app.py

import streamlit as st
# No need to import time if not simulating task here

# --- Page Configuration ---
# This sets the title and icon that appear in the default header
st.set_page_config(
    page_title="SBS V2.0 mapper", # This title will appear in the fixed header
    page_icon=":material/keyboard:", # This icon can also appear in the header
    layout="wide" # Optional: Use wide layout
)

# --- Custom CSS for Fixed Default Header ---
st.markdown("""
<style>
    /* Make the default Streamlit header fixed at the top */
    header {
        position: fixed; /* Use fixed positioning for viewport-relative stickiness */
        top: 0;         /* Position from the top edge */
        left: 0;        /* Position from the left edge */
        width: 100%;    /* Span the full width of the viewport */
        z-index: 100;   /* Ensure the header is above other content */
        background-color: rgb(240, 242, 246); /* Match Streamlit's default header background color */
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1); /* Optional: Add a subtle shadow */
        /* You might need to adjust padding if the default header height changes */
    }

    /* Add padding to the main content area to prevent it from being hidden behind the fixed header */
    /* This targets the main container div below the header and sidebar */
    /* You might need to inspect the Streamlit app's HTML structure in your browser
       (using developer tools) to find the precise data-testid or class for this div
       if "stAppViewContainer" or "stVerticalBlock" doesn't work reliably,
       but stAppViewContainer is a common target. */
    [data-testid="stAppViewContainer"] {
        padding-top: 70px; /* Adjust this value to be slightly more than your header's height */
    }

    /* Also add padding to the sidebar content */
     [data-testid="stSidebar"] {
         padding-top: 70px; /* Use the same padding value as the main content */
     }

     /* If the layout is 'wide', adjust the padding on the main container */
     /* This helps keep content aligned if the header has internal padding/margins */
    .main .block-container {
        padding-top: 1rem; /* Or match default streamlit content padding */
    }


</style>
""", unsafe_allow_html=True)

# --- App Content (will scroll below the fixed header) ---

# The logo placed here will likely appear in the sidebar or main body,
# not in the fixed default header. Use st.set_page_config for the header icon.
st.logo(image="images/menu_book_60dp_75FBFD.png")

st.sidebar.header("SBS V2.0 mapper")
st.sidebar.write("(work in progress)")
st.sidebar.text("Demo by JA-RAD")

# Note: st.title and st.subheader here will appear *below* the fixed header,
# as they are part of the main app content flow.
st.title("Map descriptions to SBS codes with Sentence Transformer + Reasoning")
st.subheader("Select specific Chapter for quicker results")


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

pg = st.navigation(pages=[type_text_page]) # WITHOUT SECTIONS
pg.run()

# Add some extra content to make the page scrollable for testing
for i in range(100): # Increased lines to ensure sufficient scrolling
    st.write(f"This is scrollable content line {i}")