/* roulang page: index */
:root {
      --bg-deep: #0B0E14;
      --bg-surface: #111827;
      --text-main: #E2E8F0;
      --text-muted: #94A3B8;
      --brand-blue: #0052D9;
      --brand-orange: #F97316;
      --border-line: rgba(255, 255, 255, 0.08);
    }
    body {
      background-color: var(--bg-deep);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      overflow-x: hidden;
    }
    .custom-gradient-border {
      border: 1px solid var(--border-line);
      background: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, rgba(255,255,255,0.01) 100%);
    }
    .custom-gradient-border:hover {
      border-color: rgba(0, 82, 217, 0.4);
      box-shadow: 0 8px 30px rgba(0, 82, 217, 0.12);
    }
    .glow-tag {
      background: rgba(249, 115, 22, 0.12);
      border: 1px solid rgba(249, 115, 22, 0.35);
      color: #FB923C;
    }
    .tech-grid-bg {
      background-image: radial-gradient(rgba(0, 82, 217, 0.15) 1px, transparent 1px);
      background-size: 28px 28px;
    }
    .pulse-dot {
      box-shadow: 0 0 0 0 rgba(249, 115, 22, 0.7);
      animation: pulse-ring 2s infinite cubic-bezier(0.66, 0, 0, 1);
    }
    @keyframes pulse-ring {
      to {
        box-shadow: 0 0 0 10px rgba(249, 115, 22, 0);
      }
    }