>>213470509
>So that's where na-adjectives come from, and it's why na-adjectives look like they can be basically any kind of word. Anything you can put a da on you can put a na on, at least grammatically speaking.
>Although grammatically speaking it's always correct, that doesn't mean it's always natural, makes sense, or is something you'd ever say.

"猫な X" is one example mentioned in the second paragraph above that is said to be an unnatural expression. However, sometimes unusual expressions are used deliberately to make sentences or phrases more memorable, impressive, or casual/slangy. For example, there are couples of diary titles that include "猫な生活".
The author may be a cat owner, or someone who lives a carefree life like a cat or perhaps both.