While Pakistan was effectivly destroyed (what was left was taken over by the Taliban and ended up in a similar mess to the one Afghanistan is in) India was very damaged with many of the magor cities including Dlhi, Calcutta and Mumbai destroyed among many cities. At leasr 12 mlilion Indians died in the holocaust and its aftermath. Proving, if proof were needed that there can be no winners in a nuclear war even if one side wins a technical victory as India did.
Mind you it was apparently Pakistan that stared the nuclear war by firing a nuclear shell which destroyed the 1st Indian armoured Divisiom which had broken through Pakistani lines and was leading the charge to Islamabad. How things escalated from that is very unclear as the leading military/political leaders on both sides were klled in the exchange or its immediate aftermath. Some just disappared and have not been seen o heard from since the war and so are presumed dead as it has been more than ten years since the war "ended"
I say "ended" because no peace treaty was ever signed due to the loss of the political and military commanders on both sides and the effective collapse of both countries in the aftermath. Disorganised combt coninued for a few weeks after the exchange before what remained of the Indian and Pakistani militaries decided it was futile and disbanded themselves.