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夕暮れで 二人 少しずつ **見えなくなっていって** In this case I suppose it 見えなく(invisible) +
成っていって（becoming）.

But in this case below how would it work?

> サヨナラ **会えなくなったって** 僕らは続きがあるから
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grammar kanji verbs syntax
なく after a verb, what are the uses?
In the first example, your understanding is correct. In The second example, って
has a different usage than the first. It means "although"

In [This webpage](https://ja.wiktionary.org/wiki/%E3%81%A3%E3%81%A6), at the
very end, section 4 part 2, it gives a usage of って that is the same as your
second example.

（た、だ、からなどに付いて）譲歩を表す。ても、でも。たところで、だとしても

(attached after ta, da, kara etc.) To show compromise. means temo, demo, ta
dokoro de, da toshidemo
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> 見えなくなっていって

見える dictionary form of verb -- 'to be visible'.

見えない negation of dictionary form -- 'to be not visible'.

見えなく continuative form of 見えない. This form is needed when preceeding なる (to
become).

見えなくなる 'to become not visible'. Another example -- 暑い + なる --> 暑くなる = become
hot.

なって te-form of なる -- 'become ...'.

なっていって -- なる + te-form of いく -- 'start becoming ...'. See [this
link](https://japanese.stackexchange.com/questions/676/difference-
between-%E3%81%A6%E3%81%84%E3%81%8F-and-%E3%81%A6%E3%81%8F%E3%82%8B).

見えなくなっていって 'start to become not visible' = 'start to disappear ...'

> my question is exactly what なく means.

In summary, it's the continuative form of ない which is needed when you want to
say that something becomes something. For an i-adjective or ない replace the
final い with く and then add なる.

> 会えなくなったって

会う dictionary form of verb -- 'to meet'.

会える potential form -- 'to be able to meet'.

会えない negation of potential form -- 'to be unable to meet'.

会えなくなる just like above -- 'to become unable to meet'.

会えなくなったって ' even if we'll become unable to meet. This 'even if' form is made
by converting the verb into past tense and adding って i.e. なる --> なった -->
なったって. See [this link](https://japanese.stackexchange.com/questions/27715/can-
you-use-adjective-%E3%81%9F%E3%81%A3%E3%81%A6).
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