Another TIC TAC TOE HTML,CSS,JS

Here is my first post, I am now revisiting my client side java script project which is about TIC TAC TOE
You can play the game here : https://sriramank1988.github.io/
Before you click the link and start playing, I am particularly interested to receive feedback, suggestion on
You Vs Computer (Hard) part of the game.

It currently works on the following logic.

I am aware that MIN-MAX algorithm can be used to make the game harder, but i want to leave this project with a bit of human touch rather than fancy algorithm.