:root {
  --paper: #f2f0e9;
  --ink: #1a1a1a;
  --mute: #5f5c57;
  --faint: #8a877f;
  --rule: rgba(0, 0, 0, 0.12);
  --red: #a81b1b;
  --serif: Georgia, 'Iowan Old Style', 'Times New Roman', serif;
  --mono: ui-monospace, 'SF Mono', Menlo, 'Courier New', monospace;
  --measure: 40rem;
  --wrap: 82rem;
  --gutter: clamp(1rem, 4vw, 3rem);
  --side: 13rem;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--serif); font-size: 18px; line-height: 1.65;
  min-height: 100vh; display: flex; flex-direction: column;
}
a { color: inherit; text-underline-offset: 3px; text-decoration-thickness: 0.5px; }
a:hover { color: var(--red); }
img { max-width: 100%; }
figure { margin: 0; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }

/* header / footer */
.top { border-bottom: 0.5px solid var(--rule); }
.top .wrap { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 0.75rem 1.5rem; padding-top: 1.4rem; padding-bottom: 1.4rem; }
.top .brand { display: flex; align-items: baseline; flex-wrap: wrap; gap: 0.2rem 0.9rem; text-decoration: none; }
.top .name { font-size: 1.05rem; letter-spacing: 0.02em; }
.top .tagline { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.04em; color: var(--mute); }
.top .brand:hover .name { color: var(--red); }
@media (max-width: 640px) { .top .brand { flex-direction: column; } }
.top nav { display: flex; gap: 1.3rem; flex-wrap: wrap; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; }
.top nav a { color: var(--mute); text-decoration: none; }
.top nav a[aria-current='page'] { color: var(--ink); border-bottom: 1px solid var(--ink); }
main { flex: 1; }
.foot { border-top: 0.5px solid var(--rule); margin-top: 4rem; }
.foot .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; padding-top: 1.2rem; padding-bottom: 1.2rem; font-family: var(--mono); font-size: 0.7rem; color: var(--faint); letter-spacing: 0.04em; }
.foot a { color: var(--faint); text-decoration: none; }

/* shared type */
.label, .side h2 {
  font-family: var(--mono); font-weight: 400; font-size: 0.72rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--mute); margin: 0;
}
.caption { font-family: var(--mono); font-size: 0.68rem; color: var(--faint); letter-spacing: 0.04em; margin-top: 0.6rem; line-height: 1.5; }
.caption-title { display: block; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink); margin-bottom: 0.3rem; }
.more { font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.04em; margin-top: 1.6rem; }
.more a { text-decoration: none; }
.back { font-family: var(--mono); font-size: 0.72rem; color: var(--mute); text-decoration: none; letter-spacing: 0.04em; }
.prose p, .prose li { margin: 0 0 1rem; }
.prose ul, .prose ol { padding-left: 1.2rem; margin: 0 0 1rem; }
.prose h2 { font-family: var(--serif); font-weight: 400; font-size: 1.35rem; line-height: 1.3; color: var(--ink); margin: 2.6rem 0 0.7rem; }
.prose h2:first-child { margin-top: 0; }
.prose strong { font-weight: 600; }
.prose blockquote { margin: 1.4rem 0; padding: 0 0 0 1.2rem; border-left: 1px solid var(--red); color: var(--ink); }
.prose blockquote p { margin-bottom: 0.4rem; }

/* page head */
.pagehead { display: grid; grid-template-columns: var(--side) minmax(0, 1fr); gap: 3rem; margin: 3.5rem 0 3rem; align-items: baseline; }
.pagehead h1 { font-weight: 400; font-size: 1.7rem; margin: 0; line-height: 1.2; }
.pagehead p { margin: 0; color: var(--mute); max-width: var(--measure); }

/* section grid: label column + content */
.sect { display: grid; grid-template-columns: var(--side) minmax(0, 1fr); gap: 0.6rem 3rem; padding: 2.2rem 0; border-top: 0.5px solid var(--rule); }
.sect > h2 { font-family: var(--serif); font-weight: 400; font-size: 1.3rem; line-height: 1.3; color: var(--ink); margin: 0; }
.sect > div { max-width: var(--measure); }
.sect > .full { grid-column: 1 / -1; max-width: none; margin-top: 1.4rem; }
.sect p:last-child, .sect ul:last-child { margin-bottom: 0; }

@media (max-width: 860px) {
  .pagehead, .sect { grid-template-columns: minmax(0, 1fr); gap: 0.8rem; }
  .pagehead { margin: 2.5rem 0 2rem; }
}

/* diagrams */
.dg { display: block; width: 100%; height: auto; }
.dg-k { font-family: var(--mono); font-size: 19px; letter-spacing: 0.12em; fill: var(--ink); }
.dg-d { font-family: var(--serif); font-size: 23px; fill: #4a4844; }
.dg-l { fill: none; stroke: var(--ink); stroke-width: 1.4; }
.dg-li { fill: none; stroke: var(--paper); stroke-width: 1.6; }
.dg-p { fill: none; stroke: var(--paper); stroke-width: 2; }
.diagram { margin: 0; }
.diagram figcaption { max-width: var(--measure); margin: 1rem 0 0 calc(var(--side) + 3rem); font-size: 0.92rem; color: var(--mute); line-height: 1.55; }
@media (max-width: 860px) {
  .diagram figcaption { margin-left: 0; }
  .dg-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 0 calc(-1 * var(--gutter)); padding: 0 var(--gutter); }
  .dg-scroll .dg { width: 1100px; max-width: none; }
  .diagram .dg-hint { display: block; }
}
.dg-hint { display: none; font-family: var(--mono); font-size: 0.66rem; color: var(--faint); margin-top: 0.4rem; }

/* home */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 2rem 3.5rem; align-items: center; margin: clamp(1.5rem, 4vw, 3rem) 0 3.5rem; }
.hero-img { order: 2; }
.hero-img img { display: block; width: 100%; height: auto; background: #050504; }
.hero-text { order: 1; }
.lead { font-size: clamp(1.6rem, 2.9vw, 2.35rem); line-height: 1.22; margin: 0 0 1.4rem; font-weight: 400; }
.intro p { margin: 0 0 0.9rem; }
@media (max-width: 860px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 1.4rem; margin-top: 0; }
  .hero-img { order: 0; margin: 0 calc(-1 * var(--gutter)); }
  .hero-img img { aspect-ratio: 4 / 3; object-fit: cover; }
  .hero-img .caption { padding: 0 var(--gutter); }
  .hero-text { order: 1; }
}
.block { margin: 0 0 5rem; }
.block > .label { padding-top: 1.2rem; border-top: 0.5px solid var(--rule); margin-bottom: 1.4rem; }
.diptych { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.55fr); gap: 1.5rem; align-items: start; }
@media (max-width: 860px) { .diptych { grid-template-columns: minmax(0, 1fr); } }
.diptych img { display: block; width: 100%; height: auto; background: #050504; }
.diptych figcaption { font-size: 0.92rem; line-height: 1.55; color: var(--mute); margin-top: 0.8rem; max-width: 34rem; }
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem; }
@media (max-width: 860px) { .cards { grid-template-columns: minmax(0, 1fr); } }
.card { text-decoration: none; display: block; }
.card img { display: block; width: 100%; height: auto; aspect-ratio: 3 / 2; object-fit: cover; background: #050504; }
.card-meta { font-family: var(--mono); font-size: 0.66rem; color: var(--faint); letter-spacing: 0.04em; margin-top: 0.8rem; }
.card-title { font-size: 1.2rem; margin-top: 0.2rem; }
.card p { font-size: 0.95rem; line-height: 1.55; color: var(--mute); margin: 0.4rem 0 0; }
.card:hover .card-title { color: var(--red); }
.tag { display: inline-block; font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink); border: 0.5px solid var(--ink); padding: 0.1rem 0.4rem; margin-top: 0.6rem; }
.tag.ai { color: var(--red); border-color: var(--red); }
.essays-home { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem 3rem; }
@media (max-width: 860px) { .essays-home { grid-template-columns: minmax(0, 1fr); } }

/* register (work index) */
.register { list-style: none; padding: 0; margin: 0 0 4rem; border-top: 0.5px solid var(--rule); }
.register li { border-bottom: 0.5px solid var(--rule); }
.register a { display: grid; grid-template-columns: 180px minmax(0, 1fr) 15rem; gap: 2rem; align-items: center; padding: 1.2rem 0; text-decoration: none; }
.register img { width: 180px; height: 120px; object-fit: cover; display: block; background: #050504; }
.register .t { font-size: 1.2rem; }
.register a:hover .t { color: var(--red); }
.register .m { font-family: var(--mono); font-size: 0.7rem; color: var(--faint); letter-spacing: 0.03em; margin-top: 0.15rem; }
.register .d { font-size: 0.95rem; color: var(--mute); line-height: 1.5; margin-top: 0.4rem; max-width: 40rem; }
.register .s { font-family: var(--mono); font-size: 0.68rem; color: var(--mute); line-height: 1.5; }
@media (max-width: 860px) {
  .register a { grid-template-columns: 96px minmax(0, 1fr); gap: 1rem; }
  .register img { width: 96px; height: 64px; }
  .register .s { grid-column: 2; }
}

/* case page */
.case-head { margin: 3rem 0 2rem; }
.case-head .id { font-family: var(--mono); font-size: 0.72rem; color: var(--faint); letter-spacing: 0.1em; margin-top: 1.4rem; }
.case-head h1 { font-weight: 400; font-size: clamp(1.8rem, 4vw, 2.6rem); margin: 0.2rem 0 0.4rem; line-height: 1.15; }
.case-head p { margin: 0; color: var(--mute); max-width: var(--measure); }
.pair { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: 1.5rem; align-items: start; }
@media (max-width: 860px) { .pair { grid-template-columns: minmax(0, 1fr); } }
.pair img { display: block; width: 100%; height: auto; background: #050504; }
.case-grid { display: grid; grid-template-columns: var(--side) minmax(0, var(--measure)) minmax(0, 1fr); gap: 3rem; align-items: start; margin: 3rem 0 2rem; }
.case-grid .prose { grid-column: 2; }
.case-grid aside { grid-column: 1; grid-row: 1; position: sticky; top: 1.5rem; }
@media (max-width: 1100px) { .case-grid { grid-template-columns: var(--side) minmax(0, 1fr); } }
@media (max-width: 860px) {
  .case-grid { grid-template-columns: minmax(0, 1fr); }
  .case-grid .prose, .case-grid aside { grid-column: 1; grid-row: auto; position: static; }
}
.facts { font-family: var(--mono); font-size: 0.7rem; line-height: 1.5; margin: 0; }
.facts dt { color: var(--faint); letter-spacing: 0.06em; text-transform: uppercase; font-size: 0.62rem; margin-top: 0.9rem; }
.facts dt:first-child { margin-top: 0; }
.facts dd { margin: 0.15rem 0 0; color: var(--ink); }
.note { font-family: var(--mono); font-size: 0.66rem; color: var(--faint); margin-top: 1.5rem; line-height: 1.5; }

/* essays */
.elist { list-style: none; padding: 0; margin: 0; border-top: 0.5px solid var(--rule); }
.elist li { border-bottom: 0.5px solid var(--rule); }
.elist a { display: grid; grid-template-columns: var(--side) minmax(0, var(--measure)); gap: 0.5rem 3rem; padding: 1.6rem 0; text-decoration: none; }
.elist .when { font-family: var(--mono); font-size: 0.7rem; color: var(--faint); letter-spacing: 0.04em; padding-top: 0.35rem; }
.elist .t { font-size: 1.3rem; line-height: 1.3; }
.elist a:hover .t { color: var(--red); }
.elist .ab { color: var(--mute); font-size: 0.97rem; line-height: 1.55; margin-top: 0.5rem; }
.draft { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--red); }
@media (max-width: 860px) { .elist a { grid-template-columns: minmax(0, 1fr); } }
.essay-head { display: grid; grid-template-columns: var(--side) minmax(0, var(--measure)); gap: 0 3rem; margin: 3rem 0 2.5rem; }
.essay-head > div { grid-column: 2; }
.essay-head h1 { font-weight: 400; font-size: clamp(1.7rem, 3.6vw, 2.4rem); line-height: 1.2; margin: 1.2rem 0 0.8rem; }
.essay-head .dek { color: var(--mute); font-size: 1.05rem; margin: 0; }
.essay-grid { display: grid; grid-template-columns: var(--side) minmax(0, var(--measure)); gap: 3rem; align-items: start; }
.essay-grid aside { position: sticky; top: 1.5rem; }
.essay .prose h2 { font-family: var(--serif); text-transform: none; letter-spacing: 0; font-size: 1.15rem; color: var(--ink); margin: 2.4rem 0 0.8rem; }
.essay .refs { font-size: 0.85rem; line-height: 1.5; color: var(--mute); }
.essay .refs li { margin-bottom: 0.6rem; }
.essay sup { font-family: var(--mono); font-size: 0.65rem; }
.essay .prose ol.fn, .essay .prose .footnotes { font-size: 0.85rem; color: var(--mute); }
@media (max-width: 860px) {
  .essay-head, .essay-grid { grid-template-columns: minmax(0, 1fr); }
  .essay-head > div { grid-column: 1; }
  .essay-grid aside { position: static; }
}

/* numbered keys */
.key-svg { display: block; width: 100%; height: auto; overflow: visible; }
.key-lo { stroke: var(--ink); fill: none; }
.key-l { stroke: var(--paper); fill: none; }
.key-t { fill: none; stroke: var(--paper); }
.key-m { fill: var(--paper); stroke: var(--ink); stroke-width: 2; }
.key-n { font-family: var(--mono); fill: var(--ink); }
.key-list { list-style: none; padding: 0; margin: 1.2rem 0 0; display: grid; gap: 0.7rem; font-size: 0.95rem; line-height: 1.5; }
.key-list li { display: grid; grid-template-columns: 1.6rem minmax(0, 1fr); gap: 0.6rem; align-items: baseline; margin: 0; }
.key-list strong { font-weight: 600; }
.key-badge { display: inline-flex; width: 1.45rem; height: 1.45rem; border: 1px solid var(--ink); border-radius: 50%; align-items: center; justify-content: center; font-family: var(--mono); font-size: 0.7rem; }
.key-list.short { font-size: 0.92rem; color: var(--mute); }
.key-list.short strong { color: var(--ink); }
.howto { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: 2.5rem; align-items: start; }
@media (max-width: 860px) { .howto { grid-template-columns: minmax(0, 1fr); } }

/* method: diagram-first sections */
.dsect { padding: 2.2rem 0 3rem; border-top: 0.5px solid var(--rule); }
.dsect > .label { margin-bottom: 1.6rem; }
.dsect-text { max-width: var(--measure); margin: 2rem 0 0 calc(var(--side) + 3rem); }
.only-mob { display: none; }
@media (max-width: 860px) {
  .only-desk { display: none; }
  .only-mob { display: block; }
  .dsect-text { margin-left: 0; }
}

/* headings v2 */
.kicker { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--red); margin: 0 0 0.5rem; }
.sh { font-family: var(--serif); font-weight: 400; font-size: clamp(1.5rem, 2.8vw, 2.1rem); line-height: 1.2; margin: 0 0 1.6rem; max-width: 30em; }
.sub { font-family: var(--serif); font-weight: 400; font-size: 1.12rem; margin: 0 0 1rem; color: var(--ink); }
.block { padding-top: 2.4rem; border-top: 0.5px solid var(--rule); }
.dsect > .kicker { margin-top: 0.4rem; }
.jump { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 2rem; }
.jump a { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.04em; text-decoration: none; border: 0.5px solid var(--ink); padding: 0.45rem 0.8rem; }
.jump a:hover { background: var(--ink); color: var(--paper); }
.case-intro { display: grid; grid-template-columns: minmax(0, var(--measure)) minmax(0, 18rem); gap: 1rem 4rem; margin-bottom: 2.4rem; align-items: start; }
.case-intro .prose p:last-child { margin-bottom: 0; }
@media (max-width: 860px) { .case-intro { grid-template-columns: minmax(0, 1fr); } }
.facts.big { font-size: 0.8rem; border-top: 1px solid var(--ink); padding-top: 0.9rem; }
.facts.big dd { font-family: var(--serif); font-size: 1rem; line-height: 1.4; }
.pupils { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.5rem; }
.pupils img { display: block; width: 100%; height: auto; background: #050504; }
.pupils figcaption { font-size: 0.9rem; line-height: 1.5; color: var(--mute); margin-top: 0.6rem; }
.pupils strong { color: var(--ink); font-weight: 600; }
@media (max-width: 640px) { .pupils { grid-template-columns: minmax(0, 1fr); gap: 1.2rem; } }
.dsect-wide { margin: 2.6rem 0 0; }
.case-summary { color: var(--ink) !important; font-size: 1.1rem; margin-top: 0.8rem !important; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; border-top: 0.5px solid var(--rule); padding-top: 1.4rem; margin-bottom: 1rem; }
.pager a { text-decoration: none; font-size: 1.15rem; }
.pager a span { display: block; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.06em; color: var(--mute); text-transform: uppercase; margin-bottom: 0.2rem; }
.pager .nx { text-align: right; }
.foot-links { display: flex; gap: 1.2rem; flex-wrap: wrap; }