/* roulang page: index */
:root {
      --primary-color: #121316;
      --accent-green: #10B981;
      --accent-purple: #7C3AED;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #475569;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      line-height: 1.75;
      letter-spacing: -0.01em;
    }
    h1, h2, h3, h4 {
      letter-spacing: -0.02em;
    }
    .custom-scroll-mt {
      scroll-margin-top: 5.5rem;
    }
    .card-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      transition: all 0.25s ease-in-out;
    }
    .card-shadow:hover {
      box-shadow: 0 12px 30px -4px rgba(15, 23, 42, 0.12);
      transform: translateY(-3px);
    }
    details summary::-webkit-details-marker {
      display: none;
    }