Update app.py

app.py

@@ -29,7 +29,6 @@ def format_docs(docs):
     )
 
 def build_chain(groq_api_key: str):
-    """Build the LCEL RAG chain with the provided Groq key."""
     llm = ChatGroq(
         api_key=groq_api_key,
         model="llama-3.3-70b-versatile",
@@ -139,8 +138,8 @@ def clear_all():
     retrieved_docs = {}
     return [], "", "🗑️ Cleared. Upload a new PDF to start again."
 
-# ── Gradio UI ─────────────────────────────────────────────────
-with gr.Blocks(title="PDF RAG Chatbot", theme=gr.themes.Soft()) as demo:
+# ── Gradio UI (Gradio 6 compatible) ──────────────────────────
+with gr.Blocks(title="PDF RAG Chatbot") as demo:          # ← theme removed from here
 
     gr.Markdown("""
     # 📚 PDF RAG Chatbot
@@ -153,7 +152,8 @@ with gr.Blocks(title="PDF RAG Chatbot", theme=gr.themes.Soft()) as demo:
             groq_key_box = gr.Textbox(
                 label="Groq API Key",
                 placeholder="gsk_...",
-                type="password"
+                type="password",
+                value=os.environ.get("GROQ_API_KEY", "")
             )
             pdf_upload = gr.File(
                 label="Upload PDF",
@@ -164,7 +164,7 @@ with gr.Blocks(title="PDF RAG Chatbot", theme=gr.themes.Soft()) as demo:
 
         with gr.Column(scale=2):
             gr.Markdown("### 💬 Chat")
-            chatbot = gr.Chatbot(height=480, bubble_full_width=False)
+            chatbot = gr.Chatbot(height=480)               # ← bubble_full_width removed
             with gr.Row():
                 question_box = gr.Textbox(
                     placeholder="Ask a question about your PDF...",
@@ -195,4 +195,4 @@ with gr.Blocks(title="PDF RAG Chatbot", theme=gr.themes.Soft()) as demo:
         outputs=[chatbot, question_box, status_box]
     )
 
-demo.launch()
+demo.launch(theme=gr.themes.Soft())                        # ← theme moved here