.sd-grid{border:3px solid var(--text);border-radius:12px;grid-template-columns:repeat(4,1fr);max-width:340px;margin:8px auto;display:grid;overflow:hidden}.sd-cell{aspect-ratio:1;border:1px solid var(--card-border);background:var(--surface);min-height:56px;color:var(--accent);cursor:pointer;font-size:2rem;font-weight:600}.sd-cell:nth-child(4n+2){border-right:3px solid var(--text)}.sd-cell:nth-child(n+5):nth-child(-n+8){border-bottom:3px solid var(--text)}.sd-cell.is-given,.sd-cell.is-hint{color:var(--text);font-weight:800}.sd-cell.is-hint{font-style:italic}.sd-cell.is-selected{background:color-mix(in srgb, var(--accent) 22%, var(--surface))}.sd-cell.is-bad{color:var(--error);-webkit-text-decoration:underline wavy;text-decoration:underline wavy}.sd-pad{grid-template-columns:repeat(5,1fr);gap:8px;max-width:340px;margin:12px auto 0;display:grid}.sd-pad button{border:1px solid var(--card-border);background:var(--surface);cursor:pointer;border-radius:12px;min-height:56px;font-size:1.6rem;font-weight:700}