Is Mina a layer 1?

Could you please clarify for me if Mina qualifies as a layer 1? I've been reading about various blockchain protocols and it seems that the term "layer 1" is often used to describe the underlying infrastructure or main blockchain of a given network. Given Mina's unique characteristics and its position in the crypto ecosystem, I'm not entirely sure if it fits into this category. Could you elaborate on this, and if Mina isn't a layer 1, what would you classify it as? Your insights would be greatly appreciated.