I’m building a business-focused e-commerce site and the first milestone I need tackled is a rock-solid shopping cart. The goal is to let customers add, edit, and remove items smoothly, see totals update instantly, and move on to checkout without friction. Here’s what I’m looking for: • A responsive cart module that works across desktop and mobile, built in a framework you’re comfortable maintaining (React, Vue, plain PHP—your call as long as it’s efficient and well-documented). • Clear, well-commented code so my in-house team can extend it later. • Basic coupon and quantity logic baked in from the start. • A lightweight admin view so I can track abandoned carts and export them as CSV. Payment gateway wiring and product catalog rendering aren’t in scope for this phase, but I’d like you to leave obvious hooks so we can bolt those on later without refactoring. When you hand off, I’ll test the module against a sample product feed and dummy checkout page. Acceptance criteria are straightforward: no console errors, page-load performance stays under two seconds, and every cart action reads/writes correctly to session or database. If that sounds like a neat, contained sprint you can knock out quickly, let’s talk timelines and get started.