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210px));aspect-ratio:1 / 1;border:3px solid var(--text-color, #111827);border-radius:.5rem;overflow:hidden;background:var(--bg-surface, #ffffff);box-shadow:0 4px 10px #00000014;outline:none;user-select:none;-webkit-user-select:none}.board-watermark[data-astro-cid-64wbnxzx]{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:clamp(1.8rem,6vw,3rem);font-weight:900;color:var(--primary-color, #6366f1);opacity:.18;pointer-events:none;user-select:none;white-space:nowrap;z-index:10;letter-spacing:.06em}.sudoku-cell[data-astro-cid-64wbnxzx]{position:relative;z-index:1;display:flex;align-items:center;justify-content:center;border:1px solid var(--border-color, #cbd5e1);font-size:clamp(1.1rem,4.2vw,1.7rem);font-weight:600;color:var(--primary-color, #4f46e5);cursor:pointer;transition:background-color .1s;background:transparent}.border-col-2[data-astro-cid-64wbnxzx],.border-col-5[data-astro-cid-64wbnxzx]{border-right:2px solid var(--text-color, #111827)!important}.border-row-2[data-astro-cid-64wbnxzx],.border-row-5[data-astro-cid-64wbnxzx]{border-bottom:2px solid var(--text-color, #111827)!important}.sudoku-cell[data-astro-cid-64wbnxzx].cell-given{color:var(--text-color, #0f172a);font-weight:800}.sudoku-cell[data-astro-cid-64wbnxzx].cell-highlight{background:#e0e7ffb3}.sudoku-cell[data-astro-cid-64wbnxzx].cell-same-num{background:#a5b4fcd9;color:#fff}.sudoku-cell[data-astro-cid-64wbnxzx].cell-selected{background:#c7d2fee6!important;outline:3px solid var(--primary-color, #4f46e5);outline-offset:-3px;z-index:2}.sudoku-cell[data-astro-cid-64wbnxzx].cell-error{background:#fecacae6!important;color:#dc2626!important}.cell-popover-menu[data-astro-cid-64wbnxzx]{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);z-index:200;background:#0f172aeb;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:2px solid var(--primary-color, #6366f1);border-radius:1rem;padding:.75rem;box-shadow:0 12px 30px #0006;display:flex;flex-direction:column;gap:.5rem;width:220px}.popover-numbers-grid[data-astro-cid-64wbnxzx]{display:grid;grid-template-columns:repeat(3,1fr);gap:.4rem}.btn-pop-num[data-astro-cid-64wbnxzx]{height:48px;display:flex;align-items:center;justify-content:center;background:var(--primary-color, #6366f1);color:#fff;border:none;border-radius:.5rem;font-size:1.3rem;font-weight:800;cursor:pointer;transition:background-color .12s;-webkit-tap-highlight-color:transparent}.btn-pop-num[data-astro-cid-64wbnxzx]:hover{background:var(--primary-hover, #4338ca)}.btn-pop-num[data-astro-cid-64wbnxzx]:active{transform:scale(.94)}.btn-pop-erase[data-astro-cid-64wbnxzx]{width:100%;padding:.5rem;background:#ef444440;border:1px solid rgba(239,68,68,.5);border-radius:.5rem;color:#fca5a5;font-weight:700;font-size:.85rem;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:.35rem;transition:background-color .15s}.btn-pop-erase[data-astro-cid-64wbnxzx]:hover{background:#ef444473}.modal-overlay[data-astro-cid-64wbnxzx]{position:fixed;inset:0;z-index:300;background:#00000080;display:flex;align-items:center;justify-content:center;padding:1rem}.modal-card[data-astro-cid-64wbnxzx]{background:var(--bg-surface, #ffffff);border-radius:.75rem;padding:1.25rem;max-width:400px;width:100%;box-shadow:0 10px 25px #0003}.modal-header[data-astro-cid-64wbnxzx]{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.modal-header[data-astro-cid-64wbnxzx] h3[data-astro-cid-64wbnxzx]{margin:0;font-size:1.1rem;font-weight:800}.btn-modal-close[data-astro-cid-64wbnxzx]{background:none;border:none;cursor:pointer;color:var(--text-muted, #64748b)}.modal-body[data-astro-cid-64wbnxzx]{display:flex;flex-direction:column;gap:1rem}.setting-row[data-astro-cid-64wbnxzx]{display:flex;justify-content:space-between;align-items:center;gap:1rem}.setting-title[data-astro-cid-64wbnxzx]{display:block;font-weight:700;font-size:.875rem}.setting-desc[data-astro-cid-64wbnxzx]{display:block;font-size:.75rem;color:var(--text-muted, #64748b)}@media (max-width: 500px){.diff-pill[data-astro-cid-64wbnxzx]{font-size:.7rem;padding:.12rem .35rem}.mistakes-badge[data-astro-cid-64wbnxzx] span[data-astro-cid-64wbnxzx]{display:none}}