:root{--bg-primary:#f3f0e7;--bg-accent:#e8eef7;--surface:#ffffffe6;--surface-strong:#fff;--surface-soft:#f8fafc;--surface-muted:#eef2f7;--border:#94a3b847;--border-strong:#0f172a;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#64748b;--accent:#2563eb;--accent-soft:#dbeafe;--accent-soft-strong:#bfdbfe;--highlight:#e8f1ff;--highlight-value:#60a5fa80;--same-number-bg:#3b82f652;--same-number-ring:#2563ebe0;--same-number-text:#1d4ed8;--same-number-icon-glow:#3b82f647;--related-bg:#93c5fd33;--conflict-bg:#fca5a5f5;--error-bg:#fecacaeb;--error-text:#dc2626;--given-bg:#e2e8f0;--player-entry:#1d4ed8;--danger:#dc2626;--shadow:0 20px 45px #0f172a14;color:var(--text-primary);background:radial-gradient(circle at top, var(--bg-primary) 0%, #f7f4ee 38%, var(--bg-accent) 100%);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe 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.cell.same-number-cell .digit-fallback{color:#eff6ff}:root[data-theme=dark] .board-frame.board-skin-only .cell.same-number-cell .cell-icon,:root[data-theme=dark] .board-frame.board-skin-only .cell.same-number-cell .number-icon{filter:drop-shadow(0 0 12px #bfdbfe57)brightness(1.14)saturate(1.14)}:root[data-theme=dark] .board-frame.board-skin-only .cell.selected-cell{background:#60a5fa6b!important;box-shadow:inset 0 0 0 3px #bfdbfefa,inset 0 0 26px #bfdbfe2e!important}:root[data-theme=dark] .board-frame.board-skin-only .cell.selected-cell.same-number-cell{background:#60a5fa7a!important;box-shadow:inset 0 0 0 3px #bfdbfefc,inset 0 0 28px #bfdbfe2e!important}:root[data-theme=dark] .board-frame.board-skin-only .cell.error-cell,:root[data-theme=dark] .board-frame.board-skin-only .cell.error-cell.related-cell,:root[data-theme=dark] .board-frame.board-skin-only .cell.error-cell.same-number-cell,:root[data-theme=dark] .board-frame.board-skin-only .cell.error-cell.selected-cell,:root[data-theme=dark] .board-frame.board-skin-only .cell.conflict-cell,:root[data-theme=dark] .board-frame.board-skin-only .cell.conflict-cell.related-cell,:root[data-theme=dark] .board-frame.board-skin-only .cell.conflict-cell.same-number-cell,:root[data-theme=dark] .board-frame.board-skin-only .cell.conflict-cell.selected-cell{color:#ffe4e6!important;background:#f8717147!important;box-shadow:inset 0 0 0 2px #fca5a5f2!important}:root[data-theme=dark] .board-frame.board-skin-only .cell.error-cell .cell-value,:root[data-theme=dark] .board-frame.board-skin-only .cell.conflict-cell .cell-value,:root[data-theme=dark] .board-frame.board-skin-only .cell.error-cell .digit-fallback,:root[data-theme=dark] .board-frame.board-skin-only .cell.conflict-cell .digit-fallback{color:#ffe4e6!important}.cell.given{color:var(--text-primary);font-weight:850}.cell.given:not(.related-cell):not(.same-number-cell):not(.conflict-cell):not(.error-cell):not(.selected-cell){background:var(--given-bg)}.cell.player-entry{color:var(--player-entry);background-color:#93c5fd42}.cell.player-entry:not(.mistake):not(.error-cell):not(.conflict-cell) .cell-value-icon{filter:drop-shadow(1px 0 0 var(--player-entry)) drop-shadow(-1px 0 0 var(--player-entry)) drop-shadow(0 1px 0 var(--player-entry)) drop-shadow(0 -1px 0 var(--player-entry))}.cell.mistake,.cell.error-cell,.cell.error-cell.related-cell,.cell.error-cell.same-number-cell,.cell.error-cell.selected-cell,.cell.error-cell.conflict-cell{z-index:5;background:var(--error-bg)!important;color:var(--error-text)!important;box-shadow:inset 0 0 0 2px #ef4444e6!important}.cell.conflict-cell,.cell.conflict-cell.related-cell,.cell.conflict-cell.same-number-cell,.cell.conflict-cell.selected-cell{z-index:6;animation:.65s 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.cell.conflict-cell.same-number-cell,:root[data-theme=dark] .cell.conflict-cell.selected-cell{z-index:6;background:var(--conflict-bg)!important;color:var(--error-text)!important;box-shadow:inset 0 0 0 2px #fca5a5f2,0 0 0 1px #fca5a524!important}:root[data-theme=dark] .cell.error-cell .cell-value,:root[data-theme=dark] .cell.conflict-cell .cell-value,:root[data-theme=dark] .cell.error-cell .digit-fallback,:root[data-theme=dark] .cell.conflict-cell .digit-fallback,:root[data-theme=dark] .cell.error-cell,:root[data-theme=dark] .cell.conflict-cell{font-weight:800;color:var(--error-text)!important}.cell.box-edge-right{border-right:2px solid var(--border-strong)}.cell.box-edge-bottom{border-bottom:2px solid var(--border-strong)}.cell:focus-visible,.primary-button:focus-visible,.secondary-button:focus-visible,.neutral-button:focus-visible,.numpad-button:focus-visible{z-index:1;outline:3px solid 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cubic-bezier(.34,1.56,.64,1),box-shadow .18s,border-color .18s;display:flex;box-shadow:0 4px 14px -1px #0000001f,0 2px 5px -1px #00000014,inset 0 1px 1px #fffffff2}.skin-toggle-fab:hover{border-color:#8b5cf6a6;transform:translateY(-1px)scale(1.08);box-shadow:0 6px 18px -1px #8b5cf652,0 2px 6px -1px #0000001a,inset 0 1px 1px #fff}.skin-toggle-fab:active{transform:scale(.92)}.skin-toggle-icon{filter:drop-shadow(0 2px 3px #00000029);width:22px;height:22px;display:block}:root[data-theme=dark] .skin-toggle-fab{background:linear-gradient(145deg,#1e293bf5,#0f172aeb);border-color:#a78bfa66;box-shadow:0 4px 16px -1px #00000073,0 2px 6px -1px #0000004d,inset 0 1px 1px #ffffff29}:root[data-theme=dark] .skin-toggle-fab:hover{border-color:#a78bfab3;box-shadow:0 6px 20px -1px #a78bfa61,0 2px 6px -1px #0006,inset 0 1px 1px #ffffff40}@media (width>=769px){.skin-fab-group,.skin-toggle-fab{display:none!important}}@media 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