/* roulang page: index */
:root {
      --primary: #0F172A;
      --secondary: #0B1120;
      --accent: #059669;
      --accent-hover: #047857;
      --highlight: #0EA5E9;
      --surface: #F8FAFC;
      --text: #334155;
      --text-muted: #64748B;
      --border: #E2E8F0;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.8;
      color: var(--text);
      background-color: var(--surface);
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      letter-spacing: -0.02em;
      color: var(--primary);
      font-weight: 700;
    }
    .btn-primary {
      background-color: var(--accent);
      color: #ffffff;
      transition: all 200ms ease-in-out;
      box-shadow: 0 4px 14px 0 rgba(5, 150, 105, 0.39);
    }
    .btn-primary:hover {
      background-color: var(--accent-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 20px 0 rgba(5, 150, 105, 0.45);
    }
    .btn-primary:active {
      transform: translateY(1px);
    }
    .card-modern {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 1rem;
      transition: all 250ms ease-out;
    }
    .card-modern:hover {
      border-color: #CBD5E1;
      transform: translateY(-4px);
      box-shadow: 0 12px 28px -6px rgba(15, 23, 42, 0.08);
    }
    .tabular-numbers {
      font-variant-numeric: tabular-nums;
    }