card h3 {
                font-size: 0.95rem;
            }
        }
        @media (max-width: 380px) {
            .tutorial-categories {
                grid-template-columns: 1fr;
            }
        }

        /* ============================================
           文章卡片 (板块3 最新教程)
           ============================================ */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
            gap: 28px;
        }
        .article-card {
            background: var(--white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .article-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .article-card .card-img {
            height: 200px;
            background: var(--gray-100);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.8rem;
            color: var(--gray-400);
            position: relative;
            overflow: hidden;
        }
        .article-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .article-card .card-img .overlay-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(15, 23, 42, 0.75);
            backdrop-filter: blur(4px);
            color: var(--white);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 100px;
            letter-spacing: 0.3px;
        }
        .article-card .card-body {
            padding: 22px 24px 24px;
        }
        .article-card .card-body .meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        .article-card .card-body .meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .article-card .card-body h3 {
            font-size: 1.1rem;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .article-card .card-body h3 a {
            color: var(--text-primary);
        }
        .article-card .card-body h3 a:hover {
            color: var(--primary);
        }
        .article-card .card-body p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 16px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .article-card .card-body .card-footer-link {
            font-size: 0.88rem;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--transition);
        }
        .article-card .card-body .card-footer-link:hover {
            gap: 10px;
        }

        @media (max-width: 768px) {
            .article-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .article-card .card-body {
                padding: 18px 20px 20px;
            }
        }
        @media (max-width: 520px) {
            .article-card .card-img {
                height: 160px;
            }
        }

        /* ============================================
           热门排行 (板块4)
           ============================================ */
        .rank-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 780px;
            margin: 0 auto;
        }
        .rank-item {
            display: flex;
            align-items: center;
            gap: 16px;
            background: var(--white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            padding: 16px 20px;
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
        }
        .rank-item:hover {
            transform: translateX(6px);
            box-shadow: var(--shadow-sm);
            border-color: var(--primary-light);
        }
        .rank-item .rank-num {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: var(--gray-100);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.95rem;
            color: var(--text-secondary);
            flex-shrink: 0;
            transition: background var(--transition), color var(--transition);
        }
        .rank-item:nth-child(1) .rank-num {
            background: var(--accent);
            color: var(--white);
        }
        .rank-item:nth-child(2) .rank-num {
            background: var(--secondary);
            color: var(--white);
        }
        .rank-item:nth-child(3) .rank-num {
            background: var(--primary-light);
            color: var(--white);
        }
        .rank-item .rank-info {
            flex: 1;
            min-width: 0;
        }
        .rank-item .rank-info h4 {
            font-size: 0.98rem;
            font-weight: 600;
            margin-bottom: 2px;
        }
        .rank-item .rank-info p {
            font-size: 0.82rem;
            color: var(--text-muted);
            margin-bottom: 0;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .rank-item .rank-views {
            font-size: 0.8rem;
            color: var(--text-muted);
            white-space: nowrap;
            flex-shrink: 0;
        }
        .rank-item .rank-views i {
            margin-right: 4px;
            color: var(--primary-light);
        }

        @media (max-width: 520px) {
            .rank-item {
                padding: 12px 14px;
                gap: 12px;
            }
            .rank-item .rank-info h4 {
                font-size: 0.88rem;
            }
            .rank-item .rank-views {
                font-size: 0.72rem;
            }
            .rank-item .rank-num {
                width: 30px;
                height: 30px;
                font-size: 0.8rem;
            }
        }

        /* ============================================
           图文步骤流程 (板块5)
           ============================================ */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 32px;
            counter-reset: step-counter;
            position: relative;
        }
        .steps-grid::before {
            content: '';
            position: absolute;
            top: 40px;
            left: calc(240px / 2);
            right: calc(240px / 2);
            height: 2px;
            background: linear-gradient(to right, var(--primary-light), var(--secondary-light));
            z-index: 0;
        }
        @media (max-width: 1100px) {
            .steps-grid::before {
                display: none;
            }
        }
        .step-card {
            text-align: center;
            position: relative;
            z-index: 1;
            background: var(--white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 36px 24px 28px;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        .step-card .step-number {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--primary-bg);
            color: var(--primary);
            font-size: 1.4rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            border: 2px solid var(--primary-light);
            transition: background var(--transition), color var(--transition), border-color var(--transition);
        }
        .step-card:hover .step-number {
            background: var(--primary);
            color: var(--white);
            border-color: var(--primary);
        }
        .step-card h3 {
            font-size: 1.05rem;
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        @media (max-width: 768px) {
            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .step-card {
                padding: 28px 18px 22px;
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .step-card .step-number {
                width: 44px;
                height: 44px;
                font-size: 1.1rem;
            }
        }

        /* ============================================
           FAQ (板块6)
           ============================================ */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-item.open {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 18px 22px;
            font-size: 0.98rem;
            font-weight: 600;
            color: var(--text-primary);
            text-align: left;
            background: none;
            border: none;
            gap: 12px;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--gray-50);
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            font-size: 1rem;
            color: var(--primary);
            transition: transform var(--transition);
        }
        .faq-item.open .faq-icon {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 22px 18px;
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.75;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-answer a {
            color: var(--primary);
            font-weight: 500;
        }

        @media (max-width: 520px) {
            .faq-question {
                padding: 14px 16px;
                font-size: 0.9rem;
            }
            .faq-answer {
                padding: 0 16px 14px;
                font-size: 0.85rem;
            }
        }

        /* ============================================
           CTA (板块7)
           ============================================ */
        .cta-section {
            background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
            padding-top: 72px;
            padding-bottom: 72px;
        }
        .cta-section h2 {
            color: var(--white);
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.7);
            max-width: 560px;
            margin: 0 auto 28px;
            font-size: 1.05rem;
        }
        .cta-buttons {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--white);
            box-shadow: 0 4px 14px rgba(26, 86, 219, 0.35);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            color: var(--white);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(26, 86, 219, 0.45);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-outline-light {
            background: transparent;
            color: var(--white);
            border: 2px solid rgba(255, 255, 255, 0.3);
        }
        .btn-outline-light:hover {
            border-color: var(--white);
            background: rgba(255, 255, 255, 0.08);
            color: var(--white);
            transform: translateY(-2px);
        }
        .btn-outline-light:active {
            transform: translateY(0);
        }
        .btn-sm {
            padding: 10px 22px;
            font-size: 0.85rem;
        }

        @media (max-width: 520px) {
            .cta-section .container {
                padding-top: 48px;
                padding-bottom: 48px;
            }
            .btn {
                padding: 12px 24px;
                font-size: 0.88rem;
            }
            .cta-buttons {
                gap: 12px;
            }
        }

        /* ============================================
           页脚
           ============================================ */
        .site-footer {
            background: var(--dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            color: var(--white);
            margin-bottom: 16px;
        }
        .footer-brand .logo i {
            color: var(--primary-light);
        }
        .footer-brand .logo span {
            color: var(--primary-light);
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.55);
            line-height: 1.7;
            margin-bottom: 20px;
            max-width: 320px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.6);
            font-size: 1.1rem;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: var(--white);
            transform: translateY(-3px);
        }

        .footer-col h4 {
            color: var(--white);
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 18px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.88rem;
            transition: color var(--transition), padding-left var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--white);
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.6);
        }
        .footer-bottom a:hover {
            color: var(--white);
        }

        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .site-footer {
                padding: 40px 0 0;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-brand p {
                max-width: 100%;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ============================================
           实用工具类
           ============================================ */
        .text-center {
            text-align: center;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mt-40 {
            margin-top: 40px;
        }
        .mb-8 {
            margin-bottom: 8px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }

        /* ============================================
           空状态 / 额外
           ============================================ */
        .placeholder-img {
            background: linear-gradient(135deg, var(--gray-100), var(--gray-200));
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--gray-400);
            font-size: 2.4rem;
        }

        /* ============================================
           打印 & 可访问性
           ============================================ */
        @media print {
            .site-header,
            .site-footer,
            .nav-toggle,
            .cta-section {
                display: none !important;
            }
            .hero-category {
                padding-top: 20px;
            }
            body {
                font-size: 12px;
            }
        }

        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border-width: 0;
        }

/* roulang page: category2 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --secondary: #0f172a;
            --secondary-light: #1e293b;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --success: #10b981;
            --danger: #ef4444;
            --warning: #f59e0b;
            
            --bg-body: #ffffff;
            --bg-section: #f8fafc;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-dark-section: #1e293b;
            
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-light: #94a3b8;
            --text-white: #ffffff;
            --text-link: #2563eb;
            
            --border-color: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
            --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --container-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--text-link);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea, select { font-family: inherit; font-size: inherit; }
        ul { list-style: none; }
        .container {
            width: 100%;
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 15px;
            line-height: 1.4;
            border: 2px solid transparent;
            cursor: pointer;
            transition: all var(--transition);
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--text-white);
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            color: var(--text-white);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
        }
        .btn-primary:active { transform: translateY(0); box-shadow: none; }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: var(--text-white);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.25);
        }
        .btn-outline:active { transform: translateY(0); }
        .btn-accent {
            background: var(--accent);
            color: var(--text-white);
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            color: var(--text-white);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.35);
        }
        .btn-lg { padding: 16px 36px; font-size: 17px; border-radius: var(--radius-md); }
        .btn-sm { padding: 8px 18px; font-size: 13px; }
        .btn:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; }

        /* ===== 标签 / 徽章 ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 13px;
            font-weight: 600;
            line-height: 1.4;
            background: var(--primary-bg);
            color: var(--primary);
        }
        .badge-success { background: #ecfdf5; color: #059669; }
        .badge-warning { background: #fffbeb; color: #d97706; }
        .badge-danger { background: #fef2f2; color: #dc2626; }
        .badge-info { background: #eef2ff; color: #4f46e5; }

        /* ===== Header & Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .site-header.scrolled { box-shadow: var(--shadow-md); }
        .header-inner {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 24px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.5px;
        }
        .logo i { color: var(--primary); font-size: 26px; }
        .logo span { color: var(--primary); }
        .logo:hover { color: var(--text-primary); }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a:hover {
            color: var(--primary);
            background: var(--primary-bg);
        }
        .nav-list a.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 3px;
            background: var(--primary);
        }
        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            border: none;
            background: transparent;
            font-size: 22px;
            color: var(--text-primary);
            cursor: pointer;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover { background: var(--bg-section); }
        .nav-toggle:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; }

        /* ===== 移动端导航 ===== */
        @media (max-width: 768px) {
            .nav-toggle { display: flex; align-items: center; justify-content: center; }
            .nav-list {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--bg-body);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                visibility: hidden;
                transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
                z-index: 999;
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .nav-list a {
                width: 100%;
                padding: 12px 16px;
                font-size: 16px;
                border-radius: var(--radius-sm);
            }
            .nav-list a.active::after { display: none; }
            .nav-list a.active { background: var(--primary-bg); }
        }

        /* ===== 页面标题区 ===== */
        .page-hero {
            padding: 140px 0 64px;
            background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 100%);
            border-bottom: 1px solid var(--border-color);
        }
        .page-hero-inner {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
            text-align: center;
        }
        .page-hero .badge { margin-bottom: 16px; }
        .page-hero h1 {
            font-size: 42px;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -1px;
            color: var(--text-primary);
            margin-bottom: 16px;
        }
        .page-hero h1 i { color: var(--primary); margin-right: 10px; }
        .page-hero p {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }
        .page-hero .hero-meta {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 24px;
            flex-wrap: wrap;
            font-size: 14px;
            color: var(--text-light);
        }
        .page-hero .hero-meta span { display: flex; align-items: center; gap: 6px; }

        /* ===== 板块通用 ===== */
        .section {
            padding: 80px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-header .badge { margin-bottom: 12px; }
        .section-header h2 {
            font-size: 34px;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .section-header p {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto;
            line-height: 1.6;
        }
        .section-light { background: var(--bg-section); }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-dark .section-header h2 { color: var(--text-white); }
        .section-dark .section-header p { color: var(--text-light); }

        /* ===== 卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            padding: 32px 28px;
            transition: all var(--transition);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .card .card-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            background: var(--primary-bg);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 18px;
            transition: all var(--transition);
        }
        .card:hover .card-icon { background: var(--primary); color: var(--text-white); }
        .card h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .card .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 16px;
        }
        .card .card-tags span {
            padding: 2px 12px;
            border-radius: 100px;
            font-size: 12px;
            font-weight: 500;
            background: var(--bg-section);
            color: var(--text-secondary);
        }

        /* ===== 步骤 / 流程 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            padding: 36px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            position: relative;
            transition: all var(--transition);
        }
        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            display: block;
            width: 44px;
            height: 44px;
            line-height: 44px;
            border-radius: 50%;
            background: var(--primary-bg);
            color: var(--primary);
            font-size: 18px;
            font-weight: 800;
            margin: 0 auto 16px;
            transition: all var(--transition);
        }
        .step-item:hover::before { background: var(--primary); color: var(--text-white); }
        .step-item h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .step-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== 对比 / 列表 ===== */
        .compare-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        .compare-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            padding: 36px 32px;
            transition: all var(--transition);
        }
        .compare-card:hover { box-shadow: var(--shadow-md); }
        .compare-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .compare-card ul li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 15px;
            color: var(--text-secondary);
        }
        .compare-card ul li:last-child { border-bottom: none; }
        .compare-card ul li i { color: var(--success); margin-top: 3px; flex-shrink: 0; }
        .compare-card ul li i.fa-times { color: var(--danger); }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); }
        .faq-question {
            width: 100%;
            padding: 18px 24px;
            background: transparent;
            border: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            text-align: left;
            transition: all var(--transition);
        }
        .faq-question:hover { color: var(--primary); }
        .faq-question i { transition: transform var(--transition); color: var(--text-light); font-size: 14px; }
        .faq-item.open .faq-question i { transform: rotate(180deg); color: var(--primary); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .faq-answer-inner {
            padding: 0 24px 20px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .faq-answer-inner a { color: var(--primary); text-decoration: underline; }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--primary) 0%, #1d4ed8 100%);
            color: var(--text-white);
            text-align: center;
        }
        .cta-section h2 {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .cta-section p {
            font-size: 18px;
            opacity: 0.9;
            max-width: 560px;
            margin: 0 auto 32px;
            line-height: 1.6;
        }
        .cta-section .btn { background: var(--text-white); color: var(--primary); border-color: var(--text-white); }
        .cta-section .btn:hover { background: transparent; color: var(--text-white); border-color: var(--text-white); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }

        /* ===== 统计数字 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            padding: 32px 16px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
        }
        .stat-item .stat-number {
            font-size: 40px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stat-item .stat-label {
            font-size: 15px;
            color: var(--text-secondary);
        }
        .section-dark .stat-item { background: var(--bg-dark-section); border-color: #334155; }
        .section-dark .stat-item .stat-number { color: var(--accent); }
        .section-dark .stat-item .stat-label { color: var(--text-light); }

        /* ===== 内容列表 ===== */
        .content-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .content-item {
            display: flex;
            gap: 16px;
            padding: 20px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            align-items: flex-start;
        }
        .content-item:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            border-color: transparent;
        }
        .content-item .item-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: var(--primary-bg);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            flex-shrink: 0;
        }
        .content-item .item-text h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 4px;
            color: var(--text-primary);
        }
        .content-item .item-text p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: var(--text-light);
            padding: 60px 0 0;
        }
        .site-footer .logo { color: var(--text-white); margin-bottom: 16px; }
        .site-footer .logo span { color: var(--primary-light); }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid #1e293b;
        }
        .footer-brand p { font-size: 14px; line-height: 1.7; color: var(--text-light); margin-bottom: 20px; max-width: 340px; }
        .footer-social { display: flex; gap: 12px; }
        .footer-social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: #1e293b;
            color: var(--text-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            transition: all var(--transition);
        }
        .footer-social a:hover { background: var(--primary); color: var(--text-white); transform: translateY(-2px); }
        .footer-col h4 {
            color: var(--text-white);
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a {
            color: var(--text-light);
            font-size: 14px;
            transition: all var(--transition);
        }
        .footer-col ul li a:hover { color: var(--primary-light); padding-left: 4px; }
        .footer-bottom {
            padding: 24px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-light);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a { color: var(--text-light); text-decoration: underline; }
        .footer-bottom a:hover { color: var(--primary-light); }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .card-grid { grid-template-columns: repeat(2, 1fr); }
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .content-list { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .page-hero h1 { font-size: 34px; }
            .section-header h2 { font-size: 28px; }
        }
        @media (max-width: 768px) {
            .page-hero { padding: 110px 0 48px; }
            .page-hero h1 { font-size: 28px; }
            .page-hero p { font-size: 16px; }
            .section { padding: 56px 0; }
            .section-header { margin-bottom: 36px; }
            .section-header h2 { font-size: 24px; }
            .card-grid { grid-template-columns: 1fr; gap: 20px; }
            .steps-grid { grid-template-columns: 1fr; gap: 16px; }
            .compare-grid { grid-template-columns: 1fr; gap: 20px; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .content-list { gap: 16px; }
            .footer-grid { grid-template-columns: 1fr; gap: 32px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .stat-item .stat-number { font-size: 32px; }
            .cta-section h2 { font-size: 26px; }
            .cta-section p { font-size: 16px; }
            .hero-meta { flex-direction: column; gap: 8px !important; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .header-inner { padding: 0 16px; }
            .page-hero h1 { font-size: 24px; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
            .stat-item { padding: 20px 12px; }
            .stat-item .stat-number { font-size: 28px; }
            .card { padding: 24px 20px; }
            .compare-card { padding: 24px 20px; }
            .content-item { padding: 16px; }
            .faq-question { padding: 14px 16px; font-size: 15px; }
            .faq-answer-inner { padding: 0 16px 16px; }
        }

        /* ===== 辅助 ===== */
        .text-center { text-align: center; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }
        .gap-12 { gap: 12px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .flex-wrap { flex-wrap: wrap; }

        /* ===== :focus-visible 全局 ===== */
        :focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; }