:root {
  --paper: #f3eee3;
  --paper-2: #e7decc;
  --ink: #211712;
  --brown: #302019;
  --brown-2: #17100d;
  --red: #c72219;
  --gold: #d4af55;
  --sage: #dfe3cb;
  --white: #fff9ee;
  --muted: #786a61;
  --line: rgba(33, 23, 18, 0.22);
  --line-inverse: rgba(255, 249, 238, 0.22);
  --ease: cubic-bezier(0.23, 1, 0.32, 1);
  --serif: "Fraunces", serif;
  --sans: "Instrument Sans", sans-serif;
  --mono: "JetBrains Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); }
button, a { font: inherit; }
button { color: inherit; }
button:focus-visible, a:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }

.project-nav {
  min-height: 68px;
  padding: 0 clamp(1.1rem, 4vw, 4rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(243, 238, 227, 0.94);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 30;
  font: 500 0.7rem/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.project-nav a { color: inherit; text-decoration: none; }
.project-nav a:hover { color: var(--red); }

.reader-hero,
.packet-section,
.search-section,
.rebase-section,
.scale-section,
.construction-section,
.mitigation-section,
.value-section,
.limits-section {
  padding: clamp(4.5rem, 8vw, 8rem) clamp(1.25rem, 5vw, 6rem);
}

.reader-hero {
  min-height: calc(100svh - 68px);
  display: grid;
  align-content: center;
  gap: 2rem;
  overflow: hidden;
  position: relative;
}
.reader-hero::after {
  content: "↗";
  position: absolute;
  right: -3vw;
  bottom: -10vw;
  color: rgba(199, 34, 25, 0.055);
  font: 400 clamp(18rem, 43vw, 40rem)/0.8 var(--serif);
  pointer-events: none;
}
.eyebrow,
.section-label {
  color: var(--red);
  font: 500 0.69rem/1.2 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.reader-hero h1 {
  max-width: 1250px;
  margin: 0;
  position: relative;
  z-index: 1;
  font: 400 clamp(4rem, 9vw, 9rem)/0.87 var(--serif);
  letter-spacing: -0.055em;
}
.reader-hero h1 em { color: var(--red); font-weight: 400; }
.research-brief {
  max-width: 1180px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-block: 1px solid var(--line);
  position: relative;
  z-index: 1;
}
.research-brief p { margin: 0; padding: 1.2rem; display: grid; gap: 0.7rem; }
.research-brief p + p { border-left: 1px solid var(--line); }
.research-brief b { color: var(--red); font: 500 0.68rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; }
.research-brief span { font: 500 0.9rem/1.5 var(--sans); }
.jump { width: max-content; color: inherit; text-decoration: none; border-bottom: 1px solid; padding-bottom: 0.3rem; font: 500 0.75rem/1 var(--mono); }
.jump:hover { color: var(--red); }

.journey-rail {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border-block: 1px solid var(--line);
  background: var(--paper-2);
}
.journey-rail a {
  min-height: 88px;
  padding: 1rem clamp(0.8rem, 2vw, 1.5rem);
  display: grid;
  align-content: center;
  gap: 0.5rem;
  color: inherit;
  text-decoration: none;
  transition: background-color 180ms ease, color 180ms ease;
}
.journey-rail a + a { border-left: 1px solid var(--line); }
.journey-rail a:hover { background: var(--red); color: var(--white); }
.journey-rail span { font: 500 0.65rem/1 var(--mono); color: var(--red); }
.journey-rail a:hover span { color: var(--white); }
.journey-rail b { font: 500 0.86rem/1.2 var(--sans); }

.section-intro {
  max-width: 1450px;
  margin: 0 auto 3rem;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.6fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: end;
}
.section-intro h2,
.limits-section h2 {
  margin: 0.7rem 0 0;
  max-width: 1050px;
  font: 400 clamp(2.8rem, 6vw, 6rem)/0.96 var(--serif);
  letter-spacing: -0.045em;
}
.section-intro > p { margin: 0; color: var(--muted); font: 400 1rem/1.6 var(--sans); }
.section-intro.inverse > p { color: rgba(255, 249, 238, 0.7); }

.packet-section { background: var(--paper); }
.representation-tabs {
  max-width: 1450px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--line);
}
.representation-tabs button {
  appearance: none;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  padding: 1.1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  cursor: pointer;
  font: 400 1.3rem/1 var(--serif);
  transition: background-color 180ms ease, color 180ms ease;
}
.representation-tabs button:last-child { border-right: 0; }
.representation-tabs button span { color: var(--red); font: 500 0.66rem/1 var(--mono); }
.representation-tabs button[aria-selected="true"] { background: var(--brown); color: var(--white); }
.representation-tabs button[aria-selected="true"] span { color: var(--gold); }
.representation-stage {
  max-width: 1450px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  min-height: 470px;
  background: var(--brown);
  color: var(--white);
}
.packet-view {
  min-height: 470px;
  padding: clamp(1.5rem, 4vw, 3rem);
  display: grid;
  grid-template-columns: repeat(20, 1fr);
  gap: clamp(3px, 0.6vw, 8px);
  align-items: end;
  background: var(--paper-2);
  border: 1rem solid var(--brown);
}
.packet-view i {
  height: var(--h);
  background: var(--red);
  transform-origin: bottom;
  transition: height 260ms var(--ease), transform 180ms var(--ease), background-color 180ms ease;
}
.packet-view i:hover { transform: scaleY(1.04); background: #e04034; }
.packet-view.schema { grid-template-columns: repeat(3, 1fr); align-items: stretch; }
.packet-view.schema i {
  height: auto;
  padding: 1rem;
  display: grid;
  place-items: center;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--line);
  font: 500 0.68rem/1.3 var(--mono);
  text-align: center;
}
.representation-reading { padding: clamp(1.5rem, 4vw, 3.2rem); display: flex; flex-direction: column; }
.representation-reading > span { color: var(--gold); font: 500 0.68rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.07em; }
.representation-reading h3 { margin: 1rem 0; font: 400 clamp(2.2rem, 4vw, 4rem)/1 var(--serif); }
.representation-reading > p { max-width: 520px; margin: 0; color: rgba(255, 249, 238, 0.7); font: 400 0.95rem/1.55 var(--sans); }
.representation-result { margin-top: auto; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line-inverse); }
.representation-result p { margin: 0; padding: 1rem 0; }
.representation-result p + p { padding-left: 1rem; border-left: 1px solid var(--line-inverse); }
.representation-result small, .representation-result b { display: block; }
.representation-result small { color: rgba(255, 249, 238, 0.55); font: 500 0.62rem/1.3 var(--mono); text-transform: uppercase; }
.representation-result b { margin-top: 0.7rem; font: 400 clamp(1.3rem, 2.5vw, 2.2rem)/1 var(--serif); }

.search-section,
.construction-section,
.value-section { max-width: none; background: var(--brown); color: var(--white); }
.search-workbench { max-width: 1450px; margin: 0 auto; border: 1px solid var(--line-inverse); background: var(--brown-2); }
.search-controls { display: grid; grid-template-columns: 1fr 0.65fr 1.45fr; border-bottom: 1px solid var(--line-inverse); }
.control-group { padding: 1rem; display: flex; align-items: center; gap: 0.35rem; flex-wrap: wrap; }
.control-group + .control-group { border-left: 1px solid var(--line-inverse); }
.control-group > span, .scale-controls span {
  flex: 0 0 100%;
  margin-bottom: 0.35rem;
  color: var(--gold);
  font: 500 0.63rem/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.control-group button,
.toggle button,
.scale-controls button,
.mitigation-tabs button {
  appearance: none;
  border: 1px solid currentColor;
  border-radius: 999px;
  background: transparent;
  color: inherit;
  padding: 0.65rem 0.85rem;
  cursor: pointer;
  font: 500 0.68rem/1 var(--mono);
  transition: transform 150ms var(--ease), background-color 150ms ease, color 150ms ease, border-color 150ms ease;
}
.control-group button:hover, .toggle button:hover { background: rgba(255, 249, 238, 0.08); }
.control-group button:active, .toggle button:active, .scale-controls button:active, .mitigation-tabs button:active { transform: scale(0.97); }
.control-group button[aria-pressed="true"], .toggle button[aria-pressed="true"] { background: var(--gold); border-color: var(--gold); color: var(--ink); }
.search-stage { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(320px, 0.55fr); min-height: 520px; }
.trajectory-card, .candidate-card { margin: 0; min-width: 0; }
.trajectory-card { border-right: 1px solid var(--line-inverse); }
.trajectory-card header, .candidate-card header, .rebase-case header, .aggregate-ablation header {
  min-height: 54px;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line-inverse);
  font: 500 0.68rem/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.trajectory-card header b { color: var(--gold); }
.trajectory-card canvas { display: block; width: 100%; height: 410px; transition: opacity 120ms ease; }
.trajectory-card.is-updating canvas { opacity: 0.55; }
.trajectory-key { min-height: 52px; padding: 0 1rem; display: flex; align-items: center; gap: 1.5rem; color: rgba(255, 249, 238, 0.62); font: 500 0.64rem/1 var(--mono); }
.trajectory-key span::before { content: ""; width: 1.4rem; height: 3px; display: inline-block; margin-right: 0.5rem; vertical-align: middle; background: var(--red); }
.trajectory-key .candidate-key::before { background: var(--gold); }
.candidate-card header b { color: rgba(255, 249, 238, 0.55); }
.candidate-list button {
  width: 100%;
  min-height: 78px;
  padding: 0.9rem 1rem;
  display: grid;
  grid-template-columns: 2.3rem 1fr auto;
  align-items: center;
  gap: 0.8rem;
  border: 0;
  border-bottom: 1px solid rgba(255, 249, 238, 0.12);
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color 150ms ease, color 150ms ease, padding-left 180ms var(--ease);
}
.candidate-list button:hover { background: rgba(255, 249, 238, 0.06); padding-left: 1.25rem; }
.candidate-list button.selected { background: var(--gold); color: var(--ink); }
.candidate-list button > span { font: 500 0.7rem/1 var(--mono); }
.candidate-list button b { font: 500 0.9rem/1.2 var(--sans); }
.candidate-list button small { display: block; margin-top: 0.25rem; opacity: 0.62; font: 400 0.65rem/1 var(--mono); }
.candidate-list button i { font: 400 0.66rem/1 var(--mono); font-style: normal; }
.candidate-list button.truth b::after { content: "answer key"; margin-left: 0.55rem; color: var(--gold); font: 500 0.55rem/1 var(--mono); text-transform: uppercase; }
.candidate-list button.selected.truth b::after { color: var(--ink); }
.search-insight { display: grid; grid-template-columns: 0.65fr 0.35fr 1fr; border-top: 1px solid var(--line-inverse); }
.search-insight > * { min-height: 92px; margin: 0; padding: 1rem; display: grid; align-content: center; }
.search-insight > * + * { border-left: 1px solid var(--line-inverse); }
.search-insight span { color: var(--gold); font: 500 0.62rem/1 var(--mono); text-transform: uppercase; }
.search-insight strong { margin-top: 0.5rem; font: 400 1.35rem/1 var(--serif); }
.search-insight > p:last-child { color: rgba(255, 249, 238, 0.72); font: 400 0.9rem/1.5 var(--sans); }

.claim-boundary { max-width: 1450px; margin: 1.2rem auto 0; padding: 1.15rem; display: grid; grid-template-columns: 0.3fr 1fr; gap: 1rem; background: var(--red); color: var(--white); font: 500 0.84rem/1.5 var(--sans); }
.claim-boundary b { font-family: var(--serif); font-size: 1.15rem; font-weight: 400; }
.claim-boundary:not(.inverse) { background: var(--brown); }

.exposure-story { max-width: 1450px; margin: clamp(4rem, 7vw, 7rem) auto 0; }
.exposure-story header { max-width: 950px; }
.exposure-story h3 { margin: 0.7rem 0 2rem; font: 400 clamp(2.5rem, 5vw, 5rem)/0.98 var(--serif); letter-spacing: -0.04em; }
.exposure-lanes { border: 1px solid var(--line-inverse); }
.exposure-lanes article { min-height: 270px; padding: 1.5rem; display: grid; grid-template-columns: 0.42fr 1fr; gap: 1.5rem; }
.exposure-lanes article + article { border-top: 1px solid var(--line-inverse); }
.exposure-lanes article > div:first-child { display: grid; align-content: start; gap: 0.7rem; }
.exposure-lanes article > div:first-child span { color: var(--gold); font: 500 0.67rem/1 var(--mono); text-transform: uppercase; }
.exposure-lanes article > div:first-child b { font: 400 2.2rem/1 var(--serif); }
.exposure-lanes article > p { grid-column: 1; margin: auto 0 0; color: rgba(255, 249, 238, 0.62); font: 400 0.72rem/1.5 var(--mono); }
.exposure-track { grid-column: 2; grid-row: 1 / 3; position: relative; min-height: 185px; border-bottom: 1px solid rgba(255, 249, 238, 0.35); }
.exposure-track::before { content: ""; position: absolute; left: 0; right: 0; top: 56%; height: 3px; background: var(--gold); }
.exposure-track i { position: absolute; left: var(--x); top: 56%; width: 14px; height: 14px; transform: translate(-50%, -50%); border-radius: 50%; background: var(--red); font-style: normal; }
.exposure-track small, .exposure-track strong { position: absolute; left: 50%; transform: translateX(-50%); white-space: nowrap; text-align: center; }
.exposure-track small { top: 1.2rem; font: 500 0.64rem/1 var(--mono); color: rgba(255, 249, 238, 0.62); }
.exposure-track strong { bottom: 1.2rem; font: 400 1rem/1.35 var(--mono); }

.rebase-section { background: var(--paper-2); }
.rebase-workbench { max-width: 1450px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; background: var(--brown); color: var(--white); }
.rebase-case { border-right: 1px solid var(--line-inverse); }
.rebase-case header, .aggregate-ablation header { min-height: 76px; }
.rebase-case header > span, .aggregate-ablation header > span { color: var(--gold); }
.toggle { display: flex; gap: 0.4rem; }
.rebase-case canvas { display: block; width: 100%; height: 400px; transition: opacity 120ms ease; }
.rebase-case.is-updating canvas { opacity: 0.55; }
.channel-bars { padding: clamp(1.5rem, 4vw, 3rem); display: grid; gap: 1rem; }
.channel-bars > div { display: grid; grid-template-columns: 9rem 1fr 3.7rem; gap: 0.8rem; align-items: center; font: 500 0.72rem/1 var(--mono); }
.channel-bars i { height: 12px; background: rgba(255, 249, 238, 0.12); overflow: hidden; }
.channel-bars i b { display: block; width: var(--w); height: 100%; background: var(--gold); transition: width 280ms var(--ease); }
.channel-bars strong { text-align: right; }
.reading-callout { max-width: 1450px; margin: 0 auto; padding: 1.25rem; display: grid; grid-template-columns: 0.3fr 1fr; gap: 1rem; background: var(--red); color: var(--white); }
.reading-callout b { font: 400 1.25rem/1.2 var(--serif); }
.reading-callout span { font: 500 0.86rem/1.5 var(--sans); }

.scale-section { background: var(--paper); }
.scale-console { max-width: 1450px; margin: 0 auto; border: 1px solid var(--line); }
.scale-controls { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--line); }
.scale-controls > div { padding: 1rem; display: flex; gap: 0.4rem; flex-wrap: wrap; }
.scale-controls > div + div { border-left: 1px solid var(--line); }
.scale-controls button[aria-pressed="true"] { background: var(--brown); border-color: var(--brown); color: var(--white); }
.scale-reading { display: grid; grid-template-columns: 1fr 1fr; }
.scale-reading p { min-height: 250px; margin: 0; padding: clamp(1.5rem, 4vw, 3rem); display: flex; flex-direction: column; }
.scale-reading p + p { border-left: 1px solid var(--line); }
.scale-reading span, .scale-reading small { font: 500 0.68rem/1.4 var(--mono); }
.scale-reading span { color: var(--red); text-transform: uppercase; }
.scale-reading strong { margin: auto 0 0.7rem; font: 400 clamp(4rem, 9vw, 8rem)/0.9 var(--serif); letter-spacing: -0.045em; }
.scale-reading small { color: var(--muted); }

.construction-flow { max-width: 1450px; margin: 0 auto; display: grid; grid-template-columns: repeat(6, 1fr); border: 1px solid var(--line-inverse); }
.construction-flow button {
  appearance: none;
  min-height: 110px;
  padding: 1rem;
  border: 0;
  border-right: 1px solid var(--line-inverse);
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
  font: 400 1.05rem/1.15 var(--serif);
  transition: background-color 160ms ease, color 160ms ease;
}
.construction-flow button:last-child { border-right: 0; }
.construction-flow button span { display: block; margin-bottom: 0.65rem; color: var(--gold); font: 500 0.64rem/1 var(--mono); }
.construction-flow button[aria-selected="true"] { background: var(--gold); color: var(--ink); }
.construction-flow button[aria-selected="true"] span { color: var(--ink); }
.construction-stage { max-width: 1450px; margin: 0 auto; padding: clamp(1.5rem, 4vw, 3rem); border: 1px solid var(--line-inverse); border-top: 0; background: var(--brown-2); }
.construction-stage > p { min-height: 76px; max-width: 900px; margin: 0 0 2rem; color: var(--gold); font: 400 clamp(1.15rem, 2.2vw, 1.8rem)/1.45 var(--mono); }
.construction-results { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line-inverse); }
.construction-results article { min-height: 190px; padding: 1.2rem; display: flex; flex-direction: column; }
.construction-results article + article { border-left: 1px solid var(--line-inverse); }
.construction-results span, .construction-results small { font: 500 0.66rem/1.4 var(--mono); }
.construction-results span { color: var(--gold); }
.construction-results strong { margin: auto 0 0.6rem; font: 400 clamp(2.4rem, 5vw, 4.5rem)/1 var(--serif); }
.construction-results small { color: rgba(255, 249, 238, 0.58); }

.mitigation-section { background: var(--sage); }
.mitigation-tabs { max-width: 1450px; margin: 0 auto; display: flex; gap: 0.5rem; flex-wrap: wrap; }
.mitigation-tabs button[aria-selected="true"] { background: var(--brown); border-color: var(--brown); color: var(--white); }
.mitigation-stage { max-width: 1450px; min-height: 420px; margin: 1rem auto 0; display: grid; grid-template-columns: 0.65fr 1.35fr 0.7fr; background: var(--paper); border: 1px solid var(--line); }
.mitigation-stage > * { margin: 0; padding: clamp(1.25rem, 3vw, 2.2rem); }
.mitigation-stage > * + * { border-left: 1px solid var(--line); }
.recovery-reading, .utility-reading { display: flex; flex-direction: column; }
.recovery-reading span, .utility-reading span { color: var(--red); font: 500 0.66rem/1 var(--mono); text-transform: uppercase; }
.recovery-reading strong { margin: auto 0 0.8rem; font: 400 clamp(4rem, 8vw, 7rem)/0.9 var(--serif); }
.recovery-reading p, .utility-reading p { color: var(--muted); font: 500 0.86rem/1.5 var(--sans); }
.utility-reading p { margin: auto 0; color: var(--ink); font: 400 1.25rem/1.45 var(--serif); }
.collision-visual { display: grid; grid-template-rows: auto 1fr; gap: 1.5rem; }
.collision-visual figcaption { color: var(--red); font: 500 0.64rem/1.3 var(--mono); text-transform: uppercase; }
.collision-field { display: grid; grid-template-columns: repeat(6, 1fr); gap: 0.6rem; align-items: center; }
.collision-field i { min-height: 10px; height: var(--h); background: var(--red); transform-origin: bottom; transition: height 260ms var(--ease), opacity 160ms ease; }
.open-set-callout { max-width: 1450px; margin: 0 auto; padding: 1.4rem; display: grid; grid-template-columns: 0.3fr 1fr; gap: 1.2rem; background: var(--red); color: var(--white); }
.open-set-callout > strong { font: 400 clamp(3rem, 7vw, 6rem)/0.9 var(--serif); }
.open-set-callout p { margin: 0; display: grid; align-content: center; gap: 0.5rem; }
.open-set-callout p b { font: 400 1.5rem/1.1 var(--serif); }
.open-set-callout p span { font: 500 0.84rem/1.5 var(--sans); }

.header-cards { max-width: 1450px; margin: 0 auto; display: grid; grid-template-columns: repeat(5, 1fr); border: 1px solid var(--line-inverse); }
.header-cards button {
  appearance: none;
  min-height: 115px;
  padding: 1rem;
  display: grid;
  align-content: center;
  gap: 0.65rem;
  border: 0;
  border-right: 1px solid var(--line-inverse);
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease;
}
.header-cards button:last-child { border-right: 0; }
.header-cards button b { font: 400 1.25rem/1 var(--serif); }
.header-cards button span { color: rgba(255, 249, 238, 0.58); font: 500 0.65rem/1 var(--mono); }
.header-cards button[aria-selected="true"] { background: var(--gold); color: var(--ink); }
.header-cards button[aria-selected="true"] span { color: var(--ink); }
.value-reading { max-width: 1450px; margin: 0 auto; display: grid; grid-template-columns: 1fr 0.6fr 0.6fr; background: var(--brown-2); border: 1px solid var(--line-inverse); border-top: 0; }
.value-reading > * { min-height: 220px; margin: 0; padding: clamp(1.25rem, 3vw, 2.2rem); }
.value-reading > * + * { border-left: 1px solid var(--line-inverse); }
.value-reading > p { display: grid; align-content: center; color: var(--gold); font: 400 clamp(1.5rem, 3vw, 2.5rem)/1.2 var(--serif); }
.value-reading article { display: flex; flex-direction: column; }
.value-reading article span, .value-reading article small { font: 500 0.66rem/1.4 var(--mono); }
.value-reading article span { color: var(--gold); }
.value-reading article strong { margin: auto 0 0.6rem; font: 400 clamp(2.8rem, 6vw, 5.5rem)/1 var(--serif); }
.value-reading article small { color: rgba(255, 249, 238, 0.58); }

.limits-section { background: var(--paper-2); display: grid; grid-template-columns: 0.65fr 1fr; gap: clamp(2rem, 6vw, 6rem); }
.limits-section ul { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.limits-section li { padding: 1rem 0; border-bottom: 1px solid var(--line); font: 500 0.9rem/1.5 var(--sans); }
.paper-cta { grid-column: 1 / -1; padding: clamp(1.5rem, 4vw, 3rem); display: grid; gap: 0.7rem; background: var(--red); color: var(--white); text-decoration: none; transition: background-color 160ms ease, transform 160ms var(--ease); }
.paper-cta:hover { background: #a91610; }
.paper-cta:active { transform: scale(0.99); }
.paper-cta span, .paper-cta small { font: 500 0.68rem/1.4 var(--mono); text-transform: uppercase; }
.paper-cta strong { font: 400 clamp(2.8rem, 6vw, 5.5rem)/1 var(--serif); }

.site-footer { min-height: 70px; padding: 0 clamp(1.1rem, 4vw, 4rem); display: flex; align-items: center; justify-content: space-between; gap: 1rem; border-top: 1px solid var(--line); font: 500 0.68rem/1 var(--mono); text-transform: uppercase; }
.site-footer p { margin: 0; }
.site-footer a { color: var(--red); }

@media (max-width: 1050px) {
  .journey-rail { grid-template-columns: repeat(3, 1fr); }
  .journey-rail a:nth-child(4) { border-left: 0; }
  .journey-rail a:nth-child(n + 4) { border-top: 1px solid var(--line); }
  .search-controls { grid-template-columns: 1fr 1fr; }
  .channel-group { grid-column: 1 / -1; border-left: 0 !important; border-top: 1px solid var(--line-inverse); }
  .search-stage { grid-template-columns: 1fr; }
  .trajectory-card { border-right: 0; border-bottom: 1px solid var(--line-inverse); }
  .candidate-list { display: grid; grid-template-columns: repeat(5, 1fr); }
  .candidate-list button { min-height: 112px; grid-template-columns: 1fr; align-content: center; }
  .candidate-list button + button { border-left: 1px solid rgba(255, 249, 238, 0.12); }
  .candidate-list button i { margin-top: 0.35rem; }
  .exposure-lanes article { grid-template-columns: 1fr; }
  .exposure-track { grid-column: 1; grid-row: auto; }
  .exposure-lanes article > p { grid-column: 1; }
  .construction-flow { grid-template-columns: repeat(3, 1fr); }
  .construction-flow button:nth-child(3) { border-right: 0; }
  .construction-flow button:nth-child(n + 4) { border-top: 1px solid var(--line-inverse); }
  .mitigation-stage { grid-template-columns: 1fr 1fr; }
  .utility-reading { grid-column: 1 / -1; border-left: 0 !important; border-top: 1px solid var(--line); }
  .utility-reading p { margin: 0; }
  .header-cards { grid-template-columns: repeat(3, 1fr); }
  .header-cards button:nth-child(3) { border-right: 0; }
  .header-cards button:nth-child(n + 4) { border-top: 1px solid var(--line-inverse); }
}

@media (max-width: 760px) {
  .project-nav > span { display: none; }
  .research-brief, .section-intro, .representation-stage, .rebase-workbench, .limits-section { grid-template-columns: 1fr; }
  .research-brief p + p { border-left: 0; border-top: 1px solid var(--line); }
  .reader-hero h1 { font-size: clamp(3.5rem, 18vw, 5.8rem); }
  .section-intro { gap: 1.4rem; }
  .representation-tabs { grid-template-columns: 1fr; }
  .representation-tabs button { border-right: 0; border-bottom: 1px solid var(--line); }
  .representation-tabs button:last-child { border-bottom: 0; }
  .packet-view { min-height: 330px; border-width: 0.75rem; }
  .representation-result { grid-template-columns: 1fr; }
  .representation-result p + p { padding-left: 0; border-left: 0; border-top: 1px solid var(--line-inverse); }
  .search-controls, .search-insight, .scale-controls, .scale-reading, .construction-results, .mitigation-stage, .value-reading { grid-template-columns: 1fr; }
  .control-group + .control-group, .scale-controls > div + div, .scale-reading p + p, .construction-results article + article, .mitigation-stage > * + *, .value-reading > * + * { border-left: 0; border-top: 1px solid var(--line-inverse); }
  .candidate-list { grid-template-columns: 1fr; }
  .candidate-list button { min-height: 74px; grid-template-columns: 2.3rem 1fr auto; }
  .candidate-list button + button { border-left: 0; }
  .search-insight > * + * { border-left: 0; border-top: 1px solid var(--line-inverse); }
  .claim-boundary, .reading-callout, .open-set-callout { grid-template-columns: 1fr; }
  .exposure-lanes article { min-height: 340px; }
  .exposure-track { min-height: 220px; }
  .rebase-case { border-right: 0; border-bottom: 1px solid var(--line-inverse); }
  .channel-bars > div { grid-template-columns: 7rem 1fr 3.3rem; }
  .scale-reading p + p { border-top-color: var(--line); }
  .construction-results article + article { border-top-color: var(--line-inverse); }
  .mitigation-stage { grid-template-columns: 1fr; }
  .utility-reading { grid-column: auto; }
  .mitigation-stage > * + * { border-top-color: var(--line); }
  .collision-visual { min-height: 320px; }
  .header-cards { grid-template-columns: 1fr; }
  .header-cards button, .header-cards button:nth-child(3) { border-right: 0; border-bottom: 1px solid var(--line-inverse); }
  .header-cards button:nth-child(n + 4) { border-top: 0; }
  .header-cards button:last-child { border-bottom: 0; }
  .value-reading > * + * { border-top-color: var(--line-inverse); }
  .paper-cta { grid-column: 1; }
}

@media (max-width: 520px) {
  .journey-rail { grid-template-columns: 1fr 1fr; }
  .journey-rail a:nth-child(odd) { border-left: 0; }
  .journey-rail a:nth-child(even) { border-left: 1px solid var(--line); }
  .journey-rail a:nth-child(n + 3) { border-top: 1px solid var(--line); }
  .control-group { align-items: stretch; }
  .control-group button { flex: 1 1 42%; }
  .trajectory-card canvas, .rebase-case canvas { height: 320px; }
  .construction-flow { grid-template-columns: 1fr 1fr; }
  .construction-flow button { border-right: 1px solid var(--line-inverse) !important; border-top: 1px solid var(--line-inverse); }
  .construction-flow button:nth-child(odd) { border-left: 0; }
  .construction-flow button:nth-child(even) { border-right: 0 !important; }
  .construction-flow button:nth-child(-n + 2) { border-top: 0; }
  .site-footer { padding-block: 1rem; align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition-duration: 0.01ms !important; }
}