/* roulang page: index */
:root {
      --primary: #0284C7;
      --primary-dark: #2563EB;
      --accent: #F97316;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-sub: #64748B;
      --bg-light: #F8FAFC;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: #FFFFFF;
      color: var(--text-main);
      overflow-x: hidden;
    }
    .custom-gradient {
      background: linear-gradient(135deg, #0284C7 0%, #2563EB 100%);
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 50%, rgba(2, 132, 199, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
    }
    .card-stack {
      perspective: 1000px;
    }
    details summary::-webkit-details-marker {
      display: none;
    }