/* roulang page: index */
:root {
      --primary: #0F2C59;
      --accent: #D35400;
      --dark: #0B192C;
      --surface: #F8F9FA;
      --text-main: #1E293B;
      --text-muted: #475569;
      --border: #E2E8F0;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      overflow-x: hidden;
      line-height: 1.7;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .custom-shadow {
      box-shadow: 0 10px 25px -5px rgba(15, 44, 89, 0.08), 0 8px 10px -6px rgba(15, 44, 89, 0.04);
    }
    .card-hover {
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 30px -6px rgba(15, 44, 89, 0.12);
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }
    .faq-active .faq-content {
      max-height: 240px;
    }
    .faq-active .faq-icon {
      transform: rotate(180deg);
    }
    .hero-progress-ring {
      transform: rotate(-90deg);
    }