#board {grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;padding:6px;border:1px solid var(--line);border-radius:12px;background:var(--bg);} .cell {font-size:1.75rem;font-weight:650;border-radius:8px;min-width:44px;min-height:44px;} .cell.blank {background:var(--bg);border:1px dashed var(--line);} .cell.movable {border-color:var(--text);} .cell:disabled {opacity:1;} .cell.selected {outline:3px solid #2563eb;outline-offset:-4px;} .play-actions {grid-template-columns:repeat(3,minmax(0,1fr));}
@media(max-width:360px) {main {width:calc(100% - 16px);} .cell {font-size:1.5rem;}}