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

html {
  height: 100dvh;
  overflow: hidden;
}

body {
  width: 100%;
  height: 100dvh;
  overflow: hidden;
  background: #000;
  display: flex;
  flex-direction: row;
  align-items: flex-end;
}

#game-container {
  position: relative;
  flex: 0 0 auto;
  /* Height drives sizing: capped at viewport height, or shorter when viewport is narrower than the game ratio.
     Width is derived from height via aspect-ratio, naturally centering between the side panels. */
  height: min(100dvh, calc(100vw * var(--canvas-h) / var(--canvas-w)));
  aspect-ratio: var(--canvas-w) / var(--canvas-h);
}

#canvas {
  display: block;
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
}

#side-left,
#side-right {
  position: relative;
  flex: 1;
  height: 100dvh;
  overflow: hidden;
}

#side-left img,
#side-right img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

#side-left::after,
#side-right::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
}

#side-left::after {
  background: linear-gradient(to left, rgba(0,0,0,0.95), rgba(0,0,0,0.5));
}

#side-right::after {
  background: linear-gradient(to right, rgba(0,0,0,0.95), rgba(0,0,0,0.5));
}