/* roulang page: index */
:root {
      --primary: #11161f;
      --primary-dark: #0b0e14;
      --accent: #00bfa5;
      --accent-hover: #00d2b4;
      --bg-light: #ffffff;
      --bg-alt: #f7f9fa;
      --bg-dark: #0e1217;
      --text-main: #0d1117;
      --text-muted: #4a5568;
      --text-light: #718096;
      --border-color: rgba(226, 232, 240, 0.9);
      --border-dark: rgba(255, 255, 255, 0.12);
      --radius-sm: 4px;
      --radius-md: 6px;
      --radius-lg: 8px;
      --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 12px rgba(17, 22, 31, 0.08);
      --shadow-lg: 0 12px 28px rgba(17, 22, 31, 0.12);
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }

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

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

    input, select, button, textarea {
      font-family: inherit;
      font-size: 1rem;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部双行导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

    .top-bar {
      background-color: var(--primary-dark);
      color: #94a3b8;
      font-size: 0.8125rem;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .main-nav {
      padding: 14px 0;
    }

    .main-nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--primary);
      letter-spacing: -0.02em;
    }

    .brand-badge {
      display: inline-block;
      background: var(--accent);
      color: #04241e;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: var(--radius-sm);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }

    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-muted);
    }

    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 0.9375rem;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
      gap: 8px;
    }

    .btn-primary {
      background-color: var(--accent);
      color: #042621;
      border-color: var(--accent);
    }

    .btn-primary:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 4px 14px rgba(0, 191, 165, 0.35);
    }

    .btn-outline {
      background: transparent;
      color: #ffffff;
      border-color: rgba(255, 255, 255, 0.35);
    }

    .btn-outline:hover {
      border-color: #ffffff;
      background: rgba(255, 255, 255, 0.05);
    }

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

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

    /* 板块通用 */
    .section-wrap {
      padding: 88px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-wrap.bg-alt {
      background-color: var(--bg-alt);
    }

    .section-wrap.bg-dark {
      background-color: var(--bg-dark);
      color: #ffffff;
      border-bottom-color: var(--border-dark);
    }

    .section-head {
      margin-bottom: 48px;
      max-width: 820px;
    }

    .section-head.center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--accent);
      margin-bottom: 10px;
    }

    .section-title {
      font-size: 2.125rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.3;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .bg-dark .section-desc {
      color: #94a3b8;
    }

    /* 1. Hero 蓝图：白皮书获客与系统规格 */
    .hero-section {
      background: linear-gradient(135deg, rgba(11, 14, 20, 0.94) 0%, rgba(17, 22, 31, 0.92) 100%),
                  url('/assets/images/aafb1b298ac27441.webp') center/cover no-repeat;
      color: #ffffff;
      padding: 96px 0 110px;
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.25fr 1fr;
      gap: 56px;
      align-items: center;
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.22;
      letter-spacing: -0.03em;
      margin-bottom: 22px;
    }

    .hero-lead {
      font-size: 1.125rem;
      color: #cbd5e1;
      line-height: 1.75;
      margin-bottom: 32px;
    }

    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 36px;
    }

    .hero-tag-item {
      font-size: 0.875rem;
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.15);
      padding: 6px 14px;
      border-radius: var(--radius-sm);
    }

    .hero-action {
      display: flex;
      gap: 16px;
      align-items: center;
    }

    /* 白皮书下载获客卡片 */
    .whitepaper-card {
      background: rgba(14, 18, 23, 0.88);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
      position: relative;
    }

    .whitepaper-badge {
      position: absolute;
      top: 18px;
      right: 18px;
      background: var(--accent);
      color: #03211b;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: var(--radius-sm);
    }

    .whitepaper-meta {
      font-size: 0.875rem;
      color: #94a3b8;
      margin-bottom: 16px;
    }

    .whitepaper-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 12px;
      line-height: 1.4;
    }

    .whitepaper-toc {
      list-style: none;
      margin-bottom: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 16px;
    }

    .whitepaper-toc li {
      font-size: 0.875rem;
      color: #cbd5e1;
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .whitepaper-toc li::before {
      content: "•";
      color: var(--accent);
      font-weight: bold;
    }

    .form-group {
      margin-bottom: 14px;
    }

    .form-control {
      width: 100%;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.18);
      color: #ffffff;
      padding: 12px 14px;
      border-radius: var(--radius-sm);
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 2px rgba(0, 191, 165, 0.2);
    }

    /* 2. 搜索与功能直达入口 */
    .search-gateway {
      background-color: #ffffff;
      transform: translateY(-30px);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      padding: 24px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .gateway-item {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .gateway-icon {
      width: 44px;
      height: 44px;
      background: var(--bg-alt);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: bold;
    }

    .gateway-text h4 {
      font-size: 1rem;
      font-weight: 700;
    }

    .gateway-text p {
      font-size: 0.8125rem;
      color: var(--text-light);
    }

    /* 3. 架构与分类矩阵 (3x2 栅格) */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .card-feature {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      transition: var(--transition);
      position: relative;
    }

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

    .card-feature-index {
      font-size: 0.8125rem;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 12px;
    }

    .card-feature-title {
      font-size: 1.1875rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--primary);
    }

    .card-feature-desc {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 4. 精选检测解决方案清单 (图文 3 列) */
    .solution-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(0, 191, 165, 0.4);
    }

    .solution-thumb {
      height: 200px;
      overflow: hidden;
      position: relative;
    }

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

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

    .solution-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    .solution-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--primary);
    }

    .solution-desc {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
      flex-grow: 1;
    }

    .solution-specs {
      list-style: none;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
      margin-bottom: 18px;
    }

    .solution-specs li {
      font-size: 0.8125rem;
      color: var(--text-light);
      margin-bottom: 6px;
      display: flex;
      justify-content: space-between;
    }

    /* 5. 深色硬核技术原理图解 */
    .tech-spec-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .spec-points {
      list-style: none;
    }

    .spec-item {
      margin-bottom: 24px;
      border-left: 2px solid rgba(255, 255, 255, 0.15);
      padding-left: 20px;
      transition: var(--transition);
    }

    .spec-item:hover {
      border-left-color: var(--accent);
    }

    .spec-item h4 {
      font-size: 1.125rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 6px;
    }

    .spec-item p {
      font-size: 0.9375rem;
      color: #94a3b8;
      line-height: 1.6;
    }

    .tech-console-box {
      background: #06080a;
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      font-family: monospace;
      color: #a5f3fc;
      font-size: 0.875rem;
      line-height: 1.7;
    }

    .console-header {
      display: flex;
      align-items: center;
      gap: 8px;
      padding-bottom: 12px;
      margin-bottom: 14px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #ef4444;
      display: inline-block;
    }

    .dot.yellow { background: #eab308; }
    .dot.green { background: #22c55e; }

    /* 6. 关键数据条 */
    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
    }

    .metric-col {
      padding: 36px 24px;
      text-align: center;
      border-right: 1px solid var(--border-color);
    }

    .metric-col:last-child {
      border-right: none;
    }

    .metric-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
      letter-spacing: -0.03em;
    }

    .metric-number span {
      color: var(--accent);
      font-size: 1.5rem;
    }

    .metric-label {
      font-size: 0.875rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 7. 排行列表 / 精度基准 (Compact Table) */
    .benchmark-table {
      width: 100%;
      border-collapse: collapse;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
    }

    .benchmark-table th {
      background: var(--bg-alt);
      padding: 14px 20px;
      text-align: left;
      font-size: 0.875rem;
      font-weight: 700;
      color: var(--primary);
      border-bottom: 1px solid var(--border-color);
    }

    .benchmark-table td {
      padding: 16px 20px;
      font-size: 0.9375rem;
      color: var(--text-muted);
      border-bottom: 1px solid var(--border-color);
    }

    .benchmark-table tr:last-child td {
      border-bottom: none;
    }

    .status-badge {
      display: inline-block;
      padding: 3px 8px;
      font-size: 0.75rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      background: rgba(0, 191, 165, 0.12);
      color: #008775;
    }

    /* 8. 场景对比：传统人工 vs 汽车AI检测软件 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .compare-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      background: #ffffff;
    }

    .compare-card.highlight {
      border-color: var(--accent);
      background: #fcfffe;
      position: relative;
    }

    .compare-card h3 {
      font-size: 1.25rem;
      margin-bottom: 20px;
    }

    .compare-list {
      list-style: none;
    }

    .compare-list li {
      padding: 12px 0;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.9375rem;
      display: flex;
      gap: 12px;
    }

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

    /* 9. 资源中心与白皮书索引 */
    .resource-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .resource-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .resource-type {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--text-light);
      margin-bottom: 8px;
    }

    .resource-title {
      font-size: 1.125rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--primary);
    }

    .resource-summary {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.6;
    }

    /* 10. 专题技术资讯列表 */
    .news-card {
      display: flex;
      gap: 24px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      margin-bottom: 20px;
      transition: var(--transition);
    }

    .news-card:hover {
      box-shadow: var(--shadow-sm);
      border-color: rgba(0, 191, 165, 0.5);
    }

    .news-img {
      width: 240px;
      flex-shrink: 0;
    }

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

    .news-content {
      padding: 20px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .news-date {
      font-size: 0.8125rem;
      color: var(--text-light);
      margin-bottom: 6px;
    }

    .news-heading {
      font-size: 1.125rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--primary);
    }

    .news-abstract {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 11. 用户口碑评价 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      position: relative;
    }

    .testimonial-quote {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }

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

    .author-info h4 {
      font-size: 0.9375rem;
      font-weight: 700;
    }

    .author-info p {
      font-size: 0.8125rem;
      color: var(--text-light);
    }

    /* 12. 认证与合作伙伴墙 */
    .partner-wall {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .partner-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 20px;
      text-align: center;
      font-size: 0.9375rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    /* 13. FAQ 常见解答 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      background: #ffffff;
      overflow: hidden;
    }

    .faq-item summary {
      padding: 20px 24px;
      font-weight: 700;
      font-size: 1.0625rem;
      color: var(--primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      list-style: none;
    }

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

    .faq-item summary::after {
      content: "+";
      font-size: 1.25rem;
      color: var(--accent);
      font-weight: 400;
    }

    .faq-item[open] summary::after {
      content: "−";
    }

    .faq-answer {
      padding: 0 24px 20px;
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    /* 14. 页面唯一收口行动区 */
    .cta-banner {
      background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
      color: #ffffff;
      padding: 64px 0;
      border-radius: var(--radius-md);
      text-align: center;
    }

    .cta-banner h2 {
      font-size: 2rem;
      font-weight: 800;
      margin-bottom: 14px;
    }

    .cta-banner p {
      font-size: 1.0625rem;
      color: #cbd5e1;
      max-width: 680px;
      margin: 0 auto 28px;
    }

    /* 页脚合规规范 */
    .site-footer {
      background: var(--primary-dark);
      color: #94a3b8;
      font-size: 0.875rem;
      padding: 64px 0 28px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 48px;
    }

    .footer-brand h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 14px;
    }

    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .footer-links h4 {
      font-size: 0.9375rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
    }

    .footer-links ul {
      list-style: none;
    }

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

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

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.8125rem;
    }

    /* 移动端汉堡菜单支持 */
    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .menu-toggle span {
      display: block;
      width: 22px;
      height: 2px;
      background: var(--primary);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .tech-spec-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .metrics-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .metric-col:nth-child(2) {
        border-right: none;
      }
      .metric-col {
        border-bottom: 1px solid var(--border-color);
      }
      .metric-col:nth-last-child(-n+2) {
        border-bottom: none;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links {
        position: fixed;
        top: 61px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 24px;
        gap: 16px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        transition: transform 0.3s ease;
      }
      .nav-links.active {
        transform: translateY(0);
      }
      .nav-cta {
        display: none;
      }
      .hero-title {
        font-size: 2rem;
      }
      .section-wrap {
        padding: 56px 0;
      }
      .grid-3, .compare-grid, .partner-wall, .resource-grid {
        grid-template-columns: 1fr;
      }
      .search-gateway {
        flex-direction: column;
        align-items: flex-start;
        transform: none;
        margin-bottom: 32px;
      }
      .news-card {
        flex-direction: column;
      }
      .news-img {
        width: 100%;
        height: 180px;
      }
      .metrics-bar {
        grid-template-columns: 1fr;
      }
      .metric-col {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }