Format de guió cinematogràfic

// ═══ Postext Cookbook · Nº 061 · Screenplay format ═══════════════════════════════
// https://postext.dev/en/cookbook/screenplay-format
// Code: MIT · Text: original (CC BY 4.0) · Pictures: none
// Fonts: Courier Prime, Oswald (SIL OFL 1.1), Special Elite (Apache 2.0) · Needs postext ≥ 1.4.1
import { buildDocument, renderPageToCanvas, clearMeasurementCache } from 'https://esm.sh/postext';

const LANG = 'es'; // @lang: the language of the sample document ('en' | 'es')
const RECIPE = 'screenplay-format';

// ─── 1 · Design ─────────────────────────────────────────────────────────────
const palette = { // black type on white bond, and a card cover in goldenrod
  ink: '#1b1b1b', // every line of the script
  paper: '#ffffff',
  hole: '#e3e1db', // the punched holes down the left edge of each script page
  card: '#e6b84a', // the cover stock
  cardDark: '#b98a2a', // the label's shadow and the rims of the punched holes
  cardInk: '#4a3510', // the small print on the cover (6.3:1 on the card)
  brass: '#a8812f', // the brads
  brassLight: '#e9cf82', // the glint on each brad
  stamp: '#8f231c', // the draft stamp (4.7:1 on the card)
};
// The hex as well as the id: design slots read only the hex (gotcha: palette-skips-designs).
const col = (id) => ({ hex: palette[id], model: 'hex', paletteId: id });
// The engine's defaults link to main-color: pointed at the ink, anything left unset prints black.
const colorPalette = Object.entries({ ...palette, 'main-color': palette.ink })
  .map(([id, hex]) => ({ id, name: id, value: { hex, model: 'hex' } }));
const TEXT = 'Courier Prime';
const IN = 25.4; // mm in an inch: the format is specified in inches
const LEAD = 12; // pt: 12-point Courier at six lines to the inch, so one line is one grid line
const at = (to, edge, x = 0, y = 0) => ({ anchor: { to, edge }, offset: { x: mm(x), y: mm(y) } });

// #region page: US Letter, a 1.5-inch binding margin, Courier 12 on 12, ragged right
const MARGIN = { top: 1, bottom: 1, left: 1.5, right: 1 }; // inches: the left one takes the brads
const page = { sizePreset: 'custom', width: mm(8.5 * IN), height: mm(11 * IN), dpi: 150,
  margins: { top: mm(MARGIN.top * IN), bottom: mm(MARGIN.bottom * IN),
    left: mm(MARGIN.left * IN), right: mm(MARGIN.right * IN) } };
const bodyText = { fontFamily: TEXT, fontSize: pt(12), lineHeight: pt(LEAD), color: col('ink'),
  textAlign: 'left', firstLineIndent: pt(0), // action: flush left, never justified
  paragraphSpacing: true, // a blank line between paragraphs
  // No :ref in this script, but one added later prints in ink, not the default link blue:
  // main-color does not reach this key (gotcha: palette-skips-designs).
  referenceColor: col('ink') };
// #endregion

// #region answer: a speech is a callout with no frame, padded to the 3.5-inch dialogue block
// Positions from the left edge of the sheet, in inches, as screenwriting software gives them.
const DIALOGUE = { left: 2.5, right: 6 }; // the block of speech, 3.5 inches wide
const CUE = 3.7; // the character's name
const TEXT_RIGHT = 8.5 - MARGIN.right; // 7.5: where action lines end
const CUE_LINE = 1.2 * 12; // pt: a callout title sits on a line 1.2 times its size
const dialogue = {
  id: 'dialogue',
  backgroundEnabled: false, // no fill and no border: the box is only a measure
  padding: { top: pt(LEAD - CUE_LINE), bottom: pt(0), // −2.4 pt: see the title below
    left: mm((DIALOGUE.left - MARGIN.left) * IN), // 1 inch in from the action
    right: mm((TEXT_RIGHT - DIALOGUE.right) * IN) }, // 1.5 inches short of it
  // The fence's title is the cue: title="Dora (cont’d)" prints DORA (CONT’D) at 3.7 inches,
  // in the headings' Courier, with no gap under it (the default is half a line). Its 14.4-pt
  // line starts 2.4 pt above the box, so a speech is a whole number of 12-pt lines and the
  // name sits 0.48 pt above its grid line.
  titleStyle: { fontWeight: 400, textTransform: 'uppercase',
    indent: mm((CUE - DIALOGUE.left) * IN), gap: pt(0) },
  body: { paragraphSpacing: false }, // no blank line before a parenthetical mid-speech
  marginTop: pt(LEAD), marginBottom: pt(LEAD), // one blank line above and below
  // Snapped to the grid, a box keeps its bottom margin and the next speech adds its top
  // margin: two blank lines between speeches. Unsnapped, the two margins collapse into one.
  snapToGrid: false,
};
// #endregion

// #region styles: parentheticals start at 3.1 inches; transitions end at the right margin
const PAREN = 3.1;
const paragraphStyles = [
  { id: 'paren', firstLineIndent: mm((PAREN - DIALOGUE.left) * IN) }, // inside a speech
  { id: 'transition', textAlign: 'right' }, // CUT TO:, flush with the action's right edge
];
// #endregion

// #region slugline: each scene heading carries its number in both margins
// Each number sits in a box half an inch wide, text aligned left, so that 9, 12 and an
// inserted 12A start at the same place on both sides.
const NUMBER_W = 0.5; // inches
const number = (id, edge, x) => ({ kind: 'text', id, content: '{number}', fontFamily: TEXT,
  fontSize: pt(12), fontWeight: 700, lineHeight: 1, color: col('ink'), align: 'left',
  placement: { ...at('container', edge, x * IN), size: { width: mm(NUMBER_W * IN) } } });
// The heading's own text is not painted but still measured: at the level's default 15 pt,
// scene 1's heading would wrap and reserve a second line.
const slugline = { level: 2, fontSize: pt(12), lineHeight: pt(LEAD),
  marginTop: pt(2 * LEAD), marginBottom: pt(LEAD), // two blank lines above, one below
  numberingTemplate: '{2}', // the scene count, which {number} prints
  advancedDesign: { enabled: true, slot: { elements: [
    { kind: 'text', id: 'heading', content: '{titleText}', fontFamily: TEXT, fontSize: pt(12),
      fontWeight: 700, lineHeight: 1, color: col('ink'), align: 'left', overflow: 'wrap',
      placement: { ...at('container', 'top-left'), size: { width: 'fill' } } },
    number('left', 'top-left', -0.6), // starts at 0.9 inches from the edge of the sheet
    number('right', 'top-right', 0.25 + NUMBER_W), // starts a quarter inch past the text
  ] } } };
const headings = {
  // The family of the speech titles, and the one the headings' unpainted text is measured
  // in (left unset, a sixth face, Open Sans Bold, would be loaded for nothing).
  fontFamily: TEXT,
  // Script pages end where the last whole speech or paragraph ends. Balancing would add
  // blank lines above sluglines to fill them, and push a closing speech to the foot
  // (gotcha: balancing-drops-last-box).
  balancing: { enabled: false },
  levels: [
    // Any headings object drops the H1 page break (gotcha: headings-drop-h1-break).
    { level: 1, breakBefore: { enabled: true, parity: 'any' } },
    slugline,
  ] };
// #endregion

// #region furniture: the script's pages are punched, and numbered from page 2 on
// Three holes down the bound edge, 4.25 inches apart, as a three-hole punch leaves them.
const HOLES = [1.25, 5.5, 9.75].map((y) => y * IN); // mm: hole centres from the top
const EDGE = 0.375 * IN; // mm: from the bound edge to the centre of each hole
const HOLE = 7; // mm across
const punched = HOLES.map((y, i) => ({ kind: 'box', id: `punch${i}`,
  style: { backgroundColor: col('hole'), borderRadius: mm(HOLE / 2) },
  placement: { ...at('page', 'top-left', EDGE - HOLE / 2, y - HOLE / 2),
    size: { width: mm(HOLE), height: mm(HOLE) } } }));
// The script's first page opens with its title, an H1 that breaks the page, so the page is
// an 'opener' and pages: 'body' leaves it unnumbered, as the format asks.
const folio = { kind: 'text', id: 'folio', content: '{pageNumber}.', pages: 'body',
  fontFamily: TEXT, fontSize: pt(12), color: col('ink'), align: 'right',
  placement: at('page', 'top-right', -MARGIN.right * IN, 0.5 * IN) };
// The title's style carries the header of its section: the pages from the title to the end.
const title = { id: 'script', header: { elements: [...punched, folio] },
  advancedDesign: { enabled: true, slot: { elements: [
    { kind: 'text', id: 'title', content: '{titleText}', fontFamily: TEXT, fontSize: pt(12),
      lineHeight: 1, textTransform: 'uppercase', color: col('ink'), align: 'center',
      placement: { ...at('container', 'top'), size: { width: 'fill' } } },
  ] } }, // H1's own line, 1.2 × 18 pt, would reserve 21.6 pt and drop FADE IN: 9.6 pt
  lineHeight: pt(LEAD), marginBottom: pt(LEAD) };
// #endregion

// #region art: the card covers: a three-hole punch, brass brads, a typed label, two stamps
const [W, H] = [8.5 * IN, 11 * IN]; // mm: the sheet
const PT = 25.4 / 72; // mm in a point
const box = (id, x, y, w, h, style) => ({ kind: 'box', id, style,
  placement: { ...at('page', 'top-left', x, y), size: { width: mm(w), height: mm(h) } } });
const circle = (id, cx, cy, d, style) => box(id, cx - d / 2, cy - d / 2, d, d,
  { ...style, borderRadius: mm(d / 2) });
const line = (id, content, x, y, w, style) => ({ kind: 'text', id, content, lineHeight: 1,
  ...style, placement: { ...at('page', 'top-left', x, y), size: { width: mm(w) } } });
const card = box('card', 0, 0, W, H, { backgroundColor: col('card') });
// Outside, a brass head in the top and bottom holes; the middle hole stays empty, as on
// studio scripts, and shows the white page under the cover.
const heads = HOLES.flatMap((y, i) => (i === 1
  ? [circle('hole', EDGE, y, HOLE, { backgroundColor: col('paper'),
    borderColor: col('cardDark'), borderWidth: pt(1) })]
  : [circle(`shade${i}`, EDGE + 0.5, y + 0.7, 11.5, { backgroundColor: col('cardDark') }),
    circle(`head${i}`, EDGE, y, 11, { backgroundColor: col('brass') }),
    circle(`glint${i}`, EDGE - 1.8, y - 1.8, 3.6, { backgroundColor: col('brassLight') })]));
// Inside, the holes are at the right edge, with the prongs of two brads through them.
const prongs = HOLES.flatMap((y, i) => [
  circle(`hole${i}`, W - EDGE, y, HOLE, { backgroundColor: col('cardInk') }),
  ...(i === 1 ? [] : [box(`prong${i}`, W - EDGE - 1.1, y - 4.2, 2.2, 8.4,
    { backgroundColor: col('brassLight'), borderRadius: mm(1.1) })]),
]);
const stamp = (id, x, y, w, h) => [
  box(id, x, y, w, h,
    { borderColor: col('stamp'), borderWidth: pt(1.8), borderRadius: mm(1.5) }),
  box(`${id}-rim`, x + 1.4, y + 1.4, w - 2.8, h - 2.8,
    { borderColor: col('stamp'), borderWidth: pt(0.6), borderRadius: mm(1) }),
];
const typed = (size) => ({ fontFamily: TEXT, fontSize: pt(size), color: col('ink') });
// Tracked capitals, centred. 1.4.1 centres a tracked line with the tracking after its last
// letter, half a unit left of the middle: the box moves right by that half.
const caps = (id, content, x, y, w, size, track, color) => line(id, content,
  x + (track * PT) / 2, y, w, { align: 'center', fontFamily: 'Oswald', fontWeight: 500,
    fontSize: pt(size), letterSpacing: pt(track), textTransform: 'uppercase', color: col(color) });
const small = { fontFamily: TEXT, fontSize: pt(7.5), color: col('cardInk'), align: 'left' };
const LABEL = { w: 120, h: 64, y: 78 }; // mm: a white label, centred across the sheet
const LABEL_X = (W - LABEL.w) / 2;
const DRAFT = { w: 56, h: 20 }; // mm: under the label, flush with its right edge
[DRAFT.x, DRAFT.y] = [LABEL_X + LABEL.w - DRAFT.w, LABEL.y + LABEL.h + 9];
const center = { align: 'center' };
// span: 'page' on both: kept in the column, the card is clipped an inch from the top and foot.
const cover = { id: 'cover', span: 'page',
  advancedDesign: { enabled: true, slot: { elements: [
    card, ...heads,
    box('shadow', LABEL_X + 1.2, LABEL.y + 1.4, LABEL.w, LABEL.h,
      { backgroundColor: col('cardDark'), borderRadius: mm(2) }),
    box('label', LABEL_X, LABEL.y, LABEL.w, LABEL.h,
      { backgroundColor: col('paper'), borderRadius: mm(2) }),
    line('name', '{titleText}', LABEL_X, LABEL.y + 15, LABEL.w, { ...center,
      fontFamily: 'Special Elite', fontSize: pt(32), textTransform: 'uppercase',
      color: col('ink') }),
    line('credit', '{attr.credit}', LABEL_X, LABEL.y + 37, LABEL.w, { ...center, ...typed(12) }),
    line('author', '{author}', LABEL_X, LABEL.y + 44, LABEL.w, { ...center, ...typed(12) }),
    ...stamp('draft-box', DRAFT.x, DRAFT.y, DRAFT.w, DRAFT.h),
    caps('draft', '{attr.draft}', DRAFT.x, DRAFT.y + 3.6, DRAFT.w, 15, 2.2, 'stamp'),
    caps('date', '{attr.date}', DRAFT.x, DRAFT.y + 12.4, DRAFT.w, 8.5, 1.6, 'stamp'),
    caps('company', '{attr.company}', 0, 250, W, 10, 3, 'cardInk'),
  ] } } };
const COPY = { w: 64, h: 24, x: IN, y: IN + 28 }; // mm: the copy number, under the notice
const flyleaf = { id: 'flyleaf', span: 'page', // the inside of the cover, facing script page 1
  advancedDesign: { enabled: true, slot: { elements: [
    card, ...prongs,
    line('notice', '{attr.notice}', IN, IN, 120, { ...typed(10), lineHeight: 1.3,
      color: col('cardInk'), align: 'left', overflow: 'wrap' }),
    ...stamp('copy-box', COPY.x, COPY.y, COPY.w, COPY.h),
    caps('copy', '{attr.copy}', COPY.x, COPY.y + 6.2, COPY.w, 26, 3.5, 'stamp'),
    line('colophon', '{attr.colophon}', IN, 250, 150, small),
    line('fonts', '{attr.fonts}', IN, 254.5, 150, small),
  ] } } };
// #endregion

const config = () => ({ // a factory: the engine caches resolved configs per object
  colorPalette,
  page,
  layout: { layoutType: 'single' },
  bodyText,
  headings,
  headingStyles: [cover, flyleaf, title],
  paragraphStyles,
  calloutStyles: [dialogue],
  // Empty slots: by default the header prints the section's title at the top of each cover
  // and the footer a page number at the foot of every page.
  header: { elements: [] },
  footer: { elements: [] },
});

// ─── 2 · Content ────────────────────────────────────────────────────────────
const markdown = String.raw`---
Mostra en Markdown · 166 línies · content.es.md
title: "Objetos perdidos"
author: "Maren Arrieta"
---

# Objetos perdidos {style="cover" credit="guion de" draft="Guion de rodaje" date="14 oct. 2026" company="Medialuz Producciones"}

# Aviso {style="flyleaf" notice="Este guion es propiedad de Medialuz Producciones y se presta al equipo técnico y artístico. Si lo encuentra, devuélvalo a la oficina de producción: calle del Huerto 40, Puerto Elera." copy="Copia 07" colophon="Guion original para el Recetario de Postext · CC BY 4.0" fonts="Compuesto en Courier Prime, Special Elite y Oswald"}

:::numbering{startAt=1}

# Objetos perdidos {style="script"}

FUNDIDO DE ENTRADA:

## INT. ESTACIÓN DE LA CALLE BRAÑOSA, VESTÍBULO — MAÑANA

La lluvia repiquetea en la cubierta de cristal. Los viajeros pasan en tropel bajo el panel de salidas.

TEO ANKRAH (24) avanza a contracorriente: esmoquin bajo un anorak empapado, la pajarita hecha un ovillo en un bolsillo, sin equipaje. Se para bajo un cartel. OBJETOS PERDIDOS, y una flecha escaleras abajo.

## INT. OFICINA DE OBJETOS PERDIDOS — CONTINUO

Un mostrador largo. Detrás, estanterías hasta el techo: paraguas por centenares, un patinete, un vestido de novia en su bolsa de tintorería, una garza disecada con resguardo.

DORA PELÁEZ (68), rebeca, gafas con cadenita, escribe en un libro registro con pluma estilográfica. No levanta la vista.

:::callout{type="dialogue" title="Teo"}
Buenos días. Me dejé un violonchelo en el último tren de Puerto Elera. El de las 23.40.
:::

:::callout{type="dialogue" title="Dora"}
:::paragraphs{style="paren"}
(pasando una página)
:::
¿Qué coche?
:::

:::callout{type="dialogue" title="Teo"}
El primero. Junto a la puerta.
:::

:::callout{type="dialogue" title="Dora"}
¿De qué color es la funda?
:::

:::callout{type="dialogue" title="Teo"}
Negra.
:::

:::callout{type="dialogue" title="Dora"}
Todas son negras.
:::

:::callout{type="dialogue" title="Teo"}
:::paragraphs{style="paren"}
(pausa)
:::
Tiene una pegatina en la tapa. Un faro, medio despegado.
:::

Dora lo apunta y le pasa un impreso de reclamación.

:::callout{type="dialogue" title="Dora"}
Nombre y dirección. En mayúsculas.
:::

Él lo rellena. Ella lo lee del revés mientras escribe.

:::callout{type="dialogue" title="Dora (cont.)"}
¿Y en el bolsillo de la tapa?
:::

Teo deja de escribir.

:::callout{type="dialogue" title="Teo"}
Resina. Un la de repuesto.
:::paragraphs{style="paren"}
(luego)
:::
Y una carta.
:::

:::callout{type="dialogue" title="Dora"}
¿Dirigida a quién?
:::

:::callout{type="dialogue" title="Teo"}
A nadie, todavía.
:::

Dora se quita las gafas. Lo mira.

:::callout{type="dialogue" title="Dora"}
Espere aquí.
:::

## INT. OFICINA DE OBJETOS PERDIDOS, ALMACÉN — CONTINUO

Los fluorescentes se encienden a trompicones, pasillo a pasillo. Bicicletas. Maletas. Un cajón de guantes desparejados con el rótulo IZQUIERDOS.

Dora recorre el pasillo y se detiene ante la funda de un violonchelo. Una pegatina con un faro, medio despegada. En el asa, una etiqueta parda: PUERTO ELERA 23.40, COCHE 1.

Abre el bolsillo de la tapa. Una pastilla de resina. Una cuerda en su sobre de papel. Un sobre blanco, cerrado, sin nada escrito.

Sopesa el sobre en la mano y vuelve a guardarlo.

## INT. OFICINA DE OBJETOS PERDIDOS — CONTINUO

Dora deja la funda sobre el mostrador. Teo va a cogerla. Ella mantiene la mano sobre la tapa.

:::callout{type="dialogue" title="Dora"}
Tóqueme algo.
:::

:::callout{type="dialogue" title="Teo"}
¿Aquí?
:::

:::callout{type="dialogue" title="Dora"}
En primavera un señor reclamó un arpa. No supo decirme cuántas cuerdas tenía.
:::

A la espalda de Teo se ha formado una cola: una MUJER con un carrito de bebé, un ADOLESCENTE con una sola bota de fútbol.

Teo abre los cierres, se sienta en el borde de una silla de plástico y toca los primeros compases del preludio de la primera suite para violonchelo de Bach.

Silencio en la oficina. El adolescente baja la bota.

Dora espera a que acabe la frase. Luego estampa un sello en el impreso: DEVUELTO.

:::callout{type="dialogue" title="Dora"}
Firme aquí.
:::

Él firma. Ella saca el sobre del bolsillo y se lo tiende.

:::callout{type="dialogue" title="Dora (cont.)"}
Y eche esto al correo. En el buzón de la entrada recogen a las cinco.
:::

:::callout{type="dialogue" title="Teo"}
:::paragraphs{style="paren"}
(sonriendo)
:::
No he escrito para quién es.
:::

:::callout{type="dialogue" title="Dora"}
Tiene hasta las cinco.
:::

:::paragraphs{style="transition"}
CORTE A:
:::

## EXT. ESTACIÓN DE LA CALLE BRAÑOSA — DÍA

Ha dejado de llover. Teo, con el violonchelo a la espalda, se para ante un buzón amarillo: ÚLTIMA RECOGIDA 17.00 h.

Escribe un nombre en el sobre, lo sostiene un momento en la ranura y lo suelta.

Se sube el violonchelo al hombro y va hacia el autobús.

:::paragraphs{style="transition"}
FUNDIDO A NEGRO.
:::
`; // content.<lang>.md, inlined by the Cookbook

// ─── 3 · Fonts ──────────────────────────────────────────────────────────────
const FONTS = {
  'Courier Prime': ['400', '700'], // the script, the typed label and the colophon
  'Special Elite': ['400'], // the title typed on the label
  Oswald: ['500'], // the stamps and the company
};

// ─── 4 · Build & show ───────────────────────────────────────────────────────
await loadFonts(FONTS, markdown);
const doc = await buildWithFonts(() => buildDocument({ markdown }, config()), markdown);
showPages(doc, { title: t({ en: 'Lost Property · a short film',
  es: 'Objetos perdidos · un cortometraje' }) });

Kit · core, fonts, viewer: igual a totes les receptes · 235 línies
// ─── Kit ── helpers shared by every Cookbook recipe · postext.dev/cookbook ─────

// ─── Kit · core v1 ── the same in every recipe · postext.dev/cookbook ─────────
function mm(value) { return { value, unit: 'mm' }; }
function pt(value) { return { value, unit: 'pt' }; }
function em(value) { return { value, unit: 'em' }; }
/** The sample language's string: t({ en: 'Figure', es: 'Figura' }). */
function t(strings) { return strings[LANG] ?? Object.values(strings)[0]; }
/** A file in this recipe's assets folder, served from the Postext repo by jsDelivr. */
function asset(file) { return `https://cdn.jsdelivr.net/gh/drnachio/postext@main/cookbook/${RECIPE}/assets/${file}`; }

// ─── Kit · fonts v1 ── the same in every recipe · postext.dev/cookbook ────────
// Postext measures text with the faces the browser has loaded, and caches the
// widths, so every face must be ready before the first build. Faces come from
// Fontsource: the same static files the PDF embeds, so screen and PDF agree.

/** faces = { 'Family Name': ['400', '400i', '700'] }. `text` is the sample:
 *  letters beyond Latin-1 (č, ł, ő…) also load the latin-ext files. With
 *  `optional`, a face Fontsource does not ship is skipped instead of failing.
 *  Resolves to the number of faces added. */
async function loadFonts(faces, text = '', { optional = false } = {}) {
  kitStatus('Loading fonts…');
  const ranges = {
    latin: 'U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,'
      + 'U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD',
    'latin-ext': 'U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,'
      + 'U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF',
  };
  const subsets = /[Ā-˿Ḁ-ỿ]/.test(text) ? ['latin', 'latin-ext'] : ['latin'];
  const jobs = [];
  let added = 0;
  for (const [family, specs] of Object.entries(faces)) {
    const id = fontsourceId(family);
    const meta = optional ? await fontsourceMeta(family) : null;
    for (const spec of new Set(specs)) {
      const weight = parseInt(spec, 10);
      const style = spec.endsWith('i') ? 'italic' : 'normal';
      if (hasFace(family, weight, style)) continue;
      if (optional && !(meta?.weights.includes(weight) && meta.styles.includes(style))) continue;
      for (const subset of subsets) {
        const url = `https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/files/${id}-${subset}-${weight}-${style}.woff2`;
        const face = new FontFace(family, `url(${url}) format('woff2')`,
          { weight: String(weight), style, unicodeRange: ranges[subset] });
        jobs.push(face.load().then((ready) => { document.fonts.add(ready); added++; }, () => {
          if (subset === 'latin' && !optional) throw new Error(`Fontsource has no ${family} ${weight} ${style}`);
        }));
      }
    }
  }
  await Promise.all(jobs).catch((error) => { kitFail(error); throw error; });
  return added;
}

/** Runs `build` (a buildDocument or buildBundle call) and checks the faces
 *  the pages use. A regular face missing from FONTS is loaded with a warning;
 *  bold and italic variants are loaded when the family ships them. Then the
 *  measurement caches are cleared and the build runs again. */
async function buildWithFonts(build, text = '') {
  const tried = new Set();
  for (let round = 0; round < 3; round++) {
    kitStatus('Laying out…');
    await new Promise(requestAnimationFrame);          // let the status paint first
    const result = await Promise.resolve().then(build).catch((error) => { kitFail(error); throw error; });
    const wanted = { base: {}, variants: {} };
    for (const { font, base } of [result].flat().flatMap(fontStringsOf)) {
      const { family, weight, style } = parseFont(font);
      const key = `${family}|${weight}|${style}`;
      if (tried.has(key) || hasFace(family, weight, style)) continue;
      tried.add(key);
      (wanted[base ? 'base' : 'variants'][family] ??= []).push(`${weight}${style === 'italic' ? 'i' : ''}`);
    }
    if (Object.keys(wanted.base).length) {
      console.warn(`[cookbook] FONTS does not list ${JSON.stringify(wanted.base)}: loading them.`);
    }
    const added = await loadFonts(wanted.base, text) + await loadFonts(wanted.variants, text, { optional: true });
    if (added === 0) return result;
    clearMeasurementCache();
  }
  throw new Error('The fonts did not settle after three builds.');
}

/** Every font string of the layout. `base` marks a block's own face; its
 *  bold, italic and bold-italic variants are listed whether or not used. */
function fontStringsOf(doc) {
  const found = new Map();
  const walk = (node) => {
    if (!node || typeof node !== 'object') return;
    if (Array.isArray(node)) { node.forEach(walk); return; }
    for (const [key, value] of Object.entries(node)) {
      if (typeof value === 'string' && /fontString$/i.test(key)) {
        found.set(value, found.get(value) || key === 'fontString');
      } else if (value && typeof value === 'object') walk(value);
    }
  };
  walk(doc.pages);
  walk(doc.blocks);
  return [...found].map(([font, base]) => ({ font, base }));
}

/** '700 37.5px Open Sans' / 'italic 400 13px "Source Serif 4"' → { family, weight, style }.
 *  A string with no weight ('95.8px Young Serif', from a design text) is 400. */
function parseFont(font) {
  const m = /^(?:(italic|oblique)\s+)?(?:small-caps\s+)?(?:(\d+|bold|normal)\s+)?[\d.]+px\s+(.+)$/.exec(font.trim());
  if (!m) throw new Error(`Unexpected font string: ${font}`);
  const weight = m[2] === 'bold' ? 700 : !m[2] || m[2] === 'normal' ? 400 : Number(m[2]);
  return { family: m[3].replace(/^["']|["']$/g, ''), weight, style: m[1] ? 'italic' : 'normal' };
}

/** True when a loaded FontFace covers exactly this family, weight and style
 *  (document.fonts.check() is also true for families nobody declared). */
function hasFace(family, weight, style) {
  for (const face of document.fonts) {
    if (face.status !== 'loaded' || face.style !== style) continue;
    if (face.family.replace(/^["']|["']$/g, '') !== family) continue;
    const [low, high = low] = face.weight.split(' ').map(Number);
    if (weight >= low && weight <= high) return true;
  }
  return false;
}

/** Fontsource's id for a family: 'Source Serif 4' → 'source-serif-4'. */
function fontsourceId(family) { return family.toLowerCase().replace(/\s+/g, '-'); }

/** The weights and styles a family ships ({ weights: [400, 700], styles: ['normal', 'italic'] }), or null. */
function fontsourceMeta(family) {
  fontsourceMeta.cache ??= new Map();
  const id = fontsourceId(family);
  if (!fontsourceMeta.cache.has(id)) {
    fontsourceMeta.cache.set(id, fetch(`https://api.fontsource.org/v1/fonts/${id}`)
      .then((res) => (res.ok ? res.json() : null), () => null));
  }
  return fontsourceMeta.cache.get(id);
}

// ─── Kit · viewer v1 ── the same in every recipe · postext.dev/cookbook ───────
/** Shows the pages as facing spreads on a dark desk: the first page is a
 *  recto on its own, then verso | recto pairs, as in a bound book. Pages
 *  are painted when they scroll near the screen. */
function showPages(docs, { title, width = 460 } = {}) {
  const root = viewer(title);
  const pages = [docs].flat().flatMap((doc) =>
    doc.pages.map((page) => ({ doc, page, n: (doc.pageIndexOffset ?? 0) + page.index })));
  const spreads = [];
  let verso = null;
  for (const p of pages) {
    if (p.n % 2 === 1) { if (verso) spreads.push([verso, null]); verso = p; }
    else { spreads.push([verso, p]); verso = null; }
  }
  if (verso) spreads.push([verso, null]);
  const density = Math.min(window.devicePixelRatio || 1, 2);
  showPages.painter?.disconnect();
  const painter = new IntersectionObserver((entries) => {
    for (const { isIntersecting, target } of entries) {
      if (!isIntersecting) continue;
      painter.unobserve(target);
      const { doc, page } = target.postext;
      renderPageToCanvas(page, doc, target, { scale: (width * density) / page.width });
    }
  }, { rootMargin: '800px' });
  showPages.painter = painter;
  root.replaceChildren(...spreads.map((pair) => {
    const spread = document.createElement('div');
    spread.className = 'pt-spread';
    for (const p of pair) {
      const figure = document.createElement('figure');
      if (p) {
        const label = p.page.pageLabel || String(p.n + 1);
        const canvas = document.createElement('canvas');
        canvas.postext = p;
        canvas.style.aspectRatio = `${p.page.width} / ${p.page.height}`;
        canvas.setAttribute('role', 'img');
        canvas.setAttribute('aria-label', `Page ${label}`);
        const folio = document.createElement('figcaption');
        folio.textContent = label;
        figure.append(canvas, folio);
        painter.observe(canvas);
      } else figure.className = 'pt-blank';
      spread.append(figure);
    }
    return spread;
  }));
  kitStatus(`${pages.length} ${pages.length === 1 ? 'page' : 'pages'}`);
  document.documentElement.dataset.postext = 'ready';
  return pages.length;
}

/** The desk, the bar and the error reporting, created once. */
function viewer(title) {
  if (!document.getElementById('pt-kit')) {
    document.head.insertAdjacentHTML('beforeend', `<style id="pt-kit">
      :root { color-scheme: dark; }
      body { margin: 0; background: #0e1014; color: #b9bcc4; font: 13px/1.45 system-ui, sans-serif; }
      #pt-bar { position: sticky; top: 0; z-index: 1; display: flex; flex-wrap: wrap; align-items: center;
        gap: 6px 16px; padding: 10px 16px; background: rgb(14 16 20 / .92); backdrop-filter: blur(6px);
        border-bottom: 1px solid #23262d; }
      #pt-bar strong { color: #f4f1ea; font-weight: 600; }
      #pt-actions { display: flex; gap: 12px; margin-left: auto; }
      #pt-actions a, #pt-actions button { color: #d8a21a; font: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
      #pages { display: grid; justify-items: center; gap: 48px; padding: 32px 16px 72px; }
      .pt-spread { display: flex; }
      .pt-spread figure { margin: 0; width: min(460px, 44vw); }
      .pt-spread canvas { display: block; width: 100%; background: #fff;
        box-shadow: 0 1px 2px rgb(0 0 0 / .5), 0 22px 44px -16px rgb(0 0 0 / .8); }
      .pt-spread figure:first-child canvas { box-shadow: inset -14px 0 14px -14px rgb(0 0 0 / .18), 0 1px 2px rgb(0 0 0 / .5), 0 22px 44px -16px rgb(0 0 0 / .8); }
      .pt-spread figcaption { margin-top: 10px; text-align: center; font: 600 10px/1 system-ui, sans-serif;
        letter-spacing: .18em; text-transform: uppercase; color: #6c7079; }
      .pt-blank { visibility: hidden; }
      @media (max-width: 760px) {
        .pt-spread { flex-direction: column; gap: 32px; }
        .pt-spread figure { width: min(460px, 92vw); }
        .pt-blank { display: none; }
      }
    </style>`);
    document.body.insertAdjacentHTML('afterbegin',
      '<header id="pt-bar"><strong id="pt-title"></strong><span id="pt-status" role="status"></span><span id="pt-actions"></span></header>');
    document.getElementById('pt-title').textContent = document.title || 'Postext';
    addEventListener('error', (event) => kitFail(event.error ?? event.message));
    addEventListener('unhandledrejection', (event) => kitFail(event.reason));
  }
  if (title) document.getElementById('pt-title').textContent = title;
  return document.getElementById('pages')
    ?? document.body.appendChild(Object.assign(document.createElement('main'), { id: 'pages' }));
}

function kitStatus(text) {
  viewer();
  document.getElementById('pt-status').textContent = text;
}

function kitFail(error) {
  document.documentElement.dataset.postext = 'error';
  kitStatus(`Error: ${error?.message ?? error}`);
}

// ─── /Kit ───────────────────────────────────────────────────────────────────────