HTML Theme Revamp & Catalogue

I have a custom-built SHOPIFY HTML website that needs a visual overhaul. The primary focus is design: refreshing the header and footer, modernising the navigation menu, and re-styling all product display sections. In addition, I want an entirely new rental catalogue page built from scratch that matches the updated look and feel, so visitors can browse rentals in a clean, consistent interface.

Here’s what I expect as concrete deliverables:
• Redesigned header and footer with mobile-friendly layout
• Fix font on responsive navigation menu
• Updated product display sections using the new design language
• A brand-new rental catalogue page coded in pure HTML/CSS/JS, wired into my existing theme assets, ready for me to populate with content
• Custom page slider
• Strikethrough price custom code
• Custom code rental catalogue page
• Will provide canva document with design change layout

Please keep the code semantic, well-commented, and fully compatible with modern browsers. Once complete, I’ll test everything on staging; if the pages render flawlessly and the styles remain consistent across breakpoints, the project is done.