:root{--primary-color: #1976d2;--primary-dark: #1565c0;--secondary-color: #424242;--success-color: #4caf50;--warning-color: #ff9800;--danger-color: #f44336;--info-color: #2196f3;--bg-primary: #ffffff;--bg-secondary: #f5f5f5;--bg-tertiary: #fafafa;--bg-dark: #1e1e1e;--bg-darker: #121212;--text-primary: #212121;--text-secondary: #757575;--text-inverse: #ffffff;--border-color: #e0e0e0;--border-dark: #424242;--shadow-sm: 0 1px 3px rgba(0,0,0,.12), 0 1px 2px rgba(0,0,0,.24);--shadow-md: 0 3px 6px rgba(0,0,0,.16), 0 3px 6px rgba(0,0,0,.23);--shadow-lg: 0 10px 20px rgba(0,0,0,.19), 0 6px 6px rgba(0,0,0,.23);--highlight-color: #ffeb3b;--highlight-current: #ff5722;--sidebar-width: 350px;--header-height: 60px;--toolbar-height: 50px;--status-height: 30px;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .35s ease}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;font-size:14px;line-height:1.5;color:var(--text-primary);background-color:var(--bg-secondary);overflow:hidden}.app-header{height:var(--header-height);background:var(--bg-primary);border-bottom:1px solid var(--border-color);box-shadow:var(--shadow-sm);z-index:100;position:relative}.header-content{display:flex;align-items:center;justify-content:space-between;height:100%;padding:0 20px}.app-title{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:600;color:var(--text-primary)}.app-icon{width:24px;height:24px;color:var(--primary-color)}.header-actions{display:flex;align-items:center;gap:10px}.app-main{display:flex;height:calc(100vh - var(--header-height) - var(--status-height))}.sidebar{width:var(--sidebar-width);background:var(--bg-primary);border-right:1px solid var(--border-color);overflow-y:auto;flex-shrink:0}.content-area{flex:1;display:flex;flex-direction:column;min-width:0}.toolbar{height:var(--toolbar-height);background:var(--bg-primary);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 15px;gap:20px}.toolbar-section{display:flex;align-items:center;gap:8px}.pdf-viewer-container{flex:1;background:var(--bg-secondary);overflow:auto;position:relative}.pdf-viewer{width:100%;height:100%;display:flex;justify-content:center;align-items:center;padding:20px}.status-bar{height:var(--status-height);background:var(--bg-tertiary);border-top:1px solid var(--border-color);display:flex;align-items:center;font-size:12px;color:var(--text-secondary)}.status-content{display:flex;align-items:center;justify-content:space-between;width:100%;padding:0 20px}.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border:none;border-radius:4px;font-size:13px;font-weight:500;cursor:pointer;transition:all var(--transition-fast);text-decoration:none;white-space:nowrap;background:transparent;color:var(--text-primary)}.btn:hover{transform:translateY(-1px)}.btn:active{transform:translateY(0)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.btn-primary{background:var(--primary-color);color:var(--text-inverse)}.btn-primary:hover:not(:disabled){background:var(--primary-dark);box-shadow:var(--shadow-md)}.btn-secondary{background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-primary)}.btn-secondary:hover:not(:disabled){background:var(--bg-secondary);box-shadow:var(--shadow-sm)}.btn-icon{padding:8px;min-width:36px;min-height:36px}.btn-icon svg{width:18px;height:18px}.btn-large{padding:12px 24px;font-size:15px}.btn-large svg{width:20px;height:20px}input[type=text],input[type=number],select{padding:8px 12px;border:1px solid var(--border-color);border-radius:4px;font-size:13px;background:var(--bg-primary);color:var(--text-primary);transition:border-color var(--transition-fast)}input[type=text]:focus,input[type=number]:focus,select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px #1976d233}.file-input{display:none}.welcome-screen{text-align:center;max-width:500px;margin:0 auto}.welcome-content{display:flex;flex-direction:column;align-items:center;gap:20px}.welcome-icon{width:64px;height:64px;color:var(--primary-color);opacity:.8}.welcome-content h2{font-size:24px;font-weight:600;color:var(--text-primary)}.welcome-content p{font-size:16px;color:var(--text-secondary);margin-bottom:10px}.feature-list{list-style:none;text-align:left;color:var(--text-secondary);font-size:14px}.feature-list li{padding:4px 0}.welcome-actions{display:flex;flex-direction:column;gap:15px;width:100%;max-width:300px}.pdf-canvas{max-width:100%;height:auto;box-shadow:var(--shadow-lg);border-radius:4px;background:#fff}.loading-indicator{display:flex;flex-direction:column;align-items:center;gap:15px;color:var(--text-secondary)}.loading-spinner{width:40px;height:40px;border:3px solid var(--border-color);border-top:3px solid var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.page-indicator,.zoom-indicator{font-size:13px;color:var(--text-secondary);min-width:80px;text-align:center}.keyboard-shortcut{display:flex;align-items:center;gap:5px}kbd{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:3px;padding:2px 5px;font-size:11px;font-family:monospace}@media (max-width: 768px){:root{--sidebar-width: 300px;--header-height: 50px;--toolbar-height: 45px}.app-title{font-size:16px}.app-icon{width:20px;height:20px}.header-content{padding:0 15px}.toolbar{padding:0 10px;gap:15px}.toolbar-section{gap:5px}.btn{padding:6px 12px;font-size:12px}.btn-icon{padding:6px;min-width:32px;min-height:32px}.btn-icon svg{width:16px;height:16px}.welcome-content h2{font-size:20px}.welcome-content p{font-size:14px}.welcome-icon{width:48px;height:48px}}@media (max-width: 1024px){.sidebar{position:absolute;top:0;left:-100%;height:100%;z-index:200;transition:left var(--transition-normal);box-shadow:var(--shadow-lg)}.sidebar.open{left:0}.content-area{width:100%}}*:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-tertiary)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}::selection{background:var(--primary-color);color:#fff}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.text-center{text-align:center}.mb-0{margin-bottom:0}.mb-1{margin-bottom:8px}.mb-2{margin-bottom:16px}.mb-3{margin-bottom:24px}.mt-0{margin-top:0}.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}.search-panel{padding:20px;height:100%;display:flex;flex-direction:column}.panel-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;padding-bottom:15px;border-bottom:1px solid var(--border-color)}.panel-header h3{font-size:16px;font-weight:600;color:var(--text-primary);margin:0}.search-section{flex:1;display:flex;flex-direction:column;gap:20px}.search-input-group{display:flex;gap:8px}.search-input{flex:1;padding:10px 12px;border:1px solid var(--border-color);border-radius:6px;font-size:14px;background:var(--bg-primary);color:var(--text-primary);transition:all var(--transition-fast)}.search-input:focus{border-color:var(--primary-color);box-shadow:0 0 0 2px #1976d233}.search-btn{background:var(--primary-color);color:#fff;border-radius:6px;padding:10px}.search-btn:hover:not(:disabled){background:var(--primary-dark)}.search-options{display:flex;flex-direction:column;gap:12px;padding:15px;background:var(--bg-tertiary);border-radius:6px;border:1px solid var(--border-color)}.checkbox-label{display:flex;align-items:center;gap:10px;cursor:pointer;font-size:13px;color:var(--text-primary);position:relative}.checkbox-label input[type=checkbox]{position:absolute;opacity:0;cursor:pointer}.checkmark{width:16px;height:16px;border:2px solid var(--border-color);border-radius:3px;background:var(--bg-primary);position:relative;transition:all var(--transition-fast);flex-shrink:0}.checkbox-label:hover .checkmark{border-color:var(--primary-color)}.checkbox-label input:checked+.checkmark{background:var(--primary-color);border-color:var(--primary-color)}.checkbox-label input:checked+.checkmark:after{content:"";position:absolute;left:4px;top:1px;width:4px;height:8px;border:solid white;border-width:0 2px 2px 0;transform:rotate(45deg)}.checkbox-label input:focus+.checkmark{box-shadow:0 0 0 2px #1976d233}.search-scope{display:flex;flex-direction:column;gap:10px}.scope-label{font-size:13px;font-weight:500;color:var(--text-primary)}.scope-select{padding:8px 12px;border:1px solid var(--border-color);border-radius:4px;background:var(--bg-primary);color:var(--text-primary);font-size:13px}.page-range-input{display:flex;align-items:center;gap:8px;margin-top:8px}.page-range-input input{flex:1;min-width:0}.page-range-input span{font-size:12px;color:var(--text-secondary)}.search-results{flex:1;display:flex;flex-direction:column;border:1px solid var(--border-color);border-radius:6px;overflow:hidden;min-height:200px}.results-header{display:flex;align-items:center;justify-content:space-between;padding:10px 15px;background:var(--bg-tertiary);border-bottom:1px solid var(--border-color)}.results-count{font-size:12px;font-weight:500;color:var(--text-secondary)}.results-navigation{display:flex;gap:4px}.results-navigation .btn{padding:4px;min-width:28px;min-height:28px}.results-navigation svg{width:14px;height:14px}.results-list{flex:1;overflow-y:auto;background:var(--bg-primary)}.result-item{padding:12px 15px;border-bottom:1px solid var(--border-color);cursor:pointer;transition:background-color var(--transition-fast)}.result-item:hover{background:var(--bg-tertiary)}.result-item.active{background:var(--primary-color);color:#fff}.result-page{font-size:11px;font-weight:600;color:var(--primary-color);margin-bottom:4px}.result-item.active .result-page{color:#fffc}.result-context{font-size:12px;line-height:1.4;color:var(--text-secondary)}.result-item.active .result-context{color:#ffffffe6}.result-highlight{background:var(--highlight-color);color:var(--text-primary);padding:1px 2px;border-radius:2px;font-weight:500}.result-item.active .result-highlight{background:#ffffff4d;color:#fff}.page-navigation{margin-top:20px;padding-top:20px;border-top:1px solid var(--border-color)}.page-navigation h4{font-size:14px;font-weight:600;color:var(--text-primary);margin-bottom:15px}.page-input-group{display:flex;gap:8px;margin-bottom:10px}.page-input{flex:1;min-width:0}.page-info{font-size:12px;color:var(--text-secondary);text-align:center;padding:8px 0}.textLayer{position:absolute;left:0;top:0;right:0;bottom:0;overflow:hidden;opacity:.2;line-height:1}.textLayer>span{color:transparent;position:absolute;white-space:pre;cursor:text;transform-origin:0% 0%}.textLayer .highlight{margin:-1px;padding:1px;background-color:var(--highlight-color);border-radius:4px}.textLayer .highlight.selected{background-color:var(--highlight-current)}.pdf-page-container{position:relative;margin:0 auto 20px;box-shadow:var(--shadow-lg);border-radius:4px;overflow:hidden;background:#fff}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--text-secondary);text-align:center;padding:40px 20px}.empty-state svg{width:48px;height:48px;margin-bottom:15px;opacity:.5}.empty-state h3{font-size:16px;margin-bottom:8px;color:var(--text-primary)}.empty-state p{font-size:14px;line-height:1.4}.error-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--danger-color);text-align:center;padding:40px 20px}.error-state svg{width:48px;height:48px;margin-bottom:15px}.error-state h3{font-size:16px;margin-bottom:8px}.error-state p{font-size:14px;line-height:1.4;color:var(--text-secondary);margin-bottom:20px}.pdf-search-highlight{position:absolute;background:var(--highlight-color);opacity:.6;border-radius:2px;pointer-events:none;mix-blend-mode:multiply}.pdf-search-highlight.current{background:var(--highlight-current);opacity:.8}.thumbnail-nav{position:absolute;right:20px;top:20px;width:150px;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:6px;box-shadow:var(--shadow-md);max-height:300px;overflow-y:auto;display:none}.thumbnail-item{padding:8px;border-bottom:1px solid var(--border-color);cursor:pointer;transition:background-color var(--transition-fast)}.thumbnail-item:hover{background:var(--bg-tertiary)}.thumbnail-item.active{background:var(--primary-color);color:#fff}.thumbnail-canvas{width:100%;height:auto;border-radius:2px}@media (max-width: 768px){.search-panel{padding:15px}.search-input-group{flex-direction:column}.search-options{padding:12px}.checkbox-label{font-size:12px}.page-input-group{flex-direction:column}.results-header{padding:8px 12px}.result-item{padding:10px 12px}.panel-header{margin-bottom:15px;padding-bottom:12px}.panel-header h3{font-size:14px}}@media (max-width: 480px){.search-panel{padding:12px}.search-section{gap:15px}.search-options{gap:10px}.page-navigation{margin-top:15px;padding-top:15px}}@media (prefers-color-scheme: dark){:root{--bg-primary: #2d2d2d;--bg-secondary: #1e1e1e;--bg-tertiary: #404040;--bg-dark: #121212;--text-primary: #ffffff;--text-secondary: #b0b0b0;--border-color: #404040;--border-dark: #606060}.pdf-canvas{box-shadow:0 0 20px #00000080}.welcome-screen{color:var(--text-primary)}}@media print{.app-header,.sidebar,.toolbar,.status-bar{display:none}.content-area{width:100%;height:auto}.pdf-viewer-container{overflow:visible}.pdf-canvas{box-shadow:none;max-width:100%}}