.app{max-width:640px;margin:0 auto;padding:2rem;text-align:center}.card{padding:2rem}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;color:#fff;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}.hint{color:#888}:root{font-family:system-ui,-apple-system,sans-serif;line-height:1.5;font-weight:400;color:#213547;background-color:#fff;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media(prefers-color-scheme:dark){:root{color:#ffffffde;background-color:#242424}}body{margin:0;min-height:100vh}