html, body {
  margin: 0;
  padding: 0;
  background: #100d0b;
  height: 100%;
  overflow: hidden;
  font-family: 'Shippori Mincho', 'Yu Mincho', serif;
}

#game-wrap {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

#game {
  background: #181410;
  touch-action: none;
  cursor: crosshair;
  box-shadow: 0 0 80px rgba(0,0,0,0.9);
  max-width: 100vw;
  max-height: 100vh;
}

/* the fluid ink-smoke layer floats exactly over the game, untouchable */
#fluid {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  opacity: 0.85;
}