/* roulang page: index */
:root {
      --bg-dark: #0A0D14;
      --bg-card: #121722;
      --border-glow: rgba(0, 210, 211, 0.25);
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
      --primary-cyan: #00D2D3;
      --primary-emerald: #10B981;
    }
    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
      line-height: 1.7;
    }
    .tech-border {
      border: 1px solid rgba(148, 163, 184, 0.15);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .tech-border:hover {
      border-color: rgba(0, 210, 211, 0.5);
      box-shadow: 0 10px 30px -10px rgba(0, 210, 211, 0.2);
      transform: translateY(-2px);
    }
    .gold-border {
      border: 1px solid rgba(245, 158, 11, 0.35);
      box-shadow: 0 0 25px -5px rgba(245, 158, 11, 0.15);
    }
    .glass-nav {
      background: rgba(10, 13, 20, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .subtle-grid {
      background-size: 40px 40px;
      background-image: 
        linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    }