Amarkumar66428/Amazon-clone ? reverse-engineered prompt

Build me a polished Amazon style shopping site in this React app.

I want a homepage that feels like an online store, with a big header, search bar, featured products, category sections, and product cards that look clean and modern. Make it responsive so it still works nicely on mobile. Include a product details view, a shopping cart, and a simple checkout flow that lets me add, remove, and update items. If you can, add a basic login and signup experience too, even if it is just a simple frontend version for now.

Please match the Amazon vibe with strong spacing, familiar colors, and lots of small UI details like ratings, price labels, buttons, and a cart icon. Use the existing React setup and keep the code organized and easy to follow. If you need current styling or component ideas, look up current docs or examples online and adapt them.