/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f1b2d;
            --primary-light: #1a2d4a;
            --primary-dark: #0a1220;
            --secondary: #1e40af;
            --secondary-light: #2563eb;
            --accent: #3b82f6;
            --accent-light: #60a5fa;
            --cyan: #06b6d4;
            --cyan-light: #22d3ee;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --bg-dark: #0a1220;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --nav-width: 260px;
            --nav-collapsed: 0px;
            --header-height: 0px;
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            display: flex;
            min-height: 100vh;
        }
        a { color: var(--secondary-light); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--accent); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
        button { cursor: pointer; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; color: var(--primary); font-weight: 700; }
        h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
        h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); margin-bottom: 0.5rem; }
        h3 { font-size: clamp(1.15rem, 1.8vw, 1.4rem); }
        p { margin-bottom: 1rem; color: var(--text-light); }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }
        .container-fluid {
            width: 100%;
            padding: 0 24px;
        }
        section {
            padding: 80px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            position: relative;
            display: inline-block;
        }
        .section-title h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--secondary), var(--cyan));
            border-radius: 4px;
            margin: 12px auto 0;
        }
        .section-title p {
            max-width: 600px;
            margin: 12px auto 0;
            font-size: 1.05rem;
        }
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            background: var(--bg-alt);
            color: var(--text-light);
            border: 1px solid var(--border);
        }
        .badge-primary {
            background: rgba(30, 64, 175, 0.1);
            color: var(--secondary);
            border-color: rgba(30, 64, 175, 0.2);
        }
        .badge-accent {
            background: rgba(59, 130, 246, 0.1);
            color: var(--accent);
            border-color: rgba(59, 130, 246, 0.2);
        }
        .badge-cyan {
            background: rgba(6, 182, 212, 0.1);
            color: var(--cyan);
            border-color: rgba(6, 182, 212, 0.2);
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: 2px solid transparent;
            justify-content: center;
        }
        .btn-primary {
            background: var(--secondary);
            color: #fff;
            border-color: var(--secondary);
        }
        .btn-primary:hover {
            background: var(--secondary-light);
            border-color: var(--secondary-light);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(30, 64, 175, 0.3);
        }
        .btn-outline {
            background: transparent;
            color: var(--text);
            border-color: var(--border);
        }
        .btn-outline:hover {
            border-color: var(--secondary);
            color: var(--secondary);
            transform: translateY(-2px);
        }
        .btn-white {
            background: #fff;
            color: var(--primary);
            border-color: #fff;
        }
        .btn-white:hover {
            background: var(--bg-alt);
            border-color: var(--bg-alt);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(255,255,255,0.2);
        }
        .btn-ghost {
            background: transparent;
            color: var(--text-white);
            border-color: rgba(255,255,255,0.3);
        }
        .btn-ghost:hover {
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 1.05rem;
        }

        /* ===== 左侧导航 ===== */
        .site-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--primary);
            color: var(--text-white);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            padding: 0;
            transition: transform var(--transition);
            overflow-y: auto;
            border-right: 1px solid rgba(255,255,255,0.05);
        }
        .site-nav .nav-brand {
            padding: 28px 24px 20px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .site-nav .nav-brand a {
            font-size: 1.5rem;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.5px;
        }
        .site-nav .nav-brand a:hover {
            color: var(--accent-light);
        }
        .site-nav .nav-brand .brand-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--secondary), var(--cyan));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
        }
        .site-nav .nav-links {
            flex: 1;
            padding: 16px 12px;
        }
        .site-nav .nav-links li {
            margin-bottom: 2px;
        }
        .site-nav .nav-links a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.7);
            font-weight: 500;
            font-size: 0.95rem;
            transition: all var(--transition);
        }
        .site-nav .nav-links a i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            color: rgba(255,255,255,0.4);
            transition: color var(--transition);
        }
        .site-nav .nav-links a:hover {
            background: rgba(255,255,255,0.06);
            color: #fff;
        }
        .site-nav .nav-links a:hover i {
            color: var(--accent-light);
        }
        .site-nav .nav-links a.active {
            background: rgba(59, 130, 246, 0.15);
            color: #fff;
            font-weight: 600;
        }
        .site-nav .nav-links a.active i {
            color: var(--accent);
        }
        .site-nav .nav-footer {
            padding: 20px 24px;
            border-top: 1px solid rgba(255,255,255,0.06);
            font-size: 0.75rem;
            color: rgba(255,255,255,0.35);
            text-align: center;
        }

        /* ===== 移动端导航切换 ===== */
        .nav-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            background: var(--primary);
            color: #fff;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            box-shadow: var(--shadow);
            border: none;
            cursor: pointer;
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--primary-light);
        }
        .nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 999;
            backdrop-filter: blur(4px);
        }

        /* ===== 主内容区 ===== */
        .main-content {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            width: calc(100% - var(--nav-width));
            transition: margin-left var(--transition);
        }

        /* ===== Hero 首屏 ===== */
        .hero {
            position: relative;
            padding: 120px 0 100px;
            background: var(--primary);
            overflow: hidden;
            min-height: 80vh;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.15;
            z-index: 0;
        }
        .hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,27,45,0.92) 0%, rgba(30,64,175,0.6) 100%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .hero-badge {
            display: inline-block;
            padding: 6px 20px;
            border-radius: 50px;
            background: rgba(255,255,255,0.08);
            color: var(--accent-light);
            font-size: 0.85rem;
            font-weight: 500;
            border: 1px solid rgba(255,255,255,0.1);
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }
        .hero h1 {
            color: #fff;
            font-weight: 800;
            letter-spacing: -1px;
            margin-bottom: 20px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero h1 span {
            background: linear-gradient(135deg, var(--accent-light), var(--cyan-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            color: rgba(255,255,255,0.75);
            font-size: 1.15rem;
            max-width: 640px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            justify-content: center;
            margin-top: 60px;
            flex-wrap: wrap;
        }
        .hero-stats .stat-item {
            text-align: center;
            color: #fff;
        }
        .hero-stats .stat-item .stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
        }
        .hero-stats .stat-item .stat-label {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.6);
            margin-top: 4px;
        }

        /* ===== 核心优势 ===== */
        .features {
            background: var(--bg-alt);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .feature-card {
            background: var(--bg-card);
            padding: 36px 30px;
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--border);
        }
        .feature-card .icon-box {
            width: 64px;
            height: 64px;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            margin: 0 auto 20px;
            color: #fff;
        }
        .feature-card .icon-box.blue {
            background: linear-gradient(135deg, var(--secondary), var(--accent));
        }
        .feature-card .icon-box.cyan {
            background: linear-gradient(135deg, #0e7490, var(--cyan));
        }
        .feature-card .icon-box.purple {
            background: linear-gradient(135deg, #6d28d9, #a78bfa);
        }
        .feature-card h3 {
            margin-bottom: 12px;
        }
        .feature-card p {
            font-size: 0.92rem;
            margin-bottom: 0;
        }

        /* ===== 服务分类入口 ===== */
        .services {
            background: var(--bg);
        }
        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .service-card {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            cursor: pointer;
        }
        .service-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .service-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
            border-radius: 0;
        }
        .service-card .card-body {
            padding: 24px 24px 28px;
        }
        .service-card .card-body h3 {
            margin-bottom: 8px;
            font-size: 1.15rem;
        }
        .service-card .card-body p {
            font-size: 0.9rem;
            margin-bottom: 16px;
        }
        .service-card .card-body .card-link {
            font-weight: 600;
            font-size: 0.88rem;
            color: var(--secondary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .service-card .card-body .card-link i {
            font-size: 0.75rem;
            transition: transform var(--transition);
        }
        .service-card:hover .card-body .card-link i {
            transform: translateX(4px);
        }

        /* ===== 数据统计 ===== */
        .stats-section {
            background: var(--primary);
            position: relative;
            overflow: hidden;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.06;
            z-index: 0;
        }
        .stats-section .container {
            position: relative;
            z-index: 1;
        }
        .stats-section .section-title h2 {
            color: #fff;
        }
        .stats-section .section-title h2::after {
            background: linear-gradient(90deg, var(--accent), var(--cyan));
        }
        .stats-section .section-title p {
            color: rgba(255,255,255,0.6);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            text-align: center;
        }
        .stat-card {
            background: rgba(255,255,255,0.04);
            border: 1px solid rgba(255,255,255,0.06);
            border-radius: var(--radius);
            padding: 36px 20px;
            backdrop-filter: blur(8px);
            transition: all var(--transition);
        }
        .stat-card:hover {
            background: rgba(255,255,255,0.08);
            transform: translateY(-4px);
        }
        .stat-card .stat-number {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--accent-light);
            letter-spacing: -1px;
            line-height: 1.2;
        }
        .stat-card .stat-label {
            color: rgba(255,255,255,0.6);
            font-size: 0.95rem;
            margin-top: 8px;
        }

        /* ===== 最新资讯 ===== */
        .news {
            background: var(--bg-alt);
        }
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }
        .news-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }
        .news-card .news-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
        }
        .news-card .news-body {
            padding: 24px 24px 28px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-card .news-body .news-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 12px;
        }
        .news-card .news-body .news-meta .category-tag {
            padding: 2px 10px;
            border-radius: 50px;
            background: rgba(30, 64, 175, 0.08);
            color: var(--secondary);
            font-weight: 500;
            font-size: 0.7rem;
        }
        .news-card .news-body h3 {
            font-size: 1.1rem;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .news-card .news-body p {
            font-size: 0.9rem;
            margin-bottom: 16px;
            flex: 1;
        }
        .news-card .news-body .read-more {
            font-weight: 600;
            font-size: 0.85rem;
            color: var(--secondary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .news-card .news-body .read-more i {
            font-size: 0.7rem;
            transition: transform var(--transition);
        }
        .news-card:hover .news-body .read-more i {
            transform: translateX(4px);
        }

        /* ===== 流程步骤 ===== */
        .process {
            background: var(--bg);
        }
        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .process-steps::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 8%;
            right: 8%;
            height: 2px;
            background: linear-gradient(90deg, var(--secondary), var(--cyan), var(--accent), var(--secondary));
            z-index: 0;
            opacity: 0.3;
        }
        .step-item {
            text-align: center;
            position: relative;
            z-index: 1;
            background: var(--bg);
            padding: 0 12px;
        }
        .step-number {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--secondary), var(--accent));
            color: #fff;
            font-size: 1.3rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 4px 16px rgba(30, 64, 175, 0.25);
        }
        .step-item h4 {
            font-size: 1rem;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 0.85rem;
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq {
            background: var(--bg-alt);
        }
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border);
        }
        .faq-question {
            padding: 20px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text);
            background: none;
            width: 100%;
            text-align: left;
            transition: color var(--transition);
        }
        .faq-question i {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: transform var(--transition);
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }
        .faq-item.active .faq-question {
            color: var(--secondary);
        }
        .faq-answer {
            padding: 0 24px 20px;
            font-size: 0.92rem;
            color: var(--text-light);
            display: none;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta {
            background: var(--primary);
            position: relative;
            overflow: hidden;
            padding: 100px 0;
        }
        .cta::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,27,45,0.88) 0%, rgba(30,64,175,0.5) 100%);
            z-index: 1;
        }
        .cta .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta h2 {
            color: #fff;
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            max-width: 700px;
            margin: 0 auto 16px;
        }
        .cta p {
            color: rgba(255,255,255,0.7);
            max-width: 560px;
            margin: 0 auto 32px;
            font-size: 1.05rem;
        }
        .cta .btn-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.6);
            padding: 48px 0 32px;
            border-top: 1px solid rgba(255,255,255,0.04);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer-brand h3 {
            color: #fff;
            font-size: 1.3rem;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 0.88rem;
            color: rgba(255,255,255,0.45);
            max-width: 320px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            color: rgba(255,255,255,0.5);
            font-size: 0.88rem;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--accent-light);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.04);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.35);
        }
        .footer-bottom a {
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a:hover {
            color: var(--accent-light);
        }
        .footer-social {
            display: flex;
            gap: 14px;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255,255,255,0.04);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255,255,255,0.4);
            font-size: 0.9rem;
            transition: all var(--transition);
        }
        .footer-social a:hover {
            background: var(--secondary);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== 空状态 ===== */
        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            font-size: 0.95rem;
        }
        .empty-state i {
            font-size: 2.4rem;
            display: block;
            margin-bottom: 16px;
            color: var(--border);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .services-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-steps::before {
                display: none;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .site-nav {
                transform: translateX(-100%);
            }
            .site-nav.open {
                transform: translateX(0);
            }
            .nav-toggle {
                display: flex;
            }
            .nav-overlay.open {
                display: block;
            }
            .main-content {
                margin-left: 0;
                width: 100%;
            }
            body.nav-open {
                overflow: hidden;
            }
            .hero {
                padding: 100px 0 70px;
                min-height: 60vh;
            }
            .hero h1 {
                font-size: clamp(1.6rem, 6vw, 2.2rem);
            }
            .hero p {
                font-size: 1rem;
            }
            .hero-stats {
                gap: 24px;
                margin-top: 40px;
            }
            .hero-stats .stat-item .stat-number {
                font-size: 1.6rem;
            }
            .features-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .services-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .news-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-card .stat-number {
                font-size: 1.8rem;
            }
            .process-steps {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .step-item {
                padding: 0;
            }
            section {
                padding: 56px 0;
            }
            .section-title {
                margin-bottom: 32px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta {
                padding: 60px 0;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero {
                padding: 80px 0 50px;
                min-height: 50vh;
            }
            .hero-stats {
                flex-direction: column;
                gap: 16px;
                align-items: center;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .hero-actions .btn {
                width: 100%;
                max-width: 280px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-card {
                padding: 24px 12px;
            }
            .process-steps {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .news-card .news-img {
                height: 160px;
            }
            .service-card .card-img {
                height: 160px;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 0.95rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== focus 可访问性 ===== */
        a:focus-visible, button:focus-visible, input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* ===== 分隔线 ===== */
        .divider {
            width: 100%;
            height: 1px;
            background: var(--border);
            margin: 0;
        }

        /* ===== 图片遮罩辅助 ===== */
        .img-mask {
            position: relative;
            overflow: hidden;
        }
        .img-mask::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15,27,45,0.3), transparent);
            pointer-events: none;
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a2a6c;
            --primary-light: #2d4a8e;
            --primary-dark: #0f1b4a;
            --accent: #00b4d8;
            --accent-light: #48cae4;
            --accent-dark: #0096c7;
            --gradient-main: linear-gradient(135deg, #1a2a6c 0%, #2d4a8e 50%, #00b4d8 100%);
            --gradient-accent: linear-gradient(135deg, #00b4d8 0%, #48cae4 100%);
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-light: #f1f5f9;
            --bg-card: #ffffff;
            --text-primary: #0f172a;
            --text-secondary: #334155;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10), 0 4px 16px rgba(0, 0, 0, 0.05);
            --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --nav-width: 260px;
            --header-h: 0px;
            --spacing-section: 100px;
            --spacing-block: 60px;
            --max-width: 1200px;
        }

        /* ===== 基础 Reset ===== */
        *,
        *::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-body);
            display: flex;
            min-height: 100vh;
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            transition: var(--transition);
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 左侧导航 ===== */
        .site-nav {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: var(--nav-width);
            background: var(--bg-white);
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            padding: 28px 20px 20px;
            transition: var(--transition);
            overflow-y: auto;
        }
        .nav-brand {
            margin-bottom: 40px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border);
        }
        .nav-brand a {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.3px;
        }
        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: var(--gradient-main);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 800;
            letter-spacing: 0;
        }
        .nav-links {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .nav-links li a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .nav-links li a i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: var(--text-muted);
            transition: var(--transition);
        }
        .nav-links li a:hover {
            background: var(--bg-light);
            color: var(--primary);
        }
        .nav-links li a:hover i {
            color: var(--accent);
        }
        .nav-links li a.active {
            background: var(--gradient-main);
            color: var(--text-white);
            box-shadow: var(--shadow-md);
        }
        .nav-links li a.active i {
            color: var(--text-white);
        }
        .nav-links li a.active::after {
            display: none;
        }
        .nav-footer {
            margin-top: 20px;
            padding-top: 16px;
            border-top: 1px solid var(--border);
            font-size: 12px;
            color: var(--text-light);
            text-align: center;
            line-height: 1.6;
        }

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

        /* ===== Hero / Banner ===== */
        .hero {
            position: relative;
            min-height: 420px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 80px 24px 60px;
            background: var(--gradient-main);
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.20;
            mix-blend-mode: overlay;
        }
        .hero-bg-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(0, 180, 216, 0.25) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 50%, rgba(26, 42, 108, 0.35) 0%, transparent 60%);
            pointer-events: none;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }
        .hero-badge {
            display: inline-block;
            padding: 6px 20px;
            border-radius: 30px;
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(6px);
            color: var(--text-white);
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 20px;
            border: 1px solid rgba(255, 255, 255, 0.20);
        }
        .hero h1 {
            font-size: 48px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: -1px;
            line-height: 1.2;
        }
        .hero h1 span {
            background: var(--gradient-accent);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 600px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            border: 2px solid transparent;
        }
        .btn-primary {
            background: var(--gradient-accent);
            color: var(--text-white);
            box-shadow: 0 4px 20px rgba(0, 180, 216, 0.35);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 30px rgba(0, 180, 216, 0.45);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border-color: rgba(255, 255, 255, 0.40);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: rgba(255, 255, 255, 0.70);
            transform: translateY(-3px);
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            justify-content: center;
            margin-top: 40px;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            flex-wrap: wrap;
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat .num {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: -0.5px;
        }
        .hero-stat .label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.70);
            margin-top: 4px;
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: var(--spacing-section) 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-header h2 {
            font-size: 36px;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
        }
        .section-header h2 span {
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-header p {
            font-size: 18px;
            color: var(--text-muted);
            max-width: 580px;
            margin: 0 auto;
        }
        .section-subtitle {
            display: inline-block;
            padding: 4px 16px;
            border-radius: 30px;
            background: var(--bg-light);
            color: var(--primary-light);
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 12px;
            letter-spacing: 0.3px;
        }

        /* ===== 优势板块 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            border: 1px solid var(--border);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--accent-light);
        }
        .feature-card .icon {
            width: 60px;
            height: 60px;
            margin: 0 auto 20px;
            border-radius: 16px;
            background: var(--gradient-main);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            color: #fff;
        }
        .feature-card h3 {
            font-size: 18px;
            margin-bottom: 8px;
        }
        .feature-card p {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 0;
        }

        /* ===== 域名价格表 ===== */
        .pricing-section {
            background: var(--bg-light);
        }
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .pricing-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            border: 1px solid var(--border);
            text-align: center;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            position: relative;
        }
        .pricing-card.featured {
            border-color: var(--accent);
            box-shadow: var(--shadow-lg);
            transform: scale(1.02);
        }
        .pricing-card.featured::before {
            content: '热门推荐';
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            padding: 4px 20px;
            border-radius: 30px;
            background: var(--gradient-accent);
            color: #fff;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 0.5px;
        }
        .pricing-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .pricing-card.featured:hover {
            transform: scale(1.02) translateY(-6px);
        }
        .pricing-card .tld {
            font-size: 28px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 4px;
        }
        .pricing-card .tld-sub {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 16px;
        }
        .pricing-card .price {
            font-size: 42px;
            font-weight: 800;
            color: var(--accent-dark);
            margin-bottom: 4px;
        }
        .pricing-card .price span {
            font-size: 18px;
            font-weight: 500;
            color: var(--text-muted);
        }
        .pricing-card .price-note {
            font-size: 13px;
            color: var(--text-light);
            margin-bottom: 20px;
        }
        .pricing-card ul {
            text-align: left;
            margin: 20px 0 28px;
            padding: 0;
        }
        .pricing-card ul li {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 0;
            font-size: 14px;
            color: var(--text-secondary);
            border-bottom: 1px solid var(--border-light);
        }
        .pricing-card ul li:last-child {
            border-bottom: none;
        }
        .pricing-card ul li i {
            color: var(--accent);
            font-size: 14px;
        }
        .pricing-card .btn {
            width: 100%;
            justify-content: center;
        }

        /* ===== 流程板块 ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .process-step {
            text-align: center;
            position: relative;
            padding: 28px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .process-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .process-step .step-num {
            width: 48px;
            height: 48px;
            margin: 0 auto 16px;
            border-radius: 50%;
            background: var(--gradient-main);
            color: #fff;
            font-size: 20px;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .process-step h3 {
            font-size: 17px;
            margin-bottom: 6px;
        }
        .process-step p {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        .process-step::after {
            content: '→';
            position: absolute;
            right: -18px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 24px;
            color: var(--accent);
            font-weight: 300;
        }
        .process-step:last-child::after {
            display: none;
        }

        /* ===== 资讯列表 ===== */
        .news-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .news-item {
            display: flex;
            gap: 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 20px;
            border: 1px solid var(--border);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .news-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .news-item .thumb {
            width: 140px;
            min-height: 100px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--bg-light);
        }
        .news-item .thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .news-item .info {
            flex: 1;
        }
        .news-item .info .tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 30px;
            background: var(--bg-light);
            color: var(--primary-light);
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 6px;
        }
        .news-item .info h3 {
            font-size: 17px;
            margin-bottom: 6px;
            line-height: 1.4;
        }
        .news-item .info h3 a:hover {
            color: var(--accent-dark);
        }
        .news-item .info p {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        .news-item .info .meta {
            display: flex;
            gap: 16px;
            margin-top: 8px;
            font-size: 12px;
            color: var(--text-light);
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg-light);
        }
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-md);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            gap: 16px;
            background: none;
            width: 100%;
            text-align: left;
        }
        .faq-question i {
            color: var(--accent);
            font-size: 18px;
            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 0.4s ease;
            padding: 0 24px;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-answer p {
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--gradient-main);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 36px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.80);
            max-width: 560px;
            margin: 0 auto 32px;
        }
        .cta-section .btn-primary {
            background: var(--text-white);
            color: var(--primary);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }
        .cta-section .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.20);
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.80);
            padding: 60px 0 30px;
        }
        .footer .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand h3 {
            font-size: 22px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            max-width: 320px;
            line-height: 1.7;
            margin-bottom: 0;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--accent-light);
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.10);
            font-size: 13px;
            color: rgba(255, 255, 255, 0.50);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.65);
        }
        .footer-bottom a:hover {
            color: var(--accent-light);
        }
        .footer-social {
            display: flex;
            gap: 16px;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.65);
            font-size: 16px;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== 移动端导航切换 ===== */
        .nav-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: var(--bg-white);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-md);
            cursor: pointer;
            font-size: 20px;
            color: var(--primary);
            align-items: center;
            justify-content: center;
        }
        .nav-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.40);
            z-index: 999;
            backdrop-filter: blur(4px);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .pricing-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-step:nth-child(2)::after {
                display: none;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero h1 {
                font-size: 38px;
            }
            .section-header h2 {
                font-size: 30px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --nav-width: 0px;
                --spacing-section: 60px;
            }
            .nav-toggle {
                display: flex;
            }
            .site-nav {
                transform: translateX(-100%);
                width: 280px;
                box-shadow: var(--shadow-xl);
            }
            .site-nav.open {
                transform: translateX(0);
            }
            .nav-overlay.show {
                display: block;
            }
            .main-content {
                margin-left: 0;
            }
            .hero {
                min-height: 340px;
                padding: 60px 20px 40px;
            }
            .hero h1 {
                font-size: 30px;
            }
            .hero p {
                font-size: 16px;
            }
            .hero-stats {
                gap: 20px;
            }
            .hero-stat .num {
                font-size: 26px;
            }
            .features-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .feature-card {
                padding: 24px 16px;
            }
            .pricing-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .pricing-card.featured {
                transform: none;
            }
            .pricing-card.featured:hover {
                transform: translateY(-6px);
            }
            .process-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .process-step::after {
                display: none;
            }
            .news-list {
                grid-template-columns: 1fr;
            }
            .news-item {
                flex-direction: column;
            }
            .news-item .thumb {
                width: 100%;
                height: 180px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .section-header h2 {
                font-size: 26px;
            }
            .cta-section h2 {
                font-size: 28px;
            }
            .cta-section {
                padding: 60px 0;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }
        }

        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
            .process-grid {
                grid-template-columns: 1fr;
            }
            .hero h1 {
                font-size: 26px;
            }
            .hero-stat .num {
                font-size: 22px;
            }
            .section {
                padding: 40px 0;
            }
            .pricing-card {
                padding: 28px 20px;
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 15px;
            }
            .faq-answer {
                padding: 0 16px;
            }
            .faq-item.open .faq-answer {
                padding: 0 16px 16px;
            }
        }

        /* ===== 辅助类 ===== */
        .text-gradient {
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .mt-1 {
            margin-top: 8px;
        }
        .mt-2 {
            margin-top: 16px;
        }
        .mt-3 {
            margin-top: 24px;
        }
        .mb-1 {
            margin-bottom: 8px;
        }
        .mb-2 {
            margin-bottom: 16px;
        }
        .mb-3 {
            margin-bottom: 24px;
        }
        .text-center {
            text-align: center;
        }
        .gap-2 {
            gap: 8px;
        }
        .gap-3 {
            gap: 16px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
:root {
    --primary: #0f172a;
    --primary-light: #1e293b;
    --primary-dark: #070b14;
    --accent: #2563eb;
    --accent-light: #3b82f6;
    --accent-dark: #1d4ed8;
    --gold: #f59e0b;
    --gold-light: #fbbf24;
    --bg: #f1f5f9;
    --bg-white: #ffffff;
    --bg-card: #ffffff;
    --text: #0f172a;
    --text-body: #1e293b;
    --text-light: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow: 0 4px 20px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.1);
    --shadow-hover: 0 12px 40px rgba(0,0,0,0.13);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
    --nav-width: 260px;
    --header-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);
    font-size: 16px;
    line-height: 1.75;
    color: var(--text-body);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-dark); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}
.section { padding: 72px 0; }
.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}
.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-light);
    max-width: 600px;
    margin-bottom: 40px;
    line-height: 1.6;
}
.text-center { text-align: center; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* ===== 左侧导航 ===== */
.site-wrapper {
    display: flex;
    min-height: 100vh;
}
.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--nav-width);
    height: 100vh;
    background: var(--primary);
    color: #fff;
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: var(--transition);
    overflow-y: auto;
}
.nav-brand {
    padding: 28px 24px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav-brand a {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #fff;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}
.nav-brand a:hover { color: var(--gold-light); }
.brand-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent), var(--gold));
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 800;
    color: #fff;
    flex-shrink: 0;
}
.nav-links {
    flex: 1;
    padding: 20px 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.nav-links li a {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: rgba(255,255,255,0.7);
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
}
.nav-links li a i { width: 20px; text-align: center; font-size: 1rem; }
.nav-links li a:hover {
    background: rgba(255,255,255,0.08);
    color: #fff;
}
.nav-links li a.active {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 15px rgba(37,99,235,0.35);
}
.nav-footer {
    padding: 20px 24px;
    border-top: 1px solid rgba(255,255,255,0.06);
    font-size: 0.78rem;
    color: rgba(255,255,255,0.4);
    line-height: 1.6;
}

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

/* ===== 文章 Banner ===== */
.article-banner {
    position: relative;
    padding: 80px 0 60px;
    background: var(--primary);
    color: #fff;
    overflow: hidden;
}
.article-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
    opacity: 0.15;
    z-index: 0;
}
.article-banner::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(15,23,42,0.92) 0%, rgba(30,41,59,0.7) 100%);
    z-index: 1;
}
.article-banner .container { position: relative; z-index: 2; }
.article-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    color: rgba(255,255,255,0.6);
    margin-bottom: 24px;
}
.article-breadcrumb a { color: rgba(255,255,255,0.7); }
.article-breadcrumb a:hover { color: var(--gold-light); }
.article-breadcrumb .sep { color: rgba(255,255,255,0.3); }
.article-badge {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.3px;
}
.article-title {
    font-size: 2.4rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
    max-width: 900px;
}
.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
}
.article-meta span { display: flex; align-items: center; gap: 6px; }
.article-meta i { color: var(--gold); }

/* ===== 文章正文 ===== */
.article-body-wrap {
    padding: 48px 0 56px;
    background: var(--bg-white);
}
.article-body {
    max-width: 820px;
    margin: 0 auto;
}
.article-body .article-content {
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--text-body);
}
.article-body .article-content h2 { font-size: 1.6rem; font-weight: 700; margin: 40px 0 16px; color: var(--text); }
.article-body .article-content h3 { font-size: 1.25rem; font-weight: 600; margin: 32px 0 12px; color: var(--text); }
.article-body .article-content p { margin-bottom: 20px; }
.article-body .article-content ul, .article-body .article-content ol { margin-bottom: 20px; padding-left: 24px; }
.article-body .article-content ul { list-style: disc; }
.article-body .article-content ol { list-style: decimal; }
.article-body .article-content li { margin-bottom: 8px; }
.article-body .article-content blockquote {
    border-left: 4px solid var(--accent);
    padding: 16px 24px;
    margin: 24px 0;
    background: var(--bg);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-light);
    font-style: italic;
}
.article-body .article-content code {
    background: var(--bg);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--accent-dark);
}
.article-body .article-content a { color: var(--accent); text-decoration: underline; }
.article-body .article-content a:hover { color: var(--accent-dark); }
.article-body .article-content img { border-radius: var(--radius-md); margin: 24px 0; box-shadow: var(--shadow); }

/* ===== 文章信息栏 ===== */
.article-info-bar {
    padding: 24px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    margin-top: 40px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.tag {
    display: inline-block;
    padding: 4px 14px;
    background: var(--bg);
    border-radius: 20px;
    font-size: 0.82rem;
    color: var(--text-light);
    font-weight: 500;
    transition: var(--transition);
    border: 1px solid var(--border);
}
.tag:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.article-share {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-light);
}
.article-share a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg);
    color: var(--text-light);
    border: 1px solid var(--border);
    transition: var(--transition);
}
.article-share a:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ===== 相关推荐 ===== */
.related-section {
    padding: 64px 0;
    background: var(--bg);
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 8px;
}
.related-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border);
}
.related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.related-card-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    background: var(--border-light);
}
.related-card-body { padding: 20px; }
.related-card-body h4 { font-size: 1rem; font-weight: 600; color: var(--text); margin-bottom: 8px; line-height: 1.4; }
.related-card-body h4 a { color: var(--text); }
.related-card-body h4 a:hover { color: var(--accent); }
.related-card-body .meta {
    font-size: 0.82rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 12px;
}

/* ===== CTA 区域 ===== */
.article-cta {
    padding: 64px 0;
    background: var(--primary);
    color: #fff;
    text-align: center;
}
.article-cta h2 { font-size: 1.8rem; font-weight: 700; margin-bottom: 12px; }
.article-cta p { color: rgba(255,255,255,0.7); max-width: 600px; margin: 0 auto 28px; font-size: 1.05rem; }
.article-cta .btn-group { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-decoration: none;
}
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 25px rgba(37,99,235,0.3); }
.btn-outline { background: transparent; color: #fff; border-color: rgba(255,255,255,0.3); }
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: #fff; color: #fff; transform: translateY(-2px); }
.btn-gold { background: var(--gold); color: var(--primary); border-color: var(--gold); }
.btn-gold:hover { background: var(--gold-light); border-color: var(--gold-light); color: var(--primary); transform: translateY(-2px); box-shadow: 0 8px 25px rgba(245,158,11,0.3); }

/* ===== 文章导航（上下篇） ===== */
.article-nav {
    padding: 32px 0;
    background: var(--bg-white);
    border-top: 1px solid var(--border);
}
.article-nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}
.article-nav a {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-light);
    font-weight: 500;
    font-size: 0.95rem;
}
.article-nav a:hover { color: var(--accent); }
.article-nav .back-link { color: var(--accent); font-weight: 600; }
.article-nav .back-link:hover { color: var(--accent-dark); }

/* ===== 内容未找到 ===== */
.not-found-wrap {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 80px 24px;
    text-align: center;
}
.not-found-card {
    background: var(--bg-white);
    padding: 56px 48px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    max-width: 520px;
    width: 100%;
}
.not-found-card .icon {
    font-size: 3.5rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}
.not-found-card h2 { font-size: 1.6rem; color: var(--text); margin-bottom: 12px; }
.not-found-card p { color: var(--text-light); margin-bottom: 24px; }

/* ===== 页脚 ===== */
.footer {
    background: var(--primary-dark);
    color: rgba(255,255,255,0.8);
    padding: 60px 0 0;
    margin-top: auto;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.footer-brand h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}
.footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.55); line-height: 1.7; max-width: 360px; }
.footer-col h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 16px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: rgba(255,255,255,0.55); font-size: 0.88rem; }
.footer-col ul li a:hover { color: var(--gold-light); }
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.82rem;
    color: rgba(255,255,255,0.4);
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--gold-light); }
.footer-social { display: flex; gap: 12px; }
.footer-social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255,255,255,0.06);
    color: rgba(255,255,255,0.5);
    font-size: 1rem;
    transition: var(--transition);
}
.footer-social a:hover { background: var(--accent); color: #fff; }

/* ===== 移动端导航切换 ===== */
.nav-toggle {
    display: none;
    position: fixed;
    top: 12px;
    left: 16px;
    z-index: 1100;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius-sm);
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    cursor: pointer;
    box-shadow: var(--shadow);
    border: none;
    transition: var(--transition);
}
.nav-toggle:hover { background: var(--primary-light); }
.nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
    backdrop-filter: blur(4px);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .related-grid { grid-template-columns: repeat(2, 1fr); }
    .article-title { font-size: 2rem; }
}
@media (max-width: 768px) {
    .nav-toggle { display: flex; }
    .nav-overlay.active { display: block; }
    .site-nav {
        transform: translateX(-100%);
    }
    .site-nav.open { transform: translateX(0); }
    .main-content { margin-left: 0; }
    .article-banner { padding: 60px 0 40px; }
    .article-title { font-size: 1.6rem; }
    .article-body-wrap { padding: 32px 0; }
    .article-body .article-content { font-size: 1rem; }
    .section { padding: 48px 0; }
    .section-title { font-size: 1.5rem; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .related-grid { grid-template-columns: 1fr; }
    .article-info-bar { flex-direction: column; align-items: flex-start; }
    .article-cta h2 { font-size: 1.4rem; }
    .article-nav-inner { flex-direction: column; align-items: flex-start; }
    .not-found-card { padding: 40px 24px; }
}
@media (max-width: 520px) {
    .container { padding: 0 16px; }
    .article-title { font-size: 1.3rem; }
    .article-meta { gap: 12px; font-size: 0.82rem; }
    .btn { padding: 10px 20px; font-size: 0.88rem; }
    .article-banner { padding: 48px 0 32px; }
    .related-card-img { height: 150px; }
    .article-cta .btn-group { flex-direction: column; align-items: center; }
}

/* ===== 动画 ===== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeIn 0.6s ease forwards; }