/* roulang page: index */
:root {
      --color-primary: #0EA5E9;
      --color-accent: #10B981;
      --color-dark: #0F172A;
      --color-slate: #334155;
      --color-bg: #F8FAFC;
      --color-border: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    body {
      background-color: var(--color-bg);
      color: var(--color-slate);
      line-height: 1.75;
      overflow-x: hidden;
    }
    .num-tabular {
      font-variant-numeric: tabular-nums;
    }
    .card-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-shadow:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px -4px rgba(15, 23, 42, 0.12);
    }
    .hero-pattern {
      background-image: radial-gradient(rgba(14, 165, 233, 0.15) 1px, transparent 1px);
      background-size: 24px 24px;
    }
    details summary::-webkit-details-marker {
      display: none;
    }