/* roulang page: index */
:root {
      --primary-navy: #0F172A;
      --primary-deep: #1E3A8A;
      --accent-blue: #0284C7;
      --accent-emerald: #059669;
      --bg-light: #F8FAFC;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      background-color: #ffffff;
      color: var(--text-main);
      overflow-x: hidden;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
    }
    .hero-glow-overlay {
      background: linear-gradient(135deg, rgba(9, 13, 22, 0.94) 0%, rgba(15, 23, 42, 0.88) 55%, rgba(30, 58, 138, 0.78) 100%);
    }
    .custom-scroll::-webkit-scrollbar {
      height: 6px;
    }
    .custom-scroll::-webkit-scrollbar-thumb {
      background-color: #cbd5e1;
      border-radius: 9999px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }