\mode<presentation>

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% Frames backgrounds
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\setbeamertemplate{background}{
  \begin{tikzpicture}
  \useasboundingbox (0,0) rectangle(\the\paperwidth,\the\paperheight);
  \fill[color=main2] (0,2) rectangle (\the\paperwidth,\the\paperheight);
  \fill[color=main1] (0,0) rectangle(2.95,1.9);
  \fill[color=main0] (3.05,0) rectangle(\the\paperwidth,1.9);
  \ifnum\thepage>1\relax%
   \fill[white,opacity=1] (0,0) rectangle(\the\paperwidth,\the\paperheight);
   \fi
  \end{tikzpicture}
}



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% Title page frame
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\defbeamertemplate*{title page}{Akatsuki}[1][]
{ 
  \vskip1cm%
  % \begin{beamercolorbox}[wd=12cm,center]{}
  \begin{beamercolorbox}[wd=12cm,leftskip=1cm,sep=8pt,#1]{title page header}
    \usebeamerfont{title}\inserttitle\par%
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=12cm,leftskip=3cm,sep=8pt,#1]{title page header}
    % \usebeamerfont{title}
    {\small \insertsubtitle}\par%
  \end{beamercolorbox}%
  % \end{beamercolorbox}
  \vskip4.75cm%
  \begin{beamercolorbox}[wd=12cm,leftskip=3cm,#1]{author}
    \usebeamerfont{author}\insertauthor%
  \end{beamercolorbox}
   \vskip0.2cm%
  \begin{beamercolorbox}[wd=12cm,leftskip=3cm,#1]{date}
    \usebeamerfont{author}\insertdate%
  \end{beamercolorbox}
  \vfill
}



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% Item symbol in frames
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% All frames
\setbeamertemplate{items}[bullets]

% in ToC
\setbeamertemplate{subsection in toc}[subsections numbered arabic]