body{font-family:system-ui,sans-serif;text-align:center;margin:0;padding:2rem;background:#111;color:#eee}
h1{margin:.2em 0;font-size:2rem}
#board{border:2px solid #444;image-rendering:pixelated}
#revealBtn{margin-top:1rem;font-size:1.25rem;padding:.5rem 1.25rem;border:0;border-radius:6px;cursor:pointer}
#revealBtn:disabled{opacity:.5;cursor:not-allowed}
.hint{font-size:.8rem;color:#888}