なにも~ない (not at all / it's not that)

The frame なにも + [negative] used as an emphatic adverbial denial — 'not at all / it's not as if X / there's no need for X.' Despite なにも's lexical 'nothing' meaning, this use is adverbial, conveying mild exasperation or push-back rather than universal negation. Distinct from the universal-negation 何も~ない ('nothing'); the kana なにも signals the adverbial/emphatic use, while kanji 何も is the standard for 'nothing.'