/* roulang page: index */
:root {
      --primary: #0F2B5C;
      --primary-dark: #071630;
      --accent-green: #00D084;
      --accent-orange: #FF6A00;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0B132B;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: rgba(226, 232, 240, 0.9);
      --card-shadow: 0 4px 20px -2px rgba(15, 43, 92, 0.08);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    a { text-decoration: none; color: inherit; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; }
    button, input, select, textarea { font-family: inherit; }

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

    /* 顶部通知条与导航 */
    .top-bar {
      background: var(--primary-dark);
      color: #94A3B8;
      font-size: 0.8125rem;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .badge-live {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(0, 208, 132, 0.15);
      color: var(--accent-green);
      padding: 2px 8px;
      border-radius: 20px;
      font-weight: 600;
    }
    .badge-live::before {
      content: "";
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--accent-green);
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 1px 10px rgba(0,0,0,0.05);
      border-bottom: 1px solid var(--border-color);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 70px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--accent-orange));
      border-radius: 8px;
      display: grid;
      place-items: center;
      color: #fff;
      font-size: 1rem;
      font-weight: bold;
    }
    .nav-menu {
      display: flex;
      list-style: none;
      gap: 24px;
      align-items: center;
    }
    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 6px 0;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent-orange);
    }
    .btn-header {
      background: var(--primary);
      color: #fff;
      padding: 9px 20px;
      border-radius: 30px;
      font-size: 0.875rem;
      font-weight: 600;
    }
    .btn-header:hover {
      background: var(--accent-orange);
      transform: translateY(-1px);
    }

    /* 英雄区 (Hero) */
    .hero-section {
      position: relative;
      background: radial-gradient(circle at 80% 20%, rgba(0, 208, 132, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 10% 80%, rgba(15, 43, 92, 0.05) 0%, transparent 50%),
                  #ffffff;
      padding: 80px 0 60px;
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }
    .hero-tagline {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #EEF4FF;
      color: var(--primary);
      padding: 6px 14px;
      border-radius: 30px;
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }
    .hero-desc {
      font-size: 1.0625rem;
      line-height: 1.8;
      color: var(--text-body);
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: #fff;
      padding: 13px 28px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 4px 14px rgba(255, 106, 0, 0.3);
    }
    .btn-primary:hover {
      background: #e05d00;
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: #FFFFFF;
      color: var(--primary);
      border: 1px solid #CBD5E1;
      padding: 13px 28px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 1rem;
    }
    .btn-secondary:hover {
      background: #F1F5F9;
      border-color: #94A3B8;
    }
    .hero-visual {
      position: relative;
    }
    .hero-img-box {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 20px 40px -10px rgba(15, 43, 92, 0.2);
      border: 4px solid #ffffff;
    }
    .hero-img-box img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .hero-stat-floating {
      position: absolute;
      bottom: -20px;
      left: -20px;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      padding: 16px 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .stat-floating-num {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--accent-green);
      line-height: 1;
    }
    .stat-floating-text {
      font-size: 0.8125rem;
      color: var(--text-muted);
      line-height: 1.3;
    }

    /* 通用板块与排版 */
    section {
      padding: 80px 0;
      scroll-margin-top: 70px;
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-tag {
      color: var(--accent-orange);
      font-size: 0.875rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      display: block;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 820px;
      line-height: 1.75;
    }

    /* 1. 指标看板 (#metrics-board) */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .metric-card {
      background: #FFFFFF;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      border-color: var(--accent-green);
    }
    .metric-val {
      font-size: 2.25rem;
      font-weight: 900;
      color: var(--primary);
      margin-bottom: 6px;
      font-family: monospace, sans-serif;
    }
    .metric-label {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .metric-sub {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 2. 架构概览 (#overview) */
    .overview-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .overview-img-wrap {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-color);
    }
    .overview-img-wrap img {
      width: 100%;
      height: 360px;
      object-fit: cover;
    }
    .overview-specs {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 24px;
    }
    .spec-item {
      background: #FFFFFF;
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      border-left: 4px solid var(--primary);
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
    }
    .spec-title {
      font-size: 0.875rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .spec-val {
      font-size: 0.8125rem;
      color: var(--text-muted);
      margin-top: 2px;
    }

    /* 3. 核心功能服务矩阵 (#features) */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: #FFFFFF;
      padding: 30px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 30px -4px rgba(15, 43, 92, 0.12);
    }
    .feature-icon-bar {
      width: 46px;
      height: 46px;
      border-radius: 8px;
      background: #EEF4FF;
      color: var(--primary);
      display: grid;
      place-items: center;
      font-size: 1.25rem;
      font-weight: bold;
      margin-bottom: 20px;
    }
    .feature-title {
      font-size: 1.1875rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .feature-text {
      font-size: 0.9375rem;
      color: var(--text-body);
      line-height: 1.65;
    }

    /* 4. 场景形态 (#products) */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .product-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .product-card:hover {
      transform: translateY(-4px);
    }
    .product-card-img {
      height: 200px;
      width: 100%;
      object-fit: cover;
    }
    .product-card-body {
      padding: 24px;
    }
    .product-card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .product-card-desc {
      font-size: 0.875rem;
      color: var(--text-body);
      line-height: 1.6;
      margin-bottom: 18px;
    }
    .tag-group {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }
    .tag-pill {
      background: #F1F5F9;
      color: #475569;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 4px;
    }

    /* 5. 深色性能技术对比 (#tech-contrast) */
    .bg-dark-tech {
      background-color: var(--bg-dark);
      color: #F8FAFC;
    }
    .bg-dark-tech .section-title {
      color: #FFFFFF;
    }
    .bg-dark-tech .section-desc {
      color: #94A3B8;
    }
    .contrast-table-wrap {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      overflow-x: auto;
    }
    .contrast-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .contrast-table th, .contrast-table td {
      padding: 18px 24px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.9375rem;
    }
    .contrast-table th {
      background: rgba(255, 255, 255, 0.05);
      color: #E2E8F0;
      font-weight: 700;
    }
    .contrast-table tr:hover td {
      background: rgba(255, 255, 255, 0.02);
    }
    .text-highlight {
      color: var(--accent-green);
      font-weight: 700;
    }

    /* 6. 里程碑时间线 (#milestones) */
    .timeline {
      position: relative;
      max-width: 900px;
      margin: 0 auto;
    }
    .timeline::after {
      content: '';
      position: absolute;
      width: 2px;
      background: var(--border-color);
      top: 0;
      bottom: 0;
      left: 50%;
      margin-left: -1px;
    }
    .timeline-item {
      padding: 10px 40px;
      position: relative;
      width: 50%;
      box-sizing: border-box;
    }
    .timeline-item.left {
      left: 0;
      text-align: right;
    }
    .timeline-item.right {
      left: 50%;
      text-align: left;
    }
    .timeline-item::after {
      content: '';
      position: absolute;
      width: 16px;
      height: 16px;
      right: -8px;
      background: var(--accent-orange);
      top: 18px;
      border-radius: 50%;
      z-index: 1;
      border: 3px solid #fff;
    }
    .timeline-item.right::after {
      left: -8px;
    }
    .timeline-content {
      padding: 20px 24px;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }
    .timeline-title {
      font-size: 1.0625rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .timeline-desc {
      font-size: 0.875rem;
      color: var(--text-body);
      line-height: 1.6;
    }

    /* 7. 用户故事与案例 (#stories) */
    .story-card {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      overflow: hidden;
      align-items: center;
    }
    .story-img {
      height: 100%;
      min-height: 320px;
      width: 100%;
      object-fit: cover;
    }
    .story-body {
      padding: 36px 36px 36px 0;
    }
    .story-title {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .story-text {
      font-size: 0.9375rem;
      line-height: 1.7;
      color: var(--text-body);
      margin-bottom: 20px;
    }

    /* 8. 全网运行数据统计 (#stats) */
    .stats-bar {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #fff;
      padding: 50px 0;
      border-radius: var(--radius-lg);
    }
    .stats-flex {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 24px;
    }
    .stat-box-val {
      font-size: 2.75rem;
      font-weight: 900;
      color: var(--accent-green);
      line-height: 1.1;
      margin-bottom: 6px;
    }
    .stat-box-label {
      font-size: 0.9375rem;
      color: #CBD5E1;
    }

    /* 9. 多角色口碑反馈 (#reviews) */
    .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(--card-shadow);
    }
    .review-rating {
      color: #F59E0B;
      font-size: 1rem;
      margin-bottom: 12px;
    }
    .review-text {
      font-size: 0.9375rem;
      line-height: 1.65;
      color: var(--text-body);
      margin-bottom: 20px;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .reviewer-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #E2E8F0;
      display: grid;
      place-items: center;
      font-weight: 700;
      color: var(--primary);
    }
    .reviewer-name {
      font-size: 0.875rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .reviewer-role {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 10. 资讯动态 (#news) */
    .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;
      box-shadow: var(--card-shadow);
    }
    .news-img {
      height: 180px;
      width: 100%;
      object-fit: cover;
    }
    .news-body {
      padding: 20px;
    }
    .news-date {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-bottom: 8px;
      display: block;
    }
    .news-title {
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-summary {
      font-size: 0.875rem;
      color: var(--text-body);
      line-height: 1.6;
    }

    /* 11. FAQ 手风琴 (#faq) */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .faq-summary {
      padding: 20px 24px;
      font-weight: 700;
      font-size: 1.0625rem;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-summary::-webkit-details-marker {
      display: none;
    }
    .faq-answer {
      padding: 0 24px 20px;
      font-size: 0.9375rem;
      line-height: 1.75;
      color: var(--text-body);
      border-top: 1px solid rgba(226, 232, 240, 0.5);
      padding-top: 14px;
    }

    /* 12. 方案咨询与转化区 (#cta) */
    .cta-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      padding: 48px;
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 48px;
      align-items: center;
    }
    .cta-info h3 {
      font-size: 1.875rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .cta-info p {
      font-size: 0.9375rem;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 11px 14px;
      border-radius: 6px;
      border: 1px solid #CBD5E1;
      font-size: 0.9375rem;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(15, 43, 92, 0.1);
    }
    .btn-submit {
      width: 100%;
      background: var(--primary);
      color: #fff;
      padding: 13px;
      border: none;
      border-radius: 6px;
      font-size: 1rem;
      font-weight: 700;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-submit:hover {
      background: var(--accent-orange);
    }

    /* 页脚 (Footer) */
    .site-footer {
      background: #0B132B;
      color: #94A3B8;
      padding: 60px 0 24px;
      font-size: 0.875rem;
      border-top: 1px solid rgba(255,255,255,0.08);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-brand {
      color: #fff;
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 14px;
    }
    .footer-heading {
      color: #F8FAFC;
      font-size: 0.9375rem;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: #fff;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.8125rem;
    }

    /* 移动端汉堡切换 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--primary);
      cursor: pointer;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .hero-visual { display: none; }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .products-grid { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: 1fr; }
      .news-grid { grid-template-columns: 1fr; }
      .overview-grid { grid-template-columns: 1fr; }
      .story-card { grid-template-columns: 1fr; }
      .story-body { padding: 24px; }
      .cta-card { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .top-bar { display: none; }
      .menu-toggle { display: block; }
      .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-menu.show { display: flex; }
      .btn-header { display: none; }
      .timeline::after { left: 20px; }
      .timeline-item { width: 100%; padding-left: 50px; padding-right: 0; text-align: left !important; }
      .timeline-item.right { left: 0; }
      .timeline-item::after { left: 12px !important; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-title { font-size: 2rem; }
      .section-title { font-size: 1.5rem; }
    }