I have created a fully responsive login and registration system using HTML, CSS, and JavaScript. Here's how it works:
Features Registration Page: Allows users to register with a valid email and password. It displays a message upon successful registration.
Login Page: Validates the entered email and password. If the user tries to log in without registering, it displays an error message stating "Username not registered."
Secured Page: Accessible only to registered users. Upon successful login, users are redirected to this secured page.
Local Storage: Stores registered users' data using JavaScript's localStorage. During login, it validates the entered credentials against this stored data.