/* roulang page: index */
:root {
      --bg-dark: #030712;
      --card-bg: rgba(15, 23, 42, 0.75);
      --border-glow: rgba(6, 182, 212, 0.25);
    }
    body {
      background-color: var(--bg-dark);
      color: #cbd5e1;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-card:hover {
      transform: translateY(-4px);
      border-color: rgba(6, 182, 212, 0.45);
      box-shadow: 0 12px 30px -8px rgba(6, 182, 212, 0.2);
    }
    .text-glow {
      text-shadow: 0 0 18px rgba(6, 182, 212, 0.5);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-content.open {
      max-height: 400px;
    }