.board-wrap{display:flex;flex-direction:column;align-items:center;gap:var(--space-3)}.check{display:flex;align-items:center;gap:10px;min-height:44px;cursor:pointer}.check input{width:22px;height:22px;margin:0;accent-color:var(--color-accent)}.sudoku{display:grid;grid-template-columns:repeat(9,1fr);width:100%;max-width:clamp(300px,calc(100vh - 340px),480px);border:3px solid var(--board-frame);border-radius:var(--radius-sm);background:var(--color-surface);user-select:none;-webkit-user-select:none}.cell{aspect-ratio:1;border:0;border-right:1px solid var(--color-border);border-bottom:1px solid var(--color-border);padding:0;background:var(--color-surface);color:var(--color-accent-strong);font-family:var(--font-heading);font-size:clamp(1.1rem,4.6vw,1.6rem);font-weight:500;display:flex;align-items:center;justify-content:center;position:relative;touch-action:manipulation}.cell:nth-child(9n){border-right:0}.cell:nth-child(n+73){border-bottom:0}.cell.br{border-right:3px solid var(--board-frame)}.cell.bb{border-bottom:3px solid var(--board-frame)}.cell.given{color:var(--color-text);font-weight:700}.cell.peer{background:var(--color-surface-2)}.cell.same{background:var(--color-accent-soft)}.cell.selected{background:var(--color-accent-soft);outline:3px solid var(--color-accent);outline-offset:-3px;z-index:1}.cell.error{background:var(--board-square-dark);color:var(--board-frame-text)}.cell.last:after{content:"";position:absolute;left:15%;right:15%;bottom:3px;height:3px;border-radius:2px;background:var(--color-accent)}.cell:focus-visible{outline:3px solid var(--color-focus);outline-offset:-3px;z-index:1}.sudoku--done .cell{color:var(--color-text)}.marks{display:grid;grid-template-columns:repeat(3,1fr);width:100%;height:100%;font-family:var(--font-body);font-size:clamp(.45rem,1.9vw,.62rem);font-weight:600;line-height:1;color:var(--color-text-muted)}.marks i{font-style:normal;display:flex;align-items:center;justify-content:center}.keypad{display:grid;grid-template-columns:repeat(10,1fr);gap:var(--space-1);width:100%;max-width:480px}.key{min-height:48px;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);font-family:var(--font-heading);font-size:1.3rem;font-weight:500;padding:0;touch-action:manipulation}.key:hover{border-color:var(--color-accent);color:var(--color-accent)}.key--done{color:var(--color-text-muted);opacity:.45}.key--erase,.key--pencil{font-family:var(--font-body);font-size:.95rem;font-weight:600}.key--pencil{grid-column:1 / -1}.key--on{background:var(--color-accent);color:var(--color-accent-contrast);border-color:var(--color-accent)}.chip strong{font-weight:600;font-variant-numeric:tabular-nums}@media (max-width: 480px){.keypad{grid-template-columns:repeat(5,1fr)}.sudoku{border-width:2px}.cell.br{border-right-width:2px}.cell.bb{border-bottom-width:2px}}