وَمِنْهَا: «كَيْفَ» لِلِاسْتِفْهَامِ حَالًا، نَحْوُ: «كَيْفَ أَنْتَ؟» أَيْ فِي أَيِّ حَالٍ أَنْتَ؟
Translation: Kayfa asks about a state, as in “How are you?”—that is, “In what state are you?”
Kayfa asks about someone’s state or manner, not a location or a time. The source paraphrases kayfa anta as “in what state are you?”