Itz-Ashlynn/Terabox-Web ? reverse-engineered prompt

Build me a modern TeraBox file downloader website that feels polished and easy to use.

I want a simple page where someone can paste a TeraBox share link, add their ndus cookie, and then get the file details and a direct download link. It should also support a proxy download option, show the file name, size, and thumbnail if available, and handle errors in a friendly way.

Make it look clean and professional with a glassy modern design, smooth animations, and both dark and light mode. It should work well on mobile and desktop, and have good loading states and accessibility.

Also include a clear help section that explains how to get the cookie and how to use the app. If it makes sense, add a small API endpoint for downloading too, since developers may want to use it directly.

Use the current best practices for React and TypeScript, and look up any current docs online if you need to.