* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  font-family: monospace;
  overflow: hidden;
}

#gameCanvas {
  display: block;
  cursor: crosshair;
  image-rendering: pixelated;
  border: 1px solid #111;
  box-shadow: 0 0 40px rgba(0, 100, 255, 0.15);
}