\documentclass[paper=a4, fontsize=12pt]{scrreprt}
\usepackage{acronym}
\usepackage{lipsum}
\usepackage{xspace}
\usepackage[ngerman] {babel}
\usepackage[utf8]{inputenc}
\usepackage[hyphens]{url}
\newcommand*\oldurlbreaks{}
\let\oldurlbreaks=\UrlBreaks
\renewcommand{\UrlBreaks}{\oldurlbreaks\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\?\do\&}
\usepackage{csquotes}
\usepackage[style=alphabetic, backend=biber]{biblatex}
\addbibresource{Literatur.bib}
\newpage
\bibliography{Literatur.bib}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{graphicx}
\usepackage{float}
\usepackage{scrhack}
\usepackage {booktabs}
\usepackage{longtable}
\usepackage{pbox}
\usepackage{tabularx}
\usepackage{geometry}
\geometry{left=4.0cm, right=3.0cm, top=2.5cm, bottom=2cm}
\usepackage{setspace}
\usepackage{pdfpages}
\usepackage{capt-of}
\usepackage{palatino}
\renewcommand\familydefault{\sfdefault}
\usepackage{color}
\usepackage{microtype}
\usepackage{parskip}
\usepackage{scrlayer-scrpage}
\clearpairofpagestyles
\setkomafont{pageheadfoot}{\sffamily\footnotesize}
\setkomafont{pagehead}{\bfseries}
\setkomafont{pagination}{}
\KOMAoptions{
   headsepline = true,
   footsepline = true,
   plainfootsepline = true,
}
\renewcommand{\chapterpagestyle}{scrheadings}
\automark[chapter]{chapter}
\ohead{\pagemark}
\ihead{\headmark}
\newcounter{blankpages}
\renewcommand\thepage{\the\numexpr\value{page}-\value{blankpages}\relax}
\newcommand{\leerseite}{\cleardoublepage\stepcounter{blankpages}}
\usepackage[pdfborderstyle={/S/U/W 1}]{hyperref}