/* roulang page: index */
:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --accent: #16a34a;
            --accent-dark: #15803d;
            --warm: #eab308;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --text-body: #1e293b;
            --text-muted: #64748b;
            --border-light: #e2e8f0;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body { font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif; background: var(--bg-body); color: var(--text-body); line-height: 1.7; }
        a { text-decoration: none; color: inherit; transition: color 0.2s; }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; }

        .container { max-width: 1280px; margin: 0 auto; padding: 0 1.5rem; }
        .container-narrow { max-width: 960px; margin: 0 auto; padding: 0 1.5rem; }

        /* Left Sidebar Layout */
        .layout-sidebar { display: flex; min-height: 100vh; }
        .sidebar { width: 260px; flex-shrink: 0; background: #ffffff; border-right: 1px solid var(--border-light); position: fixed; top: 0; left: 0; height: 100vh; z-index: 100; display: flex; flex-direction: column; box-shadow: 2px 0 12px rgba(0,0,0,0.04); transition: transform 0.3s ease; }
        .sidebar-brand { padding: 1.75rem 1.5rem 1.25rem; border-bottom: 1px solid var(--border-light); }
        .sidebar-brand .logo { font-size: 1.35rem; font-weight: 700; color: var(--primary); letter-spacing: 0.5px; line-height: 1.3; }
        .sidebar-brand .logo span { color: var(--accent); }
        .sidebar-brand .subtitle { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.25rem; }
        .sidebar-nav { flex: 1; padding: 1.25rem 0.75rem; overflow-y: auto; }
        .sidebar-nav a { display: flex; align-items: center; gap: 0.75rem; padding: 0.7rem 1rem; border-radius: var(--radius-sm); color: var(--text-muted); font-size: 0.95rem; font-weight: 500; transition: all 0.2s; margin-bottom: 0.25rem; }
        .sidebar-nav a i { width: 1.25rem; text-align: center; font-size: 1rem; }
        .sidebar-nav a:hover { background: var(--primary-light); color: var(--primary); }
        .sidebar-nav a.active { background: var(--primary); color: #ffffff; box-shadow: 0 2px 8px rgba(37,99,235,0.25); }
        .sidebar-nav .nav-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 1px; color: #94a3b8; padding: 1rem 1rem 0.5rem; font-weight: 600; }
        .sidebar-footer { padding: 1rem 1.5rem; border-top: 1px solid var(--border-light); font-size: 0.75rem; color: #94a3b8; text-align: center; }
        .main-content { margin-left: 260px; flex: 1; min-height: 100vh; }

        /* Mobile Header */
        .mobile-header { display: none; background: #ffffff; padding: 0.75rem 1.25rem; border-bottom: 1px solid var(--border-light); position: sticky; top: 0; z-index: 99; box-shadow: 0 1px 4px rgba(0,0,0,0.04); }
        .mobile-header .logo { font-size: 1.15rem; font-weight: 700; color: var(--primary); }
        .mobile-header .logo span { color: var(--accent); }
        .mobile-menu-btn { background: none; border: none; font-size: 1.4rem; color: var(--text-body); cursor: pointer; padding: 0.25rem; }
        .mobile-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 99; }

        /* Hero */
        .hero { position: relative; padding: 4rem 2rem 4rem; background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #1d4ed8 100%); overflow: hidden; min-height: 420px; display: flex; align-items: center; }
        .hero::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.png') center/cover no-repeat; opacity: 0.15; }
        .hero::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 6px; background: linear-gradient(90deg, var(--accent), var(--warm), var(--primary)); }
        .hero-content { position: relative; z-index: 2; max-width: 720px; }
        .hero h1 { font-size: 2.75rem; font-weight: 800; color: #ffffff; line-height: 1.2; margin-bottom: 1rem; letter-spacing: -0.5px; }
        .hero h1 span { color: #fde047; }
        .hero p { font-size: 1.1rem; color: rgba(255,255,255,0.85); max-width: 560px; margin-bottom: 2rem; line-height: 1.7; }
        .hero-badge { display: inline-block; background: rgba(255,255,255,0.15); backdrop-filter: blur(4px); color: #fff; padding: 0.3rem 1rem; border-radius: 999px; font-size: 0.8rem; margin-bottom: 1.25rem; border: 1px solid rgba(255,255,255,0.2); }
        .hero .btn-group { display: flex; flex-wrap: wrap; gap: 1rem; }
        .hero .btn-primary { display: inline-flex; align-items: center; gap: 0.5rem; background: #ffffff; color: var(--primary-dark); padding: 0.85rem 2rem; border-radius: 999px; font-weight: 600; font-size: 1rem; transition: all 0.25s; box-shadow: 0 4px 14px rgba(0,0,0,0.15); }
        .hero .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); background: #fefce8; }
        .hero .btn-outline { display: inline-flex; align-items: center; gap: 0.5rem; background: transparent; color: #ffffff; padding: 0.85rem 2rem; border-radius: 999px; font-weight: 500; font-size: 1rem; border: 2px solid rgba(255,255,255,0.6); transition: all 0.25s; }
        .hero .btn-outline:hover { background: rgba(255,255,255,0.12); border-color: #ffffff; transform: translateY(-2px); }

        /* Section Common */
        .section { padding: 4.5rem 0; }
        .section-title { font-size: 2rem; font-weight: 700; color: var(--text-body); margin-bottom: 0.75rem; letter-spacing: -0.3px; }
        .section-subtitle { font-size: 1.05rem; color: var(--text-muted); max-width: 600px; margin-bottom: 2.5rem; line-height: 1.6; }
        .section-divider { width: 60px; height: 4px; background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: 2px; margin-bottom: 1.25rem; }

        /* Cards */
        .card { background: var(--bg-card); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); border: 1px solid var(--border-light); transition: all 0.3s; overflow: hidden; }
        .card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
        .card-img { width: 100%; height: 200px; object-fit: cover; }
        .card-body { padding: 1.5rem; }
        .card-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--text-body); }
        .card-text { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }
        .card-tag { display: inline-block; background: var(--primary-light); color: var(--primary); font-size: 0.7rem; padding: 0.15rem 0.65rem; border-radius: 999px; font-weight: 500; margin-bottom: 0.75rem; }

        /* Grid */
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.75rem; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.75rem; }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

        /* Feature blocks */
        .feature-icon { width: 56px; height: 56px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; color: #fff; margin-bottom: 1rem; }
        .feature-icon.blue { background: linear-gradient(135deg, #3b82f6, #1d4ed8); }
        .feature-icon.green { background: linear-gradient(135deg, #22c55e, #15803d); }
        .feature-icon.amber { background: linear-gradient(135deg, #f59e0b, #b45309); }
        .feature-icon.purple { background: linear-gradient(135deg, #a855f7, #7c3aed); }

        /* Stats */
        .stat-card { text-align: center; padding: 2rem 1.5rem; background: var(--bg-card); border-radius: var(--radius-md); border: 1px solid var(--border-light); box-shadow: var(--shadow-sm); }
        .stat-number { font-size: 2.5rem; font-weight: 800; color: var(--primary); line-height: 1.1; }
        .stat-label { font-size: 0.9rem; color: var(--text-muted); margin-top: 0.35rem; }

        /* FAQ */
        .faq-item { border-bottom: 1px solid var(--border-light); padding: 1.25rem 0; }
        .faq-question { display: flex; justify-content: space-between; align-items: center; cursor: pointer; font-weight: 600; font-size: 1.05rem; color: var(--text-body); }
        .faq-question i { color: var(--text-muted); transition: transform 0.3s; }
        .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease; color: var(--text-muted); font-size: 0.95rem; line-height: 1.7; }
        .faq-item.open .faq-answer { max-height: 300px; padding-top: 0.75rem; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }

        /* CTA */
        .cta-section { background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 50%, #2563eb 100%); padding: 4rem 2rem; text-align: center; position: relative; overflow: hidden; }
        .cta-section::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.png') center/cover no-repeat; opacity: 0.1; }
        .cta-section .cta-content { position: relative; z-index: 2; max-width: 600px; margin: 0 auto; }
        .cta-section h2 { font-size: 2rem; font-weight: 700; color: #ffffff; margin-bottom: 0.75rem; }
        .cta-section p { color: rgba(255,255,255,0.85); margin-bottom: 2rem; font-size: 1.05rem; }
        .cta-section .btn-cta { display: inline-flex; align-items: center; gap: 0.5rem; background: #fde047; color: #1e3a8a; padding: 0.9rem 2.5rem; border-radius: 999px; font-weight: 700; font-size: 1.05rem; transition: all 0.25s; box-shadow: 0 4px 16px rgba(0,0,0,0.15); }
        .cta-section .btn-cta:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(0,0,0,0.2); background: #fef08a; }

        /* Footer */
        .footer { background: #0f172a; color: #cbd5e1; padding: 3.5rem 0 2rem; }
        .footer-brand { font-size: 1.25rem; font-weight: 700; color: #ffffff; margin-bottom: 0.5rem; }
        .footer-brand span { color: #60a5fa; }
        .footer-desc { font-size: 0.85rem; color: #94a3b8; max-width: 300px; line-height: 1.6; }
        .footer-links { display: flex; flex-wrap: wrap; gap: 1.5rem; margin-top: 0.5rem; }
        .footer-links a { font-size: 0.85rem; color: #94a3b8; transition: color 0.2s; }
        .footer-links a:hover { color: #60a5fa; }
        .footer-bottom { border-top: 1px solid #1e293b; padding-top: 1.5rem; margin-top: 2rem; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; font-size: 0.8rem; color: #64748b; }
        .footer-bottom a { color: #94a3b8; }
        .footer-bottom a:hover { color: #60a5fa; }

        /* Post list item */
        .post-item { display: flex; gap: 1.25rem; padding: 1.25rem 0; border-bottom: 1px solid var(--border-light); align-items: flex-start; }
        .post-item:last-child { border-bottom: none; }
        .post-thumb { width: 120px; height: 80px; border-radius: var(--radius-sm); object-fit: cover; flex-shrink: 0; background: var(--border-light); }
        .post-info { flex: 1; }
        .post-title { font-size: 1.05rem; font-weight: 600; color: var(--text-body); margin-bottom: 0.25rem; transition: color 0.2s; }
        .post-title:hover { color: var(--primary); }
        .post-meta { font-size: 0.8rem; color: var(--text-muted); display: flex; gap: 1rem; flex-wrap: wrap; }
        .post-meta .tag { background: var(--primary-light); color: var(--primary); padding: 0.1rem 0.5rem; border-radius: 999px; font-size: 0.7rem; }

        /* Empty state */
        .empty-state { text-align: center; padding: 3rem 1rem; color: var(--text-muted); }
        .empty-state i { font-size: 3rem; margin-bottom: 1rem; opacity: 0.5; }

        /* Responsive */
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
        }

        @media (max-width: 768px) {
            .sidebar { transform: translateX(-100%); }
            .sidebar.open { transform: translateX(0); }
            .mobile-header { display: flex; justify-content: space-between; align-items: center; }
            .mobile-overlay.active { display: block; }
            .main-content { margin-left: 0; }
            .hero { padding: 3rem 1.25rem; min-height: auto; }
            .hero h1 { font-size: 1.75rem; }
            .hero p { font-size: 0.95rem; }
            .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
            .section { padding: 3rem 0; }
            .section-title { font-size: 1.5rem; }
            .post-item { flex-direction: column; }
            .post-thumb { width: 100%; height: 180px; }
            .stat-number { font-size: 2rem; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-section { padding: 3rem 1.25rem; }
            .cta-section h2 { font-size: 1.5rem; }
            .sidebar-brand .logo { font-size: 1.1rem; }
        }

        @media (max-width: 520px) {
            .hero h1 { font-size: 1.4rem; }
            .hero .btn-group { flex-direction: column; width: 100%; }
            .hero .btn-primary, .hero .btn-outline { width: 100%; justify-content: center; }
            .container { padding: 0 1rem; }
            .section { padding: 2.5rem 0; }
            .card-body { padding: 1.15rem; }
        }

        /* Animations */
        @keyframes fadeUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
        .animate-fade-up { animation: fadeUp 0.6s ease forwards; }
        .delay-1 { animation-delay: 0.1s; }
        .delay-2 { animation-delay: 0.2s; }
        .delay-3 { animation-delay: 0.3s; }

/* roulang page: article */
:root {
            --primary: #1e3a5f;
            --primary-light: #2a5298;
            --primary-dark: #0f2440;
            --accent: #d4a843;
            --accent-light: #e8c56d;
            --accent-dark: #b8892a;
            --neutral: #f8f6f2;
            --neutral-light: #ffffff;
            --neutral-dark: #e2ddd4;
            --text: #1a1a2e;
            --text-muted: #6b7280;
            --radius: 12px;
            --radius-sm: 8px;
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
            --transition: all 0.3s ease;
        }
        * { margin:0; padding:0; box-sizing:border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background: var(--neutral);
            color: var(--text);
            line-height: 1.7;
        }
        a { text-decoration:none; color:inherit; transition: var(--transition); }
        img { max-width:100%; height:auto; display:block; border-radius: var(--radius-sm); }
        button, input, textarea { font-family:inherit; outline:none; border:none; }
        ul, ol { list-style:none; padding:0; margin:0; }

        /* Layout */
        .app-wrapper { display:flex; min-height:100vh; }
        .sidebar {
            width: 240px;
            flex-shrink: 0;
            background: var(--primary);
            color: #fff;
            padding: 2rem 1.25rem;
            display: flex;
            flex-direction: column;
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 100;
            transition: var(--transition);
            overflow-y: auto;
        }
        .sidebar .logo { font-size:1.35rem; font-weight:700; letter-spacing:0.5px; margin-bottom:2.5rem; display:flex; align-items:center; gap:0.5rem; }
        .sidebar .logo span { color: var(--accent); font-weight:300; }
        .sidebar .logo i { font-size:1.5rem; color:var(--accent); }
        .sidebar nav { flex:1; display:flex; flex-direction:column; gap:0.4rem; }
        .sidebar nav a {
            display:flex; align-items:center; gap:0.75rem;
            padding:0.7rem 1rem; border-radius:var(--radius-sm);
            font-size:0.9rem; font-weight:500; color:rgba(255,255,255,0.75);
            transition: var(--transition);
        }
        .sidebar nav a:hover, .sidebar nav a.active { background:rgba(255,255,255,0.12); color:#fff; }
        .sidebar nav a.active { background:var(--accent); color:var(--primary-dark); font-weight:600; }
        .sidebar nav a i { width:1.25rem; text-align:center; font-size:1rem; }
        .sidebar-footer { margin-top:auto; padding-top:1.5rem; border-top:1px solid rgba(255,255,255,0.08); font-size:0.75rem; color:rgba(255,255,255,0.4); text-align:center; }

        .main-content {
            margin-left: 240px;
            flex:1;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        /* Mobile header */
        .mobile-header {
            display: none;
            background: var(--primary);
            color: #fff;
            padding: 0.75rem 1rem;
            position: sticky;
            top: 0;
            z-index: 99;
            align-items: center;
            justify-content: space-between;
        }
        .mobile-header .logo { font-size:1.2rem; font-weight:700; }
        .mobile-header .logo span { color:var(--accent); }
        .mobile-menu-btn { background:none; color:#fff; font-size:1.4rem; cursor:pointer; padding:0.25rem; }
        .sidebar-overlay { display:none; position:fixed; inset:0; background:rgba(0,0,0,0.4); z-index:98; }

        /* Main container */
        .container { max-width:1200px; margin:0 auto; padding:0 1.5rem; }

        /* Article header */
        .article-header {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
            padding: 3rem 0 2.5rem;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .article-header::before {
            content:'';
            position:absolute; inset:0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity:0.10;
            mix-blend-mode: overlay;
        }
        .article-header .container { position:relative; z-index:2; }
        .article-header .breadcrumb { display:flex; gap:0.5rem; font-size:0.85rem; color:rgba(255,255,255,0.6); margin-bottom:1.25rem; }
        .article-header .breadcrumb a { color:rgba(255,255,255,0.7); }
        .article-header .breadcrumb a:hover { color:var(--accent); }
        .article-header .breadcrumb .sep { color:rgba(255,255,255,0.3); }
        .article-header h1 { font-size:2rem; font-weight:700; line-height:1.35; margin-bottom:1rem; max-width:900px; }
        .article-header .meta { display:flex; flex-wrap:wrap; gap:1.25rem; font-size:0.85rem; color:rgba(255,255,255,0.7); }
        .article-header .meta span { display:flex; align-items:center; gap:0.4rem; }
        .article-header .meta i { font-size:0.9rem; }
        .article-header .category-tag {
            display:inline-block; background:var(--accent); color:var(--primary-dark);
            padding:0.2rem 1rem; border-radius:20px; font-size:0.8rem; font-weight:600;
        }

        /* Article body */
        .article-body { padding:3rem 0 4rem; }
        .article-body .content-area {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 2.5rem 3rem;
            font-size:1rem;
            line-height:1.9;
            color: var(--text);
        }
        .article-body .content-area h2 { font-size:1.5rem; margin:2rem 0 1rem; color:var(--primary); }
        .article-body .content-area h3 { font-size:1.2rem; margin:1.5rem 0 0.75rem; color:var(--primary-light); }
        .article-body .content-area p { margin-bottom:1.25rem; }
        .article-body .content-area ul, .article-body .content-area ol { margin:1rem 0 1.25rem 1.5rem; }
        .article-body .content-area li { margin-bottom:0.5rem; list-style:disc; }
        .article-body .content-area a { color:var(--primary-light); text-decoration:underline; }
        .article-body .content-area a:hover { color:var(--accent-dark); }
        .article-body .content-area blockquote {
            border-left:4px solid var(--accent); background:var(--neutral);
            padding:1rem 1.5rem; margin:1.5rem 0; border-radius:0 var(--radius-sm) var(--radius-sm) 0;
            color:var(--text-muted);
        }
        .article-body .content-area img { margin:1.5rem auto; border-radius:var(--radius); box-shadow:var(--shadow); }
        .article-body .content-area .wp-caption { text-align:center; font-size:0.85rem; color:var(--text-muted); margin-top:-0.75rem; }

        /* Article footer - share & nav */
        .article-footer-bar {
            margin-top:2.5rem; padding-top:1.5rem; border-top:1px solid var(--neutral-dark);
            display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:1rem;
        }
        .article-footer-bar .tags { display:flex; flex-wrap:wrap; gap:0.5rem; }
        .article-footer-bar .tags a {
            background:var(--neutral); padding:0.3rem 1rem; border-radius:20px;
            font-size:0.8rem; color:var(--text-muted); border:1px solid var(--neutral-dark);
        }
        .article-footer-bar .tags a:hover { background:var(--accent); color:#fff; border-color:var(--accent); }
        .article-footer-bar .share { display:flex; align-items:center; gap:0.75rem; }
        .article-footer-bar .share span { font-size:0.85rem; color:var(--text-muted); }
        .article-footer-bar .share a {
            width:36px; height:36px; border-radius:50%; display:flex; align-items:center; justify-content:center;
            background:var(--neutral); color:var(--text-muted); border:1px solid var(--neutral-dark);
            transition: var(--transition);
        }
        .article-footer-bar .share a:hover { background:var(--primary); color:#fff; border-color:var(--primary); }

        /* Related posts */
        .related-section { padding:0 0 3rem; }
        .related-section h2 { font-size:1.5rem; font-weight:700; margin-bottom:1.5rem; color:var(--primary); display:flex; align-items:center; gap:0.75rem; }
        .related-section h2 i { color:var(--accent); }
        .related-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:1.5rem; }
        .related-card {
            background:#fff; border-radius:var(--radius); box-shadow:var(--shadow);
            overflow:hidden; transition: var(--transition);
        }
        .related-card:hover { transform:translateY(-4px); box-shadow:var(--shadow-lg); }
        .related-card .card-img { height:160px; background:var(--neutral-dark); position:relative; overflow:hidden; }
        .related-card .card-img img { width:100%; height:100%; object-fit:cover; }
        .related-card .card-body { padding:1.25rem 1.25rem 1.5rem; }
        .related-card .card-body h3 { font-size:1rem; font-weight:600; line-height:1.4; margin-bottom:0.5rem; display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; }
        .related-card .card-body h3 a { color:var(--text); }
        .related-card .card-body h3 a:hover { color:var(--primary-light); }
        .related-card .card-body .meta { font-size:0.8rem; color:var(--text-muted); display:flex; gap:1rem; }

        /* Not found */
        .not-found { text-align:center; padding:4rem 2rem; }
        .not-found i { font-size:3rem; color:var(--accent); margin-bottom:1rem; }
        .not-found h2 { font-size:1.8rem; margin-bottom:0.75rem; }
        .not-found p { color:var(--text-muted); margin-bottom:1.5rem; }
        .not-found .btn-back { display:inline-block; background:var(--primary); color:#fff; padding:0.7rem 2rem; border-radius:30px; font-weight:500; }
        .not-found .btn-back:hover { background:var(--primary-light); }

        /* Footer */
        .footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.8);
            padding: 3rem 0 1.5rem;
            margin-top: auto;
        }
        .footer .grid-3 { display:grid; grid-template-columns:1.5fr 1fr 1.2fr; gap:2rem; }
        .footer .footer-brand { font-size:1.25rem; font-weight:700; color:#fff; margin-bottom:0.75rem; }
        .footer .footer-brand span { color:var(--accent); }
        .footer .footer-desc { font-size:0.85rem; color:rgba(255,255,255,0.55); line-height:1.7; max-width:300px; }
        .footer h4 { color:#ffffff; font-size:1rem; font-weight:600; margin-bottom:0.75rem; }
        .footer .footer-links a { display:block; font-size:0.85rem; color:rgba(255,255,255,0.6); padding:0.15rem 0; }
        .footer .footer-links a:hover { color:var(--accent); }
        .footer .footer-bottom {
            margin-top:2rem; padding-top:1.25rem; border-top:1px solid rgba(255,255,255,0.08);
            display:flex; flex-wrap:wrap; justify-content:space-between; align-items:center;
            font-size:0.8rem; color:rgba(255,255,255,0.4);
        }
        .footer .footer-bottom a { color:rgba(255,255,255,0.5); }
        .footer .footer-bottom a:hover { color:var(--accent); }

        /* Responsive */
        @media (max-width: 1024px) {
            .related-grid { grid-template-columns:repeat(2,1fr); }
            .article-body .content-area { padding:2rem; }
        }
        @media (max-width: 768px) {
            .sidebar { transform:translateX(-100%); }
            .sidebar.open { transform:translateX(0); }
            .sidebar-overlay.open { display:block; }
            .mobile-header { display:flex; }
            .main-content { margin-left:0; }
            .article-header h1 { font-size:1.5rem; }
            .article-header { padding:2rem 0 1.5rem; }
            .article-body .content-area { padding:1.5rem; }
            .footer .grid-3 { grid-template-columns:1fr; gap:1.5rem; }
            .article-footer-bar { flex-direction:column; align-items:flex-start; }
            .related-grid { grid-template-columns:1fr; }
            .container { padding:0 1rem; }
        }
        @media (max-width: 520px) {
            .article-header h1 { font-size:1.25rem; }
            .article-body .content-area { padding:1rem; font-size:0.95rem; }
            .article-body .content-area h2 { font-size:1.2rem; }
            .article-header .meta { flex-direction:column; gap:0.4rem; }
            .footer .footer-bottom { flex-direction:column; gap:0.5rem; text-align:center; }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f172a;
            --primary-light: #1e293b;
            --primary-dark: #0a0f1a;
            --accent: #3b82f6;
            --accent-hover: #2563eb;
            --accent-light: #dbeafe;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --bg-sidebar: #0f172a;
            --bg-mobile-header: #0f172a;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --text-light: #f8fafc;
            --text-muted: #94a3b8;
            --border-color: #e2e8f0;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10);
            --shadow-hover: 0 20px 50px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 240px;
            --header-height: 64px;
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 1rem;
            display: flex;
            min-height: 100vh;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
        }

        /* ===== 容器 ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
            width: 100%;
        }

        /* ===== 左侧导航 (桌面) ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-sidebar);
            color: var(--text-light);
            display: flex;
            flex-direction: column;
            padding: 2rem 0 1.5rem 0;
            z-index: 1000;
            transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            border-right: 1px solid rgba(255, 255, 255, 0.06);
            overflow-y: auto;
        }
        .sidebar-brand {
            padding: 0 1.5rem 2rem 1.5rem;
            font-size: 1.35rem;
            font-weight: 700;
            letter-spacing: 0.01em;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .sidebar-brand span {
            color: var(--accent);
            font-weight: 400;
        }
        .sidebar-brand .brand-icon {
            width: 32px;
            height: 32px;
            background: var(--accent);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: #fff;
            flex-shrink: 0;
        }
        .sidebar-nav {
            padding: 1.5rem 1rem 2rem 1rem;
            display: flex;
            flex-direction: column;
            gap: 0.25rem;
            flex: 1;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.7rem 1rem;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            position: relative;
        }
        .sidebar-nav a i {
            width: 1.25rem;
            text-align: center;
            font-size: 1rem;
            flex-shrink: 0;
        }
        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.08);
            color: #ffffff;
            transform: translateX(4px);
        }
        .sidebar-nav a.active {
            background: rgba(59, 130, 246, 0.18);
            color: #ffffff;
            font-weight: 600;
            box-shadow: inset 3px 0 0 var(--accent);
        }
        .sidebar-nav a.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--accent);
            border-radius: 0 4px 4px 0;
        }
        .sidebar-nav .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: rgba(255, 255, 255, 0.3);
            padding: 1rem 1rem 0.35rem 1rem;
            font-weight: 600;
        }
        .sidebar-footer {
            padding: 1rem 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.75rem;
            color: rgba(255, 255, 255, 0.35);
            text-align: center;
        }

        /* ===== 移动端顶部导航 ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: var(--bg-mobile-header);
            color: var(--text-light);
            padding: 0 1.25rem;
            align-items: center;
            justify-content: space-between;
            z-index: 1100;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .mobile-header .logo {
            font-size: 1.2rem;
            font-weight: 700;
            color: #ffffff;
            letter-spacing: 0.01em;
        }
        .mobile-header .logo span {
            color: var(--accent);
            font-weight: 400;
        }
        .mobile-menu-btn {
            color: #ffffff;
            font-size: 1.3rem;
            padding: 0.25rem;
            border-radius: 6px;
            transition: var(--transition);
        }
        .mobile-menu-btn:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        /* ===== 移动端侧边栏抽屉 ===== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1050;
            backdrop-filter: blur(4px);
            -webkit-backdrop-filter: blur(4px);
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .sidebar-overlay.open {
            opacity: 1;
        }
        .sidebar.open {
            transform: translateX(0);
        }

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

        /* ===== Hero / 页面Banner ===== */
        .page-hero {
            position: relative;
            padding: 6rem 0 5rem 0;
            background: var(--primary);
            color: var(--text-light);
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-hero .hero-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.25;
            z-index: 0;
        }
        .page-hero .hero-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 50%, rgba(15, 23, 42, 0.5) 100%);
        }
        .page-hero .container {
            position: relative;
            z-index: 1;
        }
        .page-hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: rgba(59, 130, 246, 0.2);
            border: 1px solid rgba(59, 130, 246, 0.25);
            padding: 0.3rem 1rem;
            border-radius: 50px;
            font-size: 0.8rem;
            color: var(--accent);
            font-weight: 500;
            margin-bottom: 1.25rem;
            backdrop-filter: blur(4px);
        }
        .page-hero h1 {
            font-size: 2.75rem;
            font-weight: 800;
            color: #ffffff;
            line-height: 1.2;
            max-width: 720px;
            margin-bottom: 1rem;
        }
        .page-hero h1 span {
            color: var(--accent);
        }
        .page-hero p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 600px;
            line-height: 1.7;
            margin-bottom: 0.5rem;
        }
        .page-hero .hero-stats {
            display: flex;
            gap: 2.5rem;
            margin-top: 2rem;
            flex-wrap: wrap;
        }
        .page-hero .hero-stat {
            text-align: center;
        }
        .page-hero .hero-stat .num {
            font-size: 2rem;
            font-weight: 800;
            color: #ffffff;
            line-height: 1.2;
        }
        .page-hero .hero-stat .label {
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.55);
            font-weight: 400;
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: 4.5rem 0;
        }
        .section-alt {
            background: #ffffff;
        }
        .section-gray {
            background: #f1f5f9;
        }
        .section-dark {
            background: var(--primary);
            color: var(--text-light);
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 0.75rem;
            color: var(--text-primary);
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin-bottom: 2.5rem;
            line-height: 1.7;
        }
        .section-dark .section-title {
            color: #ffffff;
        }
        .section-dark .section-subtitle {
            color: rgba(255, 255, 255, 0.65);
        }
        .section .section-head {
            text-align: center;
            margin-bottom: 3rem;
        }
        .section .section-head .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            padding: 1.75rem;
            transition: var(--transition);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: rgba(59, 130, 246, 0.15);
        }
        .card .card-icon {
            width: 48px;
            height: 48px;
            background: var(--accent-light);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--accent);
            margin-bottom: 1rem;
            transition: var(--transition);
        }
        .card:hover .card-icon {
            background: var(--accent);
            color: #ffffff;
        }
        .card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        .card p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .card .card-tag {
            display: inline-block;
            font-size: 0.7rem;
            font-weight: 600;
            padding: 0.2rem 0.7rem;
            border-radius: 50px;
            background: var(--accent-light);
            color: var(--accent);
            margin-top: 0.75rem;
            letter-spacing: 0.02em;
            text-transform: uppercase;
        }

        /* ===== 图片卡片 (内容卡片) ===== */
        .content-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .content-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .content-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
            display: block;
        }
        .content-card .card-body {
            padding: 1.5rem;
        }
        .content-card .card-body h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 0.4rem;
            line-height: 1.4;
        }
        .content-card .card-body p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 0.75rem;
        }
        .content-card .card-meta {
            display: flex;
            align-items: center;
            gap: 1rem;
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .content-card .card-meta i {
            margin-right: 0.3rem;
        }

        /* ===== 步骤流程 ===== */
        .step-list {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            counter-reset: step;
        }
        .step-item {
            flex: 1 1 180px;
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 2rem 1.5rem;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .step-item .step-number {
            width: 48px;
            height: 48px;
            background: var(--accent);
            color: #ffffff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 700;
            margin: 0 auto 1rem auto;
            transition: var(--transition);
        }
        .step-item:hover .step-number {
            background: var(--primary);
            transform: scale(1.05);
        }
        .step-item h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 0.4rem;
        }
        .step-item p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(59, 130, 246, 0.2);
        }
        .faq-question {
            padding: 1.2rem 1.5rem;
            font-weight: 600;
            font-size: 0.98rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            transition: var(--transition);
            color: var(--text-primary);
            background: transparent;
            width: 100%;
            text-align: left;
        }
        .faq-question i {
            color: var(--accent);
            transition: transform 0.3s ease;
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 1.5rem;
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.7;
            background: rgba(248, 250, 252, 0.5);
        }
        .faq-answer.open {
            max-height: 240px;
            padding: 0 1.5rem 1.2rem 1.5rem;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            padding: 4rem 0;
            text-align: center;
            color: #ffffff;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 0.75rem;
        }
        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 560px;
            margin: 0 auto 2rem auto;
            line-height: 1.7;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1.75rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: 2px solid transparent;
            cursor: pointer;
            text-align: center;
            justify-content: center;
        }
        .btn-primary {
            background: var(--accent);
            color: #ffffff;
            border-color: var(--accent);
        }
        .btn-primary:hover {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(59, 130, 246, 0.35);
        }
        .btn-outline-light {
            background: transparent;
            color: #ffffff;
            border-color: rgba(255, 255, 255, 0.35);
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.6);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 0.45rem 1.2rem;
            font-size: 0.82rem;
        }

        /* ===== 标签/徽章 ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            padding: 0.25rem 0.8rem;
            border-radius: 50px;
            font-size: 0.72rem;
            font-weight: 600;
            background: var(--accent-light);
            color: var(--accent);
            letter-spacing: 0.02em;
        }
        .badge-green {
            background: #dcfce7;
            color: #16a34a;
        }
        .badge-orange {
            background: #ffedd5;
            color: #ea580c;
        }

        /* ===== 网格 ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 1.5rem;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr;
            gap: 1.5rem;
        }

        /* ===== 分隔线 ===== */
        .divider {
            width: 60px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin: 0.5rem 0 1.5rem 0;
        }
        .divider.center {
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 3.5rem 0 0 0;
            font-size: 0.9rem;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        .footer .footer-brand {
            font-size: 1.25rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 0.75rem;
        }
        .footer .footer-brand span {
            color: var(--accent);
            font-weight: 400;
        }
        .footer .footer-desc {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer .footer-links {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .footer .footer-links a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.88rem;
            transition: var(--transition);
        }
        .footer .footer-links a:hover {
            color: #ffffff;
            padding-left: 4px;
        }
        .footer .footer-bottom {
            margin-top: 2.5rem;
            padding: 1.5rem 0;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.75rem;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer .footer-bottom a:hover {
            color: var(--accent);
        }
        .footer h4 {
            color: #ffffff;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .page-hero h1 {
                font-size: 2.25rem;
            }
        }

        @media (max-width: 768px) {
            /* 切换为移动端布局 */
            .sidebar {
                transform: translateX(-100%);
                width: 280px;
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .sidebar-overlay {
                display: block;
                pointer-events: none;
            }
            .sidebar-overlay.open {
                pointer-events: auto;
            }
            .mobile-header {
                display: flex;
            }
            .main-wrap {
                margin-left: 0;
                width: 100%;
                padding-top: var(--header-height);
            }
            .main-content {
                padding-top: 0;
            }
            .page-hero {
                padding: 4rem 0 3.5rem 0;
                min-height: 260px;
            }
            .page-hero h1 {
                font-size: 1.8rem;
            }
            .page-hero p {
                font-size: 0.95rem;
            }
            .page-hero .hero-stats {
                gap: 1.5rem;
            }
            .page-hero .hero-stat .num {
                font-size: 1.5rem;
            }
            .section {
                padding: 3rem 0;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .step-list {
                flex-direction: column;
            }
            .step-item {
                flex: 1 1 auto;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .container {
                padding: 0 1.25rem;
            }
        }

        @media (max-width: 520px) {
            .page-hero h1 {
                font-size: 1.5rem;
            }
            .page-hero .hero-stats {
                flex-direction: column;
                gap: 0.75rem;
            }
            .page-hero .hero-stat {
                display: flex;
                align-items: center;
                gap: 0.75rem;
                text-align: left;
            }
            .btn {
                padding: 0.6rem 1.4rem;
                font-size: 0.85rem;
            }
            .card {
                padding: 1.25rem;
            }
            .content-card .card-img {
                height: 160px;
            }
            .section-title {
                font-size: 1.35rem;
            }
        }

        /* ===== 辅助 ===== */
        .text-accent {
            color: var(--accent);
        }
        .gap-1 {
            gap: 0.5rem;
        }
        .gap-2 {
            gap: 1rem;
        }
        .gap-3 {
            gap: 1.5rem;
        }
        .mt-1 {
            margin-top: 0.5rem;
        }
        .mt-2 {
            margin-top: 1rem;
        }
        .mt-3 {
            margin-top: 1.5rem;
        }
        .mb-1 {
            margin-bottom: 0.5rem;
        }
        .mb-2 {
            margin-bottom: 1rem;
        }
        .mb-3 {
            margin-bottom: 1.5rem;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .text-center {
            text-align: center;
        }
        .rounded-full {
            border-radius: 50px;
        }

/* roulang page: category2 */
/* ===== 设计变量 & 基础样式 ===== */
        :root {
            --primary: #1e3a6f;
            --primary-light: #2a5298;
            --primary-dark: #0f2440;
            --accent: #f59e0b;
            --accent-hover: #d97706;
            --bg-body: #f1f5f9;
            --bg-card: #ffffff;
            --text-main: #1e293b;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --border-light: #e2e8f0;
            --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 12px 40px rgba(0,0,0,0.12);
            --radius-md: 12px;
            --radius-lg: 20px;
            --nav-width: 260px;
            --transition: 0.25s ease;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background: var(--bg-body);
            color: var(--text-main);
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
        }
        /* ===== 左侧导航 (桌面) ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--bg-card);
            border-right: 1px solid var(--border-light);
            box-shadow: 2px 0 20px rgba(0,0,0,0.04);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            transition: transform var(--transition);
        }
        .sidebar-brand {
            padding: 1.75rem 1.5rem 1.25rem;
            border-bottom: 1px solid var(--border-light);
        }
        .sidebar-brand .logo {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }
        .sidebar-brand .logo span {
            color: var(--accent);
            font-weight: 600;
        }
        .sidebar-brand .logo-sub {
            font-size: 0.7rem;
            color: var(--text-muted);
            letter-spacing: 0.3px;
            margin-top: 0.1rem;
        }
        .sidebar-nav {
            flex: 1;
            padding: 1.25rem 1rem;
            overflow-y: auto;
        }
        .sidebar-nav .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.8px;
            color: var(--text-light);
            font-weight: 600;
            padding: 0 0.75rem;
            margin-bottom: 0.6rem;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.7rem 0.85rem;
            border-radius: 10px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-muted);
            transition: background var(--transition), color var(--transition), transform 0.2s;
            margin-bottom: 0.2rem;
        }
        .sidebar-nav a i {
            width: 1.25rem;
            text-align: center;
            font-size: 1rem;
        }
        .sidebar-nav a:hover {
            background: #eef2f7;
            color: var(--primary);
            transform: translateX(4px);
        }
        .sidebar-nav a.active {
            background: var(--primary);
            color: #ffffff;
            box-shadow: 0 4px 12px rgba(30, 58, 111, 0.25);
        }
        .sidebar-nav a.active i {
            color: #ffffff;
        }
        .sidebar-footer {
            padding: 1.25rem 1.5rem;
            border-top: 1px solid var(--border-light);
            font-size: 0.75rem;
            color: var(--text-light);
            text-align: center;
        }
        /* ===== 右侧主内容区 ===== */
        .main-content {
            margin-left: var(--nav-width);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        /* ===== 移动端顶部导航 ===== */
        .mobile-header {
            display: none;
            position: sticky;
            top: 0;
            z-index: 1100;
            background: var(--bg-card);
            border-bottom: 1px solid var(--border-light);
            padding: 0.75rem 1rem;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
        }
        .mobile-header .logo {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary);
        }
        .mobile-header .logo span {
            color: var(--accent);
        }
        .mobile-menu-btn {
            background: none;
            border: none;
            font-size: 1.3rem;
            color: var(--primary);
            cursor: pointer;
            padding: 0.25rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .mobile-menu-btn:hover {
            background: #eef2f7;
        }
        /* ===== 侧边栏遮罩 (移动端) ===== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.4);
            z-index: 999;
            backdrop-filter: blur(2px);
        }
        .sidebar-overlay.open {
            display: block;
        }
        /* ===== 通用组件 ===== */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        /* 板块间距 */
        .section {
            padding: 4rem 0;
        }
        .section-title {
            font-size: 1.9rem;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: -0.02em;
            margin-bottom: 0.5rem;
            line-height: 1.25;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 620px;
            margin-bottom: 2.5rem;
            line-height: 1.6;
        }
        .section-subtitle.center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }
        .section-title.center {
            text-align: center;
        }
        /* 卡片 */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition), transform 0.3s;
            overflow: hidden;
            border: 1px solid rgba(0,0,0,0.03);
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .card-body {
            padding: 1.5rem;
        }
        .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            display: block;
        }
        /* 按钮 */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 1.6rem;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.9rem;
            border: none;
            cursor: pointer;
            transition: background var(--transition), transform 0.2s, box-shadow var(--transition);
            text-decoration: none;
        }
        .btn-primary {
            background: var(--primary);
            color: #ffffff;
            box-shadow: 0 4px 14px rgba(30, 58, 111, 0.25);
        }
        .btn-primary:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(30, 58, 111, 0.3);
        }
        .btn-accent {
            background: var(--accent);
            color: #1e293b;
            box-shadow: 0 4px 14px rgba(245, 158, 11, 0.3);
        }
        .btn-accent:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.35);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #ffffff;
            transform: translateY(-2px);
        }
        /* 标签徽章 */
        .badge {
            display: inline-block;
            padding: 0.25rem 0.85rem;
            border-radius: 40px;
            font-size: 0.75rem;
            font-weight: 600;
            background: #eef2f7;
            color: var(--primary);
            letter-spacing: 0.2px;
        }
        .badge-accent {
            background: #fef3c7;
            color: #b45309;
        }
        /* 分隔线 */
        .divider {
            width: 60px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin: 1rem 0 1.5rem;
        }
        .divider.center {
            margin-left: auto;
            margin-right: auto;
        }
        /* 网格 */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.8rem;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.8rem;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }
        /* ===== Banner / Hero ===== */
        .page-banner {
            position: relative;
            padding: 5rem 0 4.5rem;
            background: var(--primary-dark);
            color: #ffffff;
            overflow: hidden;
        }
        .page-banner .bg-img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.18;
            pointer-events: none;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
        }
        .page-banner h1 {
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.2;
            margin-bottom: 1rem;
        }
        .page-banner p {
            font-size: 1.1rem;
            opacity: 0.85;
            max-width: 600px;
            line-height: 1.6;
        }
        .page-banner .breadcrumb {
            display: flex;
            gap: 0.5rem;
            font-size: 0.85rem;
            opacity: 0.7;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
        }
        .page-banner .breadcrumb a {
            opacity: 0.8;
        }
        .page-banner .breadcrumb a:hover {
            opacity: 1;
            text-decoration: underline;
        }
        /* ===== 步骤区 ===== */
        .step-item {
            display: flex;
            gap: 1.2rem;
            padding: 1.5rem;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(0,0,0,0.03);
            transition: box-shadow var(--transition), transform 0.3s;
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .step-number {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
        }
        .step-content h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 0.3rem;
            color: var(--primary-dark);
        }
        .step-content p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
        }
        /* ===== FAQ ===== */
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: box-shadow var(--transition);
            margin-bottom: 0.8rem;
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 1.1rem 1.5rem;
            font-size: 0.98rem;
            font-weight: 600;
            color: var(--text-main);
            text-align: left;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            transition: background 0.2s;
        }
        .faq-question:hover {
            background: #fafbfc;
        }
        .faq-question i {
            transition: transform 0.3s;
            color: var(--text-light);
            font-size: 0.85rem;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 1.5rem;
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.7;
        }
        .faq-answer.open {
            max-height: 300px;
            padding: 0 1.5rem 1.2rem;
        }
        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            color: #ffffff;
            text-align: center;
            padding: 4.5rem 0;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 0.75rem;
        }
        .cta-section p {
            opacity: 0.85;
            max-width: 560px;
            margin: 0 auto 2rem;
            font-size: 1.05rem;
        }
        .cta-section .btn {
            font-size: 1rem;
            padding: 0.9rem 2.4rem;
        }
        /* ===== 页脚 ===== */
        .footer {
            background: #0f2440;
            color: #cbd5e1;
            padding: 3.5rem 0 0;
            font-size: 0.9rem;
        }
        .footer .footer-brand {
            font-size: 1.25rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 0.5rem;
        }
        .footer .footer-brand span {
            color: var(--accent);
        }
        .footer-desc {
            color: #94a3b8;
            line-height: 1.7;
            font-size: 0.85rem;
            max-width: 320px;
        }
        .footer-links a {
            color: #94a3b8;
            transition: color 0.2s;
            font-size: 0.88rem;
        }
        .footer-links a:hover {
            color: #ffffff;
        }
        .footer-bottom {
            margin-top: 2.5rem;
            padding: 1.2rem 0;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.5rem;
            font-size: 0.8rem;
            color: #64748b;
        }
        .footer-bottom a {
            color: #94a3b8;
        }
        .footer-bottom a:hover {
            color: #ffffff;
        }
        /* ===== 问题分类卡片 (带图) ===== */
        .problem-card .card-img {
            height: 150px;
        }
        .problem-card .card-body h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--primary-dark);
            margin-bottom: 0.3rem;
        }
        .problem-card .card-body p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.6;
        }
        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .section {
                padding: 3rem 0;
            }
            .page-banner h1 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
                width: 280px;
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .main-content {
                margin-left: 0;
            }
            .mobile-header {
                display: flex;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: 1.2rem;
            }
            .section {
                padding: 2.5rem 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .page-banner {
                padding: 3rem 0 2.8rem;
            }
            .page-banner h1 {
                font-size: 1.7rem;
            }
            .page-banner p {
                font-size: 0.95rem;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .container {
                padding: 0 1rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .step-item {
                flex-direction: column;
                align-items: flex-start;
            }
        }
        @media (max-width: 520px) {
            .page-banner h1 {
                font-size: 1.4rem;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .btn {
                padding: 0.6rem 1.2rem;
                font-size: 0.82rem;
            }
            .card-body {
                padding: 1rem;
            }
            .faq-question {
                padding: 0.9rem 1rem;
                font-size: 0.9rem;
            }
            .faq-answer.open {
                padding: 0 1rem 0.9rem;
            }
        }
        /* ===== 辅助 ===== */
        .text-accent {
            color: var(--accent);
        }
        .text-muted {
            color: var(--text-muted);
        }
        .text-primary {
            color: var(--primary);
        }
        .bg-soft {
            background: #f8fafc;
        }
        .gap-1 {
            gap: 1rem;
        }
        .gap-2 {
            gap: 2rem;
        }
        .mt-1 {
            margin-top: 1rem;
        }
        .mt-2 {
            margin-top: 2rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .mb-2 {
            margin-bottom: 2rem;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        /* 过渡动画 */
        .fade-up {
            opacity: 0;
            transform: translateY(28px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }
        /* 表单输入 */
        .input-field {
            width: 100%;
            padding: 0.75rem 1.2rem;
            border: 1px solid var(--border-light);
            border-radius: 40px;
            font-size: 0.9rem;
            background: var(--bg-card);
            transition: border-color 0.2s, box-shadow 0.2s;
            outline: none;
        }
        .input-field:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(30, 58, 111, 0.12);
        }
        /* 平滑滚动偏移 */
        .scroll-offset {
            scroll-margin-top: 80px;
        }