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slides/theme/beamerouterthemecipher.sty

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+\ProvidesPackage{theme/beamerouterthemecipher}[2025/05/04 v1.0 Cipher Beamer Theme]
+
+% Frame title
+\defbeamertemplate*{frametitle}{cipher}{
+	\begin{beamercolorbox}[wd=\paperwidth,sep=0.5cm]{frametitle}
+		\usebeamerfont{frametitle}\insertframetitle\par%
+		\ifx\insertframesubtitle\@empty\else%
+			{\usebeamerfont{framesubtitle}\usebeamercolor[fg]{framesubtitle}\insertframesubtitle\par}%
+		\fi%
+	\end{beamercolorbox}
+}
+
+% Footline (only shown when not cover slide)
+\defbeamertemplate*{footline}{cipher}{
+	\ifnum\c@framenumber=1\else
+		\begin{beamercolorbox}[ht=2.5ex,dp=1.125ex,leftskip=0.3cm,rightskip=0.3cm]{footline}
+			\usebeamerfont{footline}\color{footline.fg!50}\inserttitle\ - \insertinstitute\hfill\insertframenumber\,/\,\inserttotalframenumber
+		\end{beamercolorbox}
+	\fi
+}
+
+% Background - can be used to add a subtle border matching the theme
+\defbeamertemplate*{background}{cipher}{
+	\begin{tikzpicture}[remember picture, overlay]
+		% Add a subtle border to all slides
+		\draw[cipheraccent, line width=3pt]
+		(current page.north west) rectangle (current page.south east);
+	\end{tikzpicture}
+}