\documentclass[a4paper,12pt]{report}
\usepackage[left=3cm,right=2.5cm,top=2.5cm,bottom=2.5cm]{geometry}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[english,greek]{babel}
\usepackage{amsmath,amsfonts,amssymb}
\usepackage[parfill]{parskip}
\usepackage[unicode]{hyperref}
\usepackage{bookmark}
\usepackage{cite}
\usepackage{graphicx}
\usepackage{subcaption}
\usepackage{float}
\usepackage{siunitx}
\usepackage{color}
\usepackage{kmath,kerkis}
\usepackage{fancyhdr}
\usepackage[numbers]{natbib}
\graphicspath{{../PICS/}}
\def\tl{\textlatin}
\def\tg{\textgreek}
\fancypagestyle{cu}{
\fancyhf{} % Clear header and footer
\fancyfoot[R]{\thepage} % Page number on the right side of the footer
\renewcommand{\headrulewidth}{0pt} % No header rule
}
\begin{document}
\pagestyle{cu}
\include{cover}
\setcounter{page}{3}
\cleardoublepage
\phantomsection
\addcontentsline{toc}{chapter}{Περίληψη}
\include{DOCUMENT/abs_greek}
\cleardoublepage
\phantomsection
\addcontentsline{toc}{chapter}{Abstract}
\include{DOCUMENT/abs_eng}
\cleardoublepage
\phantomsection
\addcontentsline{toc}{chapter}{Ευχαριστίες}
\pagestyle{cu}
\include{thanks}
\thispagestyle{cu}
\tableofcontents
\thispagestyle{cu}
\include{chapter1}
\thispagestyle{cu}
\selectlanguage{english}
\cleardoublepage
\phantomsection
\addcontentsline{toc}{chapter}{\bibname}
\bibliographystyle{unsrt} % Use plainnat style
\bibliography{DOCUMENT/references}
\thispagestyle{cu}
\cleardoublepage
\phantomsection
\thispagestyle{cu}
\include{acronyms}
\thispagestyle{cu}
\end{document}
