/* roulang page: index */
:root {
      --primary: #0D9488;
      --primary-hover: #0F766E;
      --primary-light: #F0FDFA;
      --dark-slate: #0F172A;
      --bg-titanium: #F8FAFC;
      --text-main: #0F172A;
      --text-secondary: #334155;
      --text-muted: #64748B;
      --border-line: #E2E8F0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      overflow-x: hidden;
      line-height: 1.65;
    }
    .hero-gradient-overlay {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(13, 148, 136, 0.82) 100%);
    }
    .feature-card {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(13, 148, 136, 0.1), 0 10px 10px -5px rgba(13, 148, 136, 0.04);
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    .glass-card {
      background: rgba(255, 255, 255, 0.9);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(226, 232, 240, 0.8);
    }
    .dark-glass-card {
      background: rgba(30, 41, 59, 0.7);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.1);
    }