/* roulang page: index */
:root {
      --primary-dark: #0f172a;
      --secondary-dark: #1e293b;
      --navy-deep: #0b0f19;
      --cyan-accent: #06b6d4;
      --sky-blue: #0ea5e9;
      --alert-orange: #f97316;
      --bg-light: #f8fafc;
      --bg-white: #ffffff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 6px 20px -4px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 12px 30px -6px rgba(15, 23, 42, 0.12);
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

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

    /* 顶部通栏 */
    .topbar {
      background-color: var(--navy-deep);
      color: #94a3b8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .topbar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
    }
    .topbar-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--cyan-accent);
    }
    .topbar-dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--cyan-accent);
      box-shadow: 0 0 6px var(--cyan-accent);
    }

    /* 导航栏 */
    .header {
      background-color: #ffffff;
      position: sticky;
      top: 0;
      z-index: 1000;
      box-shadow: 0 1px 10px rgba(0, 0, 0, 0.05);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 74px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }
    .logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--sky-blue), var(--cyan-accent));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 900;
      font-size: 18px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--secondary-dark);
      padding: 8px 0;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--sky-blue);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--sky-blue);
      border-radius: 2px;
    }
    .nav-cta {
      background-color: var(--primary-dark);
      color: #fff !important;
      padding: 10px 22px !important;
      border-radius: var(--radius-sm);
      font-weight: 600;
      display: inline-block;
      min-height: 44px;
      display: inline-flex;
      align-items: center;
    }
    .nav-cta:hover {
      background-color: var(--sky-blue);
      box-shadow: 0 4px 12px rgba(14, 165, 233, 0.35);
    }

    /* 通用板块与排版 */
    section {
      padding: 80px 0;
      position: relative;
    }
    .section-dark {
      background-color: var(--navy-deep);
      color: #f1f5f9;
    }
    .section-light {
      background-color: var(--bg-white);
    }
    .section-gray {
      background-color: var(--bg-light);
    }
    .section-header {
      margin-bottom: 48px;
      text-align: center;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      background: rgba(6, 182, 212, 0.1);
      color: var(--sky-blue);
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-dark .section-badge {
      background: rgba(6, 182, 212, 0.15);
      color: var(--cyan-accent);
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary-dark);
      line-height: 1.35;
      margin-bottom: 14px;
    }
    .section-dark .section-title {
      color: #ffffff;
    }
    .section-desc {
      max-width: 760px;
      margin: 0 auto;
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.8;
    }
    .section-dark .section-desc {
      color: #94a3b8;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 600;
      min-height: 46px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--sky-blue), var(--cyan-accent));
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(14, 165, 233, 0.3);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #0284c7, #0891b2);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(14, 165, 233, 0.45);
    }
    .btn-outline {
      border-color: #cbd5e1;
      color: var(--primary-dark);
      background: #ffffff;
    }
    .btn-outline:hover {
      border-color: var(--sky-blue);
      color: var(--sky-blue);
      background: rgba(14, 165, 233, 0.04);
    }
    .btn-outline-white {
      border-color: rgba(255, 255, 255, 0.3);
      color: #ffffff;
      background: transparent;
    }
    .btn-outline-white:hover {
      border-color: var(--cyan-accent);
      color: var(--cyan-accent);
      background: rgba(6, 182, 212, 0.1);
    }

    /* 1. Hero 工业参数首屏 */
    .hero-banner {
      position: relative;
      background-color: var(--navy-deep);
      background-image: linear-gradient(rgba(11, 15, 25, 0.88), rgba(11, 15, 25, 0.94)), url('/assets/images/2472e284f7406d5c.webp');
      background-size: cover;
      background-position: center;
      padding: 100px 0 80px 0;
      color: #ffffff;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .hero-layout {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 50px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 42px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-content h1 span {
      background: linear-gradient(90deg, #38bdf8, #2dd4bf);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-intro {
      font-size: 16px;
      color: #cbd5e1;
      line-height: 1.85;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .hero-spec-card {
      background: rgba(30, 41, 59, 0.7);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    }
    .spec-card-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 20px;
      padding-bottom: 12px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .spec-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .spec-item {
      background: rgba(15, 23, 42, 0.6);
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border-left: 3px solid var(--cyan-accent);
    }
    .spec-item-label {
      font-size: 12px;
      color: #94a3b8;
      display: block;
      margin-bottom: 4px;
    }
    .spec-item-val {
      font-size: 16px;
      font-weight: 700;
      color: #f8fafc;
    }

    /* 指标栏 */
    .hero-metrics-bar {
      margin-top: 40px;
      padding-top: 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .metric-unit {
      text-align: left;
    }
    .metric-num {
      font-size: 28px;
      font-weight: 800;
      color: var(--cyan-accent);
      display: block;
      line-height: 1.2;
    }
    .metric-label {
      font-size: 13px;
      color: #94a3b8;
    }

    /* 2. 快速搜索与参数入口 */
    .section-search-hub {
      background: #ffffff;
      padding: 40px 0;
      box-shadow: var(--shadow-sm);
    }
    .search-hub-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: var(--bg-light);
      padding: 16px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      gap: 20px;
      flex-wrap: wrap;
    }
    .search-input-group {
      display: flex;
      align-items: center;
      gap: 12px;
      flex: 1;
      min-width: 280px;
    }
    .search-tag-cloud {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
    }
    .search-tag {
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-main);
    }
    .search-tag:hover {
      border-color: var(--sky-blue);
      color: var(--sky-blue);
    }

    /* 3. 分类矩阵 */
    .category-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .category-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .category-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--sky-blue);
    }
    .category-img-box {
      height: 200px;
      position: relative;
      overflow: hidden;
    }
    .category-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .category-card:hover .category-img-box img {
      transform: scale(1.05);
    }
    .category-content {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .category-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--primary-dark);
    }
    .category-desc {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 18px;
      line-height: 1.65;
      flex: 1;
    }
    .category-footer {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-top: 14px;
      border-top: 1px solid var(--border-color);
      font-size: 13px;
      color: var(--sky-blue);
      font-weight: 600;
    }

    /* 4. 精选车载硬件清单 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .product-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: var(--cyan-accent);
    }
    .product-thumb {
      height: 220px;
      position: relative;
      overflow: hidden;
      background-color: var(--secondary-dark);
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .product-badge {
      position: absolute;
      top: 12px;
      left: 12px;
      background: var(--primary-dark);
      color: #ffffff;
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 600;
    }
    .product-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }
    .product-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 10px;
    }
    .product-tags {
      display: flex;
      gap: 8px;
      margin-bottom: 14px;
      flex-wrap: wrap;
    }
    .product-tag {
      background: rgba(14, 165, 233, 0.08);
      color: var(--sky-blue);
      padding: 3px 8px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 500;
    }
    .product-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      flex: 1;
    }
    .product-specs-list {
      list-style: none;
      margin-bottom: 20px;
      background: var(--bg-light);
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      font-size: 13px;
    }
    .product-specs-list li {
      margin-bottom: 6px;
      display: flex;
      justify-content: space-between;
    }
    .product-specs-list li:last-child {
      margin-bottom: 0;
    }
    .spec-k {
      color: var(--text-muted);
    }
    .spec-v {
      font-weight: 600;
      color: var(--primary-dark);
    }

    /* 5. 技术深度解析 (Dark Mode) */
    .tech-deep-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .tech-card-box {
      background: rgba(30, 41, 59, 0.6);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-bottom: 16px;
    }
    .tech-card-box h4 {
      color: var(--cyan-accent);
      font-size: 16px;
      margin-bottom: 8px;
    }
    .tech-card-box p {
      font-size: 14px;
      color: #94a3b8;
      line-height: 1.6;
    }

    /* 6. 场景化系统展示 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .scenario-item {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 30px 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .scenario-num {
      font-size: 36px;
      font-weight: 900;
      color: rgba(14, 165, 233, 0.15);
      position: absolute;
      top: 16px;
      right: 20px;
    }
    .scenario-item h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 12px;
    }
    .scenario-item p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 7. 性能与排行榜模块 */
    .rank-table-wrap {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .rank-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }
    .rank-table th {
      background: var(--secondary-dark);
      color: #ffffff;
      padding: 16px 20px;
      font-weight: 600;
    }
    .rank-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      color: var(--text-main);
    }
    .rank-table tr:hover td {
      background-color: var(--bg-light);
    }
    .rank-tag {
      display: inline-block;
      padding: 2px 8px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 600;
    }
    .rank-tag-hot {
      background: #fee2e2;
      color: #ef4444;
    }
    .rank-tag-norm {
      background: #e0f2fe;
      color: #0284c7;
    }

    /* 8. 白皮书与技术资料获客区 */
    .whitepaper-box {
      background: linear-gradient(135deg, var(--secondary-dark), var(--primary-dark));
      border-radius: var(--radius-lg);
      padding: 48px;
      color: #ffffff;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .whitepaper-info h3 {
      font-size: 26px;
      font-weight: 700;
      margin-bottom: 16px;
      color: #ffffff;
    }
    .whitepaper-info p {
      font-size: 14px;
      color: #cbd5e1;
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .download-form {
      background: rgba(15, 23, 42, 0.6);
      padding: 30px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 13px;
      color: #cbd5e1;
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(255, 255, 255, 0.05);
      color: #ffffff;
      font-size: 14px;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--cyan-accent);
      background: rgba(255, 255, 255, 0.1);
    }

    /* 9. 真实用户口碑评价 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .review-stars {
      color: #f59e0b;
      font-size: 16px;
      margin-bottom: 12px;
    }
    .review-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      flex: 1;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      padding-top: 14px;
      border-top: 1px solid var(--border-color);
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--sky-blue);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }
    .author-meta h5 {
      font-size: 14px;
      color: var(--primary-dark);
    }
    .author-meta span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 10. 资讯列表与技术文献 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: all 0.3s ease;
    }
    .news-card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--sky-blue);
    }
    .news-cover {
      height: 180px;
      position: relative;
    }
    .news-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .news-body {
      padding: 20px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      flex: 1;
      margin-bottom: 16px;
    }

    /* 11. FAQ 手风琴 */
    .faq-container {
      max-width: 840px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 16px;
      color: var(--primary-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background-color: #fff;
    }
    .faq-answer {
      padding: 0 24px 20px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.75;
      border-top: 1px solid transparent;
    }

    /* 12. 转化行动区 */
    .cta-container {
      background: linear-gradient(135deg, var(--navy-deep), var(--secondary-dark));
      border-radius: var(--radius-lg);
      padding: 60px 40px;
      text-align: center;
      color: #ffffff;
      border: 1px solid rgba(255, 255, 255, 0.1);
      box-shadow: var(--shadow-lg);
    }
    .cta-container h2 {
      font-size: 32px;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .cta-container p {
      max-width: 680px;
      margin: 0 auto 30px auto;
      font-size: 15px;
      color: #cbd5e1;
      line-height: 1.8;
    }
    .cta-btns {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
    }

    /* 页脚统一规范 */
    .footer {
      background-color: var(--navy-deep);
      color: #94a3b8;
      padding: 70px 0 30px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: var(--cyan-accent);
    }
    .footer-contact-item {
      margin-bottom: 12px;
      line-height: 1.6;
    }
    .footer-bottom {
      padding-top: 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
    }

    /* 移动端与自适应断点 */
    @media (max-width: 1024px) {
      .hero-layout {
        grid-template-columns: 1fr;
      }
      .category-grid,
      .product-grid,
      .scenario-grid,
      .reviews-grid,
      .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .whitepaper-box {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hero-content h1 {
        font-size: 30px;
      }
      .hero-metrics-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .category-grid,
      .product-grid,
      .scenario-grid,
      .reviews-grid,
      .news-grid {
        grid-template-columns: 1fr;
      }
      .tech-deep-layout {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .cta-container {
        padding: 40px 20px;
      }
    }