#let content-to-string(content) = {
  if content.has("text") {
    content.text
  } else if content.has("children") {
    content.children.map(content-to-string).join("")
  } else if content.has("body") {
    content-to-string(content.body)
  } else if content == [ ] {
    " "
  }
}
#let conf(
  title: none,
  subtitle: none,
  authors: (),
  keywords: (),
  date: none,
  abstract-title: none,
  abstract: none,
  thanks: none,
  cols: 1,
  margin: (x: 1.25in, y: 1.25in),
  paper: "us-letter",
  lang: "en",
  region: "US",
  font: (),
  fontsize: 11pt,
  mathfont: none,
  codefont: none,
  linestretch: 1,
  sectionnumbering: none,
  linkcolor: none,
  citecolor: none,
  filecolor: none,
  pagenumbering: "1",
  doc,
) = {
  set document(
    title: title,
    keywords: keywords,
  )
  set document(
      author: authors.map(author => content-to-string(author.name)).join(", ", last: " & "),
  ) if authors != none and authors != ()
  set page(
    paper: paper,
    margin: margin,
    numbering: pagenumbering,
  )

  set par(
    justify: true,
    leading: linestretch * 0.65em
  )
  set text(lang: lang,
           region: region,
           font: font,
           size: fontsize)

  show math.equation: set text(font: mathfont) if mathfont != none
  show raw: set text(font: codefont) if codefont != none

  set heading(numbering: sectionnumbering)

  show link: set text(fill: rgb(content-to-string(linkcolor))) if linkcolor != none
  show ref: set text(fill: rgb(content-to-string(citecolor))) if citecolor != none
  show link: this => {
    if filecolor != none and type(this.dest) == label {
      text(this, fill: rgb(content-to-string(filecolor)))
    }
  }

  block(below: 4mm)[
    #if title != none {
      align(center)[#block(inset: 2em)[
          #text(weight: "bold", size: 1.5em)[#title #if thanks != none {
              footnote(thanks, numbering: "*")
              counter(footnote).update(n => n - 1)
            }]
          #(
            if subtitle != none {
              parbreak()
              text(weight: "bold", size: 1.25em)[#subtitle]
            }
          )
        ]]
    }

    #if authors != none and authors != [] {
      let count = authors.len()
      let ncols = calc.min(count, 3)
      grid(
        columns: (1fr,) * ncols,
        row-gutter: 1.5em,
        ..authors.map(author => align(center)[
          #author.name \
          #author.affiliation \
          #author.email
        ])
      )
    }

    #if date != none {
      align(center)[#block(inset: 1em)[
          #date
        ]]
    }

    #if abstract != none {
      block(inset: 2em)[
        #text(weight: "semibold")[#abstract-title] #h(1em) #abstract
      ]
    }
  ]

  doc
}