/* roulang page: index */
:root {
      --primary: #0A192F;
      --primary-light: #172A45;
      --accent-cyan: #00E5FF;
      --accent-orange: #FF6B00;
      --bg-main: #F8FAFC;
      --bg-dark: #050B14;
      --bg-card: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-light: #64748B;
      --border-color: #E2E8F0;
      --border-dark: rgba(0, 229, 255, 0.2);
      --radius-sm: 4px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --shadow-sm: 0 4px 20px -2px rgba(10, 25, 47, 0.05);
      --shadow-hover: 0 12px 28px -4px rgba(0, 229, 255, 0.18);
    }

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

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部双行导航 */
    .top-bar {
      background-color: #030812;
      color: #94A3B8;
      font-size: 13px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      padding: 6px 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--accent-cyan);
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent-cyan);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent-cyan);
    }
    .top-contacts {
      display: flex;
      gap: 20px;
    }
    .top-contacts a:hover {
      color: #FFFFFF;
    }

    .site-header {
      background-color: rgba(10, 25, 47, 0.95);
      backdrop-filter: blur(12px);
      position: sticky;
      top: 0;
      z-index: 1000;
      border-bottom: 1px solid rgba(0, 229, 255, 0.15);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 20px;
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: 0.5px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--accent-cyan), #0072FF);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #050B14;
      font-weight: 900;
      font-size: 16px;
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-link {
      color: #E2E8F0;
      font-size: 15px;
      font-weight: 500;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent-cyan);
    }
    .btn-nav {
      background: var(--accent-orange);
      color: #FFFFFF;
      padding: 8px 18px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      transition: background 0.2s ease, transform 0.2s ease;
    }
    .btn-nav:hover {
      background: #E05E00;
      transform: translateY(-1px);
    }

    /* 移动端菜单按钮 */
    .mobile-toggle {
      display: none;
      background: transparent;
      border: none;
      color: #FFFFFF;
      font-size: 24px;
      cursor: pointer;
    }

    /* 板块公用 */
    section {
      padding: 80px 0;
      position: relative;
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: #FFFFFF;
    }
    .section-light {
      background-color: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      position: relative;
      display: inline-block;
      margin-bottom: 12px;
    }
    .section-dark .section-title {
      color: #FFFFFF;
    }
    .section-title::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: -6px;
      width: 48px;
      height: 4px;
      background: var(--accent-cyan);
      border-radius: 2px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 800px;
    }
    .section-dark .section-desc {
      color: #94A3B8;
    }

    /* 板块 1: 全宽浅色顶栏 + 矮横幅 Hero Banner */
    #hero {
      padding: 50px 0 60px;
      background: linear-gradient(rgba(10, 25, 47, 0.88), rgba(10, 25, 47, 0.94)), url('/assets/images/e2641b4daa1d7537.png') center/cover no-repeat;
      color: #FFFFFF;
    }
    .hero-strip {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 38px;
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 18px;
      color: #FFFFFF;
    }
    .hero-content p {
      font-size: 16px;
      color: #CBD5E1;
      margin-bottom: 24px;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 24px;
    }
    .btn-primary {
      background: var(--accent-cyan);
      color: var(--primary);
      padding: 12px 26px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 15px;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #33EBFF;
      transform: translateY(-2px);
      box-shadow: 0 4px 16px rgba(0, 229, 255, 0.4);
    }
    .btn-outline {
      border: 1px solid rgba(255, 255, 255, 0.3);
      color: #FFFFFF;
      padding: 12px 26px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
    }
    .btn-outline:hover {
      border-color: var(--accent-cyan);
      color: var(--accent-cyan);
    }
    .hero-stats-row {
      display: flex;
      gap: 32px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 18px;
    }
    .hero-stat-item b {
      font-size: 22px;
      color: var(--accent-cyan);
      display: block;
    }
    .hero-stat-item span {
      font-size: 13px;
      color: #94A3B8;
    }
    .hero-visual-card {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(0, 229, 255, 0.3);
      border-radius: var(--radius-md);
      padding: 20px;
      backdrop-filter: blur(10px);
    }
    .hero-visual-card img {
      border-radius: var(--radius-sm);
      width: 100%;
      height: 220px;
      object-fit: cover;
      margin-bottom: 14px;
    }
    .hero-card-meta {
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      color: #94A3B8;
    }

    /* 板块 2: 底层架构 Platform Overview */
    .overview-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .overview-img-wrap {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .overview-specs {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 24px;
    }
    .spec-box {
      background: #F1F5F9;
      padding: 16px;
      border-radius: var(--radius-sm);
      border-left: 3px solid var(--accent-cyan);
    }
    .spec-box h4 {
      font-size: 15px;
      margin-bottom: 4px;
    }
    .spec-box p {
      font-size: 13px;
      color: var(--text-light);
    }

    /* 板块 3: 核心优势矩阵 Core Advantages (2x3 Grid) */
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0, 229, 255, 0.4);
    }
    .adv-icon-badge {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: rgba(0, 229, 255, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .adv-card h3 {
      font-size: 19px;
      margin-bottom: 10px;
    }
    .adv-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 4: 硬件驾驶舱终端 Terminal Products */
    .terminal-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .terminal-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .terminal-thumb {
      height: 190px;
      overflow: hidden;
    }
    .terminal-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .terminal-card:hover .terminal-thumb img {
      transform: scale(1.05);
    }
    .terminal-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .terminal-tag {
      font-size: 12px;
      background: #F1F5F9;
      color: var(--text-muted);
      padding: 3px 8px;
      border-radius: var(--radius-sm);
      display: inline-block;
      margin-bottom: 12px;
      align-self: flex-start;
    }
    .terminal-body h3 {
      font-size: 18px;
      margin-bottom: 8px;
    }
    .terminal-body p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .terminal-meta-list {
      border-top: 1px solid #EDF2F7;
      padding-top: 14px;
      font-size: 13px;
      color: var(--text-light);
    }

    /* 板块 5: 实战大屏 Live Command Demo (深色高对比) */
    .demo-wrapper {
      background: #02060D;
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: 0 10px 40px rgba(0, 229, 255, 0.1);
    }
    .demo-screen-img {
      border-radius: var(--radius-md);
      overflow: hidden;
      margin-bottom: 24px;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .demo-control-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .control-metric {
      background: rgba(255, 255, 255, 0.04);
      padding: 16px;
      border-radius: var(--radius-sm);
      border-left: 2px solid var(--accent-orange);
    }
    .control-metric span {
      display: block;
      font-size: 13px;
      color: #94A3B8;
    }
    .control-metric b {
      font-size: 20px;
      color: #FFFFFF;
    }

    /* 板块 6: 落地实录与对比 Customer Stories */
    .story-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      margin-bottom: 28px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }
    .story-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 16px;
      font-size: 14px;
    }
    .story-table th, .story-table td {
      border: 1px solid var(--border-color);
      padding: 10px 14px;
      text-align: left;
    }
    .story-table th {
      background: #F8FAFC;
    }

    /* 板块 7: 关键效能数据 Key Metrics Bar */
    .metrics-bar-section {
      background: var(--primary);
      color: #FFFFFF;
      padding: 50px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-col-val {
      font-size: 40px;
      font-weight: 800;
      color: var(--accent-cyan);
      margin-bottom: 6px;
      line-height: 1.1;
    }
    .metric-col-label {
      font-size: 15px;
      color: #E2E8F0;
    }

    /* 板块 8: 部署流程 Workflow */
    .workflow-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .step-number {
      font-size: 28px;
      font-weight: 800;
      color: var(--accent-cyan);
      margin-bottom: 8px;
    }
    .step-box h3 {
      font-size: 17px;
      margin-bottom: 8px;
    }
    .step-box p {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 板块 9: 评价反馈 Testimonials */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testi-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .testi-stars {
      color: var(--accent-orange);
      font-size: 14px;
      margin-bottom: 12px;
    }
    .testi-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .testi-author {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
    }
    .testi-role {
      font-size: 12px;
      color: var(--text-light);
    }

    /* 板块 10: 行业动态 Insights & Trends */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .news-cover {
      height: 170px;
    }
    .news-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .news-content {
      padding: 20px;
      flex-grow: 1;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 6px;
    }
    .news-content h3 {
      font-size: 17px;
      margin-bottom: 8px;
      line-height: 1.4;
    }
    .news-content p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 14px;
    }
    .news-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--accent-orange);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 板块 11: 常见问题 FAQ Accordion */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-card);
      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;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFFFFF;
      user-select: none;
    }
    .faq-question:hover {
      background: #F8FAFC;
    }
    .faq-toggle-icon {
      font-size: 18px;
      color: var(--text-light);
      transition: transform 0.25s ease;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #FAFAFA;
      padding: 0 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
      color: var(--accent-orange);
    }

    /* 板块 12: 转化区块 Contact Action CTA */
    .cta-card-box {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      border-radius: var(--radius-lg);
      padding: 48px;
      color: #FFFFFF;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .cta-info h2 {
      font-size: 30px;
      margin-bottom: 16px;
      color: #FFFFFF;
    }
    .cta-info p {
      color: #CBD5E1;
      font-size: 15px;
      margin-bottom: 24px;
    }
    .cta-form {
      background: #FFFFFF;
      padding: 28px;
      border-radius: var(--radius-md);
      color: var(--text-main);
    }
    .form-group {
      margin-bottom: 14px;
    }
    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 6px;
    }
    .form-group input, .form-group select {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
    }
    .form-group input:focus, .form-group select:focus {
      border-color: var(--accent-cyan);
    }
    .btn-submit {
      width: 100%;
      background: var(--accent-orange);
      color: #FFFFFF;
      border: none;
      padding: 12px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 15px;
      cursor: pointer;
      transition: background 0.2s ease;
    }
    .btn-submit:hover {
      background: #E05E00;
    }

    /* 统一页脚 */
    .site-footer {
      background-color: #03070E;
      color: #94A3B8;
      padding: 60px 0 24px;
      font-size: 14px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 16px;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: var(--accent-cyan);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-strip {
        grid-template-columns: 1fr;
      }
      .grid-3x2, .terminal-grid, .news-grid, .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .workflow-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .story-card {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-contacts {
        display: none;
      }
      .main-nav {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--primary);
        padding: 20px;
        gap: 16px;
        border-bottom: 1px solid rgba(0, 229, 255, 0.2);
      }
      .main-nav.show {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .overview-grid, .cta-card-box {
        grid-template-columns: 1fr;
      }
      .metrics-grid, .demo-control-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3x2, .terminal-grid, .news-grid, .testimonial-grid, .workflow-timeline {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }