body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.container{text-align:center;display:flex;flex-direction:column;justify-content:center;align-items:center;min-height:100vh;padding:20px;background:#f8f8f8}@media (max-width:600px){.container{padding:8px}.board{grid-template-columns:repeat(3,60px);grid-gap:6px}.cell{width:60px;height:60px;font-size:1.5rem}.reset{padding:8px 14px;font-size:.95rem}h1{font-size:1.5rem}.status{font-size:1rem}}.board{display:grid;grid-template-columns:repeat(3,80px);grid-gap:10px;justify-content:center;margin:20px 0}.cell{width:80px;height:80px;font-size:2rem;border:2px solid #333;background:#fff;border-radius:8px}.cell,.reset{cursor:pointer}.reset{margin-top:20px;padding:10px 20px;font-size:1rem}.status{font-size:1.2rem;font-weight:700}