@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";:root{--bg-primary: #0a0a0f;--bg-secondary: #12121a;--bg-elevated: #1a1a25;--bg-glass: rgba(26, 26, 37, .8);--text-primary: #f0f0f5;--text-secondary: #9090a0;--text-muted: #606070;--accent-primary: #3b82f6;--accent-secondary: #8b5cf6;--accent-gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);--accent-glow: rgba(59, 130, 246, .3);--success: #22c55e;--warning: #f59e0b;--error: #ef4444;--border-subtle: rgba(255, 255, 255, .06);--border-default: rgba(255, 255, 255, .1);--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", "SF Mono", monospace;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 4px 16px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .5);--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .4s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);line-height:1.5;min-height:100vh}.app{min-height:100vh;display:flex;flex-direction:column}.app-header{padding:var(--space-lg) var(--space-xl);background:linear-gradient(180deg,var(--bg-secondary) 0%,transparent 100%);border-bottom:1px solid var(--border-subtle)}.logo{display:flex;align-items:center;gap:var(--space-md)}.logo svg{width:40px;height:40px;color:var(--accent-primary)}.logo h1{font-size:1.5rem;font-weight:600;background:var(--accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{color:var(--text-secondary);font-size:.875rem;margin-top:var(--space-xs);margin-left:56px}.app-main{flex:1;padding:var(--space-xl)}.workspace{max-width:1200px;margin:0 auto;display:flex;flex-direction:column;gap:var(--space-xl)}.app-footer{padding:var(--space-lg) var(--space-xl);text-align:center;color:var(--text-muted);font-size:.813rem;border-top:1px solid var(--border-subtle)}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-md)}section h2{font-size:1.125rem;font-weight:600;color:var(--text-primary)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-md);font-size:.875rem;font-weight:500;border:none;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.btn svg{width:18px;height:18px}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent-gradient);color:#fff;box-shadow:0 2px 12px var(--accent-glow)}.btn-primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 4px 20px var(--accent-glow)}.btn-secondary{background:var(--bg-elevated);color:var(--text-primary);border:1px solid var(--border-default)}.btn-secondary:hover:not(:disabled){background:var(--bg-glass);border-color:var(--accent-primary)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover:not(:disabled){background:var(--bg-elevated);color:var(--text-primary)}.btn-merge{width:100%;padding:var(--space-md) var(--space-lg);font-size:1rem;margin-top:var(--space-md)}.uploader{position:relative;padding:var(--space-2xl);border:2px dashed var(--border-default);border-radius:var(--radius-xl);background:var(--bg-secondary);text-align:center;cursor:pointer;transition:all var(--transition-normal)}.uploader:hover:not(.disabled){border-color:var(--accent-primary);background:var(--bg-elevated)}.uploader.drag-over{border-color:var(--accent-primary);background:#3b82f61a;transform:scale(1.01)}.uploader.disabled{opacity:.6;cursor:not-allowed}.uploader input[type=file]{position:absolute;top:0;right:0;bottom:0;left:0;opacity:0;cursor:inherit}.uploader-icon{margin-bottom:var(--space-md)}.uploader-icon svg{width:64px;height:64px;color:var(--text-muted);transition:color var(--transition-normal)}.uploader:hover .uploader-icon svg{color:var(--accent-primary)}.uploader-title{font-size:1.25rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--space-xs)}.uploader-subtitle{color:var(--text-secondary);font-size:.875rem}.uploader-formats{margin-top:var(--space-lg);font-size:.75rem;color:var(--text-muted)}.uploader-loading{display:flex;flex-direction:column;align-items:center;gap:var(--space-md)}.uploader-loading p{color:var(--text-secondary)}.spinner{width:40px;height:40px;border:3px solid var(--border-default);border-top-color:var(--accent-primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.image-preview{width:100%}.preview-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:var(--space-md)}.preview-item{background:var(--bg-secondary);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border-subtle);transition:all var(--transition-fast)}.preview-item:hover{border-color:var(--border-default);transform:translateY(-2px);box-shadow:var(--shadow-md)}.preview-thumbnail{position:relative;aspect-ratio:4/3;background:var(--bg-primary);overflow:hidden}.preview-thumbnail img{width:100%;height:100%;object-fit:cover}.preview-index{position:absolute;top:var(--space-sm);left:var(--space-sm);width:24px;height:24px;display:flex;align-items:center;justify-content:center;background:var(--bg-glass);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-radius:50%;font-size:.75rem;font-weight:600;color:var(--text-primary)}.preview-remove{position:absolute;top:var(--space-sm);right:var(--space-sm);width:28px;height:28px;display:flex;align-items:center;justify-content:center;background:#0009;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:none;border-radius:50%;cursor:pointer;opacity:0;transition:all var(--transition-fast)}.preview-item:hover .preview-remove{opacity:1}.preview-remove svg{width:14px;height:14px;color:var(--text-primary)}.preview-remove:hover{background:var(--error)}.preview-info{padding:var(--space-sm) var(--space-md)}.preview-name{display:block;font-size:.813rem;font-weight:500;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.preview-meta{display:block;font-size:.688rem;color:var(--text-muted);margin-top:2px}.preview-drag-handle{position:absolute;bottom:var(--space-sm);right:var(--space-sm);width:24px;height:24px;display:flex;align-items:center;justify-content:center;background:#00000080;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-radius:4px;cursor:grab;opacity:0;transition:all var(--transition-fast);color:var(--text-secondary)}.preview-item:hover .preview-drag-handle{opacity:1}.preview-drag-handle:active{cursor:grabbing}.preview-drag-handle svg{width:16px;height:16px}.preview-item.dragging{opacity:.5;transform:scale(.95)}.preview-item.drag-over{border-color:var(--accent-primary);background:var(--accent-primary-alpha);transform:translateY(-4px)}.preview-hint{text-align:center;font-size:.75rem;color:var(--text-muted);margin-top:var(--space-md)}.merge-settings{background:var(--bg-secondary);border-radius:var(--radius-lg);padding:var(--space-lg);border:1px solid var(--border-subtle)}.merge-settings.disabled{opacity:.6;pointer-events:none}.settings-group{margin-bottom:var(--space-lg)}.settings-group:last-child{margin-bottom:0}.settings-group h3{font-size:.875rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--space-xs)}.settings-description{font-size:.813rem;color:var(--text-muted);margin-bottom:var(--space-md)}.setting-item{margin-bottom:var(--space-md)}.setting-item:last-child{margin-bottom:0}.setting-item label{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-xs)}.setting-label{font-size:.875rem;color:var(--text-primary)}.setting-value{font-size:.813rem;font-family:var(--font-mono);color:var(--accent-primary)}.setting-hint{display:block;font-size:.75rem;color:var(--text-muted);margin-top:var(--space-xs)}input[type=range]{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:100%;height:6px;background:var(--bg-primary);border-radius:3px;cursor:pointer}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:18px;height:18px;background:var(--accent-gradient);border-radius:50%;cursor:pointer;box-shadow:0 2px 8px var(--accent-glow);transition:transform var(--transition-fast)}input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.1)}input[type=range]::-moz-range-thumb{width:18px;height:18px;background:var(--accent-gradient);border:none;border-radius:50%;cursor:pointer;box-shadow:0 2px 8px var(--accent-glow)}.setting-checkbox label{justify-content:flex-start;gap:var(--space-sm);cursor:pointer}input[type=checkbox]{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:20px;height:20px;background:var(--bg-primary);border:2px solid var(--border-default);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast)}input[type=checkbox]:checked{background:var(--accent-gradient);border-color:transparent}input[type=checkbox]:checked:after{content:"✓";display:flex;align-items:center;justify-content:center;width:100%;height:100%;font-size:12px;color:#fff}.merge-progress{background:var(--bg-secondary);border-radius:var(--radius-lg);padding:var(--space-lg);border:1px solid var(--border-subtle)}.progress-bar-container{height:8px;background:var(--bg-primary);border-radius:4px;overflow:hidden;margin-bottom:var(--space-md)}.progress-bar-fill{height:100%;background:var(--accent-gradient);border-radius:4px;transition:width var(--transition-normal);box-shadow:0 0 20px var(--accent-glow)}.progress-info{display:flex;justify-content:space-between;align-items:center}.progress-stage{font-size:.875rem;color:var(--text-secondary)}.progress-percent{font-size:.875rem;font-weight:600;font-family:var(--font-mono);color:var(--accent-primary)}.result-viewer{background:var(--bg-secondary);border-radius:var(--radius-lg);padding:var(--space-lg);border:1px solid var(--border-subtle)}.result-preview{background:var(--bg-primary);border-radius:var(--radius-md);overflow:hidden;margin-bottom:var(--space-md)}.result-canvas{width:100%;height:auto;display:block}.result-info{text-align:center;margin-bottom:var(--space-md)}.result-dimensions{font-size:.813rem;color:var(--text-muted);font-family:var(--font-mono)}.result-actions{display:flex;gap:var(--space-sm);flex-wrap:wrap}.result-actions .btn{flex:1;min-width:120px}@media(max-width:768px){.app-header,.app-main{padding:var(--space-md)}.uploader{padding:var(--space-lg)}.preview-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}.result-actions{flex-direction:column}.result-actions .btn{width:100%}}