:root{--color-primary: #6366f1;--color-primary-hover: #4f46e5;--color-primary-light: rgba(99, 102, 241, .1);--color-success: #10b981;--color-danger: #ef4444;--color-warning: #f59e0b;--color-bg: #f8fafc;--color-bg-secondary: #ffffff;--color-bg-tertiary: #f1f5f9;--color-text: #0f172a;--color-text-secondary: #64748b;--color-text-muted: #94a3b8;--color-border: #e2e8f0;--color-border-hover: #cbd5e1;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -2px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -4px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 8px 10px -6px rgba(0, 0, 0, .1);--glass-bg: rgba(255, 255, 255, .7);--glass-border: rgba(255, 255, 255, .3);--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-2xl: 1.5rem;--radius-full: 9999px;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .35s ease;--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 1.875rem}[data-theme=dark]{--color-primary: #818cf8;--color-primary-hover: #a5b4fc;--color-primary-light: rgba(129, 140, 248, .15);--color-bg: #0f172a;--color-bg-secondary: #1e293b;--color-bg-tertiary: #334155;--color-text: #f1f5f9;--color-text-secondary: #94a3b8;--color-text-muted: #64748b;--color-border: #334155;--color-border-hover: #475569;--glass-bg: rgba(30, 41, 59, .8);--glass-border: rgba(51, 65, 85, .5);--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4), 0 2px 4px -2px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .4), 0 4px 6px -4px rgba(0, 0, 0, .3)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-family);font-size:var(--font-size-base);line-height:1.6;color:var(--color-text);background:var(--color-bg);min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#app{min-height:100vh;display:flex;flex-direction:column}.header{background:var(--glass-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--color-border);position:sticky;top:0;z-index:100}.header-content{max-width:1200px;margin:0 auto;padding:var(--spacing-md) var(--spacing-lg);display:flex;align-items:center;justify-content:space-between}.logo{display:flex;align-items:center;gap:var(--spacing-sm);text-decoration:none;color:var(--color-text)}.logo-icon{width:32px;height:32px;color:var(--color-primary)}.logo-text{font-size:var(--font-size-xl);font-weight:700;background:linear-gradient(135deg,var(--color-primary),#a855f7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.header-actions{display:flex;align-items:center;gap:var(--spacing-sm)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-lg);font-family:inherit;font-size:var(--font-size-sm);font-weight:500;line-height:1.5;border:none;border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-fast);text-decoration:none}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:linear-gradient(135deg,var(--color-primary),#8b5cf6);color:#fff;box-shadow:0 4px 14px #6366f166}.btn-primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 6px 20px #6366f180}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-secondary{background:var(--color-bg-tertiary);color:var(--color-text);border:1px solid var(--color-border)}.btn-secondary:hover:not(:disabled){background:var(--color-border);border-color:var(--color-border-hover)}.btn-sm{padding:var(--spacing-xs) var(--spacing-md);font-size:var(--font-size-xs)}.btn-lg{padding:var(--spacing-md) var(--spacing-xl);font-size:var(--font-size-base)}.btn-icon{width:18px;height:18px;flex-shrink:0}.icon-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border:none;border-radius:var(--radius-lg);background:var(--color-bg-tertiary);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast)}.icon-btn:hover{background:var(--color-border);color:var(--color-text)}.icon-btn.danger:hover{background:#ef44441a;color:var(--color-danger)}.icon-btn .icon{width:20px;height:20px}#themeToggle .moon-icon,[data-theme=dark] #themeToggle .sun-icon{display:none}[data-theme=dark] #themeToggle .moon-icon{display:block}.main{flex:1;padding:var(--spacing-xl) var(--spacing-lg)}.container{max-width:900px;margin:0 auto}.drop-zone{background:var(--color-bg-secondary);border:2px dashed var(--color-border);border-radius:var(--radius-2xl);padding:var(--spacing-2xl);text-align:center;transition:all var(--transition-normal);cursor:pointer}.drop-zone:hover,.drop-zone.dragover{border-color:var(--color-primary);background:var(--color-primary-light)}.drop-zone.dragover{transform:scale(1.01)}.drop-zone-content{pointer-events:none}.drop-zone-content .btn{pointer-events:auto}.drop-zone-icon{width:80px;height:80px;margin:0 auto var(--spacing-lg);color:var(--color-text-muted)}.drop-zone-icon svg{width:100%;height:100%}.drop-zone-title{font-size:var(--font-size-xl);font-weight:600;color:var(--color-text);margin-bottom:var(--spacing-xs)}.drop-zone-subtitle{color:var(--color-text-secondary);margin-bottom:var(--spacing-lg)}.drop-zone-hint{font-size:var(--font-size-xs);color:var(--color-text-muted);margin-top:var(--spacing-lg)}.file-info{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--spacing-lg);margin-bottom:var(--spacing-lg);animation:slideIn .3s ease}@keyframes slideIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.file-info-header{display:flex;align-items:center;gap:var(--spacing-md)}.file-icon{width:48px;height:48px;background:var(--color-primary-light);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;color:var(--color-primary);flex-shrink:0}.file-icon svg{width:24px;height:24px}.file-details{flex:1;min-width:0}.file-name{font-size:var(--font-size-base);font-weight:600;color:var(--color-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-meta{font-size:var(--font-size-sm);color:var(--color-text-secondary)}.page-grid{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--spacing-lg);margin-bottom:var(--spacing-lg);animation:slideIn .3s ease}.page-grid-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--spacing-lg);flex-wrap:wrap;gap:var(--spacing-md)}.page-grid-actions{display:flex;gap:var(--spacing-sm)}.selected-count{font-size:var(--font-size-sm);color:var(--color-text-secondary)}.thumbnails{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:var(--spacing-md)}.thumbnail{position:relative;aspect-ratio:3/4;background:var(--color-bg-tertiary);border:2px solid transparent;border-radius:var(--radius-lg);overflow:hidden;cursor:pointer;transition:all var(--transition-fast)}.thumbnail:hover{border-color:var(--color-border-hover);transform:translateY(-2px);box-shadow:var(--shadow-md)}.thumbnail.selected{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.thumbnail canvas{width:100%;height:100%;object-fit:contain}.thumbnail-page{position:absolute;bottom:var(--spacing-xs);right:var(--spacing-xs);background:#000000b3;color:#fff;font-size:var(--font-size-xs);padding:2px 6px;border-radius:var(--radius-sm)}.thumbnail-checkbox{position:absolute;top:var(--spacing-xs);left:var(--spacing-xs);width:22px;height:22px;background:#ffffffe6;border:2px solid var(--color-border);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.thumbnail.selected .thumbnail-checkbox{background:var(--color-primary);border-color:var(--color-primary)}.thumbnail-checkbox svg{width:14px;height:14px;color:#fff;opacity:0;transition:opacity var(--transition-fast)}.thumbnail.selected .thumbnail-checkbox svg{opacity:1}.settings{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--spacing-lg);margin-bottom:var(--spacing-lg);animation:slideIn .3s ease}.settings-title{font-size:var(--font-size-lg);font-weight:600;color:var(--color-text);margin-bottom:var(--spacing-lg)}.setting-group{margin-bottom:var(--spacing-lg)}.setting-group:last-of-type{margin-bottom:var(--spacing-xl)}.setting-label{display:block;font-size:var(--font-size-sm);font-weight:500;color:var(--color-text-secondary);margin-bottom:var(--spacing-sm)}.radio-group{display:flex;flex-wrap:wrap;gap:var(--spacing-md)}.radio-item{display:flex;align-items:center;gap:var(--spacing-sm);cursor:pointer;font-size:var(--font-size-sm);color:var(--color-text)}.radio-item input{display:none}.radio-box{width:18px;height:18px;border:2px solid var(--color-border);border-radius:var(--radius-full);position:relative;transition:all var(--transition-fast)}.radio-item input:checked+.radio-box{border-color:var(--color-primary)}.radio-box:after{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:8px;height:8px;background:var(--color-primary);border-radius:var(--radius-full);transition:transform var(--transition-fast)}.radio-item input:checked+.radio-box:after{transform:translate(-50%,-50%) scale(1)}.stitch-options{background:var(--color-bg-tertiary);border-radius:var(--radius-lg);padding:var(--spacing-lg);margin-top:var(--spacing-md);animation:slideIn .2s ease}.range-slider{width:100%;height:6px;background:var(--color-border);border-radius:var(--radius-full);appearance:none;-webkit-appearance:none;cursor:pointer}.range-slider::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:18px;height:18px;background:var(--color-primary);border-radius:var(--radius-full);cursor:pointer;box-shadow:var(--shadow-md);transition:transform var(--transition-fast)}.range-slider::-webkit-slider-thumb:hover{transform:scale(1.1)}.color-picker-wrapper{display:flex;align-items:center;gap:var(--spacing-sm)}.color-picker{width:40px;height:40px;border:2px solid var(--color-border);border-radius:var(--radius-md);cursor:pointer;padding:0;overflow:hidden}.color-picker::-webkit-color-swatch-wrapper{padding:0}.color-picker::-webkit-color-swatch{border:none}.color-value{font-size:var(--font-size-sm);font-family:monospace;color:var(--color-text-secondary)}.convert-btn{width:100%}.progress-section{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--spacing-2xl);margin-bottom:var(--spacing-lg);text-align:center}.progress-content{max-width:400px;margin:0 auto}.spinner{width:48px;height:48px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:var(--radius-full);margin:0 auto var(--spacing-lg);animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.progress-text{font-size:var(--font-size-base);color:var(--color-text-secondary);margin-bottom:var(--spacing-lg)}.progress-bar{height:8px;background:var(--color-bg-tertiary);border-radius:var(--radius-full);overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--color-primary),#8b5cf6);border-radius:var(--radius-full);transition:width var(--transition-normal)}.results{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--spacing-lg);animation:slideIn .3s ease}.results-header{margin-bottom:var(--spacing-lg)}.results-title{display:flex;align-items:center;gap:var(--spacing-sm);font-size:var(--font-size-lg);font-weight:600;color:var(--color-success)}.results-icon{width:24px;height:24px}.results-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:var(--spacing-md);margin-bottom:var(--spacing-lg);max-height:300px;overflow-y:auto;padding:var(--spacing-xs)}.result-item{position:relative;aspect-ratio:3/4;background:var(--color-bg-tertiary);border-radius:var(--radius-lg);overflow:hidden;cursor:pointer;transition:all var(--transition-fast)}.result-item:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.result-item img{width:100%;height:100%;object-fit:contain}.result-item-overlay{position:absolute;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity var(--transition-fast)}.result-item:hover .result-item-overlay{opacity:1}.result-item-overlay svg{width:24px;height:24px;color:#fff}.result-item-page{position:absolute;bottom:var(--spacing-xs);right:var(--spacing-xs);background:#000000b3;color:#fff;font-size:var(--font-size-xs);padding:2px 6px;border-radius:var(--radius-sm)}.results-actions{display:flex;gap:var(--spacing-md);flex-wrap:wrap}.results-actions .btn{flex:1;min-width:150px}.footer{text-align:center;padding:var(--spacing-lg);color:var(--color-text-muted);font-size:var(--font-size-sm)}.hidden{display:none!important}@media(max-width:640px){.header-content{padding:var(--spacing-sm) var(--spacing-md)}.logo-text{font-size:var(--font-size-lg)}.main{padding:var(--spacing-md)}.drop-zone{padding:var(--spacing-xl)}.drop-zone-icon{width:60px;height:60px}.drop-zone-title{font-size:var(--font-size-lg)}.thumbnails{grid-template-columns:repeat(auto-fill,minmax(80px,1fr))}.radio-group{flex-direction:column;gap:var(--spacing-sm)}.results-actions{flex-direction:column}.results-actions .btn{width:100%}}