Set up helpers, mostly okay. Some changes yet to come

main/style/style.tex

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+
+% Global style configs for tcolorbox (to reduce bloat)
+\newcommand{\usetcolorboxes}{
+    \tcbset{
+        mainboxstyle/.style={
+            arc=3mm,
+            colback=red!5!white,
+            colframe=red!75!black,
+            colbacktitle=red!75!black,
+            fonttitle=\bfseries,
+            enhanced,
+            attach boxed title to top left={yshift=-2mm,xshift=5mm},
+            breakable,
+            top=0.4cm,
+        }
+    }
+    \tikzset{
+        overlaystyle/.style={
+            draw=red!75!black,
+            thick,
+            fill=red!75!black,
+            left,
+            anchor=east,
+            text=white,
+            rounded corners=1mm,
+            font=\bfseries,
+            xshift=-5mm,
+            yshift=1mm,
+            inner xsep=3mm,
+            inner ysep=1.5mm
+        }
+    }
+}
+
+% -------------------- %
+% Small style elements %
+% -------------------- %
+\renewcommand{\footrulewidth}{0.4pt}
+\newcommand{\TODO}{\color{red} \hl{TODO:} \color{black}}
+
+% Add a color shade (similar to \fhlc, but nicer boxes)
+\newcommand{\shade}[2]{
+    \tcbox[on line, 
+        boxsep=3pt, 
+        left=0pt,
+        right=0pt,
+        top=0pt,
+        bottom=0pt,
+        colframe=white,
+        colback=#1!20!white,
+        highlight math style={enhanced}
+    ] {\textbf{#2}}
+}
+
+% Add a gray backdrop
+\newcommand{\backdrop}[1]{
+    \shade{black}{#1}
+}
+
+
+% Fancy highlighting (Bold, underlined, colorbox behind it. Shorthand for \fhlc{white}{#1}
+\newcommand{\fhl}[1]{\fhlc{white}{#1}}
+
+% Add a colorbox around your text with the color specified. Text is bold and underlined
+\newcommand{\fhlc}[2]{\textbf{\underline{\colorbox{#1}{#2}}}}
+
+
+% ----------------- %
+% Table of contents %
+% ----------------- %
+
+% Print a table of contents as a tcolorbox
+\newcommand{\printtoc}[1]{
+    \renewcommand{\cfttoctitlefont}{}
+    \renewcommand{\cftaftertoctitle}{\vspace{-0.75cm}}
+    \renewcommand{\contentsname}{}
+    \begin{tcolorbox}[colback=black!5!white,colbacktitle=#1!75!black,coltitle=black,enhanced,attach boxed title to top center={yshift=-2mm},
+        title={\Large \ifnum\value{lang}<2{Contents}\else {Inhaltsverzeichnis}\fi},fonttitle=\bfseries,breakable]
+        \hspace{1cm}
+        \tableofcontents
+    \end{tcolorbox}
+}