/* roulang page: index */
:root {
      --primary: #0A4D9C;
      --primary-dark: #07366E;
      --primary-light: #EBF2FA;
      --accent: #00A86B;
      --accent-hover: #008f5a;
      --dark-surface: #0E1726;
      --dark-card: #1E293B;
      --bg-light: #F4F7FA;
      --bg-white: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #475569;
      --text-subtle: #94A3B8;
      --border-color: #E2E8F0;
      --shadow-sm: 0 4px 20px rgba(10, 77, 156, 0.06);
      --shadow-hover: 0 14px 32px rgba(10, 77, 156, 0.12);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 14px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-white);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover, a:focus {
      color: var(--accent);
    }

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

    /* 顶部服务信息栏 */
    .topbar-bar {
      background-color: #0B132B;
      color: #CBD5E1;
      font-size: 0.8125rem;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .topbar-bar a {
      color: #CBD5E1;
    }
    .topbar-bar a:hover {
      color: var(--accent);
    }
    .topbar-links {
      display: flex;
      gap: 1.5rem;
      justify-content: flex-end;
      align-items: center;
      margin: 0;
      list-style: none;
    }

    /* 主导航 */
    .site-header {
      background: var(--bg-white);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 1000;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--primary);
    }
    .brand-logo-badge {
      background: var(--primary);
      color: #fff;
      font-size: 0.75rem;
      padding: 2px 7px;
      border-radius: 4px;
      font-weight: 600;
      letter-spacing: 0.5px;
    }

    .main-nav-list {
      display: flex;
      list-style: none;
      margin: 0;
      padding: 0;
      align-items: center;
      gap: 0.5rem;
    }
    .main-nav-item {
      position: relative;
    }
    .main-nav-link {
      display: block;
      padding: 10px 14px;
      font-weight: 500;
      color: var(--text-main);
      font-size: 0.95rem;
      border-radius: var(--radius-sm);
    }
    .main-nav-link:hover, .main-nav-item:hover > .main-nav-link {
      color: var(--primary);
      background-color: var(--primary-light);
    }

    /* 下拉面板 */
    .nav-dropdown {
      position: absolute;
      top: 100%;
      left: 0;
      width: 260px;
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
      border-radius: var(--radius-md);
      padding: 10px;
      opacity: 0;
      visibility: hidden;
      transform: translateY(10px);
      transition: var(--transition);
      z-index: 99;
    }
    .main-nav-item:hover .nav-dropdown {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }
    .dropdown-item-link {
      display: block;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      font-size: 0.875rem;
      color: var(--text-main);
    }
    .dropdown-item-link:hover {
      background-color: var(--primary-light);
      color: var(--primary);
    }
    .dropdown-item-desc {
      font-size: 0.75rem;
      color: var(--text-subtle);
      display: block;
      margin-top: 2px;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 11px 24px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      cursor: pointer;
      border: 1.5px solid transparent;
      line-height: 1.2;
      text-align: center;
      min-height: 44px;
    }
    .btn-primary {
      background: linear-gradient(135deg, #0A4D9C 0%, #083c79 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(10, 77, 156, 0.25);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #083c79 0%, #062b57 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(10, 77, 156, 0.35);
    }
    .btn-accent {
      background-color: var(--accent);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(0, 168, 107, 0.25);
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: #ffffff !important;
    }

    /* 板块通用规范 */
    .section-block {
      padding: 90px 0;
      position: relative;
    }
    .section-light {
      background-color: var(--bg-light);
    }
    .section-white {
      background-color: var(--bg-white);
    }
    .section-dark {
      background-color: var(--dark-surface);
      color: #E2E8F0;
    }

    .section-header {
      margin-bottom: 50px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 12px;
      border-radius: 30px;
      margin-bottom: 12px;
    }
    .section-dark .section-tag {
      background: rgba(0, 168, 107, 0.15);
      color: #34D399;
    }
    .section-title {
      font-size: 2.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-dark .section-title {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto;
      line-height: 1.8;
    }
    .section-dark .section-desc {
      color: #94A3B8;
    }

    /* 通用卡片规范 */
    .app-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      padding: 28px;
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .app-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #CBD5E1;
    }

    /* 1. HERO 旗舰展示区 */
    .hero-section {
      background: linear-gradient(180deg, #F0F5FA 0%, #FFFFFF 100%);
      padding: 60px 0 90px;
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }
    .hero-banner-wrap {
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-lg);
      padding: 50px 40px;
      box-shadow: 0 16px 40px rgba(10, 77, 156, 0.1);
      position: relative;
      border: 1px solid rgba(255, 255, 255, 0.6);
      background-blend-mode: overlay;
      background-color: rgba(255, 255, 255, 0.94);
    }
    .hero-category-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 30px;
      padding: 10px 16px;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(8px);
      border-radius: 40px;
      border: 1px solid var(--border-color);
      width: fit-content;
    }
    .hero-category-tag {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 6px 14px;
      border-radius: 20px;
      transition: var(--transition);
    }
    .hero-category-tag:hover, .hero-category-tag.active {
      background: var(--primary);
      color: #fff;
    }
    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--primary-dark);
      line-height: 1.25;
      margin-bottom: 20px;
    }
    .hero-lead {
      font-size: 1.125rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 32px;
      max-width: 680px;
    }
    .hero-cta-group {
      display: flex;
      gap: 16px;
      align-items: center;
      margin-bottom: 32px;
    }
    .hero-metrics-pill {
      display: inline-flex;
      align-items: center;
      gap: 24px;
      padding: 12px 24px;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }
    .metric-item-num {
      font-weight: 800;
      font-size: 1.3rem;
      color: var(--primary);
      line-height: 1.1;
    }
    .metric-item-label {
      font-size: 0.78rem;
      color: var(--text-subtle);
    }

    /* 2. OVERVIEW 概览架构 */
    .overview-spec-box {
      background: var(--bg-white);
      border-left: 4px solid var(--primary);
      padding: 16px 20px;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      box-shadow: var(--shadow-sm);
      margin-bottom: 16px;
    }
    .overview-spec-box h5 {
      margin: 0 0 6px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--primary);
    }
    .overview-spec-box p {
      margin: 0;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 3. FEATURES 核心功能 */
    .feature-icon-circle {
      width: 54px;
      height: 54px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.3rem;
      margin-bottom: 20px;
    }

    /* 4. PRODUCTS 矩阵 */
    .pricing-tier {
      position: relative;
      border: 2px solid transparent;
    }
    .pricing-tier.featured {
      border-color: var(--primary);
    }
    .tier-badge {
      position: absolute;
      top: -14px;
      right: 20px;
      background: var(--accent);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
    }
    .product-spec-list {
      list-style: none;
      margin: 20px 0;
      padding: 0;
      font-size: 0.9rem;
    }
    .product-spec-list li {
      padding: 8px 0;
      border-bottom: 1px dashed var(--border-color);
      color: var(--text-muted);
    }
    .product-spec-list li strong {
      color: var(--text-main);
    }

    /* 5. TECHNOLOGY 深色对比 */
    .tech-canvas-preview {
      background: var(--dark-card);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    }
    .code-chip {
      display: inline-block;
      background: rgba(255, 255, 255, 0.08);
      color: #38BDF8;
      font-family: monospace;
      font-size: 0.85rem;
      padding: 2px 8px;
      border-radius: 4px;
      margin-bottom: 8px;
    }

    /* 6. SOLUTIONS 解决方案 */
    .quote-bubble {
      background: var(--primary-light);
      border-left: 3px solid var(--accent);
      padding: 12px 16px;
      border-radius: 4px;
      font-size: 0.875rem;
      font-style: italic;
      color: var(--primary-dark);
      margin-top: 16px;
    }

    /* 7. METRICS 数据看板 */
    .metric-big-num {
      font-size: 3.2rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
      font-feature-settings: "tnum";
    }
    .metric-big-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    /* 8. TESTIMONIALS 口碑评价 */
    .star-rating {
      color: #F59E0B;
      font-size: 1rem;
      margin-bottom: 12px;
      letter-spacing: 2px;
    }
    .user-profile {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: auto;
      padding-top: 20px;
      border-top: 1px solid var(--border-color);
    }
    .user-avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #CBD5E1;
      color: #1E293B;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.9rem;
    }

    /* 9. NEWS 资讯文章 */
    .news-card-img-wrap {
      border-radius: var(--radius-sm);
      overflow: hidden;
      margin-bottom: 16px;
      height: 180px;
    }
    .news-card-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .app-card:hover .news-card-img-wrap img {
      transform: scale(1.05);
    }
    .news-date {
      font-size: 0.78rem;
      color: var(--text-subtle);
      margin-bottom: 8px;
    }

    /* 10. GUARANTEE 服务保障 */
    .guarantee-card {
      text-align: center;
      padding: 30px 20px;
    }
    .guarantee-icon {
      font-size: 2.2rem;
      margin-bottom: 14px;
      color: var(--accent);
    }

    /* 11. FAQ 手风琴 (使用 Foundation Accordion 并重塑) */
    .accordion {
      background: transparent;
      border: none;
    }
    .accordion-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color) !important;
      border-radius: var(--radius-md) !important;
      margin-bottom: 14px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .accordion-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      padding: 18px 24px;
      border: none !important;
      transition: var(--transition);
    }
    .accordion-title:hover {
      background-color: var(--primary-light);
      color: var(--primary);
    }
    .is-active > .accordion-title {
      background-color: var(--primary-light);
      color: var(--primary);
    }
    .accordion-content {
      padding: 20px 24px;
      border: none !important;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.8;
    }

    /* 12. CONTACT 咨询收口表单 */
    .contact-form-wrap {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: 0 10px 30px rgba(10, 77, 156, 0.08);
      border: 1px solid var(--border-color);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
      display: block;
    }
    .form-control {
      width: 100%;
      height: 46px;
      border: 1.5px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 8px 14px;
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
      background: #FAFCFE;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(10, 77, 156, 0.15);
      background: #FFFFFF;
    }
    textarea.form-control {
      height: 110px;
      resize: vertical;
    }

    /* 页脚 Footer */
    .site-footer {
      background: #0B132B;
      color: #94A3B8;
      padding: 70px 0 30px;
      font-size: 0.9rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 16px;
    }
    .footer-col-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: #F8FAFC;
      margin-bottom: 18px;
      letter-spacing: 0.5px;
    }
    .footer-links-list {
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .footer-links-list li {
      margin-bottom: 10px;
    }
    .footer-links-list a {
      color: #94A3B8;
    }
    .footer-links-list a:hover {
      color: #FFFFFF;
    }
    .footer-bottom-bar {
      margin-top: 50px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.8125rem;
      text-align: center;
      color: #64748B;
    }

    /* 响应式断点控制 */
    @media (max-width: 1024px) {
      .hero-title {
        font-size: 2.25rem;
      }
      .metric-big-num {
        font-size: 2.5rem;
      }
    }

    @media (max-width: 768px) {
      .topbar-bar {
        display: none;
      }
      .nav-container {
        height: 64px;
      }
      .main-nav-list {
        display: none; /* 移动端精简处理，保留主要交互 */
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .section-block {
        padding: 55px 0;
      }
      .section-title {
        font-size: 1.65rem;
      }
      .contact-form-wrap {
        padding: 24px 18px;
      }
      .hero-banner-wrap {
        padding: 30px 18px;
      }
      .hero-cta-group {
        flex-direction: column;
        align-items: stretch;
      }
      .btn {
        width: 100%;
      }
    }