.global-nav{background:linear-gradient(135deg,#667eea 0,#764ba2 100%);padding:.75rem 1.5rem;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem;border-bottom:2px solid rgba(255,255,255,.2);box-shadow:0 2px 8px rgba(0,0,0,.1);position:sticky;top:0;z-index:100}.global-nav .home-link{font-weight:600;font-size:1.1rem;color:#fff;text-decoration:none;padding:.5rem 1rem;border-radius:.5rem;background:rgba(255,255,255,.1);transition:all .3s ease}.global-nav .home-link:hover{background:rgba(255,255,255,.2)}.global-nav .global-links{display:flex;flex-wrap:wrap;gap:.75rem}.global-nav .global-links a{color:#fff;text-decoration:none;font-size:.9rem;padding:.4rem .8rem;border-radius:.4rem;background:rgba(255,255,255,.05);transition:all .3s ease}.global-nav .global-links a:hover{background:rgba(255,255,255,.15)}.global-nav .global-links a.active{background:rgba(255,255,255,.25);font-weight:600}@media (max-width:768px){.global-nav{flex-direction:column;align-items:flex-start;padding:.75rem 1rem}.global-nav .global-links{width:100%;justify-content:flex-start}.global-nav .global-links a{font-size:.85rem;padding:.35rem .65rem}}:root{--primary:#4ecdc4;--secondary:#ff6b6b;--success:#45b7d1;--bg-light:#f8f9fa;--bg-white:#ffffff;--border:#e0e0e0;--text-dark:#333;--text-gray:#666;--shadow:0 2px 8px rgba(0, 0, 0, 0.08);--shadow-lg:0 4px 16px rgba(0, 0, 0, 0.12)}*{margin:0;padding:0;box-sizing:border-box}body,html{width:100%;height:100%;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;background-color:var(--bg-light);color:var(--text-dark)}.container{display:flex;flex-direction:column;min-height:100vh}.header{background:var(--bg-white);border-bottom:1px solid var(--border);padding:1.5rem 1rem;text-align:center}.header-content{max-width:1200px;margin:0 auto}.header h1{font-size:2rem;font-weight:700;margin-bottom:1.5rem;color:var(--text-dark);letter-spacing:-.5px}.brand-header{display:flex;align-items:center;justify-content:center;gap:1rem;margin-bottom:1.5rem}.logo{width:48px;height:48px;filter:drop-shadow(0 2px 4px rgba(0, 0, 0, .1));transition:transform .3s ease}.logo:hover{transform:scale(1.05)}.mode-tabs{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}.mode-tab{padding:.75rem 1.5rem;border:2px solid var(--border);background:var(--bg-light);color:var(--text-gray);border-radius:6px;cursor:pointer;font-size:1rem;font-weight:600;transition:all .3s ease}.mode-tab:hover{border-color:var(--primary);color:var(--primary)}.mode-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}.message{position:fixed;top:20px;left:50%;transform:translateX(-50%);padding:1rem 2rem;border-radius:8px;display:none;font-weight:500;animation:slideDown .3s ease-out;z-index:9999;max-width:90%;box-shadow:0 4px 12px rgba(0,0,0,.15)}.message.info{background-color:#e3f2fd;color:#1976d2}.message.success{background-color:#e8f5e9;color:#388e3c}.message.error{background-color:#ffebee;color:#d32f2f}@keyframes slideDown{from{opacity:0;transform:translateX(-50%) translateY(-20px)}to{opacity:1;transform:translateX(-50%) translateY(0)}}.info-section{background:var(--bg-white);border-bottom:1px solid var(--border);padding:2rem}.info-content{max-width:1200px;margin:0 auto}.info-content h2{font-size:1.5rem;font-weight:700;margin:2rem 0 1rem 0;color:var(--primary)}.info-content h2:first-child{margin-top:0}.info-content p{font-size:1rem;line-height:1.6;color:var(--text-gray);margin-bottom:1rem}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;margin:2rem 0}.feature{background:linear-gradient(135deg,rgba(78,205,196,.05) 0,rgba(69,183,209,.05) 100%);border:1px solid var(--border);border-radius:8px;padding:1.5rem;text-align:center;transition:all .3s ease}.feature:hover{border-color:var(--primary);box-shadow:var(--shadow);transform:translateY(-2px)}.feature-icon{font-size:2.5rem;display:block;margin-bottom:.75rem}.feature h3{font-size:1.1rem;font-weight:600;margin-bottom:.5rem;color:var(--text-dark)}.feature p{font-size:.9rem;color:var(--text-gray);margin:0}.steps-list{margin:1.5rem 0;padding-left:1.5rem;list-style:decimal}.steps-list li{margin-bottom:.75rem;color:var(--text-gray);line-height:1.6}.steps-list strong{color:var(--text-dark)}.main{flex:1;max-width:1200px;margin:0 auto;width:100%;padding:2rem;display:flex;flex-direction:column;gap:2rem}.input-pane{display:none}.input-pane.active{display:block}.drop-zone{border:2px dashed var(--border);border-radius:12px;padding:4rem 2rem;text-align:center;cursor:pointer;transition:all .3s ease;background:linear-gradient(135deg,rgba(78,205,196,.02) 0,rgba(69,183,209,.02) 100%)}.drop-zone:hover{border-color:var(--primary);background:linear-gradient(135deg,rgba(78,205,196,.05) 0,rgba(69,183,209,.05) 100%)}.drop-zone.drag-over{border-color:var(--primary);background:linear-gradient(135deg,rgba(78,205,196,.1) 0,rgba(69,183,209,.1) 100%)}.drop-zone-icon{font-size:3.5rem;display:block;margin-bottom:1rem}.drop-zone-content p{margin:.5rem 0;color:var(--text-gray);font-size:1.1rem}.drop-zone-or{margin:1.5rem 0!important;color:var(--border)!important;font-size:.9rem!important}.drop-zone-link{color:var(--primary);cursor:pointer;text-decoration:none;font-weight:600;font-size:1.1rem}.drop-zone-link:hover{text-decoration:underline}.file-types{font-size:.85rem;color:var(--text-gray);margin-top:1rem}.pieces-section{display:flex;flex-direction:column;gap:1.5rem;align-items:center;padding:2rem}.pieces-label{font-size:1rem;font-weight:600;color:var(--text-dark);margin:0}.color-picker{display:flex;gap:.75rem;padding:1.5rem;justify-content:center;flex-wrap:wrap;margin-bottom:1rem}.color-btn{width:48px;height:48px;border:2px solid #ccc;border-radius:8px;cursor:pointer;transition:all .2s ease;box-shadow:0 2px 4px rgba(0,0,0,.1)}.color-btn:hover{transform:scale(1.05);box-shadow:0 4px 8px rgba(0,0,0,.15)}.color-btn:active{transform:scale(.95)}.sub-label{font-size:.9rem;font-weight:600;color:var(--text-gray);margin:1rem 0 .75rem 0;text-transform:uppercase;letter-spacing:.5px}.piece-builder{display:flex;flex-direction:column;gap:1rem;padding:1.5rem;border:2px solid var(--border);border-radius:8px;background:var(--bg-light);align-items:center;margin-top:1rem}.piece-builder-grid{display:grid;grid-template-columns:repeat(5,32px);gap:4px;margin-bottom:1rem}.piece-builder-cell{width:32px;height:32px;border:1px solid var(--border);border-radius:4px;background:#fff;cursor:pointer;transition:all .2s ease}.piece-builder-cell:hover{border-color:var(--primary);box-shadow:0 0 4px rgba(78,205,196,.3)}.piece-builder-cell.active{background-color:var(--primary);border-color:var(--primary)}.btn-sm{padding:.6rem 1.2rem;font-size:.9rem;width:100%}.btn-add-piece{background:var(--success);color:#fff}.btn-add-piece:hover{background:#2d9bb3}.grid-section{display:flex;justify-content:center;padding:1rem 0}.grid-container{display:grid;grid-template-columns:repeat(8,1fr);gap:4px;background-color:#1a233a;padding:8px;border-radius:8px;aspect-ratio:1;width:100%;max-width:400px}.grid-cell{background-color:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:4px;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.2rem;transition:all .15s ease;user-select:none;min-height:40px;position:relative;-webkit-tap-highlight-color:transparent}.grid-cell[style*=background-color]{box-shadow:inset 4px 4px 0 rgba(255,255,255,.3),inset -4px -4px 0 rgba(0,0,0,.2);border:1px solid rgba(0,0,0,.1)}.solution-cell{box-shadow:inset 4px 4px 0 rgba(255,255,255,.5),inset -4px -4px 0 rgba(0,0,0,.3),0 0 10px rgba(255,255,255,.5)!important;border:2px solid #fff!important;z-index:10;animation:pulse 1.5s infinite}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(.95)}100%{transform:scale(1)}}.grid-cell:hover{transform:scale(1.05);box-shadow:var(--shadow);z-index:5}.grid-cell:active{transform:scale(.95)}.solve-section{display:flex;justify-content:center;padding:1rem 0}.btn{padding:.85rem 2rem;border:none;border-radius:6px;cursor:pointer;font-size:1rem;font-weight:600;transition:all .2s ease;display:inline-flex;align-items:center;justify-content:center;gap:.5rem;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none;touch-action:manipulation;min-height:44px}.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.btn:active{transform:translateY(0);opacity:.9}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:#3ab8b1}.btn-secondary{background:var(--bg-light);color:var(--text-dark);border:1px solid var(--border)}.btn-secondary:hover{background:#f0f0f0}.btn-solve{background:var(--success);color:#fff;padding:1rem 3rem;font-size:1.1rem;min-width:200px}.btn-solve:hover{background:#2d9bb3}.results-container{display:flex;flex-direction:column;gap:1.5rem}.move-recommendation{background:var(--bg-white);border:1px solid var(--border);border-radius:8px;padding:1.5rem;transition:all .2s ease;box-shadow:var(--shadow)}.move-recommendation:hover{border-color:var(--primary);box-shadow:var(--shadow-lg)}.move-recommendation h3{font-size:1.2rem;margin-bottom:1rem;color:var(--primary)}.move-scores{display:flex;flex-wrap:wrap;gap:1rem;margin-bottom:1rem}.score-badge{background:var(--bg-light);padding:.5rem 1rem;border-radius:4px;font-size:.9rem;font-weight:500}.score-badge strong{color:var(--primary);font-weight:700}.apply-btn{width:100%;padding:.75rem;background:var(--success);color:#fff;border:none;border-radius:6px;cursor:pointer;font-size:1rem;font-weight:600;transition:all .2s ease;min-height:44px}.apply-btn:hover{background:#2d9bb3}@media (max-width:768px){.info-section{padding:1.5rem 1rem}.info-content h2{font-size:1.25rem}.features-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}.header{padding:1rem}.header h1{font-size:1.5rem;margin-bottom:1rem}.brand-header{gap:.75rem;margin-bottom:1rem}.logo{width:40px;height:40px}.mode-tabs{gap:.75rem}.mode-tab{padding:.65rem 1.25rem;font-size:.95rem}.main{padding:1.5rem 1rem;gap:1.5rem}.drop-zone{padding:3rem 1.5rem}.drop-zone-icon{font-size:3rem}.drop-zone-content p{font-size:1rem}.pieces-section{padding:1.5rem}.pieces-grid{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:1rem}.color-picker{padding:1.2rem;gap:.6rem}.color-btn{width:44px;height:44px}.piece-builder{padding:1.2rem}.piece-builder-grid{grid-template-columns:repeat(5,28px);gap:3px}.piece-builder-cell{width:28px;height:28px}.grid-container{max-width:100%}.btn-solve{width:100%;min-width:auto}}.steps-header{font-size:1.5rem;font-weight:700;margin-bottom:1.5rem;color:var(--text-dark);text-align:center}.placement-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:2rem;margin-top:1rem}.placement-step{background:var(--bg-white);border:1px solid var(--border);border-radius:12px;padding:1.5rem;display:flex;flex-direction:column;align-items:center;gap:1rem;box-shadow:var(--shadow);transition:all .3s ease}.placement-step:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:var(--primary)}.placement-step h3{font-size:1.2rem;font-weight:700;color:var(--primary);margin:0}.step-score{font-size:.9rem;color:var(--text-gray);font-weight:600;margin:0}.mini-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:2px;background-color:#1a233a;padding:4px;border-radius:6px;width:160px;aspect-ratio:1}.mini-cell{background-color:rgba(255,255,255,.05);border-radius:2px;width:100%;height:100%}.apply-btn-small{width:100%;padding:.6rem;background:var(--primary);color:#fff;border:none;border-radius:6px;cursor:pointer;font-size:.9rem;font-weight:600;transition:all .2s ease}.apply-btn-small:hover{background:#3ab8b1;transform:scale(1.02)}@media (max-width:600px){.placement-steps{grid-template-columns:1fr;gap:1.5rem}.mini-grid{width:200px}.header h1{font-size:1.25rem;margin-bottom:.75rem}.mode-tabs{gap:.5rem}.mode-tab{padding:.6rem 1rem;font-size:.9rem;border-radius:4px}.main{padding:1rem;gap:1rem}.drop-zone{padding:2rem 1rem}.drop-zone-icon{font-size:2.5rem;margin-bottom:.75rem}.drop-zone-content p{font-size:.95rem}.pieces-section{padding:1rem}.pieces-label{font-size:.9rem}.pieces-grid{grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:.8rem}.color-picker{padding:1rem;gap:.6rem}.color-btn{width:40px;height:40px}.piece-builder{padding:1rem;gap:.8rem}.piece-builder-grid{grid-template-columns:repeat(5,26px);gap:2px}.piece-builder-cell{width:26px;height:26px}.btn-sm{padding:.5rem 1rem;font-size:.85rem}.form-control{padding:.7rem;font-size:.95rem}.control-group label{font-size:.85rem}.grid-container{max-width:90vw}.btn{padding:.7rem 1.25rem;font-size:.95rem}.btn-solve{padding:.85rem 1.5rem}.move-recommendation{padding:1rem}.move-scores{gap:.75rem}.score-badge{padding:.4rem .75rem;font-size:.85rem}}@media (max-width:480px){.header h1{font-size:1.1rem}.brand-header{gap:.5rem;margin-bottom:.75rem}.logo{width:36px;height:36px}.mode-tab{padding:.55rem .9rem;font-size:.85rem}.main{padding:.75rem}.drop-zone{padding:1.5rem .75rem}.drop-zone-icon{font-size:2rem}.pieces-section{padding:.75rem}.pieces-grid{grid-template-columns:1fr;gap:.75rem}.color-picker{padding:.9rem;gap:.5rem}.color-btn{width:36px;height:36px}.piece-builder{padding:.9rem;gap:.7rem}.piece-builder-grid{grid-template-columns:repeat(5,24px);gap:2px}.piece-builder-cell{width:24px;height:24px}.btn-sm{padding:.5rem 1rem;font-size:.8rem}.grid-container{max-width:95vw}.message{padding:.8rem 1.5rem;font-size:.85rem;top:15px}.move-recommendation{padding:.75rem}}.footer{background:var(--bg-white);border-top:1px solid var(--border);padding:2rem 1rem;margin-top:auto}.footer-content{max-width:1200px;margin:0 auto;text-align:center;display:flex;flex-direction:column;gap:1rem}.footer-title{font-size:1rem;font-weight:600;color:var(--text-dark);margin:0}.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:1.5rem;margin:.5rem 0}.footer-link{color:var(--primary);text-decoration:none;font-weight:500;font-size:.95rem;transition:all .2s ease;position:relative}.footer-link::after{content:'';position:absolute;width:0;height:2px;bottom:-4px;left:50%;background-color:var(--primary);transition:all .3s ease;transform:translateX(-50%)}.footer-link:hover{color:#3ab8b1}.footer-link:hover::after{width:100%}.footer-copyright{font-size:.85rem;color:var(--text-gray);margin:.5rem 0 0 0}@media (max-width:600px){.footer{padding:1.5rem 1rem}.footer-links{flex-direction:column;gap:.75rem}.footer-link{font-size:.9rem}.footer-copyright{font-size:.8rem}}.available-pieces-section{padding:1.5rem;background:var(--bg-white);border-radius:8px;margin-top:1rem}.available-pieces-section h3{text-align:center;font-size:1.2rem;color:var(--primary);margin-bottom:1rem}.available-pieces-container{display:flex;justify-content:center;gap:2rem;flex-wrap:wrap}.piece-preview{display:flex;flex-direction:column;align-items:center;gap:.5rem}.piece-preview-label{font-size:.9rem;font-weight:600;color:var(--text-gray)}.piece-preview-grid{display:grid;gap:2px;background:var(--bg-light);padding:8px;border-radius:4px;border:2px solid var(--border)}.piece-preview-cell{width:24px;height:24px;border-radius:3px;background:rgba(255,255,255,.1);border:1px solid rgba(0,0,0,.1)}.piece-preview-cell.filled{box-shadow:inset 3px 3px 0 rgba(255,255,255,.3),inset -3px -3px 0 rgba(0,0,0,.2)}.region-selection{display:flex;flex-direction:column;gap:1.5rem;padding:1.5rem;background:var(--bg-white);border-radius:8px}.selection-header{text-align:center}.selection-header h3{font-size:1.3rem;font-weight:700;color:var(--primary);margin-bottom:.5rem}.selection-instructions{font-size:1rem;color:var(--text-gray);margin:0}#selectionStep{font-weight:700;color:var(--primary)}.image-canvas-container{display:flex;justify-content:center;align-items:center;background:var(--bg-light);border-radius:8px;padding:1rem;overflow:auto;max-height:70vh}#selectionCanvas{max-width:100%;height:auto;cursor:crosshair;border:2px solid var(--border);border-radius:4px;background:#fff}#selectionCanvas.drawing{cursor:crosshair}.selection-controls{display:flex;justify-content:center;gap:1rem;flex-wrap:wrap}.selection-controls .btn{min-width:140px}@media (max-width:768px){.region-selection{padding:1rem}.selection-header h3{font-size:1.1rem}.selection-instructions{font-size:.9rem}.image-canvas-container{padding:.5rem;max-height:50vh}.selection-controls{flex-direction:column}.selection-controls .btn{width:100%}}.hidden{display:none!important}