/* roulang page: index */
:root {
      --brand-primary: #00E599;
      --brand-secondary: #00D2D3;
      --brand-accent: #FF6B35;
      --bg-dark: #0B1120;
      --bg-card: #151F32;
      --border-glow: rgba(0, 229, 153, 0.2);
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: #070B14;
      color: #E2E8F0;
      overflow-x: hidden;
    }
    .grid-pattern {
      background-image: radial-gradient(rgba(0, 229, 153, 0.08) 1px, transparent 1px);
      background-size: 28px 28px;
    }
    .tech-border {
      border: 1px solid rgba(255, 255, 255, 0.08);
      position: relative;
    }
    .tech-border:hover {
      border-color: rgba(0, 229, 153, 0.4);
      box-shadow: 0 0 20px rgba(0, 229, 153, 0.15);
    }
    .text-glow {
      text-shadow: 0 0 12px rgba(0, 229, 153, 0.4);
    }
    .glass-nav {
      background: rgba(11, 17, 32, 0.88);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }
    .btn-pulse {
      background: linear-gradient(135deg, #00E599 0%, #00B4D8 100%);
      transition: all 0.25s ease-out;
    }
    .btn-pulse:hover {
      box-shadow: 0 0 18px rgba(0, 229, 153, 0.45);
      transform: translateY(-2px);
    }