VAT Display & Mobile Fixes

I need three tidy-ups carried out on my live Shopify store.

First, every price must show both figures: the net amount (“+VAT”) and the gross amount (“inc VAT”). This has to appear consistently on product pages, the cart page and right through to the checkout, with the maths handled automatically so nothing can drift out of sync when discounts or edits are applied.

Second, on mobile the drop-down menus have stopped opening. The issue affects the main navigation as well as the product-filter menus. I need them functioning smoothly again without disrupting the desktop experience.

Finally, on the Add-to-Cart view I want the wording and the buttons brought into perfect alignment so the layout feels professional and balanced on all screen sizes.

Deliverables
• Dual VAT pricing visible on product, cart and checkout screens
• Working mobile drop-downs for main navigation and product filters
• Aligned copy and buttons in the Add-to-Cart area, tested across common devices

Please keep theme edits lean (Liquid/CSS/JS only where required) so future updates remain straightforward.