Form Flipping Animation Demo

Files
- index.html: accessible login/create-account form markup
- styles.css: responsive layout, animated tab indicator, reduced-motion support
- script.js: keyboard-accessible tab switching and demo-only submit response

Open index.html in a modern browser. This front-end example does not create
accounts, authenticate users, transmit form data, or store passwords. Connect
the forms to a secure server-side authentication flow before using them in a
real application.
