* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
  width: 100%;
  height: 100%;
  background: #0A0E27;
  overflow: hidden;
  font-family: -apple-system, 'Hiragino Sans', sans-serif;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
#game-container {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
canvas { display: block; max-width: 100%; max-height: 100vh; }