fixing demo launch

app.py

@@ -10,15 +10,15 @@ def load_document(file):
         return "Please upload a PDF file."
     try:
         vectorstore = process_pdf(file.name)
-        return "Document processed successfully."
+        return "✓ Document processed successfully."
     except Exception as e:
-        return f"Error: {str(e)}"
+        return f"❌ Error: {str(e)}"
 
 def ask(question):
     if vectorstore is None:
-        return "Upload a document first", "", ""
+        return "Upload a document", "", ""
     if not question.strip():
-        return "Please enter a question", "", ""
+        return "Enter a question", "", ""
     try:
         return run_rag(question, vectorstore)
     except Exception as e:
@@ -28,18 +28,20 @@ with gr.Blocks(title="Tech Explainer RAG") as demo:
     gr.Markdown("# Tech Explainer — RAG with Automatic Evaluation")
 
     file = gr.File(label="Upload PDF", file_types=[".pdf"])
-    load_btn = gr.Button("Process PDF")
-    status = gr.Textbox(label="Status")
+    load_btn = gr.Button("Process PDF", variant="primary")
+    status = gr.Textbox(label="Status", interactive=False)
+
+    gr.Markdown("---")
 
     question = gr.Textbox(label="Question", placeholder="Ask a question about the document...")
-    ask_btn = gr.Button("Ask")
+    ask_btn = gr.Button("Ask", variant="primary")
 
-    answer = gr.Textbox(label="Answer", lines=5)
-    sources = gr.Textbox(label="Sources", lines=2)
-    evaluation = gr.Textbox(label="Evaluation", lines=3)
+    answer = gr.Textbox(label="Answer", lines=5, interactive=False)
+    sources = gr.Textbox(label="Sources", lines=2, interactive=False)
+    evaluation = gr.Textbox(label="Evaluation", lines=3, interactive=False)
 
     load_btn.click(load_document, inputs=file, outputs=status)
     ask_btn.click(ask, inputs=question, outputs=[answer, sources, evaluation])
 
 if __name__ == "__main__":
-    demo.launch()
+    demo.queue().launch()