from pathlib import Path

def get_work_dirs(input_path: Path) -> dict:
    """
    Get unified work directory paths for a specific book.
    
    Structure:
    .work/
      ├── {book_name}/
      │   ├── book_structure.json
      │   ├── manifest.json
      │   ├── assets/
      │   └── chunks/
    """
    book_name = input_path.stem
    work_root = Path(".work") / book_name
    
    return {
        "root": work_root,
        "structure": work_root / "book_structure.json",
        "manifest": work_root / "manifest.json",
        "assets": work_root / "assets",
        "chunks": work_root / "chunks",
    }