.file-item{display:flex;align-items:center;justify-content:space-between;padding:8px 12px;margin:4px 0;background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:6px;cursor:pointer;transition:all .2s ease}.file-item:hover{background:var(--bg-hover);border-color:var(--primary-color)}.file-item.active{background:rgba(66,133,244,.1);border-color:var(--primary-color)}.file-info{flex:1;min-width:0}.file-name{font-weight:500;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-bottom:2px}.file-details{font-size:12px;color:var(--text-secondary)}.file-actions{display:flex;gap:4px}.file-action-btn{padding:4px 6px;background:0 0;border:0;border-radius:4px;cursor:pointer;color:var(--text-secondary);transition:all .2s ease;font-size:14px}.file-action-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.file-action-btn.remove-file:hover{background:var(--error-color);color:#fff}.file-separator{display:flex;align-items:center;margin:16px 0 8px;padding:0 8px}.file-separator-line{flex:1;height:1px;background:var(--border-light)}.file-separator-label{padding:0 12px;font-size:12px;font-weight:600;color:var(--text-secondary);background:var(--bg-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:150px}.thumbnail{margin-bottom:8px}.thumbnail,.thumbnail-content{position:relative}.thumbnail-canvas{width:100%;height:auto;border-radius:4px;box-shadow:0 2px 4px rgba(0,0,0,.1);display:block;max-width:100%}.thumbnail-info{position:absolute;bottom:4px;left:4px;right:4px;background:rgba(0,0,0,.8);color:#fff;padding:2px 6px;border-radius:3px;font-size:10px;display:flex;justify-content:space-between;align-items:center}.thumbnail-number{font-weight:600}.thumbnail-source{font-size:9px;opacity:.8;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:60px}.multi-pdf-export-info{text-align:center;padding:20px}.info-icon{font-size:48px;margin-bottom:16px}.info-content h4{margin:0 0 8px;color:var(--text-primary)}.info-content p{margin:0 0 16px;color:var(--text-secondary);line-height:1.5}.merge-suggestion{background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:8px;padding:16px;margin:16px 0}.merge-suggestion h5{margin:0 0 8px;color:var(--primary-color);font-size:14px}.merge-suggestion p{margin:0;font-size:13px;color:var(--text-secondary)}.thumbnail.dragging{opacity:.5;transform:rotate(5deg)}.thumbnail.drag-over{border:2px dashed var(--primary-color);background:rgba(66,133,244,.1)}body.dark-mode .file-separator-label{background:var(--bg-primary)}body.dark-mode .thumbnail-info{background:rgba(255,255,255,.9);color:var(--text-primary)}@media (max-width:768px){.file-separator-label{max-width:100px;font-size:11px}.thumbnail-source{display:none}.file-name{font-size:13px}.file-details{font-size:11px}}