grammar - Is “far from perfect” grammatical?

Is “far from perfect” grammatical?

Here’s my analysis:

1. It’s ungrammatical because the object of preposition from must be a noun, not an adjective(perfect).


2. It’s grammatical because perfect can be a noun.


3. It’s grammatical because perfect is the shortened version of the noun phrase “perfect state” or “being perfect”.


4. It’s grammatical because “far from” is an adverbial phrase.

I think no. 4 is most likely correct. If it’s the case, what does it modify: the verb “is” or the adjective “perfect”?