:root{color-scheme:light;font-family:Arial,Helvetica,sans-serif;line-height:1.5}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100vh;background:#e8f5e9;color:#222}.shell{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem}.box{background:#fff;padding:30px 40px;border-radius:10px;box-shadow:0 2px 10px #0000001a;text-align:center;min-width:300px}h1{margin:0 0 8px;font-size:1.6rem}.subtitle{margin:0 0 12px;color:#555;font-size:1rem}input[type=number]{padding:10px;font-size:16px;width:150px;margin:10px 0;border:1px solid #ccc;border-radius:5px;text-align:center}.buttons{display:flex;gap:10px;justify-content:center;margin:10px 0}button{padding:10px 20px;font-size:16px;background:#4caf50;color:#fff;border:none;border-radius:5px;cursor:pointer}button:hover{background:#43a047}button.secondary{background:#78909c}button.secondary:hover{background:#607d8b}.message{font-size:18px;margin:15px 0 5px;min-height:1.5em;color:#333}.tries{margin:5px 0 0;color:#555}