Pagination, left indent

Question

I have created my personal style .sty, where I inserted all the declarations of my LaTeX document. In particular, I redefined \chapter, \section, \subsection, ..., so they appear as in the picture below )

My problem is as follows. I'd like a left indentation inside the chapter's content. Ad you can see in the picture (word processor), the title has a 0 indentation (margin set with the geometry package). I wish to have an indentation in all the paragraphs, section title, subsection, ..., inside the chapter, but mantaining the correct margin in the footer (see picture below).

I have obtained these one....the problem is the absence of indentation :(

Answer 1

I guess it could be easier to define the body margin with gemotry and shift the head line into the margin, like this

\documentclass{report}

\usepackage{geometry}
\geometry{
    left=5cm,
}

\usepackage{titlesec}
\titleformat{\chapter}{\bfseries\LARGE}{\hspace*{-2cm}\thechapter}{2em}{}
\titlespacing*{\section}{-2cm}{3\baselineskip}{2\baselineskip}

\usepackage{lipsum}% blind text

\begin{document}
\chapter{Chapter title}
\lipsum[2-3]
\section{Section}
\lipsum[1-5]
\end{document}