/* roulang page: index */
:root {
      --primary: #10b981;
      --primary-dark: #059669;
      --accent: #f59e0b;
      --bg-dark: #090d16;
      --bg-surface: #0f172a;
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      background-color: #f8fafc;
      color: #1e293b;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
    }
    .custom-scroll::-webkit-scrollbar {
      height: 6px;
      width: 6px;
    }
    .custom-scroll::-webkit-scrollbar-thumb {
      background: #cbd5e1;
      border-radius: 9999px;
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(16, 185, 129, 0.18) 0%, rgba(9, 13, 22, 0) 70%);
    }
    .glass-card {
      background: rgba(30, 41, 59, 0.7);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .border-glow:hover {
      border-color: #10b981;
      box-shadow: 0 0 20px rgba(16, 185, 129, 0.2);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .accordion-content.open {
      max-height: 500px;
    }