% Modified Beamer Style sheet for Xethru publications
% Created by: Lieuwe B. Leene 2020 Jan

\mode<presentation>

\newif\ifbeamer@secheader
\beamer@secheaderfalse
\DeclareOptionBeamer{secheader}{\beamer@secheadertrue}
\ProcessOptionsBeamer
\useoutertheme{xethru}

% color definitions
\definecolor{xethrublack}{RGB}{20,0,20}
\definecolor{xethruwhite}{RGB}{255,240,255}
\definecolor{xethrusecondary}{RGB}{10,10,40}

% footer styling
\setbeamerfont{footnote}{size=\scriptsize}
\setbeamercolor{footnote}{fg=white,bg=xethrusecondary}

% set the title color
\setbeamercolor{title}{fg=xethruwhite}
\setbeamerfont{title}{size=\LARGE}
\setbeamercolor{author}{fg=xethruwhite}
\setbeamerfont{author}{size=\normalsize}
\setbeamercolor{institute}{fg=xethruwhite}
\setbeamerfont{institute}{size=\normalsize}

% set colors for specific elements
\setbeamercolor{block}{fg=xethrublack}
\setbeamercolor{block title}{fg=xethrublack} % adjust title color to poppy
\setbeamercolor{block item}{fg=xethrublack}
\setbeamercolor{itemize item}{fg=xethrublack} % adjusts the bullet color

% frame title styling
\setbeamertemplate{frametitle}{\vspace{1.5em} \color{xethrublack} \insertframetitle}
\setbeamerfont{frametitle}{size=\LARGE,series=\bfseries}

% frame content styling
\setbeamersize{text margin left=1.5em,text margin right=3em}

%define first bullet symbol
\usesubitemizeitemtemplate{%
    \tiny\raise1.5pt\hbox{\color{xethrusecondary}$\circ$}%
}

%define second bullet symbol
\usesubsubitemizeitemtemplate{%
    \tiny\raise1.5pt\hbox{\color{xethrusecondary}$\blacktriangleright$}%
}

\ifbeamer@secheader\else\setbeamertemplate{headline}[default]\fi

\mode
<all>