* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Courier New', monospace;
      background: linear-gradient(to bottom, #0a0a1a, #1a0a2e);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      color: #fff;
    }
    h1 {
      font-size: 2.5rem;
      color: #00ff00;
      text-shadow: 0 0 20px #00ff00;
      margin-bottom: 10px;
      animation: glow 2s ease-in-out infinite;
    }
    @keyframes glow {
      0%,
      100% {
        text-shadow: 0 0 20px #00ff00;
      }
      50% {
        text-shadow: 0 0 40px #00ff00, 0 0 60px #00ff00;
      }
    }
    .subtitle {
      color: #888;
      margin-bottom: 20px;
    }
    #gameCanvas {
      border: 4px solid #00ff00;
      border-radius: 10px;
      box-shadow: 0 0 30px rgba(0, 255, 0, 0.5);
      image-rendering: pixelated;
      background: #0a0a1a;
    }
    .controls {
      margin-top: 20px;
      text-align: center;
      color: #aaa;
    }
    .controls p {
      margin: 10px 0;
    }
    .powerup-info {
      color: #ffd700;
      text-shadow: 0 0 10px #ffd700;
    }