/* roulang page: index */
:root {
      --primary: #0F172A;
      --accent: #0EA5E9;
      --accent-hover: #0284C7;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
      color: #334155;
      background-color: #FFFFFF;
      overflow-x: hidden;
    }
    .card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px -4px rgba(15, 23, 42, 0.08);
    }
    .subtle-grid {
      background-size: 32px 32px;
      background-image: 
        linear-gradient(to right, rgba(226, 232, 240, 0.6) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(226, 232, 240, 0.6) 1px, transparent 1px);
    }