:root{--primary: #000000;--primary-dark: #1a1a1a;--secondary: #f0f0f0;--success: #4CAF50;--warning: #ff9800;--error: #f44336;--info: #2196F3;--text: #333;--text-light: #666;--border: #ddd;--shadow: 0 2px 10px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 30px rgba(0, 0, 0, .2);--radius: 8px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);min-height:100vh;color:var(--text)}.app-container{display:flex;min-height:100vh;background:#fffffff2}.app-header{background:#fff;padding:1rem 2rem;box-shadow:var(--shadow);position:sticky;top:0;z-index:100}.app-title{font-size:2rem;background:linear-gradient(135deg,var(--primary),var(--primary-dark));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;display:inline-block}.main-content{display:flex;flex:1;gap:2rem;padding:2rem}.canvas-section{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:600px}.controls-section{width:320px;background:#fff;border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow);height:fit-content;position:sticky;top:80px}.upload-dropzone{border:3px dashed var(--primary);border-radius:15px;padding:4rem 2rem;text-align:center;cursor:pointer;transition:all .3s ease;background:linear-gradient(135deg,#667eea0d,#764ba20d);width:100%;max-width:600px}.upload-dropzone:hover{background:linear-gradient(135deg,#667eea1a,#764ba21a);transform:translateY(-2px);box-shadow:var(--shadow)}.upload-dropzone.dragover{background:linear-gradient(135deg,#667eea33,#764ba233);border-color:var(--primary-dark)}.upload-dropzone.loading{pointer-events:none;opacity:.7}.upload-icon{color:var(--primary);margin-bottom:1rem}.upload-title{color:var(--text);font-size:1.5rem;margin-bottom:.5rem}.upload-text{color:var(--text-light);margin-bottom:.5rem}.upload-subtext{color:#999;font-size:.875rem}#main-canvas{border-radius:var(--radius);box-shadow:var(--shadow-lg);max-width:100%;height:auto;background:#fff}.canvas-controls{margin-top:1rem;display:flex;gap:1rem}.controls-panel{display:flex;flex-direction:column;gap:1.5rem}.controls-title{font-size:1.5rem;color:var(--text);margin-bottom:1rem}.control-section{border-bottom:1px solid var(--border);padding-bottom:1.5rem}.control-section:last-child{border-bottom:none;padding-bottom:0}.control-section h3{color:var(--text);font-size:1.1rem;margin-bottom:1rem}.control-group{margin-bottom:1rem}.control-group label{display:block;margin-bottom:.5rem;color:var(--text-light);font-weight:500}input[type=range]{width:100%;height:6px;border-radius:3px;background:var(--secondary);outline:none;-webkit-appearance:none;appearance:none}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;border-radius:50%;background:var(--primary);cursor:pointer;transition:all .2s}input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.2);box-shadow:0 2px 8px #667eea66}.range-value{text-align:center;color:var(--text-light);font-size:.875rem;margin-top:.25rem}.switch{position:relative;display:inline-block;width:50px;height:24px;margin-right:.5rem}.switch input{opacity:0;width:0;height:0}.slider{position:absolute;cursor:pointer;inset:0;background-color:#ccc;transition:.3s;border-radius:24px}.slider:before{position:absolute;content:"";height:18px;width:18px;left:3px;bottom:3px;background-color:#fff;transition:.3s;border-radius:50%}input:checked+.slider{background-color:var(--primary)}input:checked+.slider:before{transform:translate(26px)}.switch-label{vertical-align:middle;color:var(--text)}.btn{padding:.75rem 1.5rem;border:none;border-radius:var(--radius);font-size:1rem;font-weight:500;cursor:pointer;transition:all .3s ease;width:100%;margin-bottom:.5rem}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 5px 15px #667eea66}.btn-secondary{background:var(--secondary);color:var(--text)}.btn-secondary:hover{background:#e0e0e0}.btn-danger{background:var(--error);color:#fff}.btn-danger:hover{background:#d32f2f}.toast-container{position:fixed;top:20px;right:20px;z-index:9999;pointer-events:none}.toast{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:1rem 1.5rem;margin-bottom:.5rem;min-width:300px;max-width:500px;pointer-events:auto;opacity:0;transform:translate(100%);transition:all .3s ease;display:flex;align-items:center;justify-content:space-between}.toast-show{opacity:1;transform:translate(0)}.toast-hide{opacity:0;transform:translate(100%)}.toast-content{display:flex;align-items:center;gap:.75rem}.toast-icon{font-size:1.25rem}.toast-success .toast-icon{color:var(--success)}.toast-error .toast-icon{color:var(--error)}.toast-warning .toast-icon{color:var(--warning)}.toast-info .toast-icon{color:var(--info)}.toast-message{color:var(--text)}.toast-close{background:none;border:none;font-size:1.5rem;color:var(--text-light);cursor:pointer;padding:0;margin-left:1rem}.toast-close:hover{color:var(--text)}.spinner{border:3px solid rgba(102,126,234,.2);border-top-color:var(--primary);border-radius:50%;width:40px;height:40px;animation:spin 1s linear infinite;margin:0 auto}@keyframes spin{to{transform:rotate(360deg)}}.keyboard-shortcuts{background:var(--secondary);border-radius:var(--radius);padding:1rem}.shortcuts-list{list-style:none;font-size:.875rem}.shortcuts-list li{margin-bottom:.5rem;color:var(--text-light)}kbd{background:#fff;border:1px solid var(--border);border-radius:4px;padding:2px 6px;font-family:monospace;font-size:.875rem;margin-right:.25rem}.hidden{display:none!important}.text-center{text-align:center}.mt-1{margin-top:.5rem}.mt-2{margin-top:1rem}.mt-3{margin-top:1.5rem}.mb-1{margin-bottom:.5rem}.mb-2{margin-bottom:1rem}.mb-3{margin-bottom:1.5rem}@media (hover: none) and (pointer: coarse){.btn{padding:1rem 1.5rem;font-size:1.1rem}input[type=range]{height:10px}input[type=range]::-webkit-slider-thumb{width:28px;height:28px}.control-group{margin-bottom:1.5rem}}@media (max-width: 1024px){.main-content{flex-direction:column;gap:1rem}.controls-section{width:100%;position:static;max-width:600px;margin:0 auto}.canvas-section{min-height:auto}}@media (max-width: 768px){.app-container,body{background:#fff}.app-header{padding:.75rem 1rem;position:fixed;width:100%;top:0;left:0;right:0}.main-content{padding:4rem .5rem}.controls-section{box-shadow:none;border:1px solid var(--border);border-radius:var(--radius) var(--radius) 0 0;margin-top:1rem}#main-canvas{max-width:100%;width:100%;height:auto;touch-action:pinch-zoom}.canvas-controls{position:sticky;bottom:60px;background:#fff;padding:.5rem;border-radius:var(--radius);box-shadow:var(--shadow-lg);z-index:50}.canvas-controls .btn{margin-bottom:0}.controls-panel{gap:1rem}.control-section{padding-bottom:1rem}.control-section h3{font-size:1rem;margin-bottom:.75rem}.control-section button{margin-bottom:.5rem}.control-section:last-of-type{display:grid;grid-template-columns:1fr 1fr;gap:.5rem}.control-section:last-of-type h3{grid-column:1 / -1}.control-section:last-of-type button{margin-bottom:0}.keyboard-shortcuts{display:none}div[style*="position: fixed; bottom: 0"]{font-size:.75rem!important;padding:.4rem!important}}@media (max-width: 480px){.app-header{padding:.5rem .75rem}.app-title{font-size:1.25rem}.main-content{padding:3.5rem .25rem}.upload-dropzone{padding:2rem 1rem;border-radius:10px}.upload-title{font-size:1.25rem}.upload-text{font-size:.9rem}.controls-section{padding:.75rem;border-radius:10px 10px 0 0}.controls-title{font-size:1.25rem;margin-bottom:.5rem}.toast-container{left:5px;right:5px;top:60px}.toast{min-width:auto;width:100%;padding:.75rem 1rem;font-size:.9rem}.control-section:last-of-type{grid-template-columns:1fr}.btn{font-size:.95rem;padding:.75rem 1rem}.range-value{font-size:.8rem}.control-group label{font-size:.9rem}}@media (max-height: 500px) and (orientation: landscape){.app-header{padding:.25rem 1rem}.app-title{font-size:1rem}.main-content{padding-top:2.5rem;flex-direction:row;gap:1rem}.canvas-section{flex:1}.controls-section{width:300px;height:calc(100vh - 5rem);overflow-y:auto}#main-canvas{max-height:calc(100vh - 8rem)}div[style*="position: fixed; bottom: 0"]{display:none!important}}