:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}.card{padding:2em}.grid-container{display:grid;grid-template-columns:repeat(9,30px);gap:2px;background-color:#333;padding:5px;border-radius:4px}.grid-cell{width:30px;height:30px;background-color:#555;cursor:pointer;border-radius:2px}.grid-cell.filled{background-color:#646cff}.grid-cell.highlight{background-color:#adf}.grid-cell.subgrid-odd{background-color:#444}.shape-slot{width:150px;height:150px;border:2px dashed #666;display:flex;align-items:center;justify-content:center;margin:10px;cursor:pointer}.shape-grid{display:grid;gap:2px}