@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #2563eb;--primary-hover: #1d4ed8;--secondary: #64748b;--success: #10b981;--error: #ef4444;--warning: #f59e0b;--bg-light: #f8fafc;--bg-white: #ffffff;--text-primary: #0f172a;--text-secondary: #64748b;--border: #e2e8f0;--shadow: rgba(0, 0, 0, .1);--shadow-lg: rgba(0, 0, 0, .15)}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app{min-height:100vh;padding:2rem 1rem;display:flex;flex-direction:column;align-items:center}.app.loading{justify-content:center}.loader{width:50px;height:50px;border:4px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%}header{text-align:center;margin-bottom:2rem}header h1{font-size:3rem;font-weight:700;color:#fff;text-shadow:0 2px 10px rgba(0,0,0,.2);letter-spacing:-.02em}main{width:100%;max-width:600px;display:flex;flex-direction:column;gap:2rem}.game-info{display:flex;gap:1rem;justify-content:center}.info-card{background:#fff;border-radius:16px;padding:1rem 1.5rem;display:flex;align-items:center;gap:1rem;box-shadow:0 4px 20px var(--shadow);min-width:150px}.info-card svg{color:var(--primary);flex-shrink:0}.info-content{display:flex;flex-direction:column;gap:.25rem}.info-label{font-size:.75rem;color:var(--text-secondary);font-weight:500;text-transform:uppercase;letter-spacing:.05em}.info-value{font-size:1.5rem;font-weight:700;color:var(--text-primary);line-height:1}.mistakes-value{color:var(--error)}.game-container{background:#fff;border-radius:20px;padding:2rem;box-shadow:0 10px 40px var(--shadow-lg);display:flex;flex-direction:column;gap:2rem}.sudoku-grid{display:grid;gap:0;width:100%;aspect-ratio:1;background:var(--text-primary);padding:3px;border-radius:12px;overflow:hidden;box-shadow:0 4px 20px var(--shadow)}.sudoku-row{display:grid;grid-template-columns:repeat(9,1fr);gap:0}.sudoku-row:not(:last-child){border-bottom:1px solid var(--border)}.sudoku-row:nth-child(3),.sudoku-row:nth-child(6){border-bottom:3px solid var(--text-primary)}.cell{aspect-ratio:1;border:none;background:#fff;font-size:1.5rem;font-weight:600;color:var(--text-primary);cursor:pointer;transition:all .15s ease;display:flex;align-items:center;justify-content:center;position:relative;border-right:1px solid var(--border)}.cell:nth-child(3n){border-right:3px solid var(--text-primary)}.cell:last-child{border-right:none}.cell:hover:not(.cell-fixed):not(:disabled){background:var(--bg-light)}.cell-fixed{color:var(--text-primary);font-weight:700;cursor:not-allowed;background:#f1f5f9}.cell-selected{background:#dbeafe!important;box-shadow:inset 0 0 0 2px var(--primary);z-index:1}.cell-error{background:#fee2e2!important;color:var(--error)!important;animation:shake .3s ease}.cell-solver-highlight{background:#fef3c7!important;box-shadow:inset 0 0 0 2px var(--warning);animation:pulse .5s ease}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-4px)}75%{transform:translate(4px)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}.number-pad{display:grid;grid-template-columns:repeat(5,1fr);gap:.75rem}.number-btn{aspect-ratio:1;border:none;background:var(--bg-light);font-size:1.25rem;font-weight:600;color:var(--text-primary);border-radius:12px;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 8px #0000000d}.number-btn:hover{background:var(--primary);color:#fff;box-shadow:0 4px 12px #2563eb4d}.number-btn:active{transform:scale(.95)}.erase-btn{background:var(--error);color:#fff}.erase-btn:hover{background:#dc2626}.controls{display:flex;flex-direction:column;gap:1.5rem}.difficulty-selector{display:flex;gap:.5rem;background:#fff;padding:.5rem;border-radius:12px;box-shadow:0 2px 10px var(--shadow)}.difficulty-btn{flex:1;padding:.75rem 1rem;border:none;background:transparent;color:var(--text-secondary);font-weight:600;font-size:.875rem;border-radius:8px;cursor:pointer;transition:all .2s ease;text-transform:capitalize}.difficulty-btn:hover{background:var(--bg-light)}.difficulty-btn.active{background:var(--primary);color:#fff;box-shadow:0 2px 8px #2563eb4d}.action-buttons{display:grid;grid-template-columns:repeat(2,1fr);gap:.75rem}.btn{padding:.875rem 1.25rem;border:none;border-radius:12px;font-size:.875rem;font-weight:600;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center;gap:.5rem;box-shadow:0 2px 8px var(--shadow)}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover);box-shadow:0 4px 16px #2563eb4d}.btn-secondary{background:var(--secondary);color:#fff}.btn-secondary:hover{background:#475569;box-shadow:0 4px 16px #64748b4d}.btn-hint{background:var(--warning);color:#fff}.btn-hint:hover{background:#d97706;box-shadow:0 4px 16px #f59e0b4d}.btn-validate{background:var(--success);color:#fff}.btn-validate:hover{background:#059669;box-shadow:0 4px 16px #10b9814d}.btn-solve{background:#8b5cf6;color:#fff}.btn-solve:hover{background:#7c3aed;box-shadow:0 4px 16px #8b5cf64d}.btn-pause{background:var(--error);color:#fff}.btn-pause:hover{background:#dc2626;box-shadow:0 4px 16px #ef44444d}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:center;justify-content:center;padding:1rem;z-index:100;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal{background:#fff;border-radius:24px;padding:3rem 2rem;max-width:400px;width:100%;text-align:center;box-shadow:0 20px 60px #0000004d;display:flex;flex-direction:column;align-items:center;gap:1.5rem}.trophy-icon{color:#fbbf24;filter:drop-shadow(0 4px 12px rgba(251,191,36,.4))}.modal h2{font-size:2rem;font-weight:700;color:var(--text-primary);margin:0}.modal p{font-size:1.125rem;color:var(--text-secondary);margin:0}.modal-stats{display:flex;gap:2rem;font-size:1rem;color:var(--text-primary);font-weight:600}.modal .btn{width:100%;padding:1rem 2rem;font-size:1rem}.notification{position:fixed;top:2rem;left:50%;transform:translate(-50%);background:#fff;color:var(--text-primary);padding:1rem 1.5rem;border-radius:12px;box-shadow:0 10px 40px var(--shadow-lg);display:flex;align-items:center;gap:1rem;font-weight:600;z-index:200;min-width:300px}.notification button{background:transparent;border:none;cursor:pointer;color:var(--text-secondary);display:flex;align-items:center;justify-content:center;padding:.25rem;border-radius:6px;transition:all .2s ease}.notification button:hover{background:var(--bg-light)}@media (max-width: 640px){header h1{font-size:2rem}.game-container{padding:1rem}.cell{font-size:1.125rem}.number-btn{font-size:1rem}.action-buttons{grid-template-columns:1fr}.game-info{flex-direction:column}.info-card{width:100%}}@media (max-width: 480px){.app{padding:1rem .5rem}main{gap:1rem}.game-container{border-radius:16px;gap:1rem}.cell{font-size:1rem}.number-pad{gap:.5rem}.modal{padding:2rem 1.5rem}.modal h2{font-size:1.5rem}}