#game-board {
  display: block;
  margin: 0 auto;
  background-color: #2d3748;
  border-radius: var(--border-radius);
  box-shadow: inset 0 0 20px rgba(0,0,0,0.5);
  max-width: 100%;
  touch-action: none;
  user-select: none;
}

.touch-controls { max-width: 240px; margin-inline: auto; }
.touch-control-btn { flex: 1 1 44%; min-height: 52px; }