:root{font-family:system-ui,-apple-system,sans-serif;line-height:1.5;font-weight:400;color:#000;background-color:#fff;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;min-width:320px;min-height:100vh}*{box-sizing:border-box}.app{max-width:400px;margin:0 auto;padding:2rem;text-align:center;font-family:monospace;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh}h1{margin:0 0 2rem;font-size:2rem}.grid{display:flex;flex-direction:column;gap:.5rem;margin-bottom:1rem}.row{display:flex;gap:.5rem;justify-content:center}.cell{width:3rem;height:3rem;border:2px solid black;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:700;background-color:#fff}.cell.green{background-color:#6aaa64;color:#fff}.cell.yellow{background-color:#c9b458;color:#fff}.cell.gray{background-color:#787c7e;color:#fff}.counter{margin:1rem 0;font-size:1.2rem}.message{margin:1rem 0;font-size:1.5rem;font-weight:700}input{padding:.5rem;font-size:1rem;font-family:monospace;text-transform:uppercase;border:2px solid black;margin:1rem 0;text-align:center;width:200px}button{padding:.5rem 1rem;font-size:1rem;font-family:monospace;background-color:#fff;border:2px solid black;cursor:pointer}button:hover{background-color:#f0f0f0}