/* roulang page: index */
:root {
      --primary: #1d4ed8;
      --primary-hover: #1e40af;
      --accent: #0ea5e9;
      --bg-light: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #ffffff;
      line-height: 1.6;
    }
    .custom-scroll::-webkit-scrollbar {
      height: 6px;
      width: 6px;
    }
    .custom-scroll::-webkit-scrollbar-thumb {
      background: #cbd5e1;
      border-radius: 4px;
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(255, 255, 255, 0.94) 0%, rgba(248, 250, 252, 0.88) 100%);
    }
    .dark-overlay {
      background: linear-gradient(180deg, rgba(11, 17, 32, 0.96) 0%, rgba(15, 23, 42, 0.92) 100%);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-item.active .accordion-content {
      max-height: 200px;
    }
    .accordion-item.active .faq-icon {
      transform: rotate(45deg);
    }