/* roulang page: index */
:root {
            --primary: #2B6CB0;
            --primary-dark: #1E5B96;
            --primary-50: #F0F6FB;
            --primary-100: #E1EEF7;
            --accent: #D97706;
            --accent-dark: #B45309;
            --success: #0E9F82;
            --error: #DC2626;
            --text: #1A2937;
            --text-secondary: #45586A;
            --text-muted: #6B7C8F;
            --border: #DCE6EF;
            --card-bg: #FFFFFF;
            --page-bg: #F6FAFC;
            --footer-bg: #14293C;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-pill: 999px;
            --shadow-card: 0 1px 2px rgba(16, 44, 84, .05), 0 4px 12px rgba(16, 44, 84, .06);
            --shadow-hover: 0 2px 4px rgba(16, 44, 84, .06), 0 12px 32px rgba(16, 44, 84, .12);
            --shadow-pop: 0 8px 40px rgba(16, 44, 84, .14);
            --font-stack: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-stack);
            background: var(--page-bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color .2s ease;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: 15px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 32px;
            padding-right: 32px;
        }
        @media (max-width: 768px) {
            .container {
                padding-left: 24px;
                padding-right: 24px;
            }
        }
        .section {
            padding: 80px 0;
        }
        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            font-size: 32px;
            font-weight: 700;
            letter-spacing: -0.01em;
            color: var(--text);
            margin-bottom: 8px;
        }
        .section-header p {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .section-header h2 {
                font-size: 26px;
            }
            .section-header p {
                font-size: 15px;
            }
        }

        /* 按钮 */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--primary);
            color: #fff;
            height: 48px;
            padding: 0 28px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 16px;
            transition: all .2s ease;
            border: 1px solid transparent;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(43, 108, 176, .3);
        }
        .btn-primary:active {
            transform: scale(.98);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: #fff;
            color: var(--primary);
            height: 48px;
            padding: 0 28px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 16px;
            border: 1px solid var(--primary);
            transition: all .2s ease;
        }
        .btn-secondary:hover {
            background: var(--primary-50);
            border-color: var(--primary-dark);
        }
        .btn-secondary:active {
            transform: scale(.98);
        }
        .btn-accent {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--accent);
            color: #fff;
            height: 48px;
            padding: 0 28px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 16px;
            transition: all .2s ease;
            border: 1px solid transparent;
        }
        .btn-accent:hover {
            background: var(--accent-dark);
        }
        .btn-accent:active {
            transform: scale(.98);
        }
        .btn-block {
            width: 100%;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid rgba(43, 108, 176, .35);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* 导航 */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            background: rgba(255, 255, 255, .9);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border);
            height: 72px;
        }
        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            padding: 0 32px;
        }
        @media (max-width: 768px) {
            .nav-container {
                padding: 0 20px;
            }
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 600;
            font-size: 18px;
            color: var(--text);
            flex-shrink: 0;
        }
        .nav-logo svg {
            width: 30px;
            height: 30px;
            color: var(--primary);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-pill);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all .2s ease;
        }
        .nav-link:hover {
            background: var(--primary-50);
            color: var(--primary);
        }
        .nav-link.active {
            background: var(--primary-50);
            color: var(--primary);
            font-weight: 600;
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .search-wrap {
            position: relative;
        }
        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            background: var(--page-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            height: 40px;
            padding: 0 12px;
            width: 220px;
            transition: all .2s ease;
        }
        .search-box:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(43, 108, 176, .15);
            background: #fff;
        }
        .search-box i {
            color: var(--text-muted);
            font-size: 13px;
        }
        .search-box input {
            border: none;
            outline: none;
            background: transparent;
            flex: 1;
            font-size: 14px;
            color: var(--text);
        }
        .search-box input::placeholder {
            color: var(--text-muted);
        }
        .kbd {
            background: var(--primary-50);
            border: 1px solid var(--border);
            border-radius: 4px;
            padding: 2px 6px;
            font-size: 11px;
            color: var(--text-muted);
            font-weight: 500;
            letter-spacing: .5px;
            flex-shrink: 0;
        }
        .search-dropdown {
            display: none;
            position: absolute;
            top: 46px;
            left: 0;
            right: 0;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-pop);
            padding: 12px;
            z-index: 50;
        }
        .search-wrap:focus-within .search-dropdown {
            display: block;
        }
        .search-dropdown-item {
            padding: 8px 12px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 8px;
            transition: background .15s;
        }
        .search-dropdown-item:hover {
            background: var(--primary-50);
            color: var(--primary);
        }
        .search-dropdown-item i {
            width: 16px;
            color: var(--text-muted);
        }
        .nav-icon-btn {
            position: relative;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: var(--text-secondary);
            font-size: 16px;
            transition: all .2s;
            border: 1px solid transparent;
        }
        .nav-icon-btn:hover {
            background: var(--primary-50);
            color: var(--primary);
        }
        .tooltip {
            position: absolute;
            bottom: -32px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--text);
            color: #fff;
            font-size: 12px;
            padding: 4px 10px;
            border-radius: 4px;
            white-space: nowrap;
            opacity: 0;
            pointer-events: none;
            transition: opacity .2s;
        }
        .nav-icon-btn:hover .tooltip {
            opacity: 1;
        }
        .hamburger {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--text);
            border: 1px solid var(--border);
        }
        .mobile-menu {
            display: none;
            background: #fff;
            border-bottom: 1px solid var(--border);
            padding: 16px 24px;
            position: fixed;
            top: 72px;
            left: 0;
            right: 0;
            z-index: 99;
            flex-direction: column;
            gap: 8px;
            box-shadow: var(--shadow-card);
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu a {
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            color: var(--text-secondary);
            font-weight: 500;
        }
        .mobile-menu a:hover,
        .mobile-menu a.active {
            background: var(--primary-50);
            color: var(--primary);
        }
        @media (max-width: 1024px) {
            .nav-links,
            .nav-right .search-wrap {
                display: none;
            }
            .hamburger {
                display: inline-flex;
            }
        }

        /* Hero */
        .hero {
            padding: 140px 0 80px;
            background: var(--page-bg);
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -100px;
            right: -80px;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(43, 108, 176, .12) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: 40px;
            left: -60px;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(43, 108, 176, .06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-grid {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 64px;
            align-items: center;
        }
        @media (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .hero {
                padding: 120px 0 56px;
            }
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--primary-50);
            border: 1px solid var(--primary-100);
            color: var(--primary);
            font-size: 13px;
            font-weight: 500;
            letter-spacing: .08em;
            padding: 6px 16px;
            border-radius: var(--radius-pill);
            margin-bottom: 20px;
        }
        .hero h1 {
            font-size: clamp(34px, 4.5vw, 52px);
            font-weight: 700;
            letter-spacing: -0.01em;
            line-height: 1.15;
            color: var(--text);
            margin-bottom: 20px;
        }
        .hero h1 .highlight {
            color: var(--primary);
        }
        .hero-subtitle {
            font-size: 18px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 520px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 28px;
        }
        .hero-trust {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 14px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .hero-trust span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .hero-trust span i {
            color: var(--success);
            font-size: 14px;
        }
        .hero-image {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-hover);
        }
        .hero-image img {
            width: 100%;
            height: auto;
            object-fit: cover;
            border-radius: var(--radius-lg);
            min-height: 340px;
        }
        .hero-glass {
            position: absolute;
            bottom: 20px;
            left: 20px;
            background: rgba(255, 255, 255, .85);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, .6);
            border-radius: var(--radius-md);
            padding: 12px 20px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text);
            box-shadow: var(--shadow-card);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .hero-glass i {
            color: var(--primary);
        }
        .hero-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 56px;
            padding: 24px 32px;
            background: #fff;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border);
        }
        @media (max-width: 768px) {
            .hero-stats {
                grid-template-columns: 1fr;
                gap: 16px;
                padding: 20px 24px;
            }
        }
        .hero-stats div {
            text-align: center;
        }
        .hero-stats .num {
            font-size: 32px;
            font-weight: 700;
            color: var(--primary);
            font-variant-numeric: tabular-nums;
            display: block;
        }
        .hero-stats .label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* 优惠阶梯 */
        .plans-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            align-items: stretch;
        }
        @media (max-width: 1024px) {
            .plans-grid {
                grid-template-columns: 1fr;
                max-width: 480px;
                margin: 0 auto;
            }
        }
        .plan-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 32px 28px;
            display: flex;
            flex-direction: column;
            transition: all .3s ease;
            position: relative;
        }
        .plan-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .plan-card.featured {
            border: 2px solid var(--primary);
            box-shadow: var(--shadow-hover);
            transform: scale(1.02);
        }
        @media (max-width: 1024px) {
            .plan-card.featured {
                transform: none;
            }
        }
        .plan-badge {
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--accent);
            color: #fff;
            font-size: 12px;
            font-weight: 500;
            padding: 4px 16px;
            border-radius: var(--radius-pill);
            white-space: nowrap;
            box-shadow: 0 4px 12px rgba(217, 119, 6, .3);
        }
        .plan-name {
            font-size: 14px;
            color: var(--text-muted);
            letter-spacing: .08em;
            text-transform: uppercase;
            margin-bottom: 8px;
            font-weight: 500;
        }
        .plan-price {
            font-size: 32px;
            font-weight: 700;
            color: var(--text);
            font-variant-numeric: tabular-nums;
            margin: 8px 0 4px;
        }
        .plan-price span {
            font-size: 16px;
            font-weight: 400;
            color: var(--text-muted);
        }
        .plan-original {
            font-size: 14px;
            color: var(--text-muted);
            text-decoration: line-through;
            margin-bottom: 16px;
        }
        .plan-features {
            list-style: none;
            margin: 16px 0 24px;
            flex: 1;
        }
        .plan-features li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 15px;
            color: var(--text-secondary);
            padding: 6px 0;
            line-height: 1.5;
        }
        .plan-features li i {
            color: var(--success);
            background: rgba(14, 159, 130, .1);
            border-radius: 50%;
            width: 20px;
            height: 20px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 10px;
            flex-shrink: 0;
            margin-top: 3px;
        }
        .plan-note {
            text-align: center;
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 12px;
        }

        /* 套餐对比 */
        .compare-wrapper {
            background: #fff;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border);
            overflow-x: auto;
        }
        .compare-table {
            width: 100%;
            min-width: 820px;
            border-collapse: collapse;
        }
        .compare-table th,
        .compare-table td {
            padding: 16px 20px;
            text-align: center;
            border-bottom: 1px solid var(--border);
            font-size: 15px;
        }
        .compare-table th {
            background: var(--primary-50);
            font-weight: 600;
            color: var(--text);
        }
        .compare-table th.plan-name-col {
            background: var(--primary-50);
            color: var(--primary);
            font-size: 17px;
        }
        .compare-table th.featured-col {
            border: 2px solid var(--primary);
            border-bottom: none;
            position: relative;
            background: var(--primary-50);
        }
        .compare-table td.featured-col {
            border: 2px solid var(--primary);
            border-top: none;
            background: var(--primary-50);
        }
        .compare-table tr:last-child td {
            border-bottom: none;
        }
        .compare-table .feature-label {
            text-align: left;
            color: var(--text-secondary);
            font-weight: 500;
        }
        .compare-table .feature-value {
            color: var(--text);
        }
        .compare-table .feature-value i {
            font-size: 14px;
        }
        .compare-table .check {
            color: var(--success);
            background: rgba(14, 159, 130, .1);
            border-radius: 50%;
            width: 22px;
            height: 22px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 10px;
        }
        .compare-table .cross {
            color: var(--text-muted);
            font-size: 16px;
        }
        .compare-table .minus {
            color: var(--text-muted);
            font-size: 16px;
        }
        .compare-table .price-cell {
            font-size: 22px;
            font-weight: 700;
            color: var(--text);
            font-variant-numeric: tabular-nums;
        }
        .compare-table .price-cell span {
            font-size: 14px;
            font-weight: 400;
            color: var(--text-muted);
        }
        .compare-table .table-cta {
            padding: 20px;
        }
        .recommend-tag {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            font-size: 11px;
            font-weight: 500;
            padding: 2px 10px;
            border-radius: var(--radius-pill);
            margin-bottom: 6px;
        }

        /* 限时入口 */
        .promo-box {
            background: #FFF8ED;
            border: 1px dashed var(--accent);
            border-radius: var(--radius-lg);
            padding: 48px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
            flex-wrap: wrap;
        }
        @media (max-width: 768px) {
            .promo-box {
                padding: 32px 24px;
                flex-direction: column;
                text-align: center;
            }
        }
        .promo-left h3 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
        }
        .promo-left p {
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 16px;
        }
        .countdown {
            display: flex;
            align-items: flex-end;
            gap: 8px;
            margin-top: 16px;
        }
        @media (max-width: 768px) {
            .countdown {
                justify-content: center;
            }
        }
        .countdown-group {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .countdown-num {
            width: 48px;
            height: 56px;
            background: #fff;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-card);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: 700;
            color: var(--accent);
            font-variant-numeric: tabular-nums;
            border: 1px solid rgba(217, 119, 6, .2);
        }
        .countdown-label {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 6px;
        }
        .countdown-sep {
            font-size: 24px;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 20px;
            line-height: 1;
        }
        .promo-right {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 12px;
        }
        .promo-note {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 8px;
        }

        /* 资讯 */
        .news-grid {
            display: grid;
            gap: 16px;
        }
        .news-card {
            display: flex;
            align-items: center;
            gap: 20px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 16px;
            transition: all .3s ease;
        }
        .news-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }
        @media (max-width: 640px) {
            .news-card {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }
        }
        .news-thumb {
            width: 120px;
            height: 90px;
            border-radius: var(--radius-md);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--primary-50);
        }
        @media (max-width: 640px) {
            .news-thumb {
                width: 100%;
                height: 140px;
            }
        }
        .news-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .news-content {
            flex: 1;
            min-width: 0;
        }
        .news-category {
            display: inline-block;
            background: var(--primary-50);
            color: var(--primary);
            font-size: 13px;
            font-weight: 500;
            padding: 2px 12px;
            border-radius: var(--radius-pill);
            margin-bottom: 6px;
        }
        .news-content h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text);
            font-variation-ligatures: none;
            line-height: 1.4;
            margin-bottom: 4px;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-card:hover .news-content h3 {
            color: var(--primary);
        }
        .news-content p {
            font-size: 14px;
            color: var(--text-muted);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 6px;
        }
        .news-time {
            font-size: 14px;
            color: var(--text-muted);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .news-time i {
            font-size: 12px;
        }
        .empty-state {
            background: var(--page-bg);
            border: 1px dashed var(--border);
            border-radius: var(--radius-md);
            padding: 48px;
            text-align: center;
            color: var(--text-muted);
        }
        .empty-state i {
            font-size: 32px;
            margin-bottom: 12px;
            opacity: .5;
        }
        .empty-state p {
            font-size: 15px;
        }

        /* FAQ */
        .faq-layout {
            display: grid;
            grid-template-columns: 1fr 1.5fr;
            gap: 48px;
        }
        @media (max-width: 1024px) {
            .faq-layout {
                grid-template-columns: 1fr;
            }
        }
        .faq-left h2 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .faq-left p {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-card);
            padding: 0;
            overflow: hidden;
            transition: box-shadow .2s;
        }
        .faq-item.active {
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-100);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 20px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            transition: color .2s;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            font-size: 14px;
            color: var(--text-muted);
            transition: transform .2s ease, color .2s ease;
            flex-shrink: 0;
            margin-left: 12px;
        }
        .faq-item.active .faq-question i {
            transform: rotate(45deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .2s ease;
            padding: 0 20px;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding-bottom: 18px;
        }
        .faq-answer p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* 咨询表单 */
        .contact-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
        }
        @media (max-width: 1024px) {
            .contact-layout {
                grid-template-columns: 1fr;
            }
        }
        .contact-info h2 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .contact-info>p {
            font-size: 16px;
            color: var(--text-secondary);
            margin-bottom: 24px;
        }
        .contact-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            margin-bottom: 16px;
            font-size: 15px;
            color: var(--text-secondary);
        }
        .contact-item i {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--primary-50);
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 11px;
            flex-shrink: 0;
            margin-top: 2px;
        }
        .contact-promise {
            list-style: none;
            margin-top: 24px;
        }
        .contact-promise li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--text-secondary);
            padding: 4px 0;
        }
        .contact-promise li i {
            color: var(--success);
            font-size: 14px;
            background: rgba(14, 159, 130, .1);
            border-radius: 50%;
            width: 22px;
            height: 22px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 10px;
            flex-shrink: 0;
        }
        .contact-form-card {
            background: #fff;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border);
            padding: 32px;
        }
        @media (max-width: 640px) {
            .contact-form-card {
                padding: 24px;
            }
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-label {
            display: block;
            font-size: 14px;
            font-weight: 500;
            color: var(--text);
            margin-bottom: 6px;
        }
        .form-label .required {
            color: var(--error);
            margin-left: 2px;
        }
        .form-input {
            width: 100%;
            height: 44px;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 0 14px;
            font-size: 15px;
            color: var(--text);
            background: #fff;
            transition: all .2s;
        }
        .form-input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(43, 108, 176, .15);
        }
        .form-textarea {
            width: 100%;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 12px 14px;
            font-size: 15px;
            color: var(--text);
            resize: vertical;
            min-height: 100px;
            transition: all .2s;
        }
        .form-textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(43, 108, 176, .15);
        }
        .form-privacy {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 16px;
            text-align: center;
        }
        .btn-loading {
            opacity: .7;
            pointer-events: none;
        }

        /* 页脚 */
        .site-footer {
            background: var(--footer-bg);
            color: #fff;
            padding: 64px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 2fr 2fr 3fr;
            gap: 40px;
            margin-bottom: 48px;
        }
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 640px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        .footer-brand .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
        }
        .footer-brand .footer-logo svg {
            width: 28px;
            height: 28px;
            color: #fff;
        }
        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, .7);
            line-height: 1.6;
            max-width: 260px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
            margin-top: 16px;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, .1);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 14px;
            transition: all .2s;
        }
        .footer-social a:hover {
            background: var(--primary);
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: .02em;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            padding: 5px 0;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, .7);
            transition: color .2s;
        }
        .footer-col ul li a:hover {
            color: #9BC2E8;
        }
        .footer-contact li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 14px;
            color: rgba(255, 255, 255, .7);
            padding: 6px 0;
        }
        .footer-contact li i {
            margin-top: 4px;
            color: rgba(255, 255, 255, .5);
            font-size: 13px;
            width: 16px;
            flex-shrink: 0;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .1);
            padding-top: 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, .6);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, .7);
        }
        .footer-bottom a:hover {
            color: #9BC2E8;
        }
        @media (max-width: 640px) {
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #2B6CB0;
            --primary-dark: #1E5B96;
            --primary-50: #F0F6FB;
            --primary-100: #E1EEF7;
            --accent: #D97706;
            --accent-dark: #B45309;
            --success: #0E9F82;
            --error: #DC2626;
            --text: #1A2937;
            --text-secondary: #45586A;
            --text-muted: #6B7C8F;
            --border: #DCE6EF;
            --card-bg: #FFFFFF;
            --page-bg: #F6FAFC;
            --footer-bg: #14293C;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-card: 0 1px 2px rgba(16, 44, 84, .05), 0 4px 12px rgba(16, 44, 84, .06);
            --shadow-hover: 0 2px 4px rgba(16, 44, 84, .06), 0 12px 32px rgba(16, 44, 84, .12);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--page-bg);
            -webkit-font-smoothing: antialiased;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 32px;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        img {
            max-width: 100%;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }

        /* Header */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 72px;
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            z-index: 100;
        }
        .header-inner {
            display: flex;
            align-items: center;
            height: 72px;
            gap: 32px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 600;
            font-size: 20px;
            color: var(--text);
            white-space: nowrap;
        }
        .logo svg {
            width: 28px;
            height: 28px;
            color: var(--primary);
            flex-shrink: 0;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            margin-left: 8px;
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all .2s ease;
        }
        .nav-link:hover {
            background: var(--primary-50);
            color: var(--primary);
        }
        .nav-link.active {
            background: var(--primary-50);
            color: var(--primary);
            font-weight: 600;
        }
        .header-right {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-left: auto;
        }
        .search-box {
            position: relative;
            display: flex;
            align-items: center;
        }
        .search-box input {
            width: 220px;
            height: 40px;
            padding: 0 44px 0 38px;
            border-radius: 8px;
            border: 1px solid var(--border);
            background: #fff;
            font-size: 14px;
            color: var(--text);
            outline: none;
            transition: all .2s ease;
        }
        .search-box input::placeholder {
            color: var(--text-muted);
        }
        .search-box input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(43, 108, 176, .18);
        }
        .search-box .fa-search {
            position: absolute;
            left: 14px;
            font-size: 14px;
            color: var(--text-muted);
            pointer-events: none;
        }
        .search-box kbd {
            position: absolute;
            right: 10px;
            padding: 2px 6px;
            font-size: 12px;
            color: var(--text-muted);
            background: var(--primary-50);
            border-radius: 4px;
            border: 1px solid var(--border);
            font-family: inherit;
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 20px;
            color: var(--text);
            padding: 8px;
            cursor: pointer;
            border-radius: 8px;
            transition: background .2s;
        }
        .mobile-toggle:hover {
            background: var(--primary-50);
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 44px;
            padding: 0 24px;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 500;
            border: 1px solid transparent;
            cursor: pointer;
            transition: all .2s ease;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 2px 8px rgba(43, 108, 176, .25);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 4px 16px rgba(43, 108, 176, .32);
        }
        .btn-primary:active {
            transform: scale(.98);
        }
        .btn-outline {
            background: #fff;
            border-color: var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary-50);
        }
        .btn-outline:active {
            transform: scale(.98);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 2px 8px rgba(217, 119, 6, .25);
        }
        .btn-accent:hover {
            background: var(--accent-dark);
            box-shadow: 0 4px 16px rgba(217, 119, 6, .32);
        }
        .btn-accent:active {
            transform: scale(.98);
        }
        .btn-sm {
            height: 36px;
            padding: 0 18px;
            font-size: 14px;
        }
        .btn-lg {
            height: 52px;
            padding: 0 36px;
            font-size: 16px;
        }
        .btn:focus-visible {
            outline: none;
            box-shadow: 0 0 0 3px rgba(43, 108, 176, .35);
        }

        /* Hero */
        .hero {
            position: relative;
            padding: 140px 0 70px;
            background: var(--page-bg);
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -120px;
            right: -80px;
            width: 450px;
            height: 450px;
            background: radial-gradient(circle, rgba(43, 108, 176, .12), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-grid {
            position: relative;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            border-radius: 999px;
            background: var(--primary-50);
            color: var(--primary);
            font-size: 13px;
            font-weight: 500;
            letter-spacing: .08em;
            margin-bottom: 20px;
        }
        .hero-title {
            font-size: clamp(30px, 4vw, 44px);
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -.01em;
            color: var(--text);
            margin-bottom: 18px;
        }
        .hero-title .highlight {
            color: var(--primary);
        }
        .hero-subtitle {
            font-size: 17px;
            line-height: 1.7;
            color: var(--text-secondary);
            max-width: 520px;
            margin-bottom: 30px;
        }
        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            margin-bottom: 24px;
        }
        .hero-trust {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 14px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .hero-trust span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .hero-trust i {
            color: var(--success);
            font-size: 13px;
        }
        .hero-image {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }
        .hero-image img {
            width: 100%;
            height: 360px;
            object-fit: cover;
        }
        .hero-float-tag {
            position: absolute;
            left: 20px;
            bottom: 20px;
            padding: 10px 18px;
            border-radius: 12px;
            background: rgba(255, 255, 255, .8);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            box-shadow: 0 4px 16px rgba(16, 44, 84, .12);
            font-size: 13px;
            font-weight: 500;
            color: var(--text);
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 50px;
            padding-top: 30px;
            border-top: 1px solid var(--border);
        }
        .hero-stat {
            text-align: left;
        }
        .hero-stat .num {
            font-size: 28px;
            font-weight: 700;
            color: var(--text);
            font-variant-numeric: tabular-nums;
        }
        .hero-stat .label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 2px;
        }

        /* Sections */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: #fff;
        }
        .section-head {
            text-align: center;
            margin-bottom: 50px;
        }
        .section-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 14px;
            border-radius: 999px;
            background: var(--primary-50);
            color: var(--primary);
            font-size: 13px;
            font-weight: 500;
            letter-spacing: .08em;
            margin-bottom: 14px;
        }
        .section-title {
            font-size: 32px;
            font-weight: 700;
            letter-spacing: -.01em;
            color: var(--text);
            margin-bottom: 12px;
            line-height: 1.3;
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.7;
        }

        /* Cards */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .card-grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 28px;
            transition: all .25s ease;
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
            border-color: var(--primary-100);
        }
        .card-img {
            border-radius: var(--radius-md);
            overflow: hidden;
            margin-bottom: 20px;
        }
        .card-img img {
            width: 100%;
            height: 160px;
            object-fit: cover;
            transition: transform .3s ease;
        }
        .card:hover .card-img img {
            transform: scale(1.04);
        }
        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: 12px;
            background: var(--primary-50);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 20px;
            margin-bottom: 18px;
        }
        .card-title {
            font-size: 19px;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--text);
        }
        .card-text {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Split sections */
        .split-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .split-media {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }
        .split-media img {
            width: 100%;
            height: 340px;
            object-fit: cover;
        }
        .split-content .split-label {
            font-size: 13px;
            font-weight: 500;
            letter-spacing: .08em;
            color: var(--primary);
            text-transform: uppercase;
            margin-bottom: 10px;
        }
        .split-content h3 {
            font-size: 26px;
            font-weight: 700;
            line-height: 1.35;
            margin-bottom: 16px;
            color: var(--text);
        }
        .split-content p {
            font-size: 16px;
            line-height: 1.75;
            color: var(--text-secondary);
            margin-bottom: 16px;
        }
        .split-list {
            list-style: none;
            margin-top: 14px;
        }
        .split-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 10px;
        }
        .split-list i {
            color: var(--success);
            margin-top: 5px;
            font-size: 14px;
            flex-shrink: 0;
        }

        /* Timeline */
        .timeline {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 10px;
        }
        .timeline-item {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 28px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            position: relative;
            transition: all .25s ease;
        }
        .timeline-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }
        .timeline-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: var(--primary-50);
            color: var(--primary);
            font-weight: 700;
            font-size: 16px;
            margin-bottom: 16px;
        }
        .timeline-item h4 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text);
        }
        .timeline-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* FAQ */
        .faq-wrap {
            max-width: 820px;
            margin: 0 auto;
        }
        .faq-item {
            background: #fff;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            margin-bottom: 12px;
            transition: box-shadow .2s ease;
        }
        .faq-item:hover {
            box-shadow: var(--shadow-hover);
        }
        .faq-item.open {
            box-shadow: var(--shadow-hover);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            transition: color .2s;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question .faq-icon {
            position: relative;
            width: 28px;
            height: 28px;
            border-radius: 6px;
            background: var(--primary-50);
            color: var(--primary);
            font-size: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: transform .25s ease, background .2s;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            background: var(--primary);
            color: #fff;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .25s ease;
            padding: 0 24px;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-answer p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            border-top: 1px solid var(--border);
            padding-top: 16px;
        }

        /* CTA */
        .cta-section {
            padding: 80px 0;
            background: var(--primary-50);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            bottom: -100px;
            left: 10%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(43, 108, 176, .08), transparent 70%);
            border-radius: 50%;
        }
        .cta-box {
            position: relative;
            text-align: center;
            max-width: 720px;
            margin: 0 auto;
        }
        .cta-box h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 14px;
            line-height: 1.3;
        }
        .cta-box p {
            font-size: 17px;
            color: var(--text-secondary);
            margin-bottom: 30px;
            line-height: 1.7;
        }
        .cta-actions {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background: var(--footer-bg);
            color: rgba(255, 255, 255, .85);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 2fr 2fr 3fr;
            gap: 40px;
            padding-bottom: 40px;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
        }
        .footer-logo svg {
            width: 28px;
            height: 28px;
            color: #7AB0DE;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, .7);
            margin-bottom: 20px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 8px;
            background: rgba(255, 255, 255, .08);
            color: rgba(255, 255, 255, .8);
            transition: all .2s ease;
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, .65);
            transition: all .2s ease;
        }
        .footer-col ul li a:hover {
            color: #7AB0DE;
        }
        .footer-contact li {
            font-size: 14px;
            color: rgba(255, 255, 255, .65);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-contact i {
            color: #7AB0DE;
            width: 16px;
            text-align: center;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .1);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: rgba(255, 255, 255, .5);
            flex-wrap: wrap;
            gap: 10px;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .card-grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .timeline {
                grid-template-columns: repeat(2, 1fr);
            }
            .search-box input {
                width: 160px;
            }
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 20px;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                padding: 16px 20px;
                border-bottom: 1px solid var(--border);
                box-shadow: 0 8px 24px rgba(16, 44, 84, .06);
                margin: 0;
                gap: 4px;
            }
            .nav-links.active {
                display: flex;
            }
            .nav-link {
                width: 100%;
                border-radius: 8px;
                padding: 12px 16px;
            }
            .mobile-toggle {
                display: block;
            }
            .search-box {
                display: none;
            }
            .header-right .btn {
                font-size: 14px;
                padding: 0 16px;
            }
            .hero {
                padding: 120px 0 50px;
            }
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .hero-image img {
                height: 260px;
            }
            .hero-stats {
                gap: 24px;
                flex-wrap: wrap;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .card-grid-4 {
                grid-template-columns: 1fr;
            }
            .split-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .split-media img {
                height: 240px;
            }
            .timeline {
                grid-template-columns: 1fr;
            }
            .section {
                padding: 56px 0;
            }
            .section-title {
                font-size: 26px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
            .footer-bottom {
                flex-direction: column;
                justify-content: center;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .header-right .btn {
                display: none;
            }
            .hero-title {
                font-size: 28px;
            }
            .hero-actions .btn {
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .hero-stats {
                gap: 16px;
            }
            .hero-stat .num {
                font-size: 22px;
            }
            .cta-actions .btn {
                width: 100%;
            }
        }

/* roulang page: article */
:root {
            --primary: #2B6CB0;
            --primary-dark: #1E5B96;
            --primary-50: #F0F6FB;
            --primary-100: #E1EEF7;
            --accent: #D97706;
            --accent-dark: #B45309;
            --success: #0E9F82;
            --danger: #DC2626;
            --text-main: #1A2937;
            --text-secondary: #45586A;
            --text-muted: #6B7C8F;
            --border: #DCE6EF;
            --card-bg: #FFFFFF;
            --page-bg: #F6FAFC;
            --footer-bg: #14293C;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-card: 0 1px 2px rgba(16,44,84,.05), 0 4px 12px rgba(16,44,84,.06);
            --shadow-hover: 0 2px 4px rgba(16,44,84,.06), 0 12px 32px rgba(16,44,84,.12);
            --shadow-pop: 0 8px 40px rgba(16,44,84,.14);
            --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }

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

        html { scroll-behavior: smooth; }

        body {
            font-family: var(--font-sans);
            background: var(--page-bg);
            color: var(--text-main);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

        a { color: var(--primary); text-decoration: none; transition: color .2s; }

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

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

        /* ===== Header ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            height: 72px;
            background: rgba(255,255,255,.9);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            gap: 24px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 600;
            font-size: 18px;
            color: var(--text-main);
            white-space: nowrap;
        }

        .logo svg {
            width: 28px;
            height: 28px;
            color: var(--primary);
            flex-shrink: 0;
        }

        .logo span { letter-spacing: -0.01em; }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 2px;
        }

        .nav-link {
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: background .2s, color .2s;
        }

        .nav-link:hover {
            background: var(--primary-50);
            color: var(--primary);
        }

        .nav-link.active {
            background: var(--primary-50);
            color: var(--primary);
            font-weight: 600;
        }

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

        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            width: 220px;
            height: 44px;
            padding: 0 12px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            transition: border-color .2s, box-shadow .2s;
        }

        .search-box:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(43,108,176,.15);
        }

        .search-box i { color: var(--text-muted); font-size: 13px; }

        .search-box input {
            flex: 1;
            border: none;
            outline: none;
            font-size: 13px;
            color: var(--text-main);
            background: transparent;
        }

        .search-box input::placeholder { color: var(--text-muted); }

        .kbd {
            padding: 2px 6px;
            background: var(--primary-50);
            border: 1px solid var(--primary-100);
            border-radius: 4px;
            font-size: 11px;
            color: var(--text-muted);
            font-family: ui-monospace, monospace;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 44px;
            padding: 0 24px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 500;
            border: none;
            cursor: pointer;
            transition: background .2s, transform .15s, box-shadow .2s, border-color .2s;
        }

        .btn:focus-visible {
            outline: none;
            box-shadow: 0 0 0 3px rgba(43,108,176,.35);
        }

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

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

        .btn-primary:active {
            transform: scale(.98);
        }

        .btn-outline {
            background: #fff;
            border: 1px solid var(--primary);
            color: var(--primary);
        }

        .btn-outline:hover {
            background: var(--primary-50);
            color: var(--primary-dark);
        }

        .btn-accent {
            background: var(--accent);
            color: #fff;
        }

        .btn-accent:hover {
            background: var(--accent-dark);
            color: #fff;
        }

        .btn-sm { height: 36px; padding: 0 18px; font-size: 13px; }

        .btn-lg { height: 52px; padding: 0 36px; font-size: 16px; }

        .mobile-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            background: #fff;
            color: var(--text-main);
            font-size: 16px;
            cursor: pointer;
            align-items: center;
            justify-content: center;
        }

        .mobile-toggle:hover { background: var(--primary-50); }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 72px;
            left: 0;
            right: 0;
            z-index: 99;
            background: #fff;
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-pop);
            padding: 16px 24px 24px;
        }

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

        .mobile-menu .nav-links {
            flex-direction: column;
            align-items: stretch;
            gap: 4px;
            margin-bottom: 16px;
        }

        .mobile-menu .nav-link {
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 15px;
        }

        .mobile-search {
            display: flex;
            align-items: center;
            gap: 8px;
            height: 44px;
            padding: 0 12px;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            margin-bottom: 16px;
            background: var(--page-bg);
        }

        .mobile-search i { color: var(--text-muted); }

        .mobile-search input {
            flex: 1;
            border: none;
            outline: none;
            background: transparent;
            font-size: 14px;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-wrap {
            padding: 32px 0 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--text-muted);
            transition: color .2s;
        }

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

        .breadcrumb .sep { color: var(--border); }

        .breadcrumb .current {
            color: var(--text-secondary);
            max-width: 260px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        /* ===== Article Main ===== */
        .article-main {
            background: #fff;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            padding: 48px;
            margin-top: 24px;
            margin-bottom: 32px;
        }

        .article-main h1 {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.35;
            letter-spacing: -0.01em;
            color: var(--text-main);
            margin-bottom: 20px;
        }

        .article-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px 16px;
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 28px;
            padding-bottom: 24px;
            border-bottom: 1px solid var(--border);
        }

        .meta-badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 14px;
            background: var(--primary-50);
            color: var(--primary);
            border-radius: 999px;
            font-size: 13px;
            font-weight: 500;
        }

        .meta-dot {
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: var(--border);
        }

        .article-cover {
            border-radius: var(--radius-md);
            overflow: hidden;
            margin-bottom: 32px;
        }

        .article-cover img {
            width: 100%;
            max-height: 480px;
            object-fit: cover;
        }

        .article-body {
            max-width: 720px;
            margin: 0 auto;
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-main);
        }

        .article-body p {
            margin-bottom: 24px;
        }

        .article-body h2 {
            font-size: 24px;
            font-weight: 700;
            margin: 40px 0 16px;
            color: var(--text-main);
            line-height: 1.4;
        }

        .article-body h3 {
            font-size: 19px;
            font-weight: 600;
            margin: 32px 0 12px;
            color: var(--text-main);
            line-height: 1.4;
        }

        .article-body ul,
        .article-body ol {
            margin: 0 0 24px;
            padding-left: 24px;
        }

        .article-body li {
            margin-bottom: 8px;
        }

        .article-body blockquote {
            border-left: 3px solid var(--primary);
            background: var(--primary-50);
            padding: 16px 20px;
            margin: 24px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: normal;
        }

        .article-body img {
            border-radius: var(--radius-md);
            margin: 24px 0;
            width: 100%;
        }

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 15px;
        }

        .article-body table th {
            background: var(--primary-50);
            font-weight: 600;
            text-align: left;
            padding: 12px 16px;
            border: 1px solid var(--border);
        }

        .article-body table td {
            padding: 10px 16px;
            border: 1px solid var(--border);
        }

        .article-body table tr:nth-child(even) {
            background: #f8fbfd;
        }

        .article-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .article-bottom {
            max-width: 720px;
            margin: 8px auto 0;
            padding-top: 32px;
            border-top: 1px solid var(--border);
        }

        .article-tags {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 24px;
        }

        .article-tags span {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 6px 14px;
            background: var(--primary-50);
            border: 1px solid var(--primary-100);
            border-radius: 999px;
            font-size: 13px;
            color: var(--primary);
            font-weight: 500;
        }

        .back-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            color: var(--text-muted);
            transition: color .2s;
        }

        .back-link:hover { color: var(--primary); }

        /* ===== Empty State ===== */
        .empty-state {
            text-align: center;
            padding: 60px 24px;
        }

        .empty-state .empty-icon {
            font-size: 48px;
            color: var(--border);
            margin-bottom: 16px;
        }

        .empty-state p {
            font-size: 18px;
            color: var(--text-muted);
            margin-bottom: 24px;
        }

        /* ===== Related Posts ===== */
        .related-section {
            padding: 48px 0 64px;
        }

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

        .section-header .eyebrow {
            display: inline-block;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: .08em;
            color: var(--primary);
            background: var(--primary-50);
            padding: 4px 14px;
            border-radius: 999px;
            margin-bottom: 12px;
        }

        .section-header h2 {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: -0.01em;
            line-height: 1.3;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .related-card {
            display: flex;
            gap: 16px;
            background: #fff;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-card);
            padding: 16px;
            border: 1px solid transparent;
            transition: box-shadow .25s, transform .25s, border-color .25s;
        }

        .related-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
            border-color: var(--primary-100);
        }

        .related-card .thumb {
            width: 96px;
            height: 72px;
            border-radius: 8px;
            object-fit: cover;
            flex-shrink: 0;
        }

        .related-card .info {
            flex: 1;
            min-width: 0;
        }

        .related-card .info h3 {
            font-size: 15px;
            font-weight: 600;
            line-height: 1.4;
            color: var(--text-main);
            margin-bottom: 6px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-card .info h3 a { color: inherit; }

        .related-card .info h3 a:hover { color: var(--primary); }

        .related-card .info .date {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* ===== CTA ===== */
        .site-cta {
            background: var(--footer-bg);
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
            margin-bottom: 64px;
            position: relative;
            overflow: hidden;
        }

        .site-cta::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(43,108,176,.25);
            filter: blur(40px);
        }

        .site-cta h2 {
            font-size: 28px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
        }

        .site-cta p {
            color: rgba(255,255,255,.8);
            font-size: 15px;
            margin-bottom: 28px;
            position: relative;
            z-index: 1;
        }

        .site-cta .btn {
            position: relative;
            z-index: 1;
        }

        .site-cta-trust {
            display: flex;
            justify-content: center;
            gap: 24px;
            margin-top: 20px;
            font-size: 13px;
            color: rgba(255,255,255,.6);
            position: relative;
            z-index: 1;
            flex-wrap: wrap;
        }

        .site-cta-trust span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .site-cta-trust i {
            color: var(--success);
            font-size: 12px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--footer-bg);
            color: rgba(255,255,255,.85);
            padding: 64px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 2fr 2fr 3fr;
            gap: 40px;
            padding-bottom: 48px;
            border-bottom: 1px solid rgba(255,255,255,.1);
        }

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }

        .footer-logo svg {
            width: 28px;
            height: 28px;
            color: #7eb8e6;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255,255,255,.7);
            margin-bottom: 20px;
        }

        .footer-social {
            display: flex;
            gap: 12px;
        }

        .footer-social a {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            background: rgba(255,255,255,.08);
            color: rgba(255,255,255,.8);
            font-size: 14px;
            transition: background .2s, color .2s;
        }

        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
        }

        .footer-col li {
            margin-bottom: 10px;
        }

        .footer-col a {
            color: rgba(255,255,255,.7);
            font-size: 14px;
            transition: color .2s;
        }

        .footer-col a:hover {
            color: #7eb8e6;
        }

        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: rgba(255,255,255,.7);
        }

        .footer-contact i {
            color: var(--primary);
            width: 16px;
            text-align: center;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            font-size: 13px;
            color: rgba(255,255,255,.5);
            flex-wrap: wrap;
            gap: 8px;
        }

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

            .search-box { width: 180px; }

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

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

        @media (max-width: 768px) {
            .nav-links { display: none; }

            .header-actions .search-box { display: none; }

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

            .mobile-toggle { display: flex; }

            .article-main { padding: 32px 24px; }

            .article-main h1 { font-size: 26px; }

            .article-body { font-size: 15px; }

            .site-cta { padding: 40px 24px; }

            .site-cta h2 { font-size: 24px; }

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

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

        @media (max-width: 520px) {
            .container { padding: 0 16px; }

            .article-main { padding: 24px 16px; border-radius: 12px; }

            .breadcrumb { font-size: 12px; }

            .breadcrumb .current { max-width: 160px; }

            .article-main h1 { font-size: 22px; }

            .article-meta { gap: 6px 12px; font-size: 13px; }

            .section-header h2 { font-size: 24px; }

            .related-card .thumb { width: 80px; height: 60px; }

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

            .site-cta-trust { flex-direction: column; gap: 8px; }
        }