safak/youtube23 ? reverse-engineered prompt

Build me a polished learning project for “Lama Dev Season 3” that looks and feels like a real modern web app, with a clean homepage, simple navigation, and a few example sections that show off the main idea clearly.

I want it to be easy to run and easy to understand, with a nice visual design, responsive layout, and sensible defaults so it works well on desktop and mobile. If anything is unclear from the current files, use your judgment and keep it simple, but make sure the result feels complete and presentable.

Please set up the app so I can open it and immediately see something useful, not a blank starter screen. Add any placeholder content needed, keep the code tidy, and if you need to check current best practices or docs online, go ahead.