@font-face {
  font-family: "Archivo";
  src: url("/assets/fonts/archivo-latin.woff2") format("woff2");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

@font-face {
  font-family: "Barlow Condensed";
  src: url("/assets/fonts/barlow-condensed-500-latin.woff2") format("woff2");
  font-style: normal;
  font-weight: 500;
  font-display: swap;
}

@font-face {
  font-family: "Barlow Condensed";
  src: url("/assets/fonts/barlow-condensed-700-latin.woff2") format("woff2");
  font-style: normal;
  font-weight: 700 800;
  font-display: swap;
}

:root {
  --limewash: #f2efe3;
  --paper: #faf8f0;
  --charcoal: #202935;
  --charcoal-soft: #354250;
  --solar: #f4bd35;
  --solar-deep: #be7c00;
  --shadow-blue: #6688a8;
  --blue-deep: #405b74;
  --rule: rgba(32, 41, 53, 0.28);
  --rule-strong: rgba(32, 41, 53, 0.62);
  --page: min(100% - 3rem, 84rem);
  --rail: clamp(6.5rem, 14vw, 12rem);
  --display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --body: "Archivo", Arial, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  background: var(--limewash);
}

body {
  margin: 0;
  min-width: 0;
  background: var(--limewash);
  color: var(--charcoal);
  font-family: var(--body);
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration-color: currentColor;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-thickness: 0.16em;
}

a:focus-visible {
  outline: 3px solid var(--solar);
  outline-offset: 4px;
}

::selection {
  background: var(--solar);
  color: var(--charcoal);
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.7rem 1rem;
  background: var(--charcoal);
  color: var(--paper);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

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

.site-header {
  position: relative;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(10rem, 1fr) minmax(13rem, 1fr) auto;
  align-items: center;
  min-height: 4.75rem;
  padding: 0.65rem max(1.5rem, calc((100vw - 84rem) / 2));
  border-bottom: 1px solid var(--rule-strong);
  background: rgba(242, 239, 227, 0.96);
}

.wordmark {
  width: max-content;
  font-family: var(--display);
  font-size: 1.4rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.wordmark::after {
  content: "";
  display: block;
  width: 2.7rem;
  margin-top: 0.45rem;
  border-bottom: 4px solid var(--solar);
}

.header-thesis {
  margin: 0;
  color: var(--charcoal-soft);
  font-size: 0.77rem;
  letter-spacing: 0.03em;
}

.site-header nav {
  display: flex;
  gap: clamp(0.8rem, 1.8vw, 1.6rem);
}

.site-header nav a {
  position: relative;
  padding-block: 0.55rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.055em;
  text-decoration: none;
  text-transform: uppercase;
}

.site-header nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0.25rem;
  left: 0;
  border-bottom: 2px solid var(--solar-deep);
  transform: scaleX(0);
  transform-origin: left;
}

.site-header nav a:hover::after,
.site-header nav a:focus-visible::after,
.site-header nav a.nav-link--current::after {
  transform: scaleX(1);
}

body:has(main :target) .site-header nav a.nav-link--current::after {
  transform: scaleX(0);
}

body:has(#shift:target) .site-header nav a[href="#shift"]::after,
body:has(#forces:target) .site-header nav a[href="#forces"]::after,
body:has(#bridge:target) .site-header nav a[href="#bridge"]::after,
body:has(#return:target) .site-header nav a[href="#return"]::after,
body:has(#proof:target) .site-header nav a[href="#proof"]::after {
  transform: scaleX(1);
}

h1,
h2,
h3,
h4,
p {
  overflow-wrap: break-word;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--display);
  font-weight: 700;
  line-height: 0.95;
}

h1 {
  max-width: 12ch;
  font-size: clamp(3.5rem, 8vw, 6rem);
  letter-spacing: -0.035em;
}

h2 {
  max-width: 17ch;
  font-size: clamp(2.75rem, 6vw, 5rem);
  letter-spacing: -0.03em;
}

h3 {
  font-size: clamp(1.8rem, 3.4vw, 3rem);
  letter-spacing: -0.02em;
}

.hero {
  position: relative;
  min-height: calc(100svh - 4.75rem);
  overflow: hidden;
  border-bottom: 1px solid var(--rule-strong);
}

.hero-copy {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 6rem);
  min-height: clamp(27rem, 58vh, 38rem);
  padding-block: clamp(3rem, 6vh, 5rem) clamp(2.5rem, 5vh, 4rem);
}

.hero h1 {
  font-size: clamp(3.5rem, 7vw, 5.45rem);
}

.hero-context,
.section-label,
.section-rail p,
.section-rail > span,
.model-label,
.definition-plan article > span {
  margin: 0;
  color: var(--blue-deep);
  font-family: var(--display);
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-context {
  padding-top: 0.7rem;
  border-top: 3px solid var(--shadow-blue);
}

.hero-statement {
  max-width: 69rem;
}

.hero-lead {
  max-width: 55ch;
  margin: 1.65rem 0 2rem;
  color: var(--charcoal-soft);
  font-size: clamp(1.08rem, 1.5vw, 1.3rem);
  line-height: 1.6;
}

.threshold-link {
  display: inline-flex;
  align-items: center;
  gap: 1.5rem;
  min-height: 2.8rem;
  padding: 0.45rem 0;
  border-bottom: 4px solid var(--solar-deep);
  font-family: var(--display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.035em;
  text-decoration: none;
  text-transform: uppercase;
}

.arrow-icon {
  display: inline-block;
  flex: 0 0 1.2rem;
  width: 1.2rem;
  height: 1.2rem;
  background: url("/assets/arrow.svg") center / contain no-repeat;
}

.arrow-icon--down {
  transform: rotate(90deg);
}

.arrow-icon--up-right {
  transform: rotate(-45deg);
}

.horizon {
  position: relative;
  min-height: clamp(20rem, 42vh, 32rem);
  border-top: 1px solid var(--rule-strong);
  background: var(--shadow-blue);
  isolation: isolate;
}

.horizon::before {
  content: "";
  position: absolute;
  z-index: 2;
  inset: 0;
  background: rgba(32, 41, 53, 0.08);
  pointer-events: none;
}

.horizon > picture {
  position: absolute;
  inset: 0;
  display: block;
}

.horizon > picture img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  object-position: center 56%;
}

.horizon-index {
  position: absolute;
  z-index: 4;
  right: max(1.5rem, calc((100vw - 84rem) / 2));
  bottom: 1.35rem;
  left: max(1.5rem, calc((100vw - 84rem) / 2));
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  color: var(--paper);
  font-family: var(--display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-shadow: 0 1px 10px rgba(32, 41, 53, 0.9);
  text-transform: uppercase;
}

.horizon-index span:nth-child(2) {
  text-align: center;
}

.horizon-index span:last-child {
  color: var(--solar);
  text-align: right;
}

.signal-rail {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background: var(--charcoal);
  color: var(--paper);
}

.signal-rail span {
  padding: 1.15rem max(1.5rem, calc((100vw - 84rem) / 6));
  border-right: 1px solid rgba(242, 239, 227, 0.25);
  font-family: var(--display);
  font-size: clamp(0.95rem, 1.7vw, 1.25rem);
  font-weight: 500;
  letter-spacing: 0.025em;
  text-align: center;
  text-transform: uppercase;
}

.signal-rail span:last-child {
  border-right: 0;
  color: var(--solar);
}

.chapter,
.agency-section {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 6rem);
  padding-block: clamp(6rem, 11vw, 10rem);
}

.section-rail {
  align-self: stretch;
  padding-top: 0.7rem;
  border-top: 3px solid var(--shadow-blue);
}

.section-rail > span {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--charcoal);
  font-size: 1.8rem;
}

.section-deck {
  max-width: 48ch;
  margin: 1.2rem 0 0;
  color: var(--blue-deep);
  font-size: 1.08rem;
  font-weight: 600;
}

.old-equation {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: clamp(3rem, 6vw, 5rem) 0 3rem;
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
}

.old-equation div {
  position: relative;
  min-height: 9.5rem;
  padding: 1.15rem;
  border-right: 1px solid var(--rule);
}

.old-equation div:last-child {
  border-right: 0;
}

.old-equation div:not(:last-child)::after {
  content: "";
  position: absolute;
  z-index: 1;
  top: 50%;
  right: -1rem;
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  background: var(--limewash) url("/assets/arrow.svg") center / 1.1rem no-repeat;
  transform: translateY(-50%);
}

.old-equation span,
.phase-plan > li > span,
.return-principles article > span,
.chain span,
.comparison-path span {
  display: block;
  color: var(--blue-deep);
  font-family: var(--display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.old-equation strong {
  display: block;
  margin-top: 2.2rem;
  font-family: var(--display);
  font-size: clamp(1.45rem, 2.5vw, 2.2rem);
  line-height: 1;
}

.two-column-copy {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(2rem, 5vw, 5rem);
  max-width: 72rem;
}

.two-column-copy p,
.section-intro > div > p,
.return-intro,
.proof-copy > div > p,
.closing-statement {
  max-width: 70ch;
}

.chapter-conclusion,
.language-note,
.selection-note,
.compound-statement {
  max-width: 58ch;
  margin: clamp(3rem, 6vw, 5rem) 0 0 auto;
  padding: 1.5rem 0 0 2rem;
  border-top: 4px solid var(--solar-deep);
  border-left: 1px solid var(--rule-strong);
  font-family: var(--display);
  font-size: clamp(1.55rem, 3vw, 2.4rem);
  font-weight: 500;
  line-height: 1.15;
}

.forces-section,
.bridge-section,
.return-section,
.compound-section {
  padding-block: clamp(6rem, 11vw, 10rem);
  border-top: 1px solid var(--rule-strong);
}

.forces-section {
  background: var(--paper);
}

.section-intro,
.question-section,
.proof-copy,
.closing {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 6rem);
}

.section-label {
  align-self: start;
  padding-top: 0.65rem;
  border-top: 3px solid currentColor;
}

.section-intro > div > p,
.proof-copy > div > p {
  margin: 1.5rem 0 0;
  font-size: 1.06rem;
}

.force-stack,
.phase-plan {
  margin-top: clamp(4rem, 8vw, 7rem);
  padding: 0;
  border-top: 1px solid var(--rule-strong);
  list-style: none;
}

.force-stack li,
.phase-plan li {
  display: grid;
  grid-template-columns: 4rem minmax(14rem, 0.9fr) minmax(18rem, 1.45fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: start;
  padding: 2.1rem 0;
  border-bottom: 1px solid var(--rule);
}

.force-number {
  color: var(--solar-deep);
  font-family: var(--display);
  font-size: 1.15rem;
  font-weight: 700;
}

.force-stack h3,
.phase-plan h3 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
}

.force-stack p,
.phase-plan p {
  max-width: 55ch;
  margin: 0.75rem 0 0;
  color: var(--charcoal-soft);
}

.force-stack strong,
.phase-plan strong {
  max-width: 32ch;
  padding-top: 1rem;
  border-top: 4px solid var(--solar);
  font-family: var(--display);
  font-size: clamp(1.25rem, 2vw, 1.65rem);
  font-weight: 500;
  line-height: 1.25;
}

.source-note {
  margin-top: 2rem;
  color: var(--charcoal-soft);
  font-size: 0.76rem;
}

.question-section {
  position: relative;
  width: 100%;
  align-items: start;
  padding-inline: max(1.5rem, calc((100vw - 84rem) / 2));
  padding-block: clamp(6rem, 11vw, 10rem);
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  background: var(--solar);
}

.question-section .section-label {
  color: var(--charcoal);
}

.question-section h2 {
  max-width: 21ch;
}

.question-section div > p {
  margin: 2rem 0 0;
  font-family: var(--display);
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  font-weight: 700;
}

.bridge-section {
  position: relative;
  background-color: var(--limewash);
  background-image: linear-gradient(var(--rule) 1px, transparent 1px), linear-gradient(90deg, var(--rule) 1px, transparent 1px);
  background-size: clamp(3rem, 8vw, 7rem) clamp(3rem, 8vw, 7rem);
  background-position: center;
}

.bridge-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(242, 239, 227, 0.91);
  pointer-events: none;
}

.bridge-section > * {
  position: relative;
}

.phase-plan li {
  grid-template-columns: 7rem minmax(18rem, 1.35fr) minmax(14rem, 0.8fr);
}

.distinction {
  margin-top: clamp(6rem, 10vw, 9rem);
  border-top: 8px solid var(--charcoal);
}

.distinction-heading {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 6rem);
  padding-block: 2rem clamp(3rem, 6vw, 5rem);
}

.distinction-heading h3 {
  max-width: 22ch;
  font-size: clamp(2.2rem, 5vw, 4rem);
}

.model-comparison {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
}

.model-comparison article {
  padding: clamp(2rem, 5vw, 4rem);
}

.model-comparison article + article {
  border-left: 1px solid var(--rule-strong);
  background: var(--charcoal);
  color: var(--paper);
}

.model-comparison article + article .model-label,
.model-comparison article + article .comparison-path span {
  color: var(--solar);
}

.model-comparison h4 {
  margin-top: 0.8rem;
  font-size: clamp(2rem, 4vw, 3.5rem);
}

.model-comparison article > p:last-child {
  max-width: 50ch;
  margin: 2rem 0 0;
}

.comparison-path {
  margin: 2.5rem 0 0;
  padding: 0;
  border-top: 1px solid currentColor;
  list-style: none;
}

.comparison-path li {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid currentColor;
}

.selection-note {
  max-width: 48ch;
}

.agency-section {
  width: 100%;
  padding-inline: max(1.5rem, calc((100vw - 84rem) / 2));
  background: var(--shadow-blue);
  color: var(--paper);
}

.agency-section .section-rail {
  border-color: var(--solar);
}

.agency-section .section-rail > span,
.agency-section .section-rail p,
.agency-section .section-deck,
.agency-section .definition-plan article > span {
  color: var(--paper);
}

.definition-plan {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(3rem, 6vw, 5rem);
  border-top: 1px solid rgba(250, 248, 240, 0.75);
  border-bottom: 1px solid rgba(250, 248, 240, 0.75);
}

.definition-plan article {
  padding: 2rem 2rem 2.5rem 0;
}

.definition-plan article + article {
  padding-left: 2rem;
  border-left: 1px solid rgba(250, 248, 240, 0.5);
}

.definition-plan h3 {
  margin-top: 0.8rem;
}

.definition-plan p {
  max-width: 48ch;
  margin-bottom: 0;
}

.agency-section .language-note {
  border-color: var(--solar);
}

.return-principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: clamp(4rem, 8vw, 7rem);
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
}

.return-principles article {
  min-height: 22rem;
  padding: 1.5rem clamp(1.3rem, 3vw, 2.6rem) 2rem;
  border-right: 1px solid var(--rule);
}

.return-principles article:last-child {
  border-right: 0;
}

.return-principles h3 {
  max-width: 10ch;
  margin-top: 4rem;
}

.return-principles p {
  max-width: 38ch;
}

.return-call {
  margin-top: clamp(4rem, 8vw, 7rem);
  font-family: var(--display);
  font-size: clamp(2.6rem, 7vw, 5.8rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.03em;
}

.compound-section {
  background: var(--charcoal);
  color: var(--paper);
}

.compound-section .section-label {
  color: var(--solar);
}

.compound-section .section-intro > div > p {
  color: #d6dce2;
}

.chain {
  display: grid;
  grid-template-columns: repeat(7, minmax(8rem, 1fr));
  margin-top: clamp(4rem, 8vw, 7rem);
  padding: 0;
  overflow: hidden;
  border-top: 1px solid rgba(250, 248, 240, 0.5);
  border-bottom: 1px solid rgba(250, 248, 240, 0.5);
  list-style: none;
}

.chain li {
  position: relative;
  min-height: 13rem;
  padding: 1.2rem 1rem;
  border-right: 1px solid rgba(250, 248, 240, 0.25);
}

.chain li:last-child {
  border-right: 0;
  color: var(--solar);
}

.chain li:not(:last-child)::after {
  content: "";
  position: absolute;
  z-index: 1;
  top: 50%;
  right: -0.75rem;
  width: 1.5rem;
  background: var(--charcoal) url("/assets/arrow.svg") center / 1rem no-repeat;
}

.chain span {
  color: var(--solar);
}

.chain strong {
  display: block;
  margin-top: 3.2rem;
  font-family: var(--display);
  font-size: 1.25rem;
  line-height: 1.15;
}

.compound-statement {
  color: var(--paper);
  border-color: var(--solar);
}

.proof-section {
  position: relative;
  overflow: hidden;
  padding-block: clamp(6rem, 11vw, 10rem);
  background: #315f4b;
  color: var(--paper);
}

.proof-field {
  position: absolute;
  inset: 0 0 0 50%;
  display: grid;
  align-items: center;
  overflow: hidden;
  opacity: 0.16;
}

.proof-field img {
  width: 120%;
  max-width: none;
  transform: translateX(-6%);
}

.proof-copy {
  position: relative;
  z-index: 1;
}

.proof-copy .section-label {
  color: var(--solar);
}

.proof-copy > div > p {
  max-width: 57ch;
}

.threshold-link--light {
  margin-top: 1rem;
  border-color: var(--solar);
  color: var(--paper);
}

.closing {
  padding-block: clamp(6rem, 11vw, 10rem);
}

.closing h2 {
  max-width: 20ch;
}

.closing-statement {
  margin: 2rem 0;
  color: var(--charcoal-soft);
  font-size: 1.1rem;
}

.site-footer {
  display: grid;
  grid-template-columns: 1.1fr 1fr auto;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
  padding-block: 3rem 2rem;
  border-top: 8px solid var(--charcoal);
}

.not-found {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: start;
  min-height: 66vh;
  padding-block: clamp(5rem, 12vw, 10rem);
}

.not-found .error-code {
  margin: 0;
  padding-top: 0.7rem;
  border-top: 3px solid var(--shadow-blue);
  color: var(--blue-deep);
  font-family: var(--display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.not-found h1 {
  max-width: 12ch;
}

.not-found div > p {
  max-width: 46ch;
  margin: 1.5rem 0 2rem;
  color: var(--charcoal-soft);
  font-size: 1.06rem;
}

.footer-statement p,
.legal-note {
  max-width: 46ch;
  margin: 1.5rem 0 0;
  color: var(--charcoal-soft);
  font-size: 0.78rem;
  line-height: 1.65;
}

.legal-note {
  margin: 0;
}

.operator-lockup {
  display: grid;
  justify-items: end;
  gap: 0.55rem;
  color: var(--charcoal-soft);
  font-size: 0.68rem;
  line-height: 1.2;
  text-decoration: none;
}

.operator-lockup:hover {
  color: var(--charcoal);
}

.brand-mark {
  display: inline-flex;
  gap: 0.2em;
  align-items: baseline;
  font-family: var(--display);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0;
}

.brand-mark > span:first-child {
  color: #26714b;
  font-size: 1.25em;
}

@media (max-width: 70rem) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .header-thesis {
    display: none;
  }

  .force-stack li,
  .phase-plan li {
    grid-template-columns: 3rem minmax(0, 1fr);
  }

  .force-stack strong,
  .phase-plan strong {
    grid-column: 2;
    max-width: 45ch;
  }

  .chain {
    grid-template-columns: repeat(4, 1fr);
  }

  .chain li {
    border-bottom: 1px solid rgba(250, 248, 240, 0.25);
  }

  .site-footer {
    grid-template-columns: 1fr 1fr;
  }

  .operator-lockup {
    grid-column: 2;
  }
}

@media (max-width: 52rem) {
  :root {
    --page: min(100% - 2rem, 84rem);
  }

  .site-header {
    display: block;
    padding: 1.1rem 1rem 0;
  }

  .site-header nav {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
    width: calc(100% + 2rem);
    margin: 1rem -1rem 0;
    padding: 0;
    overflow: visible;
    border-top: 1px solid var(--rule);
    scrollbar-width: none;
  }

  .site-header nav::-webkit-scrollbar {
    display: none;
  }

  .site-header nav a {
    display: grid;
    min-width: 0;
    min-height: 3.35rem;
    padding: 0.65rem 0.1rem;
    place-items: center;
    border-left: 1px solid var(--rule);
    font-size: clamp(0.55rem, 1.8vw, 0.68rem);
    line-height: 1.05;
    letter-spacing: 0.018em;
    text-align: center;
  }

  .site-header nav a:first-child {
    border-left: 0;
  }

  .hero {
    min-height: 0;
  }

  .hero-copy {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .chapter,
  .agency-section,
  .section-intro,
  .question-section,
  .proof-copy,
  .closing,
  .distinction-heading {
    grid-template-columns: 2.35rem minmax(0, 1fr);
    gap: 1.25rem;
  }

  .chapter-body,
  .section-intro > div,
  .question-section > div,
  .proof-copy > div,
  .closing > div,
  .distinction-heading > h3 {
    grid-column: 2;
  }

  .not-found {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-copy {
    min-height: 34rem;
    padding-block: 3rem;
  }

  .hero-context {
    width: min(12rem, 48vw);
  }

  .section-label {
    grid-column: 1;
    grid-row: 1;
    align-self: stretch;
    width: auto;
    min-height: 8rem;
    padding: 0.5rem 0 0 0.55rem;
    border-top: 0;
    border-left: 3px solid currentColor;
    writing-mode: vertical-rl;
    text-orientation: mixed;
  }

  .section-rail {
    grid-column: 1;
    grid-row: 1;
    display: flex;
    width: auto;
    min-width: 0;
    padding: 0.5rem 0 0 0.45rem;
    border-top: 0;
    border-left: 3px solid var(--shadow-blue);
    flex-direction: column;
    align-items: center;
    gap: 0.85rem;
  }

  .section-rail > span {
    margin: 0;
    font-size: 1.15rem;
  }

  .section-rail p {
    writing-mode: vertical-rl;
    text-orientation: mixed;
  }

  .hero-context {
    order: 2;
    align-self: end;
  }

  .hero-statement {
    order: 1;
  }

  h1 {
    font-size: clamp(3.2rem, 15.4vw, 5.2rem);
  }

  .horizon {
    min-height: 0;
    aspect-ratio: 880 / 1787;
  }

  .horizon > picture,
  .horizon > picture img {
    position: static;
    width: 100%;
    height: auto;
    object-fit: contain;
    object-position: center;
  }

  .horizon-index {
    display: none;
  }

  .signal-rail {
    grid-template-columns: 1fr;
  }

  .signal-rail span {
    padding: 0.9rem 1rem;
    border-right: 0;
    border-bottom: 1px solid rgba(242, 239, 227, 0.25);
  }

  .old-equation,
  .model-comparison,
  .definition-plan,
  .return-principles {
    grid-template-columns: 1fr;
  }

  .old-equation div,
  .return-principles article {
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }

  .old-equation div:last-child,
  .return-principles article:last-child {
    border-bottom: 0;
  }

  .old-equation div:not(:last-child)::after {
    top: auto;
    right: 50%;
    bottom: -1rem;
    transform: translateX(50%) rotate(90deg);
  }

  .two-column-copy {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .force-stack li,
  .phase-plan li {
    grid-template-columns: 2.2rem minmax(0, 1fr);
    gap: 1rem;
  }

  .force-stack strong,
  .phase-plan strong {
    grid-column: 2;
  }

  .model-comparison article + article {
    border-top: 1px solid var(--rule-strong);
    border-left: 0;
  }

  .definition-plan article + article {
    padding-left: 0;
    border-top: 1px solid rgba(250, 248, 240, 0.5);
    border-left: 0;
  }

  .return-principles article {
    min-height: 0;
  }

  .return-principles h3 {
    margin-top: 2rem;
  }

  .chain {
    grid-template-columns: repeat(2, 1fr);
  }

  .proof-field {
    inset: 45% 0 0 15%;
  }

  .site-footer {
    grid-template-columns: 1fr;
  }

  .operator-lockup {
    grid-column: 1;
    justify-items: start;
    padding-top: 1.5rem;
    border-top: 1px solid var(--rule);
  }
}

@media (max-width: 29rem) {
  .site-header nav {
    gap: 0;
  }

  .hero-copy {
    min-height: 31rem;
  }

  .hero-lead {
    font-size: 1rem;
  }

  .horizon-index {
    grid-template-columns: 1fr auto;
  }

  .horizon-index span:nth-child(2) {
    display: none;
  }

  .chapter,
  .agency-section,
  .forces-section,
  .bridge-section,
  .return-section,
  .compound-section,
  .proof-section,
  .closing,
  .question-section {
    padding-block: 4.5rem;
  }

  .force-stack li,
  .phase-plan li {
    grid-template-columns: 1fr;
  }

  .force-stack strong,
  .phase-plan strong {
    grid-column: 1;
  }

  .chain {
    grid-template-columns: 1fr;
  }

  .chain li {
    min-height: 8rem;
  }

  .chain strong {
    margin-top: 1.5rem;
  }

  .chain li:not(:last-child)::after {
    top: auto;
    right: 1rem;
    bottom: -0.8rem;
    transform: rotate(90deg);
  }
}

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

@media (prefers-contrast: more) {
  :root {
    --rule: rgba(32, 41, 53, 0.58);
    --rule-strong: #202935;
  }

  a:focus-visible {
    outline-width: 4px;
  }
}

@media print {
  .site-header nav,
  .skip-link,
  .threshold-link {
    display: none;
  }

  .hero,
  .chapter,
  .agency-section,
  .forces-section,
  .bridge-section,
  .return-section,
  .compound-section,
  .proof-section,
  .closing {
    min-height: 0;
    padding-block: 2rem;
    break-inside: avoid;
  }
}