\mode<presentation>

% Frame title
\defbeamertemplate*{frametitle}{Akatsuki}[1][]
{
\vskip1cm%
  \begin{beamercolorbox}[wd=\paperwidth,ht=1.2cm]{frametitle} 
  \begin{tikzpicture}
  \useasboundingbox[fill=mywhite](0,0) rectangle(\the\paperwidth,1.2);
  \fill[color=mygrey1] (0,0) rectangle(2.95,1.2);
  \fill[color=mypurple1] (3.05,0) rectangle(\the\paperwidth,1.2);
   \ifx\insertframesubtitle\@empty%
      {\node[anchor=west, color=mywhite, font=\large] at (3.2,0.61){\insertframetitle};}
      \else%
      {\node[anchor= west, color=mywhite, font=\large] at (3.2,0.81){\insertframetitle};%
       \node[anchor= west, color=mywhite, font=\small] at (3.2,0.41){\insertframesubtitle};}%
      \fi
  \end{tikzpicture}
  \end{beamercolorbox}
}

\mode<all>