SIGN-IN PAGE UPDATE
===================
If your current PetHub database is already working, replace ONLY:
  login.php
  includes/header.php
  assets/css/login.css (new file)

Keep your current config/config.php and uploads folder.
No SQL import or new admin account is required for this design update.
Refresh the login page with Ctrl+F5 after copying the files.

Includes a responsive purple/white design, animated pet illustration,
page entrance and button hover animations, password show/hide and a
Caps Lock reminder. Reduced-motion settings are respected.
Existing database login, session handling and CSRF protection are retained.
Validated at 1440, 768, 390 and 320 px widths, with working admin sign-in.
