/* pgk-web · macrostructure: foliated-ledger (running heads + margin column + closing letter) · genre: editorial-archival · theme: studied-DNA (source: site/studio/reference-dossier.md) · nav: N-masthead-note · footer: Ft-colophon */
/* pgk-web · critique: F5 J4 E4 E5 R4 V5 */
/* pgk-web · gates: pass (1-58, barrido manual) · contrast: pass (axe-core 4.10 wcag2aa, 1280 y 375) · nav: masthead · footer: colophon · mobile: pass (34,49,50-57) */

:root {
  /* colour */
  --c-paper: oklch(0.955 0.017 78);
  --c-paper-2: oklch(0.925 0.022 76);
  --c-ink: oklch(0.2 0.018 12);
  --c-ink-2: oklch(0.43 0.02 30);
  --c-rule: oklch(0.2 0.018 12 / 0.16);
  --c-accent: #6D0D1E;
  --c-accent-ink: oklch(0.96 0.02 80);
  --c-night: #1F1F13;
  --c-night-2: oklch(0.3 0.09 15);
  --c-ivory: #F6F1E6;
  --c-ivory-2: oklch(0.88 0.03 75);
  --c-gold: #B87333;
  --c-gold-ink: oklch(0.47 0.1 50);
  --c-focus: #6D0D1E;
  --c-focus-night: #B87333;
  --c-gold-night: oklch(0.74 0.1 55);
  --c-ok: oklch(0.45 0.09 150);
  --c-err: oklch(0.5 0.17 28);
  --c-ok-night: oklch(0.85 0.1 140);
  --c-err-night: oklch(0.8 0.1 40);

  /* type */
  --f-display: "Cormorant Garamond", "Iowan Old Style", Georgia, serif;
  --f-text: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --f-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* space (4px scale) */
  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px; --s-5: 20px; --s-6: 24px;
  --s-8: 32px; --s-10: 40px; --s-12: 48px; --s-16: 64px; --s-20: 80px; --s-24: 96px; --s-32: 128px;
  --gutter: var(--s-12);
  --measure: 62ch;
  --control: 48px;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { overflow-x: clip; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--c-paper);
  color: var(--c-ink);
  font-family: var(--f-text);
  font-size: 18px;
  line-height: 1.6;
  font-variant-numeric: oldstyle-nums;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, p, ol, dl, dd, figure, pre { margin: 0; }
img { display: block; max-width: 100%; }
a { color: inherit; }
a:focus-visible, button:focus-visible, input:focus-visible, pre:focus-visible { outline: 2px solid var(--c-focus); outline-offset: 2px; }
code, samp, pre { font-family: var(--f-mono); font-size: 0.8em; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.pgk-grain::after { opacity: 0.045; }

/* ---------- masthead ---------- */
.masthead {
  display: flex;
  align-items: center;
  gap: var(--s-6);
  padding: var(--s-4) var(--gutter);
  border-bottom: 1px solid var(--c-rule);
  line-height: 1;
}
.masthead__brand { display: flex; align-items: center; text-decoration: none; }
.masthead__brand img { height: 60px; width: auto; }
.masthead__note { margin-left: auto; font-variant-caps: all-small-caps; letter-spacing: 0.1em; color: var(--c-ink-2); font-size: 17px; }
.masthead__link {
  font-size: 16px; white-space: nowrap; text-decoration: underline; text-decoration-thickness: 1px;
  text-underline-offset: 4px; color: var(--c-accent); padding: var(--s-2) 0;
}
.masthead__link:hover { text-decoration-thickness: 2px; }
.masthead__link:active { color: var(--c-ink); }

/* ---------- folio + running head ---------- */
.folio { padding: var(--s-16) var(--gutter) var(--s-20); max-width: 1440px; margin-inline: auto; scroll-margin-top: 72px; }
.letter { scroll-margin-top: 72px; }
.folio + .folio { border-top: 1px solid var(--c-rule); }
.runhead {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--s-2) var(--s-6);
  margin-bottom: var(--s-10);
  font-variant-caps: all-small-caps; font-variant-numeric: lining-nums tabular-nums;
  letter-spacing: 0.12em; font-size: 16px; color: var(--c-gold-ink); line-height: 1.2;
}
.runhead span:first-child { color: var(--c-accent); font-weight: 600; }
.folio--hero .runhead span:first-child { color: var(--c-ink-2); }
.runhead__date { margin-left: auto; }

.display {
  font-family: var(--f-display); font-weight: 500;
  font-size: clamp(44px, 5.4vw, 80px); line-height: 1.02; letter-spacing: -0.012em;
  overflow-wrap: anywhere; min-width: 0; text-wrap: balance;
}
.heading {
  font-family: var(--f-display); font-weight: 600;
  font-size: clamp(32px, 3.4vw, 48px); line-height: 1.08; letter-spacing: -0.005em;
  overflow-wrap: anywhere; min-width: 0; text-wrap: balance; max-width: 22ch;
}
.heading--wide { max-width: 30ch; }

/* ---------- hero ---------- */
.folio--hero { padding-top: var(--s-10); padding-bottom: var(--s-16); }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 340px); gap: var(--s-16); align-items: start; }
.hero__main { max-width: 820px; }
.hero__main .display { max-width: 15ch; }
.lede { margin-top: var(--s-6); max-width: 54ch; font-size: 20px; line-height: 1.55; }

.entry { margin-top: var(--s-10); padding-top: var(--s-4); border-top: 2px solid var(--c-accent); max-width: var(--measure); }
.entry__meta { display: flex; flex-wrap: wrap; gap: var(--s-1) var(--s-5); font-variant-caps: all-small-caps; letter-spacing: 0.08em; color: var(--c-ink-2); font-size: 16px; }
.entry__meta code { font-size: 13px; letter-spacing: 0; align-self: center; font-variant-caps: normal; }
.entry__title { font-family: var(--f-display); font-weight: 600; font-size: 30px; line-height: 1.15; margin: var(--s-2) 0 var(--s-3); }
.stamp {
  display: table; margin-top: var(--s-2);
  font-family: var(--f-text); font-weight: 600; font-size: 13px; line-height: 1;
  font-variant-caps: all-small-caps; font-variant-numeric: lining-nums; letter-spacing: 0.1em;
  color: var(--c-accent); border: 1px solid var(--c-accent); padding: var(--s-1) var(--s-2);
  white-space: nowrap;
}
.entry__old { color: var(--c-ink-2); }
.entry__old span {
  background-image: linear-gradient(var(--c-accent), var(--c-accent));
  background-repeat: no-repeat; background-position: 0 58%; background-size: 100% 1.5px;
}
.entry__new { margin-top: var(--s-1); }

.hero__margin { padding-top: var(--s-4); padding-left: var(--s-8); border-left: 1px solid var(--c-rule); }
.note { font-size: 15px; line-height: 1.55; color: var(--c-ink-2); max-width: 45ch; }
.sign { margin-top: var(--s-3); font-family: var(--f-display); font-weight: 500; font-size: 24px; color: var(--c-accent); }


/* ---------- unlock form ---------- */
.unlock { margin-top: var(--s-10); }
.unlock label { display: block; margin-bottom: var(--s-2); font-variant-caps: all-small-caps; letter-spacing: 0.1em; font-size: 16px; color: var(--c-ink-2); }
.unlock__row { display: flex; }
.unlock input {
  flex: 1; min-width: 0; height: var(--control); padding: 0 var(--s-3);
  border: 1px solid var(--c-ink); border-right: 0; border-radius: 0;
  background: var(--c-paper-2); color: var(--c-ink);
  font-family: var(--f-mono); font-size: 14px; letter-spacing: 0.06em; text-transform: uppercase;
}
.unlock input::placeholder { color: var(--c-ink-2); opacity: 0.7; }
.unlock input:focus-visible { outline: 2px solid var(--c-focus); outline-offset: 1px; }
.unlock input:disabled { opacity: 0.6; cursor: not-allowed; }
.unlock button {
  height: var(--control); padding: 0 var(--s-5); border: 1px solid var(--c-accent); border-radius: 0;
  background: var(--c-accent); color: var(--c-accent-ink); font-family: var(--f-text); font-size: 16px; line-height: 1;
  white-space: nowrap; cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease;
}
.unlock button:hover { background: var(--c-night); }
.unlock button:active { background: var(--c-ink); }
.unlock button:disabled { opacity: 0.55; cursor: progress; }
.unlock__status { min-height: 1lh; margin-top: var(--s-2); font-size: 14px; line-height: 1.5; color: var(--c-ink-2); }
.unlock__status[data-state="error"] { color: var(--c-err); }
.unlock__status[data-state="ok"] { color: var(--c-ok); }
.unlock--compact input { font-size: 13px; }

/* ---------- folio 2: prose ---------- */
.prose { max-width: var(--measure); margin-left: clamp(0px, 12vw, 200px); }
.prose p { margin-top: var(--s-5); font-size: 20px; }
.prose .heading { margin-bottom: var(--s-2); }
.prose__turn { padding-left: var(--s-5); border-left: 2px solid var(--c-gold); }

/* ---------- folio 3: timeline ---------- */
.timeline { list-style: none; padding: 0; margin-top: var(--s-12); display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--c-ink); }
.timeline__ev { position: relative; padding: var(--s-6) var(--s-6) 0 0; }
.timeline__ev::before {
  content: ""; position: absolute; z-index: 1; top: -7px; left: 0; width: 12px; height: 12px;
  border: 1px solid var(--c-ink); border-radius: 50%; background: var(--c-paper);
}
.timeline__ev time { display: block; font-variant-numeric: lining-nums tabular-nums; font-size: 15px; color: var(--c-ink-2); }
.timeline__state { display: block; margin-top: var(--s-1); font-variant-caps: all-small-caps; letter-spacing: 0.1em; font-size: 15px; color: var(--c-accent); font-weight: 600; }
.timeline__ev h3 { margin: var(--s-2) 0; font-family: var(--f-display); font-weight: 600; font-size: 23px; line-height: 1.15; }
.timeline__ev p { font-size: 16px; color: var(--c-ink-2); max-width: 32ch; }
.timeline__ev.is-past h3 { color: var(--c-ink-2); text-decoration: line-through; text-decoration-color: var(--c-accent); text-decoration-thickness: 1.5px; }
/* pgk-motion deja clip-path: inset(0) en el estado revelado y recortaría el punto del hito. */
.pgk-motion-active .timeline__ev.pgk-motion-in { clip-path: none; }
.timeline__ev.is-now::before { background: var(--c-accent); border-color: var(--c-accent); }
.timeline__ev.is-next::before { border-style: dashed; }

/* ---------- folio 4: minutes ---------- */
.use { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: var(--s-16); }
.use__intro p { margin-top: var(--s-5); max-width: 46ch; }
.use__small { font-size: 15px; color: var(--c-ink-2); }
.minutes { list-style: none; padding: 0; counter-reset: m; }
.minutes li { counter-increment: m; padding: var(--s-5) 0; border-top: 1px solid var(--c-rule); }
.minutes li:first-child { border-top: 0; padding-top: 0; }
.minutes__label { font-variant-caps: all-small-caps; letter-spacing: 0.1em; color: var(--c-accent); font-weight: 600; margin-bottom: var(--s-2); }
.minutes__label::before { content: counter(m, upper-roman) ". "; }
.minutes pre {
  overflow-x: auto; padding: var(--s-4) var(--s-5); background: var(--c-paper-2);
  border-left: 2px solid var(--c-gold); font-size: 13.5px; line-height: 1.6; color: var(--c-ink);
}
.minutes pre code, .minutes pre samp { font-size: inherit; }
.minutes pre.out { margin-top: var(--s-1); background: transparent; border-left-color: var(--c-accent); color: var(--c-accent); }

/* ---------- steps + dialogue ---------- */
.steps { margin-top: var(--s-6); padding-left: var(--s-6); max-width: 52ch; }
.steps li { padding: var(--s-2) 0 var(--s-3); }
.steps li::marker { font-family: var(--f-display); font-weight: 600; font-size: 22px; color: var(--c-accent); }
.dialogue { margin: 0; padding: var(--s-6) var(--s-8); background: var(--c-paper-2); border-left: 2px solid var(--c-gold); max-width: 60ch; }
.dialogue figcaption { font-variant-caps: all-small-caps; letter-spacing: 0.1em; color: var(--c-ink-2); font-size: 15px; margin-bottom: var(--s-3); }
.dialogue p { font-size: 17px; }
.dialogue p + .dialogue__who { margin-top: var(--s-4); }
.dialogue__who { font-variant-caps: all-small-caps; letter-spacing: 0.1em; font-weight: 600; font-size: 15px; color: var(--c-ink-2); }
.dialogue__who--ai { color: var(--c-accent); }

/* ---------- faq ---------- */
.faq details { border-bottom: 1px solid var(--c-rule); padding: var(--s-3) 0; max-width: var(--measure); }
.faq summary { cursor: pointer; font-family: var(--f-display); font-weight: 600; font-size: 22px; line-height: 1.25; list-style-position: outside; }
.faq summary:focus-visible { outline: 2px solid var(--c-focus); outline-offset: 2px; }
.faq details p { margin-top: var(--s-2); }

/* ---------- folio 5: table of contents ---------- */
.toc { margin-top: var(--s-10); columns: 2; column-gap: var(--s-16); }
.toc > div { break-inside: avoid; display: flex; align-items: baseline; gap: var(--s-2); padding: var(--s-3) 0; border-bottom: 1px dotted var(--c-rule); }
.toc dt { font-family: var(--f-display); font-weight: 600; font-size: 22px; line-height: 1.2; white-space: nowrap; }
.toc dt::after { content: ""; }
.toc dd { margin-left: auto; text-align: right; font-size: 15px; line-height: 1.4; color: var(--c-ink-2); max-width: 34ch; }

/* ---------- folio 6: ledger ---------- */
.folio--ledger { background: var(--c-paper-2); max-width: none; }
.folio--ledger > .ledger-wrap { max-width: 1344px; margin-inline: auto; }
.ledger { display: flex; flex-wrap: wrap; gap: var(--s-8) var(--s-20); align-items: baseline; }
.ledger__row { display: flex; align-items: baseline; gap: var(--s-3); }
.ledger__n { font-family: var(--f-display); font-weight: 500; font-size: clamp(56px, 7vw, 104px); line-height: 1; font-variant-numeric: lining-nums tabular-nums; color: var(--c-accent); }
.ledger__k { font-variant-caps: all-small-caps; letter-spacing: 0.1em; font-size: 18px; }
.ledger__foot { margin-top: var(--s-8); max-width: 60ch; font-size: 15px; color: var(--c-ink-2); }

/* ---------- folio 7: caveats ---------- */
.caveats { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: var(--s-16); }
.caveats ol { padding-left: var(--s-6); max-width: var(--measure); }
.caveats li { padding: var(--s-2) 0 var(--s-3); }
.caveats li::marker { font-family: var(--f-display); font-weight: 600; color: var(--c-accent); }
.caveats strong { font-weight: 600; }

/* ---------- folio 8: letter ---------- */
.letter {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  background: var(--c-night); color: var(--c-ivory);
}
.letter__seal { position: relative; overflow: hidden; min-height: 560px; border-right: 1px solid color-mix(in oklab, var(--c-gold) 45%, transparent); }
.letter__seal { display: grid; place-items: center; }
.letter__seal img { width: min(72%, 420px); }
.letter__body { padding: var(--s-24) var(--s-16); max-width: 640px; }
.letter__to { font-variant-caps: all-small-caps; letter-spacing: 0.14em; color: var(--c-gold-night); font-size: 16px; }
.display--letter { margin: var(--s-4) 0 var(--s-6); font-size: clamp(44px, 4.6vw, 72px); }
.letter__body > p { max-width: 48ch; color: var(--c-ivory-2); }
.letter .unlock { margin-top: var(--s-10); padding-top: var(--s-8); border-top: 1px solid color-mix(in oklab, var(--c-gold) 55%, transparent); }
.letter .unlock label { color: var(--c-gold-night); }
.letter .unlock input { background: transparent; color: var(--c-ivory); border-color: var(--c-gold); }
.letter .unlock input::placeholder { color: var(--c-ivory-2); opacity: 0.55; }
.letter .unlock input:focus-visible, .letter .unlock button:focus-visible { outline-color: var(--c-focus-night); }
.letter .unlock button { background: var(--c-ivory); color: var(--c-night); border-color: var(--c-ivory); }
.letter .unlock button:hover { background: var(--c-gold); border-color: var(--c-gold); }
.letter .unlock button:active { background: var(--c-ivory-2); }
.letter .unlock__status { color: var(--c-ivory-2); }
.letter .unlock__status[data-state="error"] { color: var(--c-err-night); }
.letter .unlock__status[data-state="ok"] { color: var(--c-ok-night); }
.letter__fine { margin-top: var(--s-6); font-size: 14px; }

/* ---------- colophon ---------- */
.colophon {
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-3) var(--s-6);
  padding: var(--s-8) var(--gutter); font-size: 14px; color: var(--c-ink-2); border-top: 1px solid var(--c-rule);
}
.colophon p { max-width: 70ch; }
.colophon strong { font-variant-caps: all-small-caps; letter-spacing: 0.08em; color: var(--c-ink); }

/* ---------- motion: supersession of the hero criterion ---------- */
.pgk-motion-active [data-supersede] .entry__old span { background-size: 0 1.5px; transition: background-size 900ms cubic-bezier(0.65, 0, 0.35, 1) 700ms; }
.pgk-motion-active [data-supersede] .entry__new,
.pgk-motion-active [data-supersede] .stamp { opacity: 0; transform: translate3d(0, 6px, 0); transition: opacity 500ms ease 1500ms, transform 500ms ease 1500ms; }
.pgk-motion-active [data-supersede] .stamp { transition-delay: 1850ms; }
.pgk-motion-active [data-supersede].is-done .entry__old span { background-size: 100% 1.5px; }
.pgk-motion-active [data-supersede].is-done .entry__new,
.pgk-motion-active [data-supersede].is-done .stamp { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* ---------- responsive ---------- */
@media (max-width: 64rem) {
  :root { --gutter: var(--s-8); }
  .hero { grid-template-columns: minmax(0, 1fr); gap: var(--s-8); }
  .hero__margin { border-left: 0; padding-left: 0; border-top: 1px solid var(--c-rule); padding-top: var(--s-6); display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--s-2) var(--s-8); }
  .hero__margin .unlock { grid-column: 2; grid-row: 1 / span 2; margin-top: 0; }
  .use, .caveats { grid-template-columns: minmax(0, 1fr); gap: var(--s-8); }
  .timeline { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: var(--s-10); }
  .toc { columns: 1; }
}
@media (max-width: 48rem) {
  :root { --gutter: var(--s-4); }
  body { font-size: 17px; }
  .masthead { gap: var(--s-3); padding-block: var(--s-3); }
  .masthead__brand img { height: 40px; }
  .masthead__note { display: none; }
  .masthead__link { margin-left: auto; font-size: 15px; }
  .folio { padding: var(--s-10) var(--gutter) var(--s-12); }
  .folio--hero { padding-top: var(--s-6); }
  .runhead { margin-bottom: var(--s-6); font-size: 15px; gap: var(--s-1) var(--s-4); }
  .runhead__date { margin-left: 0; }
  .display { font-size: 42px; line-height: 1.04; }
  .lede, .prose p { font-size: 18px; }
  .entry__title { font-size: 25px; }
  .hero__margin { display: block; }
  .hero__margin .unlock { margin-top: var(--s-6); }
  .prose { margin-left: 0; }
  .timeline { grid-template-columns: minmax(0, 1fr); border-top: 0; border-left: 1px solid var(--c-ink); margin-left: var(--s-2); row-gap: 0; }
  .timeline__ev { padding: 0 0 var(--s-8) var(--s-6); }
  .timeline__ev::before { top: 6px; left: -7px; }
  .toc > div { display: block; }
  .toc dt { white-space: normal; }
  .toc dd { text-align: left; margin-top: var(--s-1); }
  .ledger { gap: var(--s-4); flex-direction: column; }
  .letter { grid-template-columns: minmax(0, 1fr); }
  .letter__seal { min-height: 200px; border-right: 0; border-bottom: 1px solid color-mix(in oklab, var(--c-gold) 45%, transparent); }
  .letter__seal img { width: min(64%, 260px); }
  .letter__body { padding: var(--s-10) var(--gutter) var(--s-12); }
  .display--letter { font-size: 40px; }
  .unlock__row { flex-direction: column; }
  .unlock input { border-right: 1px solid var(--c-ink); }
  .letter .unlock input { border-right-color: var(--c-gold); }
  .unlock button { margin-top: var(--s-2); }
}

/* =====================================================================
   Motion v2: diagrama «cómo funciona» y efectos de escena.
   Todo lo que oculta algo depende de html.mo (JS activo y sin
   prefers-reduced-motion). Sin él, la página y el diagrama se ven en su
   estado final.
   ===================================================================== */

/* ---------- cabecera fija ---------- */
.masthead { position: sticky; top: 0; z-index: 50; background: var(--c-paper); transition: background-color 300ms ease, box-shadow 300ms ease; }
.masthead.is-scrolled { background: color-mix(in oklab, var(--c-paper) 90%, transparent); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); box-shadow: 0 1px 0 var(--c-rule); }

/* ---------- titular por líneas ---------- */
.display[data-lines] span { display: block; }
.mo .display[data-lines] span { animation: line-rise 900ms cubic-bezier(0.16, 1, 0.3, 1) both; }
.mo .display[data-lines] span:nth-child(2) { animation-delay: 90ms; }
.mo .display[data-lines] span:nth-child(3) { animation-delay: 180ms; }
.mo .display[data-lines] span:nth-child(4) { animation-delay: 270ms; }
@keyframes line-rise { from { opacity: 0; transform: translate3d(0, 0.5em, 0); clip-path: inset(0 0 100% 0); } to { opacity: 1; transform: none; clip-path: inset(0 0 -20% 0); } }

/* ---------- sello que se estampa ---------- */
.mo [data-supersede] .stamp { transition: none; }
.mo [data-supersede].is-done .stamp { animation: stamp-press 520ms cubic-bezier(0.2, 0.9, 0.3, 1) 1900ms both; }
@keyframes stamp-press { 0% { opacity: 0; transform: scale(1.6) rotate(-6deg); } 70% { opacity: 1; transform: scale(0.96) rotate(0.5deg); } 100% { opacity: 1; transform: none; } }

/* ---------- títulos que se desvelan ---------- */
.mo [data-reveal] { opacity: 0.001; transform: translate3d(0, 28px, 0); transition: opacity 700ms ease, transform 900ms cubic-bezier(0.16, 1, 0.3, 1); }
.mo [data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- índice en oleada ---------- */
.mo [data-stagger] > div { opacity: 0.001; transform: translate3d(0, 18px, 0); transition: opacity 500ms ease, transform 700ms cubic-bezier(0.16, 1, 0.3, 1); }
.mo [data-stagger].is-in > div { opacity: 1; transform: none; }
.mo [data-stagger].is-in > div:nth-child(2) { transition-delay: 60ms; }
.mo [data-stagger].is-in > div:nth-child(3) { transition-delay: 120ms; }
.mo [data-stagger].is-in > div:nth-child(4) { transition-delay: 180ms; }
.mo [data-stagger].is-in > div:nth-child(5) { transition-delay: 240ms; }
.mo [data-stagger].is-in > div:nth-child(6) { transition-delay: 300ms; }
.mo [data-stagger].is-in > div:nth-child(7) { transition-delay: 360ms; }
.mo [data-stagger].is-in > div:nth-child(8) { transition-delay: 420ms; }

/* ---------- cronología que se dibuja ---------- */
.timeline { position: relative; }
.mo .timeline[data-timeline] { border-top-color: transparent; }
.mo .timeline[data-timeline]::after { content: ""; position: absolute; left: 0; right: 0; top: -1px; height: 1px; background: var(--c-ink); transform: scaleX(0); transform-origin: left; transition: transform 1400ms cubic-bezier(0.65, 0, 0.35, 1); }
.mo .timeline[data-timeline].is-in::after { transform: scaleX(1); }
.mo .timeline[data-timeline] .timeline__ev.is-past h3 { text-decoration-color: transparent; transition: text-decoration-color 500ms ease 1300ms, color 500ms ease 1300ms; color: var(--c-ink); }
.mo .timeline[data-timeline].is-in .timeline__ev.is-past h3 { text-decoration-color: var(--c-accent); color: var(--c-ink-2); }
.mo .timeline[data-timeline].is-in .timeline__ev.is-now::before { animation: dot-ping 1600ms ease-out 1500ms 2; }
@keyframes dot-ping { 0% { box-shadow: 0 0 0 0 color-mix(in oklab, var(--c-accent) 45%, transparent); } 100% { box-shadow: 0 0 0 14px transparent; } }

/* ---------- conversación que se escribe ---------- */
.mo .chat-wait { opacity: 0; transform: translate3d(0, 8px, 0); }
.mo .chat-in { opacity: 1; transform: none; transition: opacity 400ms ease, transform 500ms cubic-bezier(0.16, 1, 0.3, 1); }
.mo .chat-typing { opacity: 1; transform: none; color: transparent; position: relative; }
.mo .chat-typing::after { content: "escribiendo…"; position: absolute; left: 0; top: 0; color: var(--c-ink-2); font-size: 15px; animation: typing 900ms ease-in-out infinite; }
@keyframes typing { 50% { opacity: 0.35; } }

/* ---------- botón con relleno ---------- */
.unlock button { background-image: linear-gradient(var(--c-night), var(--c-night)); background-repeat: no-repeat; background-size: 0% 100%; transition: background-size 380ms cubic-bezier(0.65, 0, 0.35, 1), color 160ms ease; }
.unlock button:hover { background-size: 100% 100%; }
.letter .unlock button { background-image: linear-gradient(var(--c-gold), var(--c-gold)); }

/* ---------- diagrama ---------- */
.folio--diagram { background: linear-gradient(var(--c-paper), var(--c-paper-2)); max-width: none; }
.folio--diagram > * { max-width: 1344px; margin-inline: auto; }
.dg { margin-top: var(--s-10); }
.dg-stage {
  position: relative; display: grid; align-items: center;
  grid-template-columns: minmax(0, 0.8fr) minmax(32px, 1fr) minmax(0, 1.2fr) minmax(32px, 1fr) minmax(0, 1.2fr);
  padding: var(--s-24) var(--s-4) var(--s-12); min-height: 420px;
}
.dg-node { position: relative; display: flex; flex-direction: column; align-items: center; gap: var(--s-2); text-align: center; }
.dg-label { font-family: var(--f-display); font-weight: 600; font-size: 22px; line-height: 1.1; }
.dg-person { width: 72px; height: 72px; fill: var(--c-ink); }
.dg-agent { padding: var(--s-6) var(--s-5) var(--s-5); border: 1.5px solid var(--c-ink); border-radius: 14px; background: var(--c-paper); box-shadow: 0 12px 30px -18px color-mix(in oklab, var(--c-ink) 60%, transparent); }
.dg-cal { position: absolute; top: -14px; right: var(--s-4); padding: var(--s-1) var(--s-2); background: var(--c-accent); color: var(--c-accent-ink); font-size: 13px; line-height: 1.2; font-variant-caps: all-small-caps; letter-spacing: 0.1em; border-radius: 4px; perspective: 200px; }
.dg-cal__m { display: inline-block; }
.dg-cal__m.is-flip { animation: cal-flip 600ms cubic-bezier(0.3, 0.7, 0.4, 1); }
@keyframes cal-flip { 0% { transform: rotateX(90deg); opacity: 0; } 100% { transform: none; opacity: 1; } }
.dg-names { display: block; height: 1.5em; overflow: hidden; font-size: 16px; line-height: 1.5; color: var(--c-accent); font-weight: 600; }
.dg-names__track { display: flex; flex-direction: column; }
.mo .dg.is-live .dg-names__track { animation: names 10s cubic-bezier(0.65, 0, 0.35, 1) infinite; }
@keyframes names { 0%, 16% { transform: translateY(0); } 20%, 36% { transform: translateY(-1.5em); } 40%, 56% { transform: translateY(-3em); } 60%, 76% { transform: translateY(-4.5em); } 80%, 96% { transform: translateY(-6em); } 100% { transform: translateY(-7.5em); } }
.dg-fresh { font-size: 13px; color: var(--c-ink-2); font-variant-caps: all-small-caps; letter-spacing: 0.1em; opacity: 0; transition: opacity 400ms ease; }
.dg[data-step="3"] .dg-fresh { opacity: 1; }
.dg-mem { padding: var(--s-8) var(--s-6) var(--s-5); border: 1.5px dashed color-mix(in oklab, var(--c-ink) 45%, transparent); border-radius: 18px; }
.dg-pc { position: absolute; top: -11px; left: var(--s-4); padding: 0 var(--s-2); background: var(--c-paper-2); font-size: 13px; color: var(--c-ink-2); font-variant-caps: all-small-caps; letter-spacing: 0.1em; }
.dg-tabula { width: 104px; height: auto; }
.dg-count { font-size: 14px; color: var(--c-ink-2); font-variant-numeric: lining-nums tabular-nums; }
.dg-count span { color: var(--c-accent); font-weight: 600; }
.dg-count.is-bump span { display: inline-block; animation: bump 700ms cubic-bezier(0.2, 0.9, 0.3, 1); }
@keyframes bump { 40% { transform: scale(1.35); } 100% { transform: none; } }
.mo .dg.is-live[data-step="2"] .dg-tabula { animation: tabula 900ms cubic-bezier(0.2, 0.9, 0.3, 1) 1300ms; }
@keyframes tabula { 40% { transform: scale(1.08) rotate(-2deg); } 100% { transform: none; } }

.dg-wire { position: relative; height: 2px; background: color-mix(in oklab, var(--c-ink) 22%, transparent); border-radius: 2px; }
.dg-pulse { position: absolute; top: -5px; left: 0; width: 12px; height: 12px; border-radius: 50%; background: var(--c-accent); opacity: 0; }
.mo .dg.is-live[data-step="1"] [data-wire="a"] .dg-pulse,
.mo .dg.is-live[data-step="3"] [data-wire="a"] .dg-pulse { animation: pulse-r 1100ms cubic-bezier(0.65, 0, 0.35, 1) 500ms 2; }
.mo .dg.is-live[data-step="2"] [data-wire="b"] .dg-pulse { animation: pulse-r 1100ms cubic-bezier(0.65, 0, 0.35, 1) 300ms; }
.mo .dg.is-live[data-step="4"] [data-wire="b"] .dg-pulse { animation: pulse-l 1100ms cubic-bezier(0.65, 0, 0.35, 1) 200ms; }
@keyframes pulse-r { 0% { opacity: 0; left: 0; } 15% { opacity: 1; } 85% { opacity: 1; } 100% { opacity: 0; left: calc(100% - 12px); } }
@keyframes pulse-l { 0% { opacity: 0; left: calc(100% - 12px); } 15% { opacity: 1; } 85% { opacity: 1; } 100% { opacity: 0; left: 0; } }

.dg-card, .dg-bubble { display: none; }
.dg.is-live .dg-card, .dg.is-live .dg-bubble { display: block; }
.dg-card {
  position: absolute; top: 0; left: 0; z-index: 3; width: 210px; padding: var(--s-3) var(--s-4);
  background: var(--c-ivory); border: 1px solid var(--c-accent); border-radius: 8px; font-size: 13px; line-height: 1.35;
  box-shadow: 0 16px 30px -18px color-mix(in oklab, var(--c-ink) 70%, transparent);
  opacity: 0; transition: transform 1100ms cubic-bezier(0.65, 0, 0.35, 1), opacity 350ms ease;
}
.dg-card.is-on { opacity: 1; }
.dg-card__k { display: block; font-variant-caps: all-small-caps; letter-spacing: 0.08em; font-weight: 600; color: var(--c-accent); }
.dg-bubble {
  position: absolute; top: 0; left: 0; z-index: 4; max-width: 300px; margin: 0; padding: var(--s-3) var(--s-4);
  background: var(--c-ink); color: var(--c-paper); border-radius: 14px; font-size: 15px; line-height: 1.4;
  opacity: 0; transition: opacity 300ms ease;
}
.dg-bubble[data-who="agent"] { background: var(--c-accent); color: var(--c-accent-ink); }
.dg-bubble.is-on { opacity: 1; animation: bubble-in 420ms cubic-bezier(0.16, 1, 0.3, 1); }
@keyframes bubble-in { from { clip-path: inset(100% 0 0 0 round 14px); } to { clip-path: inset(0 0 0 0 round 14px); } }

.dg-steps { list-style: none; padding: 0; margin: var(--s-6) 0 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--s-4); }
.dg-steps button {
  position: relative; display: block; width: 100%; height: 100%; padding: var(--s-4) 0 var(--s-5); text-align: left; cursor: pointer;
  background: none; border: 0; border-top: 1px solid var(--c-rule); color: var(--c-ink-2); font: inherit; font-size: 16px; line-height: 1.45;
  transition: color 300ms ease;
}
.dg-steps button:hover, .dg-steps button.is-active { color: var(--c-ink); }
.dg-steps button:focus-visible { outline: 2px solid var(--c-focus); outline-offset: 2px; }
.dg-steps__n { display: block; font-family: var(--f-display); font-weight: 600; font-size: 28px; line-height: 1; color: var(--c-accent); margin-bottom: var(--s-2); }
.dg-bar { position: absolute; left: 0; right: 0; top: -1px; height: 2px; background: var(--c-accent); transform: scaleX(0); transform-origin: left; }
.dg:not(.is-live) .dg-bar { display: none; }
.dg.is-paused .dg-bar { animation-play-state: paused !important; }
@keyframes dg-progress { to { transform: scaleX(1); } }
.dg-foot { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-3) var(--s-6); margin-top: var(--s-4); }
.dg-toggle { height: 40px; padding: 0 var(--s-4); border: 1px solid var(--c-ink); background: transparent; color: var(--c-ink); font: inherit; font-size: 15px; line-height: 1; border-radius: 20px; cursor: pointer; }
.dg-toggle:hover { background: var(--c-ink); color: var(--c-paper); }
.dg-toggle:focus-visible { outline: 2px solid var(--c-focus); outline-offset: 2px; }
.dg-note { font-size: 15px; color: var(--c-ink-2); max-width: 60ch; }

@media (max-width: 48rem) {
  .dg-stage { grid-template-columns: minmax(0, 1fr); grid-template-rows: auto 48px auto 48px auto; justify-items: center; padding: var(--s-20) 0 var(--s-8); }
  .dg-wire { width: 2px; height: 100%; }
  .dg-pulse { top: 0; left: -5px; }
  @keyframes pulse-r { 0% { opacity: 0; top: 0; } 15% { opacity: 1; } 85% { opacity: 1; } 100% { opacity: 0; top: calc(100% - 12px); } }
  @keyframes pulse-l { 0% { opacity: 0; top: calc(100% - 12px); } 15% { opacity: 1; } 85% { opacity: 1; } 100% { opacity: 0; top: 0; } }
  .dg-agent, .dg-mem { width: min(100%, 300px); }
  .dg-card { width: 190px; }
  .dg-stage { padding-top: 132px; }
  .dg-bubble { max-width: none; width: calc(100% - 16px); font-size: 14px; }
  .dg-bubble::before { content: "Tú: "; font-weight: 600; }
  .dg-bubble[data-who="agent"]::before { content: "Tu agente: "; }
  .dg-steps { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .mo .timeline[data-timeline]::after { top: 0; bottom: 0; left: -1px; right: auto; width: 1px; height: auto; transform: scaleY(0); transform-origin: top; }
  .mo .timeline[data-timeline].is-in::after { transform: scaleY(1); }
  .mo .timeline[data-timeline] { border-left-color: transparent; }
}

/* ---------- el problema: conversaciones que se pierden ---------- */
.problem { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: var(--s-16); align-items: start; }
.problem .prose { margin-left: clamp(0px, 6vw, 96px); }
.chats { margin: var(--s-4) 0 0; padding: var(--s-6); background: var(--c-paper-2); border-radius: 14px; }
.chats figcaption { font-variant-caps: all-small-caps; letter-spacing: 0.1em; font-size: 15px; color: var(--c-ink-2); margin-bottom: var(--s-4); }
.chats ol { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s-3); }
.chats li { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: var(--s-1) var(--s-3); padding: var(--s-3) var(--s-4); background: var(--c-paper); border: 1px solid var(--c-rule); border-radius: 10px; }
.chats__date { font-size: 14px; color: var(--c-ink-2); font-variant-numeric: lining-nums; }
.chats__state { grid-row: 1; grid-column: 2; font-size: 14px; font-variant-caps: all-small-caps; letter-spacing: 0.1em; color: var(--c-ink-2); }
.chats__txt { grid-column: 1 / -1; font-size: 15px; line-height: 1.4; }
.chats li:not(.chats__new) { background: transparent; border-style: dashed; }
.chats li:not(.chats__new) .chats__txt { text-decoration: line-through; text-decoration-color: color-mix(in oklab, var(--c-ink) 40%, transparent); }
.chats__new { border-color: var(--c-accent); }
.chats__new .chats__state { color: var(--c-accent); font-weight: 600; }
.chats__new .chats__txt { color: var(--c-ink-2); font-style: italic; }
/* Con movimiento: aparecen vivas y se van cerrando una a una. */
.mo [data-chats] li:not(.chats__new) { background: var(--c-paper); border-style: solid; transition: background-color 600ms ease; }
.mo [data-chats] li:not(.chats__new) .chats__txt { text-decoration-color: transparent; transition: text-decoration-color 500ms ease; }
.mo [data-chats] li:not(.chats__new) .chats__state { opacity: 0; transition: opacity 400ms ease; }
.mo [data-chats] .chats__new { opacity: 0; transform: translate3d(0, 12px, 0); transition: opacity 600ms ease, transform 700ms cubic-bezier(0.16, 1, 0.3, 1); }
.mo [data-chats] li.is-closed { background: transparent; border-style: dashed; }
.mo [data-chats] li.is-closed .chats__txt { text-decoration-color: color-mix(in oklab, var(--c-ink) 40%, transparent); }
.mo [data-chats] li.is-closed .chats__state { opacity: 1; }
.mo [data-chats] .chats__new.is-open { opacity: 1; transform: none; }

/* ---------- lo que no es ---------- */
.noes { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: var(--s-16); align-items: start; }
.noes__intro p { margin-top: var(--s-5); max-width: 46ch; }
.versus { margin: 0; }
.versus > div { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--s-8); padding: var(--s-5) 0; border-top: 1px solid var(--c-rule); }
.versus > div:last-child { border-bottom: 1px solid var(--c-rule); }
.versus dt { color: var(--c-ink-2); font-size: 16px; line-height: 1.5; }
.versus dt span { background-image: linear-gradient(var(--c-accent), var(--c-accent)); background-repeat: no-repeat; background-position: 0 58%; background-size: 100% 1.5px; }
.versus dd { margin: 0; font-size: 17px; line-height: 1.5; }
.versus dd::before { content: "Sumario"; display: block; font-variant-caps: all-small-caps; letter-spacing: 0.1em; font-weight: 600; font-size: 14px; color: var(--c-accent); margin-bottom: var(--s-1); }
.versus dt::before { content: "Lo de moda"; display: block; font-variant-caps: all-small-caps; letter-spacing: 0.1em; font-size: 14px; color: var(--c-ink-2); margin-bottom: var(--s-1); }
.mo [data-versus] dt span { background-size: 0 1.5px; transition: background-size 700ms cubic-bezier(0.65, 0, 0.35, 1); }
.mo [data-versus] dd { opacity: 0.001; transform: translate3d(0, 10px, 0); transition: opacity 500ms ease, transform 600ms cubic-bezier(0.16, 1, 0.3, 1); }
.mo [data-versus] > div.is-in dt span { background-size: 100% 1.5px; }
.mo [data-versus] > div.is-in dd { opacity: 1; transform: none; transition-delay: 450ms; }

@media (max-width: 64rem) {
  .problem, .noes { grid-template-columns: minmax(0, 1fr); gap: var(--s-8); }
  .problem .prose { margin-left: 0; }
}
@media (max-width: 48rem) {
  .versus > div { grid-template-columns: minmax(0, 1fr); gap: var(--s-3); }
  .chats { padding: var(--s-4); }
}