slides: properly set up beamer

- Install bold fonts

- Normal font weight in titles

- Workaround a metropolis bug

slides/sections/0.md

@@ -15,7 +15,7 @@ aspectratio: 169
 fontsize: 12pt
 mainfont: Fira Sans
 mainfontoptions:
-  - BoldFont=Fira Sans
+  - BoldFont=Fira Sans SemiBold
 mathfont: FiraMath-Regular
 
 references:
@@ -35,15 +35,38 @@ header-includes: |
   \definecolor{mDarkTeal}  {HTML}{020202}
   \definecolor{mLightBrown}{HTML}{C49D4A}
   \definecolor{mDarkRed}   {HTML}{92182B}
-
+  \definecolor{cyclamen}   {HTML}{92182B}
   \definecolor{green}      {HTML}{60AC39}
   \definecolor{red}        {HTML}{D73737}
   \definecolor{blue}       {HTML}{6684E1}
   \definecolor{yellow}     {HTML}{CFB017}
 
   \setbeamercolor{frametitle}{bg=mDarkRed}
-  \definecolor{cyclamen}{RGB}{146,24,43}
 
+  % no bold titles
+  \setbeamerfont{title}{series=\mdseries}
+  \setbeamerfont{section title}{series=\mdseries}
+  \setbeamerfont{frametitle}{series=\mdseries}
+
+  % workaround issue matze/mtheme#371
+  \AtBeginSection{
+    \frame[plain,c,noframenumbering]{
+      \centering
+      \begin{minipage}{22em}
+        \raggedright
+        \usebeamercolor[fg]{section title}
+        \usebeamerfont{section title}
+        \MakeUppercase{\insertsectionhead\\[-1ex]}
+        \usebeamertemplate*{progress bar in section page}
+      \end{minipage}
+      \par
+      \vspace{\baselineskip}
+    }
+  }
+
+  \setbeamercovered{transparent}
+
+  % strike macro
   \usepackage{ulem}
   \newcommand\strike{\bgroup\markoverwith{%
     \textcolor{mDarkRed}{\rule[0.5ex]{2pt}{1pt}}}\ULon}
@@ -56,37 +79,37 @@ header-includes: |
   }
 
 
-  % "thus" in formulas
+  %% math macros
+
+  % thus
   \DeclareMathOperator{\thus}{%
     \hspace{30pt} \Longrightarrow \hspace{30pt}
   }
 
-  % "thus" in text
+  % hence
   \DeclareMathOperator{\hence}{%
     \quad \longrightarrow \quad
   }
 
-  % "and" in formulas
+  % and
   \DeclareMathOperator{\et}{%
     \hspace{30pt} \wedge \hspace{30pt}
   }
 
-  % "with" in formulas
+  % with
   \DeclareMathOperator{\with}{%
   \hspace{30pt} \text{with} \hspace{30pt}
   }
 
-  % "expected" in formulas
+  % expected
   \DeclareMathOperator{\ex}{%
     ^{\text{exp}}
   }
 
-  % "observed" in formulas
+  % observed
   \DeclareMathOperator{\ob}{%
     ^{\text{obs}}
   }
-
-  \setbeamercovered{transparent}
   ```
 
 csl: ../notes/docs/bibliography.csl