Krevia is a Shopify theme built around one rule enforced in CI: total JS stays under 60KB gzipped, or the build fails. No framework runtime, no bloat — just fast, native storefronts. Native filtering, quick-add, variant swatches, sticky add-to-cart, subscriptions and popups — zero required apps. WCAG AA accessible by default. A real live-preview theme editor. Built solo because I was tired of installing five apps just for a fast product page. Feedback welcome.