s0artcl: adjust sizes according to specimen

See https://stratum0.org/wiki/File:CI-fonts-specimen.pdf

s0artcl.cls

@@ -26,25 +26,35 @@
 % ---
 \LoadClass{scrartcl}
 
+% --- Helper packages
+% ---
+\RequirePackage{etoolbox}
+
 % --- Page Layout
 % ---
 \RequirePackage[left=2.5cm,right=2.5cm,top=2cm,bottom=2.5cm]{geometry}
 
 % --- Default Fonts
 % ---
-\RequirePackage{yanonekaffeesatzzerohack}
 
 % Yanone Kaffeesatz ZeroHack for titles etc.
-% TODO: adjust sizes
-\setkomafont{title}{\usefont{LY1}{YanoneKaffeesatzZeroHack}{b}{n}\Huge}
-\setkomafont{section}{\usefont{LY1}{YanoneKaffeesatzZeroHack}{b}{n}\LARGE}
-\setkomafont{subsection}{\usefont{LY1}{YanoneKaffeesatzZeroHack}{m}{n}\Large}
+\RequirePackage{yanonekaffeesatzzerohack}
+\setkomafont{title}{\usefont{LY1}{YanoneKaffeesatzZeroHack}{b}{n}}
+% koma-script has an explicit \huge directly in \maketitle...
+\makeatletter
+\patchcmd{\@maketitle}{\huge}{\fontsize{24pt}{32pt}\selectfont}{}{}
+\makeatother
+\setkomafont{section}{%
+\fontsize{16pt}{24pt}\selectfont%
+\usefont{LY1}{YanoneKaffeesatzZeroHack}{b}{n}%
+}
+\setkomafont{subsection}{%
+\fontsize{13pt}{16pt}\selectfont%
+\usefont{LY1}{YanoneKaffeesatzZeroHack}{m}{n}% FIXME: use thin weight
+}
 % yanonekaffeesatzzerohack really needs a [nodefault] option...
 \renewcommand*{\encodingdefault}{OT1}
 
 % Droid for all the rest
 \RequirePackage[default]{droidsans}
 \RequirePackage[defaultmono]{droidmono}
-
-\makeatletter
-\makeatother