LaTeX Forum

\documentclass[a4paper,12pt, twoside=true, DIV=10,bibliography=totoc]{scrbook} 
\usepackage[english]{babel} 
\usepackage{amsmath} 
\usepackage{geometry} 
\geometry{a4paper, top=40mm, right=35mm, left=25mm, bottom=35mm,headsep=10mm,footskip=12mm} 
\usepackage{blindtext} 
\usepackage{fontspec,lipsum} 
\usepackage{titleps} 
\usepackage{tikz} 
\usetikzlibrary{fadings} 
\setkomafont{disposition}{\normalcolor} 
\renewcommand{\familydefault}{\sfdefault} 
\setkomafont{pageheadfoot}{} 
\renewcommand*{\sectionmarkformat}{} 
\renewcommand*{\subsectionmarkformat}{} 
\defaultfontfeatures{Ligatures=TeX} 
\setsansfont{Linux Libertine} 
%Kapitelformat 
\renewcommand*\chaptermarkformat{} 
\setkomafont{chapter}{\Huge} 
\setkomafont{chapterprefix}{\sffamily\large\slshape} 
\newkomafont{chapternumber}{\sffamily \fontsize{120}{100}\itshape} 

\renewcommand\chapterformat{% 
  \usekomafont{chapter} 
  \raisebox{1.25\baselineskip}{\makebox[0pt][r]{\usekomafont{chapterprefix}\chapapp\enskip}}% 
  \raisebox{-.5\baselineskip}{\usekomafont{chapternumber}\thechapter}% 
} 

\RedeclareSectionCommand[ 
  innerskip=1ex 
]{chapter} 

\newbox\chapternumberbox 
\makeatletter 
\renewcommand\chapterlinesformat[3]{% 
  \ifstr{#1}{chapter}{% 
    \ifstr{#2}{}{#3}{% 
      \savebox\chapternumberbox{\chapterformat}% 
      \parbox[tt]{\dimexpr\textwidth-\wd\chapternumberbox-1em\relax}{\raggedchapter#3}% 
       \quad#2% 
    } 
    }{\@hangfrom{#2}{#3}}% 
} 
\makeatother 

\renewcommand\raggedchapter{\raggedleft} 
%\automark{chapter} 

%Kopfzeilenformat 
\newpagestyle{main}% 
  {\sethead 
   [\textit{\thepage}\hspace*{0.75cm}\sectiontitle]% even left 
   []% even centre 
   []% even right 
   {}% odd left 
   {}% odd centre 
   {{\chaptertitle}\hspace*{0.75cm}\textit{\thepage} }% odd right 
  } 

  \pagestyle{main} 
  
\renewcommand\makeheadrule 
  {\raisebox{-.45\baselineskip}% 
    {\ifodd\count0% 
       \makebox[\textwidth][r]% 
         {\tikz\fill[darkgray,path fading=west, fading angle=-1] (-8,-0.1) rectangle (5.5,0.002);}% 
     \else 
       \makebox[\textwidth][l]% 
         {\tikz\fill[darkgray,path fading=east, fading angle=1] (-8,-0.1) rectangle (5.5,0.002);}% 
     \fi 
    }% 
  } 
\renewcommand*{\chapterpagestyle}{main} 
\begin{document} 
\pagenumbering{roman} 
Hier könnten Danksagungen stehen. 
\newpage 
Hier auch. 
\tableofcontents 
\chapter{Introduction} 
\section{Section} 
\pagenumbering{arabic} 
\Blindtext[20] 
\end{document} 

\renewcommand*{\chapterpagestyle}{main}

chapter 1.
./test.tex:96: Missing number, treated as zero.
<to be read again> 
                   }
l.96 \section{Section}
                      
./test.tex:96: Illegal unit of measure (pt inserted).
<to be read again> 
                   }
l.96 \section{Section}
                      
./test.tex:96: Missing number, treated as zero.
<to be read again> 
                   }
l.96 \section{Section}
                      
./test.tex:96: Illegal unit of measure (pt inserted).
<to be read again> 
                   }
l.96 \section{Section}

\documentclass[12pt,DIV=10,bibliography=totoc,egregdoesnotlikesansseriftitles]{scrbook}
\usepackage[english]{babel}
\usepackage{blindtext}
\usepackage{fontspec}
\usepackage{tikz}
\usetikzlibrary{fadings}
\setkomafont{pageheadfoot}{}
\setkomafont{pagenumber}{\slshape}
\usepackage{libertine}
%Kapitelformat
\setkomafont{disposition}{}
\setkomafont{chapter}{\Huge}
\setkomafont{chapterprefix}{\large\slshape}% Wirklich schräg mit 
\newkomafont{chapternumber}{\fontsize{120}{100}\itshape}% italic gemischt!?!

\renewcommand\chapterformat{%
  \usekomafont{chapter}
  \raisebox{1.25\baselineskip}{\makebox[0pt][r]{\usekomafont{chapterprefix}\chapapp\enskip}}%
  \raisebox{-.5\baselineskip}{\usekomafont{chapternumber}\thechapter}%
}

\newbox\chapternumberbox
\makeatletter
\renewcommand\chapterlinesformat[3]{%
  \ifstr{#1}{chapter}{%
    \ifstr{#2}{}{#3}{%
      \savebox\chapternumberbox{\chapterformat}%
      \parbox[tt]{\dimexpr\textwidth-\wd\chapternumberbox-1em\relax}{\raggedchapter#3}%
       \quad#2%
    }
    }{\@hangfrom{#2}{#3}}%
}
\makeatother

\renewcommand\raggedchapter{\raggedleft}

%\automark{chapter}

%Kopfzeilenformat
\usepackage[automark]{scrlayer-scrpage}
\rohead{\leftmark\hspace{.75cm}\pagemark}% usual would be \rightmark
\lehead{\pagemark\hspace{.75cm}\rightmark}% usual would be \leftmark
\renewcommand*{\chapterpagestyle}{headings}
\renewcommand*{\chaptermarkformat}{}
\renewcommand*{\sectionmarkformat}{}
\DeclareNewLayer[%
  background,
  oddpage,
  head,
  addvoffset=.45\baselineskip,
  contents={%
       \makebox[\textwidth][r]%
         {\tikz\fill[darkgray,path fading=west, fading angle=-1] (-8,-0.1) rectangle (5.5,0.002);}%
  }%
]{oddheadrule}
\DeclareNewLayer[%
  background,
  evenpage,
  head,
  addvoffset=.45\baselineskip,
  contents={%
       \makebox[\textwidth][l]%
         {\tikz\fill[darkgray,path fading=east, fading angle=1] (-8,-0.1) rectangle (5.5,0.002);}%
  }%
]{evenheadrule}
\AddLayersToPageStyle{scrheadings}{oddheadrule,evenheadrule}  
\AddLayersToPageStyle{plain.scrheadings}{oddheadrule,evenheadrule}

\begin{document}
\pagenumbering{roman}
Hier könnten Danksagungen stehen.
\newpage
Hier auch.
\tableofcontents
\chapter{Introduction}
\section{Section}
\pagenumbering{arabic}
\Blindtext[20]
\end{document}