:root{--bg-color: #0f0f1a;--surface-color: #1a1a2e;--surface-hover: #252542;--border-color: #2d2d4a;--text-primary: #ffffff;--text-secondary: #a0a0b8;--accent-color: #6366f1;--accent-hover: #4f46e5;--success-color: #10b981;--success-hover: #059669;--error-color: #ef4444;--shadow: 0 4px 6px -1px rgba(0, 0, 0, .3);--pixel-snap-color: #6366f1;--bg-removal-color: #10b981}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;background-color:var(--bg-color);color:var(--text-primary);min-height:100vh;line-height:1.6}.container{max-width:1000px;margin:0 auto;padding:2rem 1rem}header{text-align:center;margin-bottom:2rem}header h1{font-size:2.5rem;font-weight:700;background:linear-gradient(135deg,var(--accent-color),#a855f7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{color:var(--text-secondary);font-size:1.1rem;margin-top:.5rem}.feature-tabs{display:flex;gap:.5rem;justify-content:center;margin-bottom:1.5rem}.tab-btn{padding:.75rem 1.5rem;font-size:1rem;font-weight:600;border:2px solid var(--border-color);border-radius:8px;background-color:var(--surface-color);color:var(--text-secondary);cursor:pointer;transition:all .2s}.tab-btn:hover{border-color:var(--accent-color);color:var(--text-primary)}.tab-btn.active{border-color:var(--accent-color);background-color:var(--accent-color);color:#fff}.tab-btn[data-feature=bg-removal].active{border-color:var(--bg-removal-color);background-color:var(--bg-removal-color)}.upload-section{margin-bottom:1.5rem}.dropzone{border:2px dashed var(--border-color);border-radius:12px;padding:3rem 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.75rem;font-size:.95rem;border:1px solid var(--border-color);border-radius:6px;background-color:var(--bg-color);color:var(--text-primary);outline:none;transition:border-color .2s}.output-size-controls select{min-width:120px;cursor:pointer}.output-size-controls input[type=number]{width:100px}.output-size-controls select:focus,.output-size-controls input[type=number]:focus{border-color:var(--accent-color)}.output-size-controls input[type=number][hidden]{display:none}.size-info{display:block;margin-top:.25rem;font-size:.8rem;color:var(--text-secondary)}.model-container{flex:1;min-width:250px}.model-container label{display:block;margin-bottom:.5rem;font-weight:500}.model-container select{width:100%;padding:.5rem .75rem;font-size:.95rem;border:1px solid var(--border-color);border-radius:6px;background-color:var(--bg-color);color:var(--text-primary);cursor:pointer;outline:none;transition:border-color .2s}.model-container select:focus{border-color:var(--bg-removal-color)}.model-hint{display:block;margin-top:.25rem;font-size:.75rem;color:var(--text-secondary)}.device-container,.library-container,.model-container{min-width:180px}.device-container label,.library-container label,.model-container label{display:block;margin-bottom:.5rem;font-weight:500}.device-options,.library-options{display:flex;gap:1rem}.radio-label{display:flex;align-items:center;gap:.5rem;cursor:pointer}.radio-label input[type=radio]{accent-color:var(--bg-removal-color)}.model-container select{width:100%;padding:.5rem .75rem;font-size:.9rem;background-color:var(--surface-hover);color:var(--text-primary);border:1px solid var(--border-color);border-radius:6px;cursor:pointer}.model-container select:focus{outline:none;border-color:var(--bg-removal-color)}.progress-container{width:100%;max-width:300px}.progress-container[hidden]{display:none}.progress-bar{height:8px;background-color:var(--border-color);border-radius:4px;overflow:hidden}.progress-fill{height:100%;background-color:var(--bg-removal-color);transition:width .3s ease;width:0%}.progress-text{display:block;margin-top:.5rem;font-size:.8rem;color:var(--text-secondary);text-align:center}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;font-size:1rem;font-weight:600;border:none;border-radius:8px;cursor:pointer;transition:all .2s;min-width:160px}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background-color:var(--accent-color);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--accent-hover)}#bgRemoveBtn{background-color:var(--bg-removal-color)}#bgRemoveBtn:hover:not(:disabled){background-color:var(--success-hover)}.btn-success{background-color:var(--success-color);color:#fff}.btn-success:hover:not(:disabled){background-color:var(--success-hover)}.btn svg{width:20px;height:20px}.btn-loading,.btn.loading .btn-text{display:none}.btn.loading .btn-loading{display:inline}.preview-section{margin-bottom:1.5rem}.preview-container{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem}.preview-box{background-color:var(--surface-color);border-radius:12px;padding:1rem}.preview-box h3{font-size:.9rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary);margin-bottom:.75rem}.image-wrapper{position:relative;min-height:200px;background-color:var(--bg-color);border-radius:8px;display:flex;align-items:center;justify-content:center;overflow:hidden}.image-wrapper.checkered-bg{background-image:linear-gradient(45deg,#2a2a3e 25%,transparent 25%),linear-gradient(-45deg,#2a2a3e 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#2a2a3e 75%),linear-gradient(-45deg,transparent 75%,#2a2a3e 75%);background-size:20px 20px;background-position:0 0,0 10px,10px -10px,-10px 0px;background-color:var(--bg-color)}.image-wrapper img{max-width:100%;max-height:400px;display:none;image-rendering:pixelated;image-rendering:-moz-crisp-edges;image-rendering:crisp-edges}.image-wrapper img.visible{display:block;cursor:pointer;transition:opacity .2s}.image-wrapper img.visible:hover{opacity:.9}.placeholder{color:var(--text-secondary);font-size:.9rem}.image-wrapper img.visible+.placeholder{display:none}.image-wrapper.dragover{outline:2px dashed var(--accent-color);outline-offset:-2px;background-color:var(--surface-hover)}.download-section{text-align:center}.download-section[hidden]{display:none}.history-section{margin-top:2rem;padding:1.5rem;background-color:var(--surface-color);border-radius:12px}.history-section[hidden]{display:none}.history-section h3{font-size:.9rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary);margin-bottom:1rem}.history-container{display:flex;gap:1rem;overflow-x:auto;padding-bottom:.5rem}.history-item{flex-shrink:0;display:flex;flex-direction:column;align-items:center;gap:.5rem;padding:.5rem;background-color:var(--bg-color);border-radius:8px;cursor:pointer;transition:all .2s;border:2px solid transparent}.history-item:hover{border-color:var(--border-color)}.history-item.selected{border-color:var(--accent-color)}.history-item img{width:80px;height:80px;object-fit:contain;image-rendering:pixelated;image-rendering:-moz-crisp-edges;image-rendering:crisp-edges;background-color:var(--surface-color);border-radius:4px}.history-item-info{font-size:.7rem;color:var(--text-secondary);text-align:center}.history-feature-badge{display:inline-block;padding:.1rem .3rem;font-size:.6rem;font-weight:700;border-radius:3px;background-color:var(--accent-color);color:#fff;margin-right:.25rem}.history-item[data-feature=bg-removal] .history-feature-badge{background-color:var(--bg-removal-color)}.history-item-actions{display:flex;gap:.25rem}.history-item-actions button{padding:.25rem .5rem;font-size:.7rem;border:none;border-radius:4px;cursor:pointer;background-color:var(--accent-color);color:#fff;transition:background-color .2s}.history-item-actions button:hover{background-color:var(--accent-hover)}footer{text-align:center;margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--border-color);color:var(--text-secondary);font-size:.9rem}footer a{color:var(--accent-color);text-decoration:none}footer a:hover{text-decoration:underline}.toast{position:fixed;bottom:2rem;left:50%;transform:translate(-50%);padding:1rem 1.5rem;border-radius:8px;display:flex;align-items:center;gap:1rem;box-shadow:var(--shadow);z-index:1000;animation:slideUp .3s ease}.toast[hidden]{display:none!important}.toast.error{background-color:var(--error-color);color:#fff}.toast-close{background:none;border:none;color:inherit;font-size:1.25rem;cursor:pointer;opacity:.8}.toast-close:hover{opacity:1}@keyframes slideUp{0%{opacity:0;transform:translate(-50%) translateY(1rem)}to{opacity:1;transform:translate(-50%) translateY(0)}}.fullscreen-viewer{position:fixed;top:0;left:0;width:100%;height:100%;z-index:2000;display:flex;align-items:center;justify-content:center}.fullscreen-viewer[hidden]{display:none!important}.fullscreen-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background-color:#000000f2;cursor:pointer}.fullscreen-content{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;gap:1rem;max-width:95vw;max-height:95vh}.fullscreen-content img{width:100vw;height:100vh;object-fit:contain;image-rendering:pixelated;image-rendering:-moz-crisp-edges;image-rendering:crisp-edges;cursor:pointer;border-radius:4px;box-shadow:0 8px 32px #00000080}.fullscreen-hint{color:var(--text-secondary);font-size:.85rem;opacity:.8}.fullscreen-close{position:absolute;top:1rem;right:1rem;background:var(--surface-color);border:none;color:var(--text-primary);font-size:2rem;width:48px;height:48px;border-radius:50%;cursor:pointer;z-index:2;display:flex;align-items:center;justify-content:center;transition:all .2s}.fullscreen-close:hover{background-color:var(--surface-hover);transform:scale(1.1)}@media (max-width: 600px){.container{padding:1rem}header h1{font-size:2rem}.feature-tabs{flex-direction:column}.tab-btn{width:100%}.dropzone{padding:2rem 1rem}.controls{flex-direction:column;align-items:stretch}.slider-container{max-width:none}.btn{width:100%}.fullscreen-close{top:.5rem;right:.5rem;width:40px;height:40px;font-size:1.5rem}}