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

html, body {
  width: 100%;
  height: 100%;
  background: #0a0812;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  font-family: monospace;
}

#game-container {
  position: relative;
  line-height: 0;
  /* Scale to ~85% of viewport, respecting the 8:5 (800×500) aspect ratio.
     136vh = 85vh × (800/500) — prevents the canvas from overflowing vertically. */
  width: min(85vw, 136vh);
}

#game-container canvas {
  display: block;
  /* Let CSS scale the canvas element; internal pixel resolution stays 800×500. */
  width: 100% !important;
  height: auto !important;
  border: 1px solid #750f0f;
  box-shadow:
    0 0 60px rgba(190, 25, 25, 0.25),
    0 0 120px rgba(104, 15, 15, 0.1);
  image-rendering: pixelated;
}