Nuked by my toddler today

Ouch, sorry to hear about getting nuked. I almost did that once myself. Oh and i did let my nephew play my game once. Spent like 20 donuts on resetting buildings before I noticed it. Thought I had set it up so all donut expenditures need a confirmation but apparently not. I have been curious. During a nuke does it completely reset your game and you lose everything or does it just cram your stuff in to your inventory and you just need to place everything again?