% talkthemeMirage.sty v1.2 2026/08/27
% by LianTze Lim (liantze@gmail.com)
% An ltx-talk theme inspired by Zhou Shen's `Mirage' song poster
\ProvidesPackage{talkthemeMirage}
\newif\ifMirage@light
\DeclareOption{light}{\Mirage@lighttrue}
\DeclareOption{dark}{\Mirage@lightfalse}
\DeclareOption*{
  \PackageWarning{talkthemeMerage}{Unknown option `\CurrentOption'}
}
\ExecuteOptions{dark}
\ProcessOptions*\relax

\RequirePackage{relsize}
\RequirePackage[fixed]{fontawesome7}
\RequirePackage[blocks,rounded,titlepage=false]{talkthemetcolorbox}

\geometry{top=2cm}

\definecolor{MirageGray0}{RGB}{30,30,30}
\definecolor{MirageGray1}{RGB}{48,48,48}
\definecolor{MirageGray2}{RGB}{140,140,140}
\definecolor{MirageGray3}{RGB}{60,66,71}
\definecolor{MiragePink}{RGB}{212,183,183}
\definecolor{MirageBlue}{RGB}{156,185,220}

\ifMirage@light
  \colorlet{mirage@fg}{MirageGray3}
  \colorlet{mirage@bg}{white}
  \colorlet{mirage@structure}{MirageBlue!80!MirageGray0}
  \colorlet{mirage@alert}{MiragePink!60!red!80!MirageGray0}
  \colorlet{mirage@item}{MirageBlue!50!MirageGray0}
  \colorlet{mirage@blockbody@bg}{MirageBlue!90}
  \colorlet{mirage@blockbody@fg}{MirageBlue!40!black}
  \colorlet{mirage@blocktitlealert@bg}{MiragePink!80}
  \colorlet{mirage@pullquote}{MiragePink!90!mirage@fg}
\else
  \colorlet{mirage@fg}{white}
  \colorlet{mirage@bg}{MirageGray3}
  \colorlet{mirage@structure}{MirageBlue}
  \colorlet{mirage@alert}{MiragePink!55!red!100!MirageGray0}
  \colorlet{mirage@item}{MirageBlue!70!MirageGray0}
  \colorlet{mirage@blockbody@bg}{MirageBlue!40!black}
  \colorlet{mirage@blockbody@fg}{MirageBlue}
  \colorlet{mirage@blocktitlealert@bg}{MiragePink}
  \colorlet{mirage@pullquote}{MiragePink}
\fi

\colorlet{structure}{mirage@structure}
\colorlet{alert}{mirage@alert}
\colorlet{mirage@blocktitle@bg}{MirageBlue!30!black}
\colorlet{mirage@blocktitle@fg}{MirageBlue!90}
\colorlet{mirage@blockbodyexample@bg}{MirageBlue!40}
\colorlet{mirage@blockbodyexample@fg}{MirageGray3}
\colorlet{mirage@blocktitleexample@bg}{MirageBlue!90}
\colorlet{mirage@blocktitleexample@fg}{MirageBlue!30!black}
\colorlet{mirage@blockbodyalert@bg}{MiragePink!40}
\colorlet{mirage@blockbodyalert@fg}{MirageGray3}
\colorlet{mirage@blocktitlealert@fg}{MiragePink!60!red!80!MirageGray0}
\colorlet{mirage@headfoot}{mirage@structure!80}

\color{mirage@fg}
\pagecolor{mirage@bg}

\ifMirage@light
  \pgfdeclareverticalshading{mirage@headdivfade}{\the\paperwidth}{%
    color(0ex)=(white);%
    color(0.2ex)=(MirageBlue);%
    color(1.3ex)=(MiragePink);%
    color(1.7ex)=(white)%
  }
\else
  \pgfdeclareverticalshading{mirage@headdivfade}{\the\paperwidth}{%
    color(0ex)=(MirageGray0);%
    color(0.2ex)=(MirageBlue);%
    color(1.3ex)=(MiragePink);%
    color(1.7ex)=(MirageGray1)%
  }
\fi

\usetikzlibrary{shadows}

\pgfdeclareradialshading{tikz@lib@fade@circle@50}{\pgfpointorigin}{
  color(0pt)=(pgftransparent!0); color(20bp)=(pgftransparent!0);%
  color(25bp)=(pgftransparent!100); color(80bp)=(pgftransparent!100)}
\pgfdeclarefading{circle with fuzzy edge 50 percent}{\pgfuseshading{tikz@lib@fade@circle@50}}

\newlength{\MirageGlowRadius}
\setlength{\MirageGlowRadius}{0.2ex}
\newbox{\Mirage@smalleclipse}
\savebox{\Mirage@smalleclipse}{%
  \color{mirage@fg}%
  \tikz{\node[anchor=center,circle,circular glow={fill=MiragePink,shadow scale=2.5, path fading={circle with fuzzy edge 50 percent}},draw=mirage@fg,fill=mirage@fg,outer sep=0pt,inner sep=\MirageGlowRadius](O){};%
  \draw[line width=0.1ex,draw=mirage@fg](0.3ex,0pt) -- ++(0.75\paperwidth,0pt);%
  }%
}

\begingroup%
  \selectcolormodel{gray}%
  \pgfdeclareverticalshading{beamer@headfade}{2\paperwidth}{%
    color(0ex)=(pgftransparent!100);%
    color(1.75cm)=(pgftransparent!0)%
  }%
  \pgfdeclarefading{beamer@headfademask}{\pgfuseshading{beamer@headfade}}%
\endgroup

\AddToHook{shipout/background}{%
  % \put(0pt,0pt){%
    \begin{pgfscope}%
      \pgfsetfillcolor{mirage@headfoot}%
      \pgfpathrectangle{\pgfpoint{-0.25cm}{0}}{\pgfpoint{\dimexpr\paperwidth+0.25cm}{-1.75cm}}%
      \pgfsetfading{beamer@headfademask}{}%
      \pgfusepath{fill}%
    \end{pgfscope}%
  % }%
  \put(0cm, -1cm){%
    \pgfpathrectangle{\pgfpointorigin}{\pgfpoint{\paperwidth}{1.7ex}}%
    \pgfuseshading{mirage@headdivfade}%
  }%
  \put(\paperwidth-\wd\Mirage@smalleclipse, -\paperheight+\footskip-0.5ex){%
    \usebox{\Mirage@smalleclipse}%
  }%
}

\renewcommand{\labelitemi}{\textcolor{mirage@item}{\textbullet}}
\renewcommand{\labelitemii}{\textcolor{mirage@item}{\textbullet}}
\renewcommand{\labelitemiii}{\textcolor{mirage@item}{\textbullet}}
\renewcommand{\labelenumi}{\textcolor{mirage@item}{\theenumi.}}
\renewcommand{\labelenumii}{\textcolor{mirage@item}{\theenumi.\theenumii}}
\renewcommand{\labelenumiii}{\textcolor{mirage@item}{\theenumii.\theenumiii}}

\tcbuselibrary{theorems}
\tcbset{
  block/.append style={
    colback=mirage@blockbody@bg,
    coltext=mirage@blockbody@fg,
    colbacktitle=mirage@blocktitle@bg,
    coltitle=mirage@blocktitle@fg,
    fonttitle=\rmfamily\bfseries
  },
  exampleblock/.append style={
    colback=mirage@blockbodyexample@bg,
    coltext=mirage@blockbodyexample@fg,
    colbacktitle=mirage@blocktitleexample@bg,
    coltitle=mirage@blocktitleexample@fg
  },
  alertblock/.append style={
    colback=mirage@blockbodyalert@bg,
    coltext=mirage@blockbodyalert@fg,
    colbacktitle=mirage@blocktitlealert@bg,
    coltitle=mirage@blocktitlealert@fg
  }
}

\ifdefined\addfontfeatures
  \providecommand{\lsstyle}{\addfontfeatures{LetterSpace=5}}
\else
  \RequirePackage[letterspace=50]{microtype}
\fi

\EditInstance{titlepage-element}{title}{
  font=\LARGE\bfseries\rmfamily\lsstyle,
}

\EditInstance{titlepage-element}{subtitle}{
  font=\large\bfseries\rmfamily\lsstyle,
  after-skip = 1em
}

\EditInstance{titlepage-element}{author}{
  after-skip = 0.5em
}

\EditInstance{titlepage-element}{institute}{
  after-skip = 0.5em
}

\EditInstance{header}{std}{
  left-hspace = 1em
}

\EditInstance{footer}{std}{
  element-order = {framenumber},
  color = mirage@headfoot,
  font = \scriptsize,
  left-hspace = \dimexpr\paperwidth-3em\relax,
  right-hspace = 0.5em
}

\newcommand\@shortframenumber{%
  \hfill\arabic{frame} of \RefProperty{lastpage}{totalframes}%
}

\newcommand{\MirageFrametitlePrefix}{\faBorderTopLeft}
\EditInstance{frametitle}{header}{
  font = \Large\rmfamily\bfseries{\color{mirage@structure!50!mirage@bg}\relsize{-1}\MathCollectFalse\MirageFrametitlePrefix}
}

\newcommand{\MiragePullquoteOpen}{\faQuoteLeft}
\newcommand{\MiragePullquoteClose}{\faQuoteRight}

\NewTColorBox{pullquote}{ d<> O{}}{
  colback = mirage@bg,
  coltext = mirage@pullquote,
  leftrule = 0pt,
  rightrule = 0pt,
  toprule = 1.2pt,
  bottomrule = 1.2pt,
  colframe=mirage@pullquote!15!mirage@bg,
  arc=0pt,
  fontupper=\Large\rmfamily\itshape,
  before upper = {%
    \tagmcend%
    \tagstructbegin{tag=BlockQuote}%
    \tagmcbegin{}%
    \raisebox{0pt}[0pt][0pt]{%
      \tagmcend%
      \tagstructbegin{tag=Artifact}%
      \tagmcbegin{}%
      \makebox[0pt]{\color{mirage@pullquote!30!mirage@bg}\huge\hskip-1em\MiragePullquoteOpen}%
      \tagmcend%
      \tagstructend%
      \tagmcbegin{}
    }%
  },
  after lower={%
    \tagmcend%
    \tagstructend%
    \tagmcbegin{}%
  },
  #2,
  alt=<#1>{}{beamer hidden}
}