Left/Right margins, Logo and Section Name in Heading, Pagenumbering in the footer

_extensions/header/header.tex

@@ -6,3 +6,27 @@
 \usepackage[hyphens]{url}
 \usepackage[hidelinks]{hyperref}
 \setlength{\emergencystretch}{3em} % Prevent overfull lines
+
+\usepackage{fancyhdr}
+
+% Define the fancy style but don't activate yet
+\fancypagestyle{fancy}{
+  \fancyhf{} % clear all header and footer fields
+  \fancyhead[RO,LE]{\includegraphics[height=1.5cm]{images/preamble/logo.png}}
+  \fancyhead[LO,RE]{\nouppercase{\leftmark}} 
+  \fancyfoot[RO,LE]{\thepage}
+  \renewcommand{\headrulewidth}{0.4pt}
+  \renewcommand{\footrulewidth}{0.4pt}
+  \newgeometry{top=2.5cm, bottom=2cm, left=3cm, right=2cm, includehead, includefoot}
+  \setlength{\headheight}{50pt}
+  \setlength{\footskip}{30pt}
+}
+
+\renewcommand{\sectionmark}[1]{\markboth{#1}{}} % Set section title to \leftmark
+
+% Default style for preamble/TOC
+\pagestyle{plain}
+\fancyhf{}
+\fancyfoot[C]{\thepage}
+\renewcommand{\headrulewidth}{0pt}
+\renewcommand{\footrulewidth}{0pt}