/* roulang page: index */
:root {
      --primary: #1d4ed8;
      --primary-hover: #1e40af;
      --secondary: #0ea5e9;
      --dark-slate: #0f172a;
      --body-bg: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --card-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
      --card-shadow-hover: 0 20px 30px -10px rgba(15, 23, 42, 0.12), 0 10px 15px -5px rgba(15, 23, 42, 0.05);
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--body-bg);
      color: var(--text-main);
    }
    .custom-shadow {
      box-shadow: var(--card-shadow);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-shadow:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-3px);
    }
    .section-py {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }
    @media (min-width: 1024px) {
      .section-py {
        padding-top: 6rem;
        padding-bottom: 6rem;
      }
    }