Website Layout Revamp & Search

I need a fresh layout for my existing site, starting with the homepage and all product-detail pages. The current structure feels dated; I want cleaner spacing, clearer visual hierarchy, and a design that adapts smoothly across desktop and mobile without disturbing the underlying codebase or SEO... (Budget: $30 - $250 USD, Jobs: CSS, HTML, JavaScript, PHP, UI / User Interface, UX / User Experience, Web Design, Website Design)