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(max-width:768px){.nav{display:none}.hamburger{display:block}.product-grid,.category-grid{grid-template-columns:1fr}.product-detail{grid-template-columns:1fr;gap:24px}.product-images{position:static}.shop-layout{grid-template-columns:1fr}.shop-sidebar{display:none}.shop-sidebar.open,.filter-toggle{display:block}.cart-layout,.checkout-layout,.contact-layout,.blog-grid{grid-template-columns:1fr}.artists-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1fr}.hero h1{font-size:2rem}.form-row,.admin-layout{grid-template-columns:1fr}.admin-sidebar{display:none}.admin-stats{grid-template-columns:repeat(2,1fr)}}