Is Cardano immutable?

Could you please elaborate on the immutability of Cardano? I've heard a lot about its blockchain technology and its purported security features, but I'm still unclear as to whether it truly qualifies as immutable. After all, with the ever-evolving nature of cryptography and blockchain, is there any guarantee that Cardano's immutability will hold true in the long run? I'm particularly interested in understanding how its design and architecture contribute to this aspect. Could you shed some light on this matter?