* {
  box-sizing: border-box;
  user-select: none;
}

body {
  margin: 0;
  background: #06070a;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
  font-family: 'Courier New', Consolas, monospace;
}

#gameContainer {
  position: relative;
  width: 100vw;
  height: 56.25vw; /* 嚴格維持 16:9 */
  max-height: 100vh;
  max-width: 177.78vh;
  box-shadow: 0 0 45px rgba(0, 0, 0, 0.95);
  background: #000;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: none;
}