@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(360deg)}}.btn,button{display:inline-block;padding:12px 24px;font-size:16px;font-weight:600;text-align:center;text-decoration:none;border:0;border-radius:8px;cursor:pointer;transition:all var(--transition-fast);font-family:inherit;line-height:1.5}.btn:disabled,button:disabled{opacity:.5;cursor:not-allowed}.btn-upload{background-color:var(--btn-upload);color:#fff}.btn-upload:hover:not(:disabled){background-color:var(--btn-upload-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-process{background-color:var(--btn-process);color:#fff}.btn-process:hover:not(:disabled){background-color:var(--btn-process-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-download{background-color:var(--btn-download);color:#fff}.btn-download:hover:not(:disabled){background-color:var(--btn-download-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-preview{background-color:var(--btn-preview);color:#fff}.btn-preview:hover:not(:disabled){background-color:var(--btn-preview-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-danger{background-color:var(--btn-danger);color:#fff}.btn-danger:hover:not(:disabled){background-color:var(--btn-danger-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-secondary{background-color:var(--bg-card);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover:not(:disabled){background-color:var(--bg-secondary);border-color:var(--border-color-hover)}.btn-ghost{background-color:transparent;color:var(--text-primary);border:1px solid var(--border-color)}.btn-ghost:hover:not(:disabled){background-color:var(--bg-card)}.btn-sm{padding:8px 16px;font-size:14px}.btn-lg{padding:16px 32px;font-size:18px}.btn-full{width:100%;display:block}.upload-area{border:2px dashed var(--border-color);border-radius:12px;padding:40px 20px;text-align:center;cursor:pointer;transition:all var(--transition-normal);background-color:var(--bg-secondary);min-height:300px;display:flex;flex-direction:column;align-items:center;justify-content:center}.upload-area:hover{border-color:var(--brand-primary);background-color:var(--bg-card);transform:translateY(-2px);box-shadow:var(--shadow-sm)}.upload-area:active{transform:translateY(0)}.upload-area.dragover{border-color:var(--brand-primary);background-color:var(--bg-card);transform:scale(1.02)}.upload-area input[type=file]{display:none}.upload-icon{font-size:48px;color:var(--text-muted);margin-bottom:16px}.step-content h4,.upload-text{font-size:18px;font-weight:600;color:var(--text-primary);margin-bottom:8px}.upload-subtext{font-size:14px;color:var(--text-muted)}.upload-browse-btn{margin-top:16px}.form-group{margin-bottom:20px}.form-label{display:block;font-size:14px;font-weight:600;color:var(--text-primary);margin-bottom:8px}.form-help{display:block;font-size:12px;color:var(--text-muted);margin-top:4px}input[type=email],input[type=number],input[type=text],select,textarea{width:100%;padding:10px 14px;font-size:15px;font-family:inherit;color:var(--text-primary);background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:6px;transition:all var(--transition-fast)}input:focus,select:focus,textarea:focus{outline:0;border-color:var(--border-color-focus);box-shadow:0 0 0 3px rgba(155,89,182,.1)}input:disabled,select:disabled,textarea:disabled{opacity:.6;cursor:not-allowed;background-color:var(--bg-secondary)}.range-group{margin-bottom:20px}.range-label{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.range-label-text,.range-value{font-size:14px;font-weight:600;color:var(--text-primary)}.range-value{font-weight:700;color:var(--brand-primary);background-color:var(--bg-card);padding:4px 10px;border-radius:4px;min-width:45px;text-align:center}input[type=range]{-webkit-appearance:none;width:100%;height:6px;background:var(--bg-secondary);border-radius:3px;outline:0;cursor:pointer;border:1px solid var(--border-color)}input[type=range]::-webkit-slider-runnable-track{width:100%;height:6px;background:var(--bg-secondary);border-radius:3px}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:16px;height:16px;background:var(--brand-primary);border-radius:50%;cursor:pointer;transition:all var(--transition-fast);border:2px solid var(--bg-primary);box-shadow:0 2px 4px rgba(0,0,0,.2);margin-top:-5px}input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.2);box-shadow:0 3px 8px rgba(155,89,182,.4)}input[type=range]::-moz-range-track{width:100%;height:6px;background:var(--bg-secondary);border-radius:3px;border:0}input[type=range]::-moz-range-thumb{width:16px;height:16px;background:var(--brand-primary);border-radius:50%;cursor:pointer;border:2px solid var(--bg-primary);box-shadow:0 2px 4px rgba(0,0,0,.2);transition:all var(--transition-fast)}input[type=range]::-moz-range-thumb:hover{transform:scale(1.2);box-shadow:0 3px 8px rgba(155,89,182,.4)}input[type=range]::-moz-range-progress{background:var(--brand-primary);height:6px;border-radius:3px 0 0 3px}.checkbox-group{display:flex;align-items:center;margin-bottom:16px}.toggle-switch{position:relative;display:inline-block;width:50px;height:26px;margin-right:12px}.toggle-switch input{opacity:0;width:0;height:0}.toggle-slider,.toggle-slider:before{position:absolute;transition:var(--transition-fast)}.toggle-slider{cursor:pointer;top:0;left:0;right:0;bottom:0;background-color:var(--bg-secondary);border:2px solid var(--border-color);border-radius:26px}.toggle-slider:before{content:"";height:18px;width:18px;left:2px;bottom:2px;background-color:var(--text-muted);border-radius:50%}input:checked+.toggle-slider{background-color:var(--brand-primary);border-color:var(--brand-primary)}input:checked+.toggle-slider:before{transform:translateX(24px);background-color:#fff}.toggle-label{font-size:14px;font-weight:500;color:var(--text-primary);cursor:pointer}.language-selector{position:relative}.language-btn,.language-dropdown{border:1px solid var(--border-color)}.language-btn{display:flex;align-items:center;gap:8px;padding:8px 14px;background-color:var(--bg-card);border-radius:6px;cursor:pointer;font-size:14px;font-weight:500;color:var(--text-primary);transition:all var(--transition-fast)}.language-btn:hover{background-color:var(--bg-secondary);border-color:var(--border-color-hover)}.language-btn .flag{font-size:18px;line-height:1}.language-dropdown{position:absolute;top:calc(100% + 8px);right:0;background-color:var(--bg-primary);border-radius:8px;box-shadow:var(--shadow-lg);min-width:200px;max-height:400px;overflow-y:auto;z-index:var(--z-dropdown);display:none}.language-dropdown.active{display:block}.language-option{display:flex;align-items:center;gap:10px;padding:10px 16px;cursor:pointer;transition:background-color var(--transition-fast);border-bottom:1px solid var(--border-color)}.language-option:last-child{border-bottom:none}.language-option:hover{background-color:var(--bg-secondary)}.language-option.selected{background-color:var(--brand-primary);color:#fff}.language-option .flag{font-size:20px}.language-option .name{font-size:14px;font-weight:500}.canvas-container{position:relative;width:100%;height:100%;display:flex;align-items:center;justify-content:center;flex:1;overflow:hidden;border-radius:8px}.canvas-container-with-bg{background-image:linear-gradient(45deg,var(--checker-dark) 25%,transparent 25%),linear-gradient(-45deg,var(--checker-dark) 25%,transparent 25%),linear-gradient(45deg,transparent 75%,var(--checker-dark) 75%),linear-gradient(-45deg,transparent 75%,var(--checker-dark) 75%);background-size:20px 20px;background-position:0 0,0 10px,10px -10px,-10px 0;background-color:var(--checker-light)}.canvas-container canvas,.canvas-container img{max-width:100%;max-height:100%;display:block;border-radius:4px;margin:auto;object-fit:contain}.size-indicator,.transparency-indicator{color:#fff;border-radius:6px;font-size:13px;font-weight:600}.transparency-indicator{display:flex;align-items:center;gap:8px;padding:8px 12px;background-color:var(--success);margin-top:12px}.transparency-indicator svg{width:16px;height:16px}.size-indicator{position:absolute;top:12px;left:12px;background-color:var(--info);padding:6px 12px;font-family:monospace;z-index:10;pointer-events:none}.spinner{border:3px solid var(--bg-secondary);border-top:3px solid var(--brand-primary);border-radius:50%;width:40px;height:40px;animation:spin 1s linear infinite}.loading-text{margin-top:16px;color:var(--text-secondary);font-weight:500}.alert{padding:16px 20px;border-radius:8px;margin-bottom:20px;display:flex;align-items:center;gap:12px;font-size:14px;font-weight:500}.alert-success{background-color:rgba(39,174,96,.1);color:var(--success);border:1px solid var(--success)}.alert-error{background-color:rgba(231,76,60,.1);color:var(--error);border:1px solid var(--error)}.alert-warning{background-color:rgba(243,156,18,.1);color:var(--warning);border:1px solid var(--warning)}.alert-info{background-color:rgba(52,152,219,.1);color:var(--info);border:1px solid var(--info)}.faq-item{background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:8px;margin-bottom:16px;overflow:hidden;transition:all var(--transition-fast)}.faq-item:hover{box-shadow:var(--shadow-sm)}.faq-question{padding:20px;cursor:pointer;font-weight:600;color:var(--text-primary);display:flex;justify-content:space-between;align-items:center;gap:16px;user-select:none}.faq-question:hover{background-color:var(--bg-secondary)}.faq-icon{flex-shrink:0;font-size:20px;transition:transform var(--transition-fast)}.faq-item.active .faq-icon{transform:rotate(180deg)}.faq-answer{max-height:0;overflow:hidden;transition:max-height var(--transition-normal)}.faq-item.active .faq-answer{max-height:500px}.faq-answer-content{padding:0 20px 20px;color:var(--text-secondary);line-height:1.6}.feature-box{background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:12px;padding:30px;text-align:center;transition:all var(--transition-normal)}[data-theme=dark] .feature-box{background-color:var(--feature-bg);color:var(--feature-text)}.feature-box:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.feature-icon{font-size:48px;margin-bottom:16px;display:block}.feature-title{font-size:20px;font-weight:600;margin-bottom:12px;color:var(--text-primary)}[data-theme=dark] .feature-title,[data-theme=dark] .step-content h4{color:var(--feature-text)}.feature-description,.step-content p{font-size:15px;color:var(--text-secondary);line-height:1.6}[data-theme=dark] .feature-description,[data-theme=dark] .step-content p{color:var(--feature-text);opacity:.8}.step-box{background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:12px;padding:24px;display:flex;align-items:flex-start;gap:16px;transition:all var(--transition-normal)}[data-theme=dark] .step-box{background-color:var(--feature-bg);color:var(--feature-text)}.step-box:hover{box-shadow:var(--shadow-md)}.step-number{flex-shrink:0;width:36px;height:36px;background-color:var(--brand-primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:18px}.step-content p{font-size:14px}@media (max-width:768px){.btn,button{padding:10px 20px;font-size:15px}.upload-area{padding:30px 15px;min-height:250px}.upload-icon{font-size:36px}.upload-text{font-size:16px}.feature-box{padding:20px}.feature-icon{font-size:36px}.step-box{padding:16px;flex-direction:column;text-align:center}.step-number{margin:0 auto}}@media (max-width:480px){.btn-full-mobile{width:100%;display:block}.upload-area{padding:20px 10px;min-height:200px}}