:root{--kuro-edge:#64748b}:root[data-theme=dark]{--kuro-edge:#94a3b8}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--kuro-edge:#94a3b8}}
#board{display:grid;grid-template-columns:repeat(4,minmax(44px,1fr));gap:4px;width:100%;aspect-ratio:1;}
.kuro-tile{min-width:44px;min-height:44px;width:100%;height:100%;font-size:1.8rem;line-height:1;padding:0;touch-action:manipulation;}
.kuro-tile.black{background:var(--text);color:var(--surface);}
.kuro-tile.white,.kuro-tile.fixed{background:var(--surface);color:var(--text);}
.kuro-tile.fixed{font-weight:800;border:2px solid var(--kuro-edge);}
.kuro-tile.unknown{color:var(--muted);}
.kuro-tile.selected{box-shadow:inset 0 0 0 3px #3b82f6;}
.kuro-tile.error{outline:3px solid var(--error);outline-offset:-4px;}
.kuro-tile:disabled{opacity:1;}
.play-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px;}
.play-actions button{min-height:44px;}
#save-notice:empty{display:none;}