/* roulang page: index */
:root {
            --primary: #1e3a5f;
            --primary-light: #2d5a8e;
            --primary-dark: #12263a;
            --accent: #c9a86a;
            --accent-light: #e9dcbf;
            --accent-dark: #a88b4e;
            --bg: #f4f6f9;
            --white: #ffffff;
            --dark: #0f1c2e;
            --text: #2c3e50;
            --text-light: #7f8c9b;
            --text-lighter: #a0aebd;
            --border: #e1e8f0;
            --shadow-sm: 0 2px 8px rgba(15, 28, 46, 0.06);
            --shadow: 0 6px 24px rgba(15, 28, 46, 0.08);
            --shadow-lg: 0 12px 40px rgba(15, 28, 46, 0.12);
            --radius: 14px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --transition: all 0.3s ease;
            --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-main);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
            height: auto;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        button {
            font-family: inherit;
            border: none;
            cursor: pointer;
            background: none;
        }
        input {
            font-family: inherit;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .section {
            padding: 80px 0;
        }
        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 56px;
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, rgba(201, 168, 106, 0.12), rgba(201, 168, 106, 0.06));
            color: var(--accent-dark);
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1px;
            padding: 6px 18px;
            border-radius: 100px;
            margin-bottom: 16px;
            text-transform: uppercase;
        }
        .section-title {
            font-size: 32px;
            font-weight: 700;
            color: var(--dark);
            line-height: 1.3;
            margin-bottom: 12px;
        }
        .section-desc {
            color: var(--text-light);
            font-size: 16px;
            line-height: 1.7;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 100px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            border: 2px solid transparent;
            letter-spacing: 0.5px;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--dark);
            border-color: var(--accent);
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            color: var(--white);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(201, 168, 106, 0.35);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 4px 12px rgba(201, 168, 106, 0.25);
        }
        .btn-outline {
            background: transparent;
            color: var(--white);
            border-color: rgba(255, 255, 255, 0.5);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: var(--white);
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .btn-large {
            padding: 16px 40px;
            font-size: 16px;
        }
        .btn:focus-visible {
            outline: 3px solid rgba(201, 168, 106, 0.5);
            outline-offset: 2px;
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(201, 168, 106, 0.15);
            color: var(--accent-dark);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 100px;
        }
        .badge-blue {
            background: rgba(45, 90, 142, 0.1);
            color: var(--primary-light);
        }
        .badge-green {
            background: rgba(76, 175, 80, 0.12);
            color: #2e7d32;
        }

        /* ========== HEADER ========== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(15, 28, 46, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            transition: var(--transition);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .site-header.scrolled {
            background: rgba(15, 28, 46, 0.98);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 24px;
            height: 72px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--white);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--dark);
            flex-shrink: 0;
        }
        .logo:hover {
            color: var(--accent);
        }
        .nav-card {
            display: flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 100px;
            padding: 6px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 20px;
            border-radius: 100px;
            color: rgba(255, 255, 255, 0.75);
            font-size: 14px;
            font-weight: 500;
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-link i {
            font-size: 14px;
        }
        .nav-link:hover {
            color: var(--white);
            background: rgba(255, 255, 255, 0.08);
        }
        .nav-link.active {
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: var(--dark);
            font-weight: 600;
        }
        .header-cta {
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .header-cta-btn {
            padding: 10px 24px;
            border-radius: 100px;
            background: var(--accent);
            color: var(--dark);
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
            border: 2px solid var(--accent);
        }
        .header-cta-btn:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            color: var(--white);
        }
        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.08);
            color: var(--white);
            font-size: 20px;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.15);
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: 72px;
            left: 0;
            right: 0;
            background: var(--dark);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            padding: 20px 24px;
            flex-direction: column;
            gap: 12px;
            z-index: 999;
            box-shadow: var(--shadow-lg);
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 14px 20px;
            border-radius: 12px;
            color: rgba(255, 255, 255, 0.8);
            font-size: 15px;
            font-weight: 500;
            background: rgba(255, 255, 255, 0.04);
        }
        .mobile-menu a:hover {
            background: rgba(255, 255, 255, 0.1);
            color: var(--white);
        }
        .mobile-menu a.active {
            background: rgba(201, 168, 106, 0.15);
            color: var(--accent);
        }
        .mobile-menu-cta {
            margin-top: 6px;
            justify-content: center;
            background: var(--accent) !important;
            color: var(--dark) !important;
            font-weight: 600;
        }
        .mobile-menu-cta:hover {
            background: var(--accent-dark) !important;
            color: var(--white) !important;
        }

        /* ========== HERO ========== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 140px 0 100px;
            background: linear-gradient(135deg, rgba(15, 28, 46, 0.88), rgba(30, 58, 95, 0.78)), url('/assets/images/backpic/back-1.png') center center/cover no-repeat;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 120px;
            background: linear-gradient(to top, var(--bg), transparent);
            pointer-events: none;
        }
        .hero-inner {
            max-width: 860px;
            padding: 0 24px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(201, 168, 106, 0.2);
            border: 1px solid rgba(201, 168, 106, 0.3);
            color: var(--accent-light);
            font-size: 13px;
            font-weight: 500;
            padding: 6px 18px;
            border-radius: 100px;
            letter-spacing: 0.5px;
            margin-bottom: 28px;
            backdrop-filter: blur(8px);
        }
        .hero-title {
            font-size: 44px;
            font-weight: 800;
            color: var(--white);
            line-height: 1.25;
            margin-bottom: 20px;
            letter-spacing: 1px;
        }
        .hero-title span {
            color: var(--accent);
        }
        .hero-subtitle {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.8);
            line-height: 1.8;
            max-width: 640px;
            margin: 0 auto 36px;
        }
        .hero-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .hero-trust {
            display: flex;
            justify-content: center;
            gap: 30px;
            margin-top: 48px;
            flex-wrap: wrap;
        }
        .trust-item {
            display: flex;
            align-items: center;
            gap: 8px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
        }
        .trust-item i {
            color: var(--accent);
        }

        /* ========== FEATURES ========== */
        .features {
            padding: 80px 0;
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--white);
            border-radius: var(--radius);
            padding: 32px 28px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--accent), var(--accent-light));
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.4s ease;
        }
        .feature-card:hover::before {
            transform: scaleX(1);
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: linear-gradient(135deg, rgba(201, 168, 106, 0.15), rgba(201, 168, 106, 0.05));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--accent-dark);
            margin-bottom: 20px;
        }
        .feature-card:nth-child(2) .feature-icon {
            background: linear-gradient(135deg, rgba(45, 90, 142, 0.12), rgba(45, 90, 142, 0.04));
            color: var(--primary-light);
        }
        .feature-card:nth-child(3) .feature-icon {
            background: linear-gradient(135deg, rgba(76, 175, 80, 0.12), rgba(76, 175, 80, 0.04));
            color: #2e7d32;
        }
        .feature-card:nth-child(4) .feature-icon {
            background: linear-gradient(135deg, rgba(233, 90, 90, 0.12), rgba(233, 90, 90, 0.04));
            color: #c62828;
        }
        .feature-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 10px;
        }
        .feature-desc {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
        }

        /* ========== INTRO ========== */
        .intro {
            background: var(--white);
            padding: 80px 0;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
        }
        .intro-image {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }
        .intro-image img {
            width: 100%;
            height: 400px;
            object-fit: cover;
        }
        .intro-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15, 28, 46, 0.3), transparent 50%);
        }
        .intro-image-badge {
            position: absolute;
            bottom: 20px;
            left: 20px;
            z-index: 2;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 12px;
            padding: 12px 20px;
            display: flex;
            align-items: center;
            gap: 10px;
            box-shadow: var(--shadow);
        }
        .intro-image-badge i {
            color: var(--accent-dark);
            font-size: 20px;
        }
        .intro-image-badge span {
            font-size: 14px;
            font-weight: 600;
            color: var(--dark);
        }
        .intro-content {
            padding: 20px 0;
        }
        .intro-content .section-tag {
            margin-bottom: 12px;
        }
        .intro-content h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--dark);
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .intro-content p {
            color: var(--text-light);
            font-size: 15px;
            line-height: 1.8;
            margin-bottom: 20px;
        }
        .intro-list {
            list-style: none;
            margin-top: 24px;
        }
        .intro-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            margin-bottom: 14px;
            font-size: 15px;
            color: var(--text);
        }
        .intro-list li i {
            color: var(--accent-dark);
            margin-top: 4px;
            flex-shrink: 0;
        }

        /* ========== NEWS ========== */
        .news-section {
            padding: 80px 0;
            background: var(--bg);
        }
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 24px;
        }
        .news-card {
            background: var(--white);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(201, 168, 106, 0.3);
        }
        .news-card-image {
            height: 180px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            position: relative;
            overflow: hidden;
        }
        .news-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .news-card:hover .news-card-image img {
            transform: scale(1.05);
        }
        .news-card-cat {
            position: absolute;
            top: 14px;
            left: 14px;
            z-index: 2;
            background: rgba(255, 255, 255, 0.95);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 100px;
            backdrop-filter: blur(4px);
        }
        .news-card-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-card-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--dark);
            line-height: 1.5;
            margin-bottom: 10px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-card-desc {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 16px;
            flex: 1;
        }
        .news-card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-lighter);
            border-top: 1px solid var(--border);
            padding-top: 14px;
        }
        .news-card-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .empty-tip {
            text-align: center;
            padding: 60px 24px;
            color: var(--text-light);
            font-size: 16px;
            background: var(--white);
            border-radius: var(--radius);
            border: 1px dashed var(--border);
        }

        /* ========== STATS ========== */
        .stats-section {
            background: var(--dark);
            padding: 70px 0;
            position: relative;
            overflow: hidden;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            top: -60%;
            right: -30%;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: rgba(201, 168, 106, 0.06);
            pointer-events: none;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            position: relative;
            z-index: 1;
        }
        .stat-item {
            text-align: center;
            padding: 30px 20px;
            border-radius: var(--radius);
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: var(--transition);
        }
        .stat-item:hover {
            background: rgba(255, 255, 255, 0.06);
            transform: translateY(-4px);
        }
        .stat-num {
            font-size: 40px;
            font-weight: 800;
            color: var(--accent);
            margin-bottom: 6px;
            line-height: 1.2;
        }
        .stat-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            letter-spacing: 0.5px;
        }

        /* ========== FLOW ========== */
        .flow-section {
            padding: 80px 0;
            background: var(--white);
        }
        .flow-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 0;
            position: relative;
        }
        .flow-step {
            text-align: center;
            padding: 30px 24px;
            position: relative;
        }
        .flow-step::after {
            content: '';
            position: absolute;
            top: 56px;
            right: -15%;
            width: 30%;
            height: 2px;
            background: linear-gradient(90deg, var(--accent), var(--accent-light));
            opacity: 0.4;
        }
        .flow-step:last-child::after {
            display: none;
        }
        .flow-number {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: var(--white);
            font-size: 20px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            box-shadow: 0 8px 20px rgba(201, 168, 106, 0.3);
        }
        .flow-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 8px;
        }
        .flow-desc {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.6;
        }

        /* ========== FAQ ========== */
        .faq-section {
            padding: 80px 0;
            background: var(--bg);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            margin-bottom: 16px;
            overflow: hidden;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .faq-item:hover {
            box-shadow: var(--shadow);
            border-color: rgba(201, 168, 106, 0.3);
        }
        .faq-item.active {
            box-shadow: var(--shadow);
            border-color: rgba(201, 168, 106, 0.4);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 22px 28px;
            font-size: 16px;
            font-weight: 600;
            color: var(--dark);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            transition: var(--transition);
            background: transparent;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            font-size: 18px;
            color: var(--accent-dark);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
        }
        .faq-answer-inner {
            padding: 0 28px 24px;
            color: var(--text-light);
            font-size: 15px;
            line-height: 1.8;
            border-top: 1px solid var(--border);
            padding-top: 16px;
            margin-top: 0;
        }

        /* ========== CTA ========== */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--primary-dark), var(--primary)), url('/assets/images/backpic/back-2.png') center center/cover no-repeat;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 28, 46, 0.85), rgba(30, 58, 95, 0.7));
        }
        .cta-inner {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 600px;
            margin: 0 auto;
        }
        .cta-title {
            font-size: 32px;
            font-weight: 700;
            color: var(--white);
            margin-bottom: 16px;
        }
        .cta-desc {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 28px;
            line-height: 1.8;
        }
        .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--dark);
            padding: 60px 0 0;
            color: rgba(255, 255, 255, 0.7);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo {
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            max-width: 280px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--white);
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .footer-col ul li a:hover {
            color: var(--accent);
            transform: translateX(4px);
        }
        .footer-col ul li a i {
            font-size: 12px;
            opacity: 0.6;
        }
        .footer-bottom {
            padding: 24px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .flow-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .flow-step::after {
                display: none;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
            .hero-title {
                font-size: 38px;
            }
        }
        @media (max-width: 768px) {
            .nav-card {
                display: none;
            }
            .header-cta-btn {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .section {
                padding: 60px 0;
            }
            .section-title {
                font-size: 26px;
            }
            .hero {
                padding: 120px 0 80px;
                min-height: auto;
            }
            .hero-title {
                font-size: 32px;
            }
            .hero-subtitle {
                font-size: 16px;
            }
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .intro-image img {
                height: 280px;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .faq-question {
                padding: 18px 20px;
                font-size: 15px;
            }
            .faq-answer-inner {
                padding: 0 20px 20px;
            }
            .cta-title {
                font-size: 26px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                justify-content: center;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .header-inner {
                padding: 0 16px;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-num {
                font-size: 30px;
            }
            .flow-grid {
                grid-template-columns: 1fr;
            }
            .hero-buttons {
                flex-direction: column;
                align-items: center;
            }
            .hero-buttons .btn {
                width: 100%;
                max-width: 280px;
            }
            .hero-trust {
                flex-direction: column;
                gap: 12px;
            }
            .section-desc {
                font-size: 15px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ========== ANIMATIONS ========== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .hero-content {
            animation: fadeInUp 0.8s ease both;
        }
        .section-header {
            animation: fadeInUp 0.6s ease both;
        }

/* roulang page: category1 */
:root {
            --primary: #c8a96a;
            --primary-dark: #b08d4c;
            --primary-light: #e0c88f;
            --dark: #0e0f16;
            --dark-2: #171923;
            --dark-3: #202431;
            --body: #f5f4f1;
            --white: #ffffff;
            --text: #27272b;
            --text-light: #6f6f76;
            --border: #e5e2dc;
            --radius-lg: 20px;
            --radius-md: 14px;
            --radius-sm: 8px;
            --shadow: 0 24px 64px rgba(0, 0, 0, 0.08);
            --shadow-sm: 0 8px 30px rgba(0, 0, 0, 0.06);
            --gradient-gold: linear-gradient(135deg, #d4b478 0%, #b08d4c 100%);
            --transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background: var(--body);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
        }

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

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

        ul,
        ol {
            list-style: none;
        }

        button,
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            background: none;
            cursor: pointer;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 32px;
        }

        .section {
            padding: 96px 0;
        }

        .section-head {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 56px;
        }

        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(200, 169, 106, 0.14);
            color: var(--primary-dark);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 8px 18px;
            border-radius: 100px;
            margin-bottom: 16px;
            letter-spacing: 1px;
        }

        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            line-height: 1.3;
            color: var(--dark);
            margin-bottom: 16px;
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-light);
            line-height: 1.8;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 1rem;
            line-height: 1.4;
            border: 2px solid transparent;
            transition: var(--transition);
            outline: none;
        }

        .btn i {
            font-size: 0.9rem;
        }

        .btn-primary {
            background: var(--gradient-gold);
            color: #141414;
            box-shadow: 0 12px 30px rgba(176, 141, 76, 0.32);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 18px 40px rgba(176, 141, 76, 0.42);
        }

        .btn-outline {
            border-color: rgba(255, 255, 255, 0.4);
            color: #fff;
            background: transparent;
        }

        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: rgba(255, 255, 255, 0.8);
            transform: translateY(-3px);
        }

        .btn-light {
            background: #fff;
            color: #141414;
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.16);
        }

        .btn-light:hover {
            transform: translateY(-3px);
            box-shadow: 0 18px 44px rgba(0, 0, 0, 0.22);
        }

        .btn-lg {
            padding: 17px 46px;
            font-size: 1.08rem;
        }

        .btn:focus-visible,
        .nav-link:focus-visible,
        .nav-toggle:focus-visible,
        .footer a:focus-visible,
        .logo:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 3px;
            border-radius: 6px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            background: rgba(14, 15, 22, 0.97);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.07);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 32px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.12rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .logo-icon {
            width: 42px;
            height: 42px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--gradient-gold);
            border-radius: 12px;
            color: #141414;
            font-size: 1.2rem;
            box-shadow: 0 8px 20px rgba(200, 169, 106, 0.35);
        }

        .nav-card {
            display: flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.08);
            padding: 6px;
            border-radius: 16px;
        }

        .nav-link {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: 12px;
            font-size: 0.92rem;
            font-weight: 500;
            color: #b8bcc9;
            white-space: nowrap;
        }

        .nav-link i {
            font-size: 0.9rem;
        }

        .nav-link:hover {
            background: rgba(255, 255, 255, 0.1);
            color: #ffffff;
            transform: translateY(-1px);
        }

        .nav-link.active {
            background: var(--gradient-gold);
            color: #141414;
            font-weight: 700;
            box-shadow: 0 8px 22px rgba(200, 169, 106, 0.4);
        }

        .header-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .header-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 11px 24px;
            border-radius: 100px;
            background: var(--gradient-gold);
            color: #141414;
            font-size: 0.92rem;
            font-weight: 700;
            box-shadow: 0 8px 24px rgba(200, 169, 106, 0.32);
            transition: var(--transition);
        }

        .header-cta-btn:hover {
            transform: translateY(-2px) scale(1.02);
            box-shadow: 0 12px 32px rgba(200, 169, 106, 0.46);
        }

        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            font-size: 1.2rem;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }

        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.2);
        }

        /* ===== Hero ===== */
        .page-hero {
            position: relative;
            padding: 130px 0 110px;
            background: linear-gradient(to bottom, rgba(10, 10, 16, 0.9), rgba(10, 10, 16, 0.82)), url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            color: #ffffff;
            text-align: center;
            overflow: hidden;
        }

        .page-hero::before {
            content: "";
            position: absolute;
            top: -120px;
            right: -80px;
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(200, 169, 106, 0.22), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .page-hero .container {
            position: relative;
            z-index: 2;
        }

        .hero-breadcrumb {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.12);
            padding: 8px 20px;
            border-radius: 100px;
            margin-bottom: 28px;
            backdrop-filter: blur(8px);
        }

        .hero-breadcrumb a {
            color: rgba(255, 255, 255, 0.75);
        }

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

        .hero-breadcrumb .sep {
            color: rgba(255, 255, 255, 0.4);
            font-size: 0.7rem;
        }

        .hero-breadcrumb .current {
            color: var(--primary-light);
        }

        .hero-tag {
            display: inline-block;
            background: rgba(200, 169, 106, 0.22);
            border: 1px solid rgba(200, 169, 106, 0.45);
            color: var(--primary-light);
            font-size: 0.88rem;
            font-weight: 600;
            letter-spacing: 2px;
            padding: 8px 22px;
            border-radius: 100px;
            margin-bottom: 24px;
        }

        .page-hero h1 {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1.25;
            max-width: 820px;
            margin: 0 auto 22px;
            letter-spacing: 1px;
        }

        .page-hero h1 .highlight {
            color: var(--primary-light);
        }

        .hero-desc {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.78);
            max-width: 680px;
            margin: 0 auto 40px;
            line-height: 1.9;
        }

        .hero-buttons {
            display: flex;
            justify-content: center;
            gap: 18px;
            flex-wrap: wrap;
        }

        .hero-points {
            display: flex;
            justify-content: center;
            gap: 36px;
            margin-top: 56px;
            flex-wrap: wrap;
        }

        .hero-point {
            display: flex;
            align-items: center;
            gap: 10px;
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.92rem;
        }

        .hero-point i {
            color: var(--primary-light);
        }

        /* ===== Overview ===== */
        .overview-section {
            background: #ffffff;
            border-bottom: 1px solid var(--border);
        }

        .overview-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 64px;
            align-items: center;
        }

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

        .overview-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 360px;
            transition: transform 0.8s ease;
        }

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

        .overview-image::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.2), transparent 60%);
        }

        .overview-image-badge {
            position: absolute;
            left: 24px;
            bottom: 24px;
            z-index: 2;
            background: rgba(14, 15, 22, 0.82);
            backdrop-filter: blur(8px);
            color: #fff;
            padding: 12px 20px;
            border-radius: 14px;
            font-size: 0.9rem;
            border: 1px solid rgba(255, 255, 255, 0.14);
        }

        .overview-image-badge i {
            color: var(--primary-light);
            margin-right: 8px;
        }

        .overview-content .section-tag {
            margin-bottom: 12px;
        }

        .overview-content h2 {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.35;
            color: var(--dark);
            margin-bottom: 20px;
        }

        .overview-content p {
            color: var(--text-light);
            font-size: 1.02rem;
            line-height: 1.9;
            margin-bottom: 24px;
        }

        .overview-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
            margin-top: 28px;
        }

        .overview-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 14px 16px;
            background: var(--body);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text);
        }

        .overview-list li i {
            color: var(--primary-dark);
            margin-top: 3px;
        }

        /* ===== Features ===== */
        .features-section {
            background: var(--body);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }

        .feature-card {
            background: #ffffff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--gradient-gold);
            opacity: 0;
            transition: var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow);
            border-color: transparent;
        }

        .feature-card:hover::before {
            opacity: 1;
        }

        .feature-icon {
            width: 60px;
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(200, 169, 106, 0.18), rgba(200, 169, 106, 0.08));
            border-radius: 16px;
            color: var(--primary-dark);
            font-size: 1.5rem;
            margin-bottom: 22px;
            transition: var(--transition);
        }

        .feature-card:hover .feature-icon {
            background: var(--gradient-gold);
            color: #141414;
            transform: scale(1.05);
        }

        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 12px;
        }

        .feature-card p {
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.75;
        }

        /* ===== Process ===== */
        .process-section {
            background: var(--dark);
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .process-section::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.12;
            pointer-events: none;
        }

        .process-section .container {
            position: relative;
            z-index: 2;
        }

        .process-section .section-title {
            color: #ffffff;
        }

        .process-section .section-desc {
            color: rgba(255, 255, 255, 0.7);
        }

        .process-section .section-tag {
            background: rgba(200, 169, 106, 0.18);
            color: var(--primary-light);
        }

        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            margin-top: 20px;
        }

        .process-step {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-lg);
            padding: 36px 30px;
            position: relative;
            backdrop-filter: blur(8px);
            transition: var(--transition);
        }

        .process-step:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-6px);
        }

        .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 52px;
            height: 52px;
            background: var(--gradient-gold);
            border-radius: 16px;
            color: #141414;
            font-size: 1.3rem;
            font-weight: 800;
            margin-bottom: 20px;
            box-shadow: 0 10px 24px rgba(200, 169, 106, 0.35);
        }

        .process-step h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: #fff;
        }

        .process-step p {
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.92rem;
            line-height: 1.75;
        }

        /* ===== Modules ===== */
        .modules-section {
            background: #ffffff;
        }

        .modules-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }

        .module-card {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border);
            background: #fff;
            transition: var(--transition);
        }

        .module-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow);
            border-color: transparent;
        }

        .module-card-img {
            position: relative;
            height: 240px;
            overflow: hidden;
        }

        .module-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.8s ease;
        }

        .module-card:hover .module-card-img img {
            transform: scale(1.06);
        }

        .module-card-img::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.25), transparent 55%);
        }

        .module-tag {
            position: absolute;
            top: 18px;
            left: 18px;
            z-index: 2;
            background: rgba(14, 15, 22, 0.82);
            color: var(--primary-light);
            font-size: 0.82rem;
            font-weight: 600;
            padding: 6px 16px;
            border-radius: 100px;
            backdrop-filter: blur(6px);
        }

        .module-card-body {
            padding: 28px 26px 30px;
        }

        .module-card-body h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 12px;
        }

        .module-card-body p {
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.8;
            margin-bottom: 18px;
        }

        .module-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--primary-dark);
            font-weight: 600;
            font-size: 0.95rem;
        }

        .module-link i {
            transition: transform 0.3s ease;
        }

        .module-link:hover {
            color: var(--dark);
        }

        .module-link:hover i {
            transform: translateX(4px);
        }

        /* ===== Stats ===== */
        .stats-section {
            background: linear-gradient(135deg, #191b26, #202431);
            padding: 80px 0;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .stats-section::before {
            content: "";
            position: absolute;
            bottom: -100px;
            left: -60px;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(200, 169, 106, 0.2), transparent 70%);
            border-radius: 50%;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            text-align: center;
            position: relative;
            z-index: 2;
        }

        .stat-item .stat-num {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--primary-light);
            line-height: 1.2;
        }

        .stat-item .stat-label {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.98rem;
            margin-top: 10px;
        }

        .stat-item .stat-line {
            width: 40px;
            height: 3px;
            background: var(--gradient-gold);
            margin: 18px auto 0;
            border-radius: 4px;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--body);
        }

        .faq-wrap {
            max-width: 840px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

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

        .faq-item:hover {
            border-color: rgba(200, 169, 106, 0.4);
            box-shadow: var(--shadow-sm);
        }

        .faq-item summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            padding: 24px 28px;
            cursor: pointer;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--dark);
            list-style: none;
            transition: var(--transition);
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary:hover {
            background: rgba(200, 169, 106, 0.04);
        }

        .faq-item summary .faq-icon {
            width: 34px;
            height: 34px;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(200, 169, 106, 0.14);
            border-radius: 50%;
            color: var(--primary-dark);
            transition: transform 0.4s ease;
        }

        .faq-item[open] summary .faq-icon {
            transform: rotate(180deg);
            background: var(--gradient-gold);
            color: #141414;
        }

        .faq-item .faq-body {
            padding: 0 28px 26px;
            color: var(--text-light);
            font-size: 0.97rem;
            line-height: 1.85;
            border-top: 1px solid var(--border);
            padding-top: 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 100px 0;
            position: relative;
            background: linear-gradient(to right, rgba(14, 15, 22, 0.92), rgba(23, 25, 35, 0.88)), url('/assets/images/backpic/back-3.webp') center center / cover no-repeat;
            color: #fff;
            text-align: center;
        }

        .cta-section h2 {
            font-size: 2.4rem;
            font-weight: 800;
            margin-bottom: 18px;
            color: #fff;
        }

        .cta-section p {
            font-size: 1.08rem;
            color: rgba(255, 255, 255, 0.72);
            max-width: 600px;
            margin: 0 auto 40px;
            line-height: 1.85;
        }

        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 18px;
            flex-wrap: wrap;
        }

        .cta-note {
            margin-top: 24px;
            font-size: 0.86rem;
            color: rgba(255, 255, 255, 0.45);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 70px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 50px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .footer-brand .logo {
            margin-bottom: 18px;
        }

        .footer-brand p {
            font-size: 0.94rem;
            line-height: 1.85;
            color: rgba(255, 255, 255, 0.55);
            max-width: 260px;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 1.02rem;
            font-weight: 700;
            margin-bottom: 18px;
        }

        .footer-col ul li {
            margin-bottom: 12px;
        }

        .footer-col ul a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.92rem;
            transition: var(--transition);
        }

        .footer-col ul a i {
            font-size: 0.6rem;
            color: var(--primary-light);
        }

        .footer-col ul a:hover {
            color: #fff;
            transform: translateX(4px);
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            padding: 24px 0 28px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
        }

        .footer-bottom .domain {
            color: rgba(255, 255, 255, 0.55);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .container {
                padding: 0 24px;
            }

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

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

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

            .overview-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }

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

            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 40px;
            }

            .nav-card {
                display: none;
                position: absolute;
                top: calc(100% + 12px);
                left: 24px;
                right: 24px;
                background: rgba(14, 15, 22, 0.98);
                flex-direction: column;
                align-items: stretch;
                padding: 16px;
                border-radius: var(--radius-lg);
                box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
                text-align: center;
            }

            .nav-card.nav-open {
                display: flex;
            }

            .nav-link {
                justify-content: center;
                padding: 14px 20px;
            }

            .nav-toggle {
                display: flex;
            }

            .header-cta-btn {
                display: none;
            }
        }

        @media (max-width: 768px) {
            .section {
                padding: 72px 0;
            }

            .section-title {
                font-size: 1.75rem;
            }

            .page-hero {
                padding: 90px 0 70px;
            }

            .page-hero h1 {
                font-size: 2rem;
            }

            .hero-desc {
                font-size: 1rem;
            }

            .hero-points {
                gap: 18px;
                margin-top: 40px;
            }

            .hero-point {
                font-size: 0.82rem;
            }

            .features-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .process-steps {
                grid-template-columns: 1fr;
                gap: 20px;
            }

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

            .overview-list {
                grid-template-columns: 1fr;
            }

            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px 20px;
            }

            .stat-item .stat-num {
                font-size: 2rem;
            }

            .faq-item summary {
                padding: 20px 20px;
                font-size: 0.98rem;
            }

            .faq-item .faq-body {
                padding: 0 20px 22px;
                padding-top: 16px;
            }

            .cta-section h2 {
                font-size: 1.8rem;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 36px;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
                justify-content: center;
            }

            .hero-buttons .btn,
            .cta-buttons .btn {
                width: 100%;
                max-width: 320px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 18px;
            }

            .header-inner {
                padding: 14px 18px;
            }

            .logo {
                font-size: 0.96rem;
            }

            .logo-icon {
                width: 36px;
                height: 36px;
                font-size: 1rem;
            }

            .page-hero h1 {
                font-size: 1.6rem;
            }

            .section-title {
                font-size: 1.5rem;
            }

            .section-desc {
                font-size: 0.95rem;
            }

            .hero-points {
                flex-direction: column;
                gap: 12px;
            }

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

            .btn-lg {
                padding: 15px 32px;
                font-size: 1rem;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #0f1d36;
            --primary-light: #1b2e52;
            --accent: #c9a227;
            --accent-light: #e6c86a;
            --bg-main: #f2f4f9;
            --bg-card: #ffffff;
            --text-main: #1e2430;
            --text-muted: #667085;
            --border: #e2e6f0;
            --radius-sm: 10px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --shadow-sm: 0 2px 8px rgba(15, 29, 54, 0.06);
            --shadow-md: 0 8px 24px rgba(15, 29, 54, 0.08);
            --shadow-lg: 0 16px 40px rgba(15, 29, 54, 0.12);
            --transition: all 0.3s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background: var(--bg-main);
            color: var(--text-main);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            border: none;
            background: none;
            cursor: pointer;
            font-family: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            padding: 14px 24px;
            max-width: 1280px;
            margin: 0 auto;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--accent), var(--accent-light));
            color: #fff;
            font-size: 18px;
            box-shadow: 0 4px 14px rgba(201, 162, 39, 0.35);
        }

        .nav-card {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 6px;
            background: #eef0f6;
            border-radius: 40px;
        }

        .nav-link {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 9px 18px;
            border-radius: 32px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-muted);
            transition: var(--transition);
        }

        .nav-link i {
            font-size: 14px;
        }

        .nav-link:hover {
            color: var(--primary);
            background: rgba(255, 255, 255, 0.8);
        }

        .nav-link.active {
            background: var(--primary);
            color: #ffffff;
            box-shadow: 0 4px 12px rgba(15, 29, 54, 0.25);
        }

        .header-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .header-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: 32px;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            font-size: 14px;
            box-shadow: 0 4px 14px rgba(201, 162, 39, 0.35);
            transition: var(--transition);
        }

        .header-cta-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(201, 162, 39, 0.45);
        }

        .nav-toggle {
            display: none;
            width: 42px;
            height: 42px;
            border-radius: 12px;
            background: var(--primary);
            color: #fff;
            font-size: 18px;
            align-items: center;
            justify-content: center;
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            background: linear-gradient(135deg, rgba(15, 29, 54, 0.93), rgba(27, 46, 82, 0.82)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            color: #fff;
            padding: 110px 0 100px;
            text-align: center;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 18px;
            border-radius: 40px;
            background: rgba(255, 255, 255, 0.14);
            border: 1px solid rgba(255, 255, 255, 0.25);
            font-size: 14px;
            font-weight: 500;
            letter-spacing: 1px;
            margin-bottom: 24px;
        }

        .hero h1 {
            font-size: 52px;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 20px;
            letter-spacing: 1px;
        }

        .hero h1 span {
            color: var(--accent-light);
        }

        .hero-desc {
            max-width: 720px;
            margin: 0 auto 36px;
            font-size: 18px;
            color: rgba(255, 255, 255, 0.88);
            line-height: 1.8;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 40px;
            font-size: 15px;
            font-weight: 600;
            transition: var(--transition);
        }

        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 6px 20px rgba(201, 162, 39, 0.4);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 28px rgba(201, 162, 39, 0.5);
        }

        .btn-ghost {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.3);
        }

        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.22);
            transform: translateY(-3px);
        }

        .hero-meta {
            display: flex;
            justify-content: center;
            gap: 32px;
            margin-top: 48px;
            flex-wrap: wrap;
        }

        .hero-meta-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.8);
        }

        .hero-meta-item i {
            color: var(--accent-light);
        }

        /* ===== Section Common ===== */
        .section {
            padding: 90px 0;
        }

        .section-head {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 55px;
        }

        .section-tag {
            display: inline-block;
            padding: 6px 16px;
            border-radius: 40px;
            background: rgba(201, 162, 39, 0.1);
            color: var(--accent);
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1px;
            margin-bottom: 14px;
        }

        .section-head h2 {
            font-size: 36px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.35;
            margin-bottom: 14px;
        }

        .section-head p {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ===== Features ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), var(--accent-light));
            opacity: 0;
            transition: var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-md);
        }

        .feature-card:hover::before {
            opacity: 1;
        }

        .feature-icon {
            width: 60px;
            height: 60px;
            border-radius: 16px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: var(--accent-light);
            font-size: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
            box-shadow: 0 6px 18px rgba(15, 29, 54, 0.2);
        }

        .feature-card h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 12px;
        }

        .feature-card p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.75;
        }

        /* ===== Channel Cards ===== */
        .channel-section {
            background: #fff;
        }

        .channel-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

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

        .channel-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-md);
        }

        .channel-img {
            height: 170px;
            overflow: hidden;
            position: relative;
        }

        .channel-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .channel-card:hover .channel-img img {
            transform: scale(1.06);
        }

        .channel-img::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15, 29, 54, 0.25), transparent);
        }

        .channel-body {
            padding: 22px 22px 26px;
        }

        .channel-body h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .channel-body h3 i {
            color: var(--accent);
            font-size: 15px;
        }

        .channel-body p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .channel-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 14px;
            font-size: 14px;
            font-weight: 500;
            color: var(--accent);
            transition: var(--transition);
        }

        .channel-link:hover {
            gap: 12px;
            color: var(--primary);
        }

        /* ===== Stats ===== */
        .stats-section {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            padding: 80px 0;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            text-align: center;
        }

        .stat-item {
            padding: 20px;
            border-radius: var(--radius-md);
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: var(--transition);
        }

        .stat-item:hover {
            background: rgba(255, 255, 255, 0.12);
            transform: translateY(-4px);
        }

        .stat-num {
            font-size: 48px;
            font-weight: 800;
            color: var(--accent-light);
            line-height: 1.2;
            margin-bottom: 6px;
        }

        .stat-label {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.8);
        }

        /* ===== Hot Info ===== */
        .hot-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .hot-card {
            display: flex;
            gap: 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 26px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

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

        .hot-index {
            flex-shrink: 0;
            width: 46px;
            height: 46px;
            border-radius: 14px;
            background: var(--primary);
            color: var(--accent-light);
            font-size: 18px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .hot-content {
            flex: 1;
        }

        .hot-tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 6px;
            background: rgba(201, 162, 39, 0.12);
            color: var(--accent);
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .hot-content h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .hot-content p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.65;
        }

        .hot-read {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 500;
            color: var(--primary);
            margin-top: 12px;
            transition: var(--transition);
        }

        .hot-read:hover {
            color: var(--accent);
            gap: 10px;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: #fff;
        }

        .faq-list {
            max-width: 840px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

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

        .faq-item:hover {
            border-color: rgba(201, 162, 39, 0.3);
            box-shadow: var(--shadow-sm);
        }

        .faq-q {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 22px 26px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--primary);
        }

        .faq-q i {
            color: var(--accent);
            transition: transform 0.3s;
            font-size: 14px;
        }

        .faq-item.active .faq-q i {
            transform: rotate(180deg);
        }

        .faq-a {
            padding: 0 26px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s;
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.75;
            border-top: 0 solid var(--border);
        }

        .faq-item.active .faq-a {
            max-height: 420px;
            padding: 0 26px 22px;
            border-top-width: 1px;
            padding-top: 18px;
            margin-top: 0;
        }

        /* ===== CTA ===== */
        .cta-section {
            position: relative;
            background: linear-gradient(135deg, rgba(15, 29, 54, 0.95), rgba(27, 46, 82, 0.85)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            color: #fff;
            text-align: center;
            padding: 90px 0;
        }

        .cta-tag {
            display: inline-block;
            padding: 6px 16px;
            border-radius: 40px;
            background: rgba(255, 255, 255, 0.15);
            border: 1px solid rgba(255, 255, 255, 0.2);
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 1px;
            margin-bottom: 20px;
        }

        .cta-section h2 {
            font-size: 40px;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .cta-section p {
            max-width: 620px;
            margin: 0 auto 36px;
            font-size: 17px;
            color: rgba(255, 255, 255, 0.85);
        }

        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.75);
            padding: 70px 0 30px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 50px;
        }

        .footer-brand .logo {
            color: #fff;
            margin-bottom: 14px;
        }

        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            max-width: 320px;
            line-height: 1.7;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 18px;
        }

        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-col a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            transition: var(--transition);
        }

        .footer-col a:hover {
            color: var(--accent-light);
            padding-left: 4px;
        }

        .footer-col a i {
            font-size: 10px;
            color: var(--accent);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .channel-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .features-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 20px;
            }
            .hero h1 {
                font-size: 40px;
            }
        }

        @media (max-width: 768px) {
            .header-inner {
                padding: 12px 16px;
                flex-wrap: wrap;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-card {
                position: absolute;
                top: 62px;
                left: 16px;
                right: 16px;
                flex-direction: column;
                background: #fff;
                border-radius: 16px;
                box-shadow: var(--shadow-lg);
                padding: 16px;
                display: none;
                z-index: 99;
                align-items: stretch;
            }
            .nav-card.open {
                display: flex;
            }
            .nav-link {
                border-radius: 12px;
                padding: 12px 16px;
                justify-content: flex-start;
            }
            .header-cta-btn {
                display: none;
            }
            .hero {
                padding: 80px 0;
            }
            .hero h1 {
                font-size: 32px;
            }
            .hero-desc {
                font-size: 16px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .hot-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
            .section-head h2 {
                font-size: 28px;
            }
            .cta-section h2 {
                font-size: 30px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .header-cta-btn {
                display: none;
            }
            .logo {
                font-size: 17px;
            }
            .logo-icon {
                width: 36px;
                height: 36px;
                font-size: 15px;
            }
            .channel-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .stat-num {
                font-size: 34px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 26px;
            }
            .hero-meta {
                gap: 16px;
                flex-direction: column;
            }
            .faq-q {
                font-size: 14px;
                padding: 18px 18px;
            }
            .faq-a {
                font-size: 14px;
                padding: 0 18px;
            }
            .faq-item.active .faq-a {
                padding: 0 18px 18px;
            }
            .section {
                padding: 64px 0;
            }
        }

/* roulang page: article */
:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-darker: #1e3a8a;
            --primary-light: #eff6ff;
            --bg: #f8fafc;
            --card-bg: #ffffff;
            --text: #0f172a;
            --text-secondary: #64748b;
            --border: #e2e8f0;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --radius-full: 999px;
            --shadow: 0 2px 10px rgba(15, 23, 42, 0.06);
            --shadow-hover: 0 12px 32px rgba(15, 23, 42, 0.12);
            --shadow-blue: 0 6px 20px rgba(37, 99, 235, 0.25);
            --transition: all 0.3s ease;
            --container-max: 1200px;
            --header-height: 72px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.75;
            color: var(--text);
            background: var(--bg);
        }
        img {
            max-width: 100%;
            display: block;
            height: auto;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        button {
            font: inherit;
        }
        ul,
        ol {
            list-style-position: outside;
        }

        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-narrow {
            max-width: 880px;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            min-height: var(--header-height);
            padding: 12px 0;
        }
        .logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 21px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.02em;
            white-space: nowrap;
        }
        .logo:hover {
            color: var(--primary);
        }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, #2563eb, #1e40af);
            color: #fff;
            font-size: 17px;
            box-shadow: var(--shadow-blue);
            flex-shrink: 0;
        }
        .nav-card {
            display: flex;
            align-items: center;
            gap: 4px;
            background: #f1f5f9;
            border: 1px solid var(--border);
            border-radius: var(--radius-full);
            padding: 5px;
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 9px 20px;
            border-radius: var(--radius-full);
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            white-space: nowrap;
            transition: var(--transition);
        }
        .nav-link i {
            font-size: 13px;
            opacity: 0.8;
        }
        .nav-link:hover {
            color: var(--primary);
            background: rgba(255, 255, 255, 0.8);
        }
        .nav-link.active {
            background: var(--primary);
            color: #fff;
            box-shadow: var(--shadow-blue);
        }
        .nav-link.active i {
            opacity: 1;
        }
        .header-cta {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .header-cta-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: var(--radius-full);
            background: var(--primary);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            box-shadow: var(--shadow-blue);
            transition: var(--transition);
        }
        .header-cta-btn:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
        }
        .nav-toggle {
            display: none;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            background: #fff;
            color: var(--text);
            font-size: 18px;
        }

        .page-banner {
            position: relative;
            padding: 96px 0 72px;
            text-align: center;
            background: linear-gradient(180deg, rgba(239, 246, 255, 0.95) 0%, rgba(248, 250, 252, 1) 100%), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            border-bottom: 1px solid var(--border);
        }
        .page-banner .container {
            position: relative;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 24px;
        }
        .breadcrumb a {
            color: var(--text-secondary);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb-sep {
            color: #cbd5e1;
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            border-radius: var(--radius-full);
            font-size: 13px;
            font-weight: 600;
        }
        .badge-blue {
            background: rgba(37, 99, 235, 0.1);
            color: var(--primary);
            border: 1px solid rgba(37, 99, 235, 0.18);
        }
        .page-banner h1 {
            font-size: 40px;
            line-height: 1.3;
            font-weight: 800;
            margin-top: 16px;
            margin-bottom: 18px;
            max-width: 850px;
            margin-left: auto;
            margin-right: auto;
            color: var(--text);
            letter-spacing: -0.02em;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            gap: 18px;
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 8px;
        }
        .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta i {
            color: var(--primary);
            opacity: 0.7;
        }

        .article-main {
            padding: 56px 0 64px;
        }
        .article-content {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 48px 56px;
            box-shadow: var(--shadow);
            font-size: 16px;
            line-height: 1.95;
            color: var(--text);
        }
        .article-content > *:last-child {
            margin-bottom: 0;
        }
        .article-content p {
            margin-bottom: 20px;
        }
        .article-content h2,
        .article-content h3,
        .article-content h4 {
            font-weight: 700;
            color: var(--text);
            line-height: 1.45;
        }
        .article-content h2 {
            font-size: 28px;
            margin-top: 40px;
            margin-bottom: 16px;
        }
        .article-content h3 {
            font-size: 22px;
            margin-top: 32px;
            margin-bottom: 14px;
        }
        .article-content h4 {
            font-size: 18px;
            margin-top: 24px;
            margin-bottom: 10px;
        }
        .article-content ul,
        .article-content ol {
            margin: 0 0 22px 22px;
        }
        .article-content ul {
            list-style: disc;
        }
        .article-content ol {
            list-style: decimal;
        }
        .article-content li {
            margin-bottom: 8px;
        }
        .article-content blockquote {
            position: relative;
            margin: 24px 0;
            padding: 18px 24px 18px 28px;
            background: var(--primary-light);
            border-left: 4px solid var(--primary);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
        }
        .article-content img {
            border-radius: var(--radius-sm);
            margin: 28px 0;
            width: 100%;
        }
        .article-content table {
            width: 100%;
            margin: 24px 0;
            border-collapse: collapse;
            font-size: 15px;
        }
        .article-content table th,
        .article-content table td {
            border: 1px solid var(--border);
            padding: 12px 16px;
            text-align: left;
        }
        .article-content table th {
            background: #f8fafc;
            font-weight: 600;
        }
        .article-content code {
            background: #f1f5f9;
            padding: 3px 8px;
            border-radius: 6px;
            font-size: 14px;
        }
        .article-content pre {
            background: #0f172a;
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            margin-bottom: 22px;
        }
        .article-content pre code {
            background: transparent;
            padding: 0;
            color: inherit;
        }
        .article-extra {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            margin-top: 32px;
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .not-found {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            text-align: center;
            padding: 80px 40px;
            box-shadow: var(--shadow);
        }
        .not-found-icon {
            width: 72px;
            height: 72px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 24px;
        }
        .not-found h2 {
            font-size: 28px;
            margin-bottom: 12px;
        }
        .not-found p {
            color: var(--text-secondary);
            margin-bottom: 28px;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            padding: 12px 30px;
            border-radius: var(--radius-full);
            font-size: 15px;
            box-shadow: var(--shadow-blue);
            transition: var(--transition);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
        }

        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 48px;
        }
        .section-tag {
            display: inline-block;
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            padding: 5px 16px;
            border-radius: var(--radius-full);
            margin-bottom: 12px;
            border: 1px solid rgba(37, 99, 235, 0.15);
        }
        .section-header h2 {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 10px;
            letter-spacing: -0.02em;
            color: var(--text);
        }
        .section-header p {
            color: var(--text-secondary);
            font-size: 16px;
        }

        .related-section {
            padding: 64px 0;
            background: #fff;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .related-card {
            display: flex;
            flex-direction: column;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .related-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(37, 99, 235, 0.2);
        }
        .card-img {
            position: relative;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: #e2e8f0;
        }
        .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .related-card:hover .card-img img {
            transform: scale(1.06);
        }
        .card-body {
            padding: 22px 24px 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .card-body h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .card-body p {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-secondary);
            flex: 1;
        }
        .card-link {
            margin-top: 16px;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .card-link i {
            transition: transform 0.3s ease;
            font-size: 12px;
        }
        .related-card:hover .card-link i {
            transform: translateX(4px);
        }

        .feature-section {
            padding: 72px 0;
            background: var(--bg);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px 26px;
            text-align: center;
            transition: var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(37, 99, 235, 0.15);
        }
        .feature-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 22px;
            margin-bottom: 18px;
        }
        .feature-card h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .feature-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .faq-section {
            padding: 72px 0;
            background: #fff;
        }
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .faq-item[open] {
            border-color: rgba(37, 99, 235, 0.25);
            box-shadow: var(--shadow-hover);
        }
        .faq-item summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 18px 22px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            list-style: none;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 13px;
            color: var(--text-secondary);
            transition: transform 0.3s ease;
        }
        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }
        .faq-item p {
            padding: 0 22px 20px;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.8;
        }

        .cta-section {
            position: relative;
            padding: 88px 0;
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.95), rgba(30, 58, 138, 0.92)), url('/assets/images/backpic/back-3.webp') center/cover no-repeat;
            color: #fff;
            text-align: center;
        }
        .cta-inner {
            max-width: 700px;
            margin: 0 auto;
        }
        .cta-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.15);
            border: 1px solid rgba(255, 255, 255, 0.25);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            margin-bottom: 22px;
        }
        .cta-inner h2 {
            font-size: 34px;
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }
        .cta-inner p {
            color: rgba(255, 255, 255, 0.9);
            margin-bottom: 28px;
            font-size: 16px;
        }
        .cta-buttons {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 14px;
        }
        .btn-white {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            color: var(--primary-dark);
            font-weight: 600;
            padding: 12px 34px;
            border-radius: var(--radius-full);
            font-size: 15px;
            transition: var(--transition);
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
        }
        .btn-white:hover {
            background: #f1f5f9;
            color: var(--primary-darker);
            transform: translateY(-2px);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            border: 1px solid rgba(255, 255, 255, 0.7);
            color: #fff;
            font-weight: 600;
            padding: 12px 34px;
            border-radius: var(--radius-full);
            font-size: 15px;
            transition: var(--transition);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            transform: translateY(-2px);
        }

        .site-footer {
            background: #0f172a;
            color: #e2e8f0;
            padding: 64px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 48px;
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: 14px;
        }
        .footer-brand p {
            font-size: 14px;
            color: #94a3b8;
            line-height: 1.8;
            max-width: 320px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 16px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 28px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul a {
            color: #94a3b8;
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition);
        }
        .footer-col ul a i {
            font-size: 11px;
            color: #475569;
            transition: var(--transition);
        }
        .footer-col ul a:hover {
            color: #fff;
        }
        .footer-col ul a:hover i {
            color: var(--primary);
            transform: translateX(3px);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 18px 0;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 13px;
            color: #64748b;
        }

        @media (min-width: 769px) {
            .nav-card {
                display: flex;
            }
        }

        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .related-grid {
                gap: 20px;
            }
            .article-content {
                padding: 40px 36px;
            }
            .page-banner {
                padding: 76px 0 56px;
            }
            .page-banner h1 {
                font-size: 32px;
            }
            .section-header h2 {
                font-size: 28px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            .site-header .header-cta .header-cta-btn {
                display: none;
            }
            .nav-toggle {
                display: inline-flex;
            }
            .nav-card {
                position: absolute;
                top: calc(100% + 8px);
                left: 24px;
                right: 24px;
                flex-direction: column;
                align-items: stretch;
                background: #fff;
                border-radius: var(--radius);
                box-shadow: var(--shadow-hover);
                border: 1px solid var(--border);
                padding: 12px;
                z-index: 50;
                display: none;
            }
            .nav-card.open {
                display: flex;
            }
            .nav-link {
                padding: 12px 16px;
                border-radius: var(--radius-sm);
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .features-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .article-content {
                padding: 28px 20px;
                font-size: 15px;
            }
            .page-banner h1 {
                font-size: 28px;
            }
            .article-meta {
                gap: 10px;
                font-size: 13px;
            }
            .page-banner {
                padding: 56px 0 44px;
            }
            .cta-section {
                padding: 64px 0;
            }
            .cta-inner h2 {
                font-size: 26px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .logo {
                font-size: 18px;
            }
            .logo-icon {
                width: 34px;
                height: 34px;
                font-size: 14px;
            }
            .nav-card {
                left: 16px;
                right: 16px;
            }
            .page-banner {
                padding: 48px 0 36px;
            }
            .breadcrumb {
                gap: 4px;
                font-size: 13px;
            }
            .page-banner h1 {
                font-size: 24px;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .cta-section {
                padding: 56px 0;
            }
            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }
            .btn-white,
            .btn-outline {
                width: 100%;
                justify-content: center;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            .article-main {
                padding: 40px 0 48px;
            }
            .related-section,
            .feature-section,
            .faq-section {
                padding: 48px 0;
            }
        }