/* roulang page: index */
:root {
            --primary: #0F8A7D;
            --primary-dark: #0B6B60;
            --primary-light: rgba(15, 138, 125, .12);
            --accent: #F26B38;
            --accent-hover: #D9551F;
            --bg: #F7F5F2;
            --ink: #1F2A28;
            --ink-dark: #0E1514;
            --deep: #14201F;
            --border: #E4E0DA;
            --muted: #6B7573;
            --white: #FFFFFF;
            --shadow-card: 0 2px 8px rgba(20, 32, 31, .06), 0 12px 32px rgba(20, 32, 31, .08);
            --shadow-hover: 0 16px 40px rgba(20, 32, 31, .14);
            --radius: 14px;
            --radius-sm: 10px;
            --transition: .2s ease;
            --container-max: 1200px;
            --section-padding: 88px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--ink);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            display: block;
            border: 0;
        }

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

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

        ul,
        ol {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5 {
            margin: 0;
            font-weight: 800;
            line-height: 1.25;
            color: var(--ink-dark);
        }

        p {
            margin: 0;
        }

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

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

        .section-head {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-bottom: 40px;
        }

        .section-bar {
            display: block;
            width: 6px;
            height: 36px;
            background: var(--accent);
            border-radius: 3px;
            flex-shrink: 0;
        }

        .section-head h2 {
            font-size: 30px;
            font-weight: 800;
            letter-spacing: -0.5px;
        }

        .section-sub {
            font-size: 15px;
            color: var(--muted);
            margin-top: 6px;
        }

        .grid-x {
            margin-left: -12px;
            margin-right: -12px;
        }

        .cell {
            padding-left: 12px;
            padding-right: 12px;
        }

        /* ========== 按钮 ========== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 700;
            border: 2px solid transparent;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
            line-height: 1.2;
            white-space: nowrap;
        }

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

        .btn-accent:hover {
            background: var(--accent-hover);
            color: var(--white);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(242, 107, 56, .35);
        }

        .btn-accent:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(242, 107, 56, .2);
        }

        .btn-outline {
            border-color: var(--primary);
            color: var(--primary);
            background: transparent;
        }

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

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

        .btn-block {
            width: 100%;
        }

        .btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        /* ========== 导航 ========== */
        .site-header {
            background: var(--deep);
            padding: 14px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, .18);
        }

        .nav-panel {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--white);
            font-size: 20px;
            font-weight: 900;
            letter-spacing: -0.3px;
            text-decoration: none;
            line-height: 1.2;
        }

        .brand:hover {
            color: var(--white);
        }

        .brand-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }

        .nav-card {
            display: inline-block;
            background: rgba(255, 255, 255, .08);
            color: rgba(255, 255, 255, .82);
            padding: 10px 18px;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 500;
            text-decoration: none;
            transition: all var(--transition);
            border-bottom: 3px solid transparent;
            line-height: 1.3;
        }

        .nav-card:hover {
            background: rgba(15, 138, 125, .28);
            color: var(--white);
            transform: translateY(-1px);
        }

        .nav-card.active {
            border-bottom-color: var(--accent);
            color: var(--white);
            background: rgba(15, 138, 125, .22);
        }

        .nav-cta {
            flex-shrink: 0;
        }

        .nav-toggle {
            display: none;
            background: transparent;
            border: 1px solid rgba(255, 255, 255, .2);
            border-radius: 8px;
            width: 42px;
            height: 42px;
            color: var(--white);
            font-size: 20px;
            cursor: pointer;
            align-items: center;
            justify-content: center;
            transition: all var(--transition);
        }

        .nav-toggle:hover {
            background: rgba(255, 255, 255, .1);
        }

        .nav-toggle:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        /* ========== Hero ========== */
        .hero {
            position: relative;
            min-height: 90vh;
            display: flex;
            align-items: center;
            padding: 80px 0;
            overflow: hidden;
            background: var(--deep);
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(105deg, rgba(20, 32, 31, .94) 20%, rgba(20, 32, 31, .72) 60%, rgba(20, 32, 31, .45) 100%);
        }

        .hero-content {
            position: relative;
            z-index: 2;
            width: 100%;
        }

        .hero-inner {
            display: flex;
            align-items: center;
            gap: 60px;
        }

        .hero-left {
            flex: 1.1;
        }

        .hero-tagline {
            display: inline-block;
            background: rgba(15, 138, 125, .2);
            color: #6FE0D0;
            font-size: 13px;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 999px;
            margin-bottom: 24px;
            letter-spacing: .3px;
        }

        .hero-left h1 {
            font-size: 38px;
            font-weight: 900;
            color: var(--white);
            line-height: 1.25;
            letter-spacing: -0.5px;
            margin-bottom: 20px;
        }

        .hero-sub {
            font-size: 18px;
            color: rgba(255, 255, 255, .8);
            line-height: 1.6;
            margin-bottom: 32px;
            max-width: 540px;
        }

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

        .hero-right {
            flex: 0.9;
        }

        .metrics-panel {
            background: rgba(20, 32, 31, .82);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, .12);
            border-radius: 16px;
            padding: 32px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, .3);
        }

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

        .metric-item {
            padding: 10px 0;
        }

        .metric-value {
            font-family: 'Roboto Mono', 'Courier New', monospace;
            font-size: 28px;
            font-weight: 700;
            color: var(--white);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .metric-value .trend-up {
            color: var(--accent);
            font-size: 14px;
        }

        .metric-value .trend-down {
            color: #6FE0D0;
            font-size: 14px;
        }

        .metric-value.highlight {
            color: var(--accent);
        }

        .metric-label {
            font-size: 12px;
            color: #B8C4C2;
            margin-top: 6px;
            letter-spacing: .4px;
        }

        .metric-divider {
            border: none;
            border-top: 1px solid rgba(255, 255, 255, .08);
            margin: 20px 0 0;
        }

        /* ========== 资讯卡片 ========== */
        .section-latest {
            background: var(--bg);
        }

        .post-grid {
            display: flex;
            flex-wrap: wrap;
        }

        .post-col {
            margin-bottom: 24px;
        }

        .post-card {
            background: var(--white);
            border-radius: var(--radius);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            height: 100%;
            display: flex;
            flex-direction: column;
            transition: transform var(--transition), box-shadow var(--transition);
        }

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

        .post-thumb {
            position: relative;
            background: #e8e5e0;
            aspect-ratio: 16 / 9;
            overflow: hidden;
        }

        .post-thumb::after {
            content: "📊";
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 32px;
            color: #c9c4bc;
        }

        .post-thumb img {
            position: relative;
            z-index: 1;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }

        .post-card:hover .post-thumb img {
            transform: scale(1.04);
        }

        .post-content {
            padding: 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .badge {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary-dark);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            margin-bottom: 14px;
            align-self: flex-start;
        }

        .post-title {
            font-size: 18px;
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 12px;
        }

        .post-title a {
            color: var(--ink-dark);
            transition: color var(--transition);
        }

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

        .post-excerpt {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 18px;
            flex: 1;
        }

        .post-date {
            font-size: 12px;
            color: var(--muted);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .date-icon {
            display: inline-block;
            width: 14px;
            height: 14px;
            border: 1.5px solid var(--muted);
            border-radius: 3px;
            position: relative;
        }

        .date-icon::before {
            content: "";
            position: absolute;
            top: -4px;
            left: 2px;
            right: 2px;
            height: 2px;
            background: var(--muted);
        }

        .empty-state {
            width: 100%;
            text-align: center;
            padding: 60px 20px;
            background: var(--white);
            border-radius: var(--radius);
            box-shadow: var(--shadow-card);
        }

        .empty-icon {
            font-size: 36px;
            color: var(--primary);
            display: block;
            margin-bottom: 12px;
        }

        .empty-state p {
            color: var(--muted);
            font-size: 15px;
        }

        /* ========== 服务矩阵 ========== */
        .section-services {
            background: var(--white);
        }

        .services-grid {
            display: flex;
            flex-wrap: wrap;
            margin: 0 -12px;
        }

        .service-col {
            padding: 0 12px;
            margin-bottom: 24px;
        }

        .service-col-main {
            flex: 0 0 50%;
            max-width: 50%;
        }

        .service-col-normal {
            flex: 0 0 25%;
            max-width: 25%;
        }

        .service-card {
            background: var(--white);
            border-radius: var(--radius);
            box-shadow: var(--shadow-card);
            padding: 28px;
            height: 100%;
            display: flex;
            flex-direction: column;
            transition: transform var(--transition), box-shadow var(--transition);
            border: 1px solid transparent;
        }

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

        .service-card.featured {
            background: linear-gradient(135deg, var(--deep), #1e3531);
            color: #d4dedb;
        }

        .service-card.featured .service-title {
            color: var(--white);
        }

        .service-card.featured .service-desc {
            color: #B8C4C2;
        }

        .service-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--primary);
            margin-bottom: 20px;
        }

        .service-card.featured .service-icon {
            background: rgba(255, 255, 255, .12);
            color: #6FE0D0;
        }

        .service-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--ink-dark);
        }

        .service-desc {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.7;
            flex: 1;
            margin-bottom: 20px;
        }

        .service-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap var(--transition);
        }

        .service-link:hover {
            gap: 8px;
            color: var(--primary-dark);
        }

        /* ========== 结果对比 ========== */
        .section-compare {
            background: var(--bg);
        }

        .compare-wrap {
            display: flex;
            align-items: center;
            gap: 60px;
        }

        .compare-left {
            flex: 1;
        }

        .compare-left h2 {
            font-size: 30px;
            margin-bottom: 16px;
            letter-spacing: -0.4px;
        }

        .compare-left p {
            color: var(--muted);
            margin-bottom: 28px;
            line-height: 1.8;
        }

        .check-list li {
            display: flex;
            gap: 12px;
            align-items: flex-start;
            margin-bottom: 14px;
            font-size: 15px;
            color: var(--ink);
        }

        .check-list li::before {
            content: "✓";
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 12px;
            font-weight: 700;
            flex-shrink: 0;
            margin-top: 2px;
        }

        .compare-right {
            flex: 1;
        }

        .compare-card {
            background: var(--white);
            border-radius: var(--radius);
            box-shadow: var(--shadow-card);
            padding: 24px;
            overflow: hidden;
        }

        .compare-row {
            display: grid;
            grid-template-columns: 1fr 1fr 1.2fr;
            padding: 14px 8px;
            border-bottom: 1px solid var(--border);
            font-size: 14px;
            align-items: center;
        }

        .compare-row:last-child {
            border-bottom: none;
        }

        .compare-head {
            font-weight: 700;
            color: var(--ink-dark);
            background: var(--bg);
            border-radius: 8px;
            border-bottom: none;
            padding: 12px 8px;
        }

        .compare-row .highlight {
            color: var(--accent);
            font-weight: 700;
            font-family: 'Roboto Mono', monospace;
        }

        /* ========== 表单 ========== */
        .section-form {
            background: var(--deep);
            padding: 88px 0;
        }

        .form-wrap {
            max-width: 720px;
            margin: 0 auto;
            background: var(--white);
            border-radius: 16px;
            padding: 48px;
            box-shadow: 0 24px 80px rgba(0, 0, 0, .25);
        }

        .form-wrap h2 {
            font-size: 28px;
            margin-bottom: 8px;
            text-align: center;
        }

        .form-wrap .form-sub {
            text-align: center;
            color: var(--muted);
            font-size: 14px;
            margin-bottom: 32px;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--ink-dark);
        }

        .form-group label .required {
            color: var(--accent);
            margin-left: 2px;
        }

        .form-group input,
        .form-group textarea {
            width: 100%;
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 12px 16px;
            font-size: 15px;
            font-family: inherit;
            color: var(--ink);
            transition: border-color var(--transition), box-shadow var(--transition);
        }

        .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }

        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(15, 138, 125, .18);
        }

        .form-error {
            display: none;
            color: #d9534f;
            font-size: 13px;
            margin-top: 4px;
        }

        .form-error.show {
            display: block;
        }

        .form-group.has-error input,
        .form-group.has-error textarea {
            border-color: #d9534f;
        }

        .form-privacy {
            text-align: center;
            font-size: 12px;
            color: #B8C4C2;
            margin-top: 16px;
            line-height: 1.5;
        }

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

        .faq-layout {
            display: flex;
            gap: 60px;
        }

        .faq-left {
            flex: 0 0 320px;
        }

        .faq-left h2 {
            font-size: 30px;
            margin-bottom: 16px;
            letter-spacing: -0.4px;
        }

        .faq-left p {
            color: var(--muted);
            line-height: 1.8;
        }

        .faq-right {
            flex: 1;
        }

        .accordion-item {
            background: var(--white);
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-card);
            margin-bottom: 12px;
            overflow: hidden;
            border: 1px solid transparent;
            transition: border-color var(--transition);
        }

        .accordion-item:last-child {
            margin-bottom: 0;
        }

        .accordion-item.is-active {
            border-color: var(--border);
        }

        .accordion-title {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 700;
            color: var(--ink-dark);
            cursor: pointer;
            user-select: none;
            transition: background var(--transition);
        }

        .accordion-title:hover {
            background: rgba(15, 138, 125, .03);
        }

        .accordion-title .accordion-icon {
            font-size: 18px;
            color: var(--accent);
            transition: transform var(--transition);
            flex-shrink: 0;
            margin-left: 12px;
        }

        .accordion-item.is-active .accordion-icon {
            transform: rotate(45deg);
        }

        .accordion-content {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height .3s ease, padding .3s ease;
            line-height: 1.8;
        }

        .accordion-item.is-active .accordion-content {
            padding: 0 24px 20px;
            max-height: 400px;
            border-top: 1px solid var(--border);
            padding-top: 16px;
            margin-top: 0;
            transition: max-height .35s ease, padding .35s ease;
        }

        .accordion-content p {
            font-size: 15px;
            color: var(--muted);
        }

        /* ========== CTA 追加区块 ========== */
        .section-cta {
            background: linear-gradient(120deg, var(--primary-dark), var(--primary));
            padding: 64px 0;
            text-align: center;
        }

        .section-cta h2 {
            color: var(--white);
            font-size: 32px;
            margin-bottom: 12px;
        }

        .section-cta p {
            color: rgba(255, 255, 255, .85);
            margin-bottom: 28px;
            font-size: 16px;
        }

        .section-cta .btn {
            background: var(--accent);
            color: var(--white);
            border-color: var(--accent);
        }

        .section-cta .btn:hover {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--deep);
            padding: 64px 0 32px;
            color: #9AA8A5;
        }

        .footer-grid {
            display: flex;
            flex-wrap: wrap;
            margin: 0 -12px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, .08);
        }

        .footer-col {
            padding: 0 12px;
            flex: 0 0 25%;
            max-width: 25%;
        }

        .footer-brand {
            font-size: 18px;
            font-weight: 900;
            color: var(--white);
            margin-bottom: 12px;
            line-height: 1.4;
            display: block;
        }

        .footer-desc {
            font-size: 13px;
            line-height: 1.8;
            color: #9AA8A5;
        }

        .footer-title {
            font-size: 15px;
            font-weight: 700;
            color: var(--white);
            margin-bottom: 16px;
            display: block;
        }

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

        .footer-links a {
            color: #9AA8A5;
            font-size: 13px;
            text-decoration: none;
            transition: color var(--transition), padding-left var(--transition);
            display: inline-block;
        }

        .footer-links a:hover {
            color: var(--white);
            padding-left: 4px;
        }

        .footer-contact li {
            font-size: 13px;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-contact .contact-icon {
            color: var(--primary);
            flex-shrink: 0;
        }

        .copyright {
            padding-top: 24px;
            text-align: center;
            font-size: 12px;
            color: rgba(255, 255, 255, .4);
        }

        /* ========== 返回顶部 ========== */
        .back-to-top {
            display: none;
            position: fixed;
            right: 24px;
            bottom: 24px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--white);
            font-size: 18px;
            border: none;
            cursor: pointer;
            z-index: 999;
            box-shadow: 0 4px 16px rgba(15, 138, 125, .3);
            transition: background var(--transition), transform var(--transition);
            align-items: center;
            justify-content: center;
        }

        .back-to-top.show {
            display: flex;
        }

        .back-to-top:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
        }

        .back-to-top:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* ========== 响应式 ========== */
        @media (max-width: 64em) {
            :root {
                --section-padding: 64px;
            }

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

            .metrics-panel {
                padding: 24px;
            }

            .service-col-main {
                flex: 0 0 100%;
                max-width: 100%;
            }

            .service-col-normal {
                flex: 0 0 50%;
                max-width: 50%;
            }

            .footer-col {
                flex: 0 0 50%;
                max-width: 50%;
                margin-bottom: 32px;
            }
        }

        @media (max-width: 40em) {
            :root {
                --section-padding: 56px;
            }

            .container {
                padding: 0 16px;
            }

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

            .nav-panel {
                gap: 12px;
            }

            .brand {
                font-size: 17px;
            }

            .brand-icon {
                width: 32px;
                height: 32px;
                font-size: 15px;
            }

            .nav-links {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                gap: 8px;
                padding-top: 12px;
            }

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

            .nav-card {
                text-align: center;
            }

            .nav-toggle {
                display: flex;
            }

            .nav-cta {
                margin-left: auto;
            }

            .hero {
                min-height: auto;
                padding: 60px 0;
            }

            .hero-inner {
                flex-direction: column;
                gap: 32px;
            }

            .hero-left h1 {
                font-size: 27px;
            }

            .hero-sub {
                font-size: 15px;
            }

            .hero-actions .btn {
                width: 100%;
            }

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

            .metric-value {
                font-size: 22px;
            }

            .service-col-main,
            .service-col-normal {
                flex: 0 0 100%;
                max-width: 100%;
            }

            .compare-wrap {
                flex-direction: column;
                gap: 40px;
            }

            .compare-left h2 {
                font-size: 24px;
            }

            .form-wrap {
                padding: 32px 24px;
            }

            .faq-layout {
                flex-direction: column;
                gap: 32px;
            }

            .faq-left {
                flex: 0 0 auto;
            }

            .faq-left h2 {
                font-size: 24px;
            }

            .footer-col {
                flex: 0 0 100%;
                max-width: 100%;
            }

            .section-cta h2 {
                font-size: 26px;
            }
        }

        @media (max-width: 520px) {
            .metrics-panel {
                padding: 20px;
            }

            .compare-row {
                grid-template-columns: 1fr 0.8fr 1.1fr;
                font-size: 13px;
                padding: 12px 6px;
            }

            .post-grid {
                margin: 0;
            }

            .post-col {
                padding: 0;
                margin-bottom: 20px;
            }

            .btn {
                padding: 12px 20px;
                font-size: 14px;
            }
        }

        /* ========== 工具类 ========== */
        .text-center {
            text-align: center;
        }

        .mt-2 {
            margin-top: 16px;
        }

        .mb-2 {
            margin-bottom: 16px;
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0F8A7D;
            --primary-dark: #0B6B60;
            --accent: #F26B38;
            --accent-hover: #D9551F;
            --bg: #F7F5F2;
            --ink: #1F2A28;
            --ink-dark: #0E1514;
            --deep: #14201F;
            --border: #E4E0DA;
            --muted: #6B7573;
            --white: #FFFFFF;
            --radius: 14px;
            --shadow: 0 2px 8px rgba(20, 32, 31, 0.06), 0 12px 32px rgba(20, 32, 31, 0.08);
            --shadow-hover: 0 16px 40px rgba(20, 32, 31, 0.14);
            --transition: all 0.2s ease;
        }

        /* ===== 基础 Reset ===== */
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.9;
            color: var(--ink);
            background-color: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

        ul, ol {
            list-style: none;
        }

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

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

        /* ===== 导航 ===== */
        .site-header {
            background: var(--deep);
            padding: 16px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 24px rgba(20, 32, 31, 0.3);
        }

        .nav-panel {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 10px;
            font-size: 18px;
            color: var(--accent);
        }

        .brand span:last-child {
            color: var(--white);
            font-size: 17px;
            font-weight: 700;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-left: auto;
        }

        .nav-card {
            display: inline-block;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.85);
            font-size: 14px;
            font-weight: 500;
            padding: 9px 18px;
            border-radius: 8px;
            border-bottom: 3px solid transparent;
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-card:hover {
            background: rgba(15, 138, 125, 0.25);
            color: #fff;
        }

        .nav-card.active {
            background: rgba(15, 138, 125, 0.18);
            color: #fff;
            border-bottom-color: var(--accent);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 700;
            border-radius: 10px;
            padding: 14px 28px;
            font-size: 15px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            line-height: 1.2;
        }

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

        .btn-accent:hover {
            background: var(--accent-hover);
            transform: translateY(2px);
            box-shadow: 0 8px 20px rgba(242, 107, 56, 0.3);
        }

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

        .nav-cta {
            flex-shrink: 0;
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 24px;
            cursor: pointer;
            padding: 4px;
            line-height: 1;
        }

        /* ===== 页面 Hero ===== */
        .page-hero {
            position: relative;
            background: linear-gradient(135deg, rgba(20, 32, 31, 0.92), rgba(20, 32, 31, 0.75)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            padding: 80px 0;
            color: #fff;
            margin-bottom: 72px;
        }

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

        .page-hero h1 {
            font-size: 38px;
            font-weight: 900;
            letter-spacing: -0.5px;
            line-height: 1.3;
            margin-bottom: 16px;
        }

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

        .page-hero .hero-desc {
            font-size: 16px;
            line-height: 1.9;
            color: rgba(255, 255, 255, 0.85);
            max-width: 620px;
            margin-bottom: 28px;
        }

        .hero-tags {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 12px;
        }

        .hero-tags span {
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: rgba(255, 255, 255, 0.9);
            padding: 5px 14px;
            border-radius: 999px;
            font-size: 13px;
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 72px 0;
        }

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

        .section-head {
            margin-bottom: 48px;
        }

        .section-head .sec-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            background: rgba(15, 138, 125, 0.12);
            border-radius: 12px;
            color: var(--primary);
            font-size: 20px;
            margin-bottom: 14px;
        }

        .section-head h2 {
            font-size: 30px;
            font-weight: 800;
            color: var(--ink);
            letter-spacing: -0.3px;
            position: relative;
            padding-left: 18px;
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .section-head h2::before {
            content: '';
            position: absolute;
            left: 0;
            top: 4px;
            bottom: 4px;
            width: 5px;
            background: var(--accent);
            border-radius: 3px;
        }

        .section-head .sec-sub {
            color: var(--muted);
            font-size: 15px;
            padding-left: 18px;
        }

        /* ===== 双列图文 ===== */
        .split-block {
            display: flex;
            gap: 56px;
            align-items: center;
        }

        .split-media {
            flex: 0 0 48%;
        }

        .split-media img {
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
        }

        .split-content {
            flex: 1;
        }

        .split-content .sec-label {
            display: inline-block;
            background: rgba(15, 138, 125, 0.1);
            color: var(--primary);
            font-size: 13px;
            font-weight: 700;
            padding: 4px 14px;
            border-radius: 999px;
            margin-bottom: 16px;
        }

        .split-content h3 {
            font-size: 26px;
            font-weight: 800;
            line-height: 1.4;
            margin-bottom: 16px;
            color: var(--ink);
        }

        .split-content p {
            font-size: 15px;
            color: var(--muted);
            line-height: 1.9;
            margin-bottom: 20px;
        }

        .split-points {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-bottom: 24px;
        }

        .split-points li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 14px;
            color: var(--ink);
            line-height: 1.6;
        }

        .split-points li i {
            color: var(--primary);
            margin-top: 3px;
            font-size: 14px;
        }

        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
            padding: 12px 26px;
        }

        .btn-outline:hover {
            background: rgba(15, 138, 125, 0.1);
            transform: translateY(2px);
        }

        /* ===== 特性卡片 ===== */
        .feature-grid {
            display: flex;
            gap: 24px;
            margin-top: 48px;
        }

        .feature-card {
            flex: 1;
            background: var(--white);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 32px 28px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .feature-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), transparent);
            opacity: 0;
            transition: var(--transition);
        }

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

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

        .feature-icon {
            width: 52px;
            height: 52px;
            background: rgba(15, 138, 125, 0.12);
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--primary);
            margin-bottom: 18px;
        }

        .feature-card h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--ink);
        }

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

        /* ===== 数据指标带 ===== */
        .stats-band {
            background: var(--deep);
            border-radius: var(--radius);
            padding: 36px 32px;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            margin-top: 64px;
        }

        .stat-item {
            text-align: center;
            padding: 16px 8px;
            border-radius: 10px;
        }

        .stat-value {
            font-family: 'Roboto Mono', monospace;
            font-size: 30px;
            font-weight: 700;
            color: var(--white);
            line-height: 1.3;
        }

        .stat-value .trend {
            font-size: 16px;
            color: var(--accent);
            margin-left: 4px;
        }

        .stat-label {
            font-size: 13px;
            color: #B8C4C2;
            margin-top: 6px;
        }

        /* ===== 数据报告列表 ===== */
        .data-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .data-item {
            background: var(--white);
            border-radius: 12px;
            box-shadow: 0 2px 8px rgba(20, 32, 31, 0.05);
            padding: 20px 24px;
            display: flex;
            align-items: center;
            gap: 24px;
            transition: var(--transition);
            border-left: 4px solid transparent;
        }

        .data-item:hover {
            box-shadow: var(--shadow);
            border-left-color: var(--primary);
            transform: translateX(4px);
        }

        .data-item .item-tag {
            background: rgba(15, 138, 125, 0.1);
            color: var(--primary);
            font-size: 13px;
            font-weight: 700;
            padding: 3px 12px;
            border-radius: 999px;
            flex-shrink: 0;
        }

        .data-item .item-title {
            flex: 1;
            font-size: 16px;
            font-weight: 600;
            color: var(--ink);
            transition: var(--transition);
        }

        .data-item:hover .item-title {
            color: var(--primary);
        }

        .data-item .item-date {
            font-size: 13px;
            color: var(--muted);
            font-family: 'Roboto Mono', monospace;
            flex-shrink: 0;
        }

        .data-item .item-arrow {
            color: var(--primary);
            font-size: 14px;
            flex-shrink: 0;
            transition: var(--transition);
        }

        .data-item:hover .item-arrow {
            transform: translateX(4px);
        }

        /* ===== FAQ ===== */
        .faq-wrap {
            display: flex;
            gap: 56px;
        }

        .faq-intro {
            flex: 0 0 35%;
        }

        .faq-intro h2 {
            font-size: 26px;
            font-weight: 800;
            margin-bottom: 14px;
            line-height: 1.4;
        }

        .faq-intro p {
            color: var(--muted);
            font-size: 15px;
            line-height: 1.8;
        }

        .faq-list {
            flex: 1;
        }

        .faq-item {
            background: var(--white);
            border-radius: 10px;
            padding: 20px 24px;
            margin-bottom: 12px;
            box-shadow: 0 2px 8px rgba(20, 32, 31, 0.05);
            transition: var(--transition);
        }

        .faq-item:hover {
            box-shadow: var(--shadow);
        }

        .faq-q {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            gap: 16px;
        }

        .faq-q h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--ink);
            line-height: 1.5;
        }

        .faq-q .faq-icon {
            font-size: 18px;
            color: var(--primary);
            flex-shrink: 0;
            width: 32px;
            height: 32px;
            background: rgba(15, 138, 125, 0.1);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.3s ease;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        .faq-a {
            display: none;
            margin-top: 14px;
            padding-top: 14px;
            border-top: 1px solid var(--border);
            font-size: 14px;
            color: var(--muted);
            line-height: 1.8;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--deep), #1D2A28);
            padding: 48px 0;
            margin-top: 72px;
        }

        .cta-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
            color: #fff;
        }

        .cta-text h3 {
            font-size: 28px;
            font-weight: 800;
            margin-bottom: 10px;
        }

        .cta-text p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.8);
            line-height: 1.7;
        }

        .cta-btn-wrap {
            flex-shrink: 0;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--deep);
            padding: 64px 0 32px;
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            margin-bottom: 40px;
        }

        .footer-brand {
            display: block;
            color: #fff;
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .footer-desc {
            color: #9AA8A5;
            font-size: 13px;
            line-height: 1.8;
        }

        .footer-title {
            display: block;
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer-links li, .footer-contact li {
            margin-bottom: 8px;
            color: #9AA8A5;
            font-size: 13px;
        }

        .footer-links a {
            color: #9AA8A5;
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: #fff;
            padding-left: 2px;
        }

        .footer-contact .contact-icon {
            margin-right: 6px;
        }

        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            text-align: center;
            color: #7D8A87;
            font-size: 12px;
            line-height: 1.6;
        }

        /* ===== 返回顶部 ===== */
        .to-top {
            position: fixed;
            right: 20px;
            bottom: 30px;
            width: 44px;
            height: 44px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: 50%;
            font-size: 18px;
            cursor: pointer;
            box-shadow: 0 4px 16px rgba(15, 138, 125, 0.35);
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: var(--transition);
            z-index: 99;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .to-top.show {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .to-top:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
        }

        /* ===== 焦点状态 ===== */
        a:focus-visible, button:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 64em) {
            .nav-panel {
                flex-wrap: wrap;
            }

            .nav-links {
                order: 4;
                width: 100%;
                margin: 8px 0 0;
                overflow-x: auto;
                padding-bottom: 4px;
            }

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

            .split-block {
                flex-direction: column;
                gap: 32px;
            }

            .split-media {
                flex: 0 0 100%;
                width: 100%;
            }

            .faq-wrap {
                flex-direction: column;
                gap: 36px;
            }

            .faq-intro {
                flex: 0 0 100%;
            }
        }

        @media (max-width: 40em) {
            .nav-toggle {
                display: block;
                margin-left: auto;
            }

            .nav-links {
                display: none;
                flex-direction: column;
                align-items: stretch;
                overflow: visible;
            }

            .nav-links.show {
                display: flex;
            }

            .nav-card {
                text-align: center;
            }

            .nav-cta {
                margin-left: auto;
            }

            .page-hero {
                padding: 56px 0;
            }

            .page-hero h1 {
                font-size: 30px;
            }

            .section {
                padding: 56px 0;
            }

            .feature-grid {
                flex-direction: column;
            }

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

            .data-item {
                flex-wrap: wrap;
                gap: 8px 16px;
            }

            .item-date {
                margin-left: auto;
            }

            .cta-content {
                flex-direction: column;
                text-align: center;
            }

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

            .section-head h2 {
                font-size: 26px;
            }

            h1 { font-size: 32px; }
            h2 { font-size: 24px; }
        }

        @media (max-width: 520px) {
            .brand span:last-child {
                font-size: 14px;
            }

            .nav-links .nav-card {
                font-size: 13px;
                padding: 8px 14px;
            }

            .stats-band {
                grid-template-columns: 1fr;
                padding: 24px;
            }

            .stat-item {
                text-align: left;
                display: flex;
                align-items: baseline;
                gap: 12px;
                padding: 8px 4px;
            }

            .stat-value {
                font-size: 26px;
            }
        }

/* roulang page: article */
:root {
  --primary: #0F8A7D;
  --primary-dark: #0B6B60;
  --primary-light: rgba(15, 138, 125, .12);
  --accent: #F26B38;
  --accent-hover: #D9551F;
  --bg: #F7F5F2;
  --ink: #1F2A28;
  --ink-dark: #0E1514;
  --deep: #14201F;
  --border: #E4E0DA;
  --muted: #6B7573;
  --white: #FFFFFF;
  --radius: 14px;
  --shadow: 0 2px 8px rgba(20, 32, 31, .06), 0 12px 32px rgba(20, 32, 31, .08);
  --shadow-hover: 0 16px 40px rgba(20, 32, 31, .14);
  --font-main: 'Noto Sans SC', sans-serif;
  --font-mono: 'Roboto Mono', monospace;
  --space-section: 88px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-main);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; border-radius: 12px; display: block; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; }
a:focus-visible, button:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; width: 100%; }

/* ===== Header ===== */
.site-header {
  background: var(--deep);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 20px rgba(20, 32, 31, .22);
}
.nav-panel { display: flex; align-items: center; gap: 24px; }
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -.5px;
  white-space: nowrap;
  line-height: 1.3;
}
.brand:hover { color: #fff; }
.brand-icon {
  width: 36px;
  height: 36px;
  background: var(--accent);
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: #fff;
  flex: 0 0 36px;
}
.nav-links { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.nav-card {
  background: rgba(255, 255, 255, .1);
  color: #D6DEDC;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  position: relative;
  transition: background .2s ease, color .2s ease;
  border-bottom: 3px solid transparent;
  line-height: 1.4;
}
.nav-card:hover { background: rgba(15, 138, 125, .25); color: #fff; }
.nav-card.active { background: rgba(15, 138, 125, .25); color: #fff; border-bottom-color: var(--accent); }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  border-radius: 10px;
  padding: 14px 28px;
  font-size: 15px;
  text-decoration: none;
  transition: all .2s ease;
  line-height: 1.2;
  border: none;
}
.btn-accent { background: var(--accent); color: #fff; box-shadow: 0 4px 14px rgba(242, 107, 56, .3); }
.btn-accent:hover { background: var(--accent-hover); color: #fff; transform: translateY(2px); box-shadow: 0 2px 8px rgba(242, 107, 56, .35); }
.btn-sm { padding: 10px 18px; font-size: 14px; }
.nav-cta { margin-left: 4px; white-space: nowrap; }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 22px;
  padding: 6px 10px;
  line-height: 1;
}

/* ===== Article Page ===== */
.article-page {
  padding: 48px 0 var(--space-section);
  flex: 1;
}
.breadcrumb {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.breadcrumb a { color: var(--primary); }
.breadcrumb .sep { color: #B8C4C2; }
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 32px;
  align-items: flex-start;
}
.article-main { min-width: 0; }
.article-wrap {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px;
}
.article-header { margin-bottom: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.article-title {
  font-size: 36px;
  font-weight: 900;
  line-height: 1.25;
  color: var(--ink-dark);
  letter-spacing: -.5px;
  margin: 0 0 16px;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  font-size: 13px;
  color: var(--muted);
}
.meta-badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 12px;
  font-weight: 700;
  border-radius: 999px;
  padding: 4px 12px;
}
.meta-item { display: inline-flex; align-items: center; gap: 4px; }
.meta-icon { font-size: 14px; }

.article-body {
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
  word-break: break-word;
}
.article-body > * + * { margin-top: 24px; }
.article-body h2 {
  font-size: 26px;
  font-weight: 800;
  color: var(--ink-dark);
  line-height: 1.4;
  padding-left: 14px;
  border-left: 4px solid var(--accent);
  margin: 40px 0 20px;
}
.article-body h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-dark);
  line-height: 1.5;
  margin: 32px 0 16px;
}
.article-body h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-dark);
  margin: 28px 0 12px;
}
.article-body p { margin: 28px 0; line-height: 1.9; }
.article-body blockquote {
  margin: 28px 0;
  padding: 20px 24px;
  border-left: 4px solid var(--primary);
  background: #F0F5F4;
  border-radius: 0 12px 12px 0;
  color: var(--ink);
}
.article-body img {
  border-radius: 12px;
  margin: 28px 0;
  width: auto;
  max-width: 100%;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  background: #fff;
}
.article-body th,
.article-body td {
  padding: 12px 16px;
  border: 1px solid var(--border);
  text-align: left;
  font-size: 14px;
  line-height: 1.7;
}
.article-body th { background: #F7F5F2; font-weight: 700; }
.article-body ul,
.article-body ol { margin: 28px 0; padding-left: 24px; }
.article-body li { margin-bottom: 14px; line-height: 1.9; }
.article-body code {
  background: #F0F5F4;
  color: var(--primary-dark);
  padding: 2px 8px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 14px;
}
.article-body pre {
  background: var(--deep);
  color: #E8F0EE;
  padding: 24px;
  border-radius: 14px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
}
.article-body pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: 14px;
}
.article-body a { color: var(--primary); text-decoration: underline; }
.article-body a:hover { color: var(--primary-dark); }

.article-notfound {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 60px 40px;
  text-align: center;
}
.article-notfound h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--ink-dark);
  margin-bottom: 12px;
}
.article-notfound p { color: var(--muted); margin-bottom: 24px; }

.article-nav {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.article-nav-btn.button.hollow {
  border: 1px solid var(--primary);
  color: var(--primary);
  background: transparent;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: all .2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0;
}
.article-nav-btn.button.hollow:hover {
  background: var(--primary-light);
  border-color: var(--primary-dark);
  color: var(--primary-dark);
  transform: translateY(-2px);
}

/* ===== Sidebar ===== */
.sidebar { display: flex; flex-direction: column; gap: 24px; min-width: 0; }
.sidebar-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}
.sidebar-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--ink-dark);
  margin: 0 0 18px;
  padding-left: 12px;
  border-left: 3px solid var(--accent);
  line-height: 1.4;
}
.sidebar-cat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.sidebar-cat-list a {
  display: block;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--ink);
  font-size: 14px;
  transition: all .2s ease;
  background: #F7F5F2;
  line-height: 1.5;
}
.sidebar-cat-list a:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding-left: 18px;
}
.sidebar-rec-item {
  display: flex;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid #F1EFEB;
  text-decoration: none;
  align-items: center;
}
.sidebar-rec-item:last-child { border-bottom: none; }
.sidebar-rec-thumb {
  width: 72px;
  height: 54px;
  flex: 0 0 72px;
  border-radius: 8px;
  object-fit: cover;
  background: #E4E0DA;
}
.sidebar-rec-info { flex: 1; min-width: 0; }
.sidebar-rec-info span {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.5;
  transition: color .2s;
}
.sidebar-rec-item:hover .sidebar-rec-info span { color: var(--primary); }
.sidebar-ad {
  background: var(--deep);
  color: #fff;
  border-radius: 10px;
  padding: 20px;
  text-align: center;
  font-size: 13px;
  line-height: 1.7;
}
.sidebar-ad strong {
  display: block;
  font-size: 16px;
  margin-bottom: 6px;
  color: #fff;
}

/* ===== Related ===== */
.related-section { margin-top: 56px; }
.related-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
}
.related-head::before {
  content: '';
  width: 4px;
  height: 18px;
  background: var(--accent);
  border-radius: 2px;
}
.related-head h2 {
  font-size: 26px;
  font-weight: 800;
  color: var(--ink-dark);
  margin: 0;
  line-height: 1.4;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.related-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
  text-decoration: none;
  display: block;
}
.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.related-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #E4E0DA;
  border-radius: 0;
}
.related-body { padding: 24px; }
.related-badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 12px;
  font-weight: 700;
  border-radius: 999px;
  padding: 3px 10px;
  margin-bottom: 12px;
}
.related-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-dark);
  line-height: 1.5;
  margin: 0 0 8px;
}
.related-excerpt {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin: 0 0 12px;
}
.related-date { font-size: 12px; color: var(--muted); }

/* ===== Footer ===== */
.site-footer {
  background: var(--deep);
  color: #9AA8A5;
  padding: 64px 0 32px;
  margin-top: auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand {
  font-size: 18px;
  font-weight: 900;
  color: #fff;
  display: block;
  margin-bottom: 12px;
  line-height: 1.4;
}
.footer-desc {
  font-size: 13px;
  line-height: 1.8;
  color: #9AA8A5;
  margin: 0;
}
.footer-title {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  display: block;
  margin-bottom: 16px;
}
.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links a {
  color: #9AA8A5;
  font-size: 13px;
  text-decoration: none;
  transition: all .2s ease;
  line-height: 1.5;
}
.footer-links a:hover { color: #fff; margin-left: 2px; }
.footer-contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 13px;
  line-height: 1.5;
}
.contact-icon { margin-right: 6px; }
.copyright {
  border-top: 1px solid rgba(255, 255, 255, .08);
  padding-top: 24px;
  text-align: center;
  font-size: 12px;
  color: #7A8A87;
}

/* ===== Responsive ===== */
@media (max-width: 64em) {
  .article-layout { grid-template-columns: 1fr; }
  .sidebar {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 8px;
  }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 40em) {
  :root { --space-section: 56px; }
  .container { padding: 0 16px; }
  .site-header { padding: 14px 0; }
  .nav-panel { flex-wrap: wrap; gap: 12px; }
  .brand { font-size: 17px; }
  .brand-icon { width: 32px; height: 32px; font-size: 16px; flex-basis: 32px; }
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 8px;
    margin: 4px 0 0;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; margin-left: auto; }
  .nav-cta { display: none; }
  .article-page { padding-top: 24px; }
  .article-wrap { padding: 24px; border-radius: 12px; }
  .article-title { font-size: 28px; }
  .article-meta { gap: 12px; }
  .article-nav { flex-direction: column; align-items: stretch; }
  .article-nav-btn.button.hollow { justify-content: center; }
  .sidebar { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .site-footer { padding: 48px 0 24px; }
}

/* roulang page: category2 */
:root {
  --primary: #0F8A7D;
  --primary-dark: #0B6B60;
  --accent: #F26B38;
  --accent-hover: #D9551F;
  --bg: #F7F5F2;
  --white: #FFFFFF;
  --ink: #1F2A28;
  --ink-dark: #0E1514;
  --deep: #14201F;
  --deep-light: #1D2A28;
  --border: #E4E0DA;
  --muted: #6B7573;
  --light-muted: #B8C4C2;
  --radius: 14px;
  --shadow: 0 2px 8px rgba(20,32,31,.06), 0 12px 32px rgba(20,32,31,.08);
  --shadow-lg: 0 16px 40px rgba(20,32,31,.14);
  --font: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --mono: 'Roboto Mono', 'SF Mono', monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  margin: 0;
  padding: 0;
}

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

.section {
  padding: 88px 0;
}

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

.section-head .section-tag {
  display: inline-block;
  padding: 5px 14px;
  background: rgba(15,138,125,.1);
  color: var(--primary);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
}

.section-head h2 {
  font-size: 30px;
  font-weight: 900;
  letter-spacing: -.5px;
  margin: 0 0 10px;
  position: relative;
  padding-left: 18px;
}

.section-head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 4px;
  height: 24px;
  border-radius: 4px;
  background: var(--accent);
}

.section-head p {
  color: var(--muted);
  font-size: 15px;
  margin: 0;
}

.section-head.center {
  text-align: center;
}

.section-head.center h2 {
  padding-left: 0;
}

.section-head.center h2::before {
  display: none;
}

/* ===== 顶部导航 ===== */
.site-header {
  background: var(--deep);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 10px 30px rgba(20,32,31,.18);
}

.nav-panel {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -.3px;
  text-decoration: none;
  white-space: nowrap;
  line-height: 1.4;
  transition: opacity .2s ease;
}

.brand:hover {
  color: #fff;
  opacity: .88;
}

.brand-icon {
  flex: 0 0 36px;
  width: 36px;
  height: 36px;
  background: var(--accent);
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 4px 12px rgba(242,107,56,.35);
}

.nav-links {
  display: flex;
  gap: 10px;
  margin-left: auto;
  flex-wrap: wrap;
}

.nav-card {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,.82);
  background: rgba(255,255,255,.06);
  text-decoration: none;
  transition: background .2s ease, color .2s ease;
  border-bottom: 3px solid transparent;
}

.nav-card:hover {
  background: rgba(15,138,125,.25);
  color: #fff;
}

.nav-card.active {
  background: rgba(242,107,56,.15);
  color: #fff;
  border-bottom-color: var(--accent);
}

.nav-cta {
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  color: #fff;
  font-size: 26px;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
  border-radius: 8px;
}

.nav-toggle:hover {
  background: rgba(255,255,255,.1);
}

/* ===== 页面首屏 ===== */
.page-hero {
  background: linear-gradient(120deg, rgba(20,32,31,.94) 0%, rgba(20,32,31,.78) 55%, rgba(20,32,31,.42) 100%),
              url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  padding: 90px 0 76px;
  color: #fff;
  position: relative;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  margin-bottom: 26px;
  color: rgba(255,255,255,.65);
}

.breadcrumb a {
  color: rgba(255,255,255,.8);
  text-decoration: none;
  transition: color .2s ease;
}

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

.breadcrumb-sep {
  color: rgba(255,255,255,.4);
}

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

.hero-title {
  font-size: 38px;
  font-weight: 900;
  letter-spacing: -.5px;
  line-height: 1.3;
  margin: 0 0 18px;
  color: #fff;
  max-width: 720px;
}

.hero-title .accent-text {
  color: var(--accent);
}

.hero-desc {
  font-size: 16px;
  color: rgba(255,255,255,.88);
  max-width: 680px;
  margin: 0 0 30px;
  line-height: 1.8;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.meta-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 999px;
  font-size: 13px;
  color: rgba(255,255,255,.9);
  backdrop-filter: blur(6px);
}

/* ===== Tabs 功能区 ===== */
.function-tabs {
  background: var(--bg);
}

.platform-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  border: 0;
  background: transparent;
  margin: 0 0 28px;
  list-style: none;
}

.platform-tabs .tabs-title {
  flex: 0 0 auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--white);
  transition: box-shadow .2s ease, transform .2s ease;
}

.platform-tabs .tabs-title:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.platform-tabs .tabs-title > a {
  display: block;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  background: transparent;
  transition: background .2s ease, color .2s ease;
}

.platform-tabs .tabs-title.is-active {
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 8px 24px rgba(15,138,125,.28);
}

.platform-tabs .tabs-title.is-active > a {
  color: #fff;
}

.platform-tabs .tabs-title:not(.is-active) > a:hover {
  color: var(--primary);
}

.tabs-content {
  border: 0;
  background: transparent;
}

.tabs-panel {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px;
}

.tab-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
  align-items: center;
}

.tab-media {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--bg);
}

.tab-media::after {
  content: "◆";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(20,32,31,0);
  color: transparent;
  transition: background .2s ease;
  pointer-events: none;
}

.tab-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: 12px;
}

.tab-content-block {
  padding: 8px 0;
}

.tab-content-block h3 {
  font-size: 24px;
  font-weight: 900;
  margin: 0 0 14px;
  color: var(--ink);
}

.tab-content-block > p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.9;
  margin: 0 0 24px;
}

.function-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.function-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: var(--bg);
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  transition: background .2s ease, transform .2s ease;
}

.function-list li:hover {
  background: rgba(15,138,125,.1);
  transform: translateX(4px);
}

.list-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 3px;
}

/* ===== 引用块 ===== */
.citation-section {
  padding: 72px 0;
  background: var(--white);
}

.citation-block {
  background: var(--deep);
  border-left: 4px solid var(--accent);
  border-radius: 16px;
  padding: 40px 48px;
  margin: 0;
  color: #E7EDEB;
  font-size: 18px;
  line-height: 1.9;
  position: relative;
  box-shadow: var(--shadow);
}

.citation-block p {
  margin: 0 0 14px;
  font-weight: 500;
}

.citation-block cite {
  color: var(--light-muted);
  font-size: 14px;
  font-style: normal;
  display: block;
}

.citation-quote-mark {
  position: absolute;
  top: -14px;
  right: 28px;
  width: 44px;
  height: 44px;
  background: var(--accent);
  border-radius: 50%;
  color: #fff;
  font-size: 24px;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 18px rgba(242,107,56,.35);
}

/* ===== 功能优势 ===== */
.advantage-section {
  background: var(--bg);
}

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin: 0;
}

.adv-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 24px;
  transition: transform .2s ease, box-shadow .2s ease;
  border-top: 3px solid var(--primary);
}

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

.adv-num {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 14px;
  display: inline-block;
  background: rgba(242,107,56,.1);
  border-radius: 6px;
  padding: 4px 10px;
}

.adv-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 10px;
}

.adv-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.8;
  margin: 0;
}

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

.faq-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.6fr;
  gap: 48px;
  align-items: start;
}

.faq-intro h2 {
  font-size: 30px;
  font-weight: 900;
  letter-spacing: -.5px;
  margin: 0 0 14px;
  position: relative;
  padding-left: 18px;
}

.faq-intro h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 4px;
  height: 24px;
  border-radius: 4px;
  background: var(--accent);
}

.faq-intro p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.8;
  margin: 0;
}

.faq-accordion {
  list-style: none;
  background: transparent;
  margin: 0;
  border: 0;
}

.faq-accordion .accordion-item {
  background: var(--white);
  border-radius: 12px;
  box-shadow: var(--shadow);
  margin-bottom: 14px;
  border: 1px solid var(--border);
  overflow: hidden;
  transition: box-shadow .2s ease;
}

.faq-accordion .accordion-item.is-active {
  box-shadow: var(--shadow-lg);
}

.faq-accordion .accordion-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  padding: 20px 24px;
  border: 0;
  background: var(--white);
  line-height: 1.5;
  text-decoration: none;
}

.faq-accordion .accordion-title::before,
.faq-accordion .accordion-title::after {
  content: none;
}

.faq-accordion .accordion-title .accordion-arrow {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--primary);
  transition: background .2s ease, transform .3s ease;
}

.faq-accordion .accordion-item.is-active .accordion-title .accordion-arrow {
  transform: rotate(45deg);
  background: var(--primary);
  color: #fff;
}

.faq-accordion .accordion-content {
  border-top: 1px solid var(--border);
  padding: 4px 24px 20px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.9;
  background: var(--white);
}

.faq-accordion .accordion-content p {
  margin: 14px 0 0;
}

/* ===== CTA ===== */
.cta-section {
  background: var(--deep);
  padding: 80px 0;
}

.cta-box {
  background: linear-gradient(135deg, rgba(15,138,125,.18), rgba(255,255,255,.03)), var(--deep-light);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 20px;
  padding: 56px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-box h2 {
  color: #fff;
  font-size: 30px;
  font-weight: 900;
  letter-spacing: -.5px;
  margin: 0 0 14px;
}

.cta-box p {
  color: var(--light-muted);
  font-size: 15px;
  max-width: 640px;
  margin: 0 auto 32px;
  line-height: 1.9;
}

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

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  padding: 14px 28px;
  transition: all .2s ease;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  line-height: 1.5;
}

.btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

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

.btn-accent:hover {
  background: var(--accent-hover);
  transform: translateY(2px);
  box-shadow: 0 8px 24px rgba(242,107,56,.32);
  color: #fff;
}

.btn-outline {
  border-color: rgba(255,255,255,.35);
  color: #fff;
  background: transparent;
}

.btn-outline:hover {
  background: rgba(255,255,255,.1);
  border-color: rgba(255,255,255,.6);
  color: #fff;
}

.btn-sm {
  padding: 10px 18px;
  font-size: 14px;
  border-radius: 8px;
}

.btn-lg {
  padding: 16px 34px;
  font-size: 16px;
  border-radius: 12px;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--deep);
  color: #9AA8A5;
  padding: 64px 0 28px;
  font-size: 13px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand {
  font-size: 18px;
  font-weight: 900;
  color: #fff;
  letter-spacing: -.3px;
  display: block;
  margin-bottom: 14px;
}

.footer-desc {
  color: #9AA8A5;
  font-size: 13px;
  line-height: 1.9;
  margin: 0;
}

.footer-title {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  display: block;
  margin-bottom: 16px;
}

.footer-links,
.footer-contact {
  list-style: none;
  margin: 0;
  padding: 0;
}

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

.footer-links a {
  color: #9AA8A5;
  text-decoration: none;
  transition: color .2s ease, padding-left .2s ease;
  display: inline-block;
}

.footer-links a:hover {
  color: #fff;
  padding-left: 6px;
}

.footer-contact li {
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: #9AA8A5;
}

.contact-icon {
  font-style: normal;
}

.copyright {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: 24px;
  text-align: center;
  font-size: 12px;
  color: rgba(255,255,255,.5);
}

.copyright a {
  color: rgba(255,255,255,.6);
  text-decoration: none;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  text-decoration: none;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all .3s ease;
  z-index: 99;
  border: 0;
  cursor: pointer;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

.back-to-top:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ===== 响应式 ===== */
@media (max-width: 64em) {
  .nav-links {
    display: none;
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    right: 0;
    background: var(--deep);
    padding: 16px;
    flex-direction: column;
    gap: 8px;
    box-shadow: 0 20px 40px rgba(20,32,31,.25);
    border-radius: 0 0 16px 16px;
    z-index: 99;
  }

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

  .nav-card {
    width: 100%;
    text-align: left;
  }

  .nav-toggle {
    display: block;
    margin-left: auto;
  }

  .nav-cta {
    display: none;
  }

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

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

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }

  .tab-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .tab-media img {
    height: 220px;
  }
}

@media (max-width: 40em) {
  .section {
    padding: 56px 0;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-desc {
    font-size: 15px;
  }

  .tabs-panel {
    padding: 24px 20px;
  }

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

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

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

  .citation-block {
    padding: 32px 24px;
  }

  .platform-tabs .tabs-title {
    flex: 1 1 100%;
  }

  .platform-tabs .tabs-title > a {
    padding: 12px 18px;
  }

  .back-to-top {
    right: 16px;
    bottom: 16px;
  }
}

/* roulang page: category3 */
:root {
            --primary: #0F8A7D;
            --primary-dark: #0B6B60;
            --accent: #F26B38;
            --accent-hover: #D9551F;
            --bg: #F7F5F2;
            --ink: #1F2A28;
            --ink-dark: #0E1514;
            --deep: #14201F;
            --border: #E4E0DA;
            --muted: #6B7573;
            --white: #fff;
            --radius: 14px;
            --radius-sm: 10px;
            --shadow-card: 0 2px 8px rgba(20,32,31,.06), 0 12px 32px rgba(20,32,31,.08);
            --shadow-hover: 0 6px 16px rgba(20,32,31,.08), 0 16px 40px rgba(20,32,31,.14);
            --transition: all .2s ease;
        }
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Noto Sans SC', sans-serif;
            background: var(--bg);
            color: var(--ink);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        ul { list-style: none; }
        h1, h2, h3 { font-family: 'Noto Sans SC', sans-serif; }

        .section { padding: 88px 0; }
        .section-alt { background: var(--white); }
        .section-head { text-align: center; margin-bottom: 48px; }
        .section-head h2 {
            font-size: 30px;
            font-weight: 800;
            color: var(--ink-dark);
            letter-spacing: -0.5px;
            position: relative;
            display: inline-block;
            margin-bottom: 12px;
        }
        .section-head h2::before {
            content: '';
            display: block;
            width: 44px;
            height: 4px;
            border-radius: 4px;
            background: var(--accent);
            margin: 0 auto 16px;
        }
        .section-head p {
            color: var(--muted);
            font-size: 15px;
            max-width: 560px;
            margin: 0 auto;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 700;
            line-height: 1;
            cursor: pointer;
            transition: var(--transition);
            border: 2px solid transparent;
            text-decoration: none;
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
            color: #fff;
            transform: translateY(2px);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover {
            background: rgba(15, 138, 125, .1);
            color: var(--primary-dark);
            transform: translateY(2px);
        }
        .btn-white {
            background: #fff;
            color: var(--deep);
        }
        .btn-white:hover {
            background: #f0f0f0;
            color: var(--deep);
            transform: translateY(2px);
        }
        .btn-sm { padding: 10px 20px; font-size: 14px; }
        .btn:focus-visible,
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--primary) !important;
            outline-offset: 2px;
        }

        /* Header / Navigation */
        .site-header {
            background: var(--deep);
            padding: 16px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 24px rgba(20,32,31,.35);
        }
        .nav-panel {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            font-size: 18px;
            font-weight: 900;
            letter-spacing: -0.3px;
            text-decoration: none;
            white-space: nowrap;
        }
        .brand:hover { color: #fff; }
        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: var(--primary);
            color: #fff;
            font-size: 17px;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }
        .nav-card {
            display: inline-block;
            padding: 9px 18px;
            border-radius: 8px;
            background: rgba(255,255,255,.08);
            color: #c5d1cf;
            font-size: 14px;
            font-weight: 500;
            text-decoration: none;
            border-bottom: 3px solid transparent;
            transition: var(--transition);
        }
        .nav-card:hover {
            background: rgba(15,138,125,.25);
            color: #fff;
            transform: translateY(-2px);
        }
        .nav-card.active {
            background: rgba(15,138,125,.2);
            color: #fff;
            border-bottom-color: var(--accent);
            font-weight: 700;
        }
        .nav-cta { margin-left: 4px; }
        .nav-toggle {
            display: none;
            background: transparent;
            border: none;
            color: #fff;
            font-size: 24px;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
        }
        .nav-toggle:hover { background: rgba(255,255,255,.1); }

        /* Banner */
        .cat-banner {
            position: relative;
            height: 320px;
            background-image: linear-gradient(to right, rgba(20,32,31,.92) 0%, rgba(20,32,31,.6) 55%, rgba(20,32,31,.1) 100%), url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: center;
        }
        .cat-banner-content {
            position: relative;
            z-index: 2;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }
        .cat-banner-content h1 {
            color: #fff;
            font-size: 38px;
            font-weight: 900;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
            text-shadow: 0 2px 16px rgba(0,0,0,.3);
        }
        .cat-banner-content p {
            color: rgba(255,255,255,.85);
            font-size: 16px;
            max-width: 520px;
            margin-bottom: 24px;
            line-height: 1.8;
        }
        .cat-banner .breadcrumb {
            font-size: 13px;
            color: rgba(255,255,255,.7);
            margin-bottom: 20px;
        }
        .cat-banner .breadcrumb a {
            color: rgba(255,255,255,.85);
            text-decoration: none;
        }
        .cat-banner .breadcrumb a:hover { color: #fff; }
        .cat-banner .breadcrumb span {
            margin: 0 8px;
            color: rgba(255,255,255,.4);
        }

        /* Feature Cards */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 28px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .feature-card .card-img {
            border-radius: var(--radius-sm);
            overflow: hidden;
            margin-bottom: 20px;
            position: relative;
            background: #ececec;
            aspect-ratio: 16/9;
        }
        .feature-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .feature-card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            background: rgba(15,138,125,.12);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 22px;
            margin-bottom: 16px;
        }
        .feature-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--ink-dark);
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .feature-card p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.8;
            flex: 1;
            margin-bottom: 16px;
        }
        .feature-card .card-link {
            font-size: 14px;
            font-weight: 700;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            text-decoration: none;
        }
        .feature-card .card-link:hover { color: var(--primary-dark); }
        .feature-card .card-link i { font-size: 12px; transition: transform .2s; }
        .feature-card .card-link:hover i { transform: translateX(4px); }

        /* Process Section */
        .process-section {
            background: var(--deep);
            color: #fff;
        }
        .process-section .section-head h2 { color: #fff; }
        .process-section .section-head p { color: #9AA8A5; }
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 10px;
        }
        .process-step {
            background: rgba(255,255,255,.06);
            border-radius: var(--radius);
            padding: 28px 24px;
            border-top: 3px solid var(--primary);
            transition: var(--transition);
        }
        .process-step:hover {
            background: rgba(255,255,255,.1);
            transform: translateY(-4px);
        }
        .step-number {
            font-family: 'Roboto Mono', monospace;
            font-size: 28px;
            font-weight: 700;
            color: var(--accent);
            display: block;
            margin-bottom: 12px;
        }
        .process-step h3 {
            font-size: 17px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }
        .process-step p {
            font-size: 13px;
            color: #9AA8A5;
            line-height: 1.7;
        }

        /* Scenario Section */
        .scenario-wrap {
            display: grid;
            grid-template-columns: 5fr 7fr;
            gap: 48px;
            align-items: center;
        }
        .scenario-img {
            border-radius: var(--radius);
            overflow: hidden;
            position: relative;
            min-height: 320px;
            background: #e8e6e2;
        }
        .scenario-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            position: absolute;
            inset: 0;
        }
        .scenario-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .scenario-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            background: #fff;
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            cursor: default;
        }
        .scenario-item:hover {
            transform: translateX(4px);
            box-shadow: var(--shadow-hover);
        }
        .scenario-icon {
            width: 40px;
            height: 40px;
            min-width: 40px;
            border-radius: 10px;
            background: rgba(242,107,56,.12);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
        }
        .scenario-item h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink-dark);
            margin-bottom: 4px;
        }
        .scenario-item p {
            font-size: 13px;
            color: var(--muted);
            line-height: 1.7;
        }

        /* FAQ Section */
        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
        }
        .accordion .accordion-item {
            background: #fff;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-card);
            margin-bottom: 14px;
            overflow: hidden;
            border: none;
        }
        .accordion .accordion-title {
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 700;
            color: var(--ink-dark);
            background: #fff;
            border: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            position: relative;
        }
        .accordion .accordion-title::after {
            content: '+';
            font-family: 'Roboto Mono', monospace;
            font-size: 22px;
            color: var(--accent);
            transition: transform .3s ease;
            flex-shrink: 0;
            margin-left: 12px;
        }
        .accordion .accordion-title:hover::after {
            transform: rotate(90deg);
        }
        .accordion .accordion-item.is-active .accordion-title::after {
            content: '×';
            transform: rotate(0deg);
        }
        .accordion .accordion-content {
            border: none;
            background: #fff;
            padding: 0 24px 20px;
            color: var(--muted);
            font-size: 14px;
            line-height: 1.8;
        }
        .accordion .accordion-content p {
            border-top: 1px solid var(--border);
            padding-top: 14px;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, var(--deep) 0%, #1D2A28 100%);
            text-align: center;
            padding: 88px 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -80px;
            width: 260px;
            height: 260px;
            border-radius: 50%;
            background: rgba(15,138,125,.15);
        }
        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -60px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(242,107,56,.12);
        }
        .cta-content {
            position: relative;
            z-index: 2;
        }
        .cta-content h2 {
            color: #fff;
            font-size: 30px;
            font-weight: 800;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .cta-content p {
            color: #B8C4C2;
            font-size: 15px;
            max-width: 480px;
            margin: 0 auto 28px;
        }
        .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background: var(--deep);
            padding: 64px 0 32px;
            color: #9AA8A5;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 48px;
        }
        .footer-brand {
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            display: block;
            margin-bottom: 12px;
        }
        .footer-desc {
            font-size: 13px;
            line-height: 1.8;
            color: #9AA8A5;
        }
        .footer-title {
            display: block;
            color: #fff;
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a,
        .footer-contact span {
            font-size: 13px;
            color: #9AA8A5;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 10px;
            font-size: 13px;
        }
        .contact-icon {
            font-size: 15px;
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,.08);
            padding-top: 24px;
            text-align: center;
            font-size: 13px;
            color: #778482;
        }
        .copyright a {
            color: #9AA8A5;
            text-decoration: none;
        }
        .copyright a:hover { color: #fff; }

        /* Back to top */
        .back-to-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            box-shadow: 0 4px 16px rgba(15,138,125,.4);
            z-index: 99;
            opacity: 0;
            visibility: hidden;
            transform: translateY(12px);
            transition: var(--transition);
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .back-to-top:hover {
            background: var(--primary-dark);
            color: #fff;
        }

        /* Responsive */
        @media screen and (max-width: 64em) {
            .feature-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; }
            .process-grid { grid-template-columns: repeat(2, 1fr); }
            .scenario-wrap { grid-template-columns: 1fr; gap: 32px; }
            .scenario-img { min-height: 260px; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
        }
        @media screen and (min-width: 40.063em) and (max-width: 64em) {
            .feature-grid { grid-template-columns: repeat(3, 1fr); }
        }
        @media screen and (max-width: 40em) {
            .section { padding: 56px 0; }
            .container { padding: 0 20px; }
            .cat-banner { height: 260px; }
            .cat-banner-content h1 { font-size: 26px; }
            .cat-banner-content p { font-size: 14px; }
            .feature-grid { grid-template-columns: 1fr; }
            .process-grid { grid-template-columns: 1fr; }
            .section-head h2 { font-size: 24px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
            .footer-col:first-child { grid-column: 1 / -1; }
            .nav-toggle { display: block; }
            .nav-links {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 8px;
                padding: 16px 0 8px;
            }
            .nav-links.open { display: flex; }
            .nav-card {
                width: 100%;
                text-align: center;
                padding: 12px;
                border-bottom: none;
                border-left: 3px solid transparent;
            }
            .nav-card.active {
                border-bottom: none;
                border-left-color: var(--accent);
            }
            .nav-cta { display: none; }
        }

        /* Utility */
        .mt-1 { margin-top: 8px; }
        .mt-2 { margin-top: 16px; }
        .img-fallback {
            background: #ececec;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #aaa;
            font-size: 28px;
            position: relative;
        }
        .img-fallback::after {
            content: '🖼️';
            font-size: 32px;
        }