/* roulang page: index */
:root {
      --primary: #0F766E;
      --primary-light: #14B8A6;
      --secondary: #2563EB;
      --bg-base: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-light: #64748B;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Source Han Sans CN", sans-serif;
    }
    body {
      background-color: var(--bg-base);
      color: var(--text-main);
      overflow-x: hidden;
      line-height: 1.75;
    }
    h1, h2, h3, h4 {
      line-height: 1.3;
      letter-spacing: -0.01em;
    }
    .text-balance {
      text-wrap: balance;
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      padding: 0.25rem 0.75rem;
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.05em;
    }
    .card-shadow {
      box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .card-shadow:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px -8px rgba(15, 23, 42, 0.12);
    }