mohdkhalid26/RedParts ? reverse-engineered prompt

Build me a clean React web app from this project setup.

I want a simple modern site that works well on desktop and mobile, loads fast, and looks polished without feeling busy. Please make the main screen easy to understand at a glance, with clear navigation, a nice layout, and reusable components so it is easy to change later. Use the existing React app structure, keep the code organized, and make sure everything runs properly with the usual development and production scripts.

If anything is unclear, make a sensible choice and keep it beginner friendly. Add a few placeholder sections and sensible sample content so I can see how the app is supposed to feel, and make sure the final result is ready to open in the browser and tweak from there.