feat(easy-typography): initial implementation

easy-typography/src/constants.typ

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+// Constants
+
+// space above H1
+#let heading-above-max = 1.25em
+
+// space above H5
+#let heading-above-min = 0.80em
+
+// space below H1
+#let heading-below-max = 0.65em
+
+// space below H5
+#let heading-below-min = 0.55em
+
+// font size for H1
+#let heading-size-max  = 1.10em
+
+// font size for H5
+#let heading-size-min  = 1.00em
+
+// default text weight -- light is best for reading, and printers are fine with
+// it these days
+#let body-weight       = "light"
+
+// line spacing -- tight; efficient but still readable with good fonts
+#let line-spacing      = 1.30
+
+// paragraph spacing -- defaults to a double-space
+#let paragraph-spacing = 1.70

easy-typography/src/main.typ

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+#import "constants.typ": *
+
+/// The main function for easy typography setup.
+/// - body-size: The size of body text (default 10pt).
+/// - fonts: A dictionary specifying heading/body fonts.
+/// - paper: The paper size to use (none to skip).
+/// - margin: Margin for the page (none to skip).
+#let easy-typography(
+  body-size: 10pt,
+  fonts: (heading: "Libertinus Sans", body: "Libertinus Serif"),
+  paper: none,
+  margin: none,
+  body
+) = {
+  // Optional page setup
+  if paper != none {
+    set page(paper: paper)
+  }
+  if margin != none {
+    set page(margin: margin)
+  }
+
+  // Paragraphs
+  set par(
+    leading: line-spacing * 0.5em,
+    spacing: paragraph-spacing * 0.5em,
+    justify: true,
+    linebreaks: "optimized",
+  )
+
+  // Body text
+  set text(
+    font: fonts.body,
+    fallback: false,
+    style: "normal",
+    weight: body-weight,
+    stretch: 100%,
+    size: body-size,
+    tracking: 0pt,
+    spacing: 100% + 0pt,
+    baseline: 0pt,
+    overhang: true,
+    hyphenate: true,
+    kerning: true,
+    ligatures: true,
+    number-type: "lining",
+  )
+
+  // Top-heavy easing function for heading sizes/spacing:
+  //    - max = biggest size (H1), min = smallest size (H5), level in [1..5]
+  //    - sqrt(t) => gives biggest decrease at top, gentlest at bottom
+  let compute-size(max, min, level) = {
+    if level <= 1 {
+      max
+    } else if level >= 5 {
+      min
+    } else {
+      let t = (level - 1) / 4
+      max - (max - min) * calc.sqrt(t)
+    }
+  }
+
+  // Heading weight logic
+  let compute-weight(level) = {
+    if level <= 1 {
+      "bold"
+    } else if level == 2 {
+      "semibold"
+    } else if level == 3 {
+      "medium"
+    } else {
+      "regular"
+    }
+  }
+
+  // Show headings using computed size/spacing values
+  show heading: it => block(
+    breakable: false,
+    sticky: true,
+    above: compute-size(heading-above-max, heading-above-min, it.level),
+    below: compute-size(heading-below-max, heading-below-min, it.level),
+    text(
+      font: fonts.heading,
+      size: compute-size(heading-size-max, heading-size-min, it.level),
+      weight: compute-weight(it.level),
+      it
+    )
+  )
+
+  // Finally, render the body
+  body
+}