fix sign in

app.py

@@ -291,8 +291,8 @@ def main():
             login_button = gr.LoginButton(value="🔑 Sign in", size="sm")
             gr.Markdown("")  # Empty space for alignment
         
-        pro_message = gr.Markdown(visible=False)
-        main_interface = gr.Column(visible=True)
+        signin_message = gr.Markdown("## 🔑 Sign In Required\n\nPlease sign in with your Hugging Face account to access the synthetic data generation service. Click the **Sign in** button above to continue.", visible=True)
+        main_interface = gr.Column(visible=False)
         
         # Store the current oauth token for use in submit_request
         current_oauth_token = gr.State(None)
@@ -538,31 +538,42 @@ def main():
                 return "👤 **Free User**: You can generate up to 100 samples per request. [Upgrade to PRO](http://huggingface.co/subscribe/pro?source=synthetic-data-universe) for 10,000 samples."
 
         def control_access(profile: Optional[gr.OAuthProfile] = None, oauth_token: Optional[gr.OAuthToken] = None):
-            # Always show the interface, whether user is logged in or not
-            limit_msg = update_user_limits(oauth_token)
-            
-            # Update slider maximum based on user tier
+            # Require users to be signed in
             if oauth_token is None:
-                max_samples = MAX_SAMPLES_FREE
-                button_text = "🔑 Sign in for PRO benefits"
+                # User is not signed in - show sign-in prompt, hide main interface
+                return (
+                    gr.update(visible=False),  # main_interface
+                    gr.update(visible=True),   # signin_message
+                    oauth_token,               # current_oauth_token
+                    "",                        # user_limit_info (empty when not signed in)
+                    gr.update(),               # num_output_samples (no change)
+                    gr.update(value="🔑 Sign in")  # login_button
+                )
             else:
+                # User is signed in - show main interface, hide sign-in prompt
+                limit_msg = update_user_limits(oauth_token)
                 is_pro = verify_pro_status(oauth_token)
                 max_samples = MAX_SAMPLES_PRO if is_pro else MAX_SAMPLES_FREE
+                
                 if is_pro:
                     button_text = f"✨ Signed in as PRO ({profile.name if profile else 'User'})"
                 else:
                     button_text = f"👤 Signed in as {profile.name if profile else 'User'}"
-            
-            slider_update = gr.update(maximum=max_samples)
-            button_update = gr.update(value=button_text)
-            
-            return gr.update(visible=True), gr.update(visible=False), oauth_token, limit_msg, slider_update, button_update
+                
+                return (
+                    gr.update(visible=True),   # main_interface
+                    gr.update(visible=False),  # signin_message
+                    oauth_token,               # current_oauth_token
+                    limit_msg,                 # user_limit_info
+                    gr.update(maximum=max_samples),  # num_output_samples
+                    gr.update(value=button_text)     # login_button
+                )
 
 
         # Handle login state changes - LoginButton automatically handles auth state changes
         # The demo.load will handle both initial load and auth changes
         
-        demo.load(control_access, inputs=None, outputs=[main_interface, pro_message, current_oauth_token, user_limit_info, num_output_samples, login_button])
+        demo.load(control_access, inputs=None, outputs=[main_interface, signin_message, current_oauth_token, user_limit_info, num_output_samples, login_button])
         demo.queue(max_size=None, default_concurrency_limit=None).launch(show_error=True)
 
 if __name__ == "__main__":