:root{--bg: #f8f9fa;--bg-card: #ffffff;--text: #1a1a2e;--text-secondary: #6c757d;--text-light: #adb5bd;--primary: #4361ee;--primary-light: #eef0ff;--primary-soft: #d0d7ff;--success: #2ec4b6;--success-light: #e8f8f5;--danger: #e63946;--danger-light: #fdecea;--warning: #f4a261;--border: #e9ecef;--border-strong: #ced4da;--cell-given: #1a1a2e;--cell-input: #4361ee;--cell-note: #6c757d;--highlight: #eef0ff;--highlight-same: #d0d7ff;--highlight-selected: #4361ee;--shadow-sm: 0 1px 3px rgba(0,0,0,.06);--shadow-md: 0 4px 12px rgba(0,0,0,.08);--shadow-lg: 0 8px 30px rgba(0,0,0,.12);--radius: 12px;--radius-sm: 8px;--radius-lg: 16px;--transition: .2s ease;--font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;overflow:hidden}body{font-family:var(--font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}button{cursor:pointer;font-family:var(--font)}.screen{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;transition:opacity .4s ease,transform .4s ease}.screen-active{opacity:1;transform:scale(1)}.menu-container{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;padding:24px;gap:20px}.logo-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:4px;width:140px;margin-bottom:4px}.logo-grid span{display:flex;align-items:center;justify-content:center;width:44px;height:44px;background:var(--primary);color:#fff;font-size:20px;font-weight:700;border-radius:10px;animation:logoIn .5s ease backwards}.logo-grid span:nth-child(1){animation-delay:.05s}.logo-grid span:nth-child(2){animation-delay:.1s}.logo-grid span:nth-child(3){animation-delay:.15s}.logo-grid span:nth-child(4){animation-delay:.2s}.logo-grid span:nth-child(5){animation-delay:.25s}.logo-grid span:nth-child(6){animation-delay:.3s}@keyframes logoIn{0%{opacity:0;transform:scale(.5) rotate(-10deg)}to{opacity:1;transform:scale(1) rotate(0)}}.menu-subtitle{color:var(--text-secondary);font-size:14px;font-weight:400;margin-bottom:8px}.difficulty-section{width:100%;max-width:320px}.difficulty-label{font-size:13px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:10px;text-align:center}.difficulty-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.diff-btn{display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px 4px;border:2px solid var(--border);background:var(--bg-card);border-radius:var(--radius);transition:all var(--transition)}.diff-btn.active{border-color:var(--primary);background:var(--primary-light)}.diff-btn:active{transform:scale(.95)}.diff-icon{font-size:18px}.diff-name{font-size:11px;font-weight:600;color:var(--text)}.btn-primary{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;max-width:320px;padding:16px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);font-size:16px;font-weight:600;transition:all var(--transition);box-shadow:0 4px 14px #4361ee59}.btn-primary:active{transform:scale(.97);box-shadow:0 2px 8px #4361ee4d}.btn-primary:disabled{opacity:.7;cursor:not-allowed}.btn-secondary{width:100%;max-width:320px;padding:14px;background:var(--bg-card);color:var(--primary);border:2px solid var(--primary);border-radius:var(--radius);font-size:15px;font-weight:600;transition:all var(--transition)}.btn-secondary:active{transform:scale(.97);background:var(--primary-light)}.btn-ghost{width:100%;max-width:320px;padding:14px;background:transparent;color:var(--text-secondary);border:none;border-radius:var(--radius);font-size:15px;font-weight:500;transition:all var(--transition)}.btn-ghost:active{background:var(--border)}.menu-stats{display:flex;gap:24px;margin-top:12px;padding-top:20px;border-top:1px solid var(--border)}.stat-item{display:flex;flex-direction:column;align-items:center;gap:2px}.stat-value{font-size:18px;font-weight:700;color:var(--text)}.stat-label{font-size:11px;color:var(--text-secondary);font-weight:500}.game-header{display:flex;align-items:center;padding:8px 12px;padding-top:max(8px,env(safe-area-inset-top));background:var(--bg-card);border-bottom:1px solid var(--border);min-height:56px}.icon-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border:none;background:transparent;color:var(--text);border-radius:var(--radius-sm);transition:all var(--transition)}.icon-btn:active{background:var(--border);transform:scale(.9)}.header-info{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px}.badge{font-size:12px;font-weight:600;color:var(--primary);background:var(--primary-light);padding:2px 10px;border-radius:20px}.header-stats{display:flex;gap:16px}.header-stat{display:flex;align-items:center;gap:4px;font-size:13px;font-weight:600;color:var(--text-secondary)}.mistakes-stat svg{color:var(--danger)}.game-main{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:8px 12px;gap:10px;overflow:hidden}.sudoku-board{display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);width:min(calc(100vw - 24px),400px);height:min(calc(100vw - 24px),400px);background:var(--border-strong);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-md);position:relative}.cell{display:flex;align-items:center;justify-content:center;background:var(--bg-card);font-size:clamp(16px,4.5vw,22px);font-weight:500;color:var(--cell-input);cursor:pointer;position:relative;transition:background .15s ease,color .15s ease;-webkit-user-select:none;user-select:none;border:.5px solid var(--border)}.cell-border-right{border-right:2px solid var(--border-strong)!important}.cell-border-bottom{border-bottom:2px solid var(--border-strong)!important}.cell.given{color:var(--cell-given);font-weight:700}.cell.selected{background:var(--highlight-selected)!important;color:#fff!important;z-index:2}.cell.selected.given{color:#fff!important}.cell.highlighted{background:var(--highlight)}.cell.same-number{background:var(--highlight-same)}.cell.error{background:var(--danger-light)!important;color:var(--danger)!important;animation:shake .4s ease}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-3px)}40%{transform:translate(3px)}60%{transform:translate(-2px)}80%{transform:translate(2px)}}.cell.correct-anim{animation:correctPop .35s ease}@keyframes correctPop{0%{transform:scale(1)}50%{transform:scale(1.15)}to{transform:scale(1)}}.cell.reveal-anim{animation:revealCell .4s ease}@keyframes revealCell{0%{transform:scale(0);opacity:0}60%{transform:scale(1.1)}to{transform:scale(1);opacity:1}}.cell.win-anim{animation:winCellPulse .4s ease forwards}@keyframes winCellPulse{0%{transform:scale(1);background:var(--bg-card)}50%{transform:scale(1.05);background:var(--success-light)}to{transform:scale(1);background:var(--success-light)}}.notes-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);width:100%;height:100%;position:absolute;top:0;right:0;bottom:0;left:0;padding:1px}.notes-grid span{display:flex;align-items:center;justify-content:center;font-size:clamp(7px,2vw,10px);font-weight:500;color:var(--cell-note);line-height:1}.cell-value{animation:popIn .25s ease}@keyframes popIn{0%{transform:scale(.3);opacity:0}70%{transform:scale(1.1)}to{transform:scale(1);opacity:1}}.game-tools{display:flex;justify-content:center;gap:6px;width:100%;max-width:400px}.tool-btn{display:flex;flex-direction:column;align-items:center;gap:3px;padding:8px 14px;border:none;background:var(--bg-card);color:var(--text-secondary);border-radius:var(--radius-sm);font-size:10px;font-weight:500;transition:all var(--transition);flex:1;max-width:80px}.tool-btn:active{transform:scale(.92);background:var(--border)}.tool-btn.active{background:var(--primary-light);color:var(--primary)}.tool-btn svg{width:20px;height:20px}.num-pad{display:grid;grid-template-columns:repeat(9,1fr);gap:6px;width:100%;max-width:400px;padding:0 4px}.num-btn{display:flex;align-items:center;justify-content:center;aspect-ratio:1;max-height:52px;border:none;background:var(--bg-card);color:var(--text);font-size:clamp(18px,5vw,24px);font-weight:600;border-radius:var(--radius-sm);transition:all var(--transition);box-shadow:var(--shadow-sm);position:relative}.num-btn:active{transform:scale(.9);background:var(--primary-light);color:var(--primary)}.num-btn.completed{opacity:.25;pointer-events:none}.num-btn.selected-num{background:var(--primary);color:#fff;box-shadow:0 2px 8px #4361ee59}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:100;padding:24px;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-content{background:var(--bg-card);border-radius:var(--radius-lg);padding:32px 24px;text-align:center;width:100%;max-width:340px;box-shadow:var(--shadow-lg);animation:modalIn .3s ease;position:relative;overflow:hidden}@keyframes modalIn{0%{transform:scale(.9) translateY(20px);opacity:0}to{transform:scale(1) translateY(0);opacity:1}}.modal-icon{font-size:48px;margin-bottom:12px}.modal-content h2{font-size:22px;font-weight:700;margin-bottom:8px}.modal-desc{color:var(--text-secondary);font-size:14px;margin-bottom:20px}.modal-time{font-size:36px;font-weight:700;color:var(--primary);margin-bottom:24px}.win-stats{display:flex;justify-content:center;gap:24px;margin-bottom:24px;padding:16px;background:var(--bg);border-radius:var(--radius)}.win-stat{display:flex;flex-direction:column;align-items:center;gap:4px}.win-stat-label{font-size:11px;color:var(--text-secondary);font-weight:500}.win-stat-value{font-size:16px;font-weight:700;color:var(--text)}.confetti-container{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;overflow:hidden;border-radius:var(--radius-lg)}.confetti-piece{position:absolute;width:8px;height:8px;border-radius:2px;top:-10px;animation:confettiFall 1.5s ease forwards}@keyframes confettiFall{0%{transform:translateY(0) rotate(0);opacity:1}to{transform:translateY(400px) rotate(720deg);opacity:0}}.loading-dots{display:flex;gap:4px;justify-content:center;padding:4px}.loading-dots span{width:8px;height:8px;border-radius:50%;background:#fff;animation:dotBounce 1s ease infinite}.loading-dots span:nth-child(2){animation-delay:.15s}.loading-dots span:nth-child(3){animation-delay:.3s}@keyframes dotBounce{0%,80%,to{transform:scale(.6);opacity:.4}40%{transform:scale(1);opacity:1}}@media (max-height: 650px){.game-main{gap:6px;padding:4px 12px}.tool-btn{padding:6px 10px}.num-btn{max-height:44px}.game-header{min-height:48px;padding:4px 12px}}@media (max-height: 580px){.game-tools{gap:4px}.tool-btn span{display:none}.tool-btn{padding:8px}.num-pad{gap:4px}.num-btn{max-height:38px;font-size:16px}}@media (min-width: 600px){.sudoku-board{width:400px;height:400px}}