app.py

import streamlit as st 

import time

# --- Custom CSS ---
# WARNING: These selectors might change with Streamlit versions.
# Always inspect your app's HTML structure to confirm them.

# It's crucial to estimate or dynamically get the header's height.
# For this example, we'll assume a fixed header height (e.g., 3.5rem or 56px).
# You might need to adjust this value based on your Streamlit version and app title length.
HEADER_HEIGHT = "60px" # Adjust this value as needed

custom_css = f"""
<style>
    /* Target the Streamlit header */
    header[data-testid="stHeader"] {{
        position: sticky !important;
        top: 0 !important;
        z-index: 1000 !important; /* High z-index to keep it on top */
        background-color: #0F1116 !important; /* Match Streamlit's dark theme header or your preference */
        /* If your header background is transparent or semi-transparent by default,
           ensure you set a solid color to prevent content from showing through. */
    }}

    /* Target the main app view container to add padding AFTER the header */
    /* This selector targets the container that holds the main page content */
    section[data-testid="stAppViewContainer"] > div:first-child {{
        padding-top: {HEADER_HEIGHT} !important;
    }}

    /* Fallback for older Streamlit versions or different structures if the above doesn't work.
       You might need to find a more specific selector for the main content wrapper.
       For example, some apps might be wrapped in a div directly under `section.main`.
    */
    /*
    .main .block-container {{
        padding-top: {HEADER_HEIGHT} !important;
    }}
    */

    /* Ensure the sidebar scrolling is independent if needed,
       though typically it is already. */
    /*
    section[data-testid="stSidebar"] {{
        top: 0px; // If you want sidebar to also respect top
    }}
    */
</style>
"""
st.markdown(custom_css, unsafe_allow_html=True)

# --- Your Streamlit App ---
st.title("Sticky Header App")
st.sidebar.header("Sidebar Content")
st.sidebar.write("This sidebar should scroll independently.")
for i in range(5):
    st.sidebar.write(f"Sidebar Item {i+1}")


st.header("Main Application Content")
st.write(f"The header above should remain sticky. The top padding of this content section has been adjusted by approximately {HEADER_HEIGHT}.")

if st.button("Simulate Work (triggers status widget)"):
    with st.spinner("Processing... Please wait."):
        time.sleep(3)
    st.success("Done!")

for i in range(50):
    st.write(f"Scrollable content line {i + 1}.")

st.info(f"Current Date/Time in Al Khobar: {time.strftime('%Y-%m-%d %H:%M:%S %Z', time.localtime())} (Note: This is server time if deployed, or local time if run locally. Hugging Face Spaces run on UTC.)")
st.warning("Remember: The CSS selectors used here for the header and main content might change with Streamlit updates. You may need to re-inspect and adjust them.")

# --- SHARED ON ALL PAGES ---
st.logo(image="images/menu_book_60dp_75FBFD.png")
st.sidebar.title("SBS V2.0 mapper")
st.sidebar.subheader("(work in progress)")
st.sidebar.text("Demo by JA-RAD")

# --- PAGE SETUP ---
type_text_page = st.Page(
    page="pages/type_text.py",
    title="DEMO (work in progress)",
    icon=":material/keyboard:",
    default=True,)

# --- NAVIGATION SETUP ---
pg = st.navigation(pages=[type_text_page]) # WITHOUT SECTIONS
#pg = st.navigation({"Chapter_Index": [start_page], "Demo": [type_text_page, upload_file_page], "About": [about_page]}) # WITH SECTIONS
pg.run()