:root{--primary-color:#41907c;--primary-hover:#367a68;--primary-light:#e8f5f3;--success-color:#28a745;--error-color:#dc3545;--warning-color:#ffc107;--info-color:#17a2b8;--text-primary:#333;--text-secondary:#666;--text-muted:#999;--border-color:#f0f0f0;--bg-light:#f8f9fa;--bg-white:#fff;--spacing-xs:4px;--spacing-sm:8px;--spacing-md:16px;--spacing-lg:24px;--spacing-xl:32px;--border-radius-sm:4px;--border-radius-md:8px;--border-radius-lg:12px;--shadow-sm:0 1px 3px rgba(0,0,0,0.1);--shadow-md:0 4px 6px rgba(0,0,0,0.1);--shadow-lg:0 10px 15px rgba(0,0,0,0.1);--transition-fast:0.15s ease;--transition-normal:0.3s ease;--transition-slow:0.5s ease}.background-remove .model-loading{background:#f8f9fa;border:1px solid #e9ecef;border-radius:8px;padding:20px;margin-bottom:20px;text-align:center}.background-remove .model-loading .loading-content{display:flex;flex-direction:column;align-items:center;gap:12px}.background-remove .model-loading .loading-content .spinner{width:32px;height:32px;border:3px solid #f3f3f3;border-top:3px solid var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}.background-remove .model-loading .loading-content p{margin:0;color:#666;font-size:14px}.background-remove .result-container{position:relative;display:inline-block}.background-remove .result-canvas{max-width:100%;height:auto;border:1px solid #ddd;border-radius:4px;background:linear-gradient(45deg,#f0f0f0 25%,transparent 0),linear-gradient(-45deg,#f0f0f0 25%,transparent 0),linear-gradient(45deg,transparent 75%,#f0f0f0 0),linear-gradient(-45deg,transparent 75%,#f0f0f0 0);background-size:20px 20px;background-position:0 0,0 10px,10px -10px,-10px 0}.background-remove .processing-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(255,255,255,.9);display:flex;align-items:center;justify-content:center;border-radius:4px}.background-remove .processing-content{text-align:center}.background-remove .processing-content .processing-spinner{width:32px;height:32px;border:3px solid #f3f3f3;border-top:3px solid var(--primary-color);border-radius:50%;animation:spin 1s linear infinite;margin:0 auto 10px}.background-remove .processing-content p{margin:0;color:#666;font-size:14px;font-weight:500}.background-remove .actions{display:flex;flex-direction:column;justify-content:center;padding:20px;border-top:1px solid #e5e7eb;margin-top:20px}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}@media screen and (max-width:768px){.background-remove .model-loading{padding:15px;margin-bottom:15px}.background-remove .model-loading .loading-content{gap:10px}.background-remove .model-loading .loading-content .spinner{width:28px;height:28px}.background-remove .model-loading .loading-content p{font-size:13px}.background-remove .result-canvas{max-width:calc(100vw - 60px);max-height:60vh;object-fit:contain}.background-remove .processing-overlay .processing-content .processing-spinner{width:28px;height:28px}.background-remove .processing-overlay .processing-content p{font-size:13px}.background-remove .actions{padding:15px}}@media screen and (max-width:480px){.background-remove .result-canvas{max-width:calc(100vw - 40px);max-height:50vh}.background-remove .actions,.background-remove .model-loading{padding:10px}}.device-switch{margin-top:1rem;padding:1rem;border:1px solid #e0e0e0;border-radius:8px;background:#f8f9fa}.device-switch .device-info{margin-bottom:.75rem}.device-switch .device-info .current-device{font-weight:600;color:#495057;display:block;margin-bottom:.25rem}.device-switch .device-info .device-hint{font-size:.875rem;color:#6c757d;line-height:1.4}.device-switch .btn{min-width:120px}