% Copyright (C) 2016-2025 by Paul Gaborit
% -----------------------------------
%
% This work may be distributed and/or modified under the conditions of
% the LaTeX Project Public License, either version 1.3 of this license
% or (at your option) any later version.  The latest version of this
% license is in
%
% <http://www.latex-project.org/lppl.txt>
%
% and version 1.3 or later is part of all distributions of LaTeX version
% 2005/12/01 or later.
% 
% This work has the LPPL maintenance status “maintained”.
% 
% The Current Maintainer of this work is Paul Gaborit.
%
\def\BTA@version{v1.5}
\def\BTA@date{2025/04/07}
\ProvidesPackage{beamerthemeAlbi}[\BTA@date\space\BTA@version\space Albi beamer theme]

% required packages
\RequirePackage{pgfopts}
\RequirePackage{etoolbox}
\RequirePackage{tikz}
\usetikzlibrary{calc,backgrounds,fit}

% albi keys use /BTA family
\pgfkeys{/BTA/.is family}
\NewDocumentCommand\Albikeys{m}{\pgfkeys{/BTA,#1}}

% ------------------------------------------------------------
% package options
%------------------------------------------------------------

\newbool{BTA@compact@footline}
\newbool{BTA@compact@title}
\newbool{BTA@partpage}
\newbool{BTA@sectionpage}

\Albikeys{
  % option to get compact footline
  compactfootline/.is choice,
  compactfootline/.default=true,
  compactfootline/true/.code={%
     \booltrue{BTA@compact@footline}%
     \setbeamerfont*{footline}{size=\Tiny}
  },
  compactfootline/false/.code={%
     \boolfalse{BTA@compact@footline}%
     \setbeamerfont*{footline}{size=\tiny}
  },
  % option to get compact title
  compacttitle/.is choice,
  compacttitle/.default=true,
  compacttitle/true/.code={%
    \booltrue{BTA@compact@title}%
    \def\frameminheight{1.5em}
  },
  compacttitle/false/.code={%
    \boolfalse{BTA@compact@title}%
    \def\frameminheight{3em}
  },
  % options to add part pages and section pages
  partpage/.is if={BTA@partpage},
  sectionpage/.is if={BTA@sectionpage},
  % compress headline
  compress/.is if={beamer@compress},
  % unknown options
  .unknown/.code={
    \PackageError{beamer-theme-albi}{Unknown option '\pgfkeyscurrentname'!}
  },
}

\Albikeys{
  % initial values
  compactfootline=false,
  compacttitle=false,
  partpage=true,
  sectionpage=true,
}

\ProcessPgfPackageOptions{/BTA}

\Albikeys{
  .unknown/.code={
    \PackageError{beamer-theme-albi}{Unknown \string\AlbiKeys\space key '\pgfkeyscurrentname'!}
  },
}

% ------------------------------------------------------------
% useful tikz style
% ------------------------------------------------------------
\tikzset{
  fix node/.style={
    execute at begin node=\vphantom{Ég},
    execute at end node=\vphantom{Ég},
  },
}

% ------------------------------------------------------------
% specific colors
% ------------------------------------------------------------

\mode
<all>

% specific colors
\definecolor{albi blue}{RGB}{0,20,137}
\definecolor{albi dark blue}{RGB}{12,35,64}
\definecolor{albi black}{RGB}{60,60,60}
\definecolor{albi gray}{RGB}{92,102,112}
\definecolor{albi silver}{RGB}{217,225,226}
\definecolor{albi orange}{RGB}{239,125,0}
\definecolor{albi red}{RGB}{200,50,50}
\definecolor{albi yellow}{RGB}{245,219,55}
\definecolor{albi cyan}{RGB}{0,184,222}
\definecolor{albi green}{RGB}{46,125,47}

\mode
<presentation>

% beamer colors from specific colors
\setbeamercolor{albi blue}{fg=albi blue,bg=white}
\setbeamercolor{albi dark blue}{fg=albi dark blue,bg=white}
\setbeamercolor{albi black}{fg=albi black,bg=white}
\setbeamercolor{albi gray}{fg=albi gray,bg=white}
\setbeamercolor{albi silver}{fg=albi silver,bg=black}
\setbeamercolor{albi orange}{fg=albi orange,bg=white}
\setbeamercolor{albi red}{fg=albi red,bg=white}
\setbeamercolor{albi yellow}{fg=albi yellow,bg=black}
\setbeamercolor{albi cyan}{fg=albi cyan,bg=white}
\setbeamercolor{albi green}{fg=albi green,bg=white}

% beamer colors of elements
\setbeamercolor{structure}{fg=,bg=}
\setbeamercolor{normal text}{fg=albi black,bg=white}
\setbeamercolor{alerted text}{parent=normal text,fg=albi orange,bg=normal text.bg}

\setbeamercolor{section number}{use=alerted text,fg=alerted text.bg,bg=alerted text.fg}
\setbeamercolor{section number shaded}{use=section number,bg=section number.bg!50!section number.fg,fg=section number.fg}

\setbeamercolor{section in toc shaded}{parent=alerted text,fg=alerted text.fg!50!alerted text.bg}
\setbeamercolor{section in toc}{parent=alerted text}

\setbeamercolor{frame number}{use=albi orange,fg=albi orange.fg}
\setbeamercolor{frametitle}{fg=albi black,bg=albi silver}

\setbeamercolor{item projected}{use=alerted text,fg=alerted text.bg,bg=alerted text.fg}
\setbeamercolor{item}{use=alerted text,fg=alerted text.fg}
\setbeamercolor{subitem}{use=alerted text,fg=alerted text.fg}
\setbeamercolor{subsubitem}{use=alerted text,fg=alerted text.fg}

\setbeamercolor{block title alerted}{use={normal text,alerted text},fg=alerted text.fg,bg=alerted text.fg!20!normal text.bg}
\setbeamercolor{block body alerted}{use={normal text,alerted text},bg=alerted text.fg!10!normal text.bg,fg=alerted text.fg!50!normal text.fg}

\setbeamercolor{block}{parent=normal text,fg=albi blue,bg=albi blue!20!normal text.bg}
\setbeamercolor{block title}{parent=block}
\setbeamercolor{block body}{use={normal text,block},fg=block.fg!50!normal text.fg,bg=block.bg!50!normal text.bg}

\setbeamercolor{example}{parent=normal text,fg=albi green,bg=albi green!20!normal text.bg}
\setbeamercolor{block title example}{parent=example}
\setbeamercolor{block body example}{use={normal text,example},fg=example.fg!50!normal text.fg,bg=example.bg!50!normal text.bg}


\setbeamercolor{button border}{fg=albi blue}
\setbeamercolor{button}{fg=albi black,bg=albi gray}

% ------------------------------------------------------------
% inner theme
% ------------------------------------------------------------
\useinnertheme{rectangles}

% ------------------------------------------------------------
% new font size macros
% ------------------------------------------------------------

\Albikeys{
  size/.cd,
  % to define new size command
  defsize/.code n args={3}{\NewDocumentCommand#1{}{\@setfontsize#1{#2}{#3}}},
  % define \semitiny and \HUGE
  size/.is choice,
  size/size8.clo/.style={defsize={\semitiny}{5}{6},defsize={\HUGE}{22}{25}},
  size/size9.clo/.style={defsize={\semitiny}{5.5}{6.5},defsize={\HUGE}{22}{25}},
  size/size10.clo/.style={defsize={\semitiny}{6}{7},defsize={\HUGE}{32}{38}},
  size/size11.clo/.style={defsize={\semitiny}{7}{8},defsize={\HUGE}{32}{38}},
  size/size12.clo/.style={defsize={\semitiny}{7}{8},defsize={\HUGE}{32}{38}},
  size/size14.clo/.style={defsize={\semitiny}{7}{8},defsize={\HUGE}{42}{50}},
  size/size17.clo/.style={defsize={\semitiny}{9}{10},defsize={\HUGE}{48}{57}},
  size/size20.clo/.style={defsize={\semitiny}{11}{12.5},defsize={\HUGE}{58}{65}},
  size/.expanded=\beamer@size,
  %
}


% ------------------------------------------------------------
% misc
% ------------------------------------------------------------
%\setbeamerfont{alerted text}{series=\bfseries}
\setbeamerfont{description item}{series=\mdseries}

\defbeamertemplate{background canvas}{albi}{}

% new option for short texts
\define@key{beamerst}{raggedleft}[true]{\def\beamer@stalign{\raggedleft}}

% ------------------------------------------------------------
% main logo
% ------------------------------------------------------------
\setbeamertemplate{part logo}{}
\setbeamertemplate{section logo}{}
\setbeamertemplate{footline logo}{}
\newbox\BTA@box

\Albikeys{
  @define generic logo lengths/.code={% logo@beamer@template
    \ifcslength{BTA@#1@height}{}{\ExpandArgs{e}\newlength{\csname BTA@#1@height\endcsname}}
    \ifcslength{BTA@#1@depth}{}{\ExpandArgs{e}\newlength{\csname BTA@#1@depth\endcsname}}
    \ifcslength{BTA@#1@width}{}{\ExpandArgs{e}\newlength{\csname BTA@#1@width\endcsname}}
  },
  @set generic logo template/.code n args={3}{% logo beamer template, logo@beamer@template, material
    \setbeamertemplate{#1}{#3}
    \ifbeamertemplateempty{#1}{%
      \setlength{\csname BTA@#2@height\endcsname}{0pt}%
      \setlength{\csname BTA@#2@depth\endcsname}{0pt}%
      \setlength{\csname BTA@#2@width\endcsname}{0pt}%
    }{
      \savebox\BTA@box{\usebeamertemplate***{#1}}
      \settoheight{\csname BTA@#2@height\endcsname}{\usebox\BTA@box}%
      \settodepth{\csname BTA@#2@depth\endcsname}{\usebox\BTA@box}%
      \settowidth{\csname BTA@#2@width\endcsname}{\usebox\BTA@box}%
    }%
  },
  @generic logo/.style n args={3}{% logo beamer template, logo@beamer@template, material
    @define generic logo lengths={#2},
    @set generic logo template={#1}{#2}{#3},
  },
  % 
  logo/.style={@generic logo={logo}{logo}{#1}},
  part logo/.style={@generic logo={part logo}{part@logo}{#1}},
  section logo/.style={@generic logo={section logo}{section@logo}{#1}},
  footline logo/.style={@generic logo={footline logo}{footline@logo}{#1}},
  % 
  all logos/.style={
    logo={#1},
    part logo={#1},
    section logo={#1},
    footline logo={#1},
  },
  % initial value
  logo={},
}

\NewDocumentCommand\Albisetlogofilename{m}{\Albikeys{all logos={\includegraphics{#1}}}}

\RenewDocumentCommand\logo{m}{\Albikeys{all logos={#1}}}

% ------------------------------------------------------------
% Other logos list
% ------------------------------------------------------------
\Albikeys{
  other logos list/.code={%
    \def\BTA@list@of@logos{#1}%
  },
  % initial value
  other logos list={},
}

\NewDocumentCommand\Albiotherlogoslist{m}{\Albikeys{other logos list={#1}}}

% ------------------------------------------------------------
% footline
% ------------------------------------------------------------

\setbeamercolor{footline}{fg=black,bg=albi silver}
\setbeamercolor{author in head/foot}{parent=footline}
\setbeamercolor{date in head/foot}{parent=footline}
\setbeamercolor{title in head/foot}{parent=footline}
\setbeamercolor{institute in head/foot}{parent=footline}


\setbeamerfont{author in head/foot}{parent={footline}}
\setbeamerfont{title in head/foot}{parent={footline}}
\setbeamerfont{institute in head/foot}{parent={footline}}
\setbeamerfont{date in head/foot}{parent={footline}}

\defbeamertemplate{footline}{albi}
{%
  \begin{tikzpicture}[remember picture]
    \hypersetup{linkcolor=.}
    \ifbool{BTA@compact@footline}{
      \def\myheight{3.5mm}
      \def\mylogosep{.25mm}
    }{
      \def\myheight{5mm}
      \def\mylogosep{1mm}
    }
    % logo
    \coordinate (left) at (\Gm@lmargin,0);
    \ifbeamertemplateempty{footline logo}{}{
      \node[inner ysep=\mylogosep,inner xsep=0,anchor=west] at (left) (logo)
      {\resizebox*{!}{\myheight}{\usebeamertemplate{footline logo}}};
      \coordinate (left) at ([xshift=1mm]logo.east);
    }
    % other logos
    \coordinate (right) at (\paperwidth-\Gm@rmargin,0);
    \ifx\BTA@list@of@logos\@empty\else
      % insert other logos
      \foreach \image/\wid [count=\logn] in \BTA@list@of@logos {%
        \node[inner sep=0,anchor=east] at (right) (logosup)
        {\includegraphics[width=\wid]{\image}};
        \coordinate (right) at ([xshift=-1mm]logosup.west);
      }
    \fi
    %
    \path let
    \p1 = (left),
    \p2 = (right),
    \n1 = {(\x2 - \x1)*.5 - 1mm},
    in
    % move to
    (left)
    node[node font=\usebeamerfont*{title in head/foot},anchor=west,text width=\n1,align=flush left,inner sep=0,fix node]
    (title and date)
    {%
      \usebeamercolor[fg]{title in head/foot}\usebeamerfont*{title in head/foot}\insertshorttitle[width=\n1]\\%
      \usebeamercolor[fg]{date in head/foot}\usebeamerfont*{date in head/foot}\insertshortdate[width=\n1]%
    }
    % move to
    (right)
    node[node font=\usebeamerfont*{author in head/foot},anchor=east,text width=\n1,align=flush right,inner sep=0,fix node]
    (author and institute)
    {% 
      \usebeamercolor[fg]{author in head/foot}\usebeamerfont*{author in head/foot}\insertshortauthor[raggedleft,width=\n1]\\%
      \usebeamercolor[fg]{institute in head/foot}\usebeamerfont*{institute in head/foot}\insertshortinstitute[raggedleft,width=\n1]%
    };
    \begin{pgfonlayer}{background}
      \coordinate (a) at (0,0);
      \coordinate (b) at (\paperwidth,0);
      \node[fit=(current bounding box)(a)(b),inner sep=0](bb){};
      \begin{scope}[overlay]
        \usebeamercolor{footline}%
        \fill [fill=bg] (bb.south west) rectangle (bb.north east);
        \draw[line width=.4pt,draw=bg] (bb.north west) -- (bb.north east);
      \end{scope}
    \end{pgfonlayer}
  \end{tikzpicture}%
}

% ------------------------------------------------------------
% headline
% ------------------------------------------------------------

\setbeamercolor{section in head/foot}{use=albi dark blue,fg=albi dark blue.bg,bg=albi dark blue.fg}
\setbeamercolor{subsection in head/foot}{use=albi orange,fg=albi orange.bg,bg=albi orange.fg}
\setbeamercolor{separator in head/foot}{use={section in head/foot,subsection in head/foot},fg=subsection in head/foot.bg,bg=section in head/foot.bg}

\setbeamerfont{section in head/foot}{parent={headline},series=\bfseries}
\setbeamerfont{subsection in head/foot}{parent={headline},series=\bfseries}

\defbeamertemplate{section in head/foot}{albi}{\hfill\insertsectionhead}
\defbeamertemplate{section in head/foot shaded}{albi}{\hfill\color{fg!50!bg}\insertsectionhead}

\defbeamertemplate{section in head/foot}{albi with number}{\hfill\insertsectionheadnumber~\insertsectionhead}
\defbeamertemplate{section in head/foot shaded}{albi with number}{\hfill\color{fg!50!bg}\insertsectionheadnumber~\insertsectionhead}

\defbeamertemplate{subsection in head/foot}{albi}{\insertsubsectionhead\hfill}
\defbeamertemplate{subsection in head/foot shaded}{albi}{\color{fg!50!bg}\insertsubsectionhead\hfill}

\defbeamertemplate{subsection in head/foot}{albi with number}{\insertsectionheadnumber.\insertsubsectionheadnumber~\insertsubsectionhead\hfill}
\defbeamertemplate{subsection in head/foot shaded}{albi with number}{\color{fg!50!bg}\insertsectionheadnumber.\insertsubsectionheadnumber~\insertsubsectionhead\hfill}

\defbeamertemplate{headline}{albi}
{%
  \hypersetup{linkcolor=.}
  \ifbeamer@compress%
    % compressed headline (one line)
    \leavevmode%
    \ifnum\ifnum\beamer@subsectionmax>0 1\else\ifnum\beamer@sectionmax>0 1\else0\fi\fi=1\relax%
      % current section
      \begin{beamercolorbox}[wd=.5\paperwidth,ht=2.5ex,dp=1.125ex]{section in head/foot}%
        \hfill\bfseries\insertsection\hspace*{1mm}%
      \end{beamercolorbox}%
      % current subsection
      \begin{beamercolorbox}[wd=.5\paperwidth,ht=2.5ex,dp=1.125ex]{subsection in head/foot}%
        \hspace*{1mm}\bfseries\insertsubsection\hfill
      \end{beamercolorbox}%
    \fi%
  \else%
    % default headline
    \leavevmode%
    \@tempdimb=2.5375ex%
    \ifnum\beamer@subsectionmax<\beamer@sectionmax%
      \multiply\@tempdimb by\beamer@sectionmax%
    \else%
      \multiply\@tempdimb by\beamer@subsectionmax%
    \fi%
    \ifdim\@tempdimb>0pt%
      \advance\@tempdimb by 1.825ex%
      \@tempdimc=\dimexpr.5\paperwidth-.5\@tempdimb\relax
      % sections
      \begin{beamercolorbox}[wd=\@tempdimc,ht=\@tempdimb]{section in head/foot}%
        \vbox to\@tempdimb{\vfil\insertsectionnavigation{\@tempdimc}\vfil}%
      \end{beamercolorbox}%
      % separator
      \begin{beamercolorbox}[wd=\@tempdimb,ht=\@tempdimb]{separator in head/foot}%
        \usebeamercolor{separator in head/foot}%
        \tikz[baseline=0,line width=0,line join=bevel]{
          \path[draw=bg,fill=bg] (0,0) |- (\@tempdimb,\@tempdimb) -- cycle;
          \path[draw=fg,fill=fg] (0,0) -| (\@tempdimb,\@tempdimb) -- cycle;
        }%
      \end{beamercolorbox}%
      % subsections
      \begin{beamercolorbox}[wd=\@tempdimc,ht=\@tempdimb]{subsection in head/foot}%
        \vbox to\@tempdimb{\vfil\insertsubsectionnavigation{\@tempdimc}\vfil}%
      \end{beamercolorbox}%
    \fi%
  \fi
}

% ------------------------------------------------------------
% toc
% ------------------------------------------------------------

\setbeamerfont{section in toc}{size=\normalsize}
\setbeamerfont{subsection in toc}{size=\footnotesize}

\defbeamertemplate{section in toc}{albi}
{%
  \leavevmode%
  \hypersetup{linkcolor=.}%
  \leftskip=\dimexpr 4mm + 5mm\relax%
  \llap{%
    \usebeamerfont*{section number projected}%
    \usebeamercolor[bg]{section number}%
    \vrule width 4mm height 1.85ex depth .4ex%
    \hskip-4mm%
    \hbox to 4mm{\hfil\color{fg}\inserttocsectionnumber\hfil}%
    %\hskip-2mm%
    \hspace*{3mm}%
  }%
  \usebeamerfont*{section in toc}%
  \usebeamercolor{section in toc}%
  \vphantom{\rule{0em}{1em}}%
  \inserttocsection\par%
}

\defbeamertemplate{section in toc shaded}{albi}
{%
  \leavevmode%
  \hypersetup{linkcolor=.}%
  \leftskip=\dimexpr 4mm + 5mm\relax%
  \llap{%
    \usebeamerfont*{section number projected}%
    \usebeamercolor[bg]{section number shaded}%
    \vrule width 4mm height 1.85ex depth .4ex%
    \hskip-4mm%
    \hbox to 4mm{\hfil\color{fg}\inserttocsectionnumber\hfil}%
    %\hskip-2mm%
    \hspace*{3mm}%
  }%
  \usebeamerfont*{section in toc shaded}%
  \usebeamercolor{section in toc shaded}%
  \vphantom{\rule{0em}{1em}}%
  %\smallskip
  \inserttocsection\par%
}

\defbeamertemplate{subsection in toc}{albi}
{%
  \leavevmode%
  \hypersetup{linkcolor=.}%
  \leftskip=\dimexpr 4mm + 5mm\relax%
  \llap{%
    \usebeamerfont*{subsection number projected}%
    \usebeamercolor[bg]{section number}%
    \hspace*{3mm}%
    \vrule width 1mm height 1ex depth 0ex%
    %\hskip-2mm%
    \hspace*{3mm}%
  }%
  \usebeamerfont*{subsection in toc}%
  \usebeamercolor{subsection in toc}%
  \vphantom{\rule{0em}{1em}}%
  \inserttocsubsection\par%
}

% ------------------------------------------------------------
% itemize, enumerate
% ------------------------------------------------------------

\setbeamerfont{item projected}{size=\scriptsize}

\defbeamertemplate{itemize item}{albi}
{\raisebox{.2ex}{\hbox{\vrule width 1ex height 1ex}}}

\defbeamertemplate{itemize subitem}{albi}
{\small\raisebox{.2ex}{\hbox{\vrule width 1ex height 1ex}}}

\defbeamertemplate{itemize subsubitem}{albi}
{\small\raisebox{.2ex}{\hbox{\vrule width 1ex height 1ex}}}

\defbeamertemplate{enumerate item}{albi}
{%
  \raisebox{.2ex}{\hbox{%
    \usebeamerfont*{item projected}%
    \usebeamercolor[bg]{item projected}%
    \vrule width2.25ex height1.85ex depth.4ex%
    \hskip-2.25ex%
    \hbox to2.25ex{%
      \hfil%
      \color{fg}\insertenumlabel%
      \hfil}%
  }}%
}

\defbeamertemplate{enumerate subitem}{albi}
{%
  \raisebox{.2ex}{\hbox{%
    \usebeamerfont*{subitem projected}%
    \usebeamercolor[bg]{subitem projected}%
    \vrule width2.25ex height1.85ex depth.4ex%
    \hskip-2.25ex%
    \hbox to2.25ex{%
      \hfil%
      \color{fg}\insertsubenumlabel%
      \hfil}%
  }}%
}

\defbeamertemplate{enumerate subsubitem}{albi}
{%
  \raisebox{.2ex}{\hbox{%
    \usebeamerfont*{subsubitem projected}%
    \usebeamercolor[bg]{subsubitem projected}%
    \vrule width2.25ex height1.85ex depth.4ex%
    \hskip-2.25ex%
    \hbox to2.25ex{%
      \hfil%
      \color{fg}\insertsubsubenumlabel%
      \hfil}%
  }}%
}

\defbeamertemplate{enumerate mini template}{albi}
{%
  \raisebox{.2ex}{\hbox{%
    \usebeamerfont*{\beameritemnestingprefix item projected}%
    \usebeamercolor[bg]{\beameritemnestingprefix item projected}%
    \vrule width2.25ex height1.85ex depth.4ex%
    \hskip-2.25ex%
    \hbox to2.25ex{%
      \hfil%
      \color{fg}\insertenumlabel%
      \hfil}%
  }}%
}

% ------------------------------------------------------------
% frame number
% ------------------------------------------------------------
\def\insertslidenumberifuseful{\ifnum\insertframestartpage=\insertframeendpage\relax\else\@alph{\insertslidenumber}\fi}

\defbeamertemplate{frame number}{none}{}

\defbeamertemplate{frame number}{frame}{%
  \usebeamerfont{frame number}\insertframenumber%
}

\defbeamertemplate{frame number}{frame with total}{%
  \usebeamerfont{frame number}\insertframenumber%
  \usebeamerfont{slide number}/\inserttotalframenumber%
}

\defbeamertemplate{frame number}{frame+slide}{%
  \usebeamerfont{frame number}\insertframenumber%
  \usebeamerfont{slide number}\insertslidenumberifuseful%
}

\defbeamertemplate{frame number}{frame+slide with total}{%
  \usebeamerfont{frame number}\insertframenumber%
  \usebeamerfont{slide number}\insertslidenumberifuseful/\inserttotalframenumber%
}

\setbeamerfont{frame number}{series=\bfseries,size=\large}
\setbeamerfont{slide number}{series=\bfseries,size=\small}

% ------------------------------------------------------------
% frame title
% ------------------------------------------------------------

\setbeamerfont{frametitle}{size=\normalsize,series=\bfseries}
\setbeamerfont{framesubtitle}{size=\small,series=\bfseries}

\defbeamertemplate{frametitle}{albi}
{%
  \hypersetup{linkcolor=.}%
  \nointerlineskip%
  \noindent
  \begin{tikzpicture}[outer sep=0,inner sep=0]
    \usebeamerfont{frametitle}\usebeamercolor{frametitle}
    \tikzset{%
      frame number/.style={
        minimum height=\frameminheight,fill=bg,align=flush right,anchor=east,line width=0,
      },
      frame title/.style={
        minimum height=\frameminheight,anchor=east,text=fg,line width=0,inner sep=0,inner ysep=.2em,
        line width=0,text width=\n2,align=flush
        left,
      },
    }

    \node[frame number] (framenumber) at  (\paperwidth-\Gm@rmargin,0)
    {\usebeamercolor[fg]{frame number}\usebeamertemplate{frame number}};

    \path let
    \p1 = (framenumber.west),
    \p2 = (framenumber.east),
    \n1 = {\paperwidth - \Gm@lmargin - \Gm@rmargin - (\x2 - \x1)},
    \n2 = {\n1 - .5em}
    in ([xshift=-.5em]\p1) node[frame title]
    {%
      \usebeamerfont{frametitle}\usebeamercolor[fg]{frametitle}%
      \vphantom{É}\insertframetitle\vphantom{g}\par%
      \ifx\insertframesubtitle\@empty%
      \else%
        % \vskip-.5em%
        \usebeamerfont{framesubtitle}\usebeamercolor[fg]{framesubtitle}%
        \leavevmode\vphantom{É}\insertframesubtitle\vphantom{g}\par%
      \fi%
    };
    \begin{pgfonlayer}{background}
      \begin{scope}[overlay]
        \coordinate (a) at (0,0);
        \coordinate (b) at (\paperwidth,0);
        \node[fit=(current bounding box)(a)(b),inner sep=0](bb){};
        \fill [fill=bg]
        (bb.south west) rectangle (bb.north east);
      \end{scope}
    \end{pgfonlayer}
  \end{tikzpicture}%
}

% ------------------------------------------------------------
% title page
% ------------------------------------------------------------

\setbeamercolor{albi title page.title}{use=albi orange,fg=albi orange.bg,bg=albi orange.fg}
\setbeamercolor{albi title page.author}{use=albi cyan,fg=albi cyan.bg,bg=albi cyan.fg}
\setbeamercolor{albi title page.empty}{use=albi dark blue,fg=albi dark blue.bg,bg=albi dark blue.fg}
\setbeamercolor{albi title page.logo}{fg=black,bg=white}

\setbeamerfont{title}{series=\bfseries,size=\LARGE}
\setbeamerfont{author}{series=\bfseries,size=\large}

\defbeamertemplate{title page}{albi}
{%
  \begin{tikzpicture}[overlay,remember picture,shift={(current
        page.north west)}]

    \IfPackageLoadedTF{babel}{\ifbabelshorthand{!}{\shorthandoff*{!}}{}}{}

    % coordinates
    \path
    coordinate (p1) at ({.8*\paperheight},0) 
    %coordinate (p2) at ({\paperwidth-.4*\paperheight},{-1*\paperheight}) 
    coordinate (p2) at ({.9*\paperheight},{-1*\paperheight}) 
    coordinate (p3) at (0,{-.8*\paperheight})
    coordinate (p4) at ($(p1)!(p2)!(p3)$) 
    coordinate (se) at (current page.south east)
    coordinate (p5) at ($(se)+([rotate=90]$(se)-(p2)$)$)
    coordinate (p6) at ($(p1)!.6!(p4)$)
    coordinate (p7) at (p6 |- p4)
    ;

    % triangles
    \usebeamercolor{albi title page.title}%
    \fill[fill=bg,line width=0] (p1) -- (p4) -- (p2) -- (p5) -- (current page.north east) -- cycle;
    \usebeamercolor{albi title page.author}%
    \fill[fill=bg,line width=0] (p4) -- (p3) -- (current page.south west) -- (p2) -- cycle;
    \usebeamercolor{albi title page.empty}%
    \fill[fill=bg,line width=0] (p2) -- (p5) -- (current page.south east) -- cycle;
    \usebeamercolor{albi title page.logo}%
    \fill[fill=bg,line width=0] (p1) -- (p3) -- (current page.north west) -- cycle;
    
    % logo
    \hypersetup{linkcolor=.}%
    \ifbeamertemplateempty{logo}{}{
      % le logo
      \edef\BTA@logo@ratio{
        \fpeval{(0.55 * \paperheight)/(\BTA@logo@width +\BTA@logo@depth + \BTA@logo@height)}}
      \node[anchor=north west,inner sep=0] at
      ([shift={(.1*\paperheight,-.1*\paperheight)}] 0,0)
      (logo)
      {\scalebox{\BTA@logo@ratio}{\insertlogo}};
    }
    
    % title and subtitle
    \usebeamercolor{albi title page.title}
    \path let
    \p6 = (p6),
    \n1 = {\paperwidth - \x6 - \Gm@rmargin},
    \n2 = {\n1 - 1em}
    in
    (p7) node [anchor=west,inner sep=.5em,text width=\n2,align=flush left,text=albi title page.title.fg]
    {%
      \usebeamerfont{title}\usebeamercolor[fg]{title}\inserttitle\par%
      \ifx\insertsubtitle\@empty%
      \else%
        \vskip0.5em%
        {\usebeamerfont{subtitle}\usebeamercolor[fg]{subtitle}\insertsubtitle\par}%
      \fi%
    };
    
    % author, institute, date and titlegraphic
    \usebeamercolor{albi title page.author}
    \path let
    \p7 = ($(p3)!{sqrt(2)*\Gm@lmargin}!(p4)$),
    \p4 = (p4),
    \p8 = ({\x4 + (\x4 - \x7)},\y7),
    \n1 = {(\x8 - \x7)},
    \n2 = {\n1}
    in
    (\Gm@lmargin,{-\paperheight+\Gm@lmargin})
    node [anchor=south west,inner sep=0,text width=\n2,align=flush left,text=albi title page.author.fg] (author institute)
    {%
      \usebeamerfont*{author}\usebeamercolor[fg]{author}\insertauthor\par%
      \usebeamerfont*{institute}\usebeamercolor[fg]{institute}\insertinstitute\par%
      \usebeamerfont*{date}\usebeamercolor[fg]{date}\insertdate\par%
      \usebeamercolor[fg]{titlegraphic}\inserttitlegraphic\par
    };

  \end{tikzpicture}%
}

% ------------------------------------------------------------
% customize part name and number with babel and french
% ------------------------------------------------------------
\newcommand\insertpartnameandnumber{%
  \IfPackageLoadedTF{babel}{%
    \iflanguage{french}{\partname}{\partname~\insertromanpartnumber}%
  }{%
    \partname~\insertromanpartnumber%
  }%
}

% ------------------------------------------------------------
% part page
% ------------------------------------------------------------

\setbeamercolor{albi part page.title}{use=albi cyan,fg=albi cyan.bg,bg=albi cyan.fg}
\setbeamercolor{albi part page.empty}{use=albi orange,fg=albi orange.bg,bg=albi orange.fg}
\setbeamercolor{albi part page.logo}{fg=black,bg=white}

\setbeamerfont{part name in part page}{parent=part name}
\setbeamerfont{part title in part page}{parent=part title}

\defbeamertemplate{part page}{albi}
{%
  \begin{tikzpicture}[overlay,remember picture,shift={(current page.north west)}]
    \hypersetup{linkcolor=.}%
    \IfPackageLoadedTF{babel}{\ifbabelshorthand{!}{\shorthandoff*{!}}{}}{}

    % coordinates
    \path
    coordinate (p1) at ({.8*\paperheight},{-1*\paperheight})
    coordinate (p2) at (0,{-1*\paperheight + .8*\paperheight})
    coordinate (p3) at ({.8*\paperheight},0)
    coordinate (p4) at ($(p1)!(p3)!(p2)$)
    coordinate (p5) at ($(p4)!.5!(p3)$)
    coordinate (p6) at (p5 |- p4)
    ;

    % triangles
    \usebeamercolor{albi part page.title}%
    \fill[fill=bg,line width=0] (current page.south east) -- (p1) -- (p4) -- (p3) -| cycle;
    \usebeamercolor{albi part page.empty}%
    \fill[fill=bg,line width=0] (current page.north west) -- (p3) -- (p4) -- (p2) -- cycle;
    \usebeamercolor{albi part page.logo}%
    \fill[fill=bg,line width=0] (current page.south west) -- (p2) -- (p1) -- cycle;

    % part title
    \path let
    \p6 = (p6),
    \n1 = {\paperwidth - \x6 - \Gm@rmargin},
    \n2 = {\n1 - 1em}
    in (p6)
    node[anchor=west,text width=\n2,inner sep=.5em,align=flush right] {%
      \usebeamercolor[fg]{albi part page.title}%
      %
      \usebeamerfont*{part name in part page}%
      \usebeamercolor[fg]{part name in part page}%
      \insertpartnameandnumber%
      \par%
      %
      \usebeamerfont*{part title in part page}%
      \usebeamercolor[fg]{part title in part page}%
      \insertpart%
      \par%
    };

    % logo
    \ifbeamertemplateempty{part logo}{}{
      \edef\BTA@part@logo@ratio{%
        \fpeval{(0.55 * \paperheight)/(\BTA@part@logo@width + \BTA@part@logo@depth + \BTA@part@logo@height)}}
      \node[at={(current page.south west)},shift={(.1*\paperheight,.1*\paperheight)},
        anchor=south west,inner sep=0]
      {\scalebox{\BTA@part@logo@ratio}{\usebeamertemplate***{part logo}}};
    }
  \end{tikzpicture}
}

% ------------------------------------------------------------
% section page
% ------------------------------------------------------------

\setbeamercolor{albi section page.toc}{parent=normal text}
\setbeamercolor{albi section page.part}{use=albi orange,fg=albi orange.bg,bg=albi orange.fg}
\setbeamercolor{albi section page.logo}{use=albi silver,fg=albi silver.bg,bg=albi silver.fg}

\setbeamerfont{part name in section page}{parent=part name,size=\normalsize}
\setbeamerfont{part title in section page}{parent=part title,size=\normalsize}

\defbeamertemplate{section page}{albi}
{%
  \begin{tikzpicture}[overlay,remember picture,shift={(current page.north west)}]
    \hypersetup{linkcolor=.}%
    \IfPackageLoadedTF{babel}{\ifbabelshorthand{!}{\shorthandoff*{!}}{}}{}
    \path
    coordinate (p1) at ({.8*\paperheight},{-1*\paperheight})
    coordinate (p2) at (0,{-1*\paperheight + .8*\paperheight})
    coordinate (p3) at ({.8*\paperheight},0)
    coordinate (p4) at ($(p1)!(p3)!(p2)$)
    coordinate (p5) at (0,{-.8*\paperheight})
    ;
    
    % triangles
    \usebeamercolor{albi section page.logo}
    \fill[fill=bg,line width=0]  (p1) -- (p4) -- (p5) |- cycle;
    \usebeamercolor{albi section page.part}
    \fill[fill=bg,line width=0]  (p5) -- (p3) -| cycle;
    \usebeamercolor{albi section page.toc}
    \fill[fill=bg,line width=0]  (current page.north east) -- (p3) -- (p4) -- (p1) -|  cycle;

    % logo
    \ifbeamertemplateempty{section logo}{}{
      \edef\BTA@section@logo@ratioi{
        \fpeval{(0.55 * \paperheight)/(\BTA@section@logo@width + \BTA@section@logo@depth + \BTA@section@logo@height)}}
      \edef\BTA@section@logo@ratioii{
        \fpeval{(0.15 * \paperheight)/(\BTA@section@logo@depth + \BTA@section@logo@height)}}
      \edef\BTA@section@logo@ratio{
        \fpeval{\BTA@section@logo@ratioi < \BTA@section@logo@ratioii
          ? \BTA@section@logo@ratioi : \BTA@section@logo@ratioii}}
      \node[at={(current page.south west)},shift={(.1*\paperheight,.1*\paperheight)},anchor=south west,inner sep=0]
      {\scalebox{\BTA@section@logo@ratio}{\usebeamertemplate***{section logo}}};
    }
    
    % part title 
    \ifnum\c@part>0\relax
      \node[at={(current page.north west)},shift={(.1*\paperheight,-.1*\paperheight)},
        anchor=north west,inner sep=0,text=white,text width=.3\paperwidth,align=flush left]
      {%
        \usebeamercolor[fg]{albi section page.part}
        \usebeamerfont{part name in section page}%
        \usebeamercolor[fg]{part name in section page}%
        \insertpartnameandnumber%
        \par%
        \usebeamerfont{part title in section page}%
        \usebeamercolor[fg]{part title in section page}%
        \insertpart%
        \par%
      };
    \fi
  \end{tikzpicture}

  % toc (with current section open)
  \begin{columns}
    \usebeamercolor[fg]{albi section page.toc}%
    \usebeamerfont{albi section page.toc}%
    \hypersetup{linkcolor=.}%
    \column{.8\paperheight}
    \column{\dimexpr\paperwidth-.8\paperheight-\Gm@rmargin}
    \tableofcontents[currentsection,hideothersubsections,subsubsectionstyle=hide]%
    \column{\Gm@rmargin}
  \end{columns}
}

% ------------------------------------------------------------
% activate all templates
% ------------------------------------------------------------

\setbeamertemplate{part page}[albi]
\setbeamertemplate{section page}[albi]

\setbeamertemplate{section in head/foot}[albi]
\setbeamertemplate{section in head/foot shaded}[albi]
\setbeamertemplate{subsection in head/foot}[albi]
\setbeamertemplate{subsection in head/foot shaded}[albi]
\setbeamertemplate{headline}[albi]

\setbeamertemplate{footline}[albi]

\setbeamertemplate{section in toc}[albi]
\setbeamertemplate{section in toc shaded}[albi]
\setbeamertemplate{subsection in toc}[albi]

\setbeamertemplate{background canvas}[albi]

\setbeamertemplate{title page}[albi]

\setbeamertemplate{frametitle}[albi]

\setbeamertemplate{navigation symbols}{}

\setbeamertemplate{sidebar right}{}

\setbeamertemplate{itemize item}[albi]
\setbeamertemplate{itemize subitem}[albi]
\setbeamertemplate{itemize subsubitem}[albi]

\setbeamertemplate{enumerate item}[albi]
\setbeamertemplate{enumerate subitem}[albi]
\setbeamertemplate{enumerate subsubitem}[albi]

\setbeamertemplate{enumerate mini template}[albi]

%\setbeamertemplate{frame number}[none]
%\setbeamertemplate{frame number}[frame]
%\setbeamertemplate{frame number}[frame with total]
%\setbeamertemplate{frame number}[frame+slide]
\setbeamertemplate{frame number}[frame+slide with total]

\setbeamercovered{transparent=10}

\setbeamersize{text margin left=.1\paperheight,text margin right=.1\paperheight}

% ------------------------------------------------------------
% install part pages and section pages
% ------------------------------------------------------------
\AtBeginPart{\ifbool{BTA@partpage}{\frame[plain]{\partpage}}{}}
\AtBeginSection{\ifbool{BTA@sectionpage}{\frame[plain]{\usebeamertemplate*{section page}}}{}}

\mode
<all>