/* roulang page: index */
:root {
      --bg-main: #060B19;
      --bg-card: rgba(15, 28, 54, 0.7);
      --border-glow: rgba(0, 210, 255, 0.2);
      --accent-cyan: #00D2FF;
      --accent-green: #00F5A0;
      --accent-blue: #0072FF;
      --text-main: #FFFFFF;
      --text-muted: #94A3B8;
    }
    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .glass-panel {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
    }
    .glass-card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-card-hover:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 210, 255, 0.5);
      box-shadow: 0 10px 30px -10px rgba(0, 210, 255, 0.3);
    }
    .glow-btn {
      background: linear-gradient(135deg, #00D2FF, #0072FF);
      box-shadow: 0 4px 20px rgba(0, 210, 255, 0.35);
      transition: all 0.3s ease;
    }
    .glow-btn:hover {
      box-shadow: 0 6px 28px rgba(0, 210, 255, 0.55);
      transform: translateY(-1px);
    }
    .text-glow {
      text-shadow: 0 0 12px rgba(0, 210, 255, 0.5);
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }
    .faq-active .faq-content {
      max-height: 200px;
    }
    .faq-active .faq-icon {
      transform: rotate(180deg);
    }
    html {
      scroll-behavior: smooth;
    }