#let lettre(
  de: "",
  pour: "",
  objet: "",
  date: "",
  lieu: "",
  introduction: "",
  cloture: "",
  signature: "",
  post: "",
  doc
) = {
  set page(margin: 1.5in)
  set par(leading: 0.55em, first-line-indent: 2em, justify: true, spacing: 0.55em)
  set text(font: "Libertinus Serif", size: 12pt)
  set document(title: objet, author: signature)
  show raw: set text(font: "Inconsolata")
  show heading: set block(above: 1.4em, below: 1em)

  let formatLieuDate(lieu, date) = {
    let isDate = date.trim().len() > 0;
    let isLieu = lieu.trim().len() > 0;
    if isLieu [#lieu]
    if isDate {
      if isLieu [, ]
      [le #date]
    }
  }

  grid(
    columns: (2fr, 1fr, 2fr),
    par(de),
    text[],
    text[
      #formatLieuDate(lieu, date)
    ] + v(2em),
    text[],
    text[],
    par(pour)
  )
  v(1em)
  if objet.trim().len() > 0 {
    heading(level: 3, text("Objet: " + objet))
    v(1em)
  }
  par(first-line-indent: 0pt, text(introduction + ","))
  v(1em)
  doc
  v(1em)
  par(first-line-indent: 0pt, text(cloture))
  v(.7em)
  grid(
    columns: (2fr, 1fr),
    text[],
    text(signature)
  )
  v(1em)
  post
}

#let er = [#super[er]]
#let ème = [#super[ème]]
#let no(num) = { text([n°~] + num) }