streamlit_app/app_streamlit.py

import os
import json
import time
import pandas as pd
import streamlit as st
import requests

# -----------------------------------------------------
# MUST COME FIRST BEFORE ANY OTHER STREAMLIT COMMAND
# -----------------------------------------------------
st.set_page_config(
    page_title="ExtraaLearn – Lead Conversion",
    page_icon="📈",
    layout="wide"
)

# -----------------------------------------------------
# Backend API URL (from HF Environment Variable)
# -----------------------------------------------------
BACKEND_URL = os.getenv("BACKEND_URL", "").rstrip("/")

if not BACKEND_URL:
    st.warning(
        "⚠️ BACKEND_URL is not set. Set an environment variable BACKEND_URL "
        "to your backend Space URL (without trailing slash). "
        "Example: https://<username>-<backendspace>.hf.space"
    )