*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;display:flex;justify-content:center;align-items:center}#root{width:100%;display:flex;justify-content:center;align-items:center;padding:20px}.app{width:100%;max-width:500px}.game{background:#fff;border-radius:20px;padding:40px;box-shadow:0 20px 60px #0000004d;text-align:center}h1{color:#333;margin-bottom:30px;font-size:2.5rem;font-weight:700;text-transform:uppercase;letter-spacing:2px}.game-info{margin-bottom:30px}.status{font-size:1.5rem;font-weight:600;color:#667eea;min-height:36px;display:flex;align-items:center;justify-content:center}.board{display:inline-block;margin-bottom:30px}.board-row{display:flex}.square{width:100px;height:100px;background:#f8f9fa;border:3px solid #667eea;font-size:3rem;font-weight:700;cursor:pointer;transition:all .3s ease;color:#333;display:flex;align-items:center;justify-content:center}.square:hover:not(:disabled){background:#e9ecef;transform:scale(1.05)}.square:active:not(:disabled){transform:scale(.95)}.square:disabled{cursor:not-allowed}.square.winning{background:#667eea;color:#fff;animation:pulse .6s ease-in-out}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}.board-row:first-child .square{border-top:none}.board-row:last-child .square{border-bottom:none}.square:first-child{border-left:none}.square:last-child{border-right:none}.board-row:first-child .square:first-child{border-top-left-radius:10px}.board-row:first-child .square:last-child{border-top-right-radius:10px}.board-row:last-child .square:first-child{border-bottom-left-radius:10px}.board-row:last-child .square:last-child{border-bottom-right-radius:10px}.reset-button{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:15px 40px;font-size:1.1rem;font-weight:600;border-radius:50px;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #667eea66;text-transform:uppercase;letter-spacing:1px}.reset-button:hover{transform:translateY(-2px);box-shadow:0 6px 20px #667eea99}.reset-button:active{transform:translateY(0)}@media (max-width: 600px){.game{padding:20px}h1{font-size:2rem;margin-bottom:20px}.status{font-size:1.2rem}.square{width:80px;height:80px;font-size:2.5rem}.reset-button{padding:12px 30px;font-size:1rem}}@media (max-width: 400px){h1{font-size:1.5rem}.square{width:70px;height:70px;font-size:2rem;border-width:2px}.status{font-size:1rem}}