Update app.py

app.py

@@ -193,8 +193,8 @@ def main():
         col1, col2 = st.columns(2)
         
         with col1:
-            # CSV download
-            csv = df.to_csv(index=False, encoding='utf-8-sig')
+            # CSV download with proper encoding
+            csv = df.to_csv(index=False, encoding='utf-8-sig').encode('utf-8-sig')
             st.download_button(
                 label="📥 下載 CSV",
                 data=csv,