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.upload-icon{font-size:2rem;margin-bottom:8px}.drop-zone-small p{font-size:.95rem;margin:5px 0}.requirements-small{margin-top:15px;max-width:100%}.requirements-small .requirements-title{font-size:.85rem;margin-bottom:6px}.requirements-small .requirements-items{font-size:.8rem}.requirements-small .requirements-items li{margin:4px 0;padding-left:18px}.preview-controls label{display:flex;align-items:center;gap:8px;font-weight:500;color:#333}.background-upload-label{display:flex;align-items:center;gap:8px}.btn-upload{padding:6px 12px;font-size:.85rem}.btn-remove{padding:6px 12px;font-size:.85rem;border-color:#e74c3c;color:#e74c3c}.btn-remove:hover{background:#e74c3c;color:#fff}.preview-controls input[type=number]{width:60px;padding:6px 8px;border:1px solid #ddd;border-radius:4px;font-size:.9rem}.btn-preview{padding:8px 16px;border:1px solid #667eea;background:#fff;color:#667eea;border-radius:4px;cursor:pointer;font-size:.9rem;transition:all .2s ease}.btn-preview:hover{background:#667eea;color:#fff}.btn-preview:disabled{opacity:.5;cursor:not-allowed}.frame-counter{margin-left:auto;font-weight:500;color:#666}.canvas-container{display:flex;justify-content:center;padding:20px;background:#f9f9f9;border-radius:4px}.preview-canvas{border:2px solid #ddd;border-radius:4px;background:#fff;image-rendering:pixelated;image-rendering:-moz-crisp-edges;image-rendering:crisp-edges;max-width:100%;height:auto}.spritesheet-generator{background:#fff;border-radius:12px;padding:30px;box-shadow:0 10px 40px #0000001a}.upload-section{margin-bottom:30px}.drop-zone{border:3px dashed #667eea;border-radius:8px;padding:40px;text-align:center;cursor:pointer;transition:all .3s ease;background:#f8f9ff}.drop-zone:hover{border-color:#764ba2;background:#f0f2ff}.drop-zone.drag-over{border-color:#764ba2;background:#e8ebff;transform:scale(1.02)}.drop-zone-content{pointer-events:none}.upload-icon{font-size:3rem;margin-bottom:10px}.drop-zone p{font-size:1.1rem;color:#333;margin:5px 0}.drop-zone .hint{font-size:.9rem;color:#666}.requirements-list{margin-top:20px;text-align:left;max-width:500px;margin-left:auto;margin-right:auto}.requirements-title{font-size:.95rem;font-weight:600;color:#333;margin-bottom:8px}.requirements-items{font-size:.85rem;color:#555;list-style:none;padding:0;margin:0}.requirements-items li{margin:6px 0;padding-left:20px;position:relative}.requirements-items li:before{content:"•";position:absolute;left:0;color:#667eea;font-weight:700}.requirements-items code{background:#f0f0f0;padding:2px 6px;border-radius:3px;font-size:.85em;font-family:Courier New,monospace;color:#d63384}.images-info{margin-top:20px}.images-info h3{margin-bottom:15px;color:#333}.image-list{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:15px}.image-item{display:flex;flex-direction:column;align-items:center;padding:8px;border:1px solid #ddd;border-radius:4px;background:#f9f9f9;max-width:100px}.image-item img{width:60px;height:60px;object-fit:contain;margin-bottom:5px}.image-item span{font-size:.75rem;text-align:center;word-break:break-all;color:#666}.image-item.more{justify-content:center;font-weight:700;color:#667eea}.dimensions-info{color:#666;font-size:.9rem}.controls-section{margin-bottom:30px;padding:15px 20px;background:#f8f9ff;border-radius:8px}.controls-section h3{margin-bottom:20px;color:#333}.control-group{margin-bottom:20px}.control-group label{display:block;margin-bottom:5px;font-weight:500;color:#333}.control-group input,.control-group select{width:100%;padding:8px 12px;border:1px solid #ddd;border-radius:4px;font-size:1rem;margin-top:5px}.control-group .hint{display:block;font-size:.85rem;color:#666;margin-top:5px;font-style:italic}.button-group{display:flex;gap:10px;margin-top:0}.btn{padding:12px 24px;border:none;border-radius:6px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s ease}.btn-primary{background:#667eea;color:#fff}.btn-primary:hover:not(:disabled){background:#5568d3;transform:translateY(-1px);box-shadow:0 4px 12px #667eea66}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-secondary{background:#e0e0e0;color:#333}.btn-secondary:hover{background:#d0d0d0}.btn-download{background:#10b981;color:#fff;font-size:1.1rem;padding:14px 28px;margin-top:30px}.btn-download:hover{background:#059669;transform:translateY(-1px);box-shadow:0 4px 12px #10b98166}.result-section{margin-top:30px;padding:20px;background:#f0fdf4;border-radius:8px;border:2px solid #10b981}.result-section h3{margin-bottom:15px;color:#059669}.spritesheet-info{margin-bottom:20px}.spritesheet-info p{margin:5px 0;color:#333;font-weight:500}.spritesheet-preview-container{margin:20px 0;text-align:center;background:#f9f9f9;padding:20px;border-radius:8px;overflow-x:auto}.spritesheet-image{max-width:100%;height:auto;border:1px solid #ddd;border-radius:4px;box-shadow:0 2px 8px #0000001a}.App{max-width:1200px;margin:0 auto}.App-header{text-align:center;color:#fff;margin-bottom:30px}.App-header h1{font-size:2.5rem;margin-bottom:10px;text-shadow:2px 2px 4px rgba(0,0,0,.2)}.App-header p{font-size:1.1rem;opacity:.9}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;padding:20px}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}