:root {
  --graphite: #141414;
  --graphite-2: #232323;
  --steel: #73777b;
  --steel-2: #a8adb2;
  --paper: #f6f3ed;
  --white: #fffdf8;
  --line: rgba(20, 20, 20, 0.13);
  --line-dark: rgba(255, 253, 248, 0.14);
  --amber: #c9852b;
  --amber-2: #e0ad63;
  --blue: #47728e;
  --shadow: 0 30px 90px rgba(0, 0, 0, 0.34);
  --mono: "IBM Plex Mono", "JetBrains Mono", monospace;
  --sans: "Inter", "IBM Plex Sans", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--graphite);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  letter-spacing: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-shell {
  min-height: 100vh;
  background:
    linear-gradient(90deg, rgba(20, 20, 20, 0.026) 1px, transparent 1px),
    linear-gradient(rgba(20, 20, 20, 0.022) 1px, transparent 1px),
    var(--paper);
  background-size: 112px 112px;
}

.site-header {
  align-items: center;
  backdrop-filter: blur(18px);
  background: rgba(17, 17, 17, 0.88);
  border-bottom: 1px solid var(--line-dark);
  color: var(--white);
  display: flex;
  gap: 28px;
  justify-content: space-between;
  left: 0;
  min-height: 76px;
  padding: 14px clamp(18px, 4vw, 56px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand {
  align-items: center;
  display: inline-flex;
  gap: 14px;
  min-width: 240px;
}

.brand-mark {
  background:
    linear-gradient(90deg, transparent 46%, var(--amber) 46% 54%, transparent 54%),
    linear-gradient(0deg, transparent 46%, var(--amber) 46% 54%, transparent 54%),
    #0f0f0f;
  border: 1px solid rgba(255, 253, 248, 0.22);
  display: block;
  height: 34px;
  width: 34px;
}

.brand-kicker,
.mono-label,
.eyebrow,
.meta,
.tag,
.crumbs,
.chapter-index {
  font-family: var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.brand-kicker {
  color: var(--steel);
  display: block;
  font-size: 10px;
  font-weight: 600;
}

.brand-title {
  display: block;
  font-size: 14px;
  font-weight: 800;
  line-height: 1.25;
  max-width: 220px;
}

.main-nav {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.main-nav a,
.button,
.quiet-link {
  align-items: center;
  border: 1px solid var(--line);
  display: inline-flex;
  font-size: 13px;
  font-weight: 700;
  justify-content: center;
  min-height: 40px;
  padding: 10px 14px;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.main-nav a {
  border-color: var(--line-dark);
  color: rgba(255, 253, 248, 0.78);
}

.main-nav a:hover,
.quiet-link:hover {
  background: var(--white);
  border-color: var(--white);
  color: var(--graphite);
}

.quiet-link:hover {
  background: var(--graphite);
  border-color: var(--graphite);
  color: var(--white);
}

main {
  min-height: calc(100vh - 180px);
}

.section {
  padding: clamp(54px, 8vw, 110px) clamp(18px, 4vw, 56px);
}

.section.dark {
  background:
    linear-gradient(90deg, rgba(255, 253, 248, 0.055) 1px, transparent 1px),
    linear-gradient(rgba(255, 253, 248, 0.045) 1px, transparent 1px),
    var(--graphite);
  background-size: 88px 88px;
  color: var(--white);
}

.hero {
  background:
    linear-gradient(90deg, rgba(255, 253, 248, 0.052) 1px, transparent 1px),
    linear-gradient(rgba(255, 253, 248, 0.045) 1px, transparent 1px),
    var(--graphite);
  background-size: 96px 96px, 96px 96px, auto;
  color: var(--white);
  display: grid;
  gap: clamp(34px, 5vw, 72px);
  grid-template-columns: minmax(0, 1.02fr) minmax(360px, 0.98fr);
  min-height: 0;
  overflow: hidden;
  padding-bottom: 40px;
  padding-top: 44px;
  position: relative;
}

.hero::after {
  bottom: clamp(14px, 3vw, 32px);
  color: rgba(255, 253, 248, 0.055);
  content: "BOOK";
  font-family: var(--mono);
  font-size: 168px;
  font-weight: 600;
  left: clamp(18px, 4vw, 56px);
  line-height: 0.78;
  pointer-events: none;
  position: absolute;
  z-index: 0;
}

.poster-hero {
  --mx: 0;
  --my: 0;
  background:
    linear-gradient(90deg, rgba(20, 20, 20, 0.12) 1px, transparent 1px),
    linear-gradient(rgba(20, 20, 20, 0.1) 1px, transparent 1px),
    var(--amber);
  background-size: 96px 96px, 96px 96px, auto;
  color: #070707;
  min-height: calc(100vh - 76px);
  padding-top: 90px;
}

.poster-hero::after {
  color: rgba(20, 20, 20, 0.07);
  content: "ARCHITECTURE";
  font-size: 96px;
  left: auto;
  right: clamp(18px, 4vw, 56px);
}

.kinetic-strip {
  background: #070707;
  border-bottom: 1px solid rgba(255, 253, 248, 0.16);
  border-top: 1px solid rgba(255, 253, 248, 0.16);
  color: rgba(255, 253, 248, 0.82);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  left: 0;
  letter-spacing: 0.42em;
  overflow: hidden;
  padding: 12px 0;
  position: absolute;
  right: 0;
  top: 0;
  white-space: nowrap;
  z-index: 3;
}

.kinetic-track {
  animation: ticker 26s linear infinite;
  display: inline-flex;
  gap: 52px;
  min-width: max-content;
  padding-left: 24px;
}

.poster-word {
  animation: posterDrift 16s ease-in-out infinite alternate;
  bottom: 20px;
  color: rgba(0, 0, 0, 0.16);
  font-family: var(--sans);
  font-size: 186px;
  font-weight: 800;
  left: -10px;
  line-height: 0.78;
  pointer-events: none;
  position: absolute;
  transform: translate3d(calc(var(--mx) * -8px), calc(var(--my) * -4px), 0);
  white-space: nowrap;
  z-index: 0;
}

.poster-hero .eyebrow {
  color: #070707;
}

.poster-hero .lead {
  color: rgba(7, 7, 7, 0.76);
  font-weight: 600;
  max-width: 660px;
}

.poster-hero h1 {
  color: #070707;
  font-size: clamp(58px, 6vw, 84px);
  text-shadow: 0 1px 0 rgba(255, 253, 248, 0.16);
}

.poster-hero .button {
  background: rgba(255, 253, 248, 0.86);
  border-color: rgba(255, 253, 248, 0.86);
  color: #070707;
}

.poster-hero .button.primary {
  background: #070707;
  border-color: #070707;
  color: var(--white);
}

.poster-hero .button.amber {
  background: var(--white);
  border-color: var(--white);
  color: #070707;
}

.poster-hero .read-next-hint {
  border-color: rgba(7, 7, 7, 0.22);
}

.poster-hero .metric span {
  color: rgba(7, 7, 7, 0.62);
}

.poster-hero .hero-visual {
  transform:
    translate3d(calc(var(--mx) * 12px), calc(var(--my) * 10px), 0)
    rotate(calc(var(--mx) * 1.4deg));
  transition: transform 120ms ease-out;
}

.poster-hero .hero-visual img {
  border: 1px solid rgba(255, 253, 248, 0.56);
  box-shadow: 0 42px 120px rgba(0, 0, 0, 0.42);
  max-height: min(72vh, 690px);
}

.book-cover-study {
  aspect-ratio: 0.72;
  background:
    linear-gradient(90deg, rgba(255, 253, 248, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(255, 253, 248, 0.07) 1px, transparent 1px),
    #101214;
  background-size: 36px 36px;
  border: 1px solid rgba(255, 253, 248, 0.56);
  box-shadow: 0 42px 120px rgba(0, 0, 0, 0.42);
  color: var(--white);
  display: flex;
  flex-direction: column;
  max-height: min(72vh, 690px);
  max-width: min(100%, 500px);
  overflow: hidden;
  padding: 34px 32px;
  position: relative;
  width: 500px;
}

.book-cover-study::before {
  background: linear-gradient(180deg, rgba(255, 253, 248, 0.4), rgba(255, 253, 248, 0));
  content: "";
  height: 100%;
  left: 24px;
  opacity: 0.5;
  position: absolute;
  top: 0;
  width: 1px;
}

.book-cover-study::after {
  border: 1px solid rgba(201, 133, 43, 0.68);
  bottom: 28%;
  content: "";
  height: 150px;
  left: 50%;
  opacity: 0.65;
  position: absolute;
  transform: translateX(-50%);
  width: 220px;
}

.cover-grid {
  border: 1px solid rgba(255, 253, 248, 0.14);
  bottom: 80px;
  left: 32px;
  opacity: 0.55;
  position: absolute;
  right: 32px;
  top: 32px;
}

.cover-topline,
.cover-diagnostic,
.cover-author {
  font-family: var(--mono);
  letter-spacing: 0.12em;
  position: relative;
  text-transform: uppercase;
  z-index: 1;
}

.cover-topline {
  color: var(--amber-2);
  font-size: 11px;
  margin-bottom: 24px;
}

.cover-title {
  font-size: 49px;
  font-weight: 800;
  letter-spacing: 0;
  line-height: 0.92;
  max-width: 360px;
  position: relative;
  z-index: 1;
}

.cover-subtitle {
  color: rgba(255, 253, 248, 0.68);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
  margin-top: 18px;
  max-width: 320px;
  position: relative;
  z-index: 1;
}

.cover-system {
  display: grid;
  gap: 8px;
  margin-left: auto;
  margin-top: auto;
  position: relative;
  width: 210px;
  z-index: 1;
}

.cover-system span {
  align-items: center;
  border-bottom: 1px solid rgba(255, 253, 248, 0.15);
  color: rgba(255, 253, 248, 0.68);
  display: grid;
  font-family: var(--mono);
  font-size: 10px;
  gap: 8px;
  grid-template-columns: 24px minmax(0, 1fr);
  min-height: 20px;
}

.cover-system b {
  color: var(--amber-2);
  font-weight: 600;
}

.cover-diagnostic {
  border: 1px solid rgba(201, 133, 43, 0.55);
  color: var(--amber-2);
  font-size: 10px;
  margin-top: 28px;
  padding: 10px 12px;
  width: fit-content;
  z-index: 1;
}

.cover-author {
  color: rgba(255, 253, 248, 0.7);
  font-size: 11px;
  margin-top: 18px;
}

.poster-note {
  background: rgba(7, 7, 7, 0.92);
  bottom: 24px;
  color: var(--white);
  font-family: var(--mono);
  left: 50%;
  min-width: 280px;
  padding: 14px 16px;
  position: absolute;
  transform: translateX(-50%);
  z-index: 2;
}

.poster-note span {
  color: var(--amber-2);
  display: block;
  font-size: 10px;
  letter-spacing: 0.18em;
  margin-bottom: 4px;
}

.poster-note strong {
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

@keyframes ticker {
  from {
    transform: translateX(0);
  }

  to {
    transform: translateX(-50%);
  }
}

@keyframes posterDrift {
  from {
    letter-spacing: 0;
  }

  to {
    letter-spacing: 0.018em;
  }
}

.hero-copy {
  align-self: center;
  max-width: 760px;
  position: relative;
  z-index: 1;
}

.eyebrow {
  color: var(--amber);
  font-size: 12px;
  font-weight: 700;
  margin: 0 0 18px;
}

h1,
h2,
h3 {
  letter-spacing: 0;
  line-height: 1.02;
  margin: 0;
}

h1 {
  font-size: 66px;
  font-weight: 700;
  max-width: 920px;
}

h2 {
  font-size: 56px;
  font-weight: 700;
}

.hero h1 {
  font-size: 78px;
}

h3 {
  font-size: 30px;
}

.lead {
  color: #414141;
  font-size: 20px;
  margin: 22px 0 0;
  max-width: 690px;
}

.hero .lead {
  color: rgba(255, 253, 248, 0.72);
  max-width: 740px;
}

.poster-hero .lead {
  color: rgba(7, 7, 7, 0.76);
  font-weight: 600;
  max-width: 660px;
}

.dark .lead,
.dark .muted {
  color: rgba(255, 253, 248, 0.74);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.button {
  background: transparent;
  color: var(--graphite);
  min-width: 124px;
}

.hero .button {
  border-color: var(--line-dark);
  color: var(--white);
}

.poster-hero .button {
  background: rgba(7, 7, 7, 0.06);
  border-color: rgba(7, 7, 7, 0.22);
  color: #070707;
}

.button.primary {
  background: var(--graphite);
  border-color: var(--graphite);
  color: var(--white);
}

.hero .button.primary {
  background: var(--white);
  border-color: var(--white);
  color: var(--graphite);
}

.poster-hero .button.primary {
  background: #070707;
  border-color: #070707;
  color: var(--white);
}

.button.amber {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--graphite);
}

.poster-hero .button.amber {
  background: var(--white);
  border-color: var(--white);
  color: #070707;
}

.button:hover {
  transform: translateY(-1px);
}

.hero-visual {
  align-self: center;
  display: flex;
  justify-content: center;
  min-height: 0;
  position: relative;
  z-index: 1;
}

.hero-visual img {
  box-shadow: var(--shadow);
  display: block;
  height: auto;
  max-height: min(70vh, 680px);
  max-width: min(100%, 520px);
  object-fit: contain;
  width: auto;
}

.read-next-hint {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 22px;
  padding-top: 16px;
}

.metric {
  border-left: 1px solid var(--amber);
  padding-left: 12px;
}

.metric strong {
  display: block;
  font-family: var(--mono);
  font-size: 19px;
}

.metric span {
  color: var(--steel);
  display: block;
  font-size: 13px;
  margin-top: 2px;
}

.hero .metric span {
  color: rgba(255, 253, 248, 0.56);
}

.grid {
  display: grid;
  gap: 14px;
}

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

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

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

.panel,
.card,
.chapter-card,
.tool-card {
  background: rgba(255, 253, 248, 0.72);
  border: 1px solid var(--line);
}

.panel {
  padding: clamp(24px, 4vw, 40px);
}

.card,
.chapter-card,
.tool-card {
  min-height: 100%;
  padding: 24px;
  transition: background 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.card:hover,
.chapter-card:hover,
.tool-card:hover {
  background: var(--white);
  border-color: rgba(20, 20, 20, 0.28);
  transform: translateY(-1px);
}

.card.dark-card,
.dark .card,
.dark .panel {
  background: rgba(255, 253, 248, 0.035);
  border-color: var(--line-dark);
}

.card h3,
.chapter-card h3,
.tool-card h3 {
  font-size: 22px;
  line-height: 1.18;
}

.muted {
  color: #5d6266;
}

.meta {
  color: var(--steel);
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 14px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.tag {
  border: 1px solid var(--line);
  color: #4b4f52;
  font-size: 10px;
  font-weight: 700;
  padding: 6px 8px;
}

.dark .tag {
  border-color: var(--line-dark);
  color: rgba(255, 253, 248, 0.72);
}

.page-head {
  background: var(--white);
  border-bottom: 1px solid var(--line);
  padding: clamp(54px, 8vw, 104px) clamp(18px, 4vw, 56px) clamp(30px, 5vw, 62px);
}

.page-head .lead {
  max-width: 850px;
}

.content-band {
  padding: clamp(34px, 5vw, 72px) clamp(18px, 4vw, 56px);
}

.split {
  display: grid;
  gap: clamp(24px, 5vw, 60px);
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
}

.toc-list {
  border-top: 1px solid var(--line);
  margin-top: 28px;
}

.toc-row {
  align-items: center;
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 18px;
  grid-template-columns: 88px minmax(0, 1fr) auto;
  padding: 18px 0;
  transition: background 180ms ease, padding 180ms ease;
}

.toc-row:hover {
  background: rgba(255, 253, 248, 0.74);
  padding-left: 12px;
  padding-right: 12px;
}

.chapter-index {
  color: var(--amber);
  font-size: 12px;
  font-weight: 700;
}

.toc-row strong {
  display: block;
  font-size: 18px;
}

.toc-row span {
  color: var(--steel);
  display: block;
  font-size: 14px;
  margin-top: 2px;
}

.tool-card {
  display: flex;
  flex-direction: column;
}

.tool-card .quiet-link {
  margin-top: auto;
  width: fit-content;
}

.diagnostic-strip {
  border-bottom: 1px solid var(--line);
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 34px;
  padding: 16px 0;
}

.diagnostic-strip span {
  background: rgba(20, 20, 20, 0.06);
  color: #3f4347;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  padding: 7px 9px;
}

.architecture-section {
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.ecosystem-section {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.welcome-section {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.welcome-actions {
  border-top: 1px solid var(--line);
}

.welcome-action {
  align-items: center;
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 20px;
  grid-template-columns: 52px 190px minmax(0, 1fr) auto;
  min-height: 108px;
  padding: 24px 0;
  transition: background 180ms ease, color 180ms ease, padding 180ms ease;
}

.welcome-action span {
  color: var(--amber);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
}

.welcome-action strong {
  font-size: 26px;
  line-height: 1.05;
}

.welcome-action em {
  color: #55595d;
  font-style: normal;
  max-width: 620px;
}

.welcome-action b {
  border: 1px solid var(--line);
  font-size: 13px;
  font-weight: 700;
  min-width: 96px;
  padding: 10px 12px;
  text-align: center;
}

.welcome-action:hover {
  background: var(--graphite);
  color: var(--white);
  padding-left: 18px;
  padding-right: 18px;
}

.welcome-action:hover em {
  color: rgba(255, 253, 248, 0.72);
}

.welcome-action:hover b {
  border-color: rgba(255, 253, 248, 0.28);
}

.ecosystem-list {
  border-top: 1px solid var(--line);
}

.ecosystem-row {
  align-items: baseline;
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 22px;
  grid-template-columns: 52px 150px minmax(0, 1fr);
  padding: 24px 0;
  transition: background 180ms ease, color 180ms ease, padding 180ms ease;
}

.ecosystem-row span {
  color: var(--amber);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
}

.ecosystem-row strong {
  font-size: 34px;
  line-height: 1;
}

.ecosystem-row em {
  color: #55595d;
  font-style: normal;
  max-width: 620px;
}

.ecosystem-row:hover {
  background: var(--graphite);
  color: var(--white);
  padding-left: 18px;
  padding-right: 18px;
}

.ecosystem-row:hover em {
  color: rgba(255, 253, 248, 0.72);
}

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

.module-tile {
  align-items: center;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  display: grid;
  gap: 16px;
  grid-template-columns: 56px minmax(0, 1fr);
  min-height: 82px;
  padding: 18px 20px;
  transition: background 180ms ease, color 180ms ease;
}

.module-tile:nth-child(2n) {
  border-right: 0;
}

.module-tile span {
  color: var(--amber);
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
}

.module-tile strong {
  font-size: 18px;
  line-height: 1.18;
}

.module-tile:hover {
  background: var(--graphite);
  color: var(--white);
}

.chapter-layout {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  grid-template-columns: minmax(0, 1fr) 330px;
}

.side-rail {
  border-left: 1px solid var(--line);
  padding-left: 24px;
}

.callout {
  background: var(--graphite);
  color: var(--white);
  margin: 28px 0;
  padding: clamp(22px, 4vw, 36px);
}

.reader-frame {
  background: var(--graphite);
  border: 1px solid var(--line);
  height: min(78vh, 860px);
  margin-top: 18px;
  min-height: 560px;
  width: 100%;
}

.reader-frame iframe {
  border: 0;
  display: block;
  height: 100%;
  width: 100%;
}

.callout .eyebrow {
  margin-bottom: 12px;
}

.site-footer {
  align-items: end;
  border-top: 1px solid var(--line);
  display: flex;
  gap: 24px;
  justify-content: space-between;
  padding: 30px clamp(18px, 4vw, 56px);
}

.site-footer p {
  color: var(--steel);
  margin: 6px 0 0;
}

.site-footer a {
  color: var(--steel);
  font-family: var(--mono);
  font-size: 12px;
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .main-nav {
    justify-content: flex-start;
  }

  .hero,
  .split,
  .chapter-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero h1 {
    font-size: 68px;
  }

  .poster-hero {
    min-height: auto;
    padding-top: 82px;
  }

  .poster-hero h1 {
    font-size: clamp(54px, 8vw, 66px);
  }

  .hero::after {
    font-size: 112px;
  }

  .poster-hero::after {
    font-size: 68px;
  }

  .poster-word {
    bottom: auto;
    color: rgba(0, 0, 0, 0.12);
    font-size: 108px;
    left: -8px;
    top: 230px;
  }

  .hero-visual {
    min-height: 0;
  }

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

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

  .side-rail {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 24px;
  }
}

@media (max-width: 640px) {
  .site-header {
    gap: 16px;
    min-height: 0;
    padding-bottom: 12px;
    padding-top: 12px;
  }

  .main-nav {
    flex-wrap: nowrap;
    overflow-x: auto;
    width: 100%;
  }

  .main-nav a {
    flex: 0 0 auto;
    min-height: 36px;
    padding: 8px 10px;
  }

  .hero {
    gap: 18px;
    padding-bottom: 26px;
    padding-top: 30px;
  }

  .poster-hero {
    padding-top: 70px;
  }

  .hero-visual img {
    max-height: 220px;
    max-width: 72%;
  }

  .poster-hero .hero-visual img {
    max-height: 260px;
    max-width: 78%;
  }

  h1 {
    font-size: 42px;
  }

  .hero h1 {
    font-size: 46px;
  }

  .poster-hero h1 {
    font-size: 46px;
  }

  h2 {
    font-size: 34px;
  }

  h3 {
    font-size: 24px;
  }

  .lead {
    font-size: 17px;
  }

  .button-row {
    margin-top: 22px;
  }

  .button {
    min-height: 38px;
    min-width: 0;
    padding: 8px 12px;
  }

  .read-next-hint {
    display: none;
  }

  .hero::after {
    font-size: 72px;
  }

  .poster-hero::after {
    display: none;
  }

  .poster-word {
    color: rgba(0, 0, 0, 0.08);
    font-size: 68px;
    top: 220px;
  }

  .kinetic-strip {
    font-size: 10px;
    letter-spacing: 0.24em;
    padding: 10px 0;
  }

  .kinetic-track {
    gap: 34px;
  }

  .poster-note {
    display: none;
  }

  .ecosystem-row {
    align-items: start;
    gap: 10px;
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .ecosystem-row em {
    grid-column: 2;
  }

  .ecosystem-row strong {
    font-size: 28px;
  }

  .welcome-action {
    align-items: start;
    gap: 10px;
    grid-template-columns: 42px minmax(0, 1fr);
    min-height: 0;
    padding: 18px 0;
  }

  .welcome-action em,
  .welcome-action b {
    grid-column: 2;
  }

  .welcome-action strong {
    font-size: 24px;
  }

  .welcome-action b {
    width: fit-content;
  }

  .reader-frame {
    height: 620px;
    min-height: 420px;
  }

  .grid.two,
  .grid.three,
  .grid.four,
  .read-next-hint,
  .module-grid {
    grid-template-columns: 1fr;
  }

  .module-tile,
  .module-tile:nth-child(2n) {
    border-right: 0;
  }

  .toc-row {
    align-items: start;
    grid-template-columns: 1fr;
  }

  .toc-row .quiet-link {
    width: 100%;
  }

  .site-footer {
    align-items: start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  .kinetic-track,
  .poster-word {
    animation: none;
  }

  .poster-hero .hero-visual {
    transform: none;
  }
}