* {
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  background: #1a1a2e;
  overflow: hidden;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  /* dvh tracks the real visible height on mobile as browser chrome
     collapses; browsers without dvh keep the 100% height above */
  height: 100dvh;
}

#game {
  width: min(100vw, calc(100vh * 16 / 9));
  /* flex items refuse to shrink below their content size by default; without
     this a narrow window clips the canvas edges instead of scaling it down */
  min-width: 0;
  min-height: 0;
  aspect-ratio: 16 / 9;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.6);
  /* mobile: the canvas owns all gestures — no scrolling, zooming, or
     long-press selection while playing */
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}