\documentclass[a4paper, 12pt]{extarticle}

% ====== Math ======
\usepackage{amsmath} % Math stuff
\usepackage{amssymb}
\usepackage{mathspec}

% ====== List ======
\usepackage{enumitem}
\usepackage{etoolbox}
\setlist{nosep, topsep=-10pt} % Remove sep-s beetween list elements
\setlist[enumerate]{label*=\arabic*.}
\setlist[enumerate,1]{after=\vspace{0.5\baselineskip}}
\setlist[itemize,1]{after=\vspace{0.5\baselineskip}}

\AtBeginEnvironment{itemize}{%
  \setlist[enumerate]{label=\arabic*.}
  \setlist[enumerate,1]{after=\vspace{0\baselineskip}}
}

\providecommand{\tightlist}{%
  \setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}

% ====== Link ======

\usepackage{xcolor}
\usepackage{hyperref} % Links
\hypersetup{
  colorlinks=true,
  citecolor=blue,
  filecolor=blue,
  linkcolor=blue,
  urlcolor=blue,
}

% Linebreaks for urls
\expandafter\def\expandafter\UrlBreaks\expandafter{\UrlBreaks%  save the current one
  \do\a\do\b\do\c\do\d\do\e\do\f\do\g\do\h\do\i\do\j%
  \do\k\do\l\do\m\do\n\do\o\do\p\do\q\do\r\do\s\do\t%
  \do\u\do\v\do\w\do\x\do\y\do\z\do\A\do\B\do\C\do\D%
  \do\E\do\F\do\G\do\H\do\I\do\J\do\K\do\L\do\M\do\N%
  \do\O\do\P\do\Q\do\R\do\S\do\T\do\U\do\V\do\W\do\X%
  \do\Y\do\Z}

% ====== Captions ======
% TODO

% ====== Table ======
\usepackage{array}
\usepackage{booktabs}
\usepackage{longtable}
\usepackage{multirow}
\usepackage{calc}

% ====== Images ======
\usepackage{graphicx} % Pictures

\makeatletter
\def\maxwidth{\ifdim\Gin@nat@width>\linewidth\linewidth\else\Gin@nat@width\fi}
\def\maxheight{\ifdim\Gin@nat@height>\textheight\textheight\else\Gin@nat@height\fi}
\makeatother
% Scale images if necessary, so that they will not overflow the page
% margins by default, and it is still possible to overwrite the defaults
% using explicit options in \includegraphics[width, height, ...]{}
\setkeys{Gin}{width=\maxwidth,height=\maxheight,keepaspectratio}
% Set default figure placement to htbp
\makeatletter
\def\fps@figure{htbp}
\makeatother

\newcommand{\noimage}{%
  \setlength{\fboxsep}{-\fboxrule}%
  \fbox{\phantom{\rule{150pt}{100pt}}}% Framed box
}

\makeatletter
\patchcmd{\Gin@ii}
  {\begingroup}% <search>
  {\begingroup\renewcommand{\@latex@error}[2]{\noimage}}% <replace>
  {}% <success>
  {}% <failure>
\makeatother
% ====== Misc ======
\usepackage{fancyvrb}

\usepackage{csquotes}

\usepackage[normalem]{ulem}

% Quotes and verses style
\AtBeginEnvironment{quote}{\singlespacing}
\AtBeginEnvironment{verse}{\singlespacing}

% ====== Text spacing ======
\usepackage{setspace} % String spacing
\onehalfspacing{}

\usepackage{indentfirst}
\setlength\parindent{0cm}
\setlength\parskip{6pt}

% ====== Page layout ======
\usepackage[ % Margins
left=2cm,
right=2cm,
top=2cm,
bottom=2cm
]{geometry}

% ====== Document sectioning ======
\usepackage{titlesec}

\titleformat*{\section}{\bfseries}
\titleformat*{\subsection}{\bfseries}
\titleformat*{\subsubsection}{\bfseries}
\titleformat*{\paragraph}{\bfseries}
\titleformat*{\subparagraph}{\bfseries\itshape}% chktex 6

\titlespacing*{\section}{0cm}{12pt}{3pt}
\titlespacing*{\subsection}{0cm}{12pt}{3pt}
\titlespacing*{\subsubsection}{0cm}{12pt}{0pt}
\titlespacing*{\paragraph}{0pt}{6pt}{6pt}
\titlespacing*{\subparagraph}{0pt}{6pt}{3pt}

\makeatletter
\providecommand{\subtitle}[1]{
  \apptocmd{\@title}{\par {\large #1 \par}}{}{}
}
\makeatother

% ====== Pandoc =======
$if(highlighting-macros)$
$highlighting-macros$
$endif$

% ====== Language ======
\usepackage{polyglossia}
\setdefaultlanguage{$main-lang$}
\setotherlanguage{$other-lang$}
\defaultfontfeatures{Ligatures={TeX}}
\setmainfont{Open Sans}
\newfontfamily\cyrillicfont{Open Sans}

\setmonofont[Scale=0.9]{DejaVu Sans Mono}
\newfontfamily{\cyrillicfonttt}{DejaVu Sans Mono}[Scale=0.8]

\usepackage{bidi}

\usepackage{microtype}
\setlength{\emergencystretch}{3pt}

$if(title)$
\title{$title$}
$endif$
$if(subtitle)$
\subtitle{$subtitle$}
$endif$

$if(author)$
\author{$for(author)$$author$$sep$ \and $endfor$}
$endif$
$if(date)$
\date{$date$}
$endif$

\begin{document}
\maketitle{}

$body$
\end{document}