/* roulang page: index */
:root {
      --brand-primary: #0284C7;
      --brand-secondary: #2563EB;
      --text-dark: #0F172A;
      --text-body: #334155;
      --bg-page: #F8FAFC;
    }
    body {
      background-color: var(--bg-page);
      color: var(--text-body);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(3, 105, 161, 0.82) 100%);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }
    .accordion-item.active .accordion-content {
      max-height: 200px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }