/* roulang page: index */
:root {
      --primary: #0F2537;
      --accent: #0284C7;
      --success: #0D9488;
      --surface: #F8FAFC;
      --dark: #0B1926;
      --text: #0F172A;
      --muted: #64748B;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--surface);
      color: var(--text);
      line-height: 1.7;
    }
    .text-justify-cn { text-align: justify; text-justify: inter-ideograph; }
    .card-shadow {
      box-shadow: 0 4px 12px -2px rgba(15, 37, 55, 0.06), 0 2px 6px -1px rgba(15, 37, 55, 0.04);
      transition: all 0.25s ease;
    }
    .card-shadow:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 24px -4px rgba(15, 37, 55, 0.12), 0 6px 12px -2px rgba(15, 37, 55, 0.06);
    }
    .code-console {
      background: #08121c;
      border: 1px solid #1e364d;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    }