/* ============================================================
   RSI LAB — an AMADEUS AI lab
   Long-form manifesto / thesis. Built on the Amadeus system:
   cold governs (midnight), warm signs (copper), three voices,
   dark → light → dark. Adds reading machinery: sticky TOC,
   collapsible chapters, inline plain-language jargon, citation
   tooltips, card-tables, works-cited appendix.
   ============================================================ */

:root {
  --midnight: #272757;
  --midnight-2: #2f2f66;
  --midnight-3: #353574;
  --copper: #F38846;
  --copper-dark: #CE4F01;

  --paper: #f2f3f7;
  --white: #ffffff;
  --warm-white: #f4f2ec;
  --ink-dark: #f4f2ec;
  --ink-light: #272757;
  --muted-dark: #a6a4c6;
  --muted-light: #65657f;

  --rule-dark: rgba(244, 242, 236, 0.16);
  --rule-light: rgba(39, 39, 87, 0.14);

  --serif: "Literata", Georgia, "Times New Roman", serif;
  --sans: "Fustat", "Segoe UI", system-ui, sans-serif;
  --mono: "Inconsolata", ui-monospace, "SF Mono", Menlo, monospace;

  --maxw: 1200px;
  --readw: 68ch;
  --gutter: clamp(22px, 5.5vw, 84px);

  --toc-w: 250px;
}

.theme-dark {
  --bg: var(--midnight);
  --surface: var(--midnight-2);
  --surface-2: var(--midnight-3);
  --ink: var(--ink-dark);
  --muted: var(--muted-dark);
  --rule: var(--rule-dark);
  --accent: var(--copper);
  color: var(--ink);
  background: var(--bg);
}
.theme-light {
  --bg: var(--paper);
  --surface: var(--white);
  --surface-2: #e9eaf1;
  --ink: var(--ink-light);
  --muted: var(--muted-light);
  --rule: var(--rule-light);
  --accent: var(--copper-dark);
  color: var(--ink);
  background: var(--bg);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; font-size: 17px; scroll-padding-top: 92px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--midnight);
  color: var(--ink-dark);
  font-size: 1.05rem;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-synthesis: none;
}
img, svg { display: block; }
a { color: inherit; text-decoration: none; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding-inline: var(--gutter); }

/* ---------- mesh registers (equilateral triangles) ---------- */
.reg { position: relative; }
.reg--dark::before, .reg--light::before {
  content: "";
  position: absolute; inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.06;
  background-image: var(--mesh-img);
}
.reg--dark {
  --mesh-img: url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='60'%20height='103.923'%20viewBox='0%200%2060%20103.923'%3E%3Cpath%20fill='none'%20stroke='%239a99c4'%20stroke-width='1'%20d='M0,0H60M0,51.96H60M0,103.92H60M0,0L60,103.92M30,0L60,51.96M0,51.96L30,103.92M60,0L0,103.92M30,0L0,51.96M60,51.96L30,103.92'/%3E%3C/svg%3E");
}
.reg--light {
  --mesh-img: url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='60'%20height='103.923'%20viewBox='0%200%2060%20103.923'%3E%3Cpath%20fill='none'%20stroke='%23272757'%20stroke-width='1'%20d='M0,0H60M0,51.96H60M0,103.92H60M0,0L60,103.92M30,0L60,51.96M0,51.96L30,103.92M60,0L0,103.92M30,0L0,51.96M60,51.96L30,103.92'/%3E%3C/svg%3E");
}

/* ---------- type primitives ---------- */
.display {
  font-family: var(--serif);
  font-weight: 380;
  font-size: clamp(2.4rem, 5vw, 4.3rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  text-wrap: balance;
  margin: 0;
}
.h-section {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.018em;
  text-wrap: balance;
  margin: 0;
}
.display em, .h-section em, .statement em, .reinforce em, .h-sub em { font-style: italic; color: var(--accent); }
.lede {
  font-size: clamp(1.06rem, 1.4vw, 1.28rem);
  line-height: 1.55;
  color: var(--muted);
  max-width: 58ch;
  text-wrap: pretty;
}
.body {
  color: var(--ink);
  max-width: var(--readw);
  text-wrap: pretty;
  margin: 0;
  font-size: 1.06rem;
  line-height: 1.66;
}
.body + .body { margin-top: 1.15em; }
.body strong { font-weight: 600; }
.muted { color: var(--muted); }
.eyebrow {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.7em;
}
.eyebrow::before { content: ""; width: 26px; height: 1px; background: var(--accent); opacity: 0.8; }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 20px var(--gutter);
  transition: background 0.45s ease, color 0.45s ease, border-color 0.45s ease, padding 0.3s ease;
  border-bottom: 1px solid transparent;
  color: var(--warm-white);
}
.nav.is-stuck {
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--rule-light);
  color: var(--ink-light);
  padding-block: 13px;
}
.brandblock { display: flex; align-items: baseline; gap: 12px; min-width: 0; }
.wordmark {
  font-family: var(--serif);
  font-weight: 440;
  font-size: 1.24rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.wordmark .lab { color: var(--copper); }
.nav.is-stuck .wordmark .lab { color: var(--copper-dark); }
.brand-sep {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted-dark);
  white-space: nowrap;
}
.nav.is-stuck .brand-sep { color: var(--muted-light); }
.nav-tools { display: flex; align-items: center; gap: 14px; }

/* plain-language toggle in nav */
.pl-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: inherit;
  opacity: 0.85;
  cursor: pointer;
  user-select: none;
}
.pl-toggle:hover { opacity: 1; }
.pl-switch {
  position: relative; width: 34px; height: 18px; flex: 0 0 auto;
  border: 1px solid currentColor; border-radius: 0;
  opacity: 0.6; transition: opacity 0.25s ease, border-color 0.25s ease;
}
.pl-switch::after {
  content: ""; position: absolute; top: 2px; left: 2px;
  width: 12px; height: 12px; background: currentColor;
  transition: transform 0.25s cubic-bezier(0.22,1,0.36,1), background 0.25s ease;
}
.pl-toggle[aria-pressed="true"] .pl-switch { opacity: 1; border-color: var(--copper); }
.pl-toggle[aria-pressed="true"] .pl-switch::after { transform: translateX(16px); background: var(--copper); }
.nav.is-stuck .pl-toggle[aria-pressed="true"] .pl-switch { border-color: var(--copper-dark); }
.nav.is-stuck .pl-toggle[aria-pressed="true"] .pl-switch::after { background: var(--copper-dark); }

.nav-cta {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border: 1px solid currentColor;
  padding: 9px 17px;
  opacity: 0.92;
  white-space: nowrap;
  transition: color 0.25s ease, border-color 0.25s ease, opacity 0.25s;
}
.nav-cta:hover { color: var(--copper); border-color: var(--copper); opacity: 1; }
.nav.is-stuck .nav-cta:hover { color: var(--copper-dark); border-color: var(--copper-dark); }

/* back-to-main button */
.nav-main {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border: 1px solid currentColor;
  padding: 9px 16px;
  opacity: 0.92;
  white-space: nowrap;
  transition: color 0.25s ease, border-color 0.25s ease, opacity 0.25s;
}
.nav-main .nav-main-icon { display: block; transition: transform 0.25s ease; }
.nav-main:hover { color: var(--copper); border-color: var(--copper); opacity: 1; }
.nav-main:hover .nav-main-icon { transform: translateX(-3px); }
.nav.is-stuck .nav-main:hover { color: var(--copper-dark); border-color: var(--copper-dark); }

/* centred up-arrow — appears once the nav turns light */
.nav-up {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, calc(-50% - 8px));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--rule-light);
  border-radius: 50%;
  color: var(--ink-light);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease, transform 0.5s cubic-bezier(0.22,1,0.36,1), color 0.25s ease, border-color 0.25s ease;
}
.nav.is-stuck .nav-up {
  opacity: 0.9;
  pointer-events: auto;
  transform: translate(-50%, -50%);
}
.nav-up:hover { color: var(--copper-dark); border-color: var(--copper-dark); opacity: 1; }
.nav-up:hover svg { transform: translateY(-2px); }
.nav-up svg { transition: transform 0.25s ease; }

/* buttons */
.btn-primary {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--midnight);
  background: var(--copper);
  padding: 15px 26px;
  border: 1px solid var(--copper);
  transition: background 0.25s ease, transform 0.25s ease;
  cursor: pointer;
}
.btn-primary:hover { background: #d6985e; transform: translateY(-1px); }
.btn-outline {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--warm-white);
  padding: 15px 24px;
  border: 1px solid var(--rule-dark);
  transition: border-color 0.25s ease, color 0.25s ease;
  cursor: pointer;
}
.btn-outline:hover { border-color: var(--copper); color: var(--copper); }

/* ============================================================
   HERO (dark)
   ============================================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: center;
  overflow: hidden;
  padding: 132px 0 84px;
  background:
    radial-gradient(120% 90% at 80% 16%, rgba(243,136,70,0.10), transparent 56%),
    radial-gradient(125% 95% at 16% 10%, var(--midnight-2) 0%, var(--midnight) 62%);
}
.hero.reg--dark::before { display: none; } /* static triangle mesh removed in hero — replaced by animated tessellation */
.hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; pointer-events: none; }
.hero-inner { position: relative; z-index: 1; max-width: var(--maxw); width: 100%; margin: 0 auto; padding-inline: var(--gutter); }
.hero-eyebrow {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--copper);
  display: flex; align-items: center; gap: 0.85em;
  margin-bottom: 30px;
}
.hero-eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--copper); opacity: 0.8; }
.hero-eyebrow .by { color: var(--muted-dark); }
.hero-h { font-size: clamp(2.5rem, 5.6vw, 4.9rem); max-width: 19ch; line-height: 1.16; }
.hero-sub {
  margin-top: 30px;
  font-size: clamp(1.05rem, 1.5vw, 1.3rem);
  line-height: 1.55;
  color: var(--paper);
  max-width: 56ch;
  text-wrap: pretty;
}
.hero-cta { margin-top: 42px; display: flex; gap: 18px; flex-wrap: wrap; align-items: center; }
.hero-thesis {
  margin-top: 54px;
  padding-top: 28px;
  border-top: 1px solid var(--rule-dark);
  display: grid;
  grid-template-columns: minmax(0,1fr) auto;
  gap: clamp(18px, 4vw, 60px);
  align-items: end;
  max-width: 940px;
}
.hero-thesis-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--copper);
  margin: 0 0 12px;
}
.hero-thesis-title {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.05rem, 1.5vw, 1.32rem);
  line-height: 1.4;
  color: var(--warm-white);
  margin: 0;
  max-width: 58ch;
  text-wrap: pretty;
}
.hero-trace { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.06em; color: var(--muted-dark); white-space: nowrap; align-self: end; }
@media (max-width: 720px) { .hero-thesis { grid-template-columns: 1fr; } .hero-trace { white-space: normal; } }

/* ============================================================
   DOCUMENT (light) — slides up over hero with rounded shoulder
   ============================================================ */
.doc {
  position: relative;
  z-index: 2;
  background: var(--white);
  border-radius: 30px 30px 0 0;
  box-shadow: 0 -34px 80px -30px rgba(12, 12, 36, 0.6);
  margin-top: -34px;
}

/* masthead band */
.masthead { padding: clamp(64px, 9vh, 120px) 0 clamp(40px, 6vh, 72px); border-bottom: 1px solid var(--rule-light); position: relative; z-index: 1; }
.masthead-eyebrow { margin-bottom: 26px; }
.masthead-title {
  font-family: var(--serif);
  font-weight: 380;
  font-size: clamp(1.9rem, 3.4vw, 2.9rem);
  line-height: 1.16;
  letter-spacing: -0.018em;
  color: var(--ink-light);
  margin: 0;
  max-width: 26ch;
  text-wrap: balance;
}
.masthead-abstract { margin-top: clamp(26px, 4vh, 40px); max-width: var(--readw); }
.masthead-meta {
  margin-top: clamp(30px, 4vh, 44px);
  display: flex; flex-wrap: wrap; gap: 14px 30px; align-items: center;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--muted-light);
}
.masthead-meta .dot { width: 5px; height: 5px; background: var(--copper-dark); border-radius: 50%; display: inline-block; }
.masthead-meta b { color: var(--ink-light); font-weight: 600; }

/* report byline */
.masthead-byline {
  margin-top: clamp(28px, 3.6vh, 40px);
  padding-top: clamp(18px, 2.4vh, 24px);
  border-top: 1px solid var(--rule-light);
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 22px;
}
.byline-label {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--copper-dark);
}
.byline-names {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 12px;
  font-family: var(--serif);
  font-size: clamp(1.04rem, 1.4vw, 1.22rem);
  line-height: 1.25;
  letter-spacing: -0.005em;
  color: var(--ink-light);
}
.byline-sep { color: var(--copper-dark); }
.byline-affil {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-light);
  align-self: center;
}
@media (max-width: 560px) {
  .byline-affil { margin-left: 0; flex-basis: 100%; }
}

/* the plain-language hint callout in masthead */
.pl-hint {
  margin-top: 30px;
  display: flex; align-items: center; gap: 14px;
  padding: 16px 20px;
  border: 1px solid var(--rule-light);
  background: var(--paper);
  max-width: 620px;
}
.pl-hint-ico { flex: 0 0 auto; width: 26px; height: 26px; color: var(--copper-dark); }
.pl-hint p { margin: 0; font-size: 0.94rem; color: var(--muted-light); line-height: 1.5; }
.pl-hint b { color: var(--ink-light); font-weight: 600; }
.pl-hint button {
  margin-left: auto; flex: 0 0 auto;
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.14em; text-transform: uppercase;
  font-weight: 700; color: var(--copper-dark); background: transparent;
  border: 1px solid var(--copper-dark); padding: 8px 13px; cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}
.pl-hint button:hover { background: var(--copper-dark); color: var(--white); }
@media (max-width: 560px) { .pl-hint { flex-wrap: wrap; } .pl-hint button { margin-left: 0; } }

/* ============================================================
   READING LAYOUT — sticky TOC + main column
   ============================================================ */
.reading {
  display: grid;
  grid-template-columns: var(--toc-w) minmax(0, 1fr);
  gap: clamp(34px, 5vw, 88px);
  padding-block: clamp(48px, 7vh, 92px);
  position: relative;
  z-index: 1;
}
@media (max-width: 940px) { .reading { grid-template-columns: 1fr; gap: 0; } }

/* ---- sticky TOC ---- */
.toc { position: sticky; top: 96px; align-self: start; max-height: calc(100vh - 120px); overflow-y: auto; scrollbar-width: thin; }
.toc-label { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--muted-light); margin: 0 0 18px; display: flex; align-items: center; gap: 0.7em; }
.toc-label::before { content: ""; width: 20px; height: 1px; background: var(--copper-dark); }
.toc-list { list-style: none; margin: 0; padding: 0; }
.toc-item { margin: 0; }
.toc-link {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 11px;
  align-items: baseline;
  padding: 9px 0;
  border-top: 1px solid var(--rule-light);
  color: var(--muted-light);
  transition: color 0.22s ease;
  cursor: pointer;
}
.toc-item:last-child .toc-link { border-bottom: 1px solid var(--rule-light); }
.toc-num { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; color: var(--muted-light); transition: color 0.22s ease; }
.toc-text { font-size: 0.9rem; line-height: 1.32; text-wrap: pretty; }
.toc-link:hover { color: var(--ink-light); }
.toc-link:hover .toc-num { color: var(--copper-dark); }
.toc-link.is-active { color: var(--ink-light); }
.toc-link.is-active .toc-num { color: var(--copper-dark); font-weight: 700; }
.toc-link.is-active .toc-text { font-weight: 600; }
.toc-link.is-soon { cursor: default; opacity: 0.5; }
.toc-link.is-soon:hover { color: var(--muted-light); }
.toc-soon-tag { font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted-light); border: 1px solid var(--rule-light); padding: 1px 6px; margin-left: 8px; }
.toc-progress { margin-top: 20px; height: 2px; background: var(--rule-light); position: relative; }
.toc-progress i { position: absolute; inset: 0 auto 0 0; width: 0; background: var(--copper-dark); transition: width 0.15s linear; }
@media (max-width: 940px) {
  .toc { display: none; }
}

/* ---- main reading column ---- */
.chapters { min-width: 0; }

/* ============================================================
   CHAPTER — collapsible, intro visible
   ============================================================ */
.chapter { padding-block: clamp(40px, 6vh, 72px); border-top: 1px solid var(--rule-light); }
.chapter:first-child { border-top: none; padding-top: 0; }
.chapter-head { display: flex; gap: clamp(18px, 3vw, 34px); align-items: flex-start; }
.chapter-index {
  font-family: var(--mono);
  font-size: 0.84rem;
  letter-spacing: 0.14em;
  color: var(--copper-dark);
  font-weight: 700;
  padding-top: 0.5em;
  flex: 0 0 auto;
}
.chapter-titlewrap { min-width: 0; flex: 1; }
.chapter-kicker { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted-light); margin: 0 0 12px; }
.chapter-title { font-family: var(--serif); font-weight: 400; font-size: clamp(1.7rem, 3vw, 2.5rem); line-height: 1.12; letter-spacing: -0.018em; color: var(--ink-light); margin: 0; text-wrap: balance; }
.chapter-title em { font-style: italic; color: var(--copper-dark); }
.chapter-lead { margin-top: clamp(22px, 3vh, 34px); }
.chapter-lead .body { max-width: var(--readw); }

/* subsection list — collapsed by default */
.subs { margin-top: clamp(26px, 3.6vh, 40px); border-top: 1px solid var(--rule-light); }
.sub { border-bottom: 1px solid var(--rule-light); }
.sub-toggle {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 18px;
  padding: 20px 0;
  background: transparent;
  border: 0;
  cursor: pointer;
  text-align: left;
  color: var(--ink-light);
  font-family: inherit;
}
.sub-toggle:hover .sub-name { color: var(--copper-dark); }
.sub-name {
  font-family: var(--serif);
  font-weight: 450;
  font-size: clamp(1.16rem, 1.7vw, 1.42rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  transition: color 0.22s ease;
  text-wrap: balance;
}
.sub-meta { display: flex; align-items: center; gap: 16px; flex: 0 0 auto; }
.sub-tag { font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted-light); }
.sub-chev { width: 16px; height: 16px; flex: 0 0 auto; position: relative; }
.sub-chev::before, .sub-chev::after { content: ""; position: absolute; top: 50%; width: 9px; height: 1.6px; background: var(--copper-dark); transition: transform 0.3s cubic-bezier(0.22,1,0.36,1); }
.sub-chev::before { left: 0; transform: translateY(-50%) rotate(45deg); }
.sub-chev::after { right: 0; transform: translateY(-50%) rotate(-45deg); }
.sub[data-open="true"] .sub-chev::before { transform: translateY(-50%) rotate(-45deg); }
.sub[data-open="true"] .sub-chev::after { transform: translateY(-50%) rotate(45deg); }

.sub-body { overflow: hidden; height: 0; transition: height 0.4s cubic-bezier(0.22,1,0.36,1); }
.sub-body-inner { padding: 4px 0 30px; }
.sub[data-open="true"] .sub-toggle .sub-name { color: var(--ink-light); }
.sub-body-inner > * + * { margin-top: 1.1em; }
.sub-body-inner .body { max-width: var(--readw); }

/* fallback: JS off → all open */
.no-js .sub-body { height: auto !important; }

/* ---- expand/collapse all control ---- */
.chapter-controls { display: flex; gap: 10px; margin-top: 26px; }
.ctl-btn {
  font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.14em; text-transform: uppercase; font-weight: 700;
  color: var(--muted-light); background: transparent; border: 1px solid var(--rule-light); padding: 8px 13px; cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.ctl-btn:hover { color: var(--copper-dark); border-color: var(--copper-dark); }

/* ============================================================
   INLINE PLAIN-LANGUAGE JARGON (dfn)
   ============================================================ */
dfn.term { font-style: normal; }
/* default (plain language OFF): jargon reads as plain text */
dfn.term .term-trigger { cursor: text; }
/* plain language ON */
.pl-on dfn.term .term-trigger {
  cursor: help;
  border-bottom: 1px dashed var(--copper-dark);
  color: inherit;
}
.pl-on dfn.term .term-trigger::after {
  content: "?";
  font-family: var(--mono);
  font-size: 0.62em;
  font-weight: 700;
  vertical-align: super;
  color: var(--copper-dark);
  margin-left: 1px;
}
.pl-on dfn.term .term-trigger:hover { color: var(--copper-dark); }
dfn.term[data-open="true"] .term-trigger { color: var(--copper-dark); }

/* inline reveal box */
.term-def {
  display: none;
  margin: 14px 0;
  padding: 16px 18px;
  border-left: 2px solid var(--copper-dark);
  background: var(--paper);
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--muted-light);
  max-width: 60ch;
}
dfn.term[data-open="true"] .term-def { display: block; }
.term-def .term-def-name {
  display: block;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper-dark);
  margin-bottom: 6px;
}
.term-def b { color: var(--ink-light); font-weight: 600; }

/* ============================================================
   CITATION REFS — superscript with tooltip
   ============================================================ */
.cref {
  font-family: var(--mono);
  font-size: 0.6em;
  font-weight: 700;
  vertical-align: super;
  line-height: 0;
  color: var(--copper-dark);
  cursor: pointer;
  padding: 0 1px;
  white-space: nowrap;
  transition: color 0.18s ease;
}
.cref:hover, .cref.is-active { color: var(--copper); }
.cref-tip {
  position: fixed;
  z-index: 200;
  max-width: 340px;
  background: var(--midnight);
  color: var(--warm-white);
  border: 1px solid var(--midnight-3);
  padding: 14px 16px;
  box-shadow: 0 22px 50px -22px rgba(8,8,28,0.8);
  font-size: 0.84rem;
  line-height: 1.5;
  opacity: 0;
  transform: translateY(4px);
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
}
.cref-tip.is-shown { opacity: 1; transform: translateY(0); pointer-events: auto; }
.cref-tip .cref-tip-row + .cref-tip-row { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--rule-dark); }
.cref-tip .cref-n { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.1em; color: var(--copper); font-weight: 700; }
.cref-tip .cref-text { display: block; margin-top: 4px; color: var(--muted-dark); }
.cref-tip a.cref-src { display: inline-block; margin-top: 7px; font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.06em; color: var(--copper); border-bottom: 1px solid transparent; word-break: break-all; }
.cref-tip a.cref-src:hover { border-color: var(--copper); }

/* ============================================================
   CARD TABLES (article comparison tables → cards)
   ============================================================ */
.cardset { margin: 8px 0 4px; }
.cardset-label { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--copper-dark); margin: 0 0 16px; display: flex; align-items: center; gap: 0.7em; }
.cardset-label::before { content: ""; width: 18px; height: 1px; background: var(--copper-dark); }
.cardgrid { display: grid; gap: 1px; background: var(--rule-light); border: 1px solid var(--rule-light); }
.cardgrid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cardgrid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cardgrid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.dcard { background: var(--white); padding: clamp(20px, 2.2vw, 28px); display: flex; flex-direction: column; gap: 12px; }
.dcard-title { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--copper-dark); font-weight: 700; margin: 0; }
.dcard-rows { display: flex; flex-direction: column; gap: 11px; margin: 0; }
.dcard-row { display: flex; flex-direction: column; gap: 3px; }
.dcard-row dt { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted-light); }
.dcard-row dd { margin: 0; font-size: 0.96rem; line-height: 1.42; color: var(--ink-light); }
.dcard-row dd.hot { color: var(--copper-dark); font-weight: 600; }
.dcard--hot { background: var(--paper); }
@media (max-width: 860px) { .cardgrid.cols-3, .cardgrid.cols-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .cardgrid.cols-2, .cardgrid.cols-3, .cardgrid.cols-4 { grid-template-columns: 1fr; } }

/* taxonomy table variant — rows of substrate */
.taxo { display: grid; gap: 1px; background: var(--rule-light); border: 1px solid var(--rule-light); margin: 8px 0 4px; }
.taxo-row { background: var(--white); padding: clamp(18px, 2vw, 26px) clamp(20px, 2.2vw, 28px); display: grid; grid-template-columns: 1.1fr 1fr 1fr; gap: clamp(14px, 2vw, 28px); }
.taxo-row.taxo-head { background: var(--paper); }
.taxo-cell-label { font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted-light); margin: 0 0 6px; }
.taxo-head .taxo-cell-label { color: var(--copper-dark); }
.taxo-cell-val { font-size: 0.95rem; line-height: 1.45; color: var(--ink-light); margin: 0; }
.taxo-substrate { font-weight: 600; }
@media (max-width: 760px) { .taxo-row { grid-template-columns: 1fr; gap: 10px; } }

/* ---- expand-to-full-width control for tables ---- */
.cardset, .taxo { position: relative; }
.cardset-label.has-expand .tbl-expand { margin-left: auto; }
.tbl-bar { display: flex; justify-content: flex-end; margin: 0 0 12px; }
.tbl-expand {
  appearance: none; -webkit-appearance: none;
  border: 1px solid var(--rule-light); background: transparent;
  font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--copper-dark); cursor: pointer; padding: 6px 11px;
  display: inline-flex; align-items: center; gap: 8px; line-height: 1; white-space: nowrap;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.tbl-expand:hover { background: var(--white); border-color: var(--copper-dark); }
.tbl-expand.is-wide { background: var(--copper-dark); border-color: var(--copper-dark); color: var(--warm-white); }
.tbl-expand-ico { width: 12px; height: 12px; position: relative; flex: 0 0 auto; }
.tbl-expand-ico::before, .tbl-expand-ico::after { content: ""; position: absolute; width: 6px; height: 6px; }
.tbl-expand-ico::before { top: 0; left: 0; border-top: 1.4px solid currentColor; border-left: 1.4px solid currentColor; }
.tbl-expand-ico::after { bottom: 0; right: 0; border-bottom: 1.4px solid currentColor; border-right: 1.4px solid currentColor; }
.tbl-expand.is-wide .tbl-expand-ico::before { top: 0; left: 0; border-top: 1.4px solid currentColor; border-left: 1.4px solid currentColor; transform: translate(3px,3px); }
.tbl-expand.is-wide .tbl-expand-ico::after { bottom: 0; right: 0; transform: translate(-3px,-3px); }
.cardset.is-wide .cardgrid, .taxo.is-wide { box-shadow: 0 18px 50px -28px rgba(28,28,67,0.4); }
@media (max-width: 940px) { .tbl-expand, .tbl-bar { display: none; } }

/* ---- pull / property strip inside chapters ---- */
.prop-strip {
  margin: clamp(26px,3.6vh,40px) 0 6px;
  padding-top: 24px;
  border-top: 1px solid var(--rule-light);
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: clamp(18px, 3vw, 48px);
  max-width: 900px;
}
.prop-label { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--copper-dark); padding-top: 3px; }
.prop-value { margin: 0; color: var(--ink-light); max-width: 56ch; text-wrap: pretty; }
@media (max-width: 620px) { .prop-strip { grid-template-columns: 1fr; gap: 10px; } }

/* list inside subsections */
.doc-list { margin: 0; padding: 0; list-style: none; max-width: var(--readw); }
.doc-list li { position: relative; padding-left: 26px; margin: 0; }
.doc-list li + li { margin-top: 0.9em; }
.doc-list li::before { content: ""; position: absolute; left: 4px; top: 0.62em; width: 6px; height: 6px; background: var(--copper-dark); }
.doc-list li b { color: var(--ink-light); font-weight: 600; }
.doc-list.ordered { counter-reset: dl; }
.doc-list.ordered li::before { content: counter(dl); counter-increment: dl; background: transparent; left: 0; top: 0; width: auto; height: auto; font-family: var(--mono); font-size: 0.8rem; font-weight: 700; color: var(--copper-dark); }

/* ============================================================
   STATEMENT island
   ============================================================ */
.statement-block { text-align: center; padding-block: clamp(110px, 15vh, 200px); background: #e1e3ed; position: relative; z-index: 1; }
.statement-divider { display: block; width: clamp(48px, 6vw, 72px); height: 1px; background: var(--copper-dark); margin: 0 auto clamp(34px, 5vh, 54px); }
.statement { font-family: var(--serif); font-style: italic; font-weight: 400; font-size: clamp(1.8rem, 4vw, 3.1rem); line-height: 1.2; letter-spacing: -0.01em; margin: 0 auto; max-width: 22ch; text-wrap: balance; color: var(--ink-light); }
.statement em { font-weight: 560; color: var(--copper-dark); }
.statement-attr { margin-top: 24px; font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted-light); }
body[data-statement="dark"] .statement-block { background: var(--midnight); color: var(--warm-white); }
body[data-statement="dark"] .statement { color: var(--warm-white); }
body[data-statement="dark"] .statement em { color: var(--copper); }
body[data-statement="dark"] .statement-attr { color: var(--muted-dark); }

/* ============================================================
   FROM THE AUTHORS
   ============================================================ */
.authors { position: relative; z-index: 1; padding-block: clamp(64px, 9vh, 120px); border-top: 1px solid var(--rule-light); overflow: hidden; background: var(--paper); }
.authors-canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; pointer-events: none; }
.authors .wrap { position: relative; z-index: 1; }
@media (max-width: 860px) { .authors-canvas { display: none; } }
.authors-eyebrow { margin-bottom: 26px; }
.authors-grid { display: grid; grid-template-columns: minmax(0,1fr); gap: clamp(20px,3vh,30px); }
.authors h2 { font-family: var(--serif); font-weight: 400; font-size: clamp(1.6rem, 2.8vw, 2.3rem); line-height: 1.16; letter-spacing: -0.016em; color: var(--ink-light); margin: 0 0 8px; max-width: 22ch; text-wrap: balance; }
.authors h2 em { font-style: italic; color: var(--copper-dark); }
.authors .body { max-width: 46ch; }
.authors-cta { margin-top: 10px; display: flex; gap: 16px; flex-wrap: wrap; align-items: center; }
.link-copper { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; color: var(--copper-dark); border-bottom: 1px solid var(--copper-dark); padding-bottom: 1px; }
.link-copper:hover { color: var(--copper); }

/* ============================================================
   POST-REPORT INVITATION
   ============================================================ */
.post-report { padding: clamp(40px, 6vh, 72px) 0; border-top: 1px solid var(--rule-light); position: relative; z-index: 1; background: var(--white); }
.post-report .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 22px 40px; }
.post-report-text { font-family: var(--serif); font-weight: 400; font-size: clamp(1.12rem, 1.6vw, 1.42rem); line-height: 1.38; letter-spacing: -0.01em; color: var(--ink-light); max-width: 42ch; margin: 0; text-wrap: pretty; }
.post-report-btn { font-family: var(--mono); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; color: var(--copper-dark); border: 1px solid var(--copper-dark); padding: 13px 22px; display: inline-flex; align-items: center; gap: 10px; white-space: nowrap; flex: 0 0 auto; transition: background 0.2s ease, color 0.2s ease; }
.post-report-arr { transition: transform 0.2s ease; }
.post-report-btn:hover { background: var(--copper-dark); color: var(--white); }
.post-report-btn:hover .post-report-arr { transform: translateY(3px); }

/* ============================================================
   PUBLICATIONS
   ============================================================ */
.papers { position: relative; z-index: 1; padding: clamp(56px, 8vh, 104px) 0 clamp(64px, 9vh, 120px); border-top: 1px solid var(--rule-light); }
.papers-head { max-width: var(--maxw); }
.papers-title {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(1.7rem, 3vw, 2.5rem); line-height: 1.12;
  letter-spacing: -0.018em; color: var(--ink-light);
  margin: 22px 0 0; max-width: 20ch; text-wrap: balance;
}
.papers-title em { font-style: italic; color: var(--copper-dark); }
.papers-intro { margin-top: clamp(18px, 2.4vh, 26px); max-width: var(--readw); color: var(--muted-light); }

/* feature grid — the four highlighted papers */
.papers-feature {
  margin-top: clamp(34px, 4.5vh, 52px);
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1px; background: var(--rule-light);
  border: 1px solid var(--rule-light);
}
.paper-card { background: var(--paper); padding: clamp(24px, 2.4vw, 36px); display: flex; flex-direction: column; }
.paper-card-top { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.paper-num { font-family: var(--mono); font-size: 1.04rem; font-weight: 700; letter-spacing: 0.06em; color: var(--copper-dark); }
.paper-tag { font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted-light); border: 1px solid var(--rule-light); padding: 4px 9px; }
.paper-card-title {
  font-family: var(--serif); font-weight: 450;
  font-size: clamp(1.14rem, 1.5vw, 1.4rem); line-height: 1.2;
  letter-spacing: -0.01em; color: var(--ink-light); margin: 0; text-wrap: balance;
}
.paper-card-sum { margin: 13px 0 0; font-size: 0.95rem; line-height: 1.5; color: var(--muted-light); text-wrap: pretty; }
.paper-foot { margin-top: auto; padding-top: 22px; display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px 18px; }
.paper-venue { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.06em; color: var(--muted-light); }
.paper-link { font-family: var(--mono); font-size: 0.66rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--copper-dark); display: inline-flex; align-items: center; gap: 7px; white-space: nowrap; transition: color 0.2s ease; }
.paper-arr { transition: transform 0.2s ease; }
.paper-link:hover { color: var(--copper); }
.paper-link:hover .paper-arr { transform: translate(2px, -2px); }

/* collapsed list — reuses the .sub collapse mechanism */
.paper-list { list-style: none; margin: 0; padding: 0; }
.paper-row { display: flex; gap: 18px; padding: 15px 0; border-top: 1px solid var(--rule-light); }
.paper-row:first-child { border-top: none; padding-top: 4px; }
.paper-row-num { font-family: var(--mono); font-size: 0.76rem; font-weight: 700; letter-spacing: 0.04em; color: var(--copper-dark); flex: 0 0 2.6em; padding-top: 0.2em; }
.paper-row-body { min-width: 0; display: flex; flex-direction: column; gap: 5px; }
.paper-row-title { font-family: var(--serif); font-size: 1.04rem; line-height: 1.3; color: var(--ink-light); text-wrap: pretty; transition: color 0.2s ease; }
.paper-row-title .paper-arr { font-family: var(--mono); font-size: 0.78em; color: var(--muted-light); margin-left: 7px; display: inline; }
.paper-row-title:hover { color: var(--copper-dark); }
.paper-row-title:hover .paper-arr { color: var(--copper-dark); }
.paper-row-meta { font-family: var(--mono); font-size: 0.63rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted-light); }

@media (max-width: 720px) {
  .papers-feature { grid-template-columns: 1fr; }
  .paper-row-num { flex-basis: 2.2em; }
}

/* ============================================================
   CLOSING (dark)
   ============================================================ */
.closing { text-align: center; padding-block: clamp(96px, 14vh, 184px); }
.closing .display { max-width: 22ch; margin: 0 auto; }
.closing .lede { margin: clamp(40px,6vh,72px) auto 0; text-align: center; max-width: 62ch; }
.reinforce { margin: 28px auto 0; max-width: 50ch; color: var(--copper); font-size: 1.1rem; line-height: 1.5; text-wrap: pretty; }
.closing .hero-cta { justify-content: center; margin-top: 40px; }

/* ============================================================
   WORKS CITED — collapsible appendix
   ============================================================ */
.appendix { position: relative; z-index: 1; background: #e1e3ed; padding-block: clamp(56px, 8vh, 100px); border-top: 1px solid var(--rule-light); }
.appendix-head { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 20px; cursor: pointer; }
.appendix-head h2 { font-family: var(--serif); font-weight: 400; font-size: clamp(1.4rem, 2.4vw, 2rem); color: var(--ink-light); margin: 0; }
.appendix-eyebrow { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--copper-dark); margin: 0 0 12px; }
.appendix-count { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.1em; color: var(--muted-light); display: flex; align-items: center; gap: 14px; }
.appendix-chev { width: 18px; height: 18px; position: relative; }
.appendix-chev::before, .appendix-chev::after { content: ""; position: absolute; top: 50%; width: 10px; height: 1.6px; background: var(--copper-dark); transition: transform 0.3s cubic-bezier(0.22,1,0.36,1); }
.appendix-chev::before { left: 0; transform: translateY(-50%) rotate(45deg); }
.appendix-chev::after { right: 0; transform: translateY(-50%) rotate(-45deg); }
.appendix[data-open="true"] .appendix-chev::before { transform: translateY(-50%) rotate(-45deg); }
.appendix[data-open="true"] .appendix-chev::after { transform: translateY(-50%) rotate(45deg); }
.appendix-body { overflow: hidden; height: 0; transition: height 0.45s cubic-bezier(0.22,1,0.36,1); }
.appendix-list { columns: 2; column-gap: clamp(30px, 5vw, 72px); margin: 30px 0 0; padding: 0; list-style: none; }
@media (max-width: 760px) { .appendix-list { columns: 1; } }
.cite-entry { break-inside: avoid; padding: 11px 0; border-top: 1px solid var(--rule-light); display: grid; grid-template-columns: 32px 1fr; gap: 12px; font-size: 0.82rem; line-height: 1.45; color: var(--muted-light); }
.cite-entry:target { background: rgba(243,136,70,0.08); }
.cite-entry .cite-n { font-family: var(--mono); font-weight: 700; color: var(--copper-dark); }
.cite-entry .cite-src { color: var(--ink-light); }
.cite-entry a { color: var(--copper-dark); word-break: break-all; border-bottom: 1px solid transparent; }
.cite-entry a:hover { border-color: var(--copper-dark); }

/* ============================================================
   FOOTER (dark)
   ============================================================ */
.footer { position: relative; z-index: 1; background: var(--midnight); padding: 72px var(--gutter) 32px; border-top: 1px solid var(--rule-dark); }
.footer-row { max-width: var(--maxw); margin: 0 auto; display: flex; justify-content: space-between; align-items: center; gap: 24px; flex-wrap: wrap; }
.footer .wordmark { font-size: 1.14rem; }
.footer .wordmark .lab { color: var(--copper); }
.footer-contact { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }
.footer-social { display: inline-flex; align-items: center; gap: 8px; color: var(--copper); }
.footer-social svg { flex-shrink: 0; }
.footer-social span { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.08em; border-bottom: 1px solid transparent; transition: border-color 0.3s ease; }
.footer-social:hover span { border-color: var(--copper); }
.footer-loc { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.06em; color: var(--muted-dark); display: inline-flex; align-items: center; gap: 8px; }
.footer-loc .flag { font-size: 0.95rem; line-height: 1; }
.footer-trace-row { max-width: var(--maxw); margin: 70px auto 0; text-align: center; }
.footer-trace { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.08em; color: var(--muted-dark); }

/* ============================================================
   REVEAL
   ============================================================ */
[data-reveal] {
  opacity: 1; transform: none;
  transition: opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1), transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: var(--delay, 0ms);
}
html.reveal-armed [data-reveal]:not(.is-in) { opacity: 0; transform: translateY(22px); }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1 !important; transform: none !important; transition: none; }
  .hero-inner { opacity: 1 !important; transform: none !important; }
  html { scroll-behavior: auto; }
}

/* nav settle */
@media (prefers-reduced-motion: no-preference) {
  .nav { animation: navDrop 0.9s cubic-bezier(0.22, 1, 0.36, 1) both; }
}
@keyframes navDrop { from { opacity: 0; transform: translateY(-100%); } to { opacity: 1; transform: translateY(0); } }

/* emphasis underline */
.hero-h em, .closing .display em, .statement em { position: relative; }
.hero-h em::after, .closing .display em::after, .statement em::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -0.04em; height: 2px;
  background: var(--accent); transform: scaleX(0); transform-origin: left center;
  transition: transform 1s cubic-bezier(0.22, 1, 0.36, 1); transition-delay: 0.45s;
}
.statement em::after { transform-origin: center; bottom: 0.04em; }
.hero-h.is-in em::after, .closing .display.is-in em::after, .statement.is-in em::after { transform: scaleX(1); }
@media (prefers-reduced-motion: reduce) {
  .hero-h em::after, .closing .display em::after, .statement em::after { transition: none; transform: scaleX(1); }
  .nav { animation: none !important; }
}

/* ============================================================
   RESPONSIVE NAV
   ============================================================ */
@media (max-width: 720px) {
  .nav-cta { display: none; }
  .brand-sep { display: none; }
  .nav-up { display: none; }
}
@media (max-width: 460px) {
  .pl-toggle span.pl-text { display: none; }
}