/* roulang page: index */
:root {
      --primary: #0A2540;
      --midnight: #061325;
      --accent: #00D4B2;
      --orange: #FF5C35;
      --bg-gray: #F8FAFC;
      --text-muted: #475569;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
    }
    .custom-shadow {
      box-shadow: 0 4px 20px -2px rgba(10, 37, 64, 0.06);
    }
    .hover-card {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .hover-card:hover {
      box-shadow: 0 20px 30px -4px rgba(10, 37, 64, 0.12);
      transform: translateY(-4px);
    }
    .neon-btn {
      box-shadow: 0 4px 14px 0 rgba(0, 212, 178, 0.39);
      transition: all 0.2s ease;
    }
    .neon-btn:hover {
      box-shadow: 0 6px 20px 0 rgba(0, 212, 178, 0.55);
      transform: translateY(-1px);
    }
    details > summary {
      list-style: none;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }
    details[open] {
      border-left: 3px solid #00D4B2;
    }