/* roulang page: index */
:root {
      --primary: #1A2C3D;
      --primary-dark: #111C27;
      --accent: #C59B27;
      --bgneutral: #F8F9FA;
      --text-main: #0F172A;
      --text-sub: #334155;
      --border-line: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-sub);
      background-color: var(--bgneutral);
      overflow-x: hidden;
      line-height: 1.75;
    }
    .custom-card {
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    }
    .custom-card:hover {
      transform: translateY(-4px);
      border-color: var(--accent);
      box-shadow: 0 14px 28px -8px rgba(26, 44, 61, 0.09);
    }
    details summary::-webkit-details-marker {
      display: none;
    }