.app{text-align:center;border:1px solid #ccc;padding:20px;font-family:sans-serif}.board{grid-template-columns:repeat(3,80px);justify-content:center;gap:8px;margin:24px 0;display:grid}.cell{cursor:pointer;color:#333;background-color:#f9f9f9;border:1px solid #ccc;width:80px;height:80px;font-size:32px;font-weight:700}.reset{cursor:pointer;padding:8px 16px}