seifahmyy/movievault ? reverse-engineered prompt

Build me a clean movie vault website in a single HTML page.

I want it to feel like a simple place where someone can browse movies, search for titles, and save a few favorites to keep track of them. Make it look nice on desktop and mobile, with a strong movie themed design, clear cards or tiles for each movie, and an easy way to open more details about a movie when you click it.

Keep it simple and polished, since this looks like a small front end project. If you need to use current best practice for anything, look up the latest docs online. Please make sure the page is responsive, easy to use, and visually appealing, with sensible placeholder data if there is no real backend yet.