/* roulang page: index */
:root {
      --bg-clean: #F8FAFC;
      --bg-silicon: #F1F5F9;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --c-carbide: #0F172A;
      --c-blue: #0284C7;
      --c-amber: #D97706;
      --c-green: #10B981;
      --border-color: #E2E8F0;
    }
    body {
      background-color: var(--bg-clean);
      color: var(--text-main);
      font-family: 'PingFang SC', 'HarmonyOS Sans SC', 'Microsoft YaHei', sans-serif;
      line-height: 1.8;
      letter-spacing: 0.015em;
      overflow-x: hidden;
    }
    .technical-code {
      font-family: 'JetBrains Mono', Consolas, monospace;
    }
    .fab-grid-bg {
      background-size: 32px 32px;
      background-image: 
        linear-gradient(to right, rgba(2, 132, 199, 0.05) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(2, 132, 199, 0.05) 1px, transparent 1px);
    }
    .fab-card-hover {
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .fab-card-hover:hover {
      border-color: var(--c-blue);
      transform: translateY(-2px);
      box-shadow: 0 10px 24px -4px rgba(15, 23, 42, 0.08);
    }
    .accordion-content {
      transition: max-height 0.3s ease-out, opacity 0.2s ease;
    }
    /* 滚动条精密工业样式 */
    ::-webkit-scrollbar {
      width: 6px;
      height: 6px;
    }
    ::-webkit-scrollbar-track {
      background: #F1F5F9;
    }
    ::-webkit-scrollbar-thumb {
      background: #94A3B8;
      border-radius: 3px;
    }
    ::-webkit-scrollbar-thumb:hover {
      background: #64748B;
    }