%%%%%%%%%%%%%%%%%%%%%%
%% start of file `elegantbook.cls'.
%% Copyright 2013-2019 ElegantLaTeX (elegantlatex2e@gmail.com)
%%
%% This work may be distributed and/or modified freely
%% available at https://github.com/ElegantLaTeX/ElegantBook
% 
%%%%%%%%%%%%%%%%%%%%%
% % !Mode:: "TeX:UTF-8"
\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{elegantbook}[2019/08/18 v3.09 ElegantBook document class]

\RequirePackage{kvoptions}
\RequirePackage{etoolbox}
\SetupKeyvalOptions{family=ELEGANT, prefix=ELEGANT@, setkeys=\kvsetkeys}
\newcommand{\ekv}[1]{\kvsetkeys{ELEGANT}{#1}}

% ----- Colors -----
\DeclareStringOption[blue]{color}
\DeclareStringOption[en]{lang}
\DeclareStringOption[answer]{result}
\DeclareStringOption[fancy]{mode}
\DeclareStringOption[show]{base}
\DeclareStringOption[normal]{device}
\DeclareStringOption[numbers]{cite}
\DeclareStringOption[newtxmath]{math}
\DeclareStringOption[marginfalse]{marginpar}
\DeclareStringOption[onecol]{toc}
% ----- backward compatibility
\DeclareVoidOption{green}{\ekv{color=green}}
\DeclareVoidOption{cyan}{\ekv{color=cyan}}
\DeclareVoidOption{blue}{\ekv{color=blue}}
\DeclareVoidOption{gray}{\ekv{color=gray}}
\DeclareVoidOption{black}{\ekv{color=black}}
\DeclareVoidOption{nocolor}{\ekv{color=none}}

\DeclareVoidOption{en}{\ekv{lang=en}}
\DeclareVoidOption{cn}{\ekv{lang=cn}}

\DeclareVoidOption{fancy}{\ekv{mode=fancy}}
\DeclareVoidOption{simple}{\ekv{mode=simple}}

\DeclareVoidOption{answer}{\ekv{result=answer}}
\DeclareVoidOption{noanswer}{\ekv{result=noanswer}}

\DeclareVoidOption{hide}{\ekv{base=hide}}
\DeclareVoidOption{show}{\ekv{base=show}}

\DeclareVoidOption{normal}{\ekv{device=normal}}
\DeclareVoidOption{pad}{\ekv{device=pad}}

\DeclareVoidOption{numbers}{\ekv{cite=numbers}}
\DeclareVoidOption{authoryear}{\ekv{cite=authoryear}}

\DeclareVoidOption{newtxmath}{\ekv{math=newtx}}
\DeclareVoidOption{mtpro2}{\ekv{math=mtpro2}}

\DeclareVoidOption{margintrue}{\ekv{marginpar=margintrue}}
\DeclareVoidOption{marginfalse}{\ekv{marginpar=marginfalse}}

\DeclareVoidOption{onecol}{\ekv{toc=onecol}}
\DeclareVoidOption{twocol}{\ekv{toc=twocol}}

% ----- Math option -----
\newcommand\mailto[1]{\href{mailto:#1}{\nolinkurl{#1}}}

% ----- Title Style -----
\DeclareStringOption[hang]{titlestyle}[hang]
% ----- backward compatibility
\DeclareVoidOption{hang}{\ekv{titlestyle=hang}}
\DeclareVoidOption{display}{\ekv{titlestyle=display}}
% ----- Default Options -----
\DeclareDefaultOption{\PassOptionsToClass{\CurrentOption}{book}}

\ProcessKeyvalOptions*\relax
% \ProcessOptions*\relax
\LoadClass[a4paper,oneside,openany]{book}

\RequirePackage{indentfirst,comment}
\setlength\parindent{2em}

% fontsetting
\ifdefstring{\ELEGANT@math}{mtpro2}{
\let\Bbbk\relax
\RequirePackage[lite]{mtpro2}
}{\relax}


\PassOptionsToPackage{no-math}{fontspec}
\ifdefstring{\ELEGANT@lang}{cn}{
\RequirePackage{amsmath,mathrsfs,amsfonts,amssymb}
\RequirePackage[UTF8, scheme=plain]{ctex}
}

\RequirePackage{ifxetex}



\RequirePackage{newtxtext}
\RequirePackage{anyfontsize}
\ifdefstring{\ELEGANT@math}{newtxmath}{
\RequirePackage{newtxmath}
\RequirePackage{esint}
%%% use yhmath pkg, uncomment following code
% \let\oldwidering\widering
% \let\widering\undefined
% \RequirePackage{yhmath}
% \let\widering\oldwidering

%%% use esvect pkg, uncomment following code
% \RequirePackage{esvect}
\DeclareSymbolFont{CMlargesymbols}{OMX}{cmex}{m}{n}
\let\sumop\relax\let\prodop\relax
\DeclareMathSymbol{\sumop}{\mathop}{CMlargesymbols}{"50}
\DeclareMathSymbol{\prodop}{\mathop}{CMlargesymbols}{"51}
}{\relax}

% ----- Handle Colors -----
%% 章节以及页脚图形

\RequirePackage{xcolor}
\ifdefstring{\ELEGANT@color}{green}{
	\definecolor{structurecolor}{RGB}{0,120,2}%
	\definecolor{main}{RGB}{0,120,2}%
	\definecolor{second}{RGB}{230,90,7}%
	\definecolor{third}{RGB}{0,160,152}%
}{\relax}
\ifdefstring{\ELEGANT@color}{cyan}{
	\definecolor{structurecolor}{RGB}{31,186,190}%
	\definecolor{main}{RGB}{59,180,5}%
	\definecolor{second}{RGB}{175,153,8}%
	\definecolor{third}{RGB}{244,105,102}%
}{\relax}
\ifdefstring{\ELEGANT@color}{blue}{
	\definecolor{structurecolor}{RGB}{60,113,183}
	\definecolor{main}{RGB}{0,166,82}%
	\definecolor{second}{RGB}{255,134,24}%
	\definecolor{third}{RGB}{0,174,247}%
}{\relax}
\ifdefstring{\ELEGANT@color}{gray}{
	\definecolor{structurecolor}{RGB}{150,150,150}
	\definecolor{main}{RGB}{150,150,150}%
	\definecolor{second}{RGB}{150,150,150}%
	\definecolor{third}{RGB}{150,150,150}%
}{\relax}
\ifdefstring{\ELEGANT@color}{black}{
	\definecolor{structurecolor}{RGB}{0,0,0}
	\definecolor{main}{RGB}{0,0,0}%
	\definecolor{second}{RGB}{0,0,0}%
	\definecolor{third}{RGB}{0,0,0}%
}{\relax}

%green color
	\definecolor{structure1}{RGB}{0,120,2}%
	\definecolor{main1}{RGB}{0,120,2}%
	\definecolor{second1}{RGB}{230,90,7}%
	\definecolor{third1}{RGB}{0,160,152}%
%cyan color
	\definecolor{structure2}{RGB}{31,186,190}%
	\definecolor{main2}{RGB}{59,180,5}%
	\definecolor{second2}{RGB}{175,153,8}%
	\definecolor{third2}{RGB}{244,105,102}%
%blue color
	\definecolor{structure3}{RGB}{60,113,183}
	\definecolor{main3}{RGB}{0,166,82}%
	\definecolor{second3}{RGB}{255,134,24}%
	\definecolor{third3}{RGB}{0,174,247}%
% gray color
	\definecolor{structure4}{RGB}{150,150,150}
	\definecolor{main4}{RGB}{150,150,150}%
	\definecolor{second4}{RGB}{150,150,150}%
	\definecolor{third4}{RGB}{150,150,150}%
% black color
	\definecolor{structure5}{RGB}{0,0,0}
	\definecolor{main5}{RGB}{0,0,0}%
	\definecolor{second5}{RGB}{0,0,0}%
	\definecolor{third5}{RGB}{0,0,0}%

% corlor definition
\definecolor{winered}{rgb}{0.5,0,0}
\definecolor{bule}{RGB}{18,29,57}


\newcommand{\base}[2]{%
	\nointerlineskip \vspace{0.1\baselineskip}\hspace{\fill}
	{\color{#1}
		\resizebox{0.3\linewidth}{1.5ex}
		{{%
				{\begin{tikzpicture}
					\node  (C) at (0,0) {};
					\node (D) at (4,0) {};
					\path (C) to [ornament=#2] (D);
					\end{tikzpicture}}}}}%
	\hspace{\fill}
	\par\nointerlineskip \vspace{0.1\baselineskip}
}

% ----- Title Style -----
\ifdefstring{\ELEGANT@titlestyle}{hang}{\def\style{hang}}{\relax}
\ifdefstring{\ELEGANT@titlestyle}{display}{\def\style{display}}{\relax}


\newtoks\email
\newtoks\version
\newtoks\institute
\newtoks\subtitle

\RequirePackage[sort&compress]{natbib}
\setlength{\bibsep}{0.0pt}
\def\bibfont{\footnotesize}



\RequirePackage{enumerate}
% list/itemize/enumerate setting
\RequirePackage[shortlabels,inline]{enumitem}
\setlist{nolistsep}

% caption settings 
\RequirePackage[font=small,labelfont={bf,color=structurecolor}]{caption} 
\captionsetup[table]{skip=3pt}
\captionsetup[figure]{skip=3pt}

\AtBeginDocument{
\setlength{\abovedisplayskip}{3pt}
\setlength{\belowdisplayskip}{3pt}
\setcounter{tocdepth}{1}
\RequirePackage[flushmargin]{footmisc}
\setlength{\footnotesep}{12pt}
}

\ifdefstring{\ELEGANT@toc}{twocol}{
\renewcommand{\tableofcontents}{%
\setlength{\columnsep}{2em}
%\setlength{\columnseprule}{.8pt}
\begin{multicols}{2}[\chapter*{\contentsname}]%
  \@starttoc{toc}%
\end{multicols}}
}{\relax}


%% 常用宏包
\linespread{1.3}

\RequirePackage{graphicx}
%\RequirePackage{enumerate}

\RequirePackage{booktabs}
\RequirePackage{multicol,multirow}
\RequirePackage{xcolor}
\RequirePackage{fancyvrb}
\RequirePackage{makecell,lipsum,hologo,setspace}

%%中文结构名字
\ifdefstring{\ELEGANT@lang}{cn}{
	\renewcommand{\contentsname}{目\hspace{2em}录}
	\renewcommand{\figurename}{图}
	\renewcommand{\tablename}{表}
	\renewcommand{\partname}{\color{structurecolor}}
	\renewcommand{\thepart}{第\zhnumber{\arabic{part}}部分}
	\renewcommand{\listfigurename}{插图目录}
	\renewcommand{\listtablename}{表格目录}
	\renewcommand{\bibname}{参考文献}
	\renewcommand{\appendixname}{附录}
	\renewcommand{\indexname}{索\hspace{2em}引}
	\newcommand\figref[1]{\textbf{图}~\ref{#1}}
	\newcommand\tabref[1]{\textbf{表}~\ref{#1}}
	\renewcommand{\chaptername}{第 \thechapter\,章}
	\ifdefstring{\ELEGANT@cite}{authoryear}{
		\RequirePackage[authoryear]{gbt7714}
	}{\relax}
	\ifdefstring{\ELEGANT@cite}{numbers}{
		\RequirePackage[numbers]{gbt7714}
	}{\relax}
	\ifdefstring{\ELEGANT@cite}{super}{
		\RequirePackage[super]{gbt7714}
	}{\relax}
}{\relax}
\ifdefstring{\ELEGANT@lang}{en}{
\newcommand\figref[1]{\textbf{Figure}~\ref{#1}}
\newcommand\tabref[1]{\textbf{Table}~\ref{#1}}
\renewcommand{\chaptername}{Chapter \thechapter}
\bibliographystyle{aer}
}{\relax}

\RequirePackage{xpatch}
\xpatchcmd{\part}{\thispagestyle{plain}}
      {\thispagestyle{plain}}{}{}
\xpatchcmd{\@endpart}{\vfil\newpage}{\vfil\newpage
             }{}{}
\graphicspath{{./figure/}{./figures/}{./image/}{./images/}{./graphics/}{./graphic/}{./pictures/}{./picture/}}

\RequirePackage{tikz}
\usetikzlibrary{backgrounds,calc,shadows}
\usepackage[object=vectorian]{pgfornament} %% 

\newcommand*{\eitemi}{\tikz \draw [baseline, ball color=structurecolor,draw=none] circle (2pt);}
\newcommand*{\eitemii}{\tikz \draw [baseline, fill=structurecolor,draw=none,circular drop shadow] circle (2pt);}
\newcommand*{\eitemiii}{\tikz \draw [baseline, fill=structurecolor,draw=none] circle (2pt);}
\setlist[enumerate,1]{label=\color{structurecolor}\arabic*.}
\setlist[enumerate,2]{label=\color{structurecolor}(\alph*).}
\setlist[enumerate,3]{label=\color{structurecolor}\Roman*.}
\setlist[enumerate,4]{label=\color{structurecolor}\Alph*.}
\setlist[itemize,1]{label={\eitemi}}
\setlist[itemize,2]{label={\eitemii}}
\setlist[itemize,3]{label={\eitemiii}}


%% device settings

\RequirePackage{geometry}
\ifdefstring{\ELEGANT@device}{normal}{
\geometry{
	a4paper,
	top=25.4mm, bottom=25.4mm,
	headheight=2.17cm,
	headsep=4mm,
	footskip=12mm
}
\ifdefstring{\ELEGANT@marginpar}{margintrue}{
\geometry{
	marginparwidth=5cm, marginparsep=5mm,
	left=2cm,right=7cm,
}
}{\relax}
}{\relax}

\ifdefstring{\ELEGANT@device}{pad}{
\geometry{
	paperwidth=7.5in, 
	paperheight=10in,
	margin=16mm,
	headheight=2.17cm,
	footskip=4mm
}}{\relax}

\RequirePackage{hyperref}
\hypersetup{
	breaklinks,
	unicode,
	linktoc=all,
	bookmarksnumbered=true,
	bookmarksopen=true,
	pdfkeywords={ElegantBook},
	colorlinks,
	linkcolor=winered,
	citecolor=winered,
	urlcolor  = winered,
	plainpages=false,
	pdfstartview=FitH,
	pdfborder={0 0 0},
	linktocpage
}
\let\email\relax
\newcommand\email[1]{\href{mailto:#1}{\nolinkurl{#1}}}

%%   章节设置
\RequirePackage[center,pagestyles]{titlesec}
\RequirePackage{apptools}
\RequirePackage[toc,page]{appendix}

\setcounter{secnumdepth}{5}

\titleformat{\chapter}[\style]{\bfseries}
{\filcenter\LARGE\enspace\bfseries{\color{structurecolor}\IfAppendix{\appendixname}{\chaptername}\enspace}}{1pt}{\bfseries\color{structurecolor}\LARGE\filcenter}[\ifdefstring{\ELEGANT@base}{hide}{}{\filcenter\base{structurecolor}{88}}]

\titleformat{\section}[hang]{\bfseries}
{\hspace{-2.45em}\Large\bfseries{\color{structurecolor}\thesection}\enspace}{1pt}{\color{structurecolor}\Large\bfseries\filright}

\titleformat{\subsection}[hang]{\bfseries}
{\hspace{-2.45em}\large\bfseries\color{structurecolor}\thesubsection\enspace}{1pt}{\color{structurecolor}\large\bfseries\filright}

\titleformat{\subsubsection}[hang]{\bfseries}
{\hspace{-2.45em}\large\bfseries\color{structurecolor}\thesubsubsection\enspace}{1pt}{\color{structurecolor}\large\bfseries\filright}


\titlespacing{\chapter}{0pt}{-20pt}{1.3\baselineskip}
%\titlespacing{\subsection}{0pt}{0.5\baselineskip}{-\baselineskip}



%%define the note and proof environment
\RequirePackage{pifont,manfnt,bbding}


\RequirePackage[many]{tcolorbox}
\ifdefstring{\ELEGANT@mode}{fancy}{
\tcbset{
    common/.style={
        fontupper=\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\upshape\kaishu},
        lower separated=false,
        coltitle=white,
        colback=gray!5,
        boxrule=0.5pt,
        fonttitle=\bfseries,
        enhanced,
        breakable,
        top=8pt,
        before skip=8pt,
        attach boxed title to top left={yshift=-0.11in,xshift=0.15in},
        boxed title style={boxrule=0pt,colframe=white,arc=0pt,outer arc=0pt},
        separator sign={.},
    },
    defstyle/.style={
        common,
        colframe=main,  
        colback=main!5,
        colbacktitle=main, 
        overlay unbroken and last={\node[anchor=south east, outer sep=0pt] at (\linewidth-width,0) {\textcolor{main}{$\clubsuit$}}; }
    },
    thmstyle/.style={
        common,
        colframe=second,  
        colback=second!5,
        colbacktitle=second, 
        overlay unbroken and last={\node[anchor=south east, outer sep=0pt] at (\linewidth-width,0) {\textcolor{second}{$\heartsuit$}}; }
    },
    propstyle/.style={
        common,
        colframe=third,  
        colback=third!5,
        colbacktitle=third, 
        overlay unbroken and last={\node[anchor=south east, outer sep=0pt] at (\linewidth-width,0) {\textcolor{third}{$\spadesuit$}}; }
    },
}

\newtcbtheorem[auto counter,number within=chapter]{definition}{
	\ifdefstring{\ELEGANT@lang}{en}{Definition}{定义}
}{defstyle}{def}

\newtcbtheorem[auto counter,number within=chapter]{theorem}{
	\ifdefstring{\ELEGANT@lang}{en}{Theorem}{定理}
}{thmstyle}{thm}

\newtcbtheorem[auto counter,number within=chapter]{proposition}{
	\ifdefstring{\ELEGANT@lang}{en}{Proposition}{命题}
}{propstyle}{pro}

\newtcbtheorem[auto counter,number within=chapter]{corollary}{
	\ifdefstring{\ELEGANT@lang}{en}{Corollary}{推论}
}{thmstyle}{cor}

\newtcbtheorem[auto counter,number within=chapter]{lemma}{
	\ifdefstring{\ELEGANT@lang}{en}{Lemma}{引理}
}{thmstyle}{lem}

}{\relax}

\ifdefstring{\ELEGANT@mode}{simple}{
\let\openbox\relax
\RequirePackage{amsthm}
\let\proof\relax
\let\endproof\relax
% declare a new theorem style
\newtheoremstyle{edefstyle}%
{3pt}% Space above
{3pt}% Space below 
{\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\upshape\kaishu}}% Body font
{}% Indent amount
{\bfseries\color{main}}% Theorem head font
{}% Punctuation after theorem head
{0.5em}% Space after theorem head 
{\thmname{#1} \thmnumber{#2} \thmnote{(#3)}}% Theorem head spec (can be left empty, meaning ‘normal’)
% -------------------------------------------------%
\newtheoremstyle{ethmstyle}%
{3pt}% Space above
{3pt}% Space below 
{\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\upshape\kaishu}}% Body font
{}% Indent amount
{\bfseries\color{second}}% Theorem head font
{}% Punctuation after theorem head
{.5em}% Space after theorem head 
{\thmname{#1} \thmnumber{#2} \thmnote{(#3)}}% Theorem head spec (can be left empty, meaning ‘normal’)
% -------------------------------------------------%
\newtheoremstyle{eprostyle}%
{3pt}% Space above
{3pt}% Space below 
{\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\upshape\kaishu}}% Body font
{}% Indent amount
{\bfseries\color{third}}% Theorem head font
{}% Punctuation after theorem head
{.5em}% Space after theorem head 
{\thmname{#1} \thmnumber{#2} \thmnote{(#3)}}% Theorem head spec (can be left empty, meaning ‘normal’)

\theoremstyle{edefstyle}
\newtheorem{edefinition}{\ifdefstring{\ELEGANT@lang}{en}{Definition}{定义}}[chapter]

\theoremstyle{ethmstyle}
\newtheorem{etheorem}{\ifdefstring{\ELEGANT@lang}{en}{Theorem}{定理}}[chapter]
\newtheorem{elemma}{\ifdefstring{\ELEGANT@lang}{en}{Lemma}{引理}}[chapter]
\newtheorem{ecorollary}{\ifdefstring{\ELEGANT@lang}{en}{Corollary}{推论}}[chapter]

\theoremstyle{eprostyle}
\newtheorem{eproposition}{\ifdefstring{\ELEGANT@lang}{en}{Proposition}{命题}}[chapter]

\newenvironment{theorem}[2]
  {\ifstrempty{#1}{\etheorem}{\etheorem[#1]}\ifstrempty{#2}{}{\label{thm:#2}}}
  {\endetheorem}

\newenvironment{definition}[2]
  {\ifstrempty{#1}{\edefinition}{\edefinition[#1]}\ifstrempty{#2}{}{\label{def:#2}}}
  {\endedefinition}

\newenvironment{lemma}[2]
  {\ifstrempty{#1}{\elemma}{\elemma[#1]}\ifstrempty{#2}{}{\label{lem:#2}}}
  {\endelemma}

\newenvironment{corollary}[2]
  {\ifstrempty{#1}{\ecorollary}{\ecorollary[#1]}\ifstrempty{#2}{}{\label{cor:#2}}}
  {\endecorollary}

\newenvironment{proposition}[2]
  {\ifstrempty{#1}{\eproposition}{\eproposition[#1]}\ifstrempty{#2}{}{\label{pro:#2}}}
  {\endeproposition}
}{\relax}

% main（green-def): example exercise problem solution
% second（orange-thm）: proof note remark  
% third（blue-prop):  assumptions property conclusion custom

%% Example with counter
\newcounter{exam}[chapter]
\setcounter{exam}{0}
\renewcommand{\theexam}{\thechapter.\arabic{exam}}
\newenvironment{example}[1][]{
 		\refstepcounter{exam}\par\noindent\textbf{\color{main}{%
 			\ifdefstring{\ELEGANT@lang}{en}{Example}{例}
 		}\theexam #1 \,}\rmfamily %
 	}{
 		\par\medskip\ignorespacesafterend %
 	}

%% Exercise with counter
\newcounter{exer}[chapter]
\setcounter{exer}{0}
\renewcommand{\theexer}{\thechapter.\arabic{exer}}
\newenvironment{exercise}[1][]{
 		\refstepcounter{exer}\par\noindent\makebox[-3pt][r]{\scriptsize\color{red!90}\HandPencilLeft\quad}\textbf{\color{main}{%
 			\ifdefstring{\ELEGANT@lang}{en}{Exercise}{练习}
 		}\theexer #1 \,}\rmfamily %
 	}{
 		\par\medskip\ignorespacesafterend %
 	}

%% Exercise with counter
\newcounter{prob}[chapter]
\setcounter{prob}{0}
\renewcommand{\theprob}{\thechapter.\arabic{prob}}
\newenvironment{problem}[1][]{
 		\refstepcounter{prob}\par\noindent\textbf{\color{main}{%
 			\ifdefstring{\ELEGANT@lang}{en}{Problem}{例题}
 		}\theprob #1 \,}\rmfamily %
 	}{
 		\par\medskip\ignorespacesafterend %
 	}



\newenvironment{note}{\par\noindent{\makebox[0pt][r]{\scriptsize\color{red!90}\textdbend\quad}\textbf{\color{second}%
	\ifdefstring{\ELEGANT@lang}{en}{Note}{注意}\,
}}\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\kaishu}}{\par}

\newenvironment{proof}{\par\noindent\textbf{\color{second}%
	\ifdefstring{\ELEGANT@lang}{en}{Proof}{证明}\;
}\color{black!90}\small}{
%\hfill$\Box$\quad
\par}
\newenvironment{remark}{\noindent\textbf{\color{second}%
	\ifdefstring{\ELEGANT@lang}{en}{Remark}{注}\,
}}{\par}
\newenvironment{assumption}{\par\noindent\textbf{\color{third}%
	\ifdefstring{\ELEGANT@lang}{en}{Assumption}{假设}\,
}}{\par}
\newenvironment{conclusion}{\par\noindent\textbf{\color{third}%
	\ifdefstring{\ELEGANT@lang}{en}{Conclusion}{结论}\,
}}{\par}
\newenvironment{solution}{\par\noindent\textbf{\color{main}%
	\ifdefstring{\ELEGANT@lang}{en}{Solution}{解}\;
}\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\kaishu}}{\vskip2ex\par}
\newenvironment{property}{\par\noindent\textbf{\color{third}%
	\ifdefstring{\ELEGANT@lang}{en}{Property}{性质}\;
}}{\par}
\newenvironment{custom}[1]{\par\noindent\textbf{\color{third}
	\ifdefstring{\ELEGANT@lang}{en}{#1}{#1}\,
}}{\par}

\RequirePackage{multicol}
\tcbset{
    introduction/.style={
        enhanced,
		breakable,
		colback=structurecolor!10,
		colframe=structurecolor,
  		fonttitle=\bfseries,
  		colbacktitle=structurecolor,
  		fontupper=\ifdefstring{\ELEGANT@lang}{en}{\sffamily}{\kaishu},
  		attach boxed title to top center={yshift=-3mm,yshifttext=-1mm},
  		boxrule=0pt,
  		toprule=0.5pt,
  		bottomrule=0.5pt,
  		top=8pt,
        before skip=8pt,
  		sharp corners
    },
}

\newenvironment{introduction}[1][\ifdefstring{\ELEGANT@lang}{en}{Introduction}{内容提要}]{
\begin{tcolorbox}[introduction,title={#1}]
\begin{multicols}{2}
\begin{itemize}[label=\textcolor{structurecolor}{\scriptsize\SquareShadowBottomRight}]
}{%
\end{itemize}
\end{multicols}
\end{tcolorbox}}

\RequirePackage{adforn}
\newenvironment{problemset}[1][\ifdefstring{\ELEGANT@lang}{en}{\textbf{\chaptername\, Exercise}}{\textbf{\chaptername\, 习题}}]{
\begin{center}
\ifdefstring{\ELEGANT@lang}{en}{\addcontentsline{toc}{section}{\texorpdfstring{\chaptername\,}{Chapter} Exercise} }{\addcontentsline{toc}{section}{\texorpdfstring{\chaptername\,}{章节}习题}}
\textcolor{structurecolor}{\Large\bfseries\adftripleflourishleft~#1~\adftripleflourishright}
\end{center}
\begin{enumerate}[label=\textcolor{structurecolor}{\arabic*.}]}{%
\end{enumerate}}

\def\relsec{\endgroup start}
\def\endrelsec{end\begingroup\def \@currenvir {relsec}}

\ifdefstring{\ELEGANT@result}{noanswer}{
	\AtBeginDocument{
	\excludecomment{solution}
	\excludecomment{proof}
	\excludecomment{inline}
	}
}{\relax}


%页眉页脚
\RequirePackage{fancyhdr}
\RequirePackage{lastpage}
\fancyhf{}


\ifdefstring{\ELEGANT@base}{hide}{
	\if@twoside
	\fancyhead[ER,OR]{\color{structurecolor}\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\kaishu}\rightmark}
	\fancyhead[El,OL]{\color{structurecolor}\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\kaishu}\leftmark}
	\else
	\fancyhead[L]{\color{structurecolor}\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\kaishu}\leftmark}
	\fancyhead[R]{\color{structurecolor}\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\kaishu}\rightmark}
	\fancyfoot[c]{\color{structurecolor}\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\kaishu}--\;\thepage/\pageref*{LastPage}\;--}
	\fi
}{\relax}


\ifdefstring{\ELEGANT@base}{show}{
	\fancyfoot[c]{\catcode`\$=3\relax\base{structurecolor}{88}}
	\if@twoside
	\fancyhead[ER,OL]{\color{structurecolor}\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\kaishu}--\;\thepage/\pageref*{LastPage}\;--}
	\fancyhead[EL]{\color{structurecolor}\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\kaishu}\leftmark}
	\fancyhead[OR]{\color{structurecolor}\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\kaishu}\rightmark}
	\else
	\fancyhead[R]{\color{structurecolor}\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\kaishu}--\;\thepage/\pageref*{LastPage}\;--}
	\fancyhead[L]{\color{structurecolor}\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\kaishu}\leftmark}
	\fi
}{\relax}


\renewcommand{\headrule}{\color{structurecolor}\hrule width\textwidth}
\pagestyle{fancy}
\renewcommand{\headrulewidth}{1pt}
% \renewcommand{\headrule}{}
\fancypagestyle{plain}{\renewcommand{\headrulewidth}{0pt}\fancyhf{}\renewcommand{\headrule}{}}
\renewcommand{\sectionmark}[1]{\markright{\thesection\, #1}{} }
\renewcommand{\chaptermark}[1]{\markboth{\chaptername \, #1\,}{}}

%%封面
\newcommand*{\extrainfo}[1]{\def\@extrainfo{#1}}

\def\IfEmpty#1{%
  \edef\1{\the#1}
  \ifx\1\empty
}
\def \ifempty#1{\def\temp{#1} \ifx\temp\empty }

\newcommand*{\logo}[1]{
 \def\@logo{\includegraphics[width=4.2cm]{#1}
 }
}
\ifdefstring{\ELEGANT@device}{normal}{
\newcommand*{\cover}[1]{
 \def\@cover{\includegraphics[width=\linewidth]{#1}
 }
}}{\relax}

\ifdefstring{\ELEGANT@device}{pad}{
\newcommand*{\cover}[1]{
 \def\@cover{\includegraphics[trim=0 26bp 0 26bp,clip=true, width=\linewidth]{#1}
 }
}}{\relax}

\renewcommand{\baselinestretch}{1.35} 

\renewcommand*{\maketitle}{%
\hypersetup{pageanchor=false}
\begin{titlepage}
	\newgeometry{margin = 0in}
	\parindent=0pt
	\@cover
	\setlength{\fboxsep}{0pt}
	\colorbox{second}{\makebox[\linewidth][c]{\shortstack[c]{\vspace{0.5in}}}}
	\vfill
	\vskip-2ex
	\hspace{2em}
	\parbox{0.8\textwidth}{
		\bfseries\Huge \@title\par
	}
	\vfill
	\vspace{-1.0cm}
	\setstretch{2.5}
	\hspace{2.5em}
	\begin{minipage}[c]{0.67\linewidth}
		{\color{darkgray}\bfseries\Large \the\subtitle\\[2ex]}
		\color{gray}\normalsize
		{\renewcommand{\arraystretch}{0.618}
		\begin{tabular}{l} 
			\ifdefstring{\ELEGANT@lang}{en}{\textbf{Author:}}{\kaishu 作者：} \@author \\
			\ifdefstring{\ELEGANT@lang}{en}{\textbf{Institute:}}{\kaishu 组织：} \the\institute\\
			\ifdefstring{\ELEGANT@lang}{en}{\textbf{Date:}}{\kaishu 时间：} \@date\\
			\ifdefstring{\ELEGANT@lang}{en}{\textbf{Version:}}{\kaishu 版本：} \the\version\\
		\end{tabular}}
	\end{minipage}
	\begin{minipage}[c]{0.27\linewidth}
	\begin{tikzpicture}[remember picture,overlay]
		\begin{pgfonlayer}{background}
		  \node[opacity=0.8,anchor=south east,outer sep=0pt,inner sep=0pt] at ($(current page.south east) +(-0.8in,1.5in)$) {\@logo};
		\end{pgfonlayer}
	\end{tikzpicture}
	\end{minipage}
	\vfill
	\begin{center}
	\setstretch{1.3}
	\parbox[t]{0.7\textwidth}{\centering \itshape \@extrainfo}
	\end{center}
	\vfill
\end{titlepage}
\restoregeometry
\thispagestyle{empty}
}



\RequirePackage{listings} 
\renewcommand{\ttdefault}{cmtt}
\lstdefinestyle{mystyle}{
  basicstyle=%
    \ttfamily
    \lst@ifdisplaystyle\small\fi
}

\lstset{basicstyle=\ttfamily,style=mystyle,breaklines=true}

\definecolor{lightgrey}{rgb}{0.9,0.9,0.9}
\definecolor{frenchplum}{RGB}{190,20,83}
\lstset{language=[LaTeX]TeX,
	texcsstyle=*\color{winered},
	numbers=none,
	breaklines=true,
	keywordstyle=\color{winered},
	commentstyle=\color{gray},
	emph={elegantpaper,fontenc,fontspec,xeCJK,FiraMono,xunicode,newtxmath,figure,fig,image,img,table,itemize,enumerate,newtxtext,newtxtt,ctex,microtype,description,times,newtx,booktabs,tabular,PDFLaTeX,XeLaTeX,type1cm,BibTeX,device,color,mode,lang,amsthm,tcolorbox,titlestyle,cite,marginnote,ctex,listings,base},
	emphstyle={\color{frenchplum}},
	morekeywords={DeclareSymbolFont,SetSymbolFont,toprule,midrule,bottomrule,institute,version,includegraphics,setmainfont,setsansfont,setmonofont ,setCJKmainfont,setCJKsansfont,setCJKmonofont,RequirePackage,figref,tabref,email,maketitle,keywords,definecolor,extrainfo,logo,cover,subtitle,appendix,chapter,hypersetup,mainmatter,tableofcontents,elegantpar,heiti,kaishu,lstset,pagecolor,zhnumber,marginpar,part,equote,marginnote},
	frame=single,
	tabsize=2,
	rulecolor=\color{structurecolor},
	framerule=0.2pt,
	columns=flexible,
	% backgroundcolor=\color{lightgrey}
}
\newcommand\bmmax{0}
\RequirePackage{bm}