Build a Signup Form with HTML & CSS

Your task is to build a styled signup form using only HTML and CSS.
This form will simulate a user registration system where people can create an account.

✅ Requirements (Single Line)

1. Name (text input, required, minimum 4 characters).
2. Email (email input, required, valid email format).
3. Password (password input, required, minimum 6 characters).
4. Submit button