/* roulang page: index */
:root {
      --primary: #0F52BA;
      --primary-hover: #0B3E8A;
      --mint: #00A887;
      --mint-hover: #00876C;
      --canvas: #F8FAFC;
      --card-bg: #FFFFFF;
      --dark-feature: #0A192F;
      --slate-title: #0F172A;
      --slate-text: #334155;
      --slate-muted: #64748B;
      --border-line: #E2E8F0;
      --shadow-default: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 20px 25px -5px rgba(15, 82, 186, 0.1), 0 8px 10px -6px rgba(15, 82, 186, 0.08);
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--canvas);
      color: var(--slate-text);
      overflow-x: hidden;
    }
    .font-mono-num {
      font-family: 'JetBrains Mono', monospace;
    }
    .card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }