/* roulang page: index */
:root {
            --primary: #1A5CFF;
            --primary-dark: #0F3FCC;
            --primary-soft: #E8F0FE;
            --bg: #F5F7FB;
            --surface: #FFFFFF;
            --text: #111827;
            --muted: #5B6472;
            --line: #E5EAF2;
            --accent: #0F2B46;
            --radius: 16px;
            --radius-sm: 10px;
            --shadow: 0 8px 24px rgba(20,40,80,0.06);
            --shadow-hover: 0 12px 32px rgba(20,40,80,0.10);
            --transition: 180ms ease;
            --max-width: 1200px;
            --section-padding: 80px;
            --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background-color: var(--bg);
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            display: block;
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        section {
            padding: var(--section-padding) 0;
        }
        .section-header {
            margin-bottom: 48px;
        }
        .section-header h2 {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text);
            margin-bottom: 12px;
        }
        .section-header p {
            color: var(--muted);
            font-size: 16px;
            max-width: 720px;
        }
        .text-primary {
            color: var(--primary);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: 999px;
            font-weight: 600;
            font-size: 15px;
            transition: background var(--transition), box-shadow var(--transition), color var(--transition), transform var(--transition);
            white-space: nowrap;
        }
        .btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 8px 16px rgba(26,92,255,0.24);
            transform: translateY(-1px);
            color: #fff;
        }
        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border: 1px solid var(--primary);
        }
        .btn-secondary:hover {
            background: var(--primary-soft);
            color: var(--primary-dark);
            transform: translateY(-1px);
        }
        /* Header / Navigation */
        .site-header {
            background: var(--surface);
            box-shadow: 0 2px 8px rgba(20,40,80,0.04);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .brand-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            padding: 0 24px;
            max-width: var(--max-width);
            margin: 0 auto;
        }
        .logo {
            font-size: 22px;
            font-weight: 700;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            background: var(--primary);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            font-weight: 700;
        }
        .brand-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .search-box {
            display: flex;
            align-items: center;
            background: var(--bg);
            border-radius: 999px;
            padding: 8px 16px;
            border: 1px solid var(--line);
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .search-box input {
            border: none;
            background: transparent;
            outline: none;
            width: 200px;
            font-size: 14px;
            color: var(--text);
        }
        .search-box:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px var(--primary-soft);
        }
        .search-box button {
            color: var(--muted);
            font-size: 18px;
            display: flex;
            align-items: center;
        }
        .login-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--primary);
            padding: 8px 16px;
            border-radius: 999px;
            border: 1px solid transparent;
            transition: background var(--transition), color var(--transition);
        }
        .login-link:hover {
            background: var(--primary-soft);
            color: var(--primary-dark);
        }
        .channel-row {
            background: #fff;
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
            padding: 0 24px;
            max-width: var(--max-width);
            margin: 0 auto;
            display: flex;
            align-items: center;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }
        .channel-row::-webkit-scrollbar {
            display: none;
        }
        .channel-nav {
            display: flex;
            gap: 0;
            align-items: center;
            white-space: nowrap;
        }
        .channel-nav a {
            padding: 14px 20px;
            font-size: 15px;
            font-weight: 500;
            color: var(--muted);
            border-bottom: 3px solid transparent;
            transition: color var(--transition), border-color var(--transition), background var(--transition);
        }
        .channel-nav a:hover {
            color: var(--primary);
            background: var(--primary-soft);
        }
        .channel-nav a.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }
        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 44px;
            height: 44px;
            border-radius: 8px;
            transition: background var(--transition);
        }
        .hamburger span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--text);
            margin: 3px 0;
            transition: transform var(--transition), opacity var(--transition);
        }
        @media (max-width: 768px) {
            .brand-row {
                height: 64px;
            }
            .brand-actions .search-box {
                display: none;
            }
            .brand-actions .login-link {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .channel-row {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: #fff;
                box-shadow: 0 8px 24px rgba(0,0,0,0.08);
                z-index: 99;
                padding: 16px 24px;
                flex-direction: column;
                align-items: stretch;
                overflow-y: auto;
                max-height: 80vh;
            }
            .channel-row.open {
                display: flex;
            }
            .channel-nav {
                flex-direction: column;
                align-items: stretch;
            }
            .channel-nav a {
                padding: 14px 0;
                border-bottom: 1px solid var(--line);
                font-size: 16px;
                text-align: left;
            }
            .channel-nav a:last-child {
                border-bottom: none;
            }
            .channel-nav a.active {
                border-bottom: 1px solid var(--line);
                background: var(--primary-soft);
                color: var(--primary-dark);
                border-left: 3px solid var(--primary);
                padding-left: 12px;
            }
        }
        /* Hero / 指标看板 */
        .hero {
            position: relative;
            background: var(--surface);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/6adfdc60a464e093.webp') center/cover no-repeat;
            opacity: 0.15;
            z-index: 0;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(255,255,255,0.85) 0%, rgba(232,240,254,0.7) 100%);
            z-index: 1;
        }
        .hero-inner {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 6fr 5fr;
            gap: 48px;
            align-items: center;
            padding: 80px 0;
            max-width: var(--max-width);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .hero-left {
            padding-right: 20px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary-soft);
            color: var(--primary);
            padding: 6px 16px;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 20px;
        }
        .hero h1 {
            font-size: 38px;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 20px;
            color: var(--text);
        }
        .hero-subtitle {
            font-size: 16px;
            color: var(--muted);
            max-width: 560px;
            margin-bottom: 32px;
            line-height: 1.7;
        }
        .hero-cta {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }
        .hero-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .hero-stat-item {
            background: rgba(255,255,255,0.8);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 16px;
            text-align: center;
            box-shadow: var(--shadow);
        }
        .hero-stat-value {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
        }
        .hero-stat-label {
            font-size: 13px;
            color: var(--muted);
            margin-top: 4px;
        }
        .hero-right {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            justify-content: center;
        }
        .metric-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 24px;
            flex: 1 1 calc(50% - 12px);
            max-width: calc(50% - 12px);
            min-width: 160px;
            transition: box-shadow var(--transition), transform var(--transition);
        }
        .metric-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .metric-card .icon {
            width: 44px;
            height: 44px;
            background: var(--primary-soft);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--primary);
        }
        .metric-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text);
        }
        .metric-card p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.5;
        }
        .metric-card .value {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 8px;
        }
        @media (max-width: 1024px) {
            .hero-inner {
                grid-template-columns: 1fr;
                gap: 32px;
                padding-top: 60px;
                padding-bottom: 60px;
            }
            .hero-left {
                padding-right: 0;
            }
            .hero h1 {
                font-size: 32px;
            }
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 28px;
            }
            .hero-stats {
                grid-template-columns: 1fr 1fr;
            }
            .hero-right {
                gap: 16px;
            }
            .metric-card {
                max-width: 100%;
                flex: 1 1 100%;
            }
        }
        @media (max-width: 520px) {
            .hero-stats {
                grid-template-columns: 1fr;
            }
        }
        /* 服务矩阵 */
        .service-matrix {
            background: var(--bg);
        }
        .service-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 24px;
        }
        .service-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 28px;
            transition: box-shadow var(--transition), transform var(--transition);
        }
        .service-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .service-card .icon {
            width: 48px;
            height: 48px;
            background: var(--primary-soft);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            color: var(--primary);
            margin-bottom: 16px;
        }
        .service-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .service-card p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.6;
        }
        .service-card.wide {
            grid-column: span 1;
        }
        .service-card.tall {
            grid-column: span 1;
            background: #fff;
        }
        .service-sub-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }
        @media (max-width: 768px) {
            .service-grid {
                grid-template-columns: 1fr;
            }
            .service-sub-grid {
                grid-template-columns: 1fr;
            }
        }
        /* 结果对比 */
        .comparison {
            background: var(--surface);
        }
        .comparison-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: stretch;
        }
        .comparison-card {
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 28px;
        }
        .comparison-card.highlight {
            background: var(--primary-soft);
            border-color: var(--primary);
        }
        .comparison-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .comparison-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 12px;
        }
        .comparison-item .label {
            font-size: 14px;
            color: var(--muted);
        }
        .comparison-item .rating {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
        }
        .rating-bar {
            width: 100px;
            height: 8px;
            background: #E0E6F0;
            border-radius: 999px;
            overflow: hidden;
        }
        .rating-fill {
            height: 100%;
            background: var(--primary);
            border-radius: 999px;
        }
        .comparison-foot {
            margin-top: 20px;
            font-size: 14px;
            color: var(--muted);
        }
        @media (max-width: 768px) {
            .comparison-wrap {
                grid-template-columns: 1fr;
            }
        }
        /* 里程碑 */
        .milestone {
            background: var(--bg);
        }
        .timeline {
            display: flex;
            gap: 24px;
            overflow-x: auto;
            padding-bottom: 16px;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: thin;
        }
        .timeline-item {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 24px;
            min-width: 220px;
            flex: 1 1 220px;
            box-shadow: var(--shadow);
            transition: box-shadow var(--transition), transform var(--transition);
        }
        .timeline-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .timeline-date {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 8px;
        }
        .timeline-item h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .timeline-item p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.5;
        }
        /* 资讯列表 */
        .news {
            background: var(--surface);
        }
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .news-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: box-shadow var(--transition), transform var(--transition);
        }
        .news-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .news-thumb {
            height: 180px;
            background: #f0f4fa;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }
        .news-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .news-body {
            padding: 20px;
        }
        .news-body h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .news-body p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.6;
            margin-bottom: 12px;
        }
        .news-meta {
            font-size: 13px;
            color: var(--muted);
            display: flex;
            align-items: center;
            gap: 12px;
        }
        @media (max-width: 520px) {
            .news-grid {
                grid-template-columns: 1fr;
            }
        }
        /* 热门专题 / 分类入口 */
        .special-entry {
            background: var(--bg);
        }
        .entry-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .entry-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 24px;
            transition: box-shadow var(--transition), transform var(--transition);
        }
        .entry-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .entry-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .entry-card p {
            font-size: 14px;
            color: var(--muted);
            margin-bottom: 16px;
            line-height: 1.6;
        }
        .entry-link {
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .entry-link:hover {
            color: var(--primary-dark);
        }
        @media (max-width: 768px) {
            .entry-grid {
                grid-template-columns: 1fr;
            }
        }
        /* 平台保障 */
        .assurance {
            background: var(--surface);
        }
        .assurance-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .assurance-item {
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 24px;
            text-align: center;
        }
        .assurance-item .icon {
            width: 48px;
            height: 48px;
            background: var(--primary-soft);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--primary);
            margin-bottom: 16px;
        }
        .assurance-item h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .assurance-item p {
            font-size: 14px;
            color: var(--muted);
        }
        @media (max-width: 768px) {
            .assurance-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 520px) {
            .assurance-grid {
                grid-template-columns: 1fr;
            }
        }
        /* 快速解答 */
        .quick-qa {
            background: var(--bg);
        }
        .qa-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }
        .qa-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow);
        }
        .qa-card h3 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text);
        }
        .qa-card p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.6;
        }
        @media (max-width: 768px) {
            .qa-grid {
                grid-template-columns: 1fr;
            }
        }
        /* FAQ */
        .faq {
            background: var(--surface);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            margin-bottom: 12px;
            box-shadow: 0 2px 4px rgba(20,40,80,0.02);
            transition: border-color var(--transition);
        }
        .faq-item[open] {
            border-color: var(--primary);
        }
        .faq-question {
            padding: 16px 20px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            list-style: none;
        }
        .faq-question::-webkit-details-marker {
            display: none;
        }
        .faq-question::after {
            content: '+';
            font-size: 24px;
            font-weight: 400;
            color: var(--primary);
            transition: transform var(--transition);
        }
        .faq-item[open] .faq-question::after {
            transform: rotate(45deg);
        }
        .faq-answer {
            padding: 0 20px 20px;
            font-size: 14px;
            color: var(--muted);
            line-height: 1.6;
        }
        /* 播放场景 */
        .scenarios {
            background: var(--bg);
        }
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .scenario-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 24px;
            text-align: center;
            box-shadow: var(--shadow);
            transition: box-shadow var(--transition), transform var(--transition);
        }
        .scenario-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .scenario-card .icon {
            width: 48px;
            height: 48px;
            background: #fff0e5;
            border-radius: 12px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 16px;
            color: #e65100;
        }
        .scenario-card h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .scenario-card p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.5;
        }
        @media (max-width: 768px) {
            .scenario-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 520px) {
            .scenario-grid {
                grid-template-columns: 1fr;
            }
        }
        /* 更新日历 */
        .update-calendar {
            background: var(--surface);
        }
        .calendar-wrap {
            display: flex;
            gap: 20px;
            overflow-x: auto;
            padding-bottom: 16px;
        }
        .calendar-item {
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 20px;
            min-width: 200px;
            flex: 1 1 200px;
            text-align: center;
        }
        .calendar-day {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
        }
        .calendar-date {
            font-size: 14px;
            color: var(--muted);
            margin-bottom: 8px;
        }
        .calendar-item h3 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .calendar-item p {
            font-size: 14px;
            color: var(--muted);
        }
        /* 转化表单 */
        .cta-form {
            background: var(--bg);
        }
        .form-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 40px;
            max-width: 640px;
            margin: 0 auto;
        }
        .form-card h2 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 12px;
            text-align: center;
        }
        .form-card p {
            text-align: center;
            color: var(--muted);
            margin-bottom: 28px;
            font-size: 15px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text);
        }
        .form-group input,
        .form-group select {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--line);
            border-radius: var(--radius-sm);
            background: #fff;
            font-size: 15px;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .form-group input:focus,
        .form-group select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px var(--primary-soft);
        }
        .form-submit {
            width: 100%;
            padding: 14px;
            font-size: 16px;
            font-weight: 600;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .form-submit:hover {
            background: var(--primary-dark);
            box-shadow: 0 8px 16px rgba(26,92,255,0.24);
        }
        .form-submit:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        @media (max-width: 520px) {
            .form-card {
                padding: 24px;
            }
        }
        /* Footer */
        .site-footer {
            background: var(--accent);
            color: rgba(255,255,255,0.8);
            padding: 60px 0 24px;
        }
        .footer-wrap {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand h3 {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.6;
            opacity: 0.8;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255,255,255,0.7);
            font-size: 14px;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.15);
            padding-top: 24px;
            text-align: center;
            font-size: 13px;
            color: rgba(255,255,255,0.5);
        }
        @media (max-width: 768px) {
            .footer-wrap {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 520px) {
            .footer-wrap {
                grid-template-columns: 1fr;
            }
            .site-footer {
                padding: 40px 0 20px;
            }
        }
        /* Utility */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            white-space: nowrap;
            border: 0;
        }

/* roulang page: category1 */
:root {
            --primary: #1A5CFF;
            --primary-dark: #0F3FCC;
            --primary-soft: #E8F0FE;
            --bg: #F5F7FB;
            --surface: #FFFFFF;
            --text: #111827;
            --muted: #5B6472;
            --line: #E5EAF2;
            --accent: #0F2B46;
            --radius: 16px;
            --radius-sm: 10px;
            --shadow: 0 8px 24px rgba(20,40,80,0.06);
            --shadow-hover: 0 12px 32px rgba(20,40,80,0.10);
            --transition: 180ms ease;
            --max-width: 1200px;
            --section-padding: 80px;
            --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background-color: var(--bg);
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        section {
            padding: var(--section-padding) 0;
        }
        .section-header {
            margin-bottom: 40px;
        }
        .section-header h2 {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.35;
            color: var(--text);
            margin-bottom: 12px;
        }
        .section-header p {
            color: var(--muted);
            font-size: 16px;
            max-width: 720px;
            line-height: 1.7;
        }
        .text-primary {
            color: var(--primary);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: 999px;
            font-weight: 600;
            font-size: 15px;
            transition: background var(--transition), box-shadow var(--transition), color var(--transition), transform var(--transition);
            white-space: nowrap;
            gap: 8px;
        }
        .btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 8px 16px rgba(26,92,255,0.24);
            transform: translateY(-1px);
            color: #fff;
        }
        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border: 1px solid var(--primary);
        }
        .btn-secondary:hover {
            background: var(--primary-soft);
            color: var(--primary-dark);
            transform: translateY(-1px);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 14px;
        }

        /* Header / Navigation */
        .site-header {
            background: var(--surface);
            box-shadow: 0 2px 8px rgba(20,40,80,0.04);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .brand-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            padding: 0 24px;
            max-width: var(--max-width);
            margin: 0 auto;
        }
        .logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 10px;
            white-space: nowrap;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            background: var(--primary);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            font-weight: 700;
            flex-shrink: 0;
        }
        .brand-actions {
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .search-box {
            display: flex;
            align-items: center;
            background: var(--bg);
            border-radius: 999px;
            padding: 8px 16px;
            border: 1px solid var(--line);
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .search-box input {
            border: none;
            background: transparent;
            outline: none;
            width: 180px;
            font-size: 14px;
            color: var(--text);
        }
        .search-box:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px var(--primary-soft);
        }
        .search-box button {
            color: var(--muted);
            font-size: 16px;
            display: flex;
            align-items: center;
            padding: 0;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            transition: background var(--transition);
        }
        .hamburger:hover {
            background: var(--primary-soft);
        }
        .hamburger span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            transition: all var(--transition);
        }
        .channel-row {
            background: #fff;
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
            padding: 0 24px;
            max-width: var(--max-width);
            margin: 0 auto;
            display: flex;
            align-items: center;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }
        .channel-row::-webkit-scrollbar {
            display: none;
        }
        .channel-nav {
            display: flex;
            gap: 0;
            align-items: center;
            white-space: nowrap;
        }
        .channel-nav a {
            padding: 14px 20px;
            font-size: 15px;
            font-weight: 500;
            color: var(--muted);
            border-bottom: 3px solid transparent;
            transition: color var(--transition), border-color var(--transition), background var(--transition);
        }
        .channel-nav a:hover {
            color: var(--primary);
            background: var(--primary-soft);
        }
        .channel-nav a.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
            font-weight: 600;
        }
        .mobile-panel {
            display: none;
            background: #fff;
            border-bottom: 1px solid var(--line);
            padding: 16px 24px;
            gap: 12px;
            flex-direction: column;
        }
        .mobile-panel.open {
            display: flex;
        }
        .mobile-panel .search-box {
            width: 100%;
        }
        .mobile-panel .search-box input {
            width: 100%;
        }
        .mobile-panel .btn {
            width: 100%;
            justify-content: center;
        }

        /* Breadcrumb / Category H1 */
        .category-hero {
            padding: 48px 0 40px;
            background: var(--surface);
            border-bottom: 1px solid var(--line);
            position: relative;
            overflow: hidden;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(255,255,255,0.92) 0%, rgba(232,240,254,0.75) 60%, rgba(255,255,255,0.88) 100%);
            z-index: 0;
        }
        .category-hero .container {
            position: relative;
            z-index: 1;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--muted);
            margin-bottom: 16px;
        }
        .breadcrumb a {
            color: var(--muted);
            transition: color var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .separator {
            color: var(--line);
        }
        .breadcrumb .current {
            color: var(--primary);
            font-weight: 600;
        }
        .category-hero h1 {
            font-size: 34px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text);
            margin-bottom: 10px;
        }
        .category-hero .hero-desc {
            color: var(--muted);
            font-size: 16px;
            max-width: 680px;
            line-height: 1.7;
        }

        /* Filter Tags */
        .filter-section {
            padding: 24px 0 8px;
        }
        .filter-wrap {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 16px 20px;
            box-shadow: var(--shadow);
        }
        .filter-tags {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
        }
        .filter-tag {
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            color: var(--muted);
            background: var(--bg);
            border: 1px solid var(--line);
            transition: all var(--transition);
            cursor: pointer;
        }
        .filter-tag:hover {
            color: var(--primary);
            border-color: var(--primary);
            background: var(--primary-soft);
        }
        .filter-tag.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            font-weight: 600;
        }
        .filter-sort {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--muted);
        }
        .filter-sort select {
            padding: 8px 14px;
            border-radius: 8px;
            border: 1px solid var(--line);
            background: var(--surface);
            color: var(--text);
            font-size: 14px;
            outline: none;
            cursor: pointer;
            transition: border-color var(--transition);
        }
        .filter-sort select:focus {
            border-color: var(--primary);
        }

        /* Card List Layout */
        .list-section {
            padding: 40px 0 64px;
        }
        .list-layout {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 28px;
            align-items: start;
        }
        .card-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .list-card {
            display: flex;
            gap: 20px;
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow);
            transition: box-shadow var(--transition), transform var(--transition);
        }
        .list-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }
        .list-card .card-img {
            width: 200px;
            height: 132px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--primary-soft);
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .list-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .list-card .card-img .img-placeholder {
            color: var(--primary);
            font-size: 32px;
            font-weight: 700;
        }
        .card-info {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            gap: 8px;
        }
        .card-info h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            line-height: 1.4;
        }
        .card-info h3 a:hover {
            color: var(--primary);
        }
        .card-info p {
            color: var(--muted);
            font-size: 14px;
            line-height: 1.6;
        }
        .card-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: var(--muted);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 10px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 500;
            background: var(--primary-soft);
            color: var(--primary);
        }
        .badge-green {
            background: #E6F7ED;
            color: #1A7F4B;
        }
        .badge-orange {
            background: #FFF4E6;
            color: #B45D00;
        }
        .more-link-wrap {
            display: flex;
            justify-content: center;
            margin-top: 8px;
        }
        .more-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            border: 1px solid var(--primary);
            transition: all var(--transition);
        }
        .more-link:hover {
            background: var(--primary-soft);
            color: var(--primary-dark);
        }

        /* Sidebar */
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .sidebar-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow);
        }
        .sidebar-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
        }
        .sidebar-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .sidebar-tags a {
            padding: 6px 14px;
            border-radius: 999px;
            font-size: 13px;
            background: var(--bg);
            color: var(--muted);
            border: 1px solid var(--line);
            transition: all var(--transition);
        }
        .sidebar-tags a:hover {
            color: var(--primary);
            border-color: var(--primary);
            background: var(--primary-soft);
        }
        .sidebar-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .sidebar-list-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--muted);
            transition: color var(--transition);
        }
        .sidebar-list-item:hover {
            color: var(--primary);
        }
        .sidebar-list-item .dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--primary);
            flex-shrink: 0;
        }

        /* Stats */
        .stats-section {
            padding: 48px 0 64px;
            background: var(--surface);
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 24px 20px;
            text-align: center;
            border: 1px solid var(--line);
            transition: box-shadow var(--transition), transform var(--transition);
        }
        .stat-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }
        .stat-value {
            font-size: 32px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stat-label {
            font-size: 14px;
            color: var(--muted);
        }

        /* Related Topics */
        .topics-section {
            padding: 64px 0;
            background: var(--bg);
        }
        .topics-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .topic-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 24px 20px;
            box-shadow: var(--shadow);
            transition: box-shadow var(--transition), transform var(--transition);
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .topic-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }
        .topic-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text);
        }
        .topic-card p {
            font-size: 14px;
            color: var(--muted);
            flex: 1;
        }
        .topic-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .topic-link::after {
            content: '→';
            font-size: 16px;
            transition: transform var(--transition);
        }
        .topic-link:hover::after {
            transform: translateX(4px);
        }

        /* FAQ */
        .faq-section {
            padding: 64px 0;
            background: var(--surface);
            border-top: 1px solid var(--line);
        }
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            max-width: 820px;
        }
        .faq-item {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary);
        }
        .faq-item details {
            width: 100%;
        }
        .faq-item summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            list-style: none;
            gap: 16px;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: '+';
            font-size: 22px;
            color: var(--primary);
            font-weight: 400;
            transition: transform var(--transition);
        }
        .faq-item details[open] summary::after {
            transform: rotate(45deg);
        }
        .faq-item .faq-body {
            padding: 0 20px 16px;
            color: var(--muted);
            font-size: 14px;
            line-height: 1.7;
        }

        /* Subscribe Form */
        .subscribe-section {
            padding: 64px 0 80px;
            background: var(--bg);
        }
        .subscribe-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 32px 28px;
            box-shadow: var(--shadow);
            max-width: 720px;
            margin: 0 auto;
            text-align: center;
        }
        .subscribe-card h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 10px;
        }
        .subscribe-card p {
            color: var(--muted);
            font-size: 15px;
            margin-bottom: 20px;
        }
        .subscribe-form {
            display: flex;
            gap: 12px;
            max-width: 520px;
            margin: 0 auto;
        }
        .subscribe-form input[type="email"],
        .subscribe-form input[type="text"] {
            flex: 1;
            padding: 12px 18px;
            border-radius: 999px;
            border: 1px solid var(--line);
            background: var(--bg);
            font-size: 15px;
            color: var(--text);
            outline: none;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .subscribe-form input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px var(--primary-soft);
        }
        .form-note {
            font-size: 13px;
            color: var(--muted);
            margin-top: 12px;
        }

        /* Footer */
        .site-footer {
            background: var(--accent);
            color: #D1D8E0;
            padding: 56px 0 24px;
        }
        .footer-wrap {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand h3 {
            color: #fff;
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: #B8C4D0;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 14px;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col ul li a {
            color: #B8C4D0;
            font-size: 14px;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.12);
            padding-top: 20px;
            text-align: center;
            font-size: 13px;
            color: #8FA0B5;
        }

        /* Responsive */
        @media (max-width: 1023px) {
            :root {
                --section-padding: 64px;
            }
            .section-header h2 {
                font-size: 24px;
            }
            .category-hero h1 {
                font-size: 28px;
            }
            .list-layout {
                grid-template-columns: 1fr;
            }
            .sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .topics-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .footer-wrap {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }
        @media (max-width: 767px) {
            :root {
                --section-padding: 48px;
            }
            .section-header h2 {
                font-size: 22px;
            }
            .category-hero {
                padding: 32px 0;
            }
            .category-hero h1 {
                font-size: 24px;
            }
            .category-hero .hero-desc {
                font-size: 14px;
            }
            .search-box {
                display: none;
            }
            .brand-actions .btn {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .mobile-panel {
                display: none;
            }
            .mobile-panel.open {
                display: flex;
            }
            .channel-row {
                padding: 0 8px;
            }
            .channel-nav a {
                padding: 12px 14px;
                font-size: 14px;
            }
            .filter-wrap {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
                padding: 14px;
            }
            .list-card {
                flex-direction: column;
                gap: 14px;
                padding: 16px;
            }
            .list-card .card-img {
                width: 100%;
                height: 180px;
            }
            .sidebar {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-value {
                font-size: 26px;
            }
            .topics-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .subscribe-card {
                padding: 24px 18px;
            }
            .subscribe-form {
                flex-direction: column;
                gap: 10px;
            }
            .subscribe-form input[type="email"],
            .subscribe-form input[type="text"] {
                width: 100%;
                border-radius: 10px;
            }
            .subscribe-form .btn {
                width: 100%;
                border-radius: 10px;
            }
            .footer-wrap {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-brand p {
                font-size: 13px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .brand-row {
                padding: 0 16px;
            }
            .logo {
                font-size: 17px;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 15px;
            }
            .category-hero h1 {
                font-size: 21px;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .filter-tag {
                padding: 6px 12px;
                font-size: 13px;
            }
            .list-card .card-img {
                height: 150px;
            }
        }