#reversi-game{max-width:400px;margin:2rem auto;padding:1rem;background:#f8f8f8;border-radius:10px;box-shadow:0 2px 8px rgba(0,0,0,.1);text-align:center}#reversi-board{display:grid;grid-template-columns:repeat(8,40px);grid-template-rows:repeat(8,40px);gap:2px;margin:1rem auto;background:#2e7d32;border:2px solid #222;border-radius:6px}.reversi-cell{width:40px;height:40px;background:#388e3c;border-radius:4px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background .2s}.reversi-cell:hover{background:#43a047}.reversi-disc{width:32px;height:32px;border-radius:50%;box-shadow:0 1px 3px rgba(0,0,0,.2)}.reversi-black{background:#222}.reversi-white{background:#fff;border:2px solid #bbb}#reversi-info{margin-top:1rem;font-size:1.1rem}#reversi-restart{margin-top:.5rem;padding:.4rem 1.2rem;font-size:1rem;background:#1976d2;color:#fff;border:none;border-radius:4px;cursor:pointer;transition:background .2s}#reversi-restart:hover{background:#1565c0}