/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8c;
            --primary-dark: #0f2440;
            --accent: #d4a843;
            --accent-light: #e8c56a;
            --accent-dark: #b88d2e;
            --bg-body: #f5f7fa;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f2440;
            --bg-section-alt: #eef1f5;
            --text-primary: #1a1a2e;
            --text-secondary: #4a5568;
            --text-muted: #8896ab;
            --text-white: #ffffff;
            --border-light: #e2e6ed;
            --border-medium: #c8ced8;
            --shadow-sm: 0 2px 8px rgba(26, 58, 92, 0.06);
            --shadow-md: 0 8px 30px rgba(26, 58, 92, 0.10);
            --shadow-lg: 0 20px 60px rgba(26, 58, 92, 0.14);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --container-max: 1200px;
            --nav-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-light);
        }
        button,
        input,
        textarea,
        select {
            font: inherit;
            color: inherit;
            border: none;
            outline: none;
            background: none;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }
        h1 {
            font-size: 2.8rem;
        }
        h2 {
            font-size: 2.2rem;
        }
        h3 {
            font-size: 1.5rem;
        }
        h4 {
            font-size: 1.2rem;
        }
        p {
            margin-bottom: 1rem;
        }
        p:last-child {
            margin-bottom: 0;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-sm {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-full {
            width: 100%;
            padding: 0 24px;
        }

        /* ===== 辅助类 ===== */
        .section-padding {
            padding: 80px 0;
        }
        .section-padding-sm {
            padding: 48px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            margin-bottom: 12px;
            position: relative;
            display: inline-block;
        }
        .section-title h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin: 12px auto 0;
        }
        .section-title p {
            color: var(--text-secondary);
            font-size: 1.1rem;
            max-width: 680px;
            margin: 0 auto;
        }
        .text-center {
            text-align: center;
        }
        .text-accent {
            color: var(--accent);
        }
        .text-muted {
            color: var(--text-muted);
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .gap-1 {
            gap: 8px;
        }
        .gap-2 {
            gap: 16px;
        }
        .gap-3 {
            gap: 24px;
        }
        .gap-4 {
            gap: 32px;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 32px;
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.4;
            border-radius: var(--radius-sm);
            transition: var(--transition);
            cursor: pointer;
            border: 2px solid transparent;
            text-align: center;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary-dark);
            border-color: var(--accent);
        }
        .btn-primary:hover {
            background: var(--accent-light);
            border-color: var(--accent-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(212, 168, 67, 0.35);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 4px 12px rgba(212, 168, 67, 0.25);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border-color: rgba(255, 255, 255, 0.5);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: var(--text-white);
            color: var(--text-white);
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .btn-light {
            background: var(--text-white);
            color: var(--primary);
            border-color: var(--text-white);
        }
        .btn-light:hover {
            background: var(--bg-section-alt);
            border-color: var(--bg-section-alt);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.10);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 0.9rem;
        }
        .btn-lg {
            padding: 16px 40px;
            font-size: 1.1rem;
        }
        .btn:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 3px;
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(15, 36, 64, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            height: var(--nav-height);
            transition: var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: 0.5px;
        }
        .site-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: var(--accent);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--primary-dark);
            font-weight: 900;
        }
        .site-logo:hover {
            color: var(--accent);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .main-nav a {
            padding: 8px 18px;
            font-size: 0.95rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.75);
            border-radius: var(--radius-sm);
            transition: var(--transition);
            position: relative;
        }
        .main-nav a:hover {
            color: var(--text-white);
            background: rgba(255, 255, 255, 0.06);
        }
        .main-nav a.active {
            color: var(--accent);
            background: rgba(212, 168, 67, 0.12);
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent);
            border-radius: 4px;
        }
        .nav-cta {
            margin-left: 12px;
        }
        .nav-cta .btn {
            padding: 8px 22px;
            font-size: 0.9rem;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            cursor: pointer;
            background: none;
            border: none;
        }
        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-white);
            border-radius: 4px;
            transition: var(--transition);
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding: 120px 0 80px;
            background: var(--primary-dark);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            z-index: 0;
        }
        .hero-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 36, 64, 0.85) 0%, rgba(26, 58, 92, 0.65) 100%);
        }
        .hero .container {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .hero-content {
            color: var(--text-white);
        }
        .hero-content .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            background: rgba(212, 168, 67, 0.18);
            border: 1px solid rgba(212, 168, 67, 0.3);
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--accent);
            margin-bottom: 20px;
        }
        .hero-content .badge i {
            font-size: 0.75rem;
        }
        .hero-content h1 {
            font-size: 3.2rem;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero-content h1 span {
            color: var(--accent);
        }
        .hero-content .hero-sub {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.8);
            line-height: 1.7;
            max-width: 540px;
            margin-bottom: 32px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 40px;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }
        .hero-stats .stat-item {
            text-align: center;
        }
        .hero-stats .stat-num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent);
        }
        .hero-stats .stat-label {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            margin-top: 4px;
        }
        .hero-visual {
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }
        .hero-visual .hero-card {
            background: rgba(255, 255, 255, 0.06);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            width: 100%;
            max-width: 460px;
            color: var(--text-white);
        }
        .hero-visual .hero-card .card-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
        }
        .hero-visual .hero-card .card-header .tag {
            padding: 4px 12px;
            background: var(--accent);
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--primary-dark);
        }
        .hero-visual .hero-card .data-row {
            display: flex;
            justify-content: space-between;
            padding: 12px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.95rem;
        }
        .hero-visual .hero-card .data-row:last-child {
            border-bottom: none;
        }
        .hero-visual .hero-card .data-row .label {
            color: rgba(255, 255, 255, 0.6);
        }
        .hero-visual .hero-card .data-row .value {
            font-weight: 600;
            color: var(--accent);
        }
        .hero-visual .hero-card .trend {
            color: #4ade80;
            font-weight: 600;
        }
        .hero-visual .hero-card .trend.down {
            color: #f87171;
        }

        /* ===== 板块 ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-section-alt);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-dark .section-title h2 {
            color: var(--text-white);
        }
        .section-dark .section-title p {
            color: rgba(255, 255, 255, 0.7);
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .card-body {
            padding: 24px;
        }
        .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: var(--radius-md) var(--radius-md) 0 0;
        }
        .card-title {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .card-text {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.6;
        }
        .card-footer {
            padding: 16px 24px;
            border-top: 1px solid var(--border-light);
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* ===== 服务优势网格 ===== */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }

        .service-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            text-align: center;
        }
        .service-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-6px);
        }
        .service-card .icon-box {
            width: 64px;
            height: 64px;
            margin: 0 auto 20px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--accent);
        }
        .service-card h3 {
            font-size: 1.2rem;
            margin-bottom: 10px;
        }
        .service-card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
        }

        /* ===== 分类入口卡片 ===== */
        .category-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .category-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .category-card .cat-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        .category-card .cat-body {
            padding: 20px 24px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .category-card .cat-body h3 {
            font-size: 1.2rem;
            margin-bottom: 8px;
        }
        .category-card .cat-body p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            flex: 1;
            margin-bottom: 16px;
        }
        .category-card .cat-body .btn {
            align-self: flex-start;
        }

        /* ===== 资讯列表 (CMS) ===== */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .news-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            background: var(--bg-card);
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .news-item:hover {
            box-shadow: var(--shadow-sm);
            border-color: var(--border-medium);
        }
        .news-item .news-meta {
            display: flex;
            gap: 16px;
            align-items: center;
            flex-shrink: 0;
            min-width: 120px;
        }
        .news-item .news-meta .cat-tag {
            padding: 2px 12px;
            background: var(--primary);
            color: var(--text-white);
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 500;
        }
        .news-item .news-meta .date {
            font-size: 0.85rem;
            color: var(--text-muted);
            white-space: nowrap;
        }
        .news-item .news-title {
            flex: 1;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            line-height: 1.5;
        }
        .news-item .news-title:hover {
            color: var(--primary-light);
        }
        .news-item .news-title a {
            color: inherit;
        }
        .news-item .news-title a:hover {
            color: var(--primary-light);
        }

        .news-empty {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            font-size: 1rem;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px dashed var(--border-medium);
        }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-block {
            text-align: center;
            padding: 32px 16px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.06);
            transition: var(--transition);
        }
        .stat-block:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        .stat-block .num {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.1;
        }
        .stat-block .num .suffix {
            font-size: 1.2rem;
        }
        .stat-block .label {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.95rem;
            margin-top: 8px;
        }

        /* ===== 评价/信任 ===== */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .testimonial-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
        }
        .testimonial-card .stars {
            color: var(--accent);
            font-size: 0.9rem;
            margin-bottom: 12px;
            letter-spacing: 2px;
        }
        .testimonial-card .quote {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
            font-style: italic;
            margin-bottom: 16px;
        }
        .testimonial-card .author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .testimonial-card .author .avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-white);
            font-weight: 700;
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .testimonial-card .author .name {
            font-weight: 600;
            font-size: 0.95rem;
        }
        .testimonial-card .author .role {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-medium);
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1.05rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            color: var(--text-primary);
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--primary-light);
        }
        .faq-question .icon {
            font-size: 1.2rem;
            color: var(--accent);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-question .icon {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 400px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            padding: 80px 0;
            text-align: center;
            color: var(--text-white);
        }
        .cta-section h2 {
            color: var(--text-white);
            font-size: 2.4rem;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-section .btn {
            font-size: 1.1rem;
            padding: 16px 44px;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 60px 0 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .site-logo {
            margin-bottom: 12px;
            font-size: 1.3rem;
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h4 {
            color: var(--text-white);
            font-size: 1rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.6);
            font-size: 1rem;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--accent);
            color: var(--primary-dark);
        }

        /* ===== 徽章 / 标签 ===== */
        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 12px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 500;
        }
        .badge-tag.primary {
            background: rgba(26, 58, 92, 0.1);
            color: var(--primary);
        }
        .badge-tag.accent {
            background: rgba(212, 168, 67, 0.15);
            color: var(--accent-dark);
        }
        .badge-tag.green {
            background: rgba(74, 222, 128, 0.12);
            color: #16a34a;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .hero-content h1 {
                font-size: 2.4rem;
            }
            .hero .container {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .hero-visual .hero-card {
                max-width: 100%;
            }
            .hero-stats {
                gap: 24px;
                flex-wrap: wrap;
            }
            .grid-3,
            .testimonial-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .section-padding {
                padding: 60px 0;
            }
            .section {
                padding: 60px 0;
            }
        }
        @media (max-width: 768px) {
            :root {
                --nav-height: 62px;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.25rem;
            }
            .main-nav {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: rgba(15, 36, 64, 0.98);
                backdrop-filter: blur(16px);
                -webkit-backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                pointer-events: none;
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
            }
            .main-nav a.active::after {
                display: none;
            }
            .main-nav a.active {
                background: rgba(212, 168, 67, 0.15);
            }
            .nav-cta {
                margin-left: 0;
                margin-top: 8px;
                width: 100%;
            }
            .nav-cta .btn {
                width: 100%;
                justify-content: center;
            }
            .hamburger {
                display: flex;
            }
            .hero {
                min-height: auto;
                padding: 100px 0 60px;
            }
            .hero-content h1 {
                font-size: 2rem;
            }
            .hero-content .hero-sub {
                font-size: 1rem;
            }
            .hero-stats {
                gap: 16px;
                justify-content: center;
            }
            .hero-stats .stat-item {
                flex: 1;
                min-width: 80px;
            }
            .hero-stats .stat-num {
                font-size: 1.4rem;
            }
            .grid-3,
            .grid-4,
            .testimonial-grid,
            .grid-2 {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-block .num {
                font-size: 1.8rem;
            }
            .news-item {
                flex-direction: column;
                gap: 10px;
                padding: 16px 18px;
            }
            .news-item .news-meta {
                min-width: auto;
                flex-wrap: wrap;
                gap: 8px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 1.8rem;
            }
            .section-padding {
                padding: 40px 0;
            }
            .section {
                padding: 40px 0;
            }
            .section-title {
                margin-bottom: 32px;
            }
            .service-card {
                padding: 24px 20px;
            }
            .testimonial-card {
                padding: 20px 18px;
            }
            .faq-question {
                padding: 14px 18px;
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 18px;
            }
            .faq-item.active .faq-answer {
                padding: 0 18px 16px;
            }
            .container {
                padding: 0 16px;
            }
            .container-full {
                padding: 0 16px;
            }
            .hero-visual .hero-card {
                padding: 20px 16px;
            }
            .hero-visual .hero-card .data-row {
                font-size: 0.85rem;
                padding: 10px 0;
            }
        }
        @media (max-width: 480px) {
            .hero-content h1 {
                font-size: 1.6rem;
            }
            .hero-actions {
                flex-direction: column;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .stat-block {
                padding: 20px 12px;
            }
            .stat-block .num {
                font-size: 1.5rem;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 1rem;
            }
            .section-title h2 {
                font-size: 1.3rem;
            }
            .section-title p {
                font-size: 0.95rem;
            }
            .category-card .cat-body {
                padding: 16px 18px 20px;
            }
        }

        /* ===== 焦点可见性 ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 3px;
            border-radius: 4px;
        }

        /* ===== 滚动条美化 ===== */
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-body);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border-medium);
            border-radius: 8px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }

        /* ===== 选择文本 ===== */
        ::selection {
            background: var(--accent);
            color: var(--primary-dark);
        }

        /* ===== 导航品牌活动风格增强 ===== */
        .nav-badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 2px 10px;
            background: rgba(212, 168, 67, 0.2);
            border: 1px solid rgba(212, 168, 67, 0.3);
            border-radius: 50px;
            font-size: 0.7rem;
            font-weight: 600;
            color: var(--accent);
            margin-left: 6px;
            letter-spacing: 0.3px;
        }
        .nav-badge i {
            font-size: 0.6rem;
        }
        .site-header.scrolled {
            background: rgba(15, 36, 64, 0.98);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
        }
        @media (max-width: 768px) {
            .nav-badge {
                margin-left: 0;
            }
        }

        /* ===== 浮动装饰 ===== */
        .hero-float {
            position: absolute;
            border-radius: 50%;
            background: rgba(212, 168, 67, 0.06);
            pointer-events: none;
            z-index: 0;
        }
        .hero-float.f1 {
            width: 300px;
            height: 300px;
            top: -80px;
            right: -60px;
        }
        .hero-float.f2 {
            width: 200px;
            height: 200px;
            bottom: 10%;
            left: -40px;
            background: rgba(255, 255, 255, 0.03);
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a4a8a;
            --primary-light: #2a6ab8;
            --primary-dark: #0f2d5a;
            --secondary: #e8a838;
            --secondary-light: #f0c060;
            --accent: #22a67e;
            --bg-light: #f7f9fc;
            --bg-dark: #0f1a2e;
            --bg-card: #ffffff;
            --text-dark: #1a2332;
            --text-body: #3d4a5c;
            --text-light: #7a8a9e;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f0f2f5;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10);
            --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.12);
            --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --container: 1200px;
            --nav-height: 72px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-light);
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }

        ul,
        ol {
            list-style: none;
        }

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

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            height: var(--nav-height);
            transition: box-shadow var(--transition);
        }

        .site-header.scrolled {
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
        }

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

        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 24px;
            font-weight: 700;
            color: var(--primary-dark);
            text-decoration: none;
            letter-spacing: -0.3px;
        }
        .site-logo:hover {
            color: var(--primary);
        }
        .site-logo .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: var(--primary);
            color: #fff;
            border-radius: 10px;
            font-size: 20px;
            font-weight: 800;
            flex-shrink: 0;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .main-nav a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            text-decoration: none;
            padding: 8px 0;
            position: relative;
            transition: color var(--transition);
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--primary);
            transform: scaleX(0);
            transform-origin: center;
            transition: transform var(--transition);
            border-radius: 2px;
        }
        .main-nav a:hover {
            color: var(--primary);
        }
        .main-nav a:hover::after {
            transform: scaleX(0.6);
        }
        .main-nav a.active {
            color: var(--primary);
            font-weight: 600;
        }
        .main-nav a.active::after {
            transform: scaleX(1);
        }

        .nav-badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 11px;
            font-weight: 600;
            color: var(--secondary);
            background: rgba(232, 168, 56, 0.12);
            padding: 2px 10px;
            border-radius: 20px;
            margin-left: 6px;
            vertical-align: middle;
            letter-spacing: 0.3px;
        }
        .nav-badge i {
            font-size: 10px;
        }

        .nav-cta {
            margin-left: 8px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            font-size: 15px;
            padding: 12px 28px;
            border-radius: 50px;
            cursor: pointer;
            transition: all var(--transition);
            border: none;
            text-decoration: none;
            line-height: 1.2;
        }
        .btn:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 3px;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(26, 74, 138, 0.25);
        }
        .btn-primary:hover {
            background: var(--primary-light);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(26, 74, 138, 0.35);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(26, 74, 138, 0.20);
        }

        .btn-secondary {
            background: var(--secondary);
            color: #1a2332;
            box-shadow: 0 4px 14px rgba(232, 168, 56, 0.25);
        }
        .btn-secondary:hover {
            background: var(--secondary-light);
            color: #1a2332;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(232, 168, 56, 0.35);
        }

        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-sm {
            font-size: 13px;
            padding: 8px 20px;
        }

        .btn-lg {
            font-size: 17px;
            padding: 16px 36px;
        }

        /* ===== Mobile Menu Toggle ===== */
        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            transition: background var(--transition);
        }
        .menu-toggle:hover {
            background: var(--border-light);
        }
        .menu-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-dark);
            border-radius: 4px;
            transition: all var(--transition);
        }
        .menu-toggle.open span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .menu-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .menu-toggle.open span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Article Hero ===== */
        .article-hero {
            padding: 140px 0 60px;
            background: linear-gradient(135deg, var(--bg-dark) 0%, #1a2a44 100%);
            position: relative;
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.10;
            pointer-events: none;
        }
        .article-hero .container {
            position: relative;
            z-index: 1;
        }
        .article-hero h1 {
            font-size: 36px;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.3;
            max-width: 800px;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 24px;
            color: rgba(255, 255, 255, 0.75);
            font-size: 14px;
            margin-top: 8px;
        }
        .article-meta i {
            margin-right: 6px;
            opacity: 0.7;
        }
        .article-meta .category-tag {
            display: inline-flex;
            align-items: center;
            background: var(--secondary);
            color: #1a2332;
            font-weight: 600;
            font-size: 13px;
            padding: 4px 14px;
            border-radius: 20px;
        }
        .article-meta .category-tag i {
            margin-right: 4px;
            opacity: 1;
        }

        /* ===== Article Main Content ===== */
        .article-main {
            padding: 60px 0 80px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 48px;
            font-size: 16.5px;
            line-height: 1.9;
            color: var(--text-body);
        }
        .article-body h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-dark);
            margin: 40px 0 16px;
            letter-spacing: -0.3px;
        }
        .article-body h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-dark);
            margin: 32px 0 12px;
        }
        .article-body p {
            margin-bottom: 20px;
        }
        .article-body ul,
        .article-body ol {
            margin-bottom: 20px;
            padding-left: 24px;
        }
        .article-body li {
            margin-bottom: 8px;
            list-style: disc;
        }
        .article-body ol li {
            list-style: decimal;
        }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--bg-light);
            padding: 16px 24px;
            margin: 24px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-dark);
            font-style: italic;
        }
        .article-body img {
            border-radius: var(--radius-sm);
            margin: 24px auto;
            box-shadow: var(--shadow);
        }
        .article-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-body a:hover {
            color: var(--primary-light);
        }
        .article-body .article-content-empty {
            text-align: center;
            padding: 80px 20px;
            color: var(--text-light);
        }
        .article-body .article-content-empty i {
            font-size: 48px;
            color: var(--border);
            margin-bottom: 16px;
            display: block;
        }
        .article-body .article-content-empty a {
            display: inline-block;
            margin-top: 16px;
        }

        /* ===== Article Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 28px;
        }
        .sidebar-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--border-light);
        }
        .sidebar-list li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border-light);
        }
        .sidebar-list li:last-child {
            border-bottom: none;
        }
        .sidebar-list a {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-body);
            transition: color var(--transition);
        }
        .sidebar-list a:hover {
            color: var(--primary);
        }
        .sidebar-list a i {
            color: var(--primary);
            font-size: 12px;
            margin-top: 4px;
            flex-shrink: 0;
        }
        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: #fff;
            text-align: center;
            padding: 32px 24px;
        }
        .sidebar-cta h3 {
            color: #fff;
            border-bottom: none;
            font-size: 20px;
            margin-bottom: 8px;
        }
        .sidebar-cta p {
            font-size: 14px;
            opacity: 0.85;
            margin-bottom: 20px;
        }
        .sidebar-cta .btn {
            background: var(--secondary);
            color: #1a2332;
        }
        .sidebar-cta .btn:hover {
            background: var(--secondary-light);
            transform: translateY(-2px);
        }

        /* ===== Related Articles ===== */
        .related-section {
            padding: 60px 0;
            background: var(--bg-card);
            border-top: 1px solid var(--border);
        }
        .related-section .section-title {
            font-size: 28px;
            font-weight: 800;
            color: var(--text-dark);
            margin-bottom: 8px;
            letter-spacing: -0.3px;
        }
        .related-section .section-subtitle {
            font-size: 16px;
            color: var(--text-light);
            margin-bottom: 32px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-light);
            border-radius: var(--radius);
            overflow: hidden;
            transition: all var(--transition);
            border: 1px solid var(--border);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: transparent;
        }
        .related-card .card-img {
            height: 180px;
            background: var(--border-light);
            overflow: hidden;
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
        }
        .related-card .card-body {
            padding: 20px 24px 24px;
        }
        .related-card .card-body h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body .card-meta {
            font-size: 13px;
            color: var(--text-light);
            margin-top: 12px;
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .related-card .card-body .card-meta i {
            margin-right: 4px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 60px 0 0;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .site-footer .site-logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .site-footer .site-logo .logo-icon {
            background: var(--secondary);
            color: #1a2332;
        }
        .site-footer .site-logo:hover {
            color: var(--secondary-light);
        }
        .site-footer .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            opacity: 0.7;
            max-width: 340px;
        }
        .site-footer .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .site-footer .footer-col ul li {
            margin-bottom: 10px;
        }
        .site-footer .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            transition: color var(--transition);
            text-decoration: none;
        }
        .site-footer .footer-col ul li a:hover {
            color: var(--secondary-light);
        }
        .site-footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            font-size: 13px;
            opacity: 0.6;
            flex-wrap: wrap;
            gap: 12px;
        }
        .site-footer .footer-social {
            display: flex;
            gap: 16px;
        }
        .site-footer .footer-social a {
            color: rgba(255, 255, 255, 0.5);
            font-size: 18px;
            transition: color var(--transition);
        }
        .site-footer .footer-social a:hover {
            color: var(--secondary-light);
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 16px;
        }
        .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: color var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--secondary-light);
        }
        .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.3);
        }
        .breadcrumb .current {
            color: var(--secondary);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .sidebar-cta {
                grid-column: 1 / -1;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: flex;
            }

            .main-nav {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                flex-direction: column;
                gap: 0;
                padding: 16px 24px 24px;
                box-shadow: 0 12px 40px rgba(0, 0, 0, 0.10);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
                border-radius: 0 0 var(--radius) var(--radius);
                max-height: calc(100vh - var(--nav-height));
                overflow-y: auto;
                pointer-events: none;
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a {
                padding: 14px 0;
                font-size: 16px;
                width: 100%;
                border-bottom: 1px solid var(--border-light);
            }
            .main-nav a::after {
                display: none;
            }
            .main-nav a.active {
                color: var(--primary);
            }
            .main-nav .nav-badge {
                margin-left: 8px;
            }
            .main-nav .nav-cta {
                margin-left: 0;
                margin-top: 12px;
                width: 100%;
            }
            .main-nav .nav-cta .btn {
                width: 100%;
                justify-content: center;
            }

            .article-hero {
                padding: 110px 0 40px;
            }
            .article-hero h1 {
                font-size: 26px;
            }
            .article-meta {
                font-size: 13px;
                gap: 10px 16px;
            }

            .article-body {
                padding: 28px 20px;
                font-size: 15px;
            }
            .article-body h2 {
                font-size: 22px;
            }
            .article-body h3 {
                font-size: 18px;
            }

            .article-sidebar {
                grid-template-columns: 1fr;
            }

            .related-grid {
                grid-template-columns: 1fr;
            }
            .related-section .section-title {
                font-size: 22px;
            }

            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .container {
                padding: 0 16px;
            }
        }

        @media (max-width: 520px) {
            .article-hero h1 {
                font-size: 22px;
            }
            .article-body {
                padding: 20px 16px;
                font-size: 14.5px;
            }
            .article-body h2 {
                font-size: 20px;
            }
            .btn-lg {
                font-size: 15px;
                padding: 14px 28px;
            }
            .related-card .card-img {
                height: 140px;
            }
            .related-card .card-body {
                padding: 16px 18px 20px;
            }
            .site-footer {
                padding: 40px 0 0;
            }
        }

        /* ===== Print ===== */
        @media print {
            .site-header {
                position: relative;
                box-shadow: none;
                border-bottom: 1px solid #ddd;
            }
            .nav-cta,
            .menu-toggle,
            .article-sidebar,
            .related-section,
            .site-footer .footer-social {
                display: none !important;
            }
            .article-hero {
                padding: 40px 0 20px;
                background: #f5f5f5 !important;
            }
            .article-hero h1 {
                color: #000;
            }
            .article-body {
                box-shadow: none;
                padding: 20px 0;
            }
            .article-layout {
                grid-template-columns: 1fr;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
            }
        }

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

        /* ===== Selection ===== */
        ::selection {
            background: var(--primary);
            color: #fff;
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8c;
            --primary-dark: #0f2440;
            --secondary: #e8a838;
            --secondary-light: #f0c060;
            --secondary-dark: #c88a20;
            --accent: #d4553a;
            --accent-light: #e07050;
            --bg-body: #f5f7fa;
            --bg-white: #ffffff;
            --bg-section-alt: #eef1f6;
            --bg-dark: #0f1a2e;
            --text-dark: #1a2a3a;
            --text-body: #3a4a5a;
            --text-light: #6a7a8a;
            --text-white: #f0f4f8;
            --border-color: #dce0e8;
            --border-light: #e8ecf2;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow-md: 0 6px 20px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-height);
        }
        a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
        a:hover, a:focus { color: var(--primary); }
        a:focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; border-radius: 2px; }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        button { cursor: pointer; border: none; background: none; }
        button:focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; }
        ul { list-style: none; }
        h1, h2, h3, h4, h5, h6 { color: var(--text-dark); line-height: 1.3; font-weight: 700; }
        h1 { font-size: 2.8rem; letter-spacing: -0.02em; }
        h2 { font-size: 2.2rem; letter-spacing: -0.01em; }
        h3 { font-size: 1.5rem; }
        h4 { font-size: 1.2rem; }
        p { margin-bottom: 1rem; }
        ::selection { background: var(--secondary); color: var(--text-dark); }

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

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255,255,255,0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            text-decoration: none;
            letter-spacing: -0.02em;
        }
        .site-logo:hover { color: var(--primary); }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 1.2rem;
            font-weight: 800;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }
        .main-nav a {
            position: relative;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-body);
            padding: 6px 0;
            transition: color var(--transition);
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--secondary);
            transition: width var(--transition);
            border-radius: 1px;
        }
        .main-nav a:hover { color: var(--primary); }
        .main-nav a:hover::after { width: 100%; }
        .main-nav a.active {
            color: var(--primary);
            font-weight: 600;
        }
        .main-nav a.active::after { width: 100%; }
        .nav-badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            background: var(--secondary);
            color: var(--text-dark);
            font-size: 0.7rem;
            font-weight: 600;
            padding: 2px 10px;
            border-radius: 20px;
            margin-left: 6px;
            vertical-align: middle;
        }
        .nav-badge i { font-size: 0.6rem; }
        .nav-cta { margin-left: 8px; }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            border: 2px solid transparent;
            text-align: center;
            cursor: pointer;
            line-height: 1.2;
        }
        .btn-sm { padding: 8px 20px; font-size: 0.9rem; }
        .btn-md { padding: 12px 28px; font-size: 1rem; }
        .btn-lg { padding: 16px 40px; font-size: 1.1rem; border-radius: var(--radius-md); }
        .btn-primary {
            background: var(--secondary);
            color: var(--text-dark);
            border-color: var(--secondary);
        }
        .btn-primary:hover, .btn-primary:focus {
            background: var(--secondary-dark);
            border-color: var(--secondary-dark);
            color: var(--text-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(232,168,56,0.35);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover, .btn-outline:focus {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(26,58,92,0.25);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }
        .btn-accent:hover, .btn-accent:focus {
            background: var(--accent-light);
            border-color: var(--accent-light);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(212,85,58,0.35);
        }
        .btn-white {
            background: #fff;
            color: var(--primary);
            border-color: #fff;
        }
        .btn-white:hover, .btn-white:focus {
            background: var(--bg-section-alt);
            border-color: var(--bg-section-alt);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255,255,255,0.3);
        }

        /* Mobile nav toggle */
        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--primary);
            background: none;
            border: none;
            cursor: pointer;
            padding: 4px;
        }
        .nav-toggle:focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; }

        /* ===== Hero ===== */
        .hero-section {
            position: relative;
            min-height: 520px;
            display: flex;
            align-items: center;
            background: var(--primary-dark);
            overflow: hidden;
            padding: 80px 0 60px;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25;
            mix-blend-mode: overlay;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,36,64,0.92) 0%, rgba(26,58,92,0.80) 50%, rgba(15,36,64,0.70) 100%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(232,168,56,0.2);
            color: var(--secondary-light);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 6px 18px;
            border-radius: 30px;
            border: 1px solid rgba(232,168,56,0.3);
            margin-bottom: 24px;
        }
        .hero-badge i { color: var(--secondary); }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }
        .hero-title span {
            color: var(--secondary);
        }
        .hero-desc {
            font-size: 1.2rem;
            color: rgba(255,255,255,0.8);
            max-width: 640px;
            margin: 0 auto 36px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 48px;
            margin-top: 48px;
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.12);
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }
        .hero-stat-number span { color: var(--secondary); }
        .hero-stat-label {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.6);
            margin-top: 4px;
        }

        /* ===== Section Shared ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-section-alt);
        }
        .section-white {
            background: var(--bg-white);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-dark h2,
        .section-dark h3,
        .section-dark h4 { color: #fff; }
        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 56px;
        }
        .section-header h2 {
            margin-bottom: 16px;
        }
        .section-header p {
            font-size: 1.1rem;
            color: var(--text-light);
        }
        .section-dark .section-header p { color: rgba(255,255,255,0.7); }
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--secondary);
            background: rgba(232,168,56,0.12);
            padding: 4px 16px;
            border-radius: 20px;
            margin-bottom: 12px;
        }
        .section-dark .section-label { background: rgba(232,168,56,0.18); }

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

        .card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--border-light);
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: var(--bg-section-alt);
        }
        .card-body {
            padding: 24px;
        }
        .card-body h3 {
            font-size: 1.2rem;
            margin-bottom: 10px;
        }
        .card-body p {
            font-size: 0.95rem;
            color: var(--text-light);
            margin-bottom: 0;
            line-height: 1.6;
        }
        .card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--primary-light);
            background: rgba(26,58,92,0.08);
            padding: 2px 12px;
            border-radius: 20px;
            margin-bottom: 12px;
        }

        /* ===== Feature / Icon Cards ===== */
        .feature-card {
            text-align: center;
            padding: 36px 24px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .feature-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 64px;
            height: 64px;
            border-radius: 16px;
            background: var(--primary);
            color: #fff;
            font-size: 1.6rem;
            margin-bottom: 20px;
            transition: transform var(--transition);
        }
        .feature-card:hover .feature-icon { transform: scale(1.08); }
        .feature-icon.gold { background: var(--secondary); color: var(--text-dark); }
        .feature-icon.teal { background: #1a7a6a; }
        .feature-icon.rose { background: var(--accent); }
        .feature-card h3 { font-size: 1.2rem; margin-bottom: 12px; }
        .feature-card p { font-size: 0.92rem; color: var(--text-light); margin-bottom: 0; }

        /* ===== Steps / Process ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .step-card {
            text-align: center;
            position: relative;
        }
        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 1.3rem;
            font-weight: 800;
            margin-bottom: 16px;
            transition: all var(--transition);
            position: relative;
            z-index: 2;
        }
        .step-card:hover .step-number {
            background: var(--secondary);
            color: var(--text-dark);
            transform: scale(1.1);
            box-shadow: 0 0 0 8px rgba(232,168,56,0.15);
        }
        .step-card h4 { font-size: 1.1rem; margin-bottom: 8px; }
        .step-card p { font-size: 0.9rem; color: var(--text-light); margin-bottom: 0; }
        .step-connector {
            position: absolute;
            top: 26px;
            left: calc(50% + 40px);
            width: calc(100% - 80px);
            height: 2px;
            background: var(--border-color);
            z-index: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover { box-shadow: var(--shadow-sm); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-dark);
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            gap: 16px;
        }
        .faq-question i {
            color: var(--primary-light);
            font-size: 0.9rem;
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 0.95rem;
            color: var(--text-light);
            line-height: 1.7;
            display: none;
        }
        .faq-item.active .faq-answer { display: block; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            padding: 80px 0;
            text-align: center;
        }
        .cta-section h2 {
            color: #fff;
            font-size: 2.4rem;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255,255,255,0.8);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto 36px;
        }
        .cta-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== Testimonial / Quote ===== */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .testimonial-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .testimonial-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .testimonial-stars {
            color: var(--secondary);
            font-size: 0.9rem;
            margin-bottom: 14px;
            letter-spacing: 2px;
        }
        .testimonial-text {
            font-size: 0.95rem;
            color: var(--text-body);
            line-height: 1.7;
            margin-bottom: 16px;
            font-style: italic;
        }
        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .testimonial-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--bg-section-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--primary);
            font-size: 1.1rem;
        }
        .testimonial-name {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-dark);
        }
        .testimonial-role {
            font-size: 0.8rem;
            color: var(--text-light);
        }

        /* ===== Scenario Cards ===== */
        .scenario-card {
            display: flex;
            align-items: center;
            gap: 28px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 36px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .scenario-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .scenario-icon {
            flex-shrink: 0;
            width: 72px;
            height: 72px;
            border-radius: 18px;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
        }
        .scenario-icon.gold { background: var(--secondary); color: var(--text-dark); }
        .scenario-icon.teal { background: #1a7a6a; }
        .scenario-icon.rose { background: var(--accent); }
        .scenario-content h4 { font-size: 1.15rem; margin-bottom: 6px; }
        .scenario-content p { font-size: 0.92rem; color: var(--text-light); margin-bottom: 0; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.75);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .site-logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand .site-logo .logo-icon {
            background: var(--secondary);
            color: var(--text-dark);
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255,255,255,0.6);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 1rem;
            color: #fff;
            margin-bottom: 18px;
            font-weight: 600;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a {
            color: rgba(255,255,255,0.6);
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover { color: var(--secondary); }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0 32px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-social { display: flex; gap: 16px; }
        .footer-social a {
            color: rgba(255,255,255,0.4);
            font-size: 1.2rem;
            transition: color var(--transition);
        }
        .footer-social a:hover { color: var(--secondary); }

        /* ===== Back to top ===== */
        .back-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: var(--shadow-md);
            opacity: 0;
            visibility: hidden;
            transition: all var(--transition);
            z-index: 900;
            border: none;
            cursor: pointer;
        }
        .back-top.visible { opacity: 1; visibility: visible; }
        .back-top:hover {
            background: var(--primary-light);
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.9rem; }
            .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
            .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
            .steps-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
            .step-connector { display: none; }
            .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
            .hero-title { font-size: 2.6rem; }
        }

        @media (max-width: 768px) {
            :root { --header-height: 64px; }
            body { padding-top: var(--header-height); }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            h3 { font-size: 1.2rem; }

            .main-nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 12px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-md);
                transform: translateY(-120%);
                opacity: 0;
                transition: all var(--transition);
                pointer-events: none;
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a { font-size: 1rem; padding: 8px 0; }
            .nav-cta { margin-left: 0; margin-top: 8px; }
            .nav-toggle { display: block; }

            .hero-section { min-height: 420px; padding: 60px 0 40px; }
            .hero-title { font-size: 2rem; }
            .hero-desc { font-size: 1rem; }
            .hero-stats { gap: 24px; flex-wrap: wrap; }
            .hero-stat-number { font-size: 1.5rem; }

            .section { padding: 56px 0; }
            .section-header { margin-bottom: 36px; }

            .card-grid-3, .card-grid-4, .card-grid-2 { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr; gap: 24px; max-width: 400px; margin: 0 auto; }
            .testimonial-grid { grid-template-columns: 1fr; }
            .scenario-card { flex-direction: column; text-align: center; padding: 28px 24px; }

            .footer-grid { grid-template-columns: 1fr; gap: 32px; }
            .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }

            .cta-section h2 { font-size: 1.8rem; }
            .hero-actions { flex-direction: column; align-items: center; }
            .cta-actions { flex-direction: column; align-items: center; }
            .back-top { bottom: 20px; right: 20px; width: 42px; height: 42px; font-size: 1rem; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            h1 { font-size: 1.7rem; }
            .hero-title { font-size: 1.6rem; }
            .hero-desc { font-size: 0.92rem; }
            .hero-stats { flex-direction: column; gap: 16px; }
            .hero-stat-number { font-size: 1.3rem; }
            .card-img { height: 160px; }
            .feature-card { padding: 28px 18px; }
            .faq-question { padding: 14px 16px; font-size: 0.92rem; }
            .faq-answer { padding: 0 16px 14px; font-size: 0.88rem; }
            .btn-lg { padding: 14px 28px; font-size: 1rem; }
        }