Add Streamlit demo

app.py

@@ -1,6 +1,26 @@
-# app.py
 import streamlit as st
+import requests
 
-st.title("Spatial Parse Demo")
-x = st.slider('Select a value')
-st.write(x, 'squared is', x * x)
+st.title("Spatial Parser Demo")
+
+# 密码验证
+password = st.text_input("Enter access password:", type="password")
+if password != "demo1234":
+    st.warning("Please enter the correct password.")
+    st.stop()
+
+# 输入框
+text = st.text_area("Enter your spatial description:")
+
+if st.button("Submit"):
+    with st.spinner("Calling secure backend..."):
+        try:
+            response = requests.post(
+                "https://dsbb0707-SpatialParse_back.hf.space/predict",
+                json={"text": text},
+                timeout=20
+            )
+            result = response.json().get("result", "No result returned.")
+            st.success(f"Parsed Output:\n\n{result}")
+        except Exception as e:
+            st.error(f"Backend error: {e}")