Update app.py

app.py

@@ -6,10 +6,18 @@ def main():
 
     agreed = st.checkbox("I agree to the terms of service")
     username = st.text_input("Enter your username")
-    
+
     if st.button("Submit") and agreed and username.strip():
-        st.title("Congratulations!")
-        st.write(f"Welcome to our platform, {username}!")
+        st.experimental_rerun()
+        st.session_state["user_name"] = username
+        st.session_state["tos_agreed"] = True
+        st.experimental_reroute("/congratulations")
+
+    if not st.session_state.get("tos_agreed", False):
+        return
+
+    st.title("Congratulations!")
+    st.write(f"Welcome to our platform, {st.session_state['user_name']}!")
 
 if __name__ == "__main__":
     main()