.game-container{max-width:550px;margin:0 auto}.game-controls{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:var(--spacing-md);margin-bottom:var(--spacing-lg);background:var(--bg-card);padding:var(--spacing-md);border-radius:var(--radius-lg);border:1px solid var(--color-border)}.difficulty-selector{display:flex;align-items:center;gap:var(--spacing-sm)}.difficulty-selector label{font-weight:500;color:var(--color-text-secondary);font-size:.9rem}.difficulty-buttons{display:flex;gap:.25rem}.diff-btn{padding:.4rem .8rem;background:var(--bg-body);border:1px solid var(--color-border);border-radius:var(--radius-sm);color:var(--color-text-secondary);font-family:inherit;font-size:.85rem;font-weight:500;cursor:pointer;transition:all .2s}.diff-btn:hover{background:var(--bg-card-hover);color:var(--color-text)}.diff-btn.active{background:var(--color-primary);border-color:var(--color-primary);color:var(--bg-body)}.game-stats{display:flex;gap:var(--spacing-lg)}.stat{display:flex;align-items:center;gap:.5rem}.stat-icon{font-size:1.1rem}.stat-value{font-family:'JetBrains Mono',monospace;font-size:1rem;font-weight:600;color:var(--color-text)}.sudoku-wrapper{display:flex;justify-content:center;margin-bottom:var(--spacing-lg)}.sudoku-board{display:grid;grid-template-columns:repeat(9,1fr);gap:0;background:var(--color-border);border:3px solid var(--color-primary);border-radius:var(--radius-md);overflow:hidden;width:100%;max-width:450px;aspect-ratio:1}.cell{aspect-ratio:1;display:flex;align-items:center;justify-content:center;background:var(--bg-card);font-family:'JetBrains Mono',monospace;font-size:clamp(1.2rem, 4vw, 1.8rem);font-weight:700;color:var(--color-text);cursor:pointer;transition:background .15s,color .15s;position:relative;user-select:none;border:1px solid var(--color-border)}.cell:nth-child(3n){border-right:2px solid var(--color-primary)}.cell:nth-child(9n){border-right:none}.cell:nth-child(n+19):nth-child(-n+27),.cell:nth-child(n+46):nth-child(-n+54){border-bottom:2px solid var(--color-primary)}.cell.fixed{background:var(--bg-body);color:var(--color-text);cursor:default}.cell.selected{background:var(--color-primary-muted);color:var(--color-primary)}.cell.highlighted{background:var(--color-primary-muted)}.cell.same-number{background:var(--color-primary-muted)}.cell.error{background:var(--color-danger-bg);color:var(--color-danger)}.cell.correct-anim{animation:correctPulse .3s ease}@keyframes correctPulse{0%{transform:scale(1)}50%{transform:scale(1.1);background:var(--color-success-bg)}100%{transform:scale(1)}}.cell .notes{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);position:absolute;inset:2px;font-size:clamp(.5rem, 1.5vw, .65rem);font-weight:500;color:var(--color-text-muted)}.cell .notes span{display:flex;align-items:center;justify-content:center}.number-pad{display:grid;grid-template-columns:repeat(5,1fr);gap:.5rem;margin-bottom:var(--spacing-lg);background:var(--bg-card);padding:var(--spacing-md);border-radius:var(--radius-lg);border:1px solid var(--color-border)}.num-btn{aspect-ratio:1;background:var(--bg-body);border:2px solid var(--color-border);border-radius:var(--radius-md);font-family:'JetBrains Mono',monospace;font-size:1.4rem;font-weight:700;color:var(--color-text);cursor:pointer;transition:all .15s}.num-btn:hover{background:var(--color-primary-muted);border-color:var(--color-primary);color:var(--color-primary)}.num-btn:active{transform:scale(.95)}.num-btn.erase{background:var(--color-danger-bg);border-color:var(--color-danger);color:var(--color-danger)}.num-btn.erase:hover{background:var(--color-danger);color:#fff}.num-btn.disabled{opacity:.3;pointer-events:none}.game-actions{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem;margin-bottom:var(--spacing-lg)}.action-btn{padding:var(--spacing-sm) var(--spacing-md);background:var(--bg-card);border:1px solid var(--color-border);border-radius:var(--radius-md);font-family:inherit;font-size:.85rem;font-weight:500;color:var(--color-text-secondary);cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:.35rem}.action-btn:hover{background:var(--bg-card-hover);border-color:var(--color-primary);color:var(--color-primary)}.action-btn.active{background:var(--color-primary-muted);border-color:var(--color-primary);color:var(--color-primary)}.game-options{display:flex;gap:var(--spacing-lg);justify-content:center;flex-wrap:wrap;margin-bottom:var(--spacing-lg)}.option-toggle{display:flex;align-items:center;gap:.5rem;cursor:pointer;color:var(--color-text-secondary);font-size:.85rem}.option-toggle input{width:16px;height:16px;accent-color:var(--color-primary)}.info-box{background:var(--bg-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--spacing-lg)}.info-box h3{margin-bottom:var(--spacing-sm);color:var(--color-text)}.info-box ul{margin:0;padding-left:1.25rem}.info-box li{margin-bottom:.4rem;color:var(--color-text-secondary);font-size:.9rem}.modal{display:none;position:fixed;inset:0;background:rgba(0,0,0,.8);align-items:center;justify-content:center;z-index:1000;padding:var(--spacing-md)}.modal.show{display:flex}.modal-content{background:var(--bg-card);border-radius:var(--radius-lg);padding:var(--spacing-xl);text-align:center;max-width:350px;width:100%;border:2px solid var(--color-primary);animation:modalIn .3s ease}@keyframes modalIn{from{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}.modal-icon{font-size:4rem;margin-bottom:var(--spacing-md)}.modal-content h2{font-size:1.5rem;color:var(--color-text);margin-bottom:var(--spacing-xs)}.modal-content p{color:var(--color-text-secondary);margin-bottom:var(--spacing-lg)}.win-stats{display:flex;justify-content:center;gap:var(--spacing-lg);margin-bottom:var(--spacing-lg)}.win-stat{display:flex;flex-direction:column;gap:.25rem}.win-stat .label{font-size:.75rem;color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.5px}.win-stat .value{font-family:'JetBrains Mono',monospace;font-size:1.2rem;font-weight:600;color:var(--color-primary)}@media (max-width:500px){.game-controls{flex-direction:column;gap:var(--spacing-sm)}.difficulty-selector{flex-direction:column;gap:.5rem}.game-stats{width:100%;justify-content:space-around}.game-actions{grid-template-columns:repeat(2,1fr)}.game-options{flex-direction:column;align-items:center;gap:var(--spacing-sm)}.sudoku-board{max-width:100%}.cell{font-size:clamp(1rem, 5vw, 1.5rem)}}@media print{.breadcrumb,.footer,.game-actions,.game-controls,.game-options,.info-box,.modal,.number-pad{display:none!important}.sudoku-board{border:2px solid #000}.cell{border:1px solid #ccc;background:#fff;color:#000}}