\setuphead
  [part]
  [
   style=\bfd,
   textcolor=Couleur1,
   numbercolor=CouleurContraste1,
   bodypartlabel=Part,
   placehead=yes,
   page=left,
   header=high,
   align=flushleft,
   alternative=middle,
   before={\strut\godown[4cm]},
  ]

\setuphead
  [chapter]
  [
   style=\bfc,
   textcolor=Couleur2,
   numbercolor=CouleurContraste2,
   sectionsegments=1:2,
   page=yes,
   align=flushleft,
  ]

\setuphead
  [title]
  [
  ]

\setuphead
  [section]
  [
   style=\bfb,
   textcolor=Couleur3,
   numbercolor=CouleurContraste3,
   sectionsegments=1:3,
   page=yes,
   align=flushleft,
  ]

\setuphead
  [subject]
  [
  ]

\setuphead
  [subsection]
  [
   style=\bfa,
   textcolor=Couleur4,
   numbercolor=CouleurContraste4,
   sectionsegments=1:4,
   align=flushleft,
  ]

\setuphead
  [subsubject]
  [
  ]

\setuphead
  [subsubsection]
  [
   style=\bf,
   textcolor=Couleur5,
   numbercolor=CouleurContraste5,
   sectionsegments=1:5,
   align=flushleft,
  ]

\setuphead
  [subsubsubject]
  [
  ]

\setuphead
  [subsubsubsection]
  [
   textcolor=CouleurContraste3,
   numbercolor=CouleurContraste3,
  ]