/* roulang page: index */
:root {
      --electric: #1E5AFA;
      --amber: #F59E0B;
      --deep-title: #0F172A;
      --body-text: #334155;
      --muted: #64748B;
      --light-bg: #F8FAFC;
      --ice: #F1F5F9;
      --footer-bg: #1E293B;
      --success: #10B981;
      --card-radius: 12px;
      --card-shadow: 0 2px 8px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 8px 24px rgba(0,0,0,0.08);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      background-color: #FFFFFF;
      color: #334155;
      line-height: 1.6;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .nav-link {
      color: #64748B;
      font-weight: 500;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: #1E5AFA;
    }
    /* 卡片 */
    .feature-card, .scenario-card, .case-card, .pricing-card {
      background: white;
      border-radius: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      border: 1px solid #E2E8F0;
      transition: all 0.2s ease;
    }
    .feature-card:hover, .scenario-card:hover, .case-card:hover {
      box-shadow: 0 8px 24px rgba(0,0,0,0.08);
      transform: translateY(-4px);
    }
    .pricing-highlight {
      border: 2px solid #1E5AFA;
      box-shadow: 0 4px 16px rgba(30,90,250,0.08);
    }
    .scenario-card {
      border-top: 4px solid #1E5AFA;
      border-top-left-radius: 12px;
      border-top-right-radius: 12px;
    }
    /* 按钮 */
    .btn-primary {
      background-color: #1E5AFA;
      color: white;
      border-radius: 8px;
      padding: 12px 24px;
      font-weight: 600;
      display: inline-block;
      text-align: center;
      transition: background-color 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background-color: #F59E0B;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid #1E5AFA;
      color: #1E5AFA;
      border-radius: 8px;
      padding: 12px 24px;
      font-weight: 600;
      display: inline-block;
      text-align: center;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background-color: #1E5AFA;
      color: white;
    }
    .btn-amber {
      background-color: #F59E0B;
      color: white;
      border-radius: 8px;
      padding: 14px 32px;
      font-weight: 700;
      display: inline-block;
      text-align: center;
      transition: background-color 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-amber:hover {
      background-color: #D97706;
    }
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid #E2E8F0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.125rem;
      color: #0F172A;
      padding: 20px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: #334155;
      padding: 0 0 0 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-bottom: 20px;
    }
    .faq-icon {
      color: #1E5AFA;
      font-size: 1.5rem;
      font-weight: 400;
      transition: transform 0.2s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* 移动端菜单 */
    #mobile-menu {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
    }
    #mobile-menu.open {
      max-height: 500px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      .section-space {
        padding: 60px 0;
      }
      .btn-primary, .btn-outline, .btn-amber {
        width: 100%;
        display: block;
        padding: 14px 20px;
      }
    }