#board{display:grid;grid-template-columns:repeat(4,minmax(44px,1fr));gap:0;width:100%;aspect-ratio:1;max-width:400px;margin:auto}
.nori-tile{min-width:44px;min-height:44px;width:100%;height:100%;font-size:1.8rem;line-height:1;padding:0;border:1px solid #64748b;border-radius:0;touch-action:manipulation}
.nori-tile.black{background:#0f172a;color:#fff}.nori-tile.white{background:#fff;color:#0f172a}.nori-tile.unknown{background:var(--surface);color:var(--muted)}
.nori-tile.selected{outline:1px solid #3b82f6;outline-offset:-5px}.nori-tile.error{text-decoration:underline wavy var(--error)}.nori-tile:disabled{opacity:1}
.mark-controls,.play-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}.mark-controls button,.play-actions button{min-height:44px}.mark-controls button{font-size:1.2rem}
#save-notice:empty{display:none}