#board {grid-template-columns:repeat(5,minmax(0,1fr));border:2px solid var(--line);border-radius:5px;overflow:hidden;}
.light-cell {border-radius:0;position:relative;font-size:1.45rem;line-height:1;border-color:var(--line);}
.light-cell.wall {background:var(--text);color:var(--bg);font-weight:750;opacity:1;cursor:default;}
.light-cell.lit {background:#fff3be;color:#292111;}
:root[data-theme=dark] .light-cell.lit {background:#594b23;color:#fff5d0;}
.light-cell.bulb {font-size:1.65rem;}
.light-cell.conflict {box-shadow:inset 0 0 0 3px var(--error);color:var(--error);}
.light-cell.selected {box-shadow:inset 0 0 0 3px #2563eb;}
.light-cell.selected.conflict {outline:2px solid var(--error);outline-offset:-5px;}
.mark-controls {display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;max-width:430px;margin:0 auto 8px;}
.mark-controls button {padding:8px 2px;}
.play-actions {grid-template-columns:repeat(3,minmax(0,1fr));}
.play-actions button {min-height:44px;}
@media(prefers-color-scheme:dark) {:root:not([data-theme=light]) .light-cell.lit {background:#594b23;color:#fff5d0;}}