#let input(k, default: "") = sys.inputs.at(k, default: default)
#let logo = input("logo")
#set page(paper: "a4", flipped: true, margin: 18mm,
  background: place(center + horizon, rect(width: 100% - 24mm, height: 100% - 24mm, stroke: 1.2pt + rgb("b8341c"), inset: 0pt)[#place(center + horizon, rect(width: 100% - 4mm, height: 100% - 4mm, stroke: 0.4pt + rgb("b8341c")))]))
#set text(font: "Libertinus Serif", fill: rgb("1a1917"))
#align(center)[
  #v(6mm)
  #if logo != "" { image(logo, width: 40mm) } else { text(size: 14pt, weight: 600)[#input("issuer")] }
  #v(8mm)
  #text(size: 12pt, tracking: 4pt, fill: luma(110))[CERTIFICATE OF COMPLETION]
  #v(6mm)
  #text(size: 12pt, fill: luma(90))[This certifies that]
  #v(3mm)
  #text(size: 36pt, weight: 600)[#input("recipient")]
  #v(4mm)
  #text(size: 12pt, fill: luma(90))[has successfully completed]
  #v(2mm)
  #text(size: 18pt, style: "italic")[#input("course")]
  #v(12mm)
  #grid(columns: (1fr, 1fr), gutter: 40mm,
    [#line(length: 100%, stroke: 0.5pt) #v(2pt) #text(size: 9.5pt)[#input("signer")]],
    [#line(length: 100%, stroke: 0.5pt) #v(2pt) #text(size: 9.5pt)[#input("date")]])
  #v(1fr)
  #text(size: 8pt, fill: luma(150))[#input("issuer") · #input("serial")]
]