% Copyright 2018 by Zhibo Wang
%
% This file may be distributed and/or modified
% under the LaTeX Project Public License


\definecolor{beamer@simple@color}{RGB}{12 72 66} % bluegreen
\DeclareOptionBeamer{gray}{\definecolor{beamer@simple@color}{gray}{#1}}
\DeclareOptionBeamer{rgb}{\definecolor{beamer@simple@color}{rgb}{#1}}
\DeclareOptionBeamer{RGB}[{12 72 0}]{\definecolor{beamer@simple@color}{RGB}{#1}}
\DeclareOptionBeamer{HTML}{\definecolor{beamer@simple@color}{HTML}{#1}}
\DeclareOptionBeamer{cmyk}{\definecolor{beamer@simple@color}{cmyk}{#1}}
\DeclareOptionBeamer{cmy}{\definecolor{beamer@simple@color}{cmy}{#1}}
\DeclareOptionBeamer{named}{\definecolor{beamer@simple@color}{named}{#1}}
\DeclareOptionBeamer{hsb}{\definecolor{beamer@simple@color}{hsb}{#1}}
\ProcessOptionsBeamer

% footline
% delete navigation below
\setbeamertemplate{navigation symbols}{}
% define footline
% \makeatother
\setbeamertemplate{footline}
{
  \leavevmode%
  \hbox{%
    \begin{beamercolorbox}[wd=.38\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
        \usebeamerfont{author in head/foot}\insertshortauthor
    \end{beamercolorbox}

    \begin{beamercolorbox}[wd=.62\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
        \usebeamerfont{title in head/foot}\insertshorttitle
    \end{beamercolorbox}

    % \begin{beamercolorbox}[wd=.1\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
    %     \usebeamerfont{title in head/foot}\insertframenumber{} / \inserttotalframenumber\hspace*{0ex}
    % \end{beamercolorbox}
  }

  \vskip0pt%
}
\useoutertheme{tree}
\makeatletter
\setbeamertemplate{headline}
{%
    \begin{beamercolorbox}[wd=\paperwidth,colsep=1.5pt]{upper separation line head}
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{title in head/foot}
      \usebeamerfont{title in head/foot}\insertshorttitle
      \usebeamerfont{section in head/foot}%
      \ifbeamer@tree@showhooks
        \setbox\beamer@tempbox=\hbox{\insertsectionhead}%
        \ifdim\wd\beamer@tempbox>1pt%
          \hskip2pt\raise1.9pt\hbox{\vrule width 5pt height0.4pt}%
          \hskip1pt%
        \fi%
      \else%  
        \hskip6pt%
      \fi%
      \insertsectionhead
      \usebeamerfont{subsection in head/foot}%
      \ifbeamer@tree@showhooks
        \setbox\beamer@tempbox=\hbox{\insertsubsectionhead}%
        \ifdim\wd\beamer@tempbox>1pt%
          \hskip2pt\raise1.9pt\hbox{\vrule width 5pt height0.4pt}%
          \hskip1pt%
        \fi%
      \else%  
        \hskip12pt%
      \fi%
      \insertsubsectionhead\hfill\insertframenumber/\inserttotalframenumber\hspace{0.5em}
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,colsep=1.5pt]{lower separation line head}
    \end{beamercolorbox}
}
\makeatother
% \makeatletter
% footline color
\setbeamercolor{author in head/foot}{fg=black, bg=mygrey!5!white}
\setbeamercolor{title in head/foot}{fg=black, bg=mygrey!5!white}

% item settings
\setbeamertemplate{itemize item}{$\color{beamer@simple@color}\bullet$}
\setbeamertemplate{itemize subitem}{$\color{beamer@simple@color}\bullet$}
\setbeamertemplate{enumerate items}[square]
\setbeamertemplate{section in toc}[sections numbered]
\setbeamertemplate{subsection in toc}[square]



% color definition
\definecolor{mygrey}{rgb}{0.52, 0.52, 0.51}

\setbeamercolor{structure}{fg=beamer@simple@color, bg=mygrey!10!white}
\setbeamercolor{frametitle}{fg=beamer@simple@color, bg=white}
\setbeamercolor{block title}{bg=mygrey!14!white}
\setbeamercolor{block body}{fg=black,bg=mygrey!10!white}
\setbeamercolor{block body alerted}{bg=white}
\setbeamercolor{block title alerted}{fg=beamer@simple@color,bg=white}
\setbeamercolor{alerted text}{fg=beamer@simple@color}
\setbeamerfont{block title alerted}{series=\mdseries}
\setbeamerfont{alerted text}{series=\bfseries\boldmath}
\hypersetup{colorlinks,linkcolor=,urlcolor=beamer@simple@color!80!white}
\usefonttheme[onlymath]{serif}
\setbeamerfont{frametitle}{series=\bfseries\boldmath}
\setbeamerfont{block title}{series=\bfseries\boldmath}
\setbeamerfont{title}{series=\bfseries\boldmath}
\setbeamertemplate{frametitle}{\insertframetitle\par\vskip-8pt\hrulefill} % add line under frametitle

% % metropolis
% % \definecolor{beamer@simple@color}{RGB}{35 54 58}
% % no outer theme
% \setbeamerfont{frametitle}{series=\bfseries}
% \setbeamercolor{frametitle}{fg=white, bg=beamer@simple@color}
% \setbeamerfont{block title}{series=\bfseries}
% \setbeamerfont{block title alerted}{series=\bfseries}
% \definecolor{alertcol}{RGB}{232 133 52}
% \setbeamercolor{block title alerted}{fg=alertcol,bg=white}
% \setbeamerfont{alerted text}{series=\mdseries}
% \setbeamercolor{alerted text}{fg=alertcol}
\setbeamercolor{block title}{bg=mygrey!25!white}
\setbeamercolor{block body}{fg=black,bg=mygrey!13!white}