// Cover spread: back + spine + front as one page
// A5 = 148mm x 210mm, spine ~2mm for 30 pages at 80gsm
// Total width = 148 + 2 + 148 = 298mm
// Add 3mm bleed on each edge for print
// Background image size: 304mm x 216mm (298+6 x 210+6) = 3591px x 2551px at 300dpi

#let page-w = 148mm
#let page-h = 210mm
#let spine-w = 2mm
#let bleed = 3mm

#set page(
  width: page-w * 2 + spine-w + bleed * 2,
  height: page-h + bleed * 2,
  margin: 0pt,
  fill: black,
)
#set text(font: "New Computer Modern")

// Front cover: title + subtitle centered on the right half
#place(
  top + left,
  dx: bleed + page-w + spine-w,
  dy: bleed,
  box(
    width: page-w,
    height: page-h,
    align(center + horizon,
      [
        #text(size: 18pt, fill: white, weight: "bold", tracking: 2pt)[QUIS SUMUS]
        #v(0.5em)
        #text(size: 8pt, fill: gray, style: "italic")[Existence, immortality, and the irrelevance of both]
      ]
    )
  )
)

// Spine: "Gabriel Kaszewski" rotated
#place(
  top + left,
  dx: bleed + page-w + spine-w / 2 - 2pt,
  dy: page-h / 2 + bleed,
  rotate(-90deg,
    text(size: 4pt, fill: white, tracking: 1pt)[GABRIEL KASZEWSKI]
  )
)