/* ============================================================
   PRIMETERRA
   A site set like a book. Type: Libre Caslon Display & Text.
   ============================================================ */

/* ---------- 1. Faces ---------- */
/* Big Caslon Strike — Big Caslon SCap (Carter & Cone, 1994) with the capital
   and lowercase O struck at 45 degrees. Small caps only: each lowercase letter
   is a small capital. Derived copy of a desktop-licensed face — see the note
   in README before this is published. */
@font-face {
  font-family: "Big Caslon Strike";
  src: url("../fonts/BigCaslonStrike-Regular.woff2?v=8b5455ea") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
/* Strike Caslon — Libre Caslon Display (SIL OFL 1.1) with the house lozenge
   marks and the capital O struck through. See tools/strike-caslon.py. */
@font-face {
  font-family: "Strike Caslon";
  src: url("../fonts/StrikeCaslon-Regular.woff2?v=cbf23f2c") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
/* Kept for any glyph the cut may be missing, and as the diagonal-italic source */
@font-face {
  font-family: "Libre Caslon Display";
  src: url("../fonts/LibreCaslonDisplay-normal-400.woff2?v=3b6d3d56") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Libre Caslon Text";
  src: url("../fonts/LibreCaslonText-normal-400.woff2?v=6564df5c") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Libre Caslon Text";
  src: url("../fonts/LibreCaslonText-normal-700.woff2?v=882609d7") format("woff2");
  font-weight: 700; font-style: normal; font-display: swap;
}
/* Italic carries the house lozenge tittle. Keeping it under the same
   family means roman text is untouched — a browser will otherwise match
   an italic face from any family listed before the roman one. */
@font-face {
  font-family: "Libre Caslon Text";
  src: url("../fonts/PrimeterraTextItalic.woff2?v=e3e0cf9e") format("woff2");
  font-weight: 400; font-style: italic; font-display: swap;
}

/* ---------- 2. Tokens ---------- */
:root {
  /* Paper & ink */
  --paper:        #f2ece0;
  --paper-lift:   #f7f2e8;
  --paper-deep:   #e9e1d1;
  --ink:          #191712;
  --ink-2:        #3a352c;
  --ink-3:        #6d6555;
  --ink-4:        #918875;
  --rule:         rgba(25, 23, 18, .16);
  --rule-soft:    rgba(25, 23, 18, .09);

  /* Rubric — the red of a printed rule */
  --rubric:       #a1442a;
  --rubric-soft:  #b9663f;

  /* Night chapter */
  --night:        #222a24;
  --night-2:      #2c352d;
  --night-ink:    #e7e0d2;
  --night-rule:   rgba(231, 224, 210, .18);
  --night-accent: #d98b62;

  /* Type */
  --display: "Big Caslon Strike", "Strike Caslon", "Libre Caslon Display", Georgia, serif;
  --text: "Libre Caslon Text", Georgia, "Times New Roman", serif;

  --fs-display: clamp(3.5rem, 10.5vw, 9.5rem);
  --fs-h1:      clamp(2.35rem, 5.4vw, 4.15rem);
  --fs-h2:      clamp(1.85rem, 3.1vw, 2.9rem);
  --fs-h3:      clamp(1.4rem, 1.85vw, 1.8rem);
  --fs-body:    clamp(1.0625rem, .96rem + .32vw, 1.1875rem);
  --fs-lede:    clamp(1.25rem, 1.05rem + .6vw, 1.6rem);
  --fs-small:   .875rem;
  --fs-micro:   .6875rem;

  --tr-label: .19em;
  --tr-tight: -.018em;

  /* Grid */
  --gutter: clamp(22px, 5.2vw, 92px);
  --gap:    clamp(14px, 1.6vw, 28px);
  --shell:  min(1520px, 100% - var(--gutter) * 2);
  --measure: 34em;

  /* Rhythm */
  --band: clamp(3.6rem, 7vw, 7.2rem);
  --band-sm: clamp(3rem, 5vw, 5rem);

  --ease: cubic-bezier(.22, .61, .24, 1);
}

/* ---------- 3. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul[class], ol[class] { list-style: none; padding: 0; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important; transition-duration: .001ms !important;
  }
}

/* ---------- 4. Page ---------- */
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--text);
  font-size: var(--fs-body);
  line-height: 1.62;
  font-kerning: normal;
  font-variant-ligatures: common-ligatures;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* paper grain */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: 9999;
  pointer-events: none;
  opacity: .5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.055'/%3E%3C/svg%3E");
}

::selection { background: var(--rubric); color: var(--paper-lift); }

.shell {
  width: var(--shell);
  margin-inline: auto;
}

/* ---------- 5. Typography ---------- */
h1, h2, h3, .display {
  font-family: var(--display);
  font-weight: 400;
  letter-spacing: var(--tr-tight);
  line-height: 1.02;
  text-wrap: balance;
}

.h1 { font-size: var(--fs-h1); line-height: 1.02; }
.h2 { font-size: var(--fs-h2); line-height: 1.06; }
.h3 { font-size: var(--fs-h3); line-height: 1.18; letter-spacing: -.01em; }

p { text-wrap: pretty; }

.lede {
  font-family: var(--display);
  font-size: var(--fs-lede);
  line-height: 1.34;
  letter-spacing: -.008em;
  color: var(--ink-2);
  max-width: 30em;
  text-wrap: pretty;
}

.serif-italic { font-style: italic; }

/* tracked uppercase label — the small caps of the book */
.label {
  font-family: var(--text);
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
  line-height: 1.4;
}
.label--rubric { color: var(--rubric); }
.label--ink { color: var(--ink); }
.label--night { color: var(--night-accent); }

.num {
  font-family: var(--display);
  font-feature-settings: "lnum";
  letter-spacing: .02em;
}

/* body copy block */
.prose { max-width: var(--measure); }
.prose > * + * { margin-top: 1.15em; }
.prose h3 { margin-top: 2.4em; }
.prose h3 + * { margin-top: .7em; }
.prose strong { font-weight: 700; }
.prose em { font-style: italic; }
.prose a { color: var(--rubric); text-underline-offset: .18em; text-decoration-thickness: 1px; }

/* drop cap */
.dropcap::first-letter {
  font-family: var(--display);
  float: left;
  font-size: 3.62em;
  line-height: .78;
  padding: .06em .1em 0 0;
  color: var(--ink);
}
.dropcap--rubric::first-letter { color: var(--rubric); }

/* links */
.link {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: .22em;
  text-decoration-color: var(--rule);
  transition: text-decoration-color .35s var(--ease), color .35s var(--ease);
}
.link:hover { color: var(--rubric); text-decoration-color: currentColor; }

/* rule devices */
.rule { height: 1px; background: var(--rule); border: 0; }
.rule--ink { background: var(--ink); opacity: .55; }

/* ---------- 6. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .8em;
  padding: .95em 1.5em .85em;
  border: 1px solid var(--ink);
  font-family: var(--text);
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  background: transparent;
  transition: background .4s var(--ease), color .4s var(--ease), border-color .4s var(--ease);
  white-space: nowrap;
}
.btn:hover { background: var(--ink); color: var(--paper-lift); }
.btn--solid { background: var(--ink); color: var(--paper-lift); }
.btn--solid:hover { background: var(--rubric); border-color: var(--rubric); }
.btn--rubric { border-color: var(--rubric); color: var(--rubric); }
.btn--rubric:hover { background: var(--rubric); border-color: var(--rubric); color: var(--paper-lift); }
.btn--night { border-color: var(--night-rule); color: var(--night-ink); }
.btn--night:hover { background: var(--night-ink); color: var(--night); border-color: var(--night-ink); }

/* text link with an arrow */
.arrow-link {
  display: inline-flex; align-items: baseline; gap: .55em;
  font-size: var(--fs-micro); font-weight: 700; letter-spacing: var(--tr-label);
  text-transform: uppercase; text-decoration: none;
  border-bottom: 1px solid var(--rule);
  padding-bottom: .55em;
  transition: border-color .35s var(--ease), color .35s var(--ease), gap .35s var(--ease);
}
.arrow-link::after { content: "→"; font-weight: 400; letter-spacing: 0; }
.arrow-link:hover { color: var(--rubric); border-color: var(--rubric); gap: .9em; }

/* ---------- 7. Masthead ---------- */
.masthead {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--rule);
  transition: transform .5s var(--ease);
}
.masthead__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 2rem;
  height: clamp(62px, 6.4vw, 84px);
}
.wordmark {
  font-family: var(--display);
  font-size: clamp(1.2rem, 1.6vw, 1.45rem);
  letter-spacing: .01em;
  text-decoration: none;
  line-height: 1;
  display: inline-flex; align-items: baseline; gap: .6em;
}
.wordmark span.mark {
  display: inline-block; width: 5px; height: 5px;
  background: var(--rubric); border-radius: 50%;
  transform: translateY(-.55em);
}
.nav {
  display: flex; align-items: center; gap: clamp(1.1rem, 2.2vw, 2.4rem);
}
.nav a {
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-2);
  position: relative;
  padding-block: .4em;
  transition: color .3s var(--ease);
}
.nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0;
  height: 1px; background: var(--rubric);
  transform: scaleX(0); transform-origin: left;
  transition: transform .45s var(--ease);
}
.nav a:hover { color: var(--ink); }
.nav a:hover::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav a[aria-current="page"] { color: var(--ink); }
.masthead .btn { padding: .72em 1.15em .66em; }

.menu-toggle { display: none; }

/* ---------- 8. Mobile menu ---------- */
.drawer {
  position: fixed; inset: 0; z-index: 200;
  background: var(--paper);
  padding: var(--gutter);
  display: flex; flex-direction: column;
  transform: translateY(-102%);
  visibility: hidden;
  transition: transform .6s var(--ease), visibility 0s linear .6s;
  overflow-y: auto;
}
.drawer[data-open="true"] { transform: translateY(0); visibility: visible; transition: transform .6s var(--ease), visibility 0s; }
.drawer__top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2.5rem; }
.drawer__close { font-size: var(--fs-micro); letter-spacing: var(--tr-label); text-transform: uppercase; font-weight: 700; }
.drawer nav { display: flex; flex-direction: column; }
.drawer nav a {
  font-family: var(--display);
  font-size: clamp(2rem, 9vw, 3rem);
  line-height: 1.16;
  text-decoration: none;
  padding: .3em 0;
  border-bottom: 1px solid var(--rule-soft);
  display: flex; align-items: baseline; gap: .8em;
}
.drawer nav a i {
  font-style: normal; font-family: var(--text);
  font-size: var(--fs-micro); font-weight: 700; letter-spacing: .12em; color: var(--rubric);
}
.drawer__foot { margin-top: auto; padding-top: 2rem; }

/* ---------- 9. Title page (hero) ---------- */
.title-page { padding-block: clamp(2.5rem, 6vw, 5.5rem) var(--band); }
.title-page__grid {
  display: grid;
  grid-template-columns: minmax(0, 7.2fr) minmax(0, 4fr);
  gap: clamp(2rem, 6vw, 7rem);
  align-items: start;
}
.title-page__meta {
  display: flex; justify-content: space-between; gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: clamp(1.6rem, 4vw, 3.2rem);
}
.title-page h1 {
  font-size: var(--fs-display);
  line-height: .867;
  letter-spacing: -.03em;
  margin-left: -.045em;
}
.title-page h1 em {
  font-style: italic;
  display: block;
  font-size: .42em;
  line-height: 1.1;
  letter-spacing: -.012em;
  margin-top: .42em;
  color: var(--ink-2);
}
.title-page__deck {
  margin-top: clamp(1.6rem, 3.2vw, 2.8rem);
  max-width: 26em;
  font-size: clamp(1.06rem, .98rem + .3vw, 1.22rem);
  line-height: 1.55;
  color: var(--ink-2);
}
.title-page__actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.4rem; }

.frontispiece { position: relative; }
.frontispiece figure { margin: 0; }
.frontispiece img { width: 100%; height: auto; }
.frontispiece figcaption {
  margin-top: .9rem;
  padding-top: .7rem;
  border-top: 1px solid var(--rule);
  font-size: var(--fs-small);
  font-style: italic;
  color: var(--ink-3);
  line-height: 1.5;
  max-width: 34ch;
}
.frontispiece figcaption b {
  display: block; font-style: normal; font-weight: 700;
  font-size: var(--fs-micro); letter-spacing: .14em; text-transform: uppercase;
  color: var(--ink-2); margin-bottom: .35em;
}
.title-page__foot {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 2rem; flex-wrap: wrap;
  margin-top: clamp(3rem, 7vw, 6rem);
  padding-top: 1.1rem;
  border-top: 1px solid var(--ink);
}
.title-page__foot p { max-width: 34em; font-size: var(--fs-small); color: var(--ink-3); }

/* ---------- 10. Bands & sections ---------- */
.band { padding-block: var(--band); }
.band--sm { padding-block: var(--band-sm); }
.band--tight { padding-block: clamp(2.5rem, 5vw, 4.5rem); }
.band--deep { background: var(--paper-deep); }
.band--night { background: var(--night); color: var(--night-ink); }
.band--night .label { color: var(--night-accent); }
.band--night .rule { background: var(--night-rule); }
.band--night .lede { color: #cfc8b9; }
.band--night .prose a { color: var(--night-accent); }

/* chapter opener */
.chapter {
  display: grid;
  grid-template-columns: minmax(0, 2.4fr) minmax(0, 6.6fr) minmax(0, 3fr);
  gap: var(--gap);
  align-items: baseline;
  padding-top: 1.2rem;
  border-top: 1px solid var(--ink);
  margin-bottom: clamp(2.2rem, 4.5vw, 4rem);
}
.chapter__no {
  font-family: var(--display); font-size: clamp(1.6rem, 2.4vw, 2.2rem);
  letter-spacing: .06em; color: var(--rubric); line-height: .9;
}
.chapter__title { font-size: var(--fs-h2); }
.chapter__note {
  font-size: var(--fs-small); font-style: italic; color: var(--ink-3);
  max-width: 26ch; justify-self: end; text-align: right; padding-top: .5rem;
}

/* two-column editorial: label left, text right */
.split {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
  gap: clamp(1.5rem, 4vw, 5rem);
}
.split__aside { position: sticky; top: clamp(84px, 8vw, 110px); align-self: start; }
.split__aside .label { display: block; margin-bottom: .8rem; }
.split__aside p { font-size: var(--fs-small); color: var(--ink-3); max-width: 22ch; line-height: 1.55; }

/* ---------- 11. Plates / figures ---------- */
.plate { margin: 0; }
.plate img { width: 100%; height: auto; }
.plate figcaption {
  display: grid; grid-template-columns: auto 1fr; gap: 1.2rem;
  align-items: baseline;
  margin-top: 1rem; padding-top: .8rem;
  border-top: 1px solid var(--rule);
  font-size: var(--fs-small); color: var(--ink-3); line-height: 1.5;
  font-style: italic; max-width: 62ch;
}
.plate figcaption .plate__no {
  font-style: normal; font-size: var(--fs-micro); font-weight: 700;
  letter-spacing: .14em; text-transform: uppercase; color: var(--rubric);
  white-space: nowrap;
}
.plate--full { width: 100%; }
.plate--full img { width: 100%; }

.full-bleed {
  width: 100vw; margin-left: 50%; transform: translateX(-50%);
  position: relative; overflow: hidden;
}
.full-bleed > img { width: 100%; height: auto; }

/* image band with overlaid caption */
.banner { position: relative; overflow: hidden; }
.banner::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 55%;
  background: linear-gradient(to top, rgba(22,19,14,.70) 0%, rgba(22,19,14,.30) 45%, rgba(22,19,14,0) 100%);
  pointer-events: none;
}
.banner > img { width: 100%; height: clamp(320px, 46vw, 600px); object-fit: cover; }
.banner__cap {
  position: absolute; z-index: 1; left: var(--gutter); bottom: clamp(1.4rem, 3vw, 2.6rem);
  color: #f6f1e5; max-width: min(34rem, 62vw);
  font-size: var(--fs-small); font-style: italic; line-height: 1.55;
}
.banner__cap b {
  display: block; font-style: normal; font-weight: 700;
  font-size: var(--fs-micro); letter-spacing: .16em; text-transform: uppercase;
  margin-bottom: .4em;
}

/* hero plate — full-bleed image with a caption set in the margin */
.hero-plate { margin: 0 0 clamp(2.2rem, 4vw, 3.6rem); }
.hero-plate__img img { width: 100%; height: clamp(260px, 36vw, 500px); object-fit: cover; }
.hero-plate__cap {
  display: grid; grid-template-columns: auto minmax(0, 62ch);
  gap: 1.5rem; align-items: baseline;
  padding-top: .9rem; margin-top: .9rem;
  border-top: 1px solid var(--rule);
  font-size: var(--fs-small); font-style: italic; color: var(--ink-3); line-height: 1.5;
}
.hero-plate__cap .plate__no {
  font-style: normal; font-size: var(--fs-micro); font-weight: 700;
  letter-spacing: .14em; text-transform: uppercase; color: var(--rubric); white-space: nowrap;
}
@media (max-width: 620px) {
  .hero-plate__cap { grid-template-columns: 1fr; gap: .4rem; }
}

/* ---------- 12. Figures / metrics ---------- */
.figures {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gap);
  border-top: 1px solid var(--rule);
  padding-top: 1.6rem;
}
.figure__val {
  font-family: var(--display);
  font-size: clamp(2.1rem, 3.6vw, 3.4rem);
  line-height: 1;
  letter-spacing: -.02em;
  display: block;
}
.figure__val sup { font-size: .42em; vertical-align: super; letter-spacing: 0; }
.figure__lab {
  display: block; margin-top: .8rem;
  font-size: var(--fs-micro); font-weight: 700; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ink-3);
}
.figure__note { display: block; margin-top: .35rem; font-size: var(--fs-small); font-style: italic; color: var(--ink-4); }

/* ---------- 13. Contents (TOC) ---------- */
.toc { border-top: 1px solid var(--ink); }
.toc__part {
  display: flex; align-items: baseline; gap: 1.1rem;
  padding: 2.2rem 0 1rem;
  border-bottom: 1px solid var(--rule);
}
.toc__part:first-child { padding-top: 2.2rem; }
.toc__part span:first-child {
  font-family: var(--display); font-size: var(--fs-small); color: var(--rubric);
  letter-spacing: .1em;
}
.toc__part h3 { font-size: var(--fs-h3); letter-spacing: -.01em; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li { border-bottom: 1px solid var(--rule-soft); }
.toc__row {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, auto) minmax(2rem, 1fr) auto 3.4rem;
  align-items: baseline;
  gap: 1rem;
  padding: .95rem 0 .85rem;
  text-decoration: none;
  transition: color .3s var(--ease), padding-left .4s var(--ease);
  position: relative;
}
.toc__no { font-family: var(--text); font-size: var(--fs-micro); font-weight: 700; letter-spacing: .1em; color: var(--ink-4); }
.toc__title { font-family: var(--display); font-size: clamp(1.28rem, 2.1vw, 1.85rem); line-height: 1.1; letter-spacing: -.012em; }
.toc__leader {
  border-bottom: 1px dotted var(--ink-4);
  transform: translateY(-.28em);
  opacity: .55;
}
.toc__meta { font-size: var(--fs-micro); font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); text-align: right; }
.toc__folio { font-size: var(--fs-small); color: var(--ink-4); text-align: right; font-variant-numeric: tabular-nums; }
.toc__row:hover { color: var(--rubric); padding-left: .5rem; }
.toc__row:hover .toc__no, .toc__row:hover .toc__meta, .toc__row:hover .toc__folio { color: var(--rubric); }
.toc__row:hover .toc__leader { border-bottom-color: var(--rubric); opacity: 1; }

/* ---------- 14. Cards (projects index grid) ---------- */
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(1.5rem, 3vw, 3rem); }
.card { text-decoration: none; display: flex; flex-direction: column; }
.card__top { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: .9rem; }
.card__frame { display: block; overflow: hidden; background: var(--paper-deep); aspect-ratio: 3 / 2; }
.card__frame img { width: 100%; height: 100%; object-fit: cover; transition: transform 1.2s var(--ease), filter 1.2s var(--ease); }
.card:hover .card__frame img { transform: scale(1.035); }
.card__title { display: block; font-family: var(--display); font-size: clamp(1.5rem, 2.4vw, 2.1rem); line-height: 1.06; letter-spacing: -.015em; margin-top: 1.1rem; }
.card__deck { display: block; margin-top: .6rem; font-size: var(--fs-small); color: var(--ink-3); line-height: 1.55; max-width: 34ch; }
.card:hover .card__title { color: var(--rubric); }

/* ---------- 15. Quotes ---------- */
.pullquote { padding-block: clamp(2.6rem, 5vw, 4.8rem); }
.pullquote blockquote {
  font-family: var(--display);
  font-size: clamp(1.6rem, 3.6vw, 3rem);
  line-height: 1.16;
  letter-spacing: -.02em;
  max-width: 22em;
  margin: 0;
  text-indent: -.42em;
}
.pullquote blockquote::before { content: "“"; color: var(--rubric); }
.pullquote blockquote::after { content: "”"; color: var(--rubric); }
.pullquote__by {
  margin-top: 1.8rem; padding-top: .9rem; border-top: 1px solid var(--rule);
  font-size: var(--fs-micro); font-weight: 700; letter-spacing: .16em; text-transform: uppercase;
  color: var(--ink-3);
}

/* ---------- 16. Project page ---------- */
.article-head { padding-block: clamp(2.2rem, 5vw, 4rem) clamp(1.8rem, 3.5vw, 3rem); }
.article-head__meta {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  border-bottom: 1px solid var(--rule); padding-bottom: .9rem; margin-bottom: clamp(1.4rem, 3vw, 2.6rem);
}
.crumbs { font-size: var(--fs-micro); font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.crumbs a { text-decoration: none; }
.crumbs a:hover { color: var(--rubric); }
.crumbs span { color: var(--ink-4); margin-inline: .5em; }
.article-head h1 { font-size: clamp(2.6rem, 6.4vw, 5.4rem); line-height: .94; max-width: 16em; }
.article-head .lede { margin-top: clamp(1.2rem, 2.5vw, 2rem); }

.article-body { padding-bottom: var(--band); }
.article-body h2.h3 { margin-bottom: .55em; letter-spacing: -.012em; }
.article-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 8fr) minmax(0, 3.2fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: start;
}
.article-aside {
  position: sticky; top: clamp(90px, 9vw, 120px);
  border-top: 1px solid var(--ink);
  padding-top: .9rem;
}
.article-aside h4 {
  font-size: var(--fs-micro); font-weight: 700; letter-spacing: .16em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: 1rem;
}
.spec { border-top: 1px solid var(--rule-soft); }
.spec > div { display: grid; grid-template-columns: 1fr; gap: .1rem; padding: .8rem 0; border-bottom: 1px solid var(--rule-soft); }
.spec dt { font-size: var(--fs-micro); font-weight: 700; letter-spacing: .13em; text-transform: uppercase; color: var(--ink-4); }
.spec dd { font-size: var(--fs-small); line-height: 1.45; color: var(--ink-2); }

.pagenav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--rule); border-top: 1px solid var(--rule);
  margin-top: var(--band-sm);
}
.pagenav a {
  background: var(--paper); padding: clamp(1.4rem, 3vw, 2.4rem) 1.5rem;
  text-decoration: none; display: block;
  transition: background .4s var(--ease), color .4s var(--ease);
}
.pagenav a:hover { background: var(--paper-deep); color: var(--rubric); }
.pagenav .label { display: block; margin-bottom: .6rem; }
.pagenav .t { font-family: var(--display); font-size: clamp(1.2rem, 2vw, 1.7rem); line-height: 1.1; }
.pagenav a:last-child { text-align: right; }

/* ---------- 17. Residency / CTA ---------- */
.invite {
  display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  gap: clamp(2rem, 5vw, 5rem); align-items: center;
}
.invite__img img { width: 100%; height: auto; max-height: 560px; object-fit: cover; }

/* ---------- 18. Forms ---------- */
.field { display: flex; flex-direction: column; gap: .45rem; }
.field label { font-size: var(--fs-micro); font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.field input, .field textarea, .field select {
  font-family: var(--text); font-size: 1rem; color: var(--ink);
  background: transparent; border: 1px solid var(--rule);
  padding: .85em 1em; border-radius: 0;
  transition: border-color .3s var(--ease);
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none; border-color: var(--ink);
}
.field textarea { min-height: 9rem; resize: vertical; }

.signup { display: flex; gap: 0; max-width: 30rem; }
.signup input {
  flex: 1; font-family: var(--text); font-size: 1rem;
  background: transparent; border: 1px solid var(--ink); border-right: 0;
  padding: .9em 1em; color: var(--ink); border-radius: 0;
}
.signup input:focus { outline: none; background: var(--paper-lift); }
.signup button {
  border: 1px solid var(--ink); background: var(--ink); color: var(--paper-lift);
  padding: 0 1.4em; font-size: var(--fs-micro); font-weight: 700;
  letter-spacing: var(--tr-label); text-transform: uppercase;
  transition: background .35s var(--ease);
}
.signup button:hover { background: var(--rubric); border-color: var(--rubric); }

/* ---------- 19. Footer ---------- */
.footer { border-top: 1px solid var(--ink); padding-top: clamp(2.5rem, 5vw, 4rem); }
.footer__grid {
  display: grid; grid-template-columns: minmax(0, 5fr) repeat(2, minmax(0, 2fr));
  gap: clamp(1.5rem, 4vw, 4rem);
  padding-bottom: clamp(2.5rem, 5vw, 4rem);
}
.footer h3 { font-size: var(--fs-micro); font-weight: 700; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 1.1rem; }
.footer ul { display: flex; flex-direction: column; gap: .55rem; list-style: none; margin: 0; padding: 0; }
.footer a { text-decoration: none; font-size: var(--fs-small); color: var(--ink-2); }
.footer a:hover { color: var(--rubric); }
.footer__addr { font-size: var(--fs-small); color: var(--ink-2); line-height: 1.7; }
.footer__big {
  font-family: var(--display); font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  line-height: 1.08; letter-spacing: -.02em; max-width: 16em; margin-bottom: 1.6rem;
}
.colophon {
  display: flex; justify-content: space-between; gap: 2rem; flex-wrap: wrap;
  border-top: 1px solid var(--rule); padding-block: 1.4rem;
  font-size: var(--fs-micro); letter-spacing: .06em; color: var(--ink-4);
}
.colophon a { color: var(--ink-4); }

/* ---------- 20. Reveal ---------- */
.reveal { opacity: 0; transform: translateY(16px); }
.reveal.is-in {
  opacity: 1; transform: none;
  transition: opacity .95s var(--ease), transform .95s var(--ease);
  transition-delay: var(--d, 0ms);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 21. Utilities ---------- */
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--ink); color: var(--paper); padding: .8rem 1.2rem;
  font-size: var(--fs-micro); letter-spacing: .14em; text-transform: uppercase;
}
.skip:focus { left: 1rem; top: 1rem; }
.mt-1 { margin-top: .6rem; } .mt-2 { margin-top: 1.2rem; } .mt-3 { margin-top: 2rem; } .mt-4 { margin-top: 3rem; }
.text-center { text-align: center; }

/* ---------- 22. Responsive ---------- */
@media (max-width: 1080px) {
  .title-page__grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .frontispiece { max-width: 30rem; }
  .figures { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 2rem; }
  .footer__grid { grid-template-columns: 1fr 1fr; row-gap: 2.5rem; }
  .footer__grid > *:first-child { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .nav, .masthead .btn { display: none; }
  .menu-toggle {
    display: inline-flex; align-items: center; gap: .6em;
    font-size: var(--fs-micro); font-weight: 700; letter-spacing: .16em; text-transform: uppercase;
  }
  .menu-toggle i { display: block; width: 18px; height: 1px; background: currentColor; position: relative; }
  .menu-toggle i::before { content: ""; position: absolute; left: 0; width: 18px; height: 1px; background: currentColor; top: -5px; }
  .chapter { grid-template-columns: 1fr; gap: .8rem; }
  .chapter__note { justify-self: start; text-align: left; }
  .chapter__no { font-size: var(--fs-small); }
  .split { grid-template-columns: 1fr; gap: 1.2rem; }
  .split__aside { position: static; }
  .article-body__grid { grid-template-columns: 1fr; }
  .article-aside { position: static; }
  .invite { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr; }
  .title-page h1 { letter-spacing: -.028em; }
}

@media (max-width: 620px) {
  :root { --measure: 30em; }
  .figure__val { font-size: 2rem; }
  .toc__row { grid-template-columns: 2.2rem minmax(0, 1fr) auto; gap: .6rem; }
  .toc__leader, .toc__meta { display: none; }
  .pagenav { grid-template-columns: 1fr; }
  .pagenav a:last-child { text-align: left; }
  .title-page__foot { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .footer__grid { grid-template-columns: 1fr; }
  .plate figcaption { grid-template-columns: 1fr; gap: .4rem; }
  .article-head h1 { font-size: clamp(2.2rem, 9vw, 3.2rem); }
}

/* ---------- 24. Specimen page ---------- */
.spec-cut { border-top: 1px solid var(--ink); padding-top: 1.2rem; margin-top: clamp(3rem, 6vw, 5rem); }
.spec-cut__head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.spec-cut__name { font-size: var(--fs-h2); }
.spec-cut__params { font-size: var(--fs-micro); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.spec-word { font-size: clamp(3rem, 9vw, 7.5rem); line-height: .9; letter-spacing: -.03em; margin: 1.2rem 0 .6rem; }
.spec-line { font-size: clamp(1.4rem, 3vw, 2.4rem); line-height: 1.1; letter-spacing: -.02em; margin-bottom: 1rem; }
.spec-para { font-size: 1.0625rem; line-height: 1.55; max-width: 34em; color: var(--ink-2); }
.spec-figures { font-size: clamp(1.6rem, 3vw, 2.6rem); letter-spacing: .04em; margin-top: 1rem; }

/* ---------- 25. Struck O ----------
   The strike is drawn over the letter, not cut into the font: a modified
   font file is not permitted by the licence, a drawn rule is. Applied at
   runtime to capital O in display contexts only. */
.strike-o { position: relative; display: inline-block; }
.strike-o::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 138%;
  height: .052em;
  background: currentColor;
  transform: translate(-50%, -50%) rotate(-45deg);
  pointer-events: none;
}