allow optional filter

app.py

@@ -38,20 +38,33 @@ df = get_data()
 st.title("🌍 CGD Survey Explorer (Live DB)")
 
 st.sidebar.header("🔎 Filter Questions")
-selected_country = st.sidebar.selectbox("Select Country", sorted(df["country"].unique()))
-selected_year = st.sidebar.selectbox("Select Year", sorted(df["year"].unique()))
-keyword = st.sidebar.text_input("Keyword Search", "")
 
-# Filtered data
+# Dropdown filters (optional)
+countries = sorted(df["country"].dropna().unique())
+years = sorted(df["year"].dropna().unique())
+
+selected_countries = st.sidebar.multiselect("Select Country", countries, default=countries)
+selected_years = st.sidebar.multiselect("Select Year", years, default=years)
+keyword = st.sidebar.text_input("Keyword Search (in question)", "")
+
+# Column selector
+all_columns = df.columns.tolist()
+default_columns = ["country", "question", "responses"]
+selected_columns = st.sidebar.multiselect("Columns to Display", all_columns, default=default_columns)
+
+# Apply filters
 filtered = df[
-    (df["country"] == selected_country) &
-    (df["year"] == selected_year) &
-    (df["question_text"].str.contains(keyword, case=False, na=False))
+    df["country"].isin(selected_countries) &
+    df["year"].isin(selected_years)
 ]
 
-st.markdown(f"### Results for **{selected_country}** in **{selected_year}**")
-st.dataframe(filtered[["country", "question_text", "answer_text"]])
+if keyword:
+    filtered = filtered[filtered["question"].str.contains(keyword, case=False, na=False)]
 
-if filtered.empty:
+# Show results
+st.markdown("### Filtered Results")
+if not filtered.empty:
+    st.dataframe(filtered[selected_columns])
+else:
     st.info("No matching questions found.")