rag_chatbot/
│── app.py                    # Main Streamlit app
│── components/
│   ├── sidebar.py            # Sidebar UI (model selection, upload, user info)
│   ├── chat_ui.py            # Chat UI styling and history
│── services/
│   ├── pdf_processing.py      # PDF loading and text splitting
│   ├── vector_store.py        # Vector database (FAISS) setup
│   ├── llm.py                 # Model initialization and QA chain
│── utils/
│   ├── helpers.py             # Helper functions (e.g., get_file_size)
│── docs/                      # Folder for storing uploaded PDFs (created dynamically)
│── requirements.txt           # Dependencies
│── README.md                  # Project documentation