doc/pandocincludes/titleclass.tex

\titleclass{\chapter}{top}
%\titleformat{\chapter}[display]{\huge\sffamily\bfseries}{}{0pt}{\thechapter. }
\renewcommand{\thechapter}{\Roman{chapter}}
\titleformat{\chapter}[display]{\centering\Large}{}{0pt}{%
\scshape\MakeLowercase\thechapter. \MakeLowercase}
\titleformat{name=\chapter,numberless}[display]{\centering\Large}{}{0pt}{%
\scshape\MakeLowercase}
\renewcommand{\thesection}{\arabic{section}}
\titleformat{\section}[hang]{\Large\bfseries}{}{0pt}{\thesection.~}
\titleformat{name=\section,numberless}[hang]{\Large\bfseries}{}{0pt}{}
\titleformat{\subsection}[hang]{\large\bfseries}{}{0pt}{\thesubsection.~}
\titleformat{name=\subsection,numberless}[hang]{\Large\bfseries}{}{0pt}{}
\titleformat{\subsubsection}[hang]{\bfseries}{}{0pt}{\thesubsubsection.~}
\titleformat{name=\subsubsection,numberless}[hang]{\Large\bfseries}{}{0pt}{}