Digital Euro (ecb.europa.eu)

Seems really interesting given that the claim "We would never have access to or store your personal data" and that you can make "offline payments" like cash.

At first I thought it would work like a bank account but it seems it will work a bit like a cryptocurrency?

The offline payment in particular I have no idea how it will be dlne.

It will be complementary until it won't be anymore. Fiat is not built to last, but a digital currency can last forever.

When I deposit a physical euro in my bank account, it already becomes a digital euro. What am I missing from this?

How can they prevent double spending of digital currency in offline transactions? Or is it not about preventing, but inevitability of detection and legal consequences, as they will somehow identify the wallet holder who did it?