:root {
  color-scheme: light;
  --paper: #f2f3f5;
  --paper-strong: #ffffff;
  --ink: #1b2b4e;
  --muted: #71809c;
  --line: #cad5e2;
  --blue: #3fa4ff;
  --blue-soft: #e2f0fc;
  --blue-deep: #d3e9fb;
  --danger-soft: #f7e9e6;
  --max-width: 1240px;
  --gutter: clamp(1.25rem, 5vw, 4.5rem);
  --serif: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --radius: 2px;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --paper: #101928;
  --paper-strong: #17243a;
  --ink: #edf3fb;
  --muted: #9cacc5;
  --line: #34445e;
  --blue: #62b7ff;
  --blue-soft: #1d3854;
  --blue-deep: #203e5d;
  --danger-soft: #442c31;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

section[id] {
  scroll-margin-top: 4.5rem;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 400;
  line-height: 1.45;
  overflow-wrap: anywhere;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::selection {
  background: var(--blue);
  color: #fff;
}

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.75rem;
  left: 0.75rem;
  transform: translateY(-180%);
  padding: 0.6rem 0.8rem;
  background: var(--ink);
  color: var(--paper);
  font-size: 0.8rem;
  text-decoration: none;
}

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

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(var(--max-width), calc(100% - (var(--gutter) * 2)));
  min-height: 5.4rem;
  margin: 0 auto;
  border-bottom: 1px solid var(--line);
}

.brand,
.footer-brand {
  color: var(--ink);
  font-size: 1.65rem;
  font-weight: 400;
  letter-spacing: -0.08em;
  line-height: 1;
  text-decoration: none;
}

.brand span,
.footer-brand span {
  color: var(--blue);
}

.header-meta,
.eyebrow,
.rail-kicker,
.item-date,
.page-number,
.source-link,
.small-note {
  font-family: var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.header-meta {
  display: flex;
  gap: 0.7rem;
  color: var(--muted);
  font-size: 0.68rem;
}

.header-slash {
  color: var(--blue);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 2.5rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.75rem;
}

.theme-toggle:hover {
  border-color: var(--blue);
  color: var(--ink);
}

.theme-icon {
  color: var(--blue);
  font-size: 1rem;
}

.page {
  width: min(var(--max-width), calc(100% - (var(--gutter) * 2)));
  margin: 0 auto;
}

.page-cover {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(20rem, 0.35fr);
  min-height: min(44rem, calc(100svh - 5.4rem));
  border-bottom: 1px solid var(--line);
}

.cover-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(4rem, 10vw, 9rem) 0 clamp(4rem, 8vw, 7rem);
}

.eyebrow {
  margin: 0 0 1.5rem;
  color: var(--blue);
  font-size: 0.73rem;
  line-height: 1.2;
}

.cover-copy h1 {
  max-width: 9ch;
  margin: 0;
  font-size: clamp(5rem, 13vw, 10rem);
  font-weight: 300;
  letter-spacing: -0.085em;
  line-height: 0.82;
}

.cover-lede {
  max-width: 35rem;
  margin: clamp(3rem, 7vw, 5.5rem) 0 0;
  font-size: clamp(1.35rem, 2.5vw, 2.05rem);
  letter-spacing: -0.045em;
  line-height: 1.3;
}

.cover-actions {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 1.25rem 2rem;
  margin-top: 2.25rem;
}

.text-link {
  color: var(--blue);
  font-size: 0.95rem;
  text-decoration: none;
}

.text-link span {
  padding-left: 0.3rem;
}

.text-link:hover {
  color: var(--ink);
}

.cover-note {
  color: var(--muted);
  font-size: 0.85rem;
}

.cover-rail {
  align-self: stretch;
  margin-left: clamp(2rem, 6vw, 5rem);
  padding: clamp(4rem, 10vw, 8rem) clamp(1.25rem, 4vw, 3.5rem) 3rem;
  background: var(--blue-soft);
}

.rail-kicker {
  margin: 0 0 1.3rem;
  color: var(--muted);
  font-size: 0.68rem;
}

.rail-date {
  padding-bottom: 2.25rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 1rem;
}

.rail-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.rail-list li {
  padding: 1.05rem 0 1.1rem;
  border-bottom: 1px solid var(--line);
  font-size: clamp(1.1rem, 1.8vw, 1.55rem);
  letter-spacing: -0.04em;
}

.rail-list .is-active {
  color: var(--blue);
}

.rail-boundary {
  max-width: 18rem;
  margin: 3.25rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.chapter-nav {
  position: sticky;
  z-index: 10;
  top: 0;
  display: flex;
  gap: 1.25rem;
  overflow-x: auto;
  width: 100%;
  padding: 0.8rem max(var(--gutter), calc((100vw - var(--max-width)) / 2));
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 93%, transparent);
  backdrop-filter: blur(10px);
  scrollbar-width: none;
}

.chapter-nav::-webkit-scrollbar {
  display: none;
}

.chapter-nav a {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.77rem;
  text-decoration: none;
  white-space: nowrap;
}

.chapter-nav a:hover,
.chapter-nav a.is-current {
  color: var(--ink);
}

.chapter-nav span {
  margin-right: 0.3rem;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 0.65rem;
}

.content-page,
.split-page,
.landscape-page {
  padding: clamp(5.5rem, 11vw, 10rem) 0;
  border-bottom: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}

.page-number {
  display: inline-block;
  padding-top: 0.35rem;
  color: var(--blue);
  font-size: 0.72rem;
}

.section-heading h2,
.split-copy h2 {
  max-width: 19ch;
  margin: 0;
  font-size: clamp(2.5rem, 5.6vw, 5.55rem);
  font-weight: 300;
  letter-spacing: -0.075em;
  line-height: 0.98;
}

.timeline-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: clamp(4rem, 9vw, 7.5rem);
  border-top: 1px solid var(--line);
}

.timeline-item {
  min-height: 18rem;
  padding: 1.1rem 1.5rem 1.5rem 0;
}

.timeline-item + .timeline-item {
  padding-left: 1.5rem;
  border-left: 1px solid var(--line);
}

.item-date {
  margin: 0 0 2.2rem;
  color: var(--blue);
  font-size: 0.82rem;
}

.timeline-item h3,
.architecture-grid h3,
.proof-list h3,
.cadence-list h3,
.lifecycle-row h3,
.lesson-row h3 {
  margin: 0;
  font-size: clamp(1.2rem, 1.9vw, 1.7rem);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 1.15;
}

.timeline-item p:last-child {
  max-width: 16rem;
  margin: 4rem 0 0;
  color: var(--muted);
  font-size: 1rem;
}

.highlight-band {
  margin: 3rem 0 0;
  padding: 1rem 1.4rem;
  background: var(--blue-soft);
  color: var(--ink);
  font-size: clamp(1rem, 1.8vw, 1.45rem);
  letter-spacing: -0.04em;
}

.split-page {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(20rem, 0.9fr);
  gap: clamp(3rem, 8vw, 8rem);
  align-items: stretch;
}

.split-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.split-copy .page-number {
  margin-bottom: clamp(3rem, 7vw, 6rem);
}

.support-copy {
  max-width: 37rem;
  margin: auto 0 0;
  color: var(--muted);
  font-size: clamp(1.1rem, 2vw, 1.55rem);
  letter-spacing: -0.04em;
}

.blue-panel {
  background: var(--blue-soft);
}

.numbered-list {
  padding: 2rem clamp(1.25rem, 4vw, 3rem);
}

.numbered-row {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  gap: 1.25rem;
  padding: 1.3rem 0 1.5rem;
  border-top: 1px solid var(--line);
}

.numbered-row:first-child {
  border-top: 0;
}

.row-number {
  color: var(--blue);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.numbered-row h3,
.numbered-row p {
  margin: 0;
}

.numbered-row h3 {
  font-size: clamp(1.2rem, 2.1vw, 1.7rem);
  font-weight: 400;
  letter-spacing: -0.04em;
  line-height: 1.15;
}

.numbered-row p {
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.lifecycle-list {
  margin-top: clamp(4rem, 9vw, 7.5rem);
}

.lifecycle-row {
  display: grid;
  grid-template-columns: 4.5rem 15rem minmax(0, 1fr);
  gap: 1rem;
  align-items: baseline;
  padding: 1.4rem 0 1.5rem;
  border-top: 1px solid var(--line);
}

.lifecycle-row p {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

.bottom-statement {
  margin: clamp(3rem, 7vw, 5.5rem) 0 0;
  color: var(--ink);
  font-size: clamp(1.05rem, 2vw, 1.5rem);
  letter-spacing: -0.04em;
}

.architecture-main {
  display: grid;
  grid-template-columns: minmax(13rem, 0.8fr) minmax(0, 1.2fr);
  gap: 2rem;
  align-items: center;
  margin-top: clamp(4rem, 8vw, 7rem);
  padding: 2rem clamp(1.25rem, 3vw, 2.5rem);
  background: var(--blue-soft);
}

.architecture-main p {
  margin: 0;
  font-size: clamp(1.15rem, 2.3vw, 1.75rem);
  letter-spacing: -0.04em;
}

.architecture-label {
  font-size: clamp(1.7rem, 3.2vw, 2.7rem) !important;
  line-height: 1;
}

.architecture-status {
  margin-top: 0.8rem !important;
  color: var(--muted);
  font-size: 0.85rem !important;
}

.architecture-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.architecture-grid article {
  min-height: 9rem;
  padding: 0 1.5rem 1rem 0;
  border-bottom: 1px solid var(--line);
}

.architecture-grid article + article {
  padding-left: 1.5rem;
  border-left: 1px solid var(--line);
}

.architecture-grid p {
  max-width: 23rem;
  margin: 1.8rem 0 0;
  color: var(--muted);
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(3rem, 8vw, 8rem);
  margin-top: clamp(4rem, 8vw, 7rem);
}

.column-title {
  margin: 0 0 1rem;
  font-size: 1.1rem;
  font-weight: 400;
  letter-spacing: -0.03em;
}

.evidence-column + .evidence-column {
  padding-left: clamp(1.5rem, 5vw, 4rem);
  border-left: 1px solid var(--line);
}

.evidence-column:first-child .column-title {
  color: var(--ink);
}

.evidence-column:last-child .column-title {
  color: var(--blue);
}

.evidence-row,
.lesson-row,
.proof-list article,
.cadence-list article {
  display: grid;
  grid-template-columns: 3.25rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.2rem 0 1.3rem;
  border-top: 1px solid var(--line);
}

.evidence-row p {
  max-width: 30rem;
  margin: 0;
  font-size: 1rem;
}

.nous-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(17rem, 0.8fr);
  gap: clamp(3rem, 8vw, 7rem);
  margin-top: clamp(4rem, 8vw, 7rem);
}

.lesson-row {
  grid-template-columns: 3.25rem minmax(10rem, 0.8fr) minmax(0, 1fr);
}

.lesson-row h3,
.lesson-row p {
  margin: 0;
}

.lesson-row p {
  color: var(--muted);
  font-size: 0.98rem;
}

.metric-panel {
  min-height: 22rem;
  padding: 2.2rem 2.2rem 2rem;
  background: var(--blue-soft);
}

.metric-context,
.metric-label,
.metric-date,
.metric-boundary {
  margin: 0;
}

.metric-context {
  color: var(--muted);
  font-size: 0.93rem;
}

.metric-value {
  margin: 2rem 0 0;
  font-size: clamp(5rem, 9vw, 8rem);
  font-weight: 300;
  letter-spacing: -0.1em;
  line-height: 0.8;
}

.metric-label {
  margin-top: 1.35rem;
  font-size: 1.15rem;
}

.metric-rule {
  margin: 2rem 0 1.2rem;
  border-top: 1px solid var(--line);
}

.metric-date,
.metric-boundary {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.metric-boundary {
  margin-top: 0.6rem;
  color: var(--blue);
}

.small-note {
  margin: 1.6rem 0 0;
  color: var(--muted);
  font-size: 0.65rem;
  text-transform: none;
}

.mapping-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(2rem, 8vw, 7rem);
  margin-top: clamp(4rem, 8vw, 7rem);
}

.mapping-column {
  padding-top: 1.15rem;
  border-top: 1px solid var(--line);
}

.mapping-column h3 {
  margin: 0 0 2rem;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 400;
}

.mapping-column p {
  margin: 0;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
  font-size: clamp(1.05rem, 1.8vw, 1.4rem);
  letter-spacing: -0.035em;
}

.accent-column p:last-child {
  color: var(--blue);
}

.landscape-page {
  width: min(var(--max-width), calc(100% - (var(--gutter) * 2)));
}

.section-intro-copy {
  max-width: 52rem;
  margin: 2.5rem 0 0 5rem;
  color: var(--muted);
  font-size: 1rem;
}

.landscape-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(3.5rem, 7vw, 6rem) 0 2.5rem;
  background: var(--line);
  border: 1px solid var(--line);
}

.landscape-summary article {
  min-height: 16rem;
  padding: 1.5rem 1.5rem 1.8rem;
  background: var(--paper-strong);
}

.landscape-summary .summary-lag {
  background: var(--blue-soft);
}

.summary-label {
  margin: 0 0 1.3rem;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
}

.landscape-summary ul {
  margin: 0;
  padding-left: 1.2rem;
}

.landscape-summary li {
  margin: 0.7rem 0;
  color: var(--ink);
  font-size: 0.96rem;
}

.competitor-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.competitor {
  min-width: 0;
  background: var(--paper-strong);
}

.competitor summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 1.3rem;
  list-style: none;
  cursor: pointer;
}

.competitor summary::-webkit-details-marker {
  display: none;
}

.competitor summary::after {
  flex: 0 0 auto;
  color: var(--blue);
  content: "+";
  font-size: 1.2rem;
  font-weight: 300;
}

.competitor[open] summary::after {
  content: "−";
}

.competitor-name {
  font-size: 1.05rem;
  letter-spacing: -0.035em;
}

.competitor-type {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.62rem;
  text-align: right;
}

.competitor-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  padding: 0 1.3rem 1rem;
}

.competitor-grid div {
  min-width: 0;
}

.competitor-grid b {
  display: block;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 400;
  text-transform: uppercase;
}

.competitor-grid p {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.83rem;
}

.source-link {
  display: inline-block;
  margin: 0 1.3rem 1.2rem;
  color: var(--blue);
  font-size: 0.62rem;
  text-decoration: none;
}

.source-link:hover {
  color: var(--ink);
}

.plan-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(3rem, 8vw, 8rem);
  margin-top: clamp(4rem, 8vw, 7rem);
}

.plan-column > h3 {
  margin: 0 0 1rem;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 400;
  text-transform: uppercase;
}

.plan-row,
.target-row {
  display: grid;
  gap: 1rem;
  align-items: baseline;
  padding: 1.2rem 0 1.3rem;
  border-top: 1px solid var(--line);
}

.plan-row {
  grid-template-columns: 3rem minmax(0, 1fr) minmax(8rem, 0.9fr);
}

.target-row {
  grid-template-columns: minmax(0, 1fr) minmax(8rem, 0.9fr);
}

.plan-row h4,
.plan-row p,
.target-row h4,
.target-row p {
  margin: 0;
}

.plan-row h4,
.target-row h4 {
  font-size: 1rem;
  font-weight: 400;
}

.plan-row p,
.target-row p {
  color: var(--muted);
  font-size: 0.87rem;
}

.team-layout {
  display: grid;
  grid-template-columns: minmax(18rem, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(3rem, 9vw, 8rem);
  margin-top: clamp(4rem, 8vw, 7rem);
}

.team-card {
  padding: 1.25rem;
  background: var(--blue-soft);
}

.recognition-figure {
  margin: 0;
  overflow: hidden;
  background: #fff;
}

.recognition-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.recognition-label {
  margin: 1.5rem 0 0;
  color: var(--ink);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 300;
  letter-spacing: -0.08em;
  line-height: 0.9;
}

.recognition-caption,
.team-founder {
  color: var(--muted);
  font-size: 0.9rem;
}

.team-founder {
  margin: 2.5rem 0 0;
  color: var(--ink);
  font-size: 1.3rem;
  letter-spacing: -0.04em;
}

.team-founder span {
  color: var(--muted);
  font-size: 0.9rem;
}

.proof-list article {
  grid-template-columns: 10rem minmax(0, 1fr);
}

.proof-list article h3,
.proof-list article p {
  margin: 0;
}

.proof-list article p {
  color: var(--muted);
  font-size: 0.97rem;
}

.close-page {
  padding-bottom: clamp(4rem, 8vw, 7rem);
}

.cadence-list {
  margin-top: clamp(4rem, 8vw, 7rem);
}

.cadence-list article {
  grid-template-columns: 3.25rem 12rem minmax(0, 1fr);
  align-items: baseline;
}

.cadence-list p {
  margin: 0;
  color: var(--muted);
}

.funding-band {
  display: grid;
  grid-template-columns: minmax(13rem, 0.4fr) minmax(0, 1fr);
  gap: 2rem;
  margin-top: 4rem;
  padding: 1.3rem 1.5rem;
  background: var(--blue-soft);
}

.funding-band p {
  margin: 0;
  font-size: 0.95rem;
}

.funding-band .funding-label {
  color: var(--blue);
  font-family: var(--mono);
  font-size: 0.76rem;
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr 1.5fr auto;
  gap: 2rem;
  align-items: start;
  width: min(var(--max-width), calc(100% - (var(--gutter) * 2)));
  margin: 0 auto;
  padding: 3rem 0 5rem;
}

.site-footer p {
  margin: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.site-footer .footer-boundary {
  max-width: 27rem;
  margin-top: 0.75rem;
  font-family: var(--serif);
  font-size: 0.86rem;
  letter-spacing: -0.02em;
}

.site-footer .text-link {
  justify-self: end;
}

@media (max-width: 900px) {
  :root {
    --gutter: 2.25rem;
  }

  .page-cover,
  .split-page,
  .nous-layout,
  .team-layout {
    grid-template-columns: 1fr;
  }

  .page-cover {
    min-height: auto;
  }

  .cover-rail {
    margin-left: 0;
    padding-top: 2rem;
    padding-bottom: 2.5rem;
  }

  .rail-list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .rail-list li {
    padding-right: 0.75rem;
  }

  .rail-list li + li {
    padding-left: 0.75rem;
    border-left: 1px solid var(--line);
  }

  .rail-boundary {
    max-width: none;
    margin-top: 2rem;
  }

  .split-page {
    gap: 3rem;
  }

  .timeline-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .timeline-item {
    min-height: 16rem;
  }

  .timeline-item:nth-child(3),
  .timeline-item:nth-child(4) {
    border-top: 1px solid var(--line);
  }

  .timeline-item:nth-child(3) {
    padding-left: 0;
    border-left: 0;
  }

  .competitor-list {
    grid-template-columns: 1fr;
  }

  .competitor-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .plan-layout {
    grid-template-columns: 1fr;
  }

  .support-copy {
    margin-top: 3rem;
  }

  .nous-layout,
  .team-layout {
    gap: 3rem;
  }

  .metric-panel {
    min-height: auto;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 1.2rem;
  }

  .site-header {
    min-height: 4.25rem;
  }

  .brand,
  .footer-brand {
    font-size: 1.4rem;
  }

  .header-meta {
    display: none;
  }

  .theme-toggle {
    min-height: 2.75rem;
    padding: 0.35rem 0.55rem;
    font-size: 0.68rem;
  }

  .text-link {
    display: inline-flex;
    align-items: center;
    min-height: 2.75rem;
  }

  .page-cover {
    display: block;
  }

  .cover-copy {
    min-height: 34rem;
    padding: 4.5rem 0 3.5rem;
  }

  .cover-copy h1 {
    font-size: clamp(4.5rem, 25vw, 7.5rem);
  }

  .cover-lede {
    margin-top: 3rem;
    font-size: 1.22rem;
  }

  .cover-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.9rem;
    margin-top: 2rem;
  }

  .cover-note {
    font-size: 0.8rem;
  }

  .cover-rail {
    padding: 1.5rem 1rem 1.75rem;
  }

  .rail-kicker {
    margin-bottom: 0.8rem;
  }

  .rail-date {
    padding-bottom: 1.25rem;
  }

  .rail-list {
    display: block;
  }

  .rail-list li,
  .rail-list li + li {
    padding: 0.7rem 0;
    border-left: 0;
  }

  .rail-boundary {
    margin-top: 1.5rem;
    font-size: 0.77rem;
  }

  .chapter-nav {
    gap: 1rem;
    padding-top: 0.7rem;
    padding-bottom: 0.7rem;
  }

  .chapter-nav a {
    padding: 0.35rem 0;
  }

  .content-page,
  .split-page,
  .landscape-page {
    padding: 4.5rem 0;
  }

  .section-heading {
    grid-template-columns: 2.2rem minmax(0, 1fr);
    gap: 0.75rem;
  }

  .section-heading h2,
  .split-copy h2 {
    max-width: none;
    font-size: clamp(2.45rem, 12vw, 4rem);
    line-height: 0.98;
  }

  .section-heading .eyebrow {
    margin-bottom: 1.1rem;
  }

  .timeline-grid,
  .architecture-grid,
  .evidence-grid,
  .mapping-grid,
  .landscape-summary,
  .competitor-list,
  .plan-layout,
  .site-footer {
    grid-template-columns: 1fr;
  }

  .timeline-grid {
    margin-top: 3.25rem;
  }

  .timeline-item,
  .timeline-item + .timeline-item,
  .timeline-item:nth-child(3),
  .timeline-item:nth-child(4) {
    min-height: auto;
    padding: 1rem 0 1.5rem;
    border-left: 0;
    border-top: 0;
    border-bottom: 1px solid var(--line);
  }

  .timeline-item p:last-child {
    margin-top: 1rem;
  }

  .highlight-band {
    margin-top: 2rem;
    padding: 0.9rem 1rem;
    font-size: 1rem;
  }

  .numbered-list {
    padding: 1rem;
  }

  .numbered-row {
    grid-template-columns: 2.25rem minmax(0, 1fr);
    gap: 0.7rem;
  }

  .lifecycle-list {
    margin-top: 3.25rem;
  }

  .lifecycle-row {
    grid-template-columns: 2.5rem minmax(0, 1fr);
    gap: 0.75rem;
  }

  .lifecycle-row p {
    grid-column: 2;
    font-size: 0.93rem;
  }

  .architecture-main {
    grid-template-columns: 1fr;
    gap: 1.25rem;
    margin-top: 3.25rem;
    padding: 1.25rem;
  }

  .architecture-grid {
    gap: 0;
    margin-top: 1.5rem;
  }

  .architecture-grid article,
  .architecture-grid article + article {
    min-height: auto;
    padding: 1rem 0;
    border-left: 0;
  }

  .architecture-grid p {
    margin-top: 0.8rem;
  }

  .evidence-grid {
    gap: 2.75rem;
    margin-top: 3.25rem;
  }

  .evidence-column + .evidence-column {
    padding-left: 0;
    border-left: 0;
  }

  .evidence-row,
  .lesson-row,
  .proof-list article,
  .cadence-list article {
    grid-template-columns: 2.5rem minmax(0, 1fr);
    gap: 0.75rem;
  }

  .nous-layout,
  .team-layout {
    margin-top: 3.25rem;
  }

  .lesson-row {
    grid-template-columns: 2.5rem minmax(0, 1fr);
  }

  .lesson-row p {
    grid-column: 2;
  }

  .metric-panel {
    padding: 1.5rem;
  }

  .metric-value {
    font-size: 6.5rem;
  }

  .mapping-grid {
    gap: 2.75rem;
    margin-top: 3.25rem;
  }

  .section-intro-copy {
    margin: 1.75rem 0 0 2.95rem;
    font-size: 0.92rem;
  }

  .landscape-summary {
    margin-top: 2.75rem;
  }

  .landscape-summary article {
    min-height: auto;
    padding: 1.2rem;
  }

  .competitor summary {
    align-items: flex-start;
    padding: 1rem;
  }

  .competitor-name {
    max-width: 14rem;
    font-size: 0.98rem;
  }

  .competitor-type {
    display: none;
  }

  .competitor-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 0 1rem 0.8rem;
  }

  .competitor-grid p {
    font-size: 0.86rem;
  }

  .source-link {
    margin: 0 1rem 1rem;
  }

  .plan-layout {
    gap: 2.75rem;
    margin-top: 3.25rem;
  }

  .plan-row {
    grid-template-columns: 2.5rem minmax(0, 1fr);
    gap: 0.75rem;
  }

  .target-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.5rem;
  }

  .plan-row p {
    grid-column: 2;
  }

  .target-row p {
    grid-column: 1;
  }

  .team-card {
    padding: 0.85rem;
  }

  .recognition-label {
    font-size: 2.65rem;
  }

  .proof-list article {
    grid-template-columns: 7rem minmax(0, 1fr);
  }

  .cadence-list {
    margin-top: 3.25rem;
  }

  .cadence-list article {
    grid-template-columns: 2.5rem minmax(0, 1fr);
  }

  .cadence-list article p {
    grid-column: 2;
  }

  .funding-band {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    margin-top: 2.75rem;
    padding: 1.1rem;
  }

  .site-footer {
    gap: 1.5rem;
    padding-top: 2.5rem;
  }

  .site-footer .text-link {
    justify-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}