/* roulang page: index */
:root {
            --primary: #2B6CB0;
            --primary-dark: #1A365D;
            --primary-light: #EBF4FF;
            --bg: #F7FAFC;
            --surface: #FFFFFF;
            --ink: #1A202C;
            --muted: #4A5568;
            --border: #E2E8F0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 2px 8px rgba(43, 108, 176, 0.05);
            --shadow-md: 0 8px 24px rgba(43, 108, 176, 0.08);
            --shadow-lg: 0 16px 32px rgba(43, 108, 176, 0.16);
            --spacing-section: 72px;
            --spacing-card: 24px;
            --max-width: 1180px;
            --font-zh: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            --font-en: "Inter", "Segoe UI", sans-serif;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-zh);
            background: var(--bg);
            color: var(--ink);
            line-height: 1.8;
            font-size: 16px;
            min-height: 100vh;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color .2s ease, background .2s ease, box-shadow .2s ease, transform .2s ease, opacity .2s ease;
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            display: block;
            max-width: 100%;
            height: auto;
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        :focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 12px rgba(26, 32, 44, 0.04);
        }
        .brand-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0;
            gap: 16px;
        }
        .logo a {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo a:hover {
            color: var(--primary);
        }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--primary);
            color: #fff;
            border-radius: 10px;
            font-size: 18px;
            font-weight: 700;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav a {
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--muted);
            white-space: nowrap;
            transition: all .2s ease;
        }
        .main-nav a:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
        }
        .main-nav a.active {
            background: var(--primary);
            color: #fff;
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .chip-nav-bar {
            background: var(--primary-light);
            padding: 8px 0;
            border-top: 1px solid rgba(43, 108, 176, 0.08);
        }
        .chip-nav {
            display: flex;
            gap: 8px;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            -ms-overflow-style: none;
            padding: 2px 0;
        }
        .chip-nav::-webkit-scrollbar {
            display: none;
        }
        .chip-nav a {
            flex: 0 0 auto;
            padding: 6px 16px;
            background: var(--surface);
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            color: var(--muted);
            border: 1px solid var(--border);
            transition: all .2s ease;
            white-space: nowrap;
        }
        .chip-nav a:hover {
            background: #fff;
            border-color: var(--primary);
            color: var(--primary);
        }
        .chip-nav a.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: all .25s ease;
            border: none;
            text-align: center;
            gap: 8px;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(43, 108, 176, 0.28);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            box-shadow: 0 8px 20px rgba(43, 108, 176, 0.35);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(43, 108, 176, 0.25);
        }
        .btn-secondary {
            background: var(--surface);
            color: var(--primary);
            border: 2px solid var(--primary);
            box-shadow: none;
        }
        .btn-secondary:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-1px);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }
        .btn-sm {
            padding: 8px 16px;
            font-size: 14px;
            border-radius: 999px;
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 16px;
            border-radius: var(--radius-lg);
        }
        /* Sections */
        .section {
            padding: var(--spacing-section) 0;
        }
        .section-alt {
            background: var(--surface);
        }
        .section-deep {
            background: var(--primary-dark);
            color: #fff;
        }
        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 40px;
        }
        .section-header h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }
        .section-header p {
            font-size: 16px;
            color: var(--muted);
            line-height: 1.8;
        }
        .section-header .section-tag {
            display: inline-block;
            padding: 4px 14px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            border-radius: 999px;
            margin-bottom: 12px;
            letter-spacing: 2px;
        }
        /* Cards */
        .card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border);
            padding: var(--spacing-card);
            transition: all .3s ease;
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: rgba(43, 108, 176, 0.2);
        }
        .card-title {
            font-size: 18px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 10px;
        }
        .card-text {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.7;
        }
        /* Hero */
        .hero {
            position: relative;
            overflow: hidden;
            background: linear-gradient(135deg, #fff 0%, var(--primary-light) 100%);
            padding: 60px 0 80px;
        }
        .hero-inner {
            display: grid;
            grid-template-columns: 1fr 420px;
            gap: 48px;
            align-items: center;
            position: relative;
            z-index: 2;
        }
        .hero-tag {
            display: inline-block;
            padding: 6px 16px;
            background: var(--primary);
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            border-radius: 999px;
            letter-spacing: 1px;
            margin-bottom: 16px;
        }
        .hero h1 {
            font-size: 38px;
            font-weight: 700;
            color: var(--primary-dark);
            line-height: 1.3;
            margin-bottom: 20px;
            letter-spacing: 0.5px;
        }
        .hero-desc {
            font-size: 16px;
            color: var(--muted);
            line-height: 1.9;
            margin-bottom: 28px;
            max-width: 540px;
        }
        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            margin-bottom: 24px;
        }
        .hero-data-row {
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
        }
        .hero-data-item {
            font-size: 14px;
            color: var(--muted);
        }
        .hero-data-item strong {
            display: block;
            font-size: 22px;
            color: var(--primary-dark);
            font-weight: 700;
        }
        .hero-coupon-wall {
            position: relative;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .main-coupon {
            background: var(--surface);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-lg);
            border: 2px solid var(--primary);
            overflow: hidden;
            transition: transform .3s ease;
        }
        .main-coupon:hover {
            transform: translateY(-4px);
        }
        .main-coupon-top {
            background: var(--primary);
            color: #fff;
            padding: 12px 20px;
            font-weight: 600;
            font-size: 14px;
            letter-spacing: 1px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .main-coupon-body {
            display: flex;
        }
        .main-coupon-info {
            flex: 1;
            padding: 20px;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .main-coupon-info h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--primary-dark);
        }
        .main-coupon-info p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.6;
        }
        .main-coupon-info .coupon-tag {
            display: inline-block;
            padding: 2px 10px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 12px;
            border-radius: 999px;
            width: fit-content;
        }
        .main-coupon-stub {
            border-left: 2px dashed var(--border);
            padding: 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            min-width: 96px;
            gap: 8px;
            background: #fafcff;
        }
        .main-coupon-stub .stub-label {
            font-size: 12px;
            color: var(--muted);
        }
        .main-coupon-stub .stub-value {
            font-size: 22px;
            font-weight: 700;
            color: var(--primary);
        }
        .mini-coupons {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .mini-coupon {
            flex: 1;
            min-width: 120px;
            background: var(--surface);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            padding: 14px 16px;
            text-align: center;
            transition: all .25s ease;
        }
        .mini-coupon:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary);
        }
        .mini-coupon .mc-title {
            font-size: 14px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 4px;
        }
        .mini-coupon .mc-desc {
            font-size: 12px;
            color: var(--muted);
        }
        /* Ticker */
        .ticker-section {
            background: var(--primary-dark);
            padding: 12px 0;
            overflow: hidden;
        }
        .ticker-wrap {
            display: flex;
            align-items: center;
            gap: 14px;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }
        .ticker-wrap::-webkit-scrollbar {
            display: none;
        }
        .ticker-label {
            flex: 0 0 auto;
            background: var(--primary);
            color: #fff;
            padding: 4px 14px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1px;
        }
        .ticker-item {
            flex: 0 0 auto;
            color: #fff;
            font-size: 14px;
            padding: 4px 18px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 999px;
            white-space: nowrap;
            transition: background .2s ease;
            cursor: pointer;
        }
        .ticker-item:hover {
            background: rgba(255, 255, 255, 0.18);
        }
        /* Stats */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-card {
            text-align: center;
            padding: 28px 16px;
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            transition: all .3s ease;
        }
        .stat-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .stat-number {
            font-size: 36px;
            font-weight: 700;
            color: var(--primary);
            font-family: var(--font-en);
            margin-bottom: 6px;
        }
        .stat-label {
            font-size: 14px;
            color: var(--muted);
        }
        /* Process */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .process-step {
            text-align: center;
            padding: 24px 18px;
        }
        .step-number {
            width: 48px;
            height: 48px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 14px;
            font-family: var(--font-en);
        }
        /* Timeline */
        .timeline-list {
            position: relative;
            max-width: 720px;
            margin: 0 auto;
            padding-left: 28px;
        }
        .timeline-list::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--border);
        }
        .timeline-item {
            position: relative;
            padding-bottom: 28px;
            padding-left: 20px;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -26px;
            top: 8px;
            width: 12px;
            height: 12px;
            background: var(--primary);
            border-radius: 50%;
            box-shadow: 0 0 0 4px var(--primary-light);
        }
        .timeline-item h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 4px;
        }
        .timeline-item p {
            font-size: 14px;
            color: var(--muted);
        }
        /* Partners */
        .partner-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            align-items: center;
            justify-content: center;
        }
        .partner-logo {
            padding: 16px 28px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            font-size: 16px;
            font-weight: 600;
            color: var(--muted);
            transition: all .25s ease;
            cursor: default;
            letter-spacing: 1px;
        }
        .partner-logo:hover {
            border-color: var(--primary);
            color: var(--primary);
            box-shadow: var(--shadow-sm);
        }
        /* Reviews */
        .review-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .review-card {
            padding: 24px;
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            transition: all .3s ease;
        }
        .review-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .review-stars {
            color: #f6ad55;
            letter-spacing: 2px;
            margin-bottom: 10px;
            font-size: 16px;
        }
        .review-text {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.7;
            margin-bottom: 14px;
        }
        .review-author {
            font-size: 14px;
            font-weight: 600;
            color: var(--ink);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .review-author::before {
            content: '';
            width: 28px;
            height: 28px;
            background: var(--primary-light);
            border-radius: 50%;
            display: inline-block;
        }
        /* FAQ */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            overflow: hidden;
        }
        .faq-question {
            padding: 18px 22px;
            font-weight: 600;
            color: var(--primary-dark);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 16px;
            transition: all .2s ease;
            background: #fff;
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-question:hover {
            background: var(--primary-light);
        }
        .faq-answer {
            padding: 0 22px 18px;
            font-size: 14px;
            color: var(--muted);
            line-height: 1.8;
            background: var(--primary-light);
            border-top: 1px solid var(--border);
        }
        /* Guarantee */
        .guarantee-bar {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
            padding: 32px 24px;
            background: var(--primary);
            border-radius: var(--radius-lg);
            color: #fff;
        }
        .guarantee-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 15px;
            font-weight: 500;
        }
        .guarantee-item span {
            font-size: 24px;
        }
        /* Contact/CTA */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: start;
        }
        .contact-form {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .contact-form input,
        .contact-form textarea {
            padding: 12px 16px;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            font-size: 14px;
            background: #fff;
            transition: all .25s ease;
            width: 100%;
        }
        .contact-form input:focus,
        .contact-form textarea:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(43, 108, 176, 0.15);
            outline: none;
        }
        .contact-form textarea {
            min-height: 120px;
            resize: vertical;
        }
        .contact-info-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 14px 0;
            border-bottom: 1px solid var(--border);
            font-size: 15px;
            color: var(--muted);
        }
        .contact-info-item span {
            font-size: 20px;
            flex-shrink: 0;
        }
        /* Footer */
        .site-footer {
            background: var(--ink);
            color: #a0aec0;
            padding: 56px 0 28px;
            font-size: 14px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 36px;
        }
        .footer-brand h4 {
            color: #fff;
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: #a0aec0;
        }
        .footer-col h5 {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 14px;
        }
        .footer-col a {
            display: block;
            color: #a0aec0;
            padding: 5px 0;
            font-size: 14px;
            transition: color .2s ease;
        }
        .footer-col a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
        }
        .footer-bottom a {
            color: #a0aec0;
        }
        .footer-bottom a:hover {
            color: #fff;
        }
        /* Tag / badge */
        .tag {
            display: inline-block;
            padding: 3px 12px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 500;
            background: var(--primary-light);
            color: var(--primary);
            white-space: nowrap;
        }
        .tag-outline {
            background: #fff;
            border: 1px solid var(--primary);
        }
        .tag-dark {
            background: var(--primary-dark);
            color: #fff;
        }
        /* News list */
        .news-item {
            display: flex;
            gap: 16px;
            padding: 16px 0;
            border-bottom: 1px solid var(--border);
            align-items: flex-start;
            transition: all .2s ease;
        }
        .news-item:hover {
            padding-left: 8px;
        }
        .news-item img {
            width: 120px;
            height: 80px;
            object-fit: cover;
            border-radius: var(--radius-sm);
            flex-shrink: 0;
        }
        .news-item-content {
            flex: 1;
        }
        .news-item-content h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 4px;
            line-height: 1.5;
        }
        .news-item-content p {
            font-size: 13px;
            color: var(--muted);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-meta {
            font-size: 12px;
            color: #a0aec0;
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-top: 6px;
        }
        /* Topic cards */
        .topic-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            padding: 24px;
            transition: all .3s ease;
        }
        .topic-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .topic-card h4 {
            font-size: 17px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 8px;
        }
        .topic-card p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.7;
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .hero-inner {
                grid-template-columns: 1fr 360px;
                gap: 32px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .review-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            :root {
                --spacing-section: 48px;
            }
            .brand-row {
                flex-wrap: wrap;
                gap: 10px;
            }
            .main-nav {
                order: 3;
                width: 100%;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                scrollbar-width: none;
                padding-bottom: 4px;
            }
            .main-nav::-webkit-scrollbar {
                display: none;
            }
            .main-nav a {
                flex: 0 0 auto;
                font-size: 14px;
                padding: 6px 12px;
            }
            .nav-cta {
                margin-left: auto;
            }
            .hero {
                padding: 40px 0 56px;
            }
            .hero-inner {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .hero h1 {
                font-size: 28px;
            }
            .hero-coupon-wall {
                order: -1;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-number {
                font-size: 28px;
            }
            .process-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .review-grid {
                grid-template-columns: 1fr;
            }
            .contact-grid {
                grid-template-columns: 1fr;
            }
            .guarantee-bar {
                gap: 20px;
                padding: 24px 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                justify-content: center;
            }
            .section-header h2 {
                font-size: 24px;
            }
            .news-item img {
                width: 80px;
                height: 60px;
            }
            .mini-coupons {
                flex-direction: column;
            }
        }
        @media (max-width: 520px) {
            .hero h1 {
                font-size: 24px;
                line-height: 1.4;
            }
            .hero-desc {
                font-size: 15px;
            }
            .btn-lg {
                padding: 12px 24px;
                font-size: 14px;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .main-coupon-body {
                flex-direction: column;
            }
            .main-coupon-stub {
                border-left: none;
                border-top: 2px dashed var(--border);
                padding: 14px;
                flex-direction: row;
                gap: 12px;
                min-width: auto;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .section-header h2 {
                font-size: 21px;
            }
        }
        /* Utility */
        .text-primary {
            color: var(--primary);
        }
        .text-dark {
            color: var(--primary-dark);
        }
        .bg-light {
            background: var(--primary-light);
        }
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        @media (max-width: 768px) {
            .grid-2, .grid-3, .grid-4 {
                grid-template-columns: 1fr;
            }
        }
        .mt-2 { margin-top: 8px; }
        .mt-4 { margin-top: 16px; }
        .mt-6 { margin-top: 24px; }
        .mb-4 { margin-bottom: 16px; }
        .mb-6 { margin-bottom: 24px; }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .gap-4 {
            gap: 16px;
        }
        .gap-6 {
            gap: 24px;
        }
        .hidden-desktop {
            display: none;
        }
        @media (max-width: 768px) {
            .hidden-desktop {
                display: block;
            }
        }
        /* Coupon specific decorative */
        .coupon-dashed {
            border-bottom: 2px dashed var(--border);
            margin: 10px 0;
        }
        .stamp {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 64px;
            height: 64px;
            border: 3px solid var(--primary);
            border-radius: 50%;
            color: var(--primary);
            font-weight: 700;
            font-size: 14px;
            transform: rotate(-12deg);
            letter-spacing: 2px;
            flex-shrink: 0;
        }

/* roulang page: category1 */
:root {
            --primary: #2B6CB0;
            --primary-dark: #1A365D;
            --primary-light: #EBF4FF;
            --bg: #F7FAFC;
            --surface: #FFFFFF;
            --ink: #1A202C;
            --muted: #4A5568;
            --border: #E2E8F0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 2px 8px rgba(43, 108, 176, 0.05);
            --shadow-md: 0 8px 24px rgba(43, 108, 176, 0.08);
            --shadow-lg: 0 16px 32px rgba(43, 108, 176, 0.16);
            --spacing-section: 72px;
            --spacing-card: 24px;
            --max-width: 1180px;
            --font-zh: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            --font-en: "Inter", "Segoe UI", sans-serif;
        }

        @media (max-width: 768px) {
            :root {
                --spacing-section: 48px;
            }
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-zh);
            background: var(--bg);
            color: var(--ink);
            line-height: 1.8;
            font-size: 16px;
            min-height: 100vh;
            margin: 0;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color .2s ease, background .2s ease, box-shadow .2s ease, transform .2s ease, opacity .2s ease;
        }

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

        img {
            display: block;
            max-width: 100%;
            height: auto;
        }

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

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 12px rgba(26, 32, 44, 0.04);
        }

        .brand-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0;
            gap: 16px;
            flex-wrap: wrap;
        }

        .logo a {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

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

        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--primary);
            color: #fff;
            border-radius: 10px;
            font-size: 18px;
            font-weight: 700;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: wrap;
        }

        .main-nav a {
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--muted);
            white-space: nowrap;
            transition: all .2s ease;
        }

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

        .main-nav a.active {
            background: var(--primary);
            color: #fff;
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .chip-nav-bar {
            background: var(--primary-light);
            padding: 8px 0;
            border-top: 1px solid rgba(43, 108, 176, 0.08);
        }

        .chip-nav {
            display: flex;
            gap: 8px;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            -ms-overflow-style: none;
            padding: 2px 0;
        }

        .chip-nav::-webkit-scrollbar {
            display: none;
        }

        .chip-nav a {
            flex: 0 0 auto;
            padding: 6px 16px;
            background: var(--surface);
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            color: var(--muted);
            border: 1px solid var(--border);
            transition: all .2s ease;
            white-space: nowrap;
        }

        .chip-nav a:hover {
            background: #fff;
            border-color: var(--primary);
            color: var(--primary);
        }

        .chip-nav a.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: all .25s ease;
            border: none;
            text-align: center;
            gap: 8px;
            white-space: nowrap;
            text-decoration: none;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(43, 108, 176, 0.28);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            box-shadow: 0 8px 20px rgba(43, 108, 176, 0.35);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(43, 108, 176, 0.25);
        }

        .btn-secondary {
            background: var(--surface);
            color: var(--primary);
            border: 2px solid var(--primary);
            box-shadow: none;
        }

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

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

        .btn-sm {
            padding: 8px 20px;
            font-size: 14px;
            border-radius: 10px;
        }

        .btn-lg {
            padding: 14px 36px;
            font-size: 16px;
            border-radius: var(--radius-md);
        }

        /* Category Hero - compact banner */
        .category-hero {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            color: #fff;
            padding: 52px 0 48px;
            position: relative;
            overflow: hidden;
        }

        .category-hero::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: rgba(255, 255, 255, 0.06);
            border-radius: 50%;
            pointer-events: none;
        }

        .category-hero::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: 20%;
            width: 300px;
            height: 300px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: 50%;
            pointer-events: none;
        }

        .category-hero .container {
            position: relative;
            z-index: 1;
        }

        .category-hero h1 {
            font-size: 38px;
            font-weight: 700;
            margin: 0 0 12px;
            letter-spacing: 1px;
            color: #fff;
            line-height: 1.3;
        }

        .category-hero .hero-desc {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.9);
            max-width: 680px;
            line-height: 1.8;
            margin: 0;
        }

        .category-hero .hero-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-top: 16px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
        }

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

        .section-title {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 8px;
            line-height: 1.35;
        }

        .section-subtitle {
            font-size: 16px;
            color: var(--muted);
            margin: 0 0 32px;
            line-height: 1.7;
        }

        .card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all .3s ease;
        }

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

        /* News List */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .news-item {
            display: flex;
            align-items: center;
            gap: 20px;
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 18px 20px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all .3s ease;
            cursor: pointer;
        }

        .news-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: rgba(43, 108, 176, 0.2);
        }

        .news-item-thumb {
            flex: 0 0 120px;
            width: 120px;
            height: 84px;
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--primary-light);
        }

        .news-item-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

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

        .news-item-body h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--ink);
            margin: 0 0 6px;
            line-height: 1.5;
        }

        .news-item-body p {
            font-size: 14px;
            color: var(--muted);
            margin: 0 0 8px;
            line-height: 1.7;
        }

        .news-item-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--muted);
        }

        .tag-badge {
            display: inline-block;
            padding: 2px 10px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 500;
            background: var(--primary-light);
            color: var(--primary);
            white-space: nowrap;
        }

        /* Featured cards */
        .featured-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .featured-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all .3s ease;
        }

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

        .featured-card-img {
            width: 100%;
            height: 200px;
            overflow: hidden;
            background: var(--primary-light);
        }

        .featured-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }

        .featured-card:hover .featured-card-img img {
            transform: scale(1.03);
        }

        .featured-card-body {
            padding: 20px 24px;
        }

        .featured-card-body h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--ink);
            margin: 0 0 8px;
            line-height: 1.5;
        }

        .featured-card-body p {
            font-size: 14px;
            color: var(--muted);
            margin: 0 0 12px;
            line-height: 1.7;
        }

        .featured-card-tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 500;
            background: var(--primary-light);
            color: var(--primary);
        }

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

        .tag-cloud .chip {
            padding: 8px 20px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            color: var(--muted);
            cursor: pointer;
            transition: all .25s ease;
            white-space: nowrap;
        }

        .tag-cloud .chip:hover {
            background: var(--primary-light);
            color: var(--primary);
            border-color: var(--primary);
        }

        .tag-cloud .chip.active-tag {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }

        /* Subscribe bar */
        .subscribe-bar {
            background: var(--primary-light);
            border-radius: var(--radius-lg);
            padding: 32px 36px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
            border: 1px solid rgba(43, 108, 176, 0.15);
        }

        .subscribe-bar-text {
            flex: 1;
            min-width: 240px;
        }

        .subscribe-bar-text h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--primary-dark);
            margin: 0 0 6px;
        }

        .subscribe-bar-text p {
            font-size: 14px;
            color: var(--muted);
            margin: 0;
        }

        .subscribe-form {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            align-items: center;
        }

        .subscribe-form input {
            padding: 10px 20px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            background: var(--surface);
            font-size: 14px;
            min-width: 240px;
            outline: none;
            transition: all .25s ease;
            color: var(--ink);
        }

        .subscribe-form input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(43, 108, 176, 0.15);
        }

        /* Quick links */
        .quick-links-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .quick-link-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 24px 28px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all .3s ease;
            display: block;
            text-decoration: none;
            color: var(--ink);
        }

        .quick-link-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: rgba(43, 108, 176, 0.25);
            color: var(--ink);
        }

        .quick-link-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--primary-dark);
            margin: 0 0 8px;
        }

        .quick-link-card p {
            font-size: 14px;
            color: var(--muted);
            margin: 0;
            line-height: 1.7;
        }

        /* CTA section */
        .cta-section {
            background: var(--primary-dark);
            color: #fff;
            text-align: center;
            padding: 56px 0;
        }

        .cta-section h2 {
            font-size: 28px;
            font-weight: 700;
            margin: 0 0 12px;
            color: #fff;
        }

        .cta-section p {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.85);
            margin: 0 0 24px;
        }

        .btn-white-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.7);
            padding: 12px 32px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: all .25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
        }

        .btn-white-outline:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            color: #fff;
            transform: translateY(-1px);
        }

        /* Footer */
        .site-footer {
            background: #1A202C;
            color: rgba(255, 255, 255, 0.8);
            padding: 56px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 40px;
        }

        .footer-brand h4 {
            font-size: 22px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 12px;
            letter-spacing: 1px;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.65);
            margin: 0;
        }

        .footer-col h5 {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin: 0 0 16px;
        }

        .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 10px;
            transition: color .2s ease;
            text-decoration: none;
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding: 20px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.55);
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.65);
            text-decoration: none;
            transition: color .2s ease;
        }

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

        /* Responsive */
        @media (max-width: 1024px) {
            .featured-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .quick-links-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 768px) {
            .brand-row {
                flex-direction: column;
                gap: 12px;
                padding: 12px 0;
            }
            .main-nav {
                width: 100%;
                justify-content: center;
                gap: 2px;
            }
            .main-nav a {
                padding: 6px 12px;
                font-size: 13px;
            }
            .nav-cta {
                width: 100%;
                justify-content: center;
            }
            .category-hero h1 {
                font-size: 30px;
            }
            .category-hero .hero-desc {
                font-size: 14px;
            }
            .news-item {
                flex-direction: column;
                align-items: flex-start;
                padding: 16px;
            }
            .news-item-thumb {
                flex: 0 0 auto;
                width: 100%;
                height: 160px;
            }
            .featured-grid {
                grid-template-columns: 1fr;
            }
            .quick-links-grid {
                grid-template-columns: 1fr;
            }
            .subscribe-bar {
                flex-direction: column;
                align-items: flex-start;
                padding: 24px 20px;
            }
            .subscribe-form {
                width: 100%;
            }
            .subscribe-form input {
                flex: 1;
                min-width: 0;
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }
            .section-title {
                font-size: 24px;
            }
        }

        @media (max-width: 520px) {
            .category-hero h1 {
                font-size: 26px;
            }
            .btn {
                padding: 10px 20px;
                font-size: 14px;
            }
            .btn-lg {
                padding: 12px 28px;
                font-size: 15px;
            }
            .news-item-body h3 {
                font-size: 15px;
            }
            .subscribe-bar-text h3 {
                font-size: 18px;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #2B6CB0;
            --primary-dark: #1A365D;
            --primary-light: #EBF4FF;
            --bg: #F7FAFC;
            --surface: #FFFFFF;
            --ink: #1A202C;
            --muted: #4A5568;
            --border: #E2E8F0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 2px 8px rgba(43, 108, 176, 0.05);
            --shadow-md: 0 8px 24px rgba(43, 108, 176, 0.08);
            --shadow-lg: 0 16px 32px rgba(43, 108, 176, 0.16);
            --spacing-section: 72px;
            --spacing-card: 24px;
            --max-width: 1180px;
            --font-zh: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            --font-en: "Inter", "Segoe UI", sans-serif;
        }
        @media (max-width: 768px) {
            :root {
                --spacing-section: 48px;
            }
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-zh);
            background: var(--bg);
            color: var(--ink);
            line-height: 1.8;
            font-size: 16px;
            min-height: 100vh;
            margin: 0;
        }
        * {
            box-sizing: border-box;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color .2s ease, background .2s ease, box-shadow .2s ease, transform .2s ease, opacity .2s ease, border-color .2s ease;
        }
        a:hover {
            color: var(--primary-dark);
        }
        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        img {
            display: block;
            max-width: 100%;
            height: auto;
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 12px rgba(26, 32, 44, 0.04);
        }
        .brand-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0;
            gap: 16px;
        }
        .logo a {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo a:hover {
            color: var(--primary);
        }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--primary);
            color: #fff;
            border-radius: 10px;
            font-size: 18px;
            font-weight: 700;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav a {
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--muted);
            white-space: nowrap;
            transition: all .2s ease;
        }
        .main-nav a:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
        }
        .main-nav a.active {
            background: var(--primary);
            color: #fff;
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .chip-nav-bar {
            background: var(--primary-light);
            padding: 8px 0;
            border-top: 1px solid rgba(43, 108, 176, 0.08);
        }
        .chip-nav {
            display: flex;
            gap: 8px;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            -ms-overflow-style: none;
            padding: 2px 0;
        }
        .chip-nav::-webkit-scrollbar {
            display: none;
        }
        .chip-nav a {
            flex: 0 0 auto;
            padding: 6px 16px;
            background: var(--surface);
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            color: var(--muted);
            border: 1px solid var(--border);
            transition: all .2s ease;
            white-space: nowrap;
        }
        .chip-nav a:hover {
            background: #fff;
            border-color: var(--primary);
            color: var(--primary);
        }
        .chip-nav a.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: all .25s ease;
            border: none;
            text-align: center;
            gap: 8px;
            white-space: nowrap;
            text-decoration: none;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(43, 108, 176, 0.28);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            box-shadow: 0 8px 20px rgba(43, 108, 176, 0.35);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(43, 108, 176, 0.25);
        }
        .btn-secondary {
            background: var(--surface);
            color: var(--primary);
            border: 2px solid var(--primary);
            box-shadow: none;
        }
        .btn-secondary:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-1px);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 14px;
            border-radius: 10px;
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 16px;
            border-radius: 14px;
        }
        /* Page Hero (compact for category) */
        .page-hero {
            background: linear-gradient(135deg, #1A365D 0%, #2B6CB0 60%, #3A7BC8 100%);
            color: #fff;
            padding: 48px 0 52px;
            position: relative;
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 20% 50%, rgba(255,255,255,0.08) 0%, transparent 60%),
                        radial-gradient(ellipse at 80% 20%, rgba(255,255,255,0.06) 0%, transparent 50%);
            pointer-events: none;
        }
        .page-hero .container {
            position: relative;
            z-index: 1;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255,255,255,0.75);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: rgba(255,255,255,0.8);
            transition: color .2s;
        }
        .breadcrumb a:hover {
            color: #fff;
        }
        .breadcrumb .sep {
            opacity: 0.6;
        }
        .page-hero h1 {
            font-size: clamp(26px, 3.2vw, 38px);
            font-weight: 700;
            line-height: 1.3;
            margin: 0 0 12px;
            letter-spacing: 0.5px;
        }
        .page-hero .hero-sub {
            font-size: 17px;
            color: rgba(255,255,255,0.85);
            max-width: 680px;
            line-height: 1.7;
            margin: 0;
        }
        .page-hero .hero-tags {
            display: flex;
            gap: 8px;
            margin-top: 16px;
            flex-wrap: wrap;
        }
        .page-hero .hero-tags span {
            padding: 4px 14px;
            background: rgba(255,255,255,0.15);
            border: 1px solid rgba(255,255,255,0.25);
            border-radius: 999px;
            font-size: 13px;
            color: #fff;
        }
        /* Section base */
        .section {
            padding: var(--spacing-section) 0;
        }
        .section-alt {
            background: var(--surface);
        }
        .section-light {
            background: var(--primary-light);
        }
        .section-title {
            font-size: clamp(22px, 2.8vw, 30px);
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 8px;
            line-height: 1.35;
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--muted);
            margin: 0 0 32px;
            max-width: 720px;
            line-height: 1.7;
        }
        .section-header {
            margin-bottom: 36px;
        }
        .section-header.center {
            text-align: center;
        }
        .section-header.center .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }
        /* Cards */
        .card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-md);
            padding: var(--spacing-card);
            transition: all .3s ease;
            position: relative;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(43, 108, 176, 0.25);
        }
        /* Data card grid */
        .data-card-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .data-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            padding: 24px 20px;
            transition: all .3s ease;
            display: flex;
            flex-direction: column;
            gap: 12px;
            position: relative;
            overflow: hidden;
        }
        .data-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), #5A9BD8);
            opacity: 0;
            transition: opacity .3s;
        }
        .data-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(43, 108, 176, 0.2);
        }
        .data-card:hover::after {
            opacity: 1;
        }
        .data-card-icon {
            width: 48px;
            height: 48px;
            background: var(--primary-light);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--primary);
            flex-shrink: 0;
        }
        .data-card h3 {
            font-size: 17px;
            font-weight: 600;
            margin: 0;
            color: var(--ink);
            line-height: 1.4;
        }
        .data-card p {
            font-size: 14px;
            color: var(--muted);
            margin: 0;
            line-height: 1.7;
            flex-grow: 1;
        }
        .data-card .card-tag {
            font-size: 12px;
            color: var(--primary);
            font-weight: 500;
            padding: 3px 10px;
            background: var(--primary-light);
            border-radius: 999px;
            align-self: flex-start;
        }
        /* Data sample table */
        .table-wrap {
            overflow-x: auto;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            background: var(--surface);
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
            min-width: 640px;
        }
        .data-table thead th {
            background: var(--primary-light);
            color: var(--primary-dark);
            font-weight: 600;
            padding: 14px 16px;
            text-align: left;
            border-bottom: 2px solid var(--border);
            font-size: 13px;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .data-table tbody td {
            padding: 12px 16px;
            border-bottom: 1px solid var(--border);
            color: var(--muted);
            font-size: 14px;
        }
        .data-table tbody tr:nth-child(even) {
            background: #FAFBFD;
        }
        .data-table tbody tr:hover {
            background: var(--primary-light);
        }
        .data-table tbody tr:last-child td {
            border-bottom: none;
        }
        .data-table .num {
            font-family: var(--font-en);
            font-variant-numeric: tabular-nums;
            font-weight: 500;
            color: var(--primary-dark);
        }
        .data-table .highlight {
            color: var(--primary);
            font-weight: 600;
        }
        /* Integration steps */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            counter-reset: step;
        }
        .step-item {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            padding: 28px 24px;
            position: relative;
            transition: all .3s;
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
            border-color: rgba(43, 108, 176, 0.2);
            transform: translateY(-2px);
        }
        .step-num {
            width: 44px;
            height: 44px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
            flex-shrink: 0;
        }
        .step-item h3 {
            font-size: 17px;
            font-weight: 600;
            margin: 0 0 8px;
            color: var(--ink);
        }
        .step-item p {
            font-size: 14px;
            color: var(--muted);
            margin: 0;
            line-height: 1.7;
        }
        /* Data sources */
        .sources-block {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            padding: 28px 32px;
            box-shadow: var(--shadow-sm);
        }
        .sources-list {
            list-style: none;
            padding: 0;
            margin: 0;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px 24px;
        }
        .sources-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 15px;
            color: var(--muted);
            line-height: 1.6;
        }
        .sources-list li::before {
            content: '●';
            color: var(--primary);
            font-size: 10px;
            margin-top: 6px;
            flex-shrink: 0;
        }
        /* FAQ accordion */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 820px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all .3s ease;
            box-shadow: var(--shadow-sm);
        }
        .faq-item:hover {
            border-color: rgba(43, 108, 176, 0.25);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            cursor: pointer;
            font-weight: 600;
            font-size: 16px;
            color: var(--primary-dark);
            background: var(--surface);
            transition: background .25s;
            gap: 16px;
            user-select: none;
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-question:hover {
            background: var(--primary-light);
        }
        .faq-question .faq-arrow {
            flex-shrink: 0;
            transition: transform .3s ease;
            font-size: 18px;
            color: var(--primary);
        }
        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease, padding .35s ease;
            padding: 0 24px;
            color: var(--muted);
            font-size: 15px;
            line-height: 1.8;
            background: #FAFBFD;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        /* CTA block */
        .cta-block {
            background: linear-gradient(135deg, var(--primary-dark) 0%, #2B6CB0 60%, #4A8CC7 100%);
            border-radius: var(--radius-xl);
            padding: 48px 40px;
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
            box-shadow: var(--shadow-lg);
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 70% 30%, rgba(255,255,255,0.1) 0%, transparent 55%);
            pointer-events: none;
        }
        .cta-block > * {
            position: relative;
            z-index: 1;
        }
        .cta-block h2 {
            font-size: clamp(22px, 2.6vw, 28px);
            margin: 0 0 8px;
            font-weight: 700;
        }
        .cta-block p {
            margin: 0;
            color: rgba(255,255,255,0.85);
            font-size: 16px;
            max-width: 480px;
            line-height: 1.7;
        }
        .cta-block .btn {
            background: #fff;
            color: var(--primary-dark);
            box-shadow: 0 4px 16px rgba(0,0,0,0.2);
            flex-shrink: 0;
        }
        .cta-block .btn:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0,0,0,0.25);
        }
        .cta-block .btn:active {
            transform: translateY(0);
        }
        /* Footer */
        .site-footer {
            background: #1A202C;
            color: rgba(255,255,255,0.75);
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 40px;
        }
        .footer-brand h4 {
            color: #fff;
            font-size: 22px;
            font-weight: 700;
            margin: 0 0 12px;
            letter-spacing: 1px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255,255,255,0.65);
            margin: 0;
        }
        .footer-col h5 {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin: 0 0 16px;
            letter-spacing: 0.5px;
        }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.65);
            font-size: 14px;
            padding: 4px 0;
            transition: color .2s;
        }
        .footer-col a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding: 20px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255,255,255,0.55);
        }
        .footer-bottom a {
            color: rgba(255,255,255,0.65);
        }
        .footer-bottom a:hover {
            color: #fff;
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .data-card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }
        @media (max-width: 768px) {
            .brand-row {
                flex-wrap: wrap;
                padding: 10px 0;
            }
            .main-nav {
                order: 3;
                flex-basis: 100%;
                overflow-x: auto;
                gap: 2px;
                -webkit-overflow-scrolling: touch;
                scrollbar-width: none;
            }
            .main-nav::-webkit-scrollbar {
                display: none;
            }
            .main-nav a {
                flex: 0 0 auto;
                padding: 6px 12px;
                font-size: 14px;
            }
            .nav-cta {
                margin-left: auto;
            }
            .page-hero {
                padding: 32px 0 36px;
            }
            .page-hero h1 {
                font-size: 24px;
            }
            .page-hero .hero-sub {
                font-size: 15px;
            }
            .section {
                padding: 40px 0;
            }
            .data-card-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .sources-list {
                grid-template-columns: 1fr;
            }
            .cta-block {
                padding: 32px 24px;
                flex-direction: column;
                text-align: center;
            }
            .cta-block p {
                margin-bottom: 0;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }
        }
        @media (max-width: 520px) {
            .page-hero h1 {
                font-size: 20px;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            .data-table {
                font-size: 12px;
                min-width: 520px;
            }
            .data-table thead th,
            .data-table tbody td {
                padding: 10px 12px;
                font-size: 12px;
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 15px;
            }
        }

/* roulang page: category4 */
:root {
            --primary: #2B6CB0;
            --primary-dark: #1A365D;
            --primary-light: #EBF4FF;
            --bg: #F7FAFC;
            --surface: #FFFFFF;
            --ink: #1A202C;
            --muted: #4A5568;
            --border: #E2E8F0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 2px 8px rgba(43, 108, 176, 0.05);
            --shadow-md: 0 8px 24px rgba(43, 108, 176, 0.08);
            --shadow-lg: 0 16px 32px rgba(43, 108, 176, 0.16);
            --spacing-section: 72px;
            --spacing-card: 24px;
            --max-width: 1180px;
            --font-zh: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            --font-en: "Inter", "Segoe UI", sans-serif;
        }
        :root {
            --spacing-section: 48px;
        }
        /* roulang page: brand-news */
        :root {
            --primary: #2B6CB0;
            --primary-dark: #1A365D;
            --primary-light: #EBF4FF;
            --bg: #F7FAFC;
            --surface: #FFFFFF;
            --ink: #1A202C;
            --muted: #4A5568;
            --border: #E2E8F0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 2px 8px rgba(43, 108, 176, 0.05);
            --shadow-md: 0 8px 24px rgba(43, 108, 176, 0.08);
            --shadow-lg: 0 16px 32px rgba(43, 108, 176, 0.16);
            --spacing-section: 72px;
            --spacing-card: 24px;
            --max-width: 1180px;
            --font-zh: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            --font-en: "Inter", "Segoe UI", sans-serif;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-zh);
            background: var(--bg);
            color: var(--ink);
            line-height: 1.8;
            font-size: 16px;
            min-height: 100vh;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color .2s ease, background .2s ease, box-shadow .2s ease, transform .2s ease, opacity .2s ease;
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            display: block;
            max-width: 100%;
            height: auto;
        }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 12px rgba(26, 32, 44, 0.04);
        }
        .brand-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0;
            gap: 16px;
        }
        .logo a {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo a:hover {
            color: var(--primary);
        }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--primary);
            color: #fff;
            border-radius: 10px;
            font-size: 18px;
            font-weight: 700;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav a {
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--muted);
            white-space: nowrap;
            transition: all .2s ease;
        }
        .main-nav a:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
        }
        .main-nav a.active {
            background: var(--primary);
            color: #fff;
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .chip-nav-bar {
            background: var(--primary-light);
            padding: 8px 0;
            border-top: 1px solid rgba(43, 108, 176, 0.08);
        }
        .chip-nav {
            display: flex;
            gap: 8px;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            -ms-overflow-style: none;
            padding: 2px 0;
        }
        .chip-nav::-webkit-scrollbar {
            display: none;
        }
        .chip-nav a {
            flex: 0 0 auto;
            padding: 6px 16px;
            background: var(--surface);
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            color: var(--muted);
            border: 1px solid var(--border);
            transition: all .2s ease;
            white-space: nowrap;
        }
        .chip-nav a:hover {
            background: #fff;
            border-color: var(--primary);
            color: var(--primary);
        }
        .chip-nav a.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: all .25s ease;
            border: none;
            text-align: center;
            gap: 8px;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(43, 108, 176, 0.28);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            box-shadow: 0 8px 20px rgba(43, 108, 176, 0.35);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(43, 108, 176, 0.25);
        }
        .btn-secondary {
            background: var(--surface);
            color: var(--primary);
            border: 2px solid var(--primary);
            box-shadow: none;
        }
        .btn-secondary:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-1px);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }
        /* Sections */
        .page-section {
            padding: var(--spacing-section) 0;
        }
        .page-section + .page-section {
            border-top: 1px solid var(--border);
        }
        .section-title {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary-dark);
            margin-bottom: 24px;
            letter-spacing: 0.5px;
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--muted);
            max-width: 720px;
            margin-bottom: 32px;
        }
        .hero-section {
            background: var(--surface);
            padding: 48px 0 40px;
            text-align: center;
        }
        .hero-section h1 {
            font-size: 36px;
            font-weight: 700;
            color: var(--primary-dark);
            margin-bottom: 16px;
        }
        .hero-summary {
            font-size: 17px;
            color: var(--muted);
            max-width: 800px;
            margin: 0 auto;
            line-height: 1.9;
        }
        /* News list */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .news-item {
            display: flex;
            gap: 20px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 20px;
            box-shadow: var(--shadow-sm);
            transition: all .25s ease;
        }
        .news-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .news-content {
            flex: 1;
        }
        .news-meta {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--muted);
            margin-bottom: 8px;
        }
        .news-tag {
            background: var(--primary-light);
            color: var(--primary-dark);
            padding: 2px 10px;
            border-radius: 999px;
            font-weight: 500;
        }
        .news-title {
            font-size: 20px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 8px;
        }
        .news-summary {
            font-size: 15px;
            color: var(--muted);
            line-height: 1.7;
        }
        .news-thumb {
            width: 200px;
            height: 140px;
            border-radius: var(--radius-md);
            overflow: hidden;
            flex-shrink: 0;
        }
        .news-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        /* Timeline */
        .timeline {
            position: relative;
            padding-left: 32px;
            border-left: 2px solid var(--primary-light);
            margin-left: 16px;
        }
        .timeline-item {
            position: relative;
            margin-bottom: 28px;
            padding-left: 20px;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -8px;
            top: 6px;
            width: 14px;
            height: 14px;
            background: var(--primary);
            border-radius: 50%;
            border: 3px solid var(--primary-light);
        }
        .timeline-year {
            font-weight: 700;
            color: var(--primary);
            font-size: 18px;
            margin-bottom: 4px;
        }
        .timeline-text {
            color: var(--ink);
            font-size: 15px;
        }
        /* Media contact */
        .contact-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }
        .contact-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 20px;
            box-shadow: var(--shadow-sm);
        }
        .contact-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--primary-dark);
            margin-bottom: 8px;
        }
        .contact-card p {
            color: var(--muted);
            font-size: 15px;
            margin-bottom: 4px;
        }
        /* Downloads */
        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 20px;
        }
        .download-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 20px;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            gap: 12px;
            transition: all .25s ease;
        }
        .download-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .download-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--primary-dark);
        }
        .download-card p {
            color: var(--muted);
            font-size: 14px;
            flex: 1;
        }
        .btn-download {
            align-self: flex-start;
        }
        /* Brand values */
        .brand-values {
            background: var(--primary-light);
            border-radius: var(--radius-xl);
            padding: 32px;
        }
        .brand-values p {
            font-size: 16px;
            color: var(--ink);
            line-height: 1.9;
        }
        /* Back home */
        .back-home {
            text-align: center;
            padding: 48px 0;
        }
        /* Footer */
        .site-footer {
            background: #1A202C;
            color: #CBD5E0;
            padding: 40px 0 24px;
            margin-top: 64px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-grid h4, .footer-grid h5 {
            color: #fff;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-grid a {
            display: block;
            color: #CBD5E0;
            margin-bottom: 8px;
            font-size: 14px;
            transition: color .2s;
        }
        .footer-grid a:hover {
            color: var(--primary);
        }
        .footer-grid p {
            font-size: 14px;
            line-height: 1.7;
        }
        .footer-bottom {
            border-top: 1px solid #2D3748;
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: #A0AEC0;
        }
        .footer-bottom a {
            color: #A0AEC0;
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .news-thumb {
                width: 160px;
                height: 120px;
            }
        }
        @media (max-width: 768px) {
            .brand-row {
                flex-wrap: wrap;
            }
            .main-nav {
                order: 3;
                width: 100%;
                justify-content: center;
                gap: 2px;
                flex-wrap: wrap;
            }
            .main-nav a {
                padding: 6px 10px;
                font-size: 13px;
            }
            .hero-section h1 {
                font-size: 28px;
            }
            .section-title {
                font-size: 24px;
            }
            .news-item {
                flex-direction: column;
            }
            .news-thumb {
                width: 100%;
                height: 180px;
                order: -1;
            }
            .timeline {
                padding-left: 20px;
                margin-left: 8px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .hero-summary {
                font-size: 15px;
            }
            .container {
                padding: 0 12px;
            }
            .btn {
                padding: 10px 20px;
                font-size: 14px;
            }
        }

/* roulang page: category3 */
:root {
            --primary: #2B6CB0;
            --primary-dark: #1A365D;
            --primary-light: #EBF4FF;
            --bg: #F7FAFC;
            --surface: #FFFFFF;
            --ink: #1A202C;
            --muted: #4A5568;
            --border: #E2E8F0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 2px 8px rgba(43, 108, 176, 0.05);
            --shadow-md: 0 8px 24px rgba(43, 108, 176, 0.08);
            --shadow-lg: 0 16px 32px rgba(43, 108, 176, 0.16);
            --spacing-section: 72px;
            --spacing-card: 24px;
            --max-width: 1180px;
            --font-zh: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            --font-en: "Inter", "Segoe UI", sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-zh);
            background: var(--bg);
            color: var(--ink);
            line-height: 1.8;
            font-size: 16px;
            min-height: 100vh;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color .2s ease, background .2s ease, box-shadow .2s ease, transform .2s ease, opacity .2s ease;
        }

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

        img {
            display: block;
            max-width: 100%;
            height: auto;
        }

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

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 12px rgba(26, 32, 44, 0.04);
        }

        .brand-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0;
            gap: 16px;
        }

        .logo a {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

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

        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--primary);
            color: #fff;
            border-radius: 10px;
            font-size: 18px;
            font-weight: 700;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .main-nav a {
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--muted);
            white-space: nowrap;
            transition: all .2s ease;
        }

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

        .main-nav a.active {
            background: var(--primary);
            color: #fff;
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .chip-nav-bar {
            background: var(--primary-light);
            padding: 8px 0;
            border-top: 1px solid rgba(43, 108, 176, 0.08);
        }

        .chip-nav {
            display: flex;
            gap: 8px;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            -ms-overflow-style: none;
            padding: 2px 0;
        }

        .chip-nav::-webkit-scrollbar {
            display: none;
        }

        .chip-nav a {
            flex: 0 0 auto;
            padding: 6px 16px;
            background: var(--surface);
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            color: var(--muted);
            border: 1px solid var(--border);
            transition: all .2s ease;
            white-space: nowrap;
        }

        .chip-nav a:hover {
            background: #fff;
            border-color: var(--primary);
            color: var(--primary);
        }

        .chip-nav a.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: all .25s ease;
            border: none;
            text-align: center;
            gap: 8px;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(43, 108, 176, 0.28);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            box-shadow: 0 8px 20px rgba(43, 108, 176, 0.35);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(43, 108, 176, 0.25);
        }

        .btn-secondary {
            background: var(--surface);
            color: var(--primary);
            border: 2px solid var(--primary);
            box-shadow: none;
        }

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

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

        .btn-sm {
            padding: 8px 18px;
            font-size: 14px;
        }

        /* Section Common */
        section {
            padding: var(--spacing-section) 0;
        }

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

        .section-header h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.4;
            margin-bottom: 12px;
        }

        .section-header p {
            font-size: 16px;
            color: var(--muted);
            max-width: 720px;
        }

        .section-subtitle {
            display: inline-block;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: 2px;
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        /* Hero Compact */
        .hero-compact {
            background: linear-gradient(135deg, #1A365D 0%, #2B6CB0 100%);
            padding: 48px 0 56px;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .hero-compact::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            pointer-events: none;
        }

        .hero-compact::before {
            content: '';
            position: absolute;
            bottom: -60%;
            left: -10%;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
            pointer-events: none;
        }

        .hero-compact .container {
            position: relative;
            z-index: 1;
        }

        .hero-compact h1 {
            font-size: 38px;
            font-weight: 700;
            line-height: 1.35;
            margin-bottom: 16px;
            color: #fff;
        }

        .hero-compact .hero-desc {
            font-size: 16px;
            line-height: 1.9;
            color: rgba(255, 255, 255, 0.88);
            max-width: 780px;
        }

        .hero-compact .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 20px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
        }

        .hero-compact .hero-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .hero-compact .hero-meta .dot {
            width: 4px;
            height: 4px;
            background: rgba(255, 255, 255, 0.5);
            border-radius: 50%;
            display: inline-block;
        }

        /* Topic Cards Grid */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 24px;
        }

        .topic-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-md);
            overflow: hidden;
            transition: all .3s ease;
            display: flex;
            flex-direction: column;
        }

        .topic-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(43, 108, 176, 0.3);
        }

        .topic-card .card-img {
            aspect-ratio: 16/9;
            overflow: hidden;
            background: var(--primary-light);
            position: relative;
        }

        .topic-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }

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

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

        .topic-card .card-tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 999px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            align-self: flex-start;
        }

        .topic-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.5;
        }

        .topic-card p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.8;
            flex: 1;
        }

        .topic-card .card-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: var(--muted);
            border-top: 1px solid var(--border);
            padding-top: 14px;
            margin-top: 6px;
        }

        .topic-card .card-footer .date {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        /* Editors */
        .editors-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 20px;
        }

        .editor-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            padding: 24px;
            text-align: center;
            transition: all .3s ease;
            box-shadow: var(--shadow-sm);
        }

        .editor-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
            border-color: rgba(43, 108, 176, 0.25);
        }

        .editor-avatar {
            width: 72px;
            height: 72px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-light), #D6E8FA);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
            font-size: 30px;
            font-weight: 700;
            color: var(--primary);
            border: 3px solid #fff;
            box-shadow: 0 4px 12px rgba(43, 108, 176, 0.15);
        }

        .editor-card h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 4px;
        }

        .editor-card .editor-role {
            font-size: 13px;
            color: var(--primary);
            font-weight: 500;
            margin-bottom: 8px;
        }

        .editor-card p {
            font-size: 13px;
            color: var(--muted);
            line-height: 1.7;
        }

        /* Ranking Sort Bar */
        .ranking-bar {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            padding: 20px 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }

        .ranking-bar .ranking-label {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .ranking-bar .ranking-label .icon {
            width: 24px;
            height: 24px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 6px;
            font-size: 14px;
        }

        .sort-tabs {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

        .sort-tabs button {
            padding: 8px 18px;
            border-radius: 999px;
            border: 1px solid var(--border);
            background: var(--surface);
            color: var(--muted);
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: all .2s ease;
        }

        .sort-tabs button:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
        }

        .sort-tabs button.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }

        /* Subscribe Form */
        .subscribe-box {
            background: linear-gradient(135deg, #1A365D 0%, #2B6CB0 70%, #4A90C4 100%);
            border-radius: var(--radius-xl);
            padding: 40px 36px;
            color: #fff;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            box-shadow: var(--shadow-lg);
        }

        .subscribe-box .subscribe-text h2 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 8px;
            color: #fff;
        }

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

        .subscribe-form {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            min-width: 280px;
            flex: 1;
            max-width: 480px;
        }

        .subscribe-form input[type="email"] {
            flex: 1;
            min-width: 200px;
            padding: 12px 18px;
            border-radius: var(--radius-md);
            border: 2px solid transparent;
            background: #fff;
            color: var(--ink);
            font-size: 14px;
            outline: none;
            transition: all .25s ease;
        }

        .subscribe-form input[type="email"]:focus {
            border-color: #fff;
            box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.3);
        }

        .subscribe-form .btn {
            background: #fff;
            color: var(--primary-dark);
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
            padding: 12px 24px;
        }

        .subscribe-form .btn:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
        }

        /* Archive List */
        .archive-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .archive-item {
            background: var(--surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            transition: all .25s ease;
            box-shadow: var(--shadow-sm);
        }

        .archive-item:hover {
            border-color: rgba(43, 108, 176, 0.3);
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
        }

        .archive-item .archive-info {
            flex: 1;
        }

        .archive-item h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 4px;
        }

        .archive-item p {
            font-size: 14px;
            color: var(--muted);
        }

        .archive-item .archive-date {
            font-size: 13px;
            color: var(--muted);
            white-space: nowrap;
            font-family: var(--font-en);
        }

        /* Back Home CTA */
        .back-home-section {
            text-align: center;
            background: var(--surface);
            border-radius: var(--radius-xl);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-md);
            padding: 48px 24px;
        }

        .back-home-section h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 12px;
        }

        .back-home-section p {
            font-size: 16px;
            color: var(--muted);
            margin-bottom: 28px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }

        .back-home-section .btn-group {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background: #1A202C;
            color: #A0AEC0;
            padding: 56px 0 28px;
            font-size: 14px;
            line-height: 1.8;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 36px;
        }

        .footer-brand h4 {
            font-size: 22px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 14px;
            color: #A0AEC0;
            max-width: 320px;
        }

        .footer-col h5 {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 12px;
        }

        .footer-col a {
            display: block;
            color: #A0AEC0;
            padding: 4px 0;
            font-size: 14px;
            transition: color .2s ease;
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: #718096;
        }

        .footer-bottom a {
            color: #A0AEC0;
            transition: color .2s ease;
        }

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

        /* Responsive */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }

            .topic-grid {
                grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            }

            .hero-compact h1 {
                font-size: 32px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-section: 48px;
            }

            .brand-row {
                flex-wrap: wrap;
                justify-content: center;
                text-align: center;
            }

            .main-nav {
                order: 3;
                width: 100%;
                justify-content: center;
                flex-wrap: wrap;
                gap: 2px;
            }

            .main-nav a {
                padding: 6px 12px;
                font-size: 13px;
            }

            .nav-cta {
                display: none;
            }

            .hero-compact {
                padding: 36px 0 40px;
            }

            .hero-compact h1 {
                font-size: 26px;
            }

            .hero-compact .hero-desc {
                font-size: 14px;
            }

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

            .topic-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .editors-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }

            .ranking-bar {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
                padding: 16px;
            }

            .subscribe-box {
                flex-direction: column;
                align-items: flex-start;
                padding: 28px 20px;
            }

            .subscribe-form {
                width: 100%;
                max-width: 100%;
            }

            .archive-item {
                flex-direction: column;
                align-items: flex-start;
                padding: 14px 16px;
            }

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

            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }
        }

        @media (max-width: 520px) {
            .hero-compact h1 {
                font-size: 22px;
            }

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

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

            .topic-card h3 {
                font-size: 16px;
            }

            .btn {
                padding: 10px 20px;
                font-size: 14px;
            }

            .btn-group {
                flex-direction: column;
            }

            .back-home-section {
                padding: 32px 16px;
            }

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

        /* Focus accessibility */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 3px solid rgba(43, 108, 176, 0.4);
            outline-offset: 2px;
        }

        /* Card image placeholder */
        .card-img .img-placeholder {
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #EBF4FF, #D6E8FA);
            color: var(--primary);
            font-size: 42px;
            font-weight: 700;
        }