Update app.py

app.py

@@ -47,6 +47,37 @@ st.markdown(
     """,
     unsafe_allow_html=True
 )
+# ---------- Password Gate (add this near the top, before any model loading) ----------
+import os, streamlit as st
+
+def _require_password():
+    """Stop the app until the correct password is entered.
+       Password is read from environment variable APP_PASSWORD.
+       If APP_PASSWORD is not set, the gate is disabled (app is open)."""
+    expected = os.environ.get("APP_PASSWORD", "").strip()
+    if not expected:
+        return  # gate disabled (no password configured)
+
+    # already authenticated this session?
+    if st.session_state.get("_authed", False):
+        return
+
+    st.title("🔒 Protected")
+    st.write("This app requires a password to continue.")
+
+    with st.form("pw_form", clear_on_submit=False):
+        pw = st.text_input("Password", type="password")
+        ok = st.form_submit_button("Enter")
+    if ok:
+        if pw == expected:
+            st.session_state["_authed"] = True
+            st.rerun()
+        else:
+            st.error("Incorrect password. Please try again.")
+    st.stop()  # block the rest of the script until authenticated
+
+_require_password()
+# -------------------------------------------------------------------------------
 
 # =========================
 # Helpers