/* roulang page: index */
:root {
      --bg-deep: #070B19;
      --bg-surface: #0B132B;
      --card-bg: rgba(15, 23, 42, 0.75);
      --border-glow: rgba(56, 189, 248, 0.25);
      --border-hover: rgba(0, 242, 254, 0.6);
      --cyan-light: #00F2FE;
      --blue-accent: #38BDF8;
      --gold-accent: #F59E0B;
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      background-color: var(--bg-deep);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .glass-card {
      background: var(--card-bg);
      border: 1px solid var(--border-glow);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-card:hover {
      border-color: var(--border-hover);
      box-shadow: 0 10px 30px -10px rgba(0, 242, 254, 0.2);
      transform: translateY(-2px);
    }
    .btn-glow-cyan {
      background: linear-gradient(135deg, #00F2FE 0%, #0284C7 100%);
      color: #04111D;
      font-weight: 700;
      box-shadow: 0 0 20px rgba(0, 242, 254, 0.35);
      transition: all 0.25s ease;
    }
    .btn-glow-cyan:hover {
      box-shadow: 0 0 28px rgba(0, 242, 254, 0.6);
      transform: translateY(-2px);
      color: #000;
    }
    .btn-glow-cyan:active {
      transform: scale(0.98);
    }
    .btn-outline-glow {
      border: 1px solid rgba(56, 189, 248, 0.45);
      color: #38BDF8;
      backdrop-filter: blur(8px);
      transition: all 0.25s ease;
    }
    .btn-outline-glow:hover {
      background: rgba(56, 189, 248, 0.12);
      border-color: #00F2FE;
      color: #F8FAFC;
      transform: translateY(-2px);
    }
    .text-glow {
      background: linear-gradient(180deg, #FFFFFF 20%, #38BDF8 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .faq-panel details[open] {
      border-color: rgba(0, 242, 254, 0.6);
      background: rgba(15, 23, 42, 0.85);
    }
    .faq-panel summary {
      cursor: pointer;
      list-style: none;
    }
    .faq-panel summary::-webkit-details-marker {
      display: none;
    }