my custom css file downloads then it STOPS!

It looks like all you need is to add a trailing slash so the directory is correct.

Solution: change 'style.css' to '/style.css' in your second wp_register_style() call on line 7.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)