def launch_interface():
    with gr.Blocks(
        title="RAG App",
        css="""
        .gradio-container {
            background-color: #e6fff7 !important;
        }
        #header-text {
            text-align: center;
            color: #2b6777;
        }
        """
    ) as demo:

        gr.Markdown("""<div id='header-text'><h1>RAG Bot with LlamaIndex (PDF + TXT)</h1></div>""")

        with gr.Tabs():
            with gr.Tab("Paul Graham"):
                # ✅ Logo moved above heading
                if os.path.exists("data/logo.png"):
                    gr.Image("data/logo.png", show_label=False, container=False, height=120)

                gr.Markdown("""
                    <div id='header-text'>
                        <h2>Paul Graham: Writing and Thinking</h2>
                        <p>Select a question or ask your own based on the essay.</p>
                    </div>
                """)

                dropdown_pg = gr.Dropdown(label="Pick a Question", choices=[""] + paul_questions, interactive=True)
                textbox_pg = gr.Textbox(label="Ask Anything", placeholder="Type your question...", lines=2)
                output_pg = gr.Textbox(label="Response", lines=10)
                submit_pg = gr.Button("Submit")
                clear_pg = gr.Button("Clear")

                def handle_pg_submit(drop_value, text_value):
                    final_query = drop_value if drop_value else text_value
                    if not final_query.strip():
                        return "❌ Please select or enter a question."
                    return query_pg(final_query)

                dropdown_pg.change(fn=query_pg, inputs=dropdown_pg, outputs=output_pg)
                submit_pg.click(handle_pg_submit, inputs=[dropdown_pg, textbox_pg], outputs=output_pg)
                clear_pg.click(lambda: ("", "", ""), outputs=[dropdown_pg, textbox_pg, output_pg])

            with gr.Tab("Insurance"):
                gr.Markdown("""
                    <div id='header-text'>
                        <h2>Understanding Insurance</h2>
                        <p>Explore key insurance concepts or ask your own questions.</p>
                    </div>
                """)

                dropdown_ins = gr.Dropdown(label="Pick a Question", choices=[""] + insurance_questions, interactive=True)
                textbox_ins = gr.Textbox(label="Ask Anything", placeholder="Type your question...", lines=2)
                output_ins = gr.Textbox(label="Response", lines=10)
                submit_ins = gr.Button("Submit")
                clear_ins = gr.Button("Clear")

                def handle_ins_submit(drop_value, text_value):
                    final_query = drop_value if drop_value else text_value
                    if not final_query.strip():
                        return "❌ Please select or enter a question."
                    return query_ins(final_query)

                dropdown_ins.change(fn=query_ins, inputs=dropdown_ins, outputs=output_ins)
                submit_ins.click(handle_ins_submit, inputs=[dropdown_ins, textbox_ins], outputs=output_ins)
                clear_ins.click(lambda: ("", "", ""), outputs=[dropdown_ins, textbox_ins, output_ins])

    demo.launch()