The coupon-code toggle on my WooCommerce checkout (Ciyashop theme) collapses instantly on iPhone and iPad, so customers never get a chance to type their code. The non-toggle version of the coupon field on the cart page works perfectly, so I simply want that proven cart-page implementation mirrored on the checkout screen. Please recreate the cart-page coupon field exactly—same look, same behaviour—by adding the necessary hooks, filters, or small JS/CSS tweaks inside the child-theme’s functions.php (or assets loaded from there). That way future WordPress, WooCommerce, or theme updates will leave the fix intact. Key points for success: • Works smoothly on both iPhone and iPad as well as desktop browsers. • Displays identically to the cart page’s coupon area. • No core, plugin, or parent-theme files modified—child theme only. When you’re done, share the updated functions.php (with clear inline comments) and note any template overrides or additional files you created so I can keep them under version control.