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#667eea66;transform:scale(1.1)}.sudoku-cell.selected.empty-cell{background:linear-gradient(135deg,#8b5cf6,#a855f7)!important;color:#fff;box-shadow:0 .25rem .5rem #8b5cf699,0 0 0 .125rem #a855f74d,inset 0 .0625rem .125rem #fff3;transform:scale(1.15);border:.125rem solid rgba(168,85,247,.4);animation:purplePulse 1.5s ease-in-out infinite}@keyframes purplePulse{0%,to{box-shadow:0 .25rem .5rem #8b5cf699,0 0 0 .125rem #a855f74d,inset 0 .0625rem .125rem #fff3}50%{box-shadow:0 .375rem .75rem #8b5cf6cc,0 0 0 .1875rem #a855f780,inset 0 .0625rem .125rem #ffffff4d}}.sudoku-cell.highlighted{background:#f3e5f5!important;box-shadow:0 .125rem .25rem #9c27b04d;border:.0625rem solid rgba(156,39,176,.2)}.sudoku-cell.same-number{background:#8e24aa!important;color:#fff!important;box-shadow:0 .25rem .5rem #8e24aa80;transform:scale(1.08);font-weight:700;border:.125rem solid rgba(142,36,170,.8)}.sudoku-cell.related-to-same-number{background:#faf5ff!important;box-shadow:0 .0625rem .1875rem #9c27b033}.sudoku-cell.green-highlighted{background:#c6f6d5!important;color:#22543d!important;box-shadow:0 .125rem .25rem #48bb7866;animation:greenHighlight 2s ease-in-out}.sudoku-cell.error{background:#fed7d7!important;color:#e53e3e!important;box-shadow:0 .125rem .25rem #e53e3e66}.sudoku-cell:disabled{cursor:default}.notes-container{position:absolute;top:-.35rem;left:-.35rem;right:-.35rem;bottom:-.35rem;display:grid;grid-template-columns:1fr 1fr;grid-template-rows:1fr 1fr;pointer-events:none}.note{display:flex;align-items:center;justify-content:center;font-size:.5rem;font-weight:500;color:#667eea}.note.top-left{align-items:flex-start;justify-content:flex-start;padding:.15rem 0 0 .15rem}.note.top-right{align-items:flex-start;justify-content:flex-end;padding:.15rem .15rem 0 0}.note.bottom-left{align-items:flex-end;justify-content:flex-start;padding:0 0 .15rem .15rem}.note.bottom-right{align-items:flex-end;justify-content:flex-end;padding:0 .15rem .15rem 0}.control-button.notes-active{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:1px solid #5a67d8}.control-button.notes-active:hover:not(:disabled){background:linear-gradient(135deg,#5a67d8,#6b46c1);border-color:#4c51bf;transform:scale(1.02);box-shadow:0 .25rem .375rem #667eea4d}.control-button.notes-active:active:not(:disabled){transform:scale(.98);background:linear-gradient(135deg,#4c51bf,#553c9a)}.sudoku-cell.animating{animation:cellAnimation .1s ease-out;background:#e8f4fd!important;color:#1976d2!important;font-weight:700;box-shadow:0 .125rem .25rem #1976d24d;border:.0625rem solid rgba(25,118,210,.2);transform:scale(1.02);cursor:not-allowed}@keyframes cellAnimation{0%{transform:scale(1);opacity:.8}50%{transform:scale(1.05);opacity:1}to{transform:scale(1.02);opacity:1}}.digit-buttons-container{width:100%;margin:.75rem 0 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