/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #d4a853;
            --primary-dark: #b8912e;
            --primary-light: #e8c97a;
            --secondary: #1e2a4a;
            --secondary-light: #2c3e6b;
            --accent: #f0c040;
            --bg-dark: #0a0e17;
            --bg-card: #111827;
            --bg-card-hover: #1a2332;
            --bg-section: #0f1623;
            --bg-light: #1b2538;
            --text-white: #f0f2f5;
            --text-light: #c8cdd6;
            --text-muted: #8892a4;
            --text-dark: #e0e3e8;
            --border-color: rgba(212, 168, 83, 0.15);
            --border-light: rgba(255, 255, 255, 0.06);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.6);
            --shadow-glow: 0 0 30px rgba(212, 168, 83, 0.15);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --header-height: 76px;
            --tab-height: 64px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font-sans);
            background: var(--bg-dark);
            color: var(--text-white);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-bottom: var(--tab-height);
        }
        @media (min-width: 768px) { body { padding-bottom: 0; } }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-light); }
        a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
        button { cursor: pointer; font-family: inherit; font-size: inherit; border: none; background: none; color: inherit; }
        button:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 6px; }
        input, textarea { font-family: inherit; font-size: inherit; border: none; outline: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text-white); }
        ::selection { background: var(--primary); color: var(--bg-dark); }

        /* ===== 容器 ===== */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 520px) { .container { padding: 0 16px; } }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 14, 23, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: var(--header-height);
            display: flex;
            align-items: center;
            transition: var(--transition);
        }
        .site-header.scrolled { background: rgba(10, 14, 23, 0.98); box-shadow: var(--shadow-md); }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: 0.5px;
            transition: var(--transition);
        }
        .logo:hover { color: var(--primary); transform: scale(1.02); }
        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--bg-dark);
            font-weight: 900;
            flex-shrink: 0;
        }
        .logo-text { background: linear-gradient(135deg, var(--text-white), var(--primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav-desktop { display: flex; align-items: center; gap: 8px; }
        .nav-desktop a {
            padding: 10px 20px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-light);
            transition: var(--transition);
            position: relative;
        }
        .nav-desktop a:hover { color: var(--text-white); background: rgba(212, 168, 83, 0.08); }
        .nav-desktop a.active { color: var(--primary); background: rgba(212, 168, 83, 0.12); }
        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
        }
        .nav-cta {
            padding: 10px 28px !important;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark)) !important;
            color: var(--bg-dark) !important;
            border-radius: var(--radius-md) !important;
            font-weight: 700 !important;
            box-shadow: var(--shadow-glow);
        }
        .nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(212,168,83,0.35) !important; background: linear-gradient(135deg, var(--primary-light), var(--primary)) !important; color: var(--bg-dark) !important; }

        /* ===== 移动端底部Tab ===== */
        .bottom-tabs {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 999;
            display: flex;
            align-items: center;
            justify-content: space-around;
            background: rgba(10, 14, 23, 0.96);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-top: 1px solid var(--border-light);
            height: var(--tab-height);
            padding: 0 8px;
        }
        @media (min-width: 768px) { .bottom-tabs { display: none; } }
        .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            color: var(--text-muted);
            font-size: 0.65rem;
            font-weight: 500;
            transition: var(--transition);
            min-width: 56px;
            text-decoration: none;
        }
        .tab-item i { font-size: 1.25rem; transition: var(--transition); }
        .tab-item.active { color: var(--primary); }
        .tab-item.active i { transform: scale(1.1); text-shadow: 0 0 20px rgba(212,168,83,0.3); }
        .tab-item:hover { color: var(--text-light); }
        .tab-center {
            width: 52px;
            height: 52px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--bg-dark);
            font-size: 1.5rem;
            font-weight: 800;
            box-shadow: 0 4px 20px rgba(212,168,83,0.3);
            transform: translateY(-6px);
            transition: var(--transition);
            text-decoration: none;
        }
        .tab-center:hover { transform: translateY(-8px) scale(1.05); box-shadow: 0 8px 30px rgba(212,168,83,0.45); }
        .tab-center i { font-size: 1.4rem; }

        /* ===== Hero 首屏 ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: calc(var(--header-height) + 40px) 24px 60px;
            overflow: hidden;
            background: var(--bg-dark);
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            transform: scale(1.05);
            animation: heroParallax 20s ease-in-out infinite alternate;
        }
        @keyframes heroParallax {
            0% { transform: scale(1.05) translate(0, 0); }
            100% { transform: scale(1.12) translate(-10px, -10px); }
        }
        .hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(10,14,23,0.85) 0%, rgba(10,14,23,0.5) 40%, rgba(10,14,23,0.85) 100%);
            z-index: 1;
        }
        .hero-overlay-glow {
            position: absolute;
            top: 20%;
            left: 50%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(212,168,83,0.08) 0%, transparent 70%);
            transform: translate(-50%, -50%);
            pointer-events: none;
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 800px;
            width: 100%;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            background: rgba(212,168,83,0.12);
            border: 1px solid rgba(212,168,83,0.25);
            border-radius: 50px;
            font-size: 0.85rem;
            color: var(--primary-light);
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }
        .hero-badge i { font-size: 0.75rem; }
        .hero-title {
            font-size: clamp(2.4rem, 6vw, 4.2rem);
            font-weight: 900;
            line-height: 1.1;
            margin-bottom: 20px;
            background: linear-gradient(135deg, var(--text-white) 30%, var(--primary-light) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-sub {
            font-size: clamp(1rem, 2vw, 1.25rem);
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            align-items: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            text-decoration: none;
            cursor: pointer;
            border: none;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: var(--bg-dark);
            box-shadow: 0 4px 20px rgba(212,168,83,0.3);
        }
        .btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 40px rgba(212,168,83,0.4); color: var(--bg-dark); }
        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border: 1.5px solid rgba(255,255,255,0.2);
        }
        .btn-outline:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-3px); background: rgba(212,168,83,0.05); }
        .btn-lg { padding: 16px 44px; font-size: 1.05rem; }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            justify-content: center;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        .hero-stat { text-align: center; }
        .hero-stat-num { font-size: 1.8rem; font-weight: 800; color: var(--primary); }
        .hero-stat-label { font-size: 0.85rem; color: var(--text-muted); margin-top: 2px; }

        /* ===== 板块通用 ===== */
        .section {
            padding: 80px 0;
            position: relative;
        }
        @media (max-width: 768px) { .section { padding: 56px 0; } }
        .section-dark { background: var(--bg-section); }
        .section-header {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
        }
        .section-tag {
            display: inline-block;
            padding: 4px 16px;
            background: rgba(212,168,83,0.1);
            border: 1px solid rgba(212,168,83,0.2);
            border-radius: 50px;
            font-size: 0.8rem;
            color: var(--primary-light);
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }
        .section-title {
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            font-weight: 800;
            margin-bottom: 12px;
        }
        .section-desc {
            color: var(--text-muted);
            font-size: 1.05rem;
            line-height: 1.7;
        }

        /* ===== 特色卡片 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            opacity: 0;
            transition: var(--transition);
        }
        .feature-card:hover { transform: translateY(-6px); border-color: rgba(212,168,83,0.2); box-shadow: var(--shadow-lg); background: var(--bg-card-hover); }
        .feature-card:hover::before { opacity: 1; }
        .feature-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, rgba(212,168,83,0.15), rgba(212,168,83,0.05));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: 18px;
        }
        .feature-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; }
        .feature-card p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.7; }

        /* ===== 分类入口 ===== */
        .category-showcase {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            min-height: 260px;
            display: flex;
            align-items: flex-end;
        }
        .category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: rgba(212,168,83,0.2); }
        .category-card-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.2;
            transition: var(--transition);
        }
        .category-card:hover .category-card-bg { opacity: 0.3; transform: scale(1.05); }
        .category-card-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 40%, rgba(10,14,23,0.9) 100%);
        }
        .category-card-content {
            position: relative;
            z-index: 2;
            padding: 28px;
            width: 100%;
        }
        .category-card-content h3 { font-size: 1.4rem; font-weight: 700; margin-bottom: 6px; }
        .category-card-content p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 16px; }
        .category-card-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--primary);
            font-weight: 600;
            font-size: 0.95rem;
        }
        .category-card-link i { transition: var(--transition); }
        .category-card:hover .category-card-link i { transform: translateX(4px); }

        /* ===== 资讯列表 ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }
        .news-card {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition);
        }
        .news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: rgba(212,168,83,0.15); }
        .news-card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-bottom: 1px solid var(--border-light);
        }
        .news-card-body { padding: 20px 24px 24px; }
        .news-card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        .news-card-meta .tag {
            padding: 2px 12px;
            background: rgba(212,168,83,0.1);
            border-radius: 50px;
            color: var(--primary-light);
            font-size: 0.75rem;
        }
        .news-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
        .news-card h3 a { color: var(--text-white); }
        .news-card h3 a:hover { color: var(--primary); }
        .news-card p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 24px;
            color: var(--text-muted);
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px dashed var(--border-color);
        }
        .news-empty i { font-size: 2rem; margin-bottom: 12px; color: var(--primary); opacity: 0.5; }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 24px;
            text-align: center;
        }
        .stat-card {
            padding: 32px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .stat-card:hover { border-color: rgba(212,168,83,0.2); transform: translateY(-2px); }
        .stat-number { font-size: 2.4rem; font-weight: 900; color: var(--primary); line-height: 1.2; }
        .stat-label { color: var(--text-muted); font-size: 0.9rem; margin-top: 6px; }

        /* ===== 流程步骤 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            counter-reset: step;
        }
        .step-card {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            position: relative;
            transition: var(--transition);
        }
        .step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: rgba(212,168,83,0.15); }
        .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: var(--bg-dark);
            font-weight: 800;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
        }
        .step-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
        .step-card p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.6; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 760px; margin: 0 auto; }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: rgba(212,168,83,0.15); }
        .faq-question {
            width: 100%;
            padding: 20px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            text-align: left;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-white);
            background: transparent;
            transition: var(--transition);
            cursor: pointer;
        }
        .faq-question:hover { color: var(--primary-light); }
        .faq-question i { font-size: 0.85rem; color: var(--primary); transition: var(--transition); flex-shrink: 0; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 20px; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, rgba(212,168,83,0.08), rgba(212,168,83,0.02));
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .cta-box {
            text-align: center;
            max-width: 640px;
            margin: 0 auto;
            padding: 20px 0;
        }
        .cta-box h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin-bottom: 12px; }
        .cta-box p { color: var(--text-muted); font-size: 1.05rem; margin-bottom: 28px; }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-section);
            border-top: 1px solid var(--border-light);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        @media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr; gap: 32px; } }
        .footer-brand .logo { font-size: 1.25rem; margin-bottom: 12px; }
        .footer-brand p { color: var(--text-muted); font-size: 0.9rem; max-width: 320px; line-height: 1.7; }
        .footer-links h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 16px; color: var(--text-white); }
        .footer-links a {
            display: block;
            padding: 4px 0;
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .footer-links a:hover { color: var(--primary); }
        .footer-bottom {
            border-top: 1px solid var(--border-light);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .footer-bottom a { color: var(--text-muted); }
        .footer-bottom a:hover { color: var(--primary); }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .hero-title { font-size: clamp(2rem, 5vw, 3.2rem); }
            .features-grid { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
        }
        @media (max-width: 768px) {
            :root { --header-height: 64px; }
            .site-header { height: var(--header-height); }
            .nav-desktop { display: none; }
            .hero { min-height: 90vh; padding: calc(var(--header-height) + 24px) 16px 40px; }
            .hero-title { font-size: clamp(1.8rem, 7vw, 2.6rem); }
            .hero-sub { font-size: 0.95rem; margin-bottom: 28px; }
            .hero-stats { gap: 20px; margin-top: 32px; }
            .hero-stat-num { font-size: 1.4rem; }
            .section { padding: 44px 0; }
            .section-header { margin-bottom: 32px; }
            .section-title { font-size: 1.6rem; }
            .features-grid { grid-template-columns: 1fr; }
            .category-showcase { grid-template-columns: 1fr; }
            .news-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .steps-grid { grid-template-columns: 1fr; gap: 20px; }
            .stat-number { font-size: 1.8rem; }
            .btn-lg { padding: 14px 32px; font-size: 0.95rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }
        @media (max-width: 520px) {
            .hero { min-height: 85vh; padding-top: calc(var(--header-height) + 16px); }
            .hero-title { font-size: 1.6rem; }
            .hero-badge { font-size: 0.75rem; padding: 4px 14px; }
            .hero-actions { flex-direction: column; width: 100%; }
            .hero-actions .btn { width: 100%; justify-content: center; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
            .stat-card { padding: 20px 12px; }
            .news-card-body { padding: 16px 18px 20px; }
            .faq-question { padding: 16px 18px; font-size: 0.95rem; }
        }

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

        /* ===== 动画 ===== */
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .animate-in { animation: fadeInUp 0.6s ease forwards; }
        .animate-in-delay-1 { animation-delay: 0.1s; }
        .animate-in-delay-2 { animation-delay: 0.2s; }
        .animate-in-delay-3 { animation-delay: 0.3s; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a2a6c;
            --primary-light: #2d4a8e;
            --primary-dark: #0f1a44;
            --accent: #e8b830;
            --accent-light: #f0d060;
            --accent-dark: #c9a020;
            --bg-dark: #0b0f1a;
            --bg-section: #121726;
            --bg-card: #1a2140;
            --bg-card-hover: #222b50;
            --text-primary: #f0f2f8;
            --text-secondary: #b0b8d0;
            --text-muted: #6a7290;
            --border-color: rgba(232, 184, 48, 0.15);
            --border-light: rgba(255, 255, 255, 0.06);
            --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 16px 56px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --container-max: 1200px;
            --header-h: 72px;
            --tab-h: 64px;
        }

        /* ===== 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);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-dark);
            padding-top: var(--header-h);
            padding-bottom: var(--tab-h);
            min-height: 100vh;
        }
        @media (min-width: 769px) {
            body {
                padding-bottom: 0;
            }
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-light);
        }
        a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 4px;
            border-radius: 4px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
            background: transparent;
            color: inherit;
        }
        button {
            cursor: pointer;
        }
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: 4px;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
        }

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

        /* ===== Header / Nav Desktop ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-h);
            background: rgba(11, 15, 26, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-light);
            z-index: 1000;
            transition: var(--transition);
        }
        .site-header.scrolled {
            background: rgba(11, 15, 26, 0.98);
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-primary);
            font-weight: 700;
            font-size: 22px;
            transition: var(--transition);
        }
        .logo:hover {
            color: var(--accent);
        }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: var(--bg-dark);
            border-radius: var(--radius-sm);
            font-size: 20px;
            font-weight: 800;
        }
        .logo-text {
            letter-spacing: 0.5px;
        }
        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-desktop a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 15px;
            transition: var(--transition);
            position: relative;
        }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%) scaleX(0);
            width: 60%;
            height: 2px;
            background: var(--accent);
            border-radius: 4px;
            transition: var(--transition);
        }
        .nav-desktop a:hover {
            color: var(--text-primary);
            background: rgba(232, 184, 48, 0.06);
        }
        .nav-desktop a:hover::after {
            transform: translateX(-50%) scaleX(1);
        }
        .nav-desktop a.active {
            color: var(--accent);
            background: rgba(232, 184, 48, 0.1);
        }
        .nav-desktop a.active::after {
            transform: translateX(-50%) scaleX(1);
        }
        .nav-cta {
            background: linear-gradient(135deg, var(--accent), var(--accent-dark)) !important;
            color: var(--bg-dark) !important;
            padding: 10px 24px !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 600 !important;
            display: flex;
            align-items: center;
            gap: 6px;
            box-shadow: 0 4px 20px rgba(232, 184, 48, 0.25);
        }
        .nav-cta::after {
            display: none !important;
        }
        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(232, 184, 48, 0.35) !important;
            background: linear-gradient(135deg, var(--accent-light), var(--accent)) !important;
            color: var(--bg-dark) !important;
        }
        .nav-cta i {
            font-size: 14px;
            transition: var(--transition);
        }
        .nav-cta:hover i {
            transform: translateX(4px);
        }

        /* ===== Mobile Bottom Tab ===== */
        .mobile-tab-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            height: var(--tab-h);
            background: rgba(11, 15, 26, 0.96);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-top: 1px solid var(--border-light);
            display: none;
            z-index: 999;
            justify-content: space-around;
            align-items: center;
            padding: 0 8px;
        }
        .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            color: var(--text-muted);
            font-size: 11px;
            font-weight: 500;
            transition: var(--transition);
            min-width: 64px;
            text-decoration: none;
        }
        .tab-item i {
            font-size: 20px;
            transition: var(--transition);
        }
        .tab-item span {
            transition: var(--transition);
        }
        .tab-item:hover {
            color: var(--text-secondary);
            background: rgba(255, 255, 255, 0.04);
        }
        .tab-item.active {
            color: var(--accent);
        }
        .tab-item.active i {
            transform: scale(1.05);
        }
        .tab-item.tab-cta {
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: var(--bg-dark);
            border-radius: var(--radius-sm);
            padding: 6px 20px;
        }
        .tab-item.tab-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(232, 184, 48, 0.3);
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
            .mobile-tab-bar {
                display: flex;
            }
        }

        /* ===== Page Banner ===== */
        .page-banner {
            position: relative;
            padding: 80px 0 72px;
            background:
                linear-gradient(135deg, rgba(11, 15, 26, 0.88) 0%, rgba(18, 23, 38, 0.92) 100%),
                url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            border-bottom: 1px solid var(--border-color);
            overflow: hidden;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(232, 184, 48, 0.08), transparent 70%);
            pointer-events: none;
        }
        .page-banner .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .page-banner h1 {
            font-size: 42px;
            font-weight: 800;
            margin-bottom: 16px;
            background: linear-gradient(135deg, var(--text-primary) 40%, var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-banner p {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto 8px;
            line-height: 1.6;
        }
        .page-banner .breadcrumb {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 8px;
            margin-top: 20px;
            font-size: 14px;
            color: var(--text-muted);
        }
        .page-banner .breadcrumb a {
            color: var(--text-secondary);
        }
        .page-banner .breadcrumb a:hover {
            color: var(--accent);
        }
        .page-banner .breadcrumb i {
            font-size: 12px;
            color: var(--text-muted);
        }
        @media (max-width: 768px) {
            .page-banner {
                padding: 56px 0 48px;
            }
            .page-banner h1 {
                font-size: 28px;
            }
            .page-banner p {
                font-size: 15px;
            }
        }

        /* ===== Section共用 ===== */
        .section {
            padding: 72px 0;
        }
        .section-alt {
            background: var(--bg-section);
        }
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--accent);
            margin-bottom: 12px;
        }
        .section-label i {
            font-size: 14px;
        }
        .section-title {
            font-size: 34px;
            font-weight: 800;
            margin-bottom: 12px;
        }
        .section-subtitle {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 640px;
            margin-bottom: 40px;
            line-height: 1.6;
        }
        .section-title.centered,
        .section-subtitle.centered {
            text-align: center;
            margin-left: auto;
            margin-right: auto;
        }
        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 26px;
            }
            .section-subtitle {
                font-size: 15px;
                margin-bottom: 28px;
            }
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .card-grid .card {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 28px 24px 32px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .card-grid .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), var(--accent-light));
            opacity: 0;
            transition: var(--transition);
        }
        .card-grid .card:hover {
            transform: translateY(-6px);
            border-color: rgba(232, 184, 48, 0.2);
            box-shadow: var(--shadow-md);
            background: var(--bg-card-hover);
        }
        .card-grid .card:hover::before {
            opacity: 1;
        }
        .card-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(232, 184, 48, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--accent);
            margin-bottom: 16px;
            transition: var(--transition);
        }
        .card-grid .card:hover .card-icon {
            background: rgba(232, 184, 48, 0.2);
            transform: scale(1.05);
        }
        .card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .card .card-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 20px;
            background: rgba(232, 184, 48, 0.12);
            color: var(--accent);
            margin-top: 12px;
        }
        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 600px) {
            .card-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .card-grid .card {
                padding: 20px 18px 24px;
            }
        }

        /* ===== Steps Timeline ===== */
        .steps-timeline {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 12px;
        }
        .step-item {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 28px 20px 32px;
            text-align: center;
            transition: var(--transition);
            position: relative;
        }
        .step-item:hover {
            transform: translateY(-4px);
            border-color: rgba(232, 184, 48, 0.2);
            box-shadow: var(--shadow-sm);
        }
        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: var(--bg-dark);
            font-weight: 800;
            font-size: 18px;
            margin-bottom: 14px;
        }
        .step-item h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .step-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        @media (max-width: 900px) {
            .steps-timeline {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 500px) {
            .steps-timeline {
                grid-template-columns: 1fr;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(232, 184, 48, 0.15);
        }
        .faq-question {
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-weight: 600;
            font-size: 16px;
            color: var(--text-primary);
            cursor: pointer;
            transition: var(--transition);
            background: transparent;
            width: 100%;
            text-align: left;
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-question i {
            font-size: 16px;
            color: var(--accent);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 72px 0;
            background:
                linear-gradient(135deg, rgba(11, 15, 26, 0.9) 0%, rgba(18, 23, 38, 0.95) 100%),
                url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            text-align: center;
        }
        .cta-section h2 {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-btn-group {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 36px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 16px;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: var(--bg-dark);
            box-shadow: 0 4px 24px rgba(232, 184, 48, 0.25);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 40px rgba(232, 184, 48, 0.35);
            color: var(--bg-dark);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-3px);
            box-shadow: 0 4px 20px rgba(232, 184, 48, 0.1);
        }
        .btn i {
            font-size: 15px;
        }
        .btn-primary i {
            transition: var(--transition);
        }
        .btn-primary:hover i {
            transform: translateX(4px);
        }
        @media (max-width: 768px) {
            .cta-section {
                padding: 48px 0;
            }
            .cta-section h2 {
                font-size: 26px;
            }
            .cta-section p {
                font-size: 15px;
            }
            .btn {
                padding: 12px 28px;
                font-size: 15px;
            }
        }

        /* ===== Content Panel (分类内容区) ===== */
        .content-panel {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 40px 36px;
            margin-top: 16px;
        }
        .content-panel h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .content-panel p {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .content-panel ul {
            list-style: none;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-bottom: 16px;
        }
        .content-panel ul li {
            padding-left: 24px;
            position: relative;
            font-size: 15px;
            color: var(--text-secondary);
        }
        .content-panel ul li::before {
            content: '\f00c';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            left: 0;
            color: var(--accent);
            font-size: 13px;
        }
        .content-panel .highlight-box {
            background: rgba(232, 184, 48, 0.06);
            border-left: 3px solid var(--accent);
            padding: 16px 20px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 16px 0;
            font-size: 15px;
            color: var(--text-secondary);
        }
        .content-panel .highlight-box strong {
            color: var(--accent);
        }
        @media (max-width: 768px) {
            .content-panel {
                padding: 24px 18px;
            }
            .content-panel h3 {
                font-size: 19px;
            }
        }

        /* ===== 图文卡片行 ===== */
        .media-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: center;
            margin-top: 16px;
        }
        .media-row .media-img {
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }
        .media-row .media-img img {
            width: 100%;
            height: 280px;
            object-fit: cover;
            transition: var(--transition);
        }
        .media-row .media-img:hover img {
            transform: scale(1.03);
        }
        .media-row .media-text h3 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .media-row .media-text p {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 12px;
        }
        .media-row .media-text .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 12px;
        }
        .media-row .media-text .tag-list span {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            background: rgba(232, 184, 48, 0.08);
            color: var(--accent);
            border: 1px solid rgba(232, 184, 48, 0.12);
        }
        @media (max-width: 900px) {
            .media-row {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .media-row .media-img img {
                height: 200px;
            }
            .media-row .media-text h3 {
                font-size: 20px;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-section);
            border-top: 1px solid var(--border-light);
            padding: 56px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-brand .logo {
            margin-bottom: 12px;
            font-size: 20px;
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 360px;
        }
        .footer-links h4 {
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .footer-links a {
            display: block;
            font-size: 14px;
            color: var(--text-muted);
            padding: 4px 0;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid var(--border-light);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-brand p {
                max-width: 100%;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== Utility ===== */
        .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;
        }
        .gap-8 {
            gap: 8px;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-dark);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--text-muted);
            border-radius: 8px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-secondary);
        }

        /* ===== Animations ===== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .anim-fade-in {
            animation: fadeInUp 0.6s ease forwards;
        }
        .anim-delay-1 {
            animation-delay: 0.1s;
        }
        .anim-delay-2 {
            animation-delay: 0.2s;
        }
        .anim-delay-3 {
            animation-delay: 0.3s;
        }
        .anim-delay-4 {
            animation-delay: 0.4s;
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
    :root {
        --color-primary: #0a2540;
        --color-primary-light: #1a3a5c;
        --color-accent: #2563eb;
        --color-accent-hover: #1d4ed8;
        --color-accent-light: #e8f0fe;
        --color-cyan: #06b6d4;
        --color-bg: #f4f6f9;
        --color-surface: #ffffff;
        --color-text: #1e293b;
        --color-text-weak: #64748b;
        --color-border: #e2e8f0;
        --color-border-light: #f1f5f9;
        --color-success: #10b981;
        --color-warning: #f59e0b;
        --radius-sm: 8px;
        --radius-md: 12px;
        --radius-lg: 20px;
        --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);
        --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', sans-serif;
        --container-max: 1200px;
        --content-max: 780px;
    }

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

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

    /* ===== 导航 ===== */
    .site-header {
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        position: sticky;
        top: 0;
        z-index: 100;
        box-shadow: var(--shadow-sm);
        height: 72px;
        display: flex;
        align-items: center;
    }
    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
    }
    .logo {
        display: flex;
        align-items: center;
        gap: 10px;
        color: var(--color-primary) !important;
        font-weight: 700;
        font-size: 1.25rem;
    }
    .logo-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 36px;
        background: var(--color-accent);
        color: #fff;
        border-radius: 10px;
        font-size: 1.1rem;
        font-weight: 800;
        letter-spacing: -0.02em;
        box-shadow: 0 2px 8px rgba(37,99,235,0.3);
    }
    .logo-text { letter-spacing: -0.01em; }
    .nav-desktop { display: flex; align-items: center; gap: 32px; }
    .nav-desktop a {
        color: var(--color-text-weak);
        font-weight: 500;
        font-size: 0.95rem;
        position: relative;
        padding: 4px 0;
        transition: color var(--transition);
    }
    .nav-desktop a::after {
        content: '';
        position: absolute;
        left: 0;
        bottom: -2px;
        width: 0;
        height: 2px;
        background: var(--color-accent);
        transition: width var(--transition);
        border-radius: 2px;
    }
    .nav-desktop a:hover { color: var(--color-primary); }
    .nav-desktop a:hover::after { width: 100%; }
    .nav-desktop a.active { color: var(--color-accent); }
    .nav-desktop a.active::after { width: 100%; }
    .nav-cta {
        background: var(--color-accent) !important;
        color: #fff !important;
        padding: 8px 20px !important;
        border-radius: 50px;
        font-weight: 600;
        font-size: 0.9rem;
        display: inline-flex;
        align-items: center;
        gap: 6px;
        transition: background var(--transition), transform var(--transition) !important;
    }
    .nav-cta i { font-size: 0.8rem; transition: transform var(--transition); }
    .nav-cta:hover { background: var(--color-accent-hover) !important; transform: translateY(-1px); }
    .nav-cta:hover i { transform: translateX(3px); }
    .nav-cta::after { display: none !important; }

    /* ===== 移动端底部 Tab 导航 ===== */
    .mobile-bottom-nav {
        display: none;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--color-surface);
        border-top: 1px solid var(--color-border);
        z-index: 99;
        padding: 6px 0 env(safe-area-inset-bottom, 6px) 0;
        box-shadow: 0 -2px 12px rgba(0,0,0,0.06);
        justify-content: space-around;
        align-items: center;
    }
    .mobile-bottom-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 2px;
        color: var(--color-text-weak);
        font-size: 0.7rem;
        font-weight: 500;
        padding: 4px 12px;
        transition: color var(--transition);
        min-width: 64px;
    }
    .mobile-bottom-nav a i { font-size: 1.25rem; }
    .mobile-bottom-nav a.active { color: var(--color-accent); }
    .mobile-bottom-nav a.nav-cta-mobile { color: var(--color-accent); }
    @media (max-width: 768px) {
        .nav-desktop { display: none; }
        .mobile-bottom-nav { display: flex; }
        .site-header { height: 64px; }
        body { padding-bottom: 68px; }
    }
    @media (max-width: 520px) {
        .mobile-bottom-nav a { min-width: 56px; font-size: 0.65rem; padding: 4px 8px; }
        .mobile-bottom-nav a i { font-size: 1.1rem; }
    }

    /* ===== 文章 Hero ===== */
    .article-hero {
        position: relative;
        padding: 80px 0 60px;
        background: var(--color-primary);
        background-image: url('/assets/images/backpic/back-2.png');
        background-size: cover;
        background-position: center;
        background-blend-mode: overlay;
        color: #fff;
        overflow: hidden;
    }
    .article-hero::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(10,37,64,0.88) 0%, rgba(10,37,64,0.70) 100%);
        z-index: 1;
    }
    .article-hero .container { position: relative; z-index: 2; }
    .breadcrumb {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 0.85rem;
        color: rgba(255,255,255,0.7);
        margin-bottom: 24px;
        flex-wrap: wrap;
    }
    .breadcrumb a { color: rgba(255,255,255,0.8); transition: color var(--transition); }
    .breadcrumb a:hover { color: #fff; }
    .breadcrumb i { font-size: 0.6rem; color: rgba(255,255,255,0.4); }
    .breadcrumb .current { color: #fff; font-weight: 500; }
    .article-hero h1 {
        font-size: 2.4rem;
        font-weight: 800;
        color: #fff;
        max-width: 860px;
        line-height: 1.25;
        margin-bottom: 16px;
        letter-spacing: -0.01em;
    }
    .article-meta-hero {
        display: flex;
        flex-wrap: wrap;
        gap: 20px;
        align-items: center;
        font-size: 0.9rem;
        color: rgba(255,255,255,0.75);
    }
    .article-meta-hero .badge {
        display: inline-block;
        background: var(--color-cyan);
        color: var(--color-primary);
        font-weight: 700;
        font-size: 0.75rem;
        padding: 4px 14px;
        border-radius: 50px;
        letter-spacing: 0.02em;
    }
    .article-meta-hero i { margin-right: 4px; }
    @media (max-width: 768px) {
        .article-hero { padding: 48px 0 40px; }
        .article-hero h1 { font-size: 1.6rem; }
        .article-meta-hero { gap: 12px; font-size: 0.8rem; }
    }
    @media (max-width: 520px) {
        .article-hero h1 { font-size: 1.35rem; }
        .article-hero { padding: 36px 0 32px; }
    }

    /* ===== 文章正文区 ===== */
    .article-main {
        padding: 48px 0 64px;
    }
    .article-body {
        background: var(--color-surface);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-md);
        padding: 48px 56px;
        max-width: var(--content-max);
        margin: 0 auto;
    }
    .article-body .content {
        font-size: 1.05rem;
        line-height: 1.85;
        color: var(--color-text);
    }
    .article-body .content p {
        margin-bottom: 1.4em;
    }
    .article-body .content h2,
    .article-body .content h3 {
        margin-top: 1.8em;
        margin-bottom: 0.6em;
        color: var(--color-primary);
    }
    .article-body .content h2 { font-size: 1.5rem; }
    .article-body .content h3 { font-size: 1.2rem; }
    .article-body .content ul,
    .article-body .content ol {
        margin-bottom: 1.4em;
        padding-left: 1.6em;
    }
    .article-body .content ul { list-style: disc; }
    .article-body .content ol { list-style: decimal; }
    .article-body .content li { margin-bottom: 0.4em; }
    .article-body .content img {
        border-radius: var(--radius-md);
        margin: 1.6em 0;
        box-shadow: var(--shadow-sm);
    }
    .article-body .content blockquote {
        border-left: 4px solid var(--color-accent);
        padding: 12px 20px;
        margin: 1.4em 0;
        background: var(--color-accent-light);
        border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        color: var(--color-text-weak);
        font-style: italic;
    }
    .article-body .content a { color: var(--color-accent); text-decoration: underline; }
    .article-body .content code {
        background: var(--color-border-light);
        padding: 2px 8px;
        border-radius: 4px;
        font-size: 0.9em;
    }
    .article-body .content pre {
        background: var(--color-primary);
        color: #e2e8f0;
        padding: 20px 24px;
        border-radius: var(--radius-md);
        overflow-x: auto;
        margin: 1.4em 0;
        font-size: 0.9rem;
        line-height: 1.6;
    }
    .article-footer-meta {
        margin-top: 40px;
        padding-top: 24px;
        border-top: 1px solid var(--color-border);
        display: flex;
        flex-wrap: wrap;
        gap: 12px 24px;
        align-items: center;
        font-size: 0.85rem;
        color: var(--color-text-weak);
    }
    .article-footer-meta i { margin-right: 4px; }
    .article-footer-meta .tag {
        display: inline-block;
        background: var(--color-accent-light);
        color: var(--color-accent);
        font-weight: 600;
        font-size: 0.75rem;
        padding: 4px 14px;
        border-radius: 50px;
    }
    @media (max-width: 768px) {
        .article-body { padding: 32px 24px; }
        .article-body .content { font-size: 1rem; }
    }
    @media (max-width: 520px) {
        .article-body { padding: 24px 16px; border-radius: var(--radius-md); }
        .article-body .content { font-size: 0.95rem; }
        .article-main { padding: 24px 0 40px; }
    }

    /* ===== 未找到文章 ===== */
    .not-found-box {
        text-align: center;
        padding: 80px 24px;
        background: var(--color-surface);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-md);
        max-width: 600px;
        margin: 0 auto;
    }
    .not-found-box i {
        font-size: 3rem;
        color: var(--color-text-weak);
        margin-bottom: 20px;
        opacity: 0.5;
    }
    .not-found-box h2 {
        font-size: 1.5rem;
        margin-bottom: 12px;
    }
    .not-found-box p {
        color: var(--color-text-weak);
        margin-bottom: 24px;
    }
    .not-found-box .btn-back {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        background: var(--color-accent);
        color: #fff;
        padding: 12px 28px;
        border-radius: 50px;
        font-weight: 600;
        transition: background var(--transition), transform var(--transition);
    }
    .not-found-box .btn-back:hover { background: var(--color-accent-hover); transform: translateY(-2px); color: #fff; }

    /* ===== 相关推荐 ===== */
    .related-section {
        max-width: var(--content-max);
        margin: 48px auto 0;
    }
    .related-section h2 {
        font-size: 1.5rem;
        margin-bottom: 24px;
        display: flex;
        align-items: center;
        gap: 10px;
    }
    .related-section h2 i { color: var(--color-accent); font-size: 1.3rem; }
    .related-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
    .related-card {
        background: var(--color-surface);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-sm);
        overflow: hidden;
        transition: transform var(--transition), box-shadow var(--transition);
    }
    .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
    .related-card img {
        width: 100%;
        height: 160px;
        object-fit: cover;
        border-radius: 0;
    }
    .related-card-body {
        padding: 16px 18px 18px;
    }
    .related-card-body .cat-tag {
        display: inline-block;
        font-size: 0.7rem;
        font-weight: 700;
        color: var(--color-accent);
        background: var(--color-accent-light);
        padding: 2px 12px;
        border-radius: 50px;
        margin-bottom: 8px;
        text-transform: uppercase;
        letter-spacing: 0.03em;
    }
    .related-card-body h3 {
        font-size: 1rem;
        font-weight: 700;
        color: var(--color-primary);
        line-height: 1.4;
        margin-bottom: 6px;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .related-card-body p {
        font-size: 0.82rem;
        color: var(--color-text-weak);
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        margin-bottom: 8px;
    }
    .related-card-body .date {
        font-size: 0.72rem;
        color: var(--color-text-weak);
        opacity: 0.7;
    }
    @media (max-width: 768px) {
        .related-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 520px) {
        .related-grid { grid-template-columns: 1fr; }
        .related-section h2 { font-size: 1.25rem; }
    }

    /* ===== CTA 区块 ===== */
    .cta-section {
        background: var(--color-primary);
        background-image: url('/assets/images/backpic/back-3.png');
        background-size: cover;
        background-position: center;
        background-blend-mode: overlay;
        padding: 72px 0;
        margin-top: 48px;
        text-align: center;
        position: relative;
    }
    .cta-section::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(10,37,64,0.85) 0%, rgba(10,37,64,0.75) 100%);
    }
    .cta-section .container { position: relative; z-index: 2; }
    .cta-section h2 {
        font-size: 2rem;
        color: #fff;
        font-weight: 800;
        margin-bottom: 12px;
    }
    .cta-section p {
        color: rgba(255,255,255,0.75);
        font-size: 1.05rem;
        max-width: 600px;
        margin: 0 auto 28px;
    }
    .cta-section .btn-primary {
        display: inline-flex;
        align-items: center;
        gap: 10px;
        background: var(--color-accent);
        color: #fff;
        font-weight: 700;
        font-size: 1rem;
        padding: 14px 36px;
        border-radius: 50px;
        transition: background var(--transition), transform var(--transition);
        border: none;
        cursor: pointer;
    }
    .cta-section .btn-primary:hover { background: var(--color-accent-hover); transform: translateY(-2px); color: #fff; }
    .cta-section .btn-primary i { transition: transform var(--transition); }
    .cta-section .btn-primary:hover i { transform: translateX(4px); }
    @media (max-width: 768px) {
        .cta-section { padding: 48px 0; }
        .cta-section h2 { font-size: 1.5rem; }
        .cta-section p { font-size: 0.95rem; }
    }
    @media (max-width: 520px) {
        .cta-section { padding: 36px 0; }
        .cta-section h2 { font-size: 1.25rem; }
        .cta-section .btn-primary { padding: 12px 24px; font-size: 0.9rem; }
    }

    /* ===== 页脚 ===== */
    .site-footer {
        background: var(--color-primary);
        color: rgba(255,255,255,0.7);
        padding: 56px 0 24px;
    }
    .site-footer .container { max-width: var(--container-max); }
    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr;
        gap: 40px;
        margin-bottom: 40px;
    }
    .footer-brand .logo { color: #fff !important; margin-bottom: 16px; }
    .footer-brand .logo .logo-icon { background: var(--color-cyan); color: var(--color-primary); box-shadow: 0 2px 12px rgba(6,182,212,0.3); }
    .footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 360px; color: rgba(255,255,255,0.6); }
    .footer-links h4 {
        font-size: 0.95rem;
        font-weight: 700;
        color: #fff;
        margin-bottom: 16px;
    }
    .footer-links a {
        display: block;
        color: rgba(255,255,255,0.6);
        font-size: 0.88rem;
        padding: 5px 0;
        transition: color var(--transition), padding-left var(--transition);
    }
    .footer-links a:hover { color: #fff; padding-left: 4px; }
    .footer-bottom {
        border-top: 1px solid rgba(255,255,255,0.08);
        padding-top: 20px;
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: center;
        font-size: 0.8rem;
        color: rgba(255,255,255,0.4);
    }
    @media (max-width: 768px) {
        .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        .footer-brand { grid-column: 1 / -1; }
        .footer-brand p { max-width: 100%; }
    }
    @media (max-width: 520px) {
        .footer-grid { grid-template-columns: 1fr; gap: 24px; }
        .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
        .site-footer { padding: 40px 0 80px; }
    }

    /* ===== 通用工具 ===== */
    .text-center { text-align: center; }
    .mt-8 { margin-top: 8px; }
    .mt-16 { margin-top: 16px; }
    .mb-16 { margin-bottom: 16px; }
    .gap-8 { gap: 8px; }
    .flex-center { display: flex; align-items: center; justify-content: center; }
    @media (max-width: 520px) {
        .hide-mobile { display: none !important; }
    }
    @media (min-width: 769px) {
        .hide-desktop { display: none !important; }
    }