I’m setting up a business website focused on online sales and need a clean, responsive front-end built entirely with semantic HTML5 and modern CSS3. The store will launch with two departments—Clothing & Accessories and Home & Garden—so the layouts must showcase those collections clearly while leaving room to add categories such as Electronics later. Here’s the scope I have in mind: • Design the key pages: landing, category grid, product detail, cart, and a simple checkout view. • Implement a flexible style guide (typography, colour palette, buttons, cards) that can be reused across new categories. • Ensure full responsiveness from mobile through desktop without relying on heavy frameworks; lightweight utility classes or Bootstrap 5 are fine, but plain CSS is preferred if it keeps load times low. • Prepare well-commented source files so my back-end developer can drop in the logic for inventory and payments. Acceptance criteria: 1. All pages pass W3C validation with no critical errors. 2. Google Lighthouse mobile score of 90+ for performance and accessibility. 3. Styles render consistently on the latest versions of Chrome, Safari, Firefox, and Edge. 4. Final hand-off includes organised HTML/CSS files, any asset sources, and a brief README explaining structure and custom classes. If you’ve delivered storefront fronts before and can share a quick sample, let’s talk—I’m ready to move fast.