لِّنُخْرِجَ بِهِۦ حَبًّا وَنَبَاتًا ۝١٥ وَجَنَّـٰتٍ أَلْفَافًا ۝١٦ Why is جَنَّـٰتٍ accusative even though its visible ending has a kasrah?

Surah An-Naba — Part 2