/* roulang page: index */
:root {
            --primary: #2F6B9E;
            --primary-dark: #24507A;
            --primary-light: #E8F0F7;
            --accent-green: #4C9F70;
            --accent-orange: #E08A3C;
            --bg: #F5F7FA;
            --card-bg: #FFFFFF;
            --text-primary: #1F2A37;
            --text-secondary: #5A6B7A;
            --text-light: #8A97A5;
            --border: #E6EBF0;
            --border-strong: #D0D7DE;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 2px 8px rgba(31, 42, 55, 0.05);
            --shadow-md: 0 8px 24px rgba(31, 42, 55, 0.06);
            --shadow-lg: 0 12px 32px rgba(31, 42, 55, 0.12);
            --transition: 0.2s ease;
            --nav-width: 260px;
            --content-max: 1200px;
            --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --spacing-section: 80px;
            --spacing-card: 24px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover {
            color: var(--primary-dark);
        }

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

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

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

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 3px solid rgba(47, 107, 158, 0.35);
            outline-offset: 2px;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            max-width: var(--content-max);
            margin: 0 auto;
            padding: 0 40px;
        }

        .section {
            padding: var(--spacing-section) 0;
        }

        .section-alt {
            background-color: var(--card-bg);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .section-header {
            margin-bottom: 40px;
        }

        .section-label {
            display: inline-block;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: 1.5px;
            text-transform: uppercase;
            margin-bottom: 10px;
        }

        .section-title {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            letter-spacing: 0.3px;
            transition: all var(--transition);
            min-height: 44px;
            text-align: center;
            white-space: nowrap;
        }

        .btn-primary {
            background-color: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(47, 107, 158, 0.25);
        }

        .btn-primary:hover {
            background-color: var(--primary-dark);
            box-shadow: 0 6px 20px rgba(47, 107, 158, 0.35);
            color: #fff;
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(47, 107, 158, 0.3);
        }

        .btn-secondary {
            background-color: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

        .btn-secondary:hover {
            background-color: var(--primary-light);
            border-color: var(--primary-dark);
            color: var(--primary-dark);
            transform: translateY(-1px);
        }

        .btn-secondary:active {
            transform: translateY(0);
        }

        .btn-accent {
            background-color: var(--accent-green);
            color: #fff;
            box-shadow: 0 4px 12px rgba(76, 159, 112, 0.25);
        }

        .btn-accent:hover {
            background-color: #3D8A5E;
            box-shadow: 0 6px 18px rgba(76, 159, 112, 0.35);
            color: #fff;
            transform: translateY(-1px);
        }

        .card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            padding: var(--spacing-card);
            transition: all var(--transition);
        }

        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--border-strong);
        }

        .tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.5px;
            background-color: var(--primary-light);
            color: var(--primary);
        }

        .tag-green {
            background-color: #E8F5EE;
            color: var(--accent-green);
        }

        .tag-orange {
            background-color: #FEF3E8;
            color: var(--accent-orange);
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 10px;
            border-radius: 6px;
            font-size: 12px;
            font-weight: 600;
            background-color: var(--primary-light);
            color: var(--primary);
        }

        /* Sidebar Navigation */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background-color: #F9FAFB;
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            z-index: 100;
            transition: transform var(--transition);
        }

        .sidebar-brand {
            height: 72px;
            display: flex;
            align-items: center;
            padding: 0 24px;
            border-bottom: 1px solid var(--border);
            flex-shrink: 0;
        }

        .sidebar-brand a {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .sidebar-brand a:hover {
            color: var(--primary);
        }

        .brand-icon {
            width: 32px;
            height: 32px;
            background: var(--primary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            font-weight: 800;
            flex-shrink: 0;
        }

        .sidebar-nav {
            flex: 1;
            padding: 24px 16px;
            display: flex;
            flex-direction: column;
            gap: 4px;
            overflow-y: auto;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            min-height: 44px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition);
            position: relative;
        }

        .sidebar-nav a::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 0;
            background-color: var(--primary);
            border-radius: 0 3px 3px 0;
            transition: height var(--transition);
        }

        .sidebar-nav a:hover {
            background-color: var(--primary-light);
            color: var(--primary);
        }

        .sidebar-nav a.active {
            background-color: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
        }

        .sidebar-nav a.active::before {
            height: 24px;
        }

        .sidebar-nav .nav-icon {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            opacity: 0.7;
        }

        .sidebar-footer {
            padding: 16px 24px;
            border-top: 1px solid var(--border);
            flex-shrink: 0;
        }

        .sidebar-footer a {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-light);
            padding: 6px 0;
            transition: color var(--transition);
        }

        .sidebar-footer a:hover {
            color: var(--primary);
        }

        /* Main Content */
        .main-wrapper {
            margin-left: var(--nav-width);
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        /* Mobile Nav */
        .mobile-nav {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 200;
            background-color: #F9FAFB;
            border-bottom: 1px solid var(--border);
            padding: 0 16px;
            height: 60px;
            align-items: center;
            justify-content: space-between;
        }

        .mobile-nav .brand {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .hamburger {
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            font-size: 24px;
        }

        .hamburger:hover {
            background-color: var(--primary-light);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 60px;
            left: 0;
            right: 0;
            z-index: 199;
            background-color: #F9FAFB;
            border-bottom: 1px solid var(--border);
            padding: 16px;
            box-shadow: var(--shadow-lg);
            flex-direction: column;
            gap: 4px;
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 14px 16px;
            min-height: 44px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition);
        }

        .mobile-menu a:hover,
        .mobile-menu a.active {
            background-color: var(--primary-light);
            color: var(--primary);
        }

        /* Hero Section */
        .hero {
            background-color: var(--card-bg);
            border-bottom: 1px solid var(--border);
            padding: 60px 0 70px;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent-green), var(--accent-orange));
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .hero-content {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--primary-light);
            color: var(--primary);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            width: fit-content;
        }

        .hero-title {
            font-size: 38px;
            font-weight: 700;
            line-height: 1.35;
            color: var(--text-primary);
            letter-spacing: -0.5px;
        }

        .hero-subtitle {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 540px;
        }

        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-top: 8px;
        }

        .hero-image {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }

        .hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--radius-lg);
        }

        .hero-image-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 24px;
            background: linear-gradient(transparent, rgba(31, 42, 55, 0.85));
            color: #fff;
            font-size: 14px;
            font-weight: 500;
            border-radius: 0 0 var(--radius-lg) var(--radius-lg);
        }

        /* Pain Points */
        .pain-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 32px;
        }

        .pain-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .pain-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: var(--border-strong);
        }

        .pain-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            flex-shrink: 0;
        }

        .pain-icon.blue {
            background-color: var(--primary-light);
            color: var(--primary);
        }
        .pain-icon.green {
            background-color: #E8F5EE;
            color: var(--accent-green);
        }
        .pain-icon.orange {
            background-color: #FEF3E8;
            color: var(--accent-orange);
        }

        .pain-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .pain-card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Solution Section */
        .solution-layout {
            display: grid;
            grid-template-columns: 1fr 1.4fr;
            gap: 40px;
            margin-top: 32px;
            align-items: start;
        }

        .solution-intro {
            padding: 32px 28px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
        }

        .solution-intro h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 14px;
            line-height: 1.4;
        }

        .solution-intro p {
            font-size: 15px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.9);
        }

        .solution-cards {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .solution-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px 28px;
            box-shadow: var(--shadow-sm);
            display: flex;
            gap: 20px;
            align-items: flex-start;
            transition: all var(--transition);
        }

        .solution-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
            border-color: var(--border-strong);
        }

        .solution-card .s-icon {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            flex-shrink: 0;
        }

        .solution-card .s-icon.blue {
            background-color: var(--primary-light);
            color: var(--primary);
        }
        .solution-card .s-icon.green {
            background-color: #E8F5EE;
            color: var(--accent-green);
        }
        .solution-card .s-icon.orange {
            background-color: #FEF3E8;
            color: var(--accent-orange);
        }

        .solution-card h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 6px;
        }

        .solution-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Steps */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 32px;
        }

        .step-item {
            position: relative;
            padding: 28px 20px;
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            text-align: center;
            transition: all var(--transition);
        }

        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }

        .step-number {
            width: 40px;
            height: 40px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 700;
            margin: 0 auto 14px;
        }

        .step-item h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .step-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .step-arrow {
            position: absolute;
            top: 50%;
            right: -18px;
            transform: translateY(-50%);
            font-size: 20px;
            color: var(--border-strong);
            z-index: 1;
        }

        /* Stats / Results */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 32px;
        }

        .stat-item {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 28px 20px;
            text-align: center;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }

        .stat-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: var(--border-strong);
        }

        .stat-number {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            letter-spacing: -0.5px;
        }

        .stat-label {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 8px;
            font-weight: 500;
        }

        /* Brand Intro */
        .brand-intro {
            display: grid;
            grid-template-columns: 1.3fr 1fr;
            gap: 40px;
            align-items: center;
            margin-top: 32px;
        }

        .brand-intro .brand-text {
            padding: 32px 28px;
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

        .brand-intro .brand-text h3 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .brand-intro .brand-text p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 12px;
        }

        .brand-intro .brand-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }

        .brand-intro .brand-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* Data Indicators */
        .data-bars {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-top: 32px;
            padding: 32px 28px;
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

        .data-bar {
            display: grid;
            grid-template-columns: 140px 1fr 50px;
            align-items: center;
            gap: 16px;
        }

        .data-bar-label {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
        }

        .data-bar-track {
            height: 10px;
            background: var(--bg);
            border-radius: 20px;
            overflow: hidden;
        }

        .data-bar-fill {
            height: 100%;
            border-radius: 20px;
            background: linear-gradient(90deg, var(--primary), var(--accent-green));
            transition: width 0.6s ease;
        }

        .data-bar-value {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-primary);
            text-align: right;
        }

        /* Testimonials */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 32px;
        }

        .testimonial-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            gap: 14px;
            transition: all var(--transition);
        }

        .testimonial-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .testimonial-card .quote {
            font-size: 15px;
            line-height: 1.8;
            color: var(--text-secondary);
            font-style: italic;
        }

        .testimonial-card .user {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .testimonial-card .avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
            flex-shrink: 0;
        }

        .testimonial-card .user-info .name {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .testimonial-card .user-info .role {
            font-size: 13px;
            color: var(--text-light);
        }

        /* Audience Tags */
        .audience-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 32px;
        }

        .audience-tag {
            padding: 10px 20px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 24px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
            transition: all var(--transition);
            cursor: default;
            min-height: 44px;
            display: flex;
            align-items: center;
        }

        .audience-tag:hover {
            background: var(--primary-light);
            color: var(--primary);
            border-color: var(--primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        /* News Section */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 32px;
        }

        .news-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            transition: all var(--transition);
        }

        .news-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }

        .news-card .news-thumb {
            height: 180px;
            overflow: hidden;
            position: relative;
        }

        .news-card .news-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
            transition: transform var(--transition);
        }

        .news-card:hover .news-thumb img {
            transform: scale(1.05);
        }

        .news-card .news-body {
            padding: 20px 20px 24px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            flex: 1;
        }

        .news-card .news-date {
            font-size: 13px;
            color: var(--text-light);
            font-weight: 500;
        }

        .news-card h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.4;
        }

        .news-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
        }

        .news-card .read-more {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition);
            padding: 8px 0;
        }

        .news-card .read-more:hover {
            color: var(--primary-dark);
            gap: 10px;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, #3A7BA8 100%);
            border-radius: var(--radius-lg);
            padding: 48px 40px;
            text-align: center;
            color: #fff;
            margin-top: 32px;
            box-shadow: var(--shadow-lg);
        }

        .cta-section h3 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 14px;
            line-height: 1.4;
        }

        .cta-section p {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.88);
            max-width: 600px;
            margin: 0 auto 24px;
            line-height: 1.8;
        }

        .cta-section .btn {
            background-color: #fff;
            color: var(--primary-dark);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
        }

        .cta-section .btn:hover {
            background-color: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: 32px;
            max-width: 800px;
        }

        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition);
        }

        .faq-item:hover {
            border-color: var(--border-strong);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 20px;
            background: transparent;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            text-align: left;
            min-height: 44px;
            transition: all var(--transition);
        }

        .faq-question:hover {
            background-color: var(--primary-light);
        }

        .faq-question .faq-arrow {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            transition: transform var(--transition);
            color: var(--text-secondary);
        }

        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            padding: 0 20px;
        }

        .faq-item.open .faq-answer {
            max-height: 400px;
            padding: 0 20px 18px;
        }

        .faq-answer p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* Footer */
        .footer {
            background-color: #1F2A37;
            color: rgba(255, 255, 255, 0.8);
            padding: 48px 0 32px;
            margin-top: 60px;
        }

        .footer-content {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 40px;
        }

        .footer-brand {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .footer-brand .brand-name {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.7;
            max-width: 320px;
        }

        .footer-links h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }

        .footer-links a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            padding: 6px 0;
            transition: color var(--transition);
        }

        .footer-links a:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            margin-top: 32px;
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
        }

        .footer-bottom .fixed-links {
            display: flex;
            gap: 16px;
            align-items: center;
        }

        .footer-bottom .fixed-links a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 13px;
            transition: color var(--transition);
        }

        .footer-bottom .fixed-links a:hover {
            color: #fff;
        }

        .footer-bottom .divider {
            color: rgba(255, 255, 255, 0.3);
        }

        /* Responsive */
        @media (max-width: 1199px) {
            .hero-title {
                font-size: 32px;
            }
            .hero-grid {
                gap: 32px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .step-arrow {
                display: none;
            }
        }

        @media (max-width: 991px) {
            .sidebar {
                display: none;
            }
            .main-wrapper {
                margin-left: 0;
            }
            .mobile-nav {
                display: flex;
            }
            .main-wrapper {
                padding-top: 60px;
            }
            .container {
                padding: 0 28px;
            }
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .hero-title {
                font-size: 30px;
            }
            .pain-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .solution-layout {
                grid-template-columns: 1fr;
            }
            .brand-intro {
                grid-template-columns: 1fr;
            }
            .testimonials-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-content {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 767px) {
            .container {
                padding: 0 16px;
            }
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 24px;
            }
            .hero-title {
                font-size: 26px;
            }
            .hero-subtitle {
                font-size: 15px;
            }
            .hero-actions {
                flex-direction: column;
                gap: 10px;
            }
            .hero-actions .btn {
                width: 100%;
            }
            .pain-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .stat-number {
                font-size: 28px;
            }
            .data-bar {
                grid-template-columns: 110px 1fr 40px;
                gap: 10px;
            }
            .data-bar-label {
                font-size: 12px;
            }
            .testimonials-grid {
                grid-template-columns: 1fr;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .cta-section {
                padding: 32px 20px;
            }
            .cta-section h3 {
                font-size: 22px;
            }
            .footer-content {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                justify-content: center;
            }
            .footer-bottom .fixed-links {
                flex-wrap: wrap;
                justify-content: center;
            }
            .brand-intro {
                gap: 20px;
            }
            .brand-intro .brand-text {
                padding: 20px 18px;
            }
            .solution-card {
                padding: 18px 16px;
                flex-direction: column;
                gap: 12px;
            }
        }

        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .stat-number {
                font-size: 24px;
            }
            .stat-label {
                font-size: 12px;
            }
            .data-bar {
                grid-template-columns: 90px 1fr 35px;
                gap: 6px;
            }
            .data-bar-label {
                font-size: 11px;
            }
            .data-bar-value {
                font-size: 12px;
            }
            .section-title {
                font-size: 22px;
            }
            .testimonial-card {
                padding: 20px 18px;
            }
            .news-card .news-thumb {
                height: 160px;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #2F6B9E;
            --primary-dark: #24507A;
            --primary-light: #E8F0F7;
            --accent-green: #4C9F70;
            --accent-orange: #E08A3C;
            --bg: #F5F7FA;
            --card-bg: #FFFFFF;
            --text-primary: #1F2A37;
            --text-secondary: #5A6B7A;
            --text-light: #8A97A5;
            --border: #E6EBF0;
            --border-strong: #D0D7DE;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 2px 8px rgba(31, 42, 55, 0.05);
            --shadow-md: 0 8px 24px rgba(31, 42, 55, 0.06);
            --shadow-lg: 0 12px 32px rgba(31, 42, 55, 0.12);
            --transition: 0.2s ease;
            --nav-width: 260px;
            --content-max: 1200px;
            --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --spacing-section: 80px;
            --spacing-card: 24px;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button, input, textarea, select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            outline: none;
            background: none;
        }
        button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible {
            outline: 3px solid rgba(47, 107, 158, 0.35);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--content-max);
            margin: 0 auto;
            padding: 0 40px;
        }
        .section {
            padding: var(--spacing-section) 0;
        }
        .section-alt {
            background-color: var(--card-bg);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .section-header {
            margin-bottom: 40px;
        }
        .section-label {
            display: inline-block;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: 1.5px;
            text-transform: uppercase;
            margin-bottom: 10px;
        }
        .section-title {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            letter-spacing: 0.3px;
            transition: all var(--transition);
            min-height: 44px;
            text-align: center;
            white-space: nowrap;
        }
        .btn-primary {
            background-color: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(47, 107, 158, 0.25);
        }
        .btn-primary:hover {
            background-color: var(--primary-dark);
            box-shadow: 0 6px 20px rgba(47, 107, 158, 0.35);
            color: #fff;
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(47, 107, 158, 0.3);
        }
        .btn-secondary {
            background-color: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-secondary:hover {
            background-color: var(--primary-light);
            border-color: var(--primary-dark);
            color: var(--primary-dark);
            transform: translateY(-1px);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }
        .btn-accent {
            background-color: var(--accent-green);
            color: #fff;
            box-shadow: 0 4px 12px rgba(76, 159, 112, 0.25);
        }
        .btn-accent:hover {
            background-color: #3D8A5E;
            box-shadow: 0 6px 18px rgba(76, 159, 112, 0.35);
            color: #fff;
            transform: translateY(-1px);
        }
        .card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            padding: var(--spacing-card);
            transition: all var(--transition);
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--border-strong);
        }
        .tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.5px;
            background-color: var(--primary-light);
            color: var(--primary);
        }
        .tag-green {
            background-color: #E8F5EE;
            color: var(--accent-green);
        }
        .tag-orange {
            background-color: #FEF3E8;
            color: var(--accent-orange);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            background: var(--primary-light);
            color: var(--primary);
        }
        .badge-green {
            background: #E8F5EE;
            color: var(--accent-green);
        }
        .badge-orange {
            background: #FEF3E8;
            color: var(--accent-orange);
        }

        /* Sidebar Layout */
        .app-wrapper {
            display: flex;
            min-height: 100vh;
            flex: 1;
        }
        .sidebar {
            width: var(--nav-width);
            background: #FBFCFE;
            border-right: 1px solid var(--border);
            position: fixed;
            top: 0;
            left: 0;
            height: 100vh;
            display: flex;
            flex-direction: column;
            z-index: 100;
            transition: transform var(--transition);
        }
        .sidebar-header {
            height: 72px;
            display: flex;
            align-items: center;
            padding: 0 20px;
            border-bottom: 1px solid var(--border);
            flex-shrink: 0;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 20px;
            color: var(--text-primary);
            letter-spacing: 0.5px;
        }
        .brand-logo .logo-icon {
            width: 32px;
            height: 32px;
            background: var(--primary);
            border-radius: 8px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
        }
        .sidebar-nav {
            flex: 1;
            padding: 20px 12px;
            overflow-y: auto;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: 8px;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 15px;
            transition: all var(--transition);
            position: relative;
        }
        .sidebar-nav a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .sidebar-nav a.active {
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
        }
        .sidebar-nav a.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--primary);
            border-radius: 0 2px 2px 0;
        }
        .nav-icon {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
        }
        .sidebar-tools {
            padding: 16px 20px;
            border-top: 1px solid var(--border);
            display: flex;
            gap: 16px;
            flex-shrink: 0;
        }
        .sidebar-tools a {
            font-size: 13px;
            color: var(--text-light);
            transition: color var(--transition);
        }
        .sidebar-tools a:hover {
            color: var(--primary);
        }

        .main-content {
            flex: 1;
            margin-left: var(--nav-width);
            min-width: 0;
            display: flex;
            flex-direction: column;
        }

        /* Mobile top nav */
        .mobile-header {
            display: none;
            position: sticky;
            top: 0;
            z-index: 200;
            background: #fff;
            border-bottom: 1px solid var(--border);
            height: 60px;
            align-items: center;
            padding: 0 16px;
            justify-content: space-between;
        }
        .mobile-header .brand-logo {
            font-size: 18px;
        }
        .hamburger {
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            transition: background var(--transition);
        }
        .hamburger:hover {
            background: var(--primary-light);
        }
        .hamburger svg {
            width: 26px;
            height: 26px;
            color: var(--text-primary);
        }
        .mobile-drawer {
            display: none;
            position: fixed;
            top: 60px;
            left: 0;
            right: 0;
            bottom: 0;
            background: #fff;
            z-index: 190;
            padding: 16px;
            overflow-y: auto;
            flex-direction: column;
            gap: 4px;
            border-top: 1px solid var(--border);
        }
        .mobile-drawer.open {
            display: flex;
        }
        .mobile-drawer a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 14px 16px;
            border-radius: 8px;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 15px;
            transition: background var(--transition);
        }
        .mobile-drawer a:hover,
        .mobile-drawer a.active {
            background: var(--primary-light);
            color: var(--primary);
        }
        .mobile-drawer .nav-icon {
            width: 20px;
            height: 20px;
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-secondary);
            transition: color var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: var(--text-light);
            font-size: 12px;
        }
        .breadcrumb .current {
            color: var(--primary);
            font-weight: 600;
        }

        /* Category header compact */
        .cat-header {
            background: linear-gradient(135deg, #FBFCFE 0%, #F0F4F8 100%);
            border-bottom: 1px solid var(--border);
            padding: 48px 0 40px;
        }
        .cat-header-inner {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
        }
        .cat-header-text {
            flex: 1;
            min-width: 0;
        }
        .cat-header h1 {
            font-size: 36px;
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .cat-header p {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
        }
        .cat-header-image {
            width: 180px;
            height: 120px;
            object-fit: cover;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
        }

        /* Knowledge list cards */
        .knowledge-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .knowledge-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .knowledge-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--border-strong);
        }
        .knowledge-thumb {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
        }
        .knowledge-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .knowledge-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 12px;
            flex-wrap: wrap;
        }
        .knowledge-date {
            font-size: 13px;
            color: var(--text-light);
        }
        .knowledge-title {
            font-size: 20px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-primary);
            margin-bottom: 10px;
        }
        .knowledge-desc {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
            margin-bottom: 16px;
        }
        .knowledge-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
        }
        .read-more {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            transition: all var(--transition);
        }
        .read-more:hover {
            color: var(--primary-dark);
            gap: 10px;
        }

        /* Popular ranking */
        .rank-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
            counter-reset: rank;
        }
        .rank-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 16px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            transition: all var(--transition);
        }
        .rank-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
        }
        .rank-number {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 16px;
            flex-shrink: 0;
        }
        .rank-item:nth-child(1) .rank-number {
            background: #FEF3E8;
            color: var(--accent-orange);
        }
        .rank-item:nth-child(2) .rank-number {
            background: #E8F5EE;
            color: var(--accent-green);
        }
        .rank-info {
            flex: 1;
            min-width: 0;
        }
        .rank-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.4;
        }
        .rank-views {
            font-size: 13px;
            color: var(--text-light);
            margin-top: 4px;
        }

        /* Tag cloud */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .tag-cloud .tag {
            font-size: 13px;
            padding: 8px 16px;
            cursor: default;
            transition: all var(--transition);
        }
        .tag-cloud .tag:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        /* Data highlight */
        .data-highlight-row {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .data-highlight-item {
            text-align: center;
            padding: 32px 20px;
            background: #fff;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .data-highlight-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .data-number {
            font-size: 40px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 8px;
        }
        .data-label {
            font-size: 15px;
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-strong);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            background: none;
            text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--primary-light);
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 20px;
            height: 20px;
            color: var(--primary);
            transition: transform var(--transition);
        }
        .faq-item.open .faq-icon {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
        }
        .faq-answer-inner {
            padding: 0 24px 20px;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.8;
        }

        /* Category entry */
        .cat-entry-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        .cat-entry-link {
            display: block;
            padding: 24px 20px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            text-align: center;
            transition: all var(--transition);
            color: var(--text-primary);
            font-weight: 600;
        }
        .cat-entry-link:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            color: var(--primary);
        }

        /* Footer */
        .footer {
            background: #1F2A37;
            color: #B8C4CE;
            padding: 50px 0 24px;
            margin-top: auto;
        }
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            justify-content: space-between;
            margin-bottom: 32px;
        }
        .footer-brand {
            flex: 1;
            min-width: 240px;
        }
        .footer-brand .brand-name {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: #B8C4CE;
            max-width: 360px;
        }
        .footer-links {
            min-width: 140px;
        }
        .footer-links h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-links a {
            display: block;
            color: #B8C4CE;
            font-size: 14px;
            margin-bottom: 10px;
            transition: color var(--transition);
        }
        .footer-links a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-size: 13px;
            color: #8B97A5;
        }
        .fixed-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .fixed-links a {
            color: #B8C4CE;
            transition: color var(--transition);
        }
        .fixed-links a:hover {
            color: #fff;
        }
        .divider {
            color: rgba(255,255,255,0.3);
        }

        /* Responsive */
        @media (max-width: 1199px) {
            .container {
                padding: 0 32px;
            }
            .knowledge-grid {
                gap: 20px;
            }
            .cat-entry-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 991px) {
            .container {
                padding: 0 24px;
            }
            .knowledge-grid {
                grid-template-columns: 1fr;
            }
            .data-highlight-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .cat-header h1 {
                font-size: 30px;
            }
        }
        @media (max-width: 767px) {
            body {
                font-size: 15px;
            }
            .sidebar {
                display: none;
            }
            .main-content {
                margin-left: 0;
            }
            .mobile-header {
                display: flex;
            }
            .mobile-drawer {
                display: none;
            }
            .mobile-drawer.open {
                display: flex;
            }
            .container {
                padding: 0 16px;
            }
            .section {
                padding: 56px 0;
            }
            .section-title {
                font-size: 24px;
            }
            .cat-header {
                padding: 32px 0 28px;
            }
            .cat-header h1 {
                font-size: 26px;
            }
            .cat-header-inner {
                flex-direction: column;
                align-items: flex-start;
            }
            .cat-header-image {
                width: 100%;
                height: 180px;
                object-fit: cover;
            }
            .knowledge-thumb {
                height: 180px;
            }
            .data-highlight-row {
                grid-template-columns: 1fr;
            }
            .cat-entry-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .cat-entry-link {
                padding: 16px;
                font-size: 14px;
            }
            .footer-content {
                flex-direction: column;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }
        @media (max-width: 480px) {
            .cat-entry-grid {
                grid-template-columns: 1fr;
            }
            .knowledge-body {
                padding: 18px;
            }
            .knowledge-title {
                font-size: 18px;
            }
            .rank-item {
                padding: 12px;
            }
            .faq-question {
                padding: 16px 18px;
                font-size: 15px;
            }
        }

/* roulang page: category3 */
:root {
            --primary: #2F6B9E;
            --primary-dark: #24507A;
            --primary-light: #E8F0F7;
            --accent-green: #4C9F70;
            --accent-orange: #E08A3C;
            --bg: #F5F7FA;
            --card-bg: #FFFFFF;
            --text-primary: #1F2A37;
            --text-secondary: #5A6B7A;
            --text-light: #8A97A5;
            --border: #E6EBF0;
            --border-strong: #D0D7DE;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 2px 8px rgba(31, 42, 55, 0.05);
            --shadow-md: 0 8px 24px rgba(31, 42, 55, 0.06);
            --shadow-lg: 0 12px 32px rgba(31, 42, 55, 0.12);
            --transition: 0.2s ease;
            --nav-width: 260px;
            --content-max: 1200px;
            --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --spacing-section: 80px;
            --spacing-card: 24px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            outline: none;
            background: none;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 3px solid rgba(47, 107, 158, 0.35);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--content-max);
            margin: 0 auto;
            padding: 0 40px;
        }
        .section {
            padding: var(--spacing-section) 0;
        }
        .section-alt {
            background-color: var(--card-bg);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .section-header {
            margin-bottom: 40px;
        }
        .section-label {
            display: inline-block;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: 1.5px;
            text-transform: uppercase;
            margin-bottom: 10px;
        }
        .section-title {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            letter-spacing: 0.3px;
            transition: all var(--transition);
            min-height: 44px;
            text-align: center;
            white-space: nowrap;
        }
        .btn-primary {
            background-color: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(47, 107, 158, 0.25);
        }
        .btn-primary:hover {
            background-color: var(--primary-dark);
            box-shadow: 0 6px 20px rgba(47, 107, 158, 0.35);
            color: #fff;
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(47, 107, 158, 0.3);
        }
        .btn-secondary {
            background-color: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-secondary:hover {
            background-color: var(--primary-light);
            border-color: var(--primary-dark);
            color: var(--primary-dark);
            transform: translateY(-1px);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }
        .btn-accent {
            background-color: var(--accent-green);
            color: #fff;
            box-shadow: 0 4px 12px rgba(76, 159, 112, 0.25);
        }
        .btn-accent:hover {
            background-color: #3D8A5E;
            box-shadow: 0 6px 18px rgba(76, 159, 112, 0.35);
            color: #fff;
            transform: translateY(-1px);
        }
        .btn-sm {
            padding: 8px 16px;
            min-height: 38px;
            font-size: 14px;
        }
        .card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            padding: var(--spacing-card);
            transition: all var(--transition);
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--border-strong);
        }
        .tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.5px;
            background-color: var(--primary-light);
            color: var(--primary);
        }
        .tag-green {
            background-color: #E8F5EE;
            color: var(--accent-green);
        }
        .tag-orange {
            background-color: #FEF3E8;
            color: var(--accent-orange);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 700;
            background-color: var(--primary-light);
            color: var(--primary);
            letter-spacing: 0.5px;
        }
        .layout {
            display: flex;
            min-height: 100vh;
            width: 100%;
        }
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: #FBFCFE;
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            z-index: 50;
            overflow-y: auto;
        }
        .sidebar-brand {
            height: 72px;
            display: flex;
            align-items: center;
            padding: 0 24px;
            border-bottom: 1px solid var(--border);
            font-size: 20px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.5px;
        }
        .sidebar-brand .brand-logo-icon {
            width: 32px;
            height: 32px;
            background: var(--primary);
            border-radius: 8px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
            margin-right: 12px;
        }
        .sidebar-nav {
            flex: 1;
            display: flex;
            flex-direction: column;
            padding: 16px 12px;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 0 16px;
            height: 44px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            margin-bottom: 4px;
            position: relative;
            transition: all var(--transition);
        }
        .sidebar-nav a::before {
            content: "";
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 0;
            background: var(--primary);
            border-radius: 0 3px 3px 0;
            transition: height var(--transition);
        }
        .sidebar-nav a:hover {
            background-color: var(--primary-light);
            color: var(--primary-dark);
        }
        .sidebar-nav a.active {
            color: var(--primary);
            background-color: var(--primary-light);
            font-weight: 600;
        }
        .sidebar-nav a.active::before {
            height: 28px;
        }
        .nav-icon {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
        }
        .sidebar-tools {
            padding: 16px 24px;
            border-top: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .sidebar-tools a {
            font-size: 14px;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 8px;
            min-height: 44px;
        }
        .sidebar-tools a:hover {
            color: var(--primary);
        }
        .main-content {
            margin-left: var(--nav-width);
            flex: 1;
            min-width: 0;
            display: flex;
            flex-direction: column;
        }
        .mobile-header {
            display: none;
            position: sticky;
            top: 0;
            z-index: 60;
            background: #FBFCFE;
            border-bottom: 1px solid var(--border);
            padding: 0 20px;
            height: 64px;
            align-items: center;
            justify-content: space-between;
        }
        .mobile-header .brand-name {
            font-size: 18px;
            font-weight: 800;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .mobile-header .brand-logo-icon {
            width: 28px;
            height: 28px;
            background: var(--primary);
            border-radius: 6px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 14px;
        }
        .hamburger {
            width: 44px;
            height: 44px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 5px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            background: var(--card-bg);
            transition: background var(--transition);
        }
        .hamburger:hover {
            background: var(--primary-light);
        }
        .hamburger span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition);
        }
        .hamburger.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        .mobile-drawer {
            display: none;
            position: fixed;
            top: 64px;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(31, 42, 55, 0.45);
            z-index: 55;
        }
        .mobile-drawer.open {
            display: block;
        }
        .mobile-drawer nav {
            background: #FBFCFE;
            border-bottom: 1px solid var(--border);
            padding: 12px 20px 20px;
            display: flex;
            flex-direction: column;
        }
        .mobile-drawer nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 0 12px;
            height: 48px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition);
        }
        .mobile-drawer nav a:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
        }
        .mobile-drawer nav a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .mobile-drawer .nav-icon {
            width: 20px;
            height: 20px;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--primary);
        }
        .breadcrumb span {
            color: var(--text-light);
        }
        .page-hero {
            padding: 40px 0 8px;
        }
        .page-hero h1 {
            font-size: 38px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 16px;
        }
        .page-hero .section-desc {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 780px;
            line-height: 1.8;
        }
        .invite-hero {
            background: linear-gradient(135deg, rgba(47, 107, 158, 0.06) 0%, rgba(47, 107, 158, 0.12) 100%);
            border: 1px solid rgba(47, 107, 158, 0.15);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            margin: 32px 0 40px;
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            align-items: stretch;
        }
        .invite-hero-left {
            flex: 1 1 400px;
        }
        .invite-hero-left h2 {
            font-size: 26px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .invite-hero-left p {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 20px;
        }
        .invite-rewards {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-bottom: 24px;
        }
        .invite-rewards li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 15px;
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.7);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 12px 16px;
        }
        .invite-rewards .reward-icon {
            width: 24px;
            height: 24px;
            flex-shrink: 0;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        .invite-hero-right {
            flex: 1 1 300px;
            background: var(--card-bg);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            padding: 24px;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .progress-label {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 12px;
            font-size: 15px;
            color: var(--text-secondary);
        }
        .progress-label strong {
            color: var(--text-primary);
            font-size: 18px;
        }
        .progress-bar {
            height: 12px;
            background: var(--border);
            border-radius: 20px;
            overflow: hidden;
            margin-bottom: 16px;
        }
        .progress-bar-fill {
            height: 100%;
            background: var(--accent-green);
            border-radius: 20px;
            width: 40%;
            transition: width var(--transition);
        }
        .progress-status {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .invite-actions {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .archive-section {
            padding: 48px 0;
        }
        .team-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 24px;
            margin-top: 32px;
        }
        .team-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .team-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--border-strong);
        }
        .team-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
        }
        .team-card-body {
            padding: 20px 20px 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .team-card-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 8px;
            gap: 12px;
        }
        .team-card-header h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
        }
        .team-meta {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 12px;
            font-weight: 500;
        }
        .team-desc {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
            flex: 1;
        }
        .team-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 16px;
        }
        .rank-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 16px;
            margin-top: 24px;
        }
        .rank-list li {
            display: flex;
            align-items: center;
            gap: 16px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 16px 20px;
            transition: all var(--transition);
        }
        .rank-list li:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
            border-color: var(--border-strong);
        }
        .rank-num {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 16px;
            flex-shrink: 0;
        }
        .rank-list li:nth-child(1) .rank-num {
            background: #FEF3E8;
            color: var(--accent-orange);
        }
        .rank-info {
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .rank-info strong {
            font-size: 16px;
            color: var(--text-primary);
        }
        .rank-info small {
            font-size: 13px;
            color: var(--text-secondary);
        }
        .rank-trend {
            font-size: 14px;
            font-weight: 600;
            color: var(--accent-green);
        }
        .data-cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 24px;
            margin-top: 32px;
        }
        .data-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .data-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .data-card strong {
            font-size: 32px;
            font-weight: 700;
            color: var(--primary);
            display: block;
            margin-bottom: 8px;
            line-height: 1.2;
        }
        .data-card span {
            font-size: 14px;
            color: var(--text-secondary);
            font-weight: 500;
        }
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 24px;
        }
        .tag-cloud .tag {
            font-size: 14px;
            padding: 8px 18px;
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 24px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            color: var(--text-secondary);
            transition: all var(--transition);
        }
        .tag-cloud .tag:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            border-color: var(--primary);
            transform: translateY(-1px);
        }
        .subscribe-cta {
            background: linear-gradient(135deg, #F0F6FB 0%, #E4EEF5 100%);
            border-radius: var(--radius-lg);
            padding: 40px 32px;
            text-align: center;
            margin-top: 40px;
        }
        .subscribe-cta h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .subscribe-cta p {
            font-size: 16px;
            color: var(--text-secondary);
            margin-bottom: 24px;
            line-height: 1.8;
        }
        .subscribe-form {
            display: flex;
            max-width: 520px;
            margin: 0 auto;
            gap: 12px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .subscribe-form input[type="email"] {
            flex: 1 1 260px;
            height: 48px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-strong);
            padding: 0 16px;
            font-size: 15px;
            color: var(--text-primary);
            background: var(--card-bg);
            transition: all var(--transition);
            min-width: 0;
        }
        .subscribe-form input[type="email"]:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(47, 107, 158, 0.15);
            outline: none;
        }
        .subscribe-form .btn {
            min-width: 120px;
            height: 48px;
        }
        .faq-section {
            padding: 56px 0;
        }
        .faq {
            display: flex;
            flex-direction: column;
            gap: 16px;
            margin-top: 24px;
        }
        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-md);
        }
        .faq-item summary {
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            min-height: 48px;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: "+";
            font-size: 22px;
            color: var(--primary);
            transition: transform var(--transition);
            flex-shrink: 0;
            line-height: 1;
        }
        .faq-item[open] summary::after {
            transform: rotate(45deg);
        }
        .faq-answer {
            padding: 0 24px 20px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        .footer {
            background: #1F2A37;
            color: #C8D1DB;
            padding: 48px 0 24px;
            margin-top: 40px;
        }
        .footer .container {
            max-width: var(--content-max);
        }
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-brand {
            flex: 1 1 300px;
        }
        .footer-brand .brand-name {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-brand p {
            font-size: 14px;
            color: #A8B4C0;
            line-height: 1.8;
            max-width: 340px;
        }
        .footer-links {
            flex: 1 1 160px;
        }
        .footer-links h4 {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .footer-links a {
            display: block;
            color: #A8B4C0;
            font-size: 14px;
            padding: 6px 0;
            transition: color var(--transition);
        }
        .footer-links a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: #A8B4C0;
        }
        .fixed-links {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .fixed-links a {
            color: #A8B4C0;
        }
        .fixed-links a:hover {
            color: #fff;
        }
        .divider {
            color: rgba(255, 255, 255, 0.3);
        }
        @media (max-width: 1199px) {
            .container {
                padding: 0 32px;
            }
            .section {
                padding: 64px 0;
            }
            .page-hero h1 {
                font-size: 34px;
            }
        }
        @media (max-width: 991px) {
            .sidebar {
                width: 220px;
            }
            .main-content {
                margin-left: 220px;
            }
            .container {
                padding: 0 24px;
            }
            .invite-hero {
                padding: 28px 24px;
                gap: 24px;
            }
            .invite-hero-left h2 {
                font-size: 23px;
            }
            .page-hero h1 {
                font-size: 30px;
            }
        }
        @media (max-width: 767px) {
            .layout {
                display: block;
            }
            .sidebar {
                display: none;
            }
            .mobile-header {
                display: flex;
            }
            .main-content {
                margin-left: 0;
            }
            .container {
                padding: 0 16px;
            }
            .section {
                padding: 48px 0;
            }
            .page-hero {
                padding: 28px 0 0;
            }
            .page-hero h1 {
                font-size: 26px;
            }
            .section-title {
                font-size: 24px;
            }
            .invite-hero {
                flex-direction: column;
                padding: 24px 20px;
                margin: 24px 0 32px;
                gap: 20px;
            }
            .invite-hero-left h2 {
                font-size: 22px;
            }
            .invite-hero-right {
                padding: 20px;
            }
            .invite-actions {
                flex-direction: column;
            }
            .team-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .team-card img {
                height: 160px;
            }
            .data-cards-grid {
                grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
                gap: 16px;
            }
            .data-card strong {
                font-size: 26px;
            }
            .subscribe-cta {
                padding: 28px 20px;
            }
            .subscribe-form {
                flex-direction: column;
            }
            .subscribe-form input[type="email"] {
                flex: 1 1 auto;
                width: 100%;
            }
            .subscribe-form .btn {
                width: 100%;
            }
            .faq-item summary {
                padding: 16px 18px;
                font-size: 15px;
            }
            .faq-answer {
                padding: 0 18px 16px;
                font-size: 14px;
            }
            .footer {
                padding: 40px 0 20px;
                margin-top: 24px;
            }
            .footer-content {
                flex-direction: column;
                gap: 28px;
            }
            .footer-links {
                flex: 1 1 auto;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 14px;
            }
            .section {
                padding: 40px 0;
            }
            .page-hero h1 {
                font-size: 23px;
            }
            .invite-hero {
                padding: 20px 16px;
                border-radius: var(--radius-md);
            }
            .invite-hero-left h2 {
                font-size: 20px;
            }
            .invite-actions .btn {
                width: 100%;
            }
            .team-card-body {
                padding: 16px 16px 20px;
            }
            .rank-list li {
                padding: 12px 14px;
                gap: 10px;
            }
            .rank-num {
                width: 30px;
                height: 30px;
                font-size: 14px;
            }
            .data-card {
                padding: 18px 12px;
            }
            .data-card strong {
                font-size: 24px;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #2F6B9E;
            --primary-dark: #24507A;
            --primary-light: #E8F0F7;
            --accent-green: #4C9F70;
            --accent-orange: #E08A3C;
            --bg: #F5F7FA;
            --card-bg: #FFFFFF;
            --text-primary: #1F2A37;
            --text-secondary: #5A6B7A;
            --text-light: #8A97A5;
            --border: #E6EBF0;
            --border-strong: #D0D7DE;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 2px 8px rgba(31, 42, 55, 0.05);
            --shadow-md: 0 8px 24px rgba(31, 42, 55, 0.06);
            --shadow-lg: 0 12px 32px rgba(31, 42, 55, 0.12);
            --transition: 0.2s ease;
            --nav-width: 260px;
            --content-max: 1200px;
            --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --spacing-section: 64px;
            --spacing-card: 20px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg);
            min-height: 100vh;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover {
            color: var(--primary-dark);
        }

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

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

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

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 3px solid rgba(47, 107, 158, 0.35);
            outline-offset: 2px;
        }

        /* Layout wrapper */
        .site-wrapper {
            display: flex;
            min-height: 100vh;
            width: 100%;
        }

        /* Sidebar navigation */
        .sidebar {
            width: var(--nav-width);
            background-color: #FBFCFE;
            border-right: 1px solid var(--border);
            height: 100vh;
            position: fixed;
            top: 0;
            left: 0;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            flex-shrink: 0;
            transition: transform var(--transition);
        }

        .sidebar-brand {
            height: 72px;
            display: flex;
            align-items: center;
            padding: 0 24px;
            border-bottom: 1px solid var(--border);
            flex-shrink: 0;
        }

        .brand-name {
            font-size: 20px;
            font-weight: 800;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 8px;
            letter-spacing: 0.5px;
        }

        .brand-name .brand-icon {
            width: 32px;
            height: 32px;
            background: var(--primary);
            border-radius: 8px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
            font-weight: 800;
            flex-shrink: 0;
        }

        .sidebar-nav {
            flex: 1;
            overflow-y: auto;
            padding: 20px 12px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 16px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            min-height: 44px;
            position: relative;
        }

        .sidebar-nav a:hover {
            background-color: var(--primary-light);
            color: var(--primary-dark);
        }

        .sidebar-nav a.active {
            background-color: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
        }

        .sidebar-nav a.active::before {
            content: '';
            position: absolute;
            left: -12px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 28px;
            background-color: var(--primary);
            border-radius: 0 3px 3px 0;
        }

        .nav-icon {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
        }

        .sidebar-tools {
            padding: 16px 24px 20px;
            border-top: 1px solid var(--border);
            flex-shrink: 0;
        }

        .sidebar-tools a {
            font-size: 13px;
            color: var(--text-light);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 0;
            transition: color var(--transition);
        }

        .sidebar-tools a:hover {
            color: var(--primary);
        }

        .sidebar-tools .tool-divider {
            color: var(--border-strong);
            margin: 0 8px;
        }

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

        .container {
            max-width: var(--content-max);
            margin: 0 auto;
            padding: 0 40px;
            width: 100%;
        }

        .section {
            padding: var(--spacing-section) 0;
        }

        .section-alt {
            background-color: var(--card-bg);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .section-header {
            margin-bottom: 32px;
        }

        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: 1.5px;
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        .section-title {
            font-size: 26px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            letter-spacing: 0.3px;
            transition: all var(--transition);
            min-height: 44px;
            text-align: center;
            white-space: nowrap;
        }

        .btn-primary {
            background-color: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(47, 107, 158, 0.25);
        }

        .btn-primary:hover {
            background-color: var(--primary-dark);
            box-shadow: 0 6px 20px rgba(47, 107, 158, 0.35);
            color: #fff;
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(47, 107, 158, 0.3);
        }

        .btn-secondary {
            background-color: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

        .btn-secondary:hover {
            background-color: var(--primary-light);
            border-color: var(--primary-dark);
            color: var(--primary-dark);
            transform: translateY(-1px);
        }

        .btn-secondary:active {
            transform: translateY(0);
        }

        .btn-accent {
            background-color: var(--accent-green);
            color: #fff;
            box-shadow: 0 4px 12px rgba(76, 159, 112, 0.25);
        }

        .btn-accent:hover {
            background-color: #3D8A5E;
            box-shadow: 0 6px 18px rgba(76, 159, 112, 0.35);
            color: #fff;
            transform: translateY(-1px);
        }

        .card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            padding: var(--spacing-card);
            transition: all var(--transition);
        }

        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--border-strong);
        }

        .tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.5px;
            background-color: var(--primary-light);
            color: var(--primary);
        }

        .tag-green {
            background-color: #E8F5EE;
            color: var(--accent-green);
        }

        .tag-orange {
            background-color: #FEF3E8;
            color: var(--accent-orange);
        }

        /* Breadcrumb */
        .breadcrumb {
            padding: 24px 0 0 0;
            margin-bottom: 16px;
            font-size: 14px;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--text-light);
        }

        .breadcrumb a:hover {
            color: var(--primary);
        }

        .breadcrumb .separator {
            color: var(--border-strong);
            font-size: 12px;
        }

        .breadcrumb .current {
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* Page header compact */
        .page-header {
            padding: 20px 0 32px 0;
            border-bottom: 1px solid var(--border);
        }

        .page-header h1 {
            font-size: 34px;
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }

        .page-header .page-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 760px;
            line-height: 1.8;
        }

        /* Timeline card layout */
        .timeline-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .timeline-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            overflow: hidden;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

        .timeline-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--border-strong);
        }

        .timeline-card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
        }

        .timeline-card-body {
            padding: 20px 24px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .timeline-card-meta {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
            flex-wrap: wrap;
        }

        .timeline-card-date {
            font-size: 13px;
            color: var(--text-light);
            font-weight: 500;
        }

        .timeline-card-title {
            font-size: 18px;
            font-weight: 700;
            line-height: 1.5;
            color: var(--text-primary);
            margin-bottom: 10px;
        }

        .timeline-card-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
            flex: 1;
        }

        .timeline-card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            flex-wrap: wrap;
        }

        .btn-sm {
            padding: 8px 18px;
            font-size: 13px;
            min-height: 38px;
            border-radius: 6px;
        }

        /* Hot ranking */
        .ranking-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .ranking-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 14px 18px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }

        .ranking-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--border-strong);
            transform: translateX(3px);
        }

        .ranking-num {
            width: 32px;
            height: 32px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 15px;
            flex-shrink: 0;
        }

        .ranking-num.top1 {
            background: var(--accent-orange);
            color: #fff;
        }

        .ranking-num.top2 {
            background: #8A97A5;
            color: #fff;
        }

        .ranking-num.top3 {
            background: #C0824A;
            color: #fff;
        }

        .ranking-info {
            flex: 1;
        }

        .ranking-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 2px;
        }

        .ranking-meta {
            font-size: 13px;
            color: var(--text-light);
        }

        .ranking-badge {
            flex-shrink: 0;
        }

        /* Data cards */
        .data-card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .data-stat-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 20px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }

        .data-stat-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .data-stat-value {
            font-size: 32px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 4px;
            line-height: 1.2;
        }

        .data-stat-label {
            font-size: 14px;
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* CTA section */
        .cta-section {
            background: var(--primary);
            border-radius: var(--radius-lg);
            padding: 48px 40px;
            text-align: center;
        }

        .cta-section h2 {
            color: #fff;
            font-size: 26px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .cta-section p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 16px;
            margin-bottom: 28px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-section .btn-white {
            background-color: #fff;
            color: var(--primary);
            font-weight: 700;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
        }

        .cta-section .btn-white:hover {
            background-color: var(--primary-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }

        .cta-section .btn-outline-white {
            background-color: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.6);
            font-weight: 600;
        }

        .cta-section .btn-outline-white:hover {
            background-color: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            transform: translateY(-2px);
        }

        /* FAQ */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition);
        }

        .faq-item:hover {
            border-color: var(--border-strong);
            box-shadow: var(--shadow-md);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            text-align: left;
            background: none;
            min-height: 56px;
        }

        .faq-question:hover {
            color: var(--primary);
        }

        .faq-arrow {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            transition: transform 0.25s ease;
            color: var(--text-light);
        }

        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            padding: 0 24px;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        .faq-answer p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* Other categories entry */
        .category-entry-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        .category-entry-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 20px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            display: block;
            color: var(--text-primary);
        }

        .category-entry-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: var(--primary);
            color: var(--primary);
        }

        .category-entry-item .cat-icon {
            font-size: 28px;
            margin-bottom: 8px;
        }

        .category-entry-item .cat-name {
            font-size: 15px;
            font-weight: 600;
        }

        /* Footer */
        .footer {
            background-color: #1F2A37;
            color: #B8C4D0;
            margin-top: auto;
            padding: 48px 0 24px;
        }

        .footer .container {
            padding: 0 40px;
        }

        .footer-content {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }

        .footer-brand .brand-name {
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 14px;
            color: #9AABB9;
            line-height: 1.8;
            max-width: 400px;
        }

        .footer-links h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer-links a {
            display: block;
            font-size: 14px;
            color: #B8C4D0;
            padding: 6px 0;
            transition: color var(--transition);
        }

        .footer-links a:hover {
            color: #fff;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 13px;
            color: #8A97A5;
        }

        .footer-bottom .fixed-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-bottom .fixed-links a {
            color: #B8C4D0;
        }

        .footer-bottom .fixed-links a:hover {
            color: #fff;
        }

        .footer-bottom .divider {
            color: rgba(255, 255, 255, 0.2);
        }

        /* Mobile header */
        .mobile-header {
            display: none;
            background: #fff;
            border-bottom: 1px solid var(--border);
            padding: 0 16px;
            height: 60px;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 900;
        }

        .mobile-header .brand-name {
            font-size: 18px;
            font-weight: 800;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .mobile-header .brand-icon {
            width: 28px;
            height: 28px;
            background: var(--primary);
            border-radius: 6px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 14px;
            flex-shrink: 0;
        }

        .hamburger-btn {
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: var(--primary-light);
            color: var(--primary);
            transition: all var(--transition);
        }

        .hamburger-btn:hover {
            background: var(--primary);
            color: #fff;
        }

        .hamburger-icon {
            width: 22px;
            height: 22px;
        }

        .mobile-menu-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(31, 42, 55, 0.5);
            z-index: 950;
            opacity: 0;
            transition: opacity 0.2s ease;
        }

        .mobile-menu-overlay.active {
            opacity: 1;
        }

        /* Responsive */
        @media (max-width: 991px) {
            .data-card-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .category-entry-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .timeline-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 767px) {
            .sidebar {
                transform: translateX(-100%);
                position: fixed;
                top: 0;
                left: 0;
                bottom: 0;
                height: 100vh;
                z-index: 960;
                box-shadow: 4px 0 24px rgba(31, 42, 55, 0.15);
                transition: transform 0.25s ease;
            }

            .sidebar.open {
                transform: translateX(0);
            }

            .mobile-header {
                display: flex;
            }

            .mobile-menu-overlay {
                display: block;
                pointer-events: none;
            }

            .mobile-menu-overlay.active {
                pointer-events: auto;
            }

            .main-content {
                margin-left: 0;
            }

            .container {
                padding: 0 16px;
            }

            .section {
                padding: 48px 0;
            }

            .page-header h1 {
                font-size: 28px;
            }

            .data-card-grid {
                grid-template-columns: 1fr;
            }

            .category-entry-grid {
                grid-template-columns: 1fr 1fr;
            }

            .footer-content {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .footer .container {
                padding: 0 16px;
            }

            .cta-section {
                padding: 32px 20px;
            }

            .cta-section h2 {
                font-size: 22px;
            }

            .timeline-card-body {
                padding: 16px 18px 20px;
            }
        }

        @media (max-width: 520px) {
            .category-entry-grid {
                grid-template-columns: 1fr;
            }

            .ranking-item {
                flex-wrap: wrap;
            }

            .page-header h1 {
                font-size: 24px;
            }

            .section-title {
                font-size: 22px;
            }
        }

/* roulang page: category4 */
:root {
            --primary: #2F6B9E;
            --primary-dark: #24507A;
            --primary-light: #E8F0F7;
            --accent-green: #4C9F70;
            --accent-orange: #E08A3C;
            --bg: #F5F7FA;
            --card-bg: #FFFFFF;
            --text-primary: #1F2A37;
            --text-secondary: #5A6B7A;
            --text-light: #8A97A5;
            --border: #E6EBF0;
            --border-strong: #D0D7DE;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 2px 8px rgba(31, 42, 55, 0.05);
            --shadow-md: 0 8px 24px rgba(31, 42, 55, 0.06);
            --shadow-lg: 0 12px 32px rgba(31, 42, 55, 0.12);
            --transition: 0.2s ease;
            --nav-width: 260px;
            --content-max: 1200px;
            --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --spacing-section: 80px;
            --spacing-card: 24px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            margin: 0;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover {
            color: var(--primary-dark);
        }

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

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

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

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 3px solid rgba(47, 107, 158, 0.35);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--content-max);
            margin: 0 auto;
            padding: 0 40px;
        }

        .section {
            padding: var(--spacing-section) 0;
        }

        .section-alt {
            background-color: var(--card-bg);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .section-sm {
            padding: 48px 0;
        }

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

        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: 1.5px;
            text-transform: uppercase;
            margin-bottom: 10px;
        }

        .section-title {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            letter-spacing: 0.3px;
            transition: all var(--transition);
            min-height: 44px;
            text-align: center;
            white-space: nowrap;
        }

        .btn-primary {
            background-color: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(47, 107, 158, 0.25);
        }

        .btn-primary:hover {
            background-color: var(--primary-dark);
            box-shadow: 0 6px 20px rgba(47, 107, 158, 0.35);
            color: #fff;
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(47, 107, 158, 0.3);
        }

        .btn-secondary {
            background-color: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

        .btn-secondary:hover {
            background-color: var(--primary-light);
            border-color: var(--primary-dark);
            color: var(--primary-dark);
            transform: translateY(-1px);
        }

        .btn-secondary:active {
            transform: translateY(0);
        }

        .btn-accent {
            background-color: var(--accent-green);
            color: #fff;
            box-shadow: 0 4px 12px rgba(76, 159, 112, 0.25);
        }

        .btn-accent:hover {
            background-color: #3D8A5E;
            box-shadow: 0 6px 18px rgba(76, 159, 112, 0.35);
            color: #fff;
            transform: translateY(-1px);
        }

        .card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            padding: var(--spacing-card);
            transition: all var(--transition);
        }

        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--border-strong);
        }

        .tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.5px;
            background-color: var(--primary-light);
            color: var(--primary);
        }

        .tag-green {
            background-color: #E8F5EE;
            color: var(--accent-green);
        }

        .tag-orange {
            background-color: #FEF3E8;
            color: var(--accent-orange);
        }

        /* ========== 左侧竖向导航 ========== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: var(--nav-width);
            background-color: #FBFCFE;
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform 0.3s ease;
        }

        .sidebar-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            height: 72px;
            padding: 0 24px;
            border-bottom: 1px solid var(--border);
            flex-shrink: 0;
        }

        .sidebar-logo .logo-icon {
            width: 32px;
            height: 32px;
            background: var(--primary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
            font-weight: 800;
            flex-shrink: 0;
        }

        .sidebar-logo .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            overflow-y: auto;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            min-height: 44px;
            position: relative;
        }

        .sidebar-nav a::before {
            content: '';
            position: absolute;
            left: -12px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 0;
            background-color: var(--primary);
            border-radius: 0 3px 3px 0;
            transition: height var(--transition);
        }

        .sidebar-nav a:hover {
            background-color: var(--primary-light);
            color: var(--primary-dark);
        }

        .sidebar-nav a.active {
            background-color: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
        }

        .sidebar-nav a.active::before {
            height: 24px;
        }

        .nav-icon {
            width: 18px;
            height: 18px;
            flex-shrink: 0;
        }

        .sidebar-bottom {
            padding: 16px 24px;
            border-top: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            gap: 8px;
            flex-shrink: 0;
        }

        .sidebar-bottom a {
            font-size: 13px;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 8px;
            transition: color var(--transition);
            min-height: 36px;
        }

        .sidebar-bottom a:hover {
            color: var(--primary);
        }

        .sidebar-bottom .tiny-icon {
            width: 14px;
            height: 14px;
            flex-shrink: 0;
        }

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

        .main-content {
            flex: 1;
        }

        /* ========== 移动端顶部导航 ========== */
        .mobile-topbar {
            display: none;
            position: sticky;
            top: 0;
            z-index: 999;
            background-color: #FBFCFE;
            border-bottom: 1px solid var(--border);
            padding: 0 16px;
            height: 60px;
            align-items: center;
            justify-content: space-between;
        }

        .mobile-topbar .brand-name {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .mobile-topbar .brand-name .logo-icon-mobile {
            width: 28px;
            height: 28px;
            background: var(--primary);
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 14px;
            font-weight: 800;
        }

        .hamburger-btn {
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            gap: 5px;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            transition: background-color var(--transition);
        }

        .hamburger-btn:hover {
            background-color: var(--primary-light);
        }

        .hamburger-btn span {
            display: block;
            width: 22px;
            height: 2px;
            background-color: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition);
        }

        .hamburger-btn.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .hamburger-btn.active span:nth-child(2) {
            opacity: 0;
        }

        .hamburger-btn.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(31, 42, 55, 0.5);
            z-index: 998;
            opacity: 0;
            transition: opacity var(--transition);
        }

        .mobile-overlay.active {
            display: block;
            opacity: 1;
        }

        /* ========== 面包屑 ========== */
        .breadcrumb-bar {
            padding: 24px 0 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-light);
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--text-secondary);
            transition: color var(--transition);
        }

        .breadcrumb a:hover {
            color: var(--primary);
        }

        .breadcrumb .separator {
            color: var(--border-strong);
            user-select: none;
        }

        .breadcrumb .current {
            color: var(--primary);
            font-weight: 600;
        }

        /* ========== 分类页标题区 ========== */
        .category-hero {
            padding: 40px 0 32px;
            background-color: var(--bg);
        }

        .category-hero .hero-title-row {
            display: flex;
            align-items: flex-start;
            gap: 32px;
            flex-wrap: wrap;
        }

        .category-hero .hero-text {
            flex: 1;
            min-width: 280px;
        }

        .category-hero h1 {
            font-size: 36px;
            font-weight: 700;
            line-height: 1.35;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .category-hero .hero-desc {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 680px;
        }

        .category-hero .hero-stat-card {
            flex-shrink: 0;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            padding: 24px 28px;
            min-width: 220px;
            text-align: center;
        }

        .category-hero .stat-number {
            font-size: 40px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }

        .category-hero .stat-label {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 6px;
        }

        /* ========== 知识条目列表 ========== */
        .knowledge-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
        }

        .knowledge-card {
            display: flex;
            flex-direction: column;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            overflow: hidden;
            transition: all var(--transition);
        }

        .knowledge-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--border-strong);
        }

        .knowledge-card .card-image {
            width: 100%;
            height: 220px;
            overflow: hidden;
            flex-shrink: 0;
            background-color: var(--primary-light);
        }

        .knowledge-card .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
            transition: transform 0.4s ease;
        }

        .knowledge-card:hover .card-image img {
            transform: scale(1.04);
        }

        .knowledge-card .card-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .knowledge-card .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 12px;
            flex-wrap: wrap;
        }

        .knowledge-card .card-date {
            font-size: 13px;
            color: var(--text-light);
        }

        .knowledge-card .card-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.5;
            margin-bottom: 10px;
        }

        .knowledge-card .card-summary {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
            margin-bottom: 16px;
        }

        .knowledge-card .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition);
        }

        .knowledge-card .card-link:hover {
            color: var(--primary-dark);
            gap: 10px;
        }

        .card-link .arrow {
            transition: transform var(--transition);
        }

        .knowledge-card .card-link:hover .arrow {
            transform: translateX(3px);
        }

        /* ========== 支撑板块：热门排行 + 标签云侧栏 ========== */
        .support-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 28px;
        }

        .support-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: 28px;
        }

        .support-card .support-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--primary-light);
        }

        .rank-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .rank-list li {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            font-size: 14px;
            line-height: 1.6;
        }

        .rank-list .rank-number {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            font-weight: 700;
            background: var(--primary-light);
            color: var(--primary);
            margin-top: 2px;
        }

        .rank-list .rank-number.top1 {
            background: var(--accent-orange);
            color: #fff;
        }

        .rank-list .rank-number.top2 {
            background: var(--primary);
            color: #fff;
        }

        .rank-list .rank-number.top3 {
            background: var(--accent-green);
            color: #fff;
        }

        .rank-list .rank-text {
            color: var(--text-secondary);
        }

        .rank-list .rank-text strong {
            color: var(--text-primary);
            font-weight: 600;
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .tag-cloud .tag {
            font-size: 13px;
            padding: 6px 16px;
            cursor: default;
            transition: all var(--transition);
        }

        .tag-cloud .tag:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-1px);
        }

        .data-mini-cards {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .data-mini-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 14px 16px;
            background: var(--bg);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }

        .data-mini-item:hover {
            border-color: var(--border-strong);
            background: var(--primary-light);
        }

        .data-mini-item .mini-label {
            font-size: 14px;
            color: var(--text-secondary);
            font-weight: 500;
        }

        .data-mini-item .mini-value {
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
            white-space: nowrap;
        }

        /* ========== 订阅CTA ========== */
        .subscribe-cta {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            border-radius: var(--radius-lg);
            padding: 48px 40px;
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
            box-shadow: 0 12px 32px rgba(47, 107, 158, 0.25);
        }

        .subscribe-cta .cta-text {
            flex: 1;
            min-width: 260px;
        }

        .subscribe-cta .cta-text h3 {
            font-size: 26px;
            font-weight: 700;
            margin-bottom: 10px;
            color: #fff;
        }

        .subscribe-cta .cta-text p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.7;
        }

        .subscribe-cta .cta-form {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            align-items: center;
        }

        .subscribe-cta input[type="email"] {
            height: 44px;
            padding: 0 16px;
            border-radius: var(--radius-sm);
            border: 1px solid rgba(255, 255, 255, 0.3);
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            font-size: 15px;
            min-width: 240px;
            transition: all var(--transition);
        }

        .subscribe-cta input[type="email"]::placeholder {
            color: rgba(255, 255, 255, 0.6);
        }

        .subscribe-cta input[type="email"]:focus {
            outline: none;
            border-color: #fff;
            background: rgba(255, 255, 255, 0.2);
            box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.25);
        }

        .subscribe-cta .btn-white {
            background: #fff;
            color: var(--primary);
            font-weight: 700;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }

        .subscribe-cta .btn-white:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
        }

        /* ========== FAQ ========== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            max-width: 820px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: all var(--transition);
        }

        .faq-item:hover {
            border-color: var(--border-strong);
            box-shadow: var(--shadow-md);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 22px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            user-select: none;
            min-height: 44px;
            transition: background-color var(--transition);
            text-align: left;
            width: 100%;
        }

        .faq-question:hover {
            background-color: var(--primary-light);
        }

        .faq-question .faq-arrow {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            transition: transform 0.3s ease;
            color: var(--text-light);
        }

        .faq-item.open .faq-question .faq-arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.8;
            padding: 0 22px;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 22px 20px;
        }

        /* ========== 页脚 ========== */
        .footer {
            background-color: #1F2A37;
            color: #B8C4D0;
            padding: 48px 0 28px;
            margin-top: 0;
        }

        .footer .container {
            max-width: var(--content-max);
        }

        .footer-content {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }

        .footer-brand .brand-name {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: #8A97A5;
            max-width: 360px;
        }

        .footer-links h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }

        .footer-links a {
            display: block;
            font-size: 14px;
            color: #8A97A5;
            margin-bottom: 10px;
            transition: color var(--transition);
            min-height: 22px;
        }

        .footer-links a:hover {
            color: #fff;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 13px;
            color: #6B7A88;
        }

        .footer-bottom .fixed-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-bottom .fixed-links a {
            color: #8A97A5;
            transition: color var(--transition);
            min-height: 22px;
            display: inline-flex;
            align-items: center;
        }

        .footer-bottom .fixed-links a:hover {
            color: #fff;
        }

        .footer-bottom .divider {
            color: #4A5A68;
            user-select: none;
        }

        /* ========== 响应式 ========== */
        @media (min-width: 1200px) {
            .knowledge-grid {
                grid-template-columns: 1fr 1fr;
            }
            .support-grid {
                grid-template-columns: 1fr 1fr 1fr;
            }
        }

        @media (min-width: 992px) and (max-width: 1199px) {
            .knowledge-grid {
                grid-template-columns: 1fr 1fr;
                gap: 22px;
            }
            .support-grid {
                grid-template-columns: 1fr 1fr;
                gap: 22px;
            }
            .container {
                padding: 0 32px;
            }
            .category-hero h1 {
                font-size: 32px;
            }
        }

        @media (min-width: 768px) and (max-width: 991px) {
            .sidebar {
                width: 220px;
            }
            .main-wrapper {
                margin-left: 220px;
            }
            :root {
                --nav-width: 220px;
            }
            .knowledge-grid {
                grid-template-columns: 1fr;
                gap: 22px;
            }
            .support-grid {
                grid-template-columns: 1fr 1fr;
                gap: 22px;
            }
            .container {
                padding: 0 28px;
            }
            .category-hero h1 {
                font-size: 30px;
            }
            .category-hero .hero-stat-card {
                min-width: 180px;
            }
            .category-hero .stat-number {
                font-size: 32px;
            }
            .subscribe-cta {
                padding: 36px 28px;
                flex-direction: column;
                text-align: center;
            }
            .subscribe-cta .cta-form {
                justify-content: center;
            }
            .footer-content {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .section {
                padding: 60px 0;
            }
        }

        @media (max-width: 767px) {
            .sidebar {
                transform: translateX(-100%);
                width: var(--nav-width);
                box-shadow: var(--shadow-lg);
            }
            .sidebar.active {
                transform: translateX(0);
            }
            .main-wrapper {
                margin-left: 0;
            }
            .mobile-topbar {
                display: flex;
            }
            .mobile-overlay.active {
                display: block;
                opacity: 1;
            }
            .container {
                padding: 0 16px;
            }
            .section {
                padding: 48px 0;
            }
            .section-sm {
                padding: 36px 0;
            }
            .section-title {
                font-size: 24px;
            }
            .category-hero {
                padding: 28px 0 24px;
            }
            .category-hero h1 {
                font-size: 26px;
            }
            .category-hero .hero-desc {
                font-size: 15px;
            }
            .category-hero .hero-title-row {
                flex-direction: column;
                gap: 20px;
            }
            .category-hero .hero-stat-card {
                width: 100%;
                min-width: auto;
                display: flex;
                align-items: center;
                justify-content: center;
                gap: 16px;
                padding: 16px 20px;
            }
            .category-hero .stat-number {
                font-size: 32px;
            }
            .knowledge-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .knowledge-card .card-image {
                height: 180px;
            }
            .knowledge-card .card-body {
                padding: 18px;
            }
            .support-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .support-card {
                padding: 20px;
            }
            .subscribe-cta {
                padding: 32px 20px;
                flex-direction: column;
                text-align: center;
                gap: 20px;
            }
            .subscribe-cta .cta-form {
                flex-direction: column;
                width: 100%;
            }
            .subscribe-cta input[type="email"] {
                min-width: auto;
                width: 100%;
            }
            .subscribe-cta .btn-white {
                width: 100%;
            }
            .breadcrumb-bar {
                padding: 16px 0 0;
            }
            .faq-question {
                font-size: 15px;
                padding: 16px 18px;
            }
            .faq-answer {
                font-size: 14px;
                padding: 0 18px;
            }
            .faq-item.open .faq-answer {
                padding: 0 18px 16px;
            }
            .footer {
                padding: 36px 0 20px;
            }
            .footer-content {
                grid-template-columns: 1fr;
                gap: 24px;
                margin-bottom: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (max-width: 400px) {
            .knowledge-card .card-image {
                height: 150px;
            }
            .knowledge-card .card-title {
                font-size: 16px;
            }
            .category-hero h1 {
                font-size: 22px;
            }
            .btn {
                padding: 10px 20px;
                font-size: 14px;
            }
        }

/* roulang page: category5 */
:root {
            --primary: #2F6B9E;
            --primary-dark: #24507A;
            --primary-light: #E8F0F7;
            --accent-green: #4C9F70;
            --accent-orange: #E08A3C;
            --bg: #F5F7FA;
            --card-bg: #FFFFFF;
            --text-primary: #1F2A37;
            --text-secondary: #5A6B7A;
            --text-light: #8A97A5;
            --border: #E6EBF0;
            --border-strong: #D0D7DE;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 2px 8px rgba(31, 42, 55, 0.05);
            --shadow-md: 0 8px 24px rgba(31, 42, 55, 0.06);
            --shadow-lg: 0 12px 32px rgba(31, 42, 55, 0.12);
            --transition: 0.2s ease;
            --nav-width: 260px;
            --content-max: 1200px;
            --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --spacing-section: 80px;
            --spacing-card: 24px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover {
            color: var(--primary-dark);
        }

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

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

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

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 3px solid rgba(47, 107, 158, 0.35);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--content-max);
            margin: 0 auto;
            padding: 0 40px;
        }

        .section {
            padding: var(--spacing-section) 0;
        }

        .section-alt {
            background-color: var(--card-bg);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .section-header {
            margin-bottom: 40px;
        }

        .section-label {
            display: inline-block;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: 1.5px;
            text-transform: uppercase;
            margin-bottom: 10px;
        }

        .section-title {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            letter-spacing: 0.3px;
            transition: all var(--transition);
            min-height: 44px;
            text-align: center;
            white-space: nowrap;
        }

        .btn-primary {
            background-color: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(47, 107, 158, 0.25);
        }

        .btn-primary:hover {
            background-color: var(--primary-dark);
            box-shadow: 0 6px 20px rgba(47, 107, 158, 0.35);
            color: #fff;
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(47, 107, 158, 0.3);
        }

        .btn-secondary {
            background-color: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

        .btn-secondary:hover {
            background-color: var(--primary-light);
            border-color: var(--primary-dark);
            color: var(--primary-dark);
            transform: translateY(-1px);
        }

        .btn-secondary:active {
            transform: translateY(0);
        }

        .btn-accent {
            background-color: var(--accent-green);
            color: #fff;
            box-shadow: 0 4px 12px rgba(76, 159, 112, 0.25);
        }

        .btn-accent:hover {
            background-color: #3D8A5E;
            box-shadow: 0 6px 18px rgba(76, 159, 112, 0.35);
            color: #fff;
            transform: translateY(-1px);
        }

        .card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            padding: var(--spacing-card);
            transition: all var(--transition);
        }

        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--border-strong);
        }

        .tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.5px;
            background-color: var(--primary-light);
            color: var(--primary);
        }

        .tag-green {
            background-color: #E8F5EE;
            color: var(--accent-green);
        }

        .tag-orange {
            background-color: #FEF3E8;
            color: var(--accent-orange);
        }

        .badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 3px 10px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 700;
            background-color: var(--primary);
            color: #fff;
            letter-spacing: 0.3px;
            min-height: 24px;
        }

        .badge-green {
            background-color: var(--accent-green);
        }

        .badge-orange {
            background-color: var(--accent-orange);
        }

        .layout-wrapper {
            display: flex;
            min-height: 100vh;
        }

        .sidebar-nav {
            width: var(--nav-width);
            background-color: #FBFCFE;
            border-right: 1px solid var(--border);
            position: fixed;
            top: 0;
            left: 0;
            height: 100vh;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            padding: 24px 16px;
            overflow-y: auto;
            transition: transform 0.25s ease;
        }

        .sidebar-brand {
            height: 72px;
            display: flex;
            align-items: center;
            padding: 0 8px 16px;
            border-bottom: 1px solid var(--border);
            margin-bottom: 20px;
        }

        .brand-name {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .brand-name .logo-icon {
            width: 32px;
            height: 32px;
            background: var(--primary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
            font-weight: 800;
            flex-shrink: 0;
        }

        .sidebar-nav-links {
            display: flex;
            flex-direction: column;
            gap: 4px;
            flex: 1;
        }

        .sidebar-nav-links a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 0 12px;
            height: 44px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            border-left: 3px solid transparent;
            white-space: nowrap;
        }

        .sidebar-nav-links a:hover {
            background-color: var(--primary-light);
            color: var(--primary);
            border-left-color: var(--primary-light);
        }

        .sidebar-nav-links a.active {
            background-color: var(--primary-light);
            color: var(--primary);
            border-left-color: var(--primary);
            font-weight: 600;
        }

        .nav-icon {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
        }

        .sidebar-bottom {
            border-top: 1px solid var(--border);
            padding-top: 16px;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .sidebar-bottom a {
            font-size: 13px;
            color: var(--text-light);
            padding: 4px 8px;
            border-radius: 4px;
            transition: all var(--transition);
        }

        .sidebar-bottom a:hover {
            color: var(--primary);
            background-color: var(--primary-light);
        }

        .main-content {
            margin-left: var(--nav-width);
            flex: 1;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background-color: var(--card-bg);
            border-bottom: 1px solid var(--border);
            padding: 12px 16px;
            align-items: center;
            justify-content: space-between;
            box-shadow: var(--shadow-sm);
        }

        .mobile-header .brand-name {
            font-size: 18px;
        }

        .hamburger-btn {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background-color: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            transition: all var(--transition);
            flex-shrink: 0;
        }

        .hamburger-btn:hover {
            background-color: var(--primary);
            color: #fff;
        }

        .hamburger-btn svg {
            width: 22px;
            height: 22px;
        }

        .mobile-menu-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: rgba(31, 42, 55, 0.5);
            z-index: 998;
            opacity: 0;
            transition: opacity 0.25s ease;
        }

        .mobile-menu-overlay.open {
            opacity: 1;
            pointer-events: auto;
        }

        .page-top {
            background-color: var(--card-bg);
            border-bottom: 1px solid var(--border);
            padding: 32px 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--text-secondary);
            transition: color var(--transition);
        }

        .breadcrumb a:hover {
            color: var(--primary);
        }

        .breadcrumb .separator {
            color: var(--border-strong);
            user-select: none;
        }

        .breadcrumb .current {
            color: var(--primary);
            font-weight: 600;
        }

        .page-title {
            font-size: 36px;
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 10px;
            letter-spacing: 0.5px;
        }

        .page-subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.8;
        }

        .community-list-section {
            padding: 48px 0;
        }

        .community-list-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 24px;
            flex-wrap: wrap;
            gap: 12px;
        }

        .community-list-header h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .community-count {
            font-size: 14px;
            color: var(--text-secondary);
            background-color: var(--card-bg);
            border: 1px solid var(--border);
            padding: 6px 16px;
            border-radius: 20px;
        }

        .discussion-card {
            display: flex;
            gap: 20px;
            padding: 22px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            margin-bottom: 16px;
            position: relative;
        }

        .discussion-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
            border-color: var(--border-strong);
        }

        .discussion-avatar {
            flex-shrink: 0;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            overflow: hidden;
            background-color: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 700;
            color: var(--primary);
            border: 2px solid var(--border);
        }

        .discussion-avatar img {
            border-radius: 50%;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .discussion-body {
            flex: 1;
            min-width: 0;
        }

        .discussion-meta {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            color: var(--text-light);
            margin-bottom: 6px;
            flex-wrap: wrap;
        }

        .discussion-author {
            font-weight: 600;
            color: var(--text-primary);
        }

        .discussion-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.5;
            transition: color var(--transition);
        }

        .discussion-card:hover .discussion-title {
            color: var(--primary);
        }

        .discussion-excerpt {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 12px;
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
        }

        .discussion-footer {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-light);
            flex-wrap: wrap;
        }

        .discussion-stat {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .discussion-stat svg {
            width: 14px;
            height: 14px;
        }

        .discussion-tags {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }

        .discussion-rank {
            position: absolute;
            top: 20px;
            right: 20px;
            font-size: 13px;
            font-weight: 700;
            color: var(--text-light);
        }

        .sidebar-widgets {
            display: grid;
            grid-template-columns: 1fr;
            gap: 24px;
            margin-top: 40px;
        }

        .widget-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-sm);
        }

        .widget-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .hot-list {
            list-style: none;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .hot-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 8px 10px;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
        }

        .hot-list li:hover {
            background-color: var(--primary-light);
        }

        .hot-number {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background-color: var(--primary-light);
            color: var(--primary);
            font-size: 12px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .hot-number.top {
            background-color: var(--accent-orange);
            color: #fff;
        }

        .hot-text {
            font-size: 14px;
            color: var(--text-secondary);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .tag-cloud .tag {
            cursor: pointer;
            transition: all var(--transition);
            font-size: 13px;
            padding: 6px 14px;
            border: 1px solid transparent;
        }

        .tag-cloud .tag:hover {
            background-color: var(--primary);
            color: #fff;
            transform: translateY(-1px);
        }

        .stat-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 12px;
        }

        .stat-item {
            text-align: center;
            padding: 16px 8px;
            background-color: var(--bg);
            border-radius: var(--radius-sm);
        }

        .stat-number {
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 2px;
        }

        .stat-label {
            font-size: 12px;
            color: var(--text-secondary);
        }

        .cta-section {
            background-color: var(--primary-light);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
            padding: 64px 0;
        }

        .cta-content {
            text-align: center;
            max-width: 640px;
            margin: 0 auto;
        }

        .cta-content h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .cta-content p {
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 24px;
        }

        .faq-section {
            padding: 64px 0;
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 18px 22px;
            background: transparent;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            text-align: left;
            min-height: 44px;
            transition: all var(--transition);
        }

        .faq-question:hover {
            background-color: var(--primary-light);
        }

        .faq-arrow {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            transition: transform 0.25s ease;
            color: var(--text-light);
        }

        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            padding: 0 22px;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 22px 18px;
        }

        .faq-answer p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .footer {
            background-color: #1F2A37;
            color: #B8C4CE;
            padding: 48px 0 24px;
            margin-top: auto;
        }

        .footer-content {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }

        .footer-brand .brand-name {
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            max-width: 340px;
            color: #9AAAB8;
        }

        .footer-links h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
        }

        .footer-links a {
            display: block;
            font-size: 14px;
            color: #9AAAB8;
            margin-bottom: 8px;
            transition: all var(--transition);
        }

        .footer-links a:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 13px;
            color: #7A8A98;
            flex-wrap: wrap;
            gap: 12px;
        }

        .fixed-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .fixed-links a {
            color: #7A8A98;
            font-size: 13px;
            transition: all var(--transition);
        }

        .fixed-links a:hover {
            color: #fff;
        }

        .divider {
            color: #4A5A68;
        }

        @media (max-width: 1199px) {
            .container {
                padding: 0 32px;
            }
            .stat-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (max-width: 991px) {
            .container {
                padding: 0 24px;
            }
            .section {
                padding: 56px 0;
            }
            .footer-content {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .stat-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 8px;
            }
        }

        @media (max-width: 767px) {
            .sidebar-nav {
                transform: translateX(-100%);
                width: 280px;
            }

            .sidebar-nav.open {
                transform: translateX(0);
                box-shadow: var(--shadow-lg);
            }

            .main-content {
                margin-left: 0;
                padding-top: 64px;
            }

            .mobile-header {
                display: flex;
            }

            .mobile-menu-overlay {
                display: block;
                pointer-events: none;
            }

            .mobile-menu-overlay.open {
                pointer-events: auto;
            }

            .container {
                padding: 0 16px;
            }

            .section {
                padding: 44px 0;
            }

            .page-top {
                padding: 20px 0;
            }

            .page-title {
                font-size: 26px;
            }

            .page-subtitle {
                font-size: 14px;
            }

            .community-list-section {
                padding: 32px 0;
            }

            .discussion-card {
                padding: 16px;
                gap: 14px;
            }

            .discussion-avatar {
                width: 40px;
                height: 40px;
                font-size: 16px;
            }

            .discussion-title {
                font-size: 16px;
            }

            .discussion-excerpt {
                font-size: 14px;
            }

            .discussion-rank {
                position: static;
                font-size: 13px;
                font-weight: 700;
                color: var(--text-light);
                display: inline-block;
                margin-left: auto;
            }

            .discussion-card {
                flex-wrap: wrap;
                align-items: flex-start;
            }

            .discussion-avatar {
                margin-bottom: 4px;
            }

            .widget-card {
                padding: 18px;
            }

            .stat-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 6px;
            }

            .stat-number {
                font-size: 18px;
            }

            .stat-label {
                font-size: 11px;
            }

            .cta-section {
                padding: 44px 0;
            }

            .cta-content h2 {
                font-size: 22px;
            }

            .faq-section {
                padding: 44px 0;
            }

            .faq-question {
                padding: 14px 16px;
                font-size: 15px;
            }

            .faq-answer p {
                font-size: 14px;
            }

            .footer-content {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (max-width: 520px) {
            .page-title {
                font-size: 22px;
            }

            .section-desc {
                font-size: 14px;
            }

            .discussion-card {
                padding: 14px;
            }

            .discussion-title {
                font-size: 15px;
            }

            .discussion-excerpt {
                font-size: 13px;
            }

            .discussion-footer {
                gap: 10px;
                font-size: 12px;
            }

            .community-list-header h2 {
                font-size: 18px;
            }

            .stat-grid {
                grid-template-columns: 1fr;
                gap: 8px;
            }
        }