NhanPhamThanh-IT/Autumn-Auth-Pages ? reverse-engineered prompt

Build me a polished authentication page set for a modern web app. I want a login page and a signup page with a cozy autumn look, animated falling leaves or similar background motion, and a soft glass style card in the middle. Make it responsive so it looks good on desktop and mobile, and keep the forms clean and reusable so the fields can be changed easily later.

Please use React with Vite, and include both a JavaScript version and a TypeScript version if that fits the project structure. Set up simple routing so /login and /signup work, and have the home page and any unknown page send people to the login screen. The submit actions can stay as demo behavior for now, like logging the form data, since I do not need a real backend yet.

I also want the theme, images, and form fields to be easy to customize later. Look up current docs online if you need to.