/* roulang page: index */
:root {
            --primary: #1a56db;
            --primary-dark: #143fa8;
            --primary-light: #e8eeff;
            --secondary: #f59e0b;
            --secondary-light: #fef3c7;
            --accent: #10b981;
            --bg: #f8fafc;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 16px;
            --radius-sm: 8px;
            --radius-lg: 24px;
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-lg: 0 12px 48px rgba(0,0,0,0.10);
            --shadow-hover: 0 16px 48px rgba(26,86,219,0.12);
            --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
            --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --header-h: 80px;
        }

        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font);
            color: var(--text);
            background: var(--bg);
            line-height: 1.6;
            font-size: 16px;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        button, input, textarea { font-family: inherit; font-size: 1rem; outline: none; border: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        h1 { font-size: 2.8rem; letter-spacing: -0.02em; }
        h2 { font-size: 2rem; letter-spacing: -0.01em; }
        h3 { font-size: 1.4rem; }
        p { margin-bottom: 1rem; color: var(--text-light); }
        .container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

        /* === Header & Nav === */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            height: var(--header-h);
            display: flex;
            align-items: center;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            gap: 20px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--primary);
            white-space: nowrap;
            flex-shrink: 0;
        }
        .logo i { font-size: 1.6rem; color: var(--secondary); }
        .logo span { color: var(--text); }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            color: var(--text-light);
            font-size: 0.95rem;
            transition: 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; background: var(--primary); border-radius: 4px; }
        .search-wrap {
            flex: 1;
            max-width: 400px;
            position: relative;
            margin: 0 12px;
        }
        .search-wrap input {
            width: 100%;
            padding: 10px 20px 10px 44px;
            border-radius: 40px;
            background: var(--border-light);
            border: 2px solid transparent;
            transition: var(--transition);
            font-size: 0.95rem;
            color: var(--text);
        }
        .search-wrap input:focus { border-color: var(--primary); background: #fff; box-shadow: 0 0 0 4px rgba(26,86,219,0.08); }
        .search-wrap i {
            position: absolute;
            left: 16px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-light);
            font-size: 1rem;
            pointer-events: none;
        }
        .nav-cta {
            background: var(--primary);
            color: #fff !important;
            padding: 10px 24px !important;
            border-radius: 40px !important;
            font-weight: 600 !important;
            font-size: 0.9rem !important;
        }
        .nav-cta:hover { background: var(--primary-dark) !important; transform: translateY(-1px); box-shadow: 0 8px 20px rgba(26,86,219,0.25); }
        .mobile-toggle { display: none; background: none; font-size: 1.5rem; color: var(--text); cursor: pointer; padding: 4px; }

        /* === Hero === */
        .hero {
            position: relative;
            min-height: 520px;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, #0f1f4a 0%, #1a3a7a 40%, #1a56db 100%);
            overflow: hidden;
            padding: 80px 0 60px;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .hero-bg-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(245,158,11,0.15) 0%, transparent 60%);
        }
        .hero .container { position: relative; z-index: 2; width: 100%; }
        .hero-content { max-width: 720px; }
        .hero h1 { color: #fff; font-size: 3.2rem; line-height: 1.2; margin-bottom: 16px; }
        .hero h1 span { color: var(--secondary); }
        .hero p { color: rgba(255,255,255,0.75); font-size: 1.15rem; max-width: 580px; margin-bottom: 32px; }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
        .hero-btn-primary {
            background: var(--secondary);
            color: #1e293b !important;
            padding: 14px 36px;
            border-radius: 40px;
            font-weight: 700;
            font-size: 1.05rem;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
        }
        .hero-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(245,158,11,0.35); background: #d97706; }
        .hero-btn-secondary {
            background: rgba(255,255,255,0.10);
            color: #fff !important;
            padding: 14px 28px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 1rem;
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255,255,255,0.15);
            display: inline-flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
        }
        .hero-btn-secondary:hover { background: rgba(255,255,255,0.18); }

        /* === Section === */
        .section { padding: 80px 0; }
        .section-alt { background: #fff; }
        .section-dark { background: var(--bg-dark); }
        .section-header { text-align: center; margin-bottom: 48px; }
        .section-header h2 { margin-bottom: 12px; }
        .section-header p { max-width: 600px; margin: 0 auto; font-size: 1.1rem; }
        .section-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 6px 18px;
            border-radius: 40px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 16px;
        }

        /* === Grid / Cards === */
        .grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 28px; }
        .grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 28px; }
        .grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }

        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 32px 28px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid var(--border-light);
        }
        .card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--primary-light); }
        .card-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: #fff;
            margin-bottom: 20px;
            background: var(--primary);
        }
        .card-icon.c2 { background: var(--secondary); }
        .card-icon.c3 { background: var(--accent); }
        .card h3 { margin-bottom: 10px; font-size: 1.2rem; }
        .card p { font-size: 0.95rem; margin-bottom: 0; }

        /* Category Cards */
        .cat-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
        }
        .cat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
        .cat-card-img {
            height: 200px;
            background: var(--primary-light);
            position: relative;
            overflow: hidden;
        }
        .cat-card-img img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
        .cat-card:hover .cat-card-img img { transform: scale(1.05); }
        .cat-card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
        .cat-card-body h3 { font-size: 1.15rem; margin-bottom: 8px; }
        .cat-card-body p { font-size: 0.9rem; flex: 1; margin-bottom: 16px; }
        .cat-card-body .badge {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.75rem;
            padding: 4px 12px;
            border-radius: 40px;
            font-weight: 600;
            align-self: flex-start;
        }

        /* === Content List (CMS) === */
        .content-list { display: flex; flex-direction: column; gap: 16px; }
        .content-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            background: var(--bg-card);
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .content-item:hover { border-color: var(--primary-light); box-shadow: var(--shadow); }
        .content-item .thumb {
            width: 100px;
            height: 72px;
            border-radius: var(--radius-sm);
            background: var(--border-light);
            flex-shrink: 0;
            overflow: hidden;
        }
        .content-item .thumb img { width: 100%; height: 100%; object-fit: cover; }
        .content-item .info { flex: 1; min-width: 0; }
        .content-item .info h4 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
        .content-item .info h4 a { color: var(--text); }
        .content-item .info h4 a:hover { color: var(--primary); }
        .content-item .info .meta { font-size: 0.8rem; color: var(--text-light); display: flex; gap: 12px; flex-wrap: wrap; }
        .content-item .info .meta span { display: inline-flex; align-items: center; gap: 4px; }
        .content-item .info .desc { font-size: 0.9rem; color: var(--text-light); margin-top: 4px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .content-empty { text-align: center; padding: 48px 20px; color: var(--text-light); font-size: 1.1rem; background: var(--bg-card); border-radius: var(--radius); border: 1px dashed var(--border); }

        /* === Stats === */
        .stats-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
        .stat-item { text-align: center; padding: 32px 16px; background: rgba(255,255,255,0.04); border-radius: var(--radius); border: 1px solid rgba(255,255,255,0.06); }
        .stat-item .num { font-size: 2.6rem; font-weight: 800; color: #fff; line-height: 1.2; }
        .stat-item .num span { color: var(--secondary); }
        .stat-item .label { font-size: 0.95rem; color: rgba(255,255,255,0.6); margin-top: 6px; }

        /* === FAQ === */
        .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            border: 1px solid var(--border-light);
            transition: var(--transition);
            cursor: pointer;
        }
        .faq-item:hover { border-color: var(--primary-light); box-shadow: var(--shadow); }
        .faq-item .q { font-weight: 600; display: flex; align-items: center; gap: 12px; font-size: 1rem; color: var(--text); }
        .faq-item .q i { color: var(--primary); font-size: 1.1rem; }
        .faq-item .a { margin-top: 12px; font-size: 0.92rem; color: var(--text-light); padding-left: 28px; display: none; }
        .faq-item.open .a { display: block; }

        /* === CTA === */
        .cta-block {
            background: linear-gradient(135deg, var(--primary) 0%, #0f2f6e 100%);
            border-radius: var(--radius-lg);
            padding: 64px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-block h2 { color: #fff; font-size: 2rem; margin-bottom: 12px; position: relative; }
        .cta-block p { color: rgba(255,255,255,0.7); max-width: 560px; margin: 0 auto 28px; position: relative; }
        .cta-block .btn-group { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; position: relative; }
        .cta-btn { background: var(--secondary); color: #1e293b; padding: 14px 36px; border-radius: 40px; font-weight: 700; display: inline-flex; align-items: center; gap: 10px; transition: var(--transition); }
        .cta-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(245,158,11,0.3); background: #d97706; }
        .cta-btn-outline { background: rgba(255,255,255,0.10); color: #fff; padding: 14px 28px; border-radius: 40px; font-weight: 600; border: 1px solid rgba(255,255,255,0.2); display: inline-flex; align-items: center; gap: 10px; transition: var(--transition); }
        .cta-btn-outline:hover { background: rgba(255,255,255,0.18); color: #fff; }

        /* === Footer === */
        .site-footer { background: var(--bg-dark); color: var(--text-white); padding: 48px 0 32px; }
        .footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
        .footer-brand .logo { color: #fff; margin-bottom: 16px; }
        .footer-brand .logo span { color: var(--secondary); }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.5); max-width: 300px; }
        .footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul a { color: rgba(255,255,255,0.5); font-size: 0.9rem; transition: var(--transition); }
        .footer-col ul a:hover { color: var(--secondary); }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); padding-top: 24px; margin-top: 40px; text-align: center; font-size: 0.85rem; color: rgba(255,255,255,0.35); }

        /* === Responsive === */
        @media (max-width: 1024px) {
            h1 { font-size: 2.2rem; }
            .hero h1 { font-size: 2.4rem; }
            .grid-4 { grid-template-columns: repeat(2,1fr); }
            .footer-inner { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .header-inner { flex-wrap: wrap; gap: 12px; }
            .nav-list { display: none; }
            .mobile-toggle { display: block; }
            .nav-list.open { display: flex; flex-direction: column; position: absolute; top: var(--header-h); left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(12px); padding: 16px 24px; border-bottom: 1px solid var(--border); gap: 4px; }
            .nav-list.open a { padding: 12px 16px; width: 100%; }
            .search-wrap { order: 3; width: 100%; max-width: 100%; margin: 4px 0 0; }
            .search-wrap input { padding: 10px 16px 10px 40px; }
            .hero { min-height: 400px; padding: 60px 0 40px; }
            .hero h1 { font-size: 1.9rem; }
            .hero p { font-size: 1rem; }
            .grid-3 { grid-template-columns: 1fr; }
            .grid-2 { grid-template-columns: 1fr; }
            .grid-4 { grid-template-columns: repeat(2,1fr); gap: 16px; }
            .section { padding: 48px 0; }
            .faq-grid { grid-template-columns: 1fr; }
            .cta-block { padding: 40px 24px; }
            .cta-block h2 { font-size: 1.5rem; }
            .stats-grid { grid-template-columns: repeat(2,1fr); gap: 16px; }
            .stat-item .num { font-size: 2rem; }
            .footer-inner { grid-template-columns: 1fr; gap: 28px; }
            .content-item { flex-direction: column; }
            .content-item .thumb { width: 100%; height: 140px; }
            .hero-actions { flex-direction: column; align-items: stretch; }
            .hero-btn-primary, .hero-btn-secondary { justify-content: center; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            h1 { font-size: 1.7rem; }
            .hero h1 { font-size: 1.5rem; }
            .grid-4 { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: 1fr; }
            .card { padding: 24px 20px; }
        }

        /* === Utility === */
        .text-center { text-align: center; }
        .mt-12 { margin-top: 12px; }
        .mt-24 { margin-top: 24px; }
        .mb-24 { margin-bottom: 24px; }
        .gap-8 { gap: 8px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .badge-primary { display: inline-block; background: var(--primary-light); color: var(--primary); padding: 4px 14px; border-radius: 40px; font-size: 0.8rem; font-weight: 600; }
        .badge-secondary { display: inline-block; background: var(--secondary-light); color: #b45309; padding: 4px 14px; border-radius: 40px; font-size: 0.8rem; font-weight: 600; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --secondary: #0ea5e9;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --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: #1f2937;
            --text-light: #6b7280;
            --border: #e5e7eb;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.10);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.14);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --container: 1200px;
            --nav-height: 72px;
        }

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

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

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--body-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: var(--transition);
        }
        a:hover {
            color: var(--primary);
        }

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

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

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

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(229, 231, 235, 0.6);
            height: var(--nav-height);
            transition: var(--transition);
        }
        .site-header.scrolled {
            box-shadow: 0 2px 24px rgba(0, 0, 0, 0.06);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--nav-height);
            gap: 16px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--dark);
            flex-shrink: 0;
        }
        .logo i {
            color: var(--primary);
            font-size: 26px;
        }
        .logo span {
            color: var(--primary);
            font-weight: 600;
        }

        /* 搜索框导航风格 */
        .nav-search-wrap {
            flex: 1;
            max-width: 480px;
            margin: 0 16px;
            position: relative;
        }
        .nav-search-wrap .search-input {
            width: 100%;
            padding: 10px 20px 10px 44px;
            border: 1.5px solid var(--border);
            border-radius: 50px;
            background: var(--gray-50);
            font-size: 14px;
            color: var(--text);
            transition: var(--transition);
            outline: none;
        }
        .nav-search-wrap .search-input:focus {
            border-color: var(--primary);
            background: var(--white);
            box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.10);
        }
        .nav-search-wrap .search-icon {
            position: absolute;
            left: 16px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray-400);
            font-size: 15px;
            pointer-events: none;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-shrink: 0;
        }
        .nav-list a {
            padding: 8px 16px;
            border-radius: 50px;
            font-size: 14px;
            font-weight: 500;
            color: var(--gray-600);
            transition: var(--transition);
            position: relative;
            white-space: nowrap;
        }
        .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: 4px;
            background: var(--primary);
        }
        .nav-list a.nav-cta {
            background: var(--primary);
            color: var(--white);
            padding: 8px 22px;
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
        }
        .nav-list a.nav-cta:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
            transform: translateY(-1px);
            color: var(--white);
        }
        .nav-list a.nav-cta i {
            margin-right: 6px;
        }

        /* 移动端汉堡 */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            background: none;
            border: none;
        }
        .hamburger span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--dark);
            border-radius: 4px;
            transition: var(--transition);
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* 移动端菜单 */
        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            background: var(--white);
            border-bottom: 1px solid var(--border);
            padding: 16px 24px 24px;
            box-shadow: var(--shadow);
            z-index: 999;
            max-height: calc(100vh - var(--nav-height));
            overflow-y: auto;
        }
        .mobile-menu.open {
            display: block;
            animation: slideDown 0.3s ease;
        }
        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-12px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .mobile-menu .mobile-nav-list {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .mobile-menu .mobile-nav-list a {
            display: block;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--gray-700);
        }
        .mobile-menu .mobile-nav-list a:hover {
            background: var(--gray-50);
            color: var(--primary);
        }
        .mobile-menu .mobile-nav-list a.active {
            color: var(--primary);
            background: var(--primary-bg);
        }
        .mobile-menu .mobile-nav-list a.nav-cta {
            background: var(--primary);
            color: var(--white);
            text-align: center;
            margin-top: 8px;
        }
        .mobile-menu .mobile-nav-list a.nav-cta:hover {
            background: var(--primary-dark);
        }

        /* ===== 页面Banner ===== */
        .page-banner {
            padding: 120px 0 60px;
            background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 50%, #ede9fe 100%);
            position: relative;
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.10;
            z-index: 0;
        }
        .page-banner .container {
            position: relative;
            z-index: 1;
        }
        .page-banner h1 {
            font-size: 38px;
            font-weight: 800;
            color: var(--dark);
            line-height: 1.2;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }
        .page-banner h1 i {
            color: var(--primary);
        }
        .page-banner p {
            font-size: 18px;
            color: var(--gray-600);
            max-width: 680px;
            line-height: 1.7;
        }
        .page-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--gray-500);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .page-banner .breadcrumb a {
            color: var(--gray-500);
        }
        .page-banner .breadcrumb a:hover {
            color: var(--primary);
        }
        .page-banner .breadcrumb span {
            color: var(--gray-700);
        }
        .page-banner .breadcrumb i {
            font-size: 10px;
            color: var(--gray-400);
        }

        @media (max-width: 768px) {
            .page-banner {
                padding: 100px 0 40px;
                min-height: 200px;
            }
            .page-banner h1 {
                font-size: 26px;
            }
            .page-banner p {
                font-size: 15px;
            }
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 72px 0;
        }
        .section-title {
            font-size: 30px;
            font-weight: 700;
            color: var(--dark);
            text-align: center;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--text-light);
            text-align: center;
            max-width: 600px;
            margin: 0 auto 44px;
            line-height: 1.7;
        }
        .section-title-left {
            text-align: left;
            margin-bottom: 8px;
        }
        .section-subtitle-left {
            text-align: left;
            margin: 0 0 36px;
        }

        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 24px;
            }
            .section-subtitle {
                font-size: 14px;
                margin-bottom: 32px;
            }
        }

        /* ===== 卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .card-grid-2 {
            grid-template-columns: repeat(2, 1fr);
        }
        .card-grid-4 {
            grid-template-columns: repeat(4, 1fr);
        }

        @media (max-width: 1024px) {
            .card-grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .card-grid-2 {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 520px) {
            .card-grid {
                grid-template-columns: 1fr;
            }
            .card-grid-4 {
                grid-template-columns: 1fr;
            }
        }

        /* ===== 卡片组件 ===== */
        .card {
            background: var(--white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 28px 24px;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: transparent;
        }
        .card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: var(--primary-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--primary);
            margin-bottom: 18px;
            flex-shrink: 0;
        }
        .card .card-icon.icon-secondary {
            background: #fef3c7;
            color: var(--accent);
        }
        .card .card-icon.icon-success {
            background: #d1fae5;
            color: var(--success);
        }
        .card .card-icon.icon-danger {
            background: #fee2e2;
            color: var(--danger);
        }
        .card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 8px;
        }
        .card p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
            flex: 1;
        }
        .card .card-tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 12px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 500;
            background: var(--gray-100);
            color: var(--gray-600);
            margin-top: 14px;
            align-self: flex-start;
        }
        .card .card-tag i {
            font-size: 10px;
        }
        .card .card-link {
            margin-top: 16px;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            align-self: flex-start;
        }
        .card .card-link:hover {
            gap: 10px;
        }

        /* ===== 步骤流程 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            background: var(--white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 32px 24px 28px;
            text-align: center;
            transition: var(--transition);
            position: relative;
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: 16px;
            left: 16px;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--primary-bg);
            color: var(--primary);
            font-size: 14px;
            font-weight: 700;
            line-height: 32px;
            text-align: center;
        }
        .step-item .step-icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: var(--primary-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            color: var(--primary);
            margin: 0 auto 18px;
        }
        .step-item h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 6px;
        }
        .step-item p {
            font-size: 13px;
            color: var(--text-light);
            line-height: 1.6;
        }

        @media (max-width: 1024px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== 图文区块 ===== */
        .media-block {
            display: flex;
            align-items: center;
            gap: 48px;
            background: var(--gray-50);
            border-radius: var(--radius-lg);
            padding: 40px 48px;
            border: 1px solid var(--border);
        }
        .media-block.reverse {
            flex-direction: row-reverse;
        }
        .media-block .media-image {
            flex: 0 0 380px;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .media-block .media-image img {
            width: 100%;
            height: 280px;
            object-fit: cover;
        }
        .media-block .media-content {
            flex: 1;
        }
        .media-block .media-content h3 {
            font-size: 24px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 12px;
        }
        .media-block .media-content p {
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .media-block .media-content ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .media-block .media-content ul li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 14px;
            color: var(--gray-700);
        }
        .media-block .media-content ul li i {
            color: var(--success);
            margin-top: 3px;
            font-size: 14px;
            flex-shrink: 0;
        }

        @media (max-width: 1024px) {
            .media-block {
                flex-direction: column;
                padding: 28px 24px;
                gap: 24px;
            }
            .media-block.reverse {
                flex-direction: column;
            }
            .media-block .media-image {
                flex: 0 0 100%;
                width: 100%;
            }
            .media-block .media-image img {
                height: 200px;
            }
        }
        @media (max-width: 520px) {
            .media-block {
                padding: 20px 16px;
            }
            .media-block .media-content h3 {
                font-size: 20px;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-question {
            width: 100%;
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            font-size: 16px;
            font-weight: 600;
            color: var(--dark);
            background: none;
            border: none;
            text-align: left;
            cursor: pointer;
            transition: var(--transition);
        }
        .faq-question i {
            font-size: 14px;
            color: var(--gray-400);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-question.open i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.8;
        }
        .faq-answer.open {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
            color: var(--white);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 16px;
            opacity: 0.9;
            max-width: 560px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .cta-section .cta-buttons {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .cta-section .btn-white {
            background: var(--white);
            color: var(--primary);
            padding: 14px 36px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .cta-section .btn-white:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.20);
            color: var(--primary);
        }
        .cta-section .btn-outline-white {
            background: transparent;
            color: var(--white);
            padding: 14px 36px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            border: 2px solid rgba(255, 255, 255, 0.5);
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .cta-section .btn-outline-white:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: var(--white);
            transform: translateY(-2px);
        }

        @media (max-width: 768px) {
            .cta-section {
                padding: 36px 20px;
            }
            .cta-section h2 {
                font-size: 24px;
            }
            .cta-section p {
                font-size: 14px;
            }
            .cta-section .btn-white,
            .cta-section .btn-outline-white {
                padding: 12px 28px;
                font-size: 14px;
            }
        }

        /* ===== 标签列表 ===== */
        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 500;
            background: var(--gray-100);
            color: var(--gray-700);
            transition: var(--transition);
            border: 1px solid transparent;
        }
        .tag:hover {
            background: var(--primary-bg);
            color: var(--primary);
            border-color: var(--primary-light);
        }
        .tag.tag-primary {
            background: var(--primary-bg);
            color: var(--primary);
            border-color: var(--primary-light);
        }
        .tag i {
            font-size: 11px;
        }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            padding: 28px 16px;
            background: var(--white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .stat-item:hover {
            box-shadow: var(--shadow);
            transform: translateY(-2px);
        }
        .stat-item .stat-number {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.1;
            margin-bottom: 6px;
        }
        .stat-item .stat-label {
            font-size: 14px;
            color: var(--text-light);
        }

        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-item .stat-number {
                font-size: 28px;
            }
        }

        /* ===== 内容列表 ===== */
        .content-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .content-item {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 20px 24px;
            background: var(--white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .content-item:hover {
            box-shadow: var(--shadow);
            border-color: transparent;
            transform: translateX(4px);
        }
        .content-item .item-index {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary-bg);
            color: var(--primary);
            font-size: 14px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .content-item .item-text {
            flex: 1;
        }
        .content-item .item-text h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--dark);
            margin-bottom: 2px;
        }
        .content-item .item-text p {
            font-size: 13px;
            color: var(--text-light);
        }
        .content-item .item-link {
            color: var(--gray-400);
            font-size: 14px;
            flex-shrink: 0;
        }
        .content-item .item-link:hover {
            color: var(--primary);
            transform: translateX(4px);
        }

        @media (max-width: 520px) {
            .content-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
                padding: 16px 18px;
            }
            .content-item .item-link {
                align-self: flex-end;
            }
        }

        /* ===== 页码 ===== */
        .pagination {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            margin-top: 44px;
        }
        .pagination a,
        .pagination span {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 500;
            color: var(--gray-600);
            background: var(--white);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .pagination a:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-bg);
        }
        .pagination .active {
            background: var(--primary);
            color: var(--white);
            border-color: var(--primary);
        }
        .pagination .disabled {
            opacity: 0.4;
            pointer-events: none;
        }
        .pagination .next,
        .pagination .prev {
            width: auto;
            padding: 0 16px;
            gap: 6px;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--dark);
            color: rgba(255, 255, 255, 0.85);
            padding: 60px 0 0;
            margin-top: 72px;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo {
            color: var(--white);
            font-size: 22px;
            margin-bottom: 14px;
        }
        .footer-brand .logo i {
            color: var(--primary-light);
        }
        .footer-brand .logo span {
            color: var(--primary-light);
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.6);
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--white);
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 28px;
            height: 2.5px;
            border-radius: 4px;
            background: var(--primary);
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--white);
            transform: translateX(4px);
        }
        .footer-col ul li a i {
            font-size: 13px;
            color: var(--primary-light);
        }
        .footer-bottom {
            text-align: center;
            padding: 24px 0;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
            line-height: 1.6;
        }

        @media (max-width: 1024px) {
            .footer-inner {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-brand {
                grid-column: 1;
            }
            .site-footer {
                padding: 40px 0 0;
                margin-top: 48px;
            }
        }

        /* ===== 响应式导航 ===== */
        @media (max-width: 820px) {
            .nav-list {
                display: none;
            }
            .nav-search-wrap {
                max-width: 280px;
                margin: 0 8px;
            }
            .hamburger {
                display: flex;
            }
        }
        @media (max-width: 520px) {
            .nav-search-wrap {
                max-width: 160px;
            }
            .nav-search-wrap .search-input {
                padding: 8px 12px 8px 36px;
                font-size: 13px;
            }
            .nav-search-wrap .search-icon {
                left: 12px;
                font-size: 13px;
            }
            .logo {
                font-size: 18px;
            }
            .logo i {
                font-size: 20px;
            }
        }

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

        /* ===== 分类特有装饰 ===== */
        .guide-hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            background: rgba(37, 99, 235, 0.10);
            color: var(--primary);
            border-radius: 50px;
            font-size: 13px;
            font-weight: 500;
            margin-bottom: 16px;
        }
        .guide-hero-badge i {
            font-size: 12px;
        }

        .tooltip-box {
            background: var(--primary-bg);
            border-left: 4px solid var(--primary);
            padding: 16px 20px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-size: 14px;
            color: var(--gray-700);
            margin-top: 16px;
        }
        .tooltip-box i {
            color: var(--primary);
            margin-right: 8px;
        }

        .warning-box {
            background: #fffbeb;
            border-left: 4px solid var(--accent);
            padding: 16px 20px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-size: 14px;
            color: var(--gray-700);
            margin-top: 16px;
        }
        .warning-box i {
            color: var(--accent);
            margin-right: 8px;
        }

        .success-box {
            background: #ecfdf5;
            border-left: 4px solid var(--success);
            padding: 16px 20px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-size: 14px;
            color: var(--gray-700);
            margin-top: 16px;
        }
        .success-box i {
            color: var(--success);
            margin-right: 8px;
        }

/* roulang page: article */
:root {
    --primary: #1a56db;
    --primary-dark: #1e40af;
    --primary-light: #dbeafe;
    --primary-bg: #eff6ff;
    --accent: #f59e0b;
    --accent-light: #fef3c7;
    --accent-dark: #d97706;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --bg-card: #ffffff;
    --text: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05), 0 1px 3px rgba(0,0,0,0.06);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0,0,0,0.12);
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
    --max-width: 1200px;
    --header-h: 72px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: var(--font); font-size: 16px; line-height: 1.7; color: var(--text); background: var(--bg); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
@media (max-width: 768px) { .container { padding: 0 16px; } }

/* Header & Nav */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,0.96); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); height: var(--header-h); transition: box-shadow var(--transition); }
.site-header.scrolled { box-shadow: var(--shadow); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }
.logo { display: flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 800; color: var(--text); letter-spacing: -0.3px; white-space: nowrap; }
.logo i { color: var(--primary); font-size: 26px; }
.logo span { color: var(--primary); font-weight: 700; }
.nav-list { display: flex; align-items: center; gap: 4px; }
.nav-list a { display: inline-flex; align-items: center; gap: 6px; padding: 8px 18px; border-radius: var(--radius); font-size: 15px; font-weight: 500; color: var(--text-secondary); transition: all var(--transition); position: relative; white-space: nowrap; }
.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: 2px; background: var(--primary); }
.nav-list a.nav-cta { background: var(--primary); color: #fff; padding: 8px 22px; border-radius: var(--radius); font-weight: 600; box-shadow: 0 2px 8px rgba(26,86,219,0.25); }
.nav-list a.nav-cta:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(26,86,219,0.35); }
.nav-list a.nav-cta i { font-size: 14px; }
.mobile-toggle { display: none; background: none; border: none; font-size: 24px; color: var(--text); cursor: pointer; padding: 8px; border-radius: var(--radius-sm); transition: background var(--transition); }
.mobile-toggle:hover { background: var(--bg-alt); }
@media (max-width: 768px) {
    .nav-list { display: none; position: absolute; top: var(--header-h); left: 0; right: 0; background: var(--bg); flex-direction: column; padding: 16px 24px 24px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow-md); gap: 2px; }
    .nav-list.open { display: flex; }
    .nav-list a { width: 100%; padding: 12px 16px; border-radius: var(--radius-sm); font-size: 16px; }
    .nav-list a.active::after { display: none; }
    .nav-list a.nav-cta { margin-top: 8px; text-align: center; justify-content: center; }
    .mobile-toggle { display: flex; align-items: center; justify-content: center; }
}

/* Article Banner */
.article-banner { position: relative; margin-top: var(--header-h); padding: 80px 0 60px; background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0f172a 100%); overflow: hidden; min-height: 320px; display: flex; align-items: center; }
.article-banner::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat; opacity: 0.15; mix-blend-mode: overlay; }
.article-banner::after { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 30% 50%, rgba(26,86,219,0.15) 0%, transparent 70%); }
.article-banner .container { position: relative; z-index: 2; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 14px; color: rgba(255,255,255,0.6); margin-bottom: 20px; flex-wrap: wrap; }
.breadcrumb a { color: rgba(255,255,255,0.7); transition: color var(--transition); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb .sep { color: rgba(255,255,255,0.4); }
.breadcrumb .current { color: rgba(255,255,255,0.9); }
.article-banner h1 { font-size: 36px; font-weight: 800; color: #fff; line-height: 1.25; max-width: 800px; margin-bottom: 16px; letter-spacing: -0.5px; }
.article-meta { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; font-size: 14px; color: rgba(255,255,255,0.7); }
.article-meta .badge { display: inline-flex; align-items: center; gap: 6px; background: var(--primary); color: #fff; padding: 4px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; }
.article-meta .badge i { font-size: 12px; }
.article-meta .date i { margin-right: 6px; }
@media (max-width: 768px) {
    .article-banner { padding: 60px 0 40px; min-height: 240px; }
    .article-banner h1 { font-size: 26px; }
    .breadcrumb { font-size: 13px; }
}
@media (max-width: 520px) {
    .article-banner h1 { font-size: 22px; }
    .article-meta { gap: 10px; font-size: 13px; }
}

/* Article Content */
.article-content { padding: 60px 0; background: var(--bg); }
.content-wrapper { display: grid; grid-template-columns: 1fr 320px; gap: 48px; align-items: start; }
.content-body { min-width: 0; }
.content-body .article-body { background: var(--bg-card); border-radius: var(--radius-lg); padding: 40px; border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
.content-body .article-body h2 { font-size: 24px; font-weight: 700; margin: 32px 0 16px; color: var(--text); line-height: 1.3; }
.content-body .article-body h3 { font-size: 20px; font-weight: 600; margin: 28px 0 12px; color: var(--text); }
.content-body .article-body p { margin-bottom: 18px; color: var(--text-secondary); line-height: 1.8; }
.content-body .article-body ul, .content-body .article-body ol { margin: 0 0 18px 24px; color: var(--text-secondary); line-height: 1.8; }
.content-body .article-body li { margin-bottom: 8px; list-style: disc; }
.content-body .article-body ol li { list-style: decimal; }
.content-body .article-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
.content-body .article-body a:hover { color: var(--primary-dark); }
.content-body .article-body blockquote { border-left: 4px solid var(--primary); background: var(--primary-bg); padding: 16px 24px; margin: 20px 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-secondary); font-style: normal; }
.content-body .article-body blockquote p:last-child { margin-bottom: 0; }
.content-body .article-body code { background: var(--bg-alt); padding: 2px 8px; border-radius: 4px; font-size: 0.9em; color: var(--primary-dark); }
.content-body .article-body pre { background: #1e293b; color: #e2e8f0; padding: 20px 24px; border-radius: var(--radius); overflow-x: auto; margin: 20px 0; font-size: 14px; line-height: 1.6; }
.content-body .article-body pre code { background: none; padding: 0; color: inherit; font-size: inherit; }
.content-body .article-body img { border-radius: var(--radius); margin: 24px 0; box-shadow: var(--shadow); }
.content-body .article-body hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }
.content-body .article-body table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 15px; }
.content-body .article-body th, .content-body .article-body td { border: 1px solid var(--border); padding: 12px 16px; text-align: left; }
.content-body .article-body th { background: var(--bg-alt); font-weight: 600; color: var(--text); }
.content-body .article-body td { color: var(--text-secondary); }
.not-found { text-align: center; padding: 80px 40px; background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
.not-found i { font-size: 56px; color: var(--text-muted); margin-bottom: 20px; display: block; }
.not-found h2 { font-size: 28px; font-weight: 700; color: var(--text); margin-bottom: 12px; }
.not-found p { color: var(--text-secondary); margin-bottom: 24px; font-size: 16px; }
.not-found .btn { display: inline-flex; align-items: center; gap: 8px; }

/* Sidebar */
.content-sidebar { display: flex; flex-direction: column; gap: 28px; }
.sidebar-card { background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border); padding: 28px; box-shadow: var(--shadow-sm); }
.sidebar-card h3 { font-size: 17px; font-weight: 700; color: var(--text); margin-bottom: 16px; padding-bottom: 12px; border-bottom: 2px solid var(--primary-light); display: flex; align-items: center; gap: 8px; }
.sidebar-card h3 i { color: var(--primary); font-size: 16px; }
.sidebar-card ul li { margin-bottom: 10px; }
.sidebar-card ul li a { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-radius: var(--radius-sm); color: var(--text-secondary); transition: all var(--transition); font-size: 14px; }
.sidebar-card ul li a:hover { background: var(--primary-bg); color: var(--primary); }
.sidebar-card ul li a i { color: var(--primary); font-size: 13px; width: 18px; text-align: center; }
.sidebar-cta { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); color: #fff; border: none; text-align: center; }
.sidebar-cta h3 { color: #fff; border-bottom-color: rgba(255,255,255,0.2); }
.sidebar-cta h3 i { color: #fff; }
.sidebar-cta p { color: rgba(255,255,255,0.8); font-size: 14px; margin-bottom: 16px; }
.sidebar-cta .btn { background: #fff; color: var(--primary); font-weight: 700; padding: 10px 24px; border-radius: var(--radius); display: inline-flex; align-items: center; gap: 8px; transition: all var(--transition); }
.sidebar-cta .btn:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
@media (max-width: 1024px) {
    .content-wrapper { grid-template-columns: 1fr 260px; gap: 32px; }
}
@media (max-width: 768px) {
    .content-wrapper { grid-template-columns: 1fr; gap: 32px; }
    .content-body .article-body { padding: 24px 20px; }
    .sidebar-card { padding: 20px; }
}

/* Related Posts */
.related-posts { padding: 60px 0; background: var(--bg-alt); }
.related-posts .section-title { text-align: center; margin-bottom: 40px; }
.related-posts .section-title h2 { font-size: 28px; font-weight: 800; color: var(--text); letter-spacing: -0.3px; }
.related-posts .section-title p { color: var(--text-muted); margin-top: 8px; font-size: 16px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.related-card { background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; transition: all var(--transition); box-shadow: var(--shadow-sm); }
.related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--primary-light); }
.related-card .card-img { width: 100%; height: 180px; object-fit: cover; background: var(--bg-alt); }
.related-card .card-body { padding: 20px 22px 22px; }
.related-card .card-body h3 { font-size: 17px; font-weight: 700; color: var(--text); margin-bottom: 8px; line-height: 1.4; }
.related-card .card-body h3 a { color: inherit; }
.related-card .card-body h3 a:hover { color: var(--primary); }
.related-card .card-body p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.related-card .card-footer { display: flex; align-items: center; justify-content: space-between; padding: 12px 22px; border-top: 1px solid var(--border-light); font-size: 13px; color: var(--text-muted); }
.related-card .card-footer .tag { display: inline-flex; align-items: center; gap: 4px; color: var(--primary); font-weight: 500; }
@media (max-width: 768px) {
    .related-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
}
@media (max-width: 520px) {
    .related-grid { grid-template-columns: 1fr; gap: 16px; }
    .related-card .card-img { height: 160px; }
}

/* CTA Section */
.cta-section { padding: 64px 0; background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%); position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat; opacity: 0.08; mix-blend-mode: overlay; }
.cta-section .container { position: relative; z-index: 2; text-align: center; }
.cta-section h2 { font-size: 30px; font-weight: 800; color: #fff; margin-bottom: 12px; letter-spacing: -0.3px; }
.cta-section p { font-size: 17px; color: rgba(255,255,255,0.75); margin-bottom: 28px; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-section .btn-group { display: flex; align-items: center; justify-content: center; gap: 16px; flex-wrap: wrap; }
.cta-section .btn-primary { background: var(--accent); color: #0f172a; padding: 14px 36px; border-radius: var(--radius); font-weight: 700; font-size: 16px; display: inline-flex; align-items: center; gap: 10px; transition: all var(--transition); box-shadow: 0 4px 16px rgba(245,158,11,0.35); }
.cta-section .btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 6px 24px rgba(245,158,11,0.45); color: #fff; }
.cta-section .btn-outline { border: 2px solid rgba(255,255,255,0.3); color: #fff; padding: 12px 32px; border-radius: var(--radius); font-weight: 600; font-size: 16px; display: inline-flex; align-items: center; gap: 10px; transition: all var(--transition); }
.cta-section .btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.1); color: #fff; }
@media (max-width: 768px) {
    .cta-section h2 { font-size: 24px; }
    .cta-section p { font-size: 15px; }
}

/* Footer */
.site-footer { background: #0f172a; color: rgba(255,255,255,0.7); padding: 56px 0 28px; }
.footer-inner { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 32px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.footer-brand .logo { color: #fff; font-size: 22px; margin-bottom: 16px; }
.footer-brand .logo i { color: var(--accent); }
.footer-brand .logo span { color: var(--accent); }
.footer-brand p { font-size: 14px; line-height: 1.7; color: rgba(255,255,255,0.55); max-width: 340px; }
.footer-col h4 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 16px; 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: 14px; transition: all var(--transition); display: inline-flex; align-items: center; gap: 6px; }
.footer-col ul li a:hover { color: var(--accent); padding-left: 4px; }
.footer-col ul li a i { font-size: 13px; width: 18px; }
.footer-bottom { text-align: center; padding-top: 24px; font-size: 13px; color: rgba(255,255,255,0.4); }
@media (max-width: 768px) {
    .footer-inner { grid-template-columns: 1fr 1fr; gap: 32px 24px; }
    .footer-brand { grid-column: 1 / -1; }
    .footer-brand p { max-width: 100%; }
}
@media (max-width: 520px) {
    .footer-inner { grid-template-columns: 1fr; gap: 24px; }
    .site-footer { padding: 40px 0 24px; }
}

/* Utility */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 24px; border-radius: var(--radius); font-weight: 600; font-size: 15px; transition: all var(--transition); cursor: pointer; border: none; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 2px 8px rgba(26,86,219,0.2); }
.btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(26,86,219,0.3); }
.btn-outline { border: 2px solid var(--border); color: var(--text-secondary); background: transparent; }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-bg); }
.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; }

/* Article Nav (prev/next) */
.article-nav { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border); }
.article-nav a { display: flex; align-items: center; gap: 8px; padding: 10px 18px; border-radius: var(--radius); background: var(--bg-alt); color: var(--text-secondary); font-size: 14px; font-weight: 500; transition: all var(--transition); max-width: 45%; }
.article-nav a:hover { background: var(--primary-bg); color: var(--primary); }
.article-nav a i { font-size: 14px; }
.article-nav .nav-next { text-align: right; flex-direction: row-reverse; }
@media (max-width: 520px) {
    .article-nav { flex-direction: column; align-items: stretch; }
    .article-nav a { max-width: 100%; justify-content: center; }
}