/* roulang page: index */
:root {
      --primary: #4F46E5;
      --secondary: #06B6D4;
      --accent: #F59E0B;
      --bg-surface: #F8FAFC;
      --bg-card: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #475569;
      --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: var(--bg-surface);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .hero-mask {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 41, 59, 0.85) 60%, rgba(79, 70, 229, 0.8) 100%);
    }
    .glass-dark {
      background: rgba(15, 23, 42, 0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .custom-shadow {
      box-shadow: 0 10px 30px -5px rgba(79, 70, 229, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    }
    .transition-card {
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .transition-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 35px -8px rgba(79, 70, 229, 0.15);
    }