/* ============================================================================ D9Commerce — responsive layer ---------------------------------------------------------------------------- ONE authoritative stylesheet for how the product behaves across screen sizes. Loaded LAST in every shell (inc/layout.php, public/templates/ header.php, inc/pages/home.php|legal.php|help.php) so it always wins the cascade against the layered sheets underneath it. Why it exists: before this file, responsive rules were scattered across style.css (768), cr-design.css (992/640), d9-unify.css (1100/980/768/640/ 480/400), landing.css (1050/900/640/520), inventory-pro.css (768) and ~30 ad-hoc @media blocks inside PHP