\usepackage[sfdefault]{roboto}

\usepackage[capitalize,noabbrev,nameinlink,italian]{cleveref}

%%%% Sections styles %%%%%
\usepackage{titlesec,titletoc}

\setcounter{secnumdepth}{2}

% chapter format
\titleformat{\chapter}%
{\huge\rmfamily\itshape\color{def1}}% format applied to label+text
{\llap{\colorbox{def1}{\parbox{1.5cm}{\hfill\itshape\huge\color{white}\thechapter}}}}% label
{2pt}% horizontal separation between label and title body
{}% before the title body
%{\titlerule*[0.7em]{.}\rmfamily\upshape\thechapter} % filler + page (leaders and page num)
[]% after the title body

% section format
\titleformat{\section}%
{\normalfont\Large\itshape\color{theorem1}}% format applied to label+text
{\llap{\colorbox{theorem1}{\parbox{1.5cm}{\hfill\color{white}\thesection}}}}% label
{1em}% horizontal separation between label and title body
{}% beforethe title body
[]% after the title body

% subsectionformat
\titleformat{\subsection}%
{\normalfont\large\itshape\color{ex1}}% format applied to label+text
{\llap{\colorbox{ex1}{\parbox{1.5cm}{\hfill\color{white}\thesubsection}}}}% label
{1em}% horizontal separation between label and title body
{}% beforethe title body
[]% after the title body

%%%% TOC CHANGES %%%%
\titlecontents{chapter}%
[-4em] % distance from left margin
{\fontsize{15}{25}\itshape\bfseries} % above (global formatting of entry)
{\hspace*{2em}\textcolor{def1}{\contentslabel{2em}}} % before w/label (label = ``2.6'')
{\hspace*{2em}} % before w/o label
{\titlerule*[0.7em]{.}\rmfamily\upshape\contentspage} % filler + page (leaders and page num)
[] % after

\titlecontents{section}%
[0em] % distance from left margin
{\fontsize{11}{15}\itshape} % above (global formatting of entry)
{\hspace*{2em}\textcolor{theorem1}{\contentslabel{2em}}} % before w/label (label = ``2.6'')
{\hspace*{2em}} % before w/o label
{\titlerule*[0.7em]{.}\rmfamily\upshape\contentspage} % filler + page (leaders and page num)
[] % after


% Theorems, Definitions and Examples

\usepackage[theorems,skins,breakable,listings]{tcolorbox}

\definecolor{theorem1}{HTML}{ff8f00}
\definecolor{theorem2}{HTML}{ffca28}

\definecolor{def1}{HTML}{2e7d32}
\definecolor{def2}{HTML}{66bb6a}

\definecolor{ex1}{HTML}{1565c0}
\definecolor{ex2}{HTML}{42a5f5}

\tcbset{
  defstyle/.style={
    breakable,
    theorem style=plain apart,
    enhanced,
    sharp corners,
    frame hidden,
    colbacktitle=def1,
    colback=def2!50!white,
    coltitle=white,
    boxrule=0pt,
    titlerule=1mm,
    titlerule style=def1!50!black,
    fonttitle=\upshape\bfseries,
    fontupper=\upshape,
    boxrule=0.4pt,
    halign=left
  },
 exstyle/.style={
    breakable,
    theorem style=plain apart,
    enhanced,
    sharp corners,
    frame hidden,
    colbacktitle=ex1,
    colback=ex2!50!white,
    coltitle=white,
    boxrule=0pt,
    titlerule=1mm,
    titlerule style=ex1!50!black,
    fonttitle=\upshape\bfseries,
    fontupper=\upshape,
    boxrule=0.4pt,
    halign=left
  },
  thmstyle/.style={
    breakable,
    theorem style=plain apart,
    enhanced,
    sharp corners,
    frame hidden,
    colbacktitle=theorem1,
    colback=theorem2!50!white,
    coltitle=white,
    boxrule=0pt,
    titlerule=1mm,
    titlerule style=theorem1!50!black,
    fonttitle=\upshape\bfseries,
    fontupper=\itshape,
    boxrule=0.4pt,
    halign=left
  },
  proofstyle/.style={
    breakable,
    enhanced,
    theorem style=plain,
    frame hidden,
    sharp corners,
    colback=gray!15!white,
    boxrule=0pt,
    before skip=10pt,
    after skip=10pt,
    borderline west={1mm}{0pt}{darkgray},
    fonttitle=\bfseries,
    coltitle=black,
    title=Dimostrazione,
    halign=left
  }
}

% This allows for the skins library to not be externalized by Tikz, removing problems
\tcbset{shield externalize}
\makeatletter
% add tcblistings to \jobname.lol (list of listings)
\tcbset{
  addtolol/.style={list entry={\kvtcb@title},add to list={lol}{subsection}},
}
\makeatother

\newtcbtheorem[crefname={teorema}{teoremi},Crefname={Teorema}{Teoremi},list
inside=thm,number within=chapter]{Thm}{Teorema}{thmstyle}{thm}
\newtcbtheorem{Proof}{Dimostrazione}{proofstyle}{}
\newtcbtheorem[crefname={esempio}{esempi},Crefname={Esempio}{Esempi},list
inside=ex,number within=chapter]{Ex}{Esempio}{exstyle}{ex}
\newtcbtheorem[crefname={definizione}{definizioni},Crefname={Definizione}{Definizioni},list
inside=def,number within=chapter]{Def}{Definizione}{defstyle}{def}