/* roulang page: index */
:root {
      --primary-dark: #090D16;
      --secondary-dark: #0F172A;
      --slate-deep: #0A3641;
      --accent-mint: #00F29B;
      --accent-orange: #FF7A00;
      --card-bg: rgba(15, 23, 42, 0.78);
      --card-border: rgba(148, 163, 184, 0.16);
      --text-muted: #94A3B8;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--primary-dark);
      color: #E2E8F0;
      overflow-x: hidden;
      line-height: 1.75;
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 35%, rgba(0, 242, 155, 0.18) 0%, rgba(10, 54, 65, 0.3) 45%, rgba(9, 13, 22, 0) 75%);
    }
    .glass-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      backdrop-filter: blur(12px);
      transition: all 0.28s ease-in-out;
    }
    .glass-card:hover {
      border-color: rgba(0, 242, 155, 0.45);
      transform: translateY(-3px);
      box-shadow: 0 12px 30px -10px rgba(0, 242, 155, 0.15);
    }
    .badge-mint {
      background: rgba(0, 242, 155, 0.12);
      color: var(--accent-mint);
      border: 1px solid rgba(0, 242, 155, 0.3);
    }
    .custom-gradient-text {
      background: linear-gradient(135deg, #FFFFFF 20%, #E2E8F0 50%, var(--accent-mint) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .tab-active {
      border-color: var(--accent-mint);
      color: var(--accent-mint);
      background: rgba(0, 242, 155, 0.08);
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-open .faq-content {
      max-height: 300px;
    }
    .faq-open .faq-icon {
      transform: rotate(180deg);
    }