We don’t have a legend right now but will consider making one. Our VFR and IFR enroute charts are not strictly following any other style. But we hope that the charts are somewhat self-explanatory; all airspaces have a descriptive label on the border explaning the type and the relevant altitude data,and the same goes for most items in the map which often have labels or can be clicked. Our style is the same for every part of the world so as soon as you’ve figured it out it will be the same everywhere.
If there are more detailed questions I’d be happy to respond.