Compact customisable class?

Is there a document class like amsart in that it has compact list’s and headings? It just needs to not be an ams class, because they have specific guidelines, and so are not very customisable. I’ve added an example of what I mean by compact lists. I don’t want to use something like savetrees, because the ams classes still look good despite taking less space and being more compact.

amsart

vs

article

Here is the code for the list (Although this is not just for lists. The ams classes make everything more compact.):

begin{enumerate}
item ALU (Arithmetic Logic Unit)
    subitem Arithmetic Operations
    subitem Logical Operations
item CU (Control Unit)
    subitem Directs electrical signals
    subitem Doesn't execute program
item AGU (Address Generation Unit)
item MMU (Memory Management Unit)
end{enumerate}

usepackage{enumitem}
setenumerate[1]{label={(arabic*) -}}
setitemize{noitemsep,topsep=0pt,parsep=0pt,partopsep=0pt}
setenumerate{noitemsep,topsep=0pt,parsep=0pt,partopsep=0pt}
renewcommandlabelitemi{--}