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svg{width:24px;height:24px}.instruction-content h4{font-size:1rem;font-weight:500;margin-bottom:var(--spacing-xs)}.instruction-content p{font-size:.875rem;color:var(--text-secondary)}.footer{text-align:center;padding:var(--spacing-2xl) var(--spacing-lg)}.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:var(--spacing-lg);margin-bottom:var(--spacing-lg)}.footer-links a{color:var(--text-secondary);text-decoration:none;font-size:1rem;transition:color var(--transition-fast)}.footer-links a:hover{color:var(--text-primary)}.footer-copyright{color:var(--text-secondary);font-size:1rem}.spinner{display:inline-block;width:24px;height:24px;border:3px solid var(--bg-tertiary);border-top-color:var(--accent-primary);border-radius:50%;animation:spin .8s linear infinite}.spinner-large{width:48px;height:48px;border-width:4px}@keyframes spin{to{transform:rotate(360deg)}}.loading-overlay{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-md);padding:var(--spacing-2xl)}.loading-text{color:var(--text-secondary);font-size:.875rem}.error-message{display:flex;align-items:flex-start;gap:var(--spacing-md);padding:var(--spacing-md);background-color:#ef44441a;border:1px solid var(--error);border-radius:var(--radius-lg);color:var(--error);margin:var(--spacing-md)}.error-message svg{flex-shrink:0;width:20px;height:20px}.error-message p{font-size:.875rem}.error-dismiss{margin-left:auto;background:none;border:none;color:var(--error);cursor:pointer;padding:var(--spacing-xs)}.success-message{display:flex;align-items:center;gap:var(--spacing-sm);color:var(--success);font-size:.875rem;padding:var(--spacing-sm)}@media(max-width:768px){.header{padding:var(--spacing-md);flex-wrap:wrap;gap:var(--spacing-md)}.header-actions,.header-nav{gap:var(--spacing-md)}.main-content{padding:var(--spacing-md)}.page-title{font-size:1.5rem}.upload-area{padding:var(--spacing-xl) var(--spacing-md)}}.katex-display{margin:0}.katex{color:var(--text-primary)}.image-editor-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#000c;display:flex;align-items:center;justify-content:center;z-index:1000;padding:var(--spacing-md)}.image-editor-modal{background-color:var(--bg-secondary);border-radius:var(--radius-lg);width:100%;max-width:600px;max-height:90vh;display:flex;flex-direction:column;overflow:hidden;box-shadow:0 25px 50px -12px #00000080}.image-editor-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md) var(--spacing-lg);border-bottom:1px solid var(--border-color)}.image-editor-header h3{font-size:1.125rem;font-weight:600;margin:0}.image-editor-close{background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:var(--spacing-xs);border-radius:var(--radius-sm);transition:all var(--transition-fast)}.image-editor-close:hover{color:var(--text-primary);background-color:var(--bg-tertiary)}.image-editor-cropper{position:relative;flex:1;min-height:200px;max-height:60vh;background-color:var(--bg-primary);display:flex;align-items:center;justify-content:center;padding:var(--spacing-md);overflow:auto;-webkit-overflow-scrolling:touch}.image-editor-cropper::-webkit-scrollbar{width:14px;height:14px}.image-editor-cropper::-webkit-scrollbar-track{background:var(--bg-tertiary);border-radius:7px}.image-editor-cropper::-webkit-scrollbar-thumb{background-color:var(--accent-primary);border-radius:7px;border:3px solid var(--bg-tertiary)}.image-editor-cropper::-webkit-scrollbar-thumb:hover{background-color:#2563eb}.image-editor-cropper{scrollbar-width:auto;scrollbar-color:var(--accent-primary) var(--bg-tertiary)}.ReactCrop{max-width:100%;max-height:100%}.ReactCrop__image{max-width:100%;max-height:100%;object-fit:contain}.ReactCrop__crop-selection{border:2px solid var(--accent-primary)!important}.ReactCrop__drag-handle{width:12px!important;height:12px!important;background-color:var(--accent-primary)!important;border:2px solid white!important}.image-editor-controls{padding:var(--spacing-lg);display:flex;flex-direction:column;gap:var(--spacing-lg);border-bottom:1px solid var(--border-color)}.editor-control-group{display:flex;flex-direction:column;gap:var(--spacing-sm);align-items:center}.editor-control-group label{font-size:.875rem;font-weight:500;color:var(--text-secondary)}.rotation-buttons,.zoom-buttons{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm)}.btn-editor{display:flex;align-items:center;justify-content:center;width:44px;height:44px;background-color:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast);flex-shrink:0}.btn-editor:hover{background-color:var(--border-color)}.btn-editor:active{transform:scale(.95)}.rotation-slider,.zoom-slider{flex:1;height:8px;-webkit-appearance:none;-moz-appearance:none;appearance:none;background:var(--bg-tertiary);border-radius:4px;outline:none}.rotation-slider::-webkit-slider-thumb,.zoom-slider::-webkit-slider-thumb{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:20px;height:20px;background:var(--accent-primary);border-radius:50%;cursor:pointer;transition:transform var(--transition-fast)}.rotation-slider::-webkit-slider-thumb:hover,.zoom-slider::-webkit-slider-thumb:hover{transform:scale(1.2)}.rotation-slider::-moz-range-thumb,.zoom-slider::-moz-range-thumb{width:20px;height:20px;background:var(--accent-primary);border-radius:50%;cursor:pointer;border:none}.rotation-value,.zoom-value{font-size:.875rem;color:var(--text-secondary);min-width:50px;text-align:right}.image-editor-actions{display:flex;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-lg);justify-content:flex-end}.btn-secondary{background-color:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover{background-color:var(--border-color)}.btn-secondary:disabled{opacity:.5;cursor:not-allowed}.crop-scroll-container{overflow:auto;max-width:100%;max-height:100%;display:flex;align-items:center;justify-content:center}.crop-container{position:relative;flex-shrink:0}.crop-box-border{position:absolute;box-sizing:border-box;cursor:move}.crop-handle{position:absolute;background:#fff;border:2px solid var(--accent-primary);z-index:100;box-shadow:0 2px 4px #0000004d}.crop-handle.corner{width:16px;height:16px;border-radius:2px}.crop-handle.corner.nw{cursor:nw-resize}.crop-handle.corner.ne{cursor:ne-resize}.crop-handle.corner.sw{cursor:sw-resize}.crop-handle.corner.se{cursor:se-resize}.crop-handle.side{border-radius:4px}.crop-handle.side.n,.crop-handle.side.s{width:40px;height:8px;cursor:ns-resize}.crop-handle.side.e,.crop-handle.side.w{width:8px;height:40px;cursor:ew-resize}.crop-info{display:flex;justify-content:center;align-items:center;gap:var(--spacing-md);padding:var(--spacing-sm);font-size:.875rem;color:var(--text-secondary)}.crop-error{color:var(--error);font-weight:500}.edit-image-btn{position:absolute;top:-8px;left:-8px;width:32px;height:32px;display:flex;align-items:center;justify-content:center;background-color:var(--accent-primary);color:#fff;border:none;border-radius:50%;cursor:pointer;transition:all var(--transition-fast);z-index:10;box-shadow:0 2px 8px #0000004d}.edit-image-btn:hover{background-color:var(--accent-hover);transform:scale(1.1)}.edit-image-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.edit-image-btn svg{width:16px;height:16px}@media(max-width:768px){.image-editor-modal{max-height:95vh;margin:var(--spacing-sm)}.image-editor-cropper{height:250px}.btn-editor{width:48px;height:48px}.rotation-slider::-webkit-slider-thumb,.zoom-slider::-webkit-slider-thumb{width:24px;height:24px}.image-editor-actions{flex-direction:column}.image-editor-actions .btn{width:100%;padding:var(--spacing-md)}}.header-nav a.active{color:var(--accent-primary);font-weight:600}.about-page{width:100%;max-width:1000px;margin:0 auto;padding:0 var(--spacing-md)}.about-hero{text-align:center;padding:var(--spacing-2xl) 0}.about-hero-title{font-size:3.5rem;font-weight:800;letter-spacing:-.02em;margin-bottom:var(--spacing-lg);background:linear-gradient(135deg,var(--accent-primary) 0%,#8b5cf6 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.about-hero-description{font-size:1.125rem;color:var(--text-secondary);max-width:700px;margin:0 auto var(--spacing-xl);line-height:1.7}.about-hero-problem{font-size:1rem;color:var(--text-muted);max-width:700px;margin:var(--spacing-xl) auto 0;line-height:1.6}.about-stats{display:flex;justify-content:center;gap:var(--spacing-xl);margin:var(--spacing-xl) 0;flex-wrap:wrap}.about-stat{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-lg) var(--spacing-xl);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);min-width:180px;transition:all var(--transition-fast)}.about-stat:hover{transform:translateY(-4px);box-shadow:0 12px 24px #00000026;border-color:var(--accent-primary)}.about-stat-number{font-size:2.5rem;font-weight:800;color:var(--accent-primary);line-height:1}.about-stat-label{font-size:.875rem;color:var(--text-secondary);text-align:center;line-height:1.4}.about-stats-row{display:flex;justify-content:center;gap:var(--spacing-2xl);margin:var(--spacing-xl) 0;flex-wrap:wrap}.stat-item{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-lg);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);min-width:200px;transition:all var(--transition-fast)}.stat-item:hover{transform:translateY(-4px);box-shadow:0 12px 24px #00000026}.stat-item-accent{border-color:var(--accent-primary);background:#3b82f614}.stat-number{font-size:2.5rem;font-weight:800;color:var(--accent-primary)}.stat-label{font-size:.875rem;color:var(--text-secondary);text-align:center;max-width:140px}.about-section{padding:var(--spacing-2xl) 0;border-top:1px solid var(--border-color)}.about-section-title{font-size:1.75rem;font-weight:700;margin-bottom:var(--spacing-lg);text-align:center}.about-section-text{font-size:1.0625rem;color:var(--text-secondary);max-width:700px;margin:0 auto var(--spacing-lg);line-height:1.7;text-align:center}.about-section-text-secondary{font-size:.9375rem;color:var(--text-muted);max-width:600px;margin:var(--spacing-lg) auto 0;line-height:1.6;text-align:center}.animation-container{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--spacing-lg);margin:var(--spacing-xl) 0;overflow:hidden}.audience-list{list-style:none;max-width:600px;margin:0 auto}.audience-list li{display:flex;align-items:flex-start;gap:var(--spacing-md);padding:var(--spacing-md) 0;border-bottom:1px solid var(--border-color)}.audience-list li:last-child{border-bottom:none}.audience-list li svg{flex-shrink:0;color:var(--accent-primary);margin-top:2px}.audience-list li span{color:var(--text-secondary);line-height:1.5}.benefits-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-lg);margin-top:var(--spacing-xl)}.benefit-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--spacing-xl);text-align:center;transition:all var(--transition-normal)}.benefit-card:hover{border-color:var(--accent-primary);transform:translateY(-4px);box-shadow:0 12px 24px #00000026}.benefit-icon{width:64px;height:64px;display:flex;align-items:center;justify-content:center;margin:0 auto var(--spacing-md);background:#3b82f61a;border-radius:50%;color:var(--accent-primary)}.benefit-card h3{font-size:1.125rem;font-weight:600;margin-bottom:var(--spacing-sm)}.benefit-card p{font-size:.875rem;color:var(--text-secondary);line-height:1.5}.about-cta{text-align:center;padding:var(--spacing-2xl) 0 var(--spacing-xl)}.btn-large{padding:.875rem 2rem;font-size:1rem}@media(max-width:768px){.about-hero-title{font-size:2.5rem}.about-hero-description{font-size:1rem}.about-stats-row{flex-direction:column;align-items:center;gap:var(--spacing-md)}.stat-item{width:100%;max-width:280px}.benefits-grid{grid-template-columns:1fr}.about-section-title{font-size:1.5rem}.about-section-text{font-size:1rem}}.technology-page{width:100%;max-width:1000px;margin:0 auto;padding:0 var(--spacing-md)}.tech-hero{text-align:center;padding:var(--spacing-2xl) 0}.tech-hero-title{font-size:3.5rem;font-weight:800;letter-spacing:-.02em;margin-bottom:var(--spacing-lg);background:linear-gradient(135deg,var(--accent-primary) 0%,#8b5cf6 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.tech-hero-subtitle{font-size:1.25rem;color:var(--text-secondary);font-weight:400}.tech-section{padding:var(--spacing-2xl) 0;border-top:1px solid var(--border-color)}.tech-section-header{display:flex;align-items:center;gap:var(--spacing-md);margin-bottom:var(--spacing-xl);flex-wrap:wrap}.tech-section-number{font-size:.875rem;font-weight:700;color:var(--accent-primary);background:#3b82f61a;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-sm)}.tech-section-title{font-size:1.75rem;font-weight:700;margin:0}.tech-section-tag{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);background:var(--bg-tertiary);padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-sm)}.tech-animation-container{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--spacing-lg);margin-bottom:var(--spacing-xl);overflow:hidden}.tech-animation-container.dark{background:#1e272e;border-color:#34495e}.tech-section-content{width:100%}.tech-section-content p{font-size:1.0625rem;color:var(--text-secondary);line-height:1.7;margin-bottom:var(--spacing-md)}.tech-section-content a{color:var(--accent-primary);text-decoration:none;font-weight:500;transition:color var(--transition-fast)}.tech-section-content a:hover{color:var(--accent-hover);text-decoration:underline}.tech-section-content a svg{display:inline;vertical-align:middle;margin-left:2px}.tech-highlight{background:var(--bg-tertiary);border-left:4px solid var(--accent-primary);padding:var(--spacing-md) var(--spacing-lg);border-radius:0 var(--radius-md) var(--radius-md) 0;margin:var(--spacing-lg) 0}.tech-stats{display:flex;align-items:center;justify-content:center;gap:var(--spacing-lg);margin:var(--spacing-xl) 0;flex-wrap:wrap}.tech-stat{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-lg);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);min-width:140px}.tech-stat.muted{opacity:.5}.tech-stat-number{font-size:2rem;font-weight:800;color:#2ecc71}.tech-stat.muted .tech-stat-number{color:var(--text-muted)}.tech-stat-label{font-size:.75rem;color:var(--text-secondary);text-align:center}.tech-stat-divider{font-size:1.25rem;font-weight:600;color:var(--text-muted)}.tech-section-accordion{border:1px solid var(--border-color);border-radius:var(--radius-lg);overflow:hidden}.accordion-header{width:100%;display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-lg) var(--spacing-xl);background:var(--bg-secondary);border:none;cursor:pointer;transition:all var(--transition-fast)}.accordion-header:hover{background:var(--bg-tertiary)}.accordion-header.open{border-bottom:1px solid var(--border-color)}.accordion-header-content{display:flex;align-items:center;gap:var(--spacing-md)}.accordion-header-content .tech-section-title{font-size:1.25rem}.accordion-chevron{color:var(--text-secondary);transition:transform var(--transition-normal)}.accordion-chevron.open{transform:rotate(180deg)}.accordion-content{max-height:0;overflow:hidden;transition:max-height .3s ease-out}.accordion-content.open{max-height:1000px}.accordion-inner{padding:var(--spacing-xl)}.accordion-inner h3{font-size:1.25rem;font-weight:600;margin-bottom:var(--spacing-md)}.accordion-inner p{font-size:.9375rem;color:var(--text-secondary);line-height:1.7;margin-bottom:var(--spacing-md)}.accordion-inner a{color:var(--accent-primary);text-decoration:none;font-weight:500}.accordion-inner a:hover{text-decoration:underline}.accordion-inner a svg{display:inline;vertical-align:middle;margin-left:2px}.tech-detail-box{background:var(--bg-tertiary);border-radius:var(--radius-lg);padding:var(--spacing-lg);margin-bottom:var(--spacing-lg)}.tech-detail-box h4{font-size:1rem;font-weight:600;margin-bottom:var(--spacing-sm);color:var(--text-primary)}.tech-detail-box p{margin-bottom:var(--spacing-sm)}.tech-detail-box p:last-child{margin-bottom:0}.tech-note{font-size:.875rem!important;font-style:italic;color:var(--text-muted)!important}.tech-advantage{background:#2ecc711a;border:1px solid rgba(46,204,113,.3);border-radius:var(--radius-lg);padding:var(--spacing-lg)}.tech-advantage p{margin-bottom:0;color:var(--text-primary)!important}.tech-cta{text-align:center;padding:var(--spacing-2xl) 0 var(--spacing-xl)}@media(max-width:768px){.tech-hero-title{font-size:2.5rem}.tech-hero-subtitle{font-size:1rem}.tech-section-header{flex-direction:column;align-items:flex-start}.tech-section-title{font-size:1.5rem}.tech-stats{flex-direction:column;align-items:stretch}.tech-stat{width:100%}.tech-stat-divider{text-align:center}.accordion-header,.accordion-inner{padding:var(--spacing-md)}}.user-manual-page{width:100%;max-width:900px;padding:var(--spacing-lg)}.manual-hero{text-align:center;margin-bottom:var(--spacing-2xl)}.manual-hero-title{font-size:2.5rem;font-weight:700;margin-bottom:var(--spacing-md);background:linear-gradient(135deg,var(--accent-primary),#60a5fa);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.manual-hero-subtitle{font-size:1.125rem;color:var(--text-secondary);max-width:600px;margin:0 auto}.manual-sections{display:flex;flex-direction:column;gap:var(--spacing-md)}.manual-section{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);overflow:hidden;transition:all var(--transition-normal)}.manual-section.open{box-shadow:0 4px 20px #0000001a}.manual-section-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-lg);background:none;border:none;width:100%;cursor:pointer;transition:background-color var(--transition-fast)}.manual-section-header:hover{background-color:var(--bg-tertiary)}.manual-section-title-wrapper{display:flex;align-items:center;gap:var(--spacing-md)}.manual-section-icon{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background-color:var(--bg-tertiary);border-radius:var(--radius-md);color:var(--accent-primary)}.manual-section-title{font-size:1.125rem;font-weight:600;color:var(--text-primary);margin:0}.manual-chevron{color:var(--text-secondary);transition:transform var(--transition-normal)}.manual-chevron.open{transform:rotate(180deg)}.manual-section-content{max-height:0;overflow:hidden;transition:max-height .3s ease-out}.manual-section-content.open{max-height:1000px}.manual-section-inner{padding:0 var(--spacing-lg) var(--spacing-lg)}.manual-content p{color:var(--text-secondary);line-height:1.7;margin-bottom:var(--spacing-md)}.manual-steps{display:flex;flex-direction:column;gap:var(--spacing-sm);margin:var(--spacing-md) 0}.manual-step{display:flex;align-items:flex-start;gap:var(--spacing-md);padding:var(--spacing-sm) 0}.step-number{width:28px;height:28px;display:flex;align-items:center;justify-content:center;background-color:var(--accent-primary);color:#fff;font-size:.875rem;font-weight:700;border-radius:50%;flex-shrink:0}.manual-step p{margin:0;padding-top:2px}.manual-tip{background-color:var(--bg-tertiary);border-left:3px solid var(--accent-primary);padding:var(--spacing-md);border-radius:0 var(--radius-md) var(--radius-md) 0;margin-top:var(--spacing-md)}.manual-tip strong{color:var(--text-primary)}.manual-features h4,.manual-formats h4{font-size:.9375rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--spacing-sm)}.manual-features ul{list-style:none;padding:0;margin:0}.manual-features li{position:relative;padding-left:var(--spacing-lg);color:var(--text-secondary);margin-bottom:var(--spacing-sm)}.manual-features li:before{content:"•";position:absolute;left:0;color:var(--accent-primary);font-weight:700}.format-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-sm);margin-top:var(--spacing-sm)}.format-item{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);background-color:var(--bg-tertiary);border-radius:var(--radius-md)}.format-item code{background-color:var(--bg-primary);padding:2px 6px;border-radius:var(--radius-sm);font-size:.75rem;color:var(--accent-primary)}.format-item span{font-size:.8125rem;color:var(--text-secondary)}.manual-cta{text-align:center;padding:var(--spacing-2xl) 0 var(--spacing-xl)}.cta-buttons{display:flex;gap:var(--spacing-md);justify-content:center;flex-wrap:wrap}@media(max-width:768px){.manual-hero-title{font-size:2rem}.manual-section-header{padding:var(--spacing-md)}.manual-section-inner{padding:0 var(--spacing-md) var(--spacing-md)}.format-grid{grid-template-columns:1fr}}