usama-Mubashar/youtube-clone-full-stack- ? reverse-engineered prompt

Build me a YouTube style video app in React that feels like a real modern streaming site. I want a clean home page with a top search bar, sidebar navigation, video cards, a video details page, and a watch page that plays a selected video with related videos beside it. Make it responsive so it works nicely on desktop and mobile.

Use this project as the base and keep the design polished, simple, and familiar, like YouTube. Set it up so I can later connect it to a backend for things like videos, channels, likes, comments, and search results. If you need current best practices or a small UI library, look up the latest docs online and use whatever fits best.

Please organize the code cleanly, add reusable components, and make sure the app runs smoothly with a nice overall layout and good spacing.