Which country has Proton Mail?

I'm curious to know, which country is home to the popular encrypted email service, Proton Mail? I've heard a lot about its commitment to privacy and security, but I'm not sure where exactly it's based. Is it located in a jurisdiction known for its strong data protection laws, or perhaps somewhere with a more neutral stance on digital privacy? I'd love to get a clear answer to this question, as it would help me understand the context and legal framework within which Proton Mail operates.