/* roulang page: index */
:root {
      --bg-dark: #0C0F17;
      --bg-surface: #141923;
      --bg-card: #1A212E;
      --border-color: rgba(255, 255, 255, 0.08);
      --accent-cyan: #00D2B4;
      --accent-silver: #94A3B8;
      --accent-amber: #F59E0B;
    }
    body {
      background-color: var(--bg-dark);
      color: #E2E8F0;
      line-height: 1.75;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .cockpit-glow {
      box-shadow: 0 0 35px -5px rgba(0, 210, 180, 0.15);
    }
    .cockpit-glow:hover {
      box-shadow: 0 0 45px 0px rgba(0, 210, 180, 0.3);
    }
    .glass-card {
      background: rgba(26, 33, 46, 0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .glass-nav {
      background: rgba(12, 15, 23, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
    }
    /* Smooth Accordion */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .faq-active .faq-content {
      max-height: 280px;
    }
    .faq-active .faq-icon {
      transform: rotate(180deg);
    }