How do you share finances with your partner?

My wife and I have our own accounts and a joint one. Since almost everything important goes out of my account, only my wife transfers it to the joint account and we use it to pay for everything we need for food and joint purchases through the account. If I have paid more than average in a month, I also transfer money from the joint account to my account. It's all a bit complicated. How do you solve this? And calculate the ratio according to income, who has how much