:root {
  --black: #090806;
  --ink: #11100c;
  --ink-2: #17150f;
  --paper: #efe1c1;
  --paper-soft: #cbbda0;
  --muted: #8f856f;
  --orange: #ff5a14;
  --orange-deep: #ba3510;
  --yellow: #efb642;
  --line: rgba(239, 225, 193, 0.16);
  --line-soft: rgba(239, 225, 193, 0.08);
  --serif: Georgia, "Times New Roman", serif;
  --sans: "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  --display: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif;
}

* {
  box-sizing: border-box;
}

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

body {
  background: var(--black);
  color: var(--paper);
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
}

body,
button,
input {
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

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

img {
  display: block;
  height: auto;
  max-width: 100%;
}

canvas {
  display: block;
  max-width: 100%;
}

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

.skip-link {
  background: var(--orange);
  color: #fff;
  font: 800 0.75rem/1 var(--sans);
  left: 1rem;
  letter-spacing: 0.12em;
  padding: 1rem 1.2rem;
  position: fixed;
  text-decoration: none;
  text-transform: uppercase;
  top: -6rem;
  z-index: 200;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  align-items: center;
  background: rgba(9, 8, 6, 0.82);
  border-bottom: 1px solid transparent;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  left: 0;
  padding: 1.1rem clamp(1.25rem, 4vw, 4rem);
  position: fixed;
  right: 0;
  top: 0;
  transition: background 250ms ease, border-color 250ms ease;
  z-index: 100;
}

.site-header.scrolled {
  backdrop-filter: blur(18px);
  border-color: var(--line);
}

.wordmark {
  align-items: center;
  display: flex;
  font: 700 0.83rem/1 var(--sans);
  gap: 0.75rem;
  letter-spacing: 0.12em;
  text-decoration: none;
  text-transform: uppercase;
}

.wordmark-mark {
  align-items: center;
  border: 1px solid var(--orange);
  color: var(--orange);
  display: inline-flex;
  font: italic 700 1.05rem/1 var(--serif);
  height: 2rem;
  justify-content: center;
  width: 2rem;
}

.site-header nav {
  display: flex;
  gap: clamp(1.4rem, 3vw, 3rem);
}

.site-header nav a,
.header-listen {
  color: var(--paper-soft);
  font: 700 0.7rem/1 var(--sans);
  letter-spacing: 0.13em;
  text-decoration: none;
  text-transform: uppercase;
}

.site-header nav a:hover,
.site-header nav a:focus-visible {
  color: var(--orange);
}

.header-listen {
  justify-self: end;
}

.header-listen::after {
  color: var(--orange);
  content: " ▶";
}

.hero {
  background:
    radial-gradient(circle at 83% 39%, rgba(255, 90, 20, 0.22), transparent 29%),
    var(--ink);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.75fr);
  min-height: 100svh;
  overflow: hidden;
  padding: clamp(8rem, 14vh, 11rem) clamp(1.5rem, 7vw, 8rem) 6rem;
  position: relative;
}

.hero-grid {
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: clamp(42px, 4.3vw, 72px) clamp(42px, 4.3vw, 72px);
  inset: 0;
  mask-image: linear-gradient(90deg, #000, transparent 82%);
  pointer-events: none;
  position: absolute;
}

.hero-copy {
  align-self: center;
  max-width: 790px;
  position: relative;
  z-index: 2;
}

.eyebrow,
.section-index,
.mini-label {
  color: var(--orange);
  font: 800 0.7rem/1.2 var(--sans);
  letter-spacing: 0.22em;
  margin: 0;
  text-transform: uppercase;
}

.eyebrow {
  align-items: center;
  display: flex;
  gap: 0.75rem;
}

.eyebrow span {
  background: var(--orange);
  display: inline-block;
  height: 2px;
  width: 2.7rem;
}

.hero h1 {
  font: 700 clamp(4.7rem, 9.6vw, 10.5rem)/0.76 var(--serif);
  letter-spacing: -0.075em;
  margin: 2.2rem 0 0;
}

.hero h1 em {
  color: var(--orange);
  font-weight: 400;
}

.hero-deck {
  color: var(--paper-soft);
  font: italic clamp(1.15rem, 2.1vw, 1.7rem)/1.45 var(--serif);
  margin: 2.4rem 0 0;
  max-width: 690px;
}

.hero-facts {
  border-bottom: 1px solid var(--line);
  border-top: 1px solid var(--line);
  display: flex;
  gap: 0;
  margin-top: 2.5rem;
  max-width: 690px;
}

.hero-facts span {
  color: var(--muted);
  flex: 1;
  font: 800 0.68rem/1.1 var(--sans);
  letter-spacing: 0.13em;
  padding: 1.1rem 1rem 1rem 0;
  text-transform: uppercase;
}

.hero-facts b {
  color: var(--paper);
  font-size: 0.95rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2.2rem;
}

.button {
  align-items: center;
  border: 1px solid var(--line);
  cursor: pointer;
  display: inline-flex;
  font: 800 0.72rem/1 var(--sans);
  gap: 0.7rem;
  justify-content: center;
  letter-spacing: 0.14em;
  min-height: 3.7rem;
  padding: 0 1.6rem;
  text-decoration: none;
  text-transform: uppercase;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.button svg {
  fill: none;
  height: 1.15rem;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  width: 1.15rem;
}

.button .play-icon {
  fill: currentColor;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #fff;
}

.button-primary:hover,
.button-primary:focus-visible {
  background: var(--paper);
  border-color: var(--paper);
  color: var(--black);
}

.button-ghost {
  background: transparent;
  color: var(--paper);
}

.button-ghost:hover,
.button-ghost:focus-visible {
  border-color: var(--paper);
}

.no-gate {
  color: var(--muted);
  font: 700 0.64rem/1 var(--sans);
  letter-spacing: 0.1em;
  margin: 1rem 0 0;
  text-transform: uppercase;
}

.cover-stage {
  align-items: center;
  align-self: center;
  display: flex;
  justify-content: center;
  min-height: 580px;
  perspective: 1200px;
  position: relative;
}

.book {
  margin: 0;
  max-width: min(390px, 80%);
  position: relative;
  transform: rotate(2.4deg) rotateY(-7deg);
  transition: transform 350ms ease;
  z-index: 3;
}

.book:hover {
  transform: rotate(0deg) rotateY(0deg) translateY(-8px);
}

.book::after {
  background: rgba(0, 0, 0, 0.55);
  content: "";
  filter: blur(24px);
  height: 8%;
  left: 2%;
  position: absolute;
  right: -7%;
  top: 98%;
  transform: skewX(-12deg);
  z-index: -1;
}

.book img {
  box-shadow: 24px 35px 70px rgba(0, 0, 0, 0.58);
  width: 100%;
}

.orbit {
  border: 1px solid rgba(255, 90, 20, 0.27);
  border-radius: 50%;
  position: absolute;
}

.orbit::after {
  background: var(--orange);
  border-radius: 50%;
  box-shadow: 0 0 18px rgba(255, 90, 20, 0.7);
  content: "";
  height: 8px;
  left: 50%;
  position: absolute;
  top: -4px;
  width: 8px;
}

.orbit-one {
  animation: orbit 18s linear infinite;
  height: 520px;
  width: 520px;
}

.orbit-two {
  animation: orbit 28s linear infinite reverse;
  height: 650px;
  width: 650px;
}

@keyframes orbit {
  to { transform: rotate(360deg); }
}

.cover-note {
  bottom: 2rem;
  color: var(--paper-soft);
  font: italic 0.87rem/1.45 var(--serif);
  position: absolute;
  right: -1rem;
  z-index: 4;
}

.cover-note span {
  color: var(--orange);
  display: block;
  font: 900 2rem/1 var(--sans);
  letter-spacing: -0.06em;
}

.scroll-cue {
  align-items: center;
  bottom: 2rem;
  color: var(--muted);
  display: flex;
  font: 800 0.62rem/1 var(--sans);
  gap: 0.7rem;
  left: clamp(1.5rem, 7vw, 8rem);
  letter-spacing: 0.17em;
  position: absolute;
  text-decoration: none;
  text-transform: uppercase;
}

.scroll-cue svg {
  fill: none;
  height: 1.15rem;
  stroke: var(--orange);
  stroke-width: 1.8;
  width: 1.15rem;
}

.opening,
.distinction,
.limits {
  padding: clamp(6rem, 11vw, 11rem) clamp(1.5rem, 8vw, 9rem);
}

.opening {
  background: var(--paper);
  color: var(--black);
}

.opening .section-index {
  border-bottom: 1px solid rgba(9, 8, 6, 0.18);
  color: var(--orange-deep);
  padding-bottom: 1.2rem;
}

.opening-copy {
  display: grid;
  gap: clamp(1.5rem, 3vw, 4rem);
  grid-template-columns: 1.3fr 1fr 1fr;
  margin: clamp(3rem, 6vw, 6rem) auto 0;
  max-width: 1240px;
}

.opening-copy p {
  font: 1.08rem/1.75 var(--serif);
  margin: 0;
}

.opening-copy .lead {
  font-size: clamp(2rem, 3.3vw, 3.4rem);
  line-height: 1.08;
}

.equation-statement {
  align-items: center;
  display: flex;
  font: italic clamp(2.2rem, 6.2vw, 6.6rem)/1 var(--serif);
  gap: clamp(1rem, 2.5vw, 2.5rem);
  justify-content: center;
  margin: clamp(5rem, 10vw, 10rem) auto 0;
}

.equation-label {
  color: var(--orange-deep);
}

.equals {
  font-style: normal;
  opacity: 0.45;
}

.fraction {
  display: inline-grid;
  text-align: center;
}

.fraction span {
  padding: 0.18em 0.35em;
}

.fraction span:first-child {
  border-bottom: 2px solid var(--black);
}

.fraction span:last-child {
  font-size: 0.72em;
}

.equation-caption {
  font: italic 1.05rem/1.65 var(--serif);
  margin: 3rem auto 0;
  max-width: 690px;
  text-align: center;
}

.equation-lab {
  background:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px),
    var(--ink);
  background-size: 58px 58px;
  padding: clamp(6rem, 11vw, 11rem) clamp(1.5rem, 8vw, 9rem);
}

.section-heading {
  display: grid;
  gap: 2rem;
  grid-template-columns: 0.5fr 1.4fr 1fr;
}

.section-heading h2,
.inside h2,
.listen h2,
.limits h2,
.closing h2 {
  font: 700 clamp(3.4rem, 7vw, 7rem)/0.85 var(--serif);
  letter-spacing: -0.06em;
  margin: 0;
}

h2 em {
  color: var(--orange);
  font-weight: 400;
}

.section-heading > p:last-child,
.inside-intro > p:last-child,
.listen-copy > p:not(.section-index),
.closing-action > div > p:not(.section-index) {
  align-self: end;
  color: var(--paper-soft);
  font: 1.05rem/1.75 var(--serif);
  margin: 0;
}

.lab-shell {
  border: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(280px, 0.72fr) minmax(520px, 1.28fr);
  margin-top: clamp(3.5rem, 7vw, 7rem);
  max-width: 1380px;
}

.lab-controls {
  background: var(--ink-2);
  border-right: 1px solid var(--line);
  display: grid;
  gap: 1rem;
  padding: clamp(1.8rem, 4vw, 4rem);
}

.lab-controls label {
  align-items: center;
  color: var(--paper-soft);
  display: flex;
  font: 800 0.7rem/1 var(--sans);
  justify-content: space-between;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.lab-controls output {
  color: var(--orange);
  font: 700 1.5rem/1 var(--serif);
}

input[type="range"] {
  accent-color: var(--orange);
  cursor: pointer;
  margin: 0 0 1.5rem;
  width: 100%;
}

.lab-results {
  align-items: center;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  min-height: 360px;
  padding: clamp(2rem, 5vw, 5rem);
}

.lab-results article {
  text-align: center;
}

.lab-results article p {
  color: var(--muted);
  font: 800 0.7rem/1 var(--sans);
  letter-spacing: 0.15em;
  margin: 0;
  text-transform: uppercase;
}

.lab-results strong {
  color: var(--paper);
  display: block;
  font: 700 clamp(4rem, 8vw, 7.5rem)/1 var(--serif);
  letter-spacing: -0.07em;
  margin: 0.6rem 0;
}

.lab-results article:last-child strong {
  color: var(--orange);
}

.lab-results article span {
  color: var(--muted);
  display: block;
  font: italic 0.85rem/1.4 var(--serif);
}

.same-actual {
  align-items: center;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  font: 800 0.6rem/1 var(--sans);
  gap: 0.35rem;
  letter-spacing: 0.16em;
  padding: 0 1.2rem;
  text-transform: uppercase;
}

.same-actual::before,
.same-actual::after {
  background: var(--line);
  content: "";
  height: 80px;
  width: 1px;
}

.same-actual b {
  color: var(--orange);
}

.lab-note {
  color: var(--muted);
  font: italic 0.82rem/1.6 var(--serif);
  margin: 1.4rem 0 0;
  max-width: 700px;
}

.cloud-section {
  background: var(--paper);
  color: var(--black);
  display: grid;
  grid-template-columns: minmax(320px, 0.7fr) minmax(520px, 1.3fr);
  min-height: 850px;
}

.cloud-copy {
  align-self: center;
  padding: clamp(5rem, 9vw, 9rem);
  padding-right: clamp(2rem, 5vw, 5rem);
}

.cloud-copy .section-index {
  color: var(--orange-deep);
}

.cloud-copy h2 {
  font: 700 clamp(3.5rem, 6vw, 6.6rem)/0.88 var(--serif);
  letter-spacing: -0.06em;
  margin: 2rem 0 0;
}

.cloud-copy h2 em {
  color: var(--orange-deep);
}

.cloud-copy > p:not(.section-index) {
  font: 1.05rem/1.78 var(--serif);
  margin: 2rem 0 0;
  max-width: 530px;
}

.cloud-tabs {
  display: flex;
  gap: 0.55rem;
  margin-top: 2.5rem;
}

.cloud-tabs button {
  background: transparent;
  border: 1px solid rgba(9, 8, 6, 0.22);
  color: var(--black);
  cursor: pointer;
  font: 800 0.67rem/1 var(--sans);
  letter-spacing: 0.12em;
  padding: 0.85rem 1rem;
  text-transform: uppercase;
}

.cloud-tabs button.active,
.cloud-tabs button:hover,
.cloud-tabs button:focus-visible {
  background: var(--black);
  border-color: var(--black);
  color: var(--paper);
}

.cloud-visual {
  background: var(--ink);
  min-height: 850px;
  overflow: hidden;
  position: relative;
}

#cloud-canvas {
  height: 100%;
  inset: 0;
  position: absolute;
  width: 100%;
}

.cloud-axis {
  bottom: 2rem;
  color: var(--muted);
  display: flex;
  font: 800 0.58rem/1 var(--sans);
  justify-content: space-between;
  left: 2rem;
  letter-spacing: 0.13em;
  position: absolute;
  right: 2rem;
  text-transform: uppercase;
}

.cloud-reading {
  left: 2.5rem;
  max-width: 330px;
  position: absolute;
  top: 2.5rem;
}

.cloud-reading span {
  color: var(--orange);
  font: 900 0.65rem/1 var(--sans);
  letter-spacing: 0.2em;
}

.cloud-reading p {
  font: italic 2rem/1.1 var(--serif);
  margin: 0.6rem 0;
}

.cloud-reading small {
  color: var(--paper-soft);
  font: 0.82rem/1.55 var(--serif);
}

.distinction {
  background: var(--orange);
  color: var(--black);
}

.distinction .section-index {
  color: var(--black);
}

.distinction-grid {
  display: grid;
  gap: 0;
  grid-template-columns: 1fr 1fr;
  margin-top: 3rem;
}

.distinction-grid article {
  border: 1px solid rgba(9, 8, 6, 0.27);
  padding: clamp(2rem, 5vw, 5rem);
}

.distinction-grid article + article {
  border-left: 0;
}

.giant-number {
  font: 900 clamp(4rem, 9vw, 9rem)/0.8 var(--display);
  opacity: 0.14;
}

.distinction .mini-label {
  color: var(--black);
  margin-top: 2.4rem;
}

.distinction h3 {
  font: 700 clamp(2rem, 4vw, 4.2rem)/0.98 var(--serif);
  letter-spacing: -0.04em;
  margin: 1.1rem 0 0;
  max-width: 650px;
}

.distinction article > p:last-child {
  font: 1rem/1.7 var(--serif);
  max-width: 570px;
}

.distinction-line {
  font: italic clamp(1.5rem, 3vw, 2.8rem)/1.2 var(--serif);
  margin: 3rem 0 0;
  text-align: center;
}

.inside {
  background: var(--ink);
  display: grid;
  gap: clamp(4rem, 8vw, 9rem);
  grid-template-columns: minmax(320px, 0.8fr) minmax(520px, 1.2fr);
  padding: clamp(6rem, 11vw, 11rem) clamp(1.5rem, 8vw, 9rem);
}

.inside-intro {
  align-self: start;
  position: sticky;
  top: 8rem;
}

.inside-intro h2 {
  margin-top: 2rem;
}

.inside-intro > p:last-child {
  margin-top: 2.5rem;
  max-width: 540px;
}

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

.part {
  border-bottom: 1px solid var(--line);
}

.part summary {
  align-items: center;
  cursor: pointer;
  display: grid;
  gap: 1rem;
  grid-template-columns: 3rem 1fr auto;
  list-style: none;
  padding: 2rem 0;
}

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

.part summary span {
  color: var(--orange);
  font: italic 1.4rem/1 var(--serif);
}

.part summary h3 {
  font: 700 clamp(1.5rem, 2.8vw, 2.5rem)/1 var(--serif);
  letter-spacing: -0.03em;
  margin: 0;
}

.part summary small {
  color: var(--muted);
  font: 800 0.63rem/1 var(--sans);
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.part summary::after {
  color: var(--orange);
  content: "+";
  font: 300 1.8rem/1 var(--sans);
  grid-column: 4;
}

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

.part > p {
  color: var(--paper-soft);
  font: 1rem/1.72 var(--serif);
  margin: -0.5rem 3rem 2rem 4rem;
  max-width: 680px;
}

.listen {
  background: var(--paper);
  color: var(--black);
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  min-height: 800px;
}

.listen-art {
  align-items: center;
  background:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px),
    var(--ink);
  background-size: 50px 50px;
  display: flex;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.record {
  align-items: center;
  animation: record-spin 28s linear infinite;
  background:
    repeating-radial-gradient(circle, #080705 0 7px, #1b1812 8px 10px);
  border: 1px solid var(--line);
  border-radius: 50%;
  box-shadow: 0 35px 80px rgba(0, 0, 0, 0.7);
  display: flex;
  height: min(33vw, 470px);
  justify-content: center;
  width: min(33vw, 470px);
}

.record::before {
  background: var(--orange);
  border: 8px solid #d8c59d;
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--orange);
  content: "";
  height: 34%;
  position: absolute;
  width: 34%;
}

.record span {
  color: var(--black);
  font: 900 0.62rem/1.35 var(--sans);
  letter-spacing: 0.1em;
  position: relative;
  text-align: center;
  z-index: 2;
}

.record small {
  font-size: 0.48rem;
}

@keyframes record-spin {
  to { transform: rotate(360deg); }
}

.listen-copy {
  align-self: center;
  padding: clamp(5rem, 9vw, 9rem);
}

.listen-copy .section-index {
  color: var(--orange-deep);
}

.listen h2 {
  margin-top: 2rem;
}

.listen h2 em {
  color: var(--orange-deep);
}

.listen-copy > p:not(.section-index) {
  color: #4b4437;
  margin-top: 2rem;
  max-width: 620px;
}

.audio-player {
  align-items: center;
  border-bottom: 1px solid rgba(9, 8, 6, 0.25);
  border-top: 1px solid rgba(9, 8, 6, 0.25);
  display: flex;
  gap: 1.2rem;
  margin-top: 3rem;
  padding: 1.5rem 0;
}

.audio-main {
  align-items: center;
  background: var(--orange-deep);
  border: 0;
  border-radius: 50%;
  color: #fff;
  cursor: pointer;
  display: flex;
  flex: 0 0 auto;
  height: 4rem;
  justify-content: center;
  width: 4rem;
}

.audio-main svg {
  fill: none;
  height: 1.5rem;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-width: 2;
  width: 1.5rem;
}

.audio-main .play-icon {
  fill: currentColor;
  stroke: none;
}

.audio-track {
  flex: 1;
}

.audio-meta {
  align-items: baseline;
  display: flex;
  justify-content: space-between;
}

.audio-meta strong {
  font: 700 1rem/1 var(--serif);
}

.audio-meta span,
.audio-time {
  color: #655c4b;
  font: 700 0.6rem/1 var(--sans);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.audio-track input {
  accent-color: var(--orange-deep);
  margin: 1rem 0 0.65rem;
}

.audio-time {
  display: flex;
  justify-content: space-between;
}

.listen-links {
  display: flex;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.text-link {
  background: transparent;
  border: 0;
  border-bottom: 1px solid currentColor;
  color: var(--orange-deep);
  cursor: pointer;
  font: 800 0.67rem/1.6 var(--sans);
  letter-spacing: 0.13em;
  padding: 0;
  text-decoration: none;
  text-transform: uppercase;
}

.limits {
  background: var(--ink-2);
  display: grid;
  gap: clamp(3rem, 8vw, 10rem);
  grid-template-columns: 1fr 1fr;
}

.limits h2 {
  margin-top: 2rem;
}

.limits-copy {
  align-self: end;
}

.limits-copy > p {
  color: var(--paper-soft);
  font: 1.05rem/1.75 var(--serif);
}

.limits-copy blockquote {
  border-left: 3px solid var(--orange);
  font: italic 1.5rem/1.4 var(--serif);
  margin: 2.2rem 0 0;
  padding-left: 1.5rem;
}

.closing {
  background: var(--black);
}

.closing-equation {
  background: var(--orange);
  color: var(--black);
  padding: clamp(4rem, 9vw, 9rem);
  text-align: center;
}

.closing-equation p {
  font: italic clamp(2rem, 4.8vw, 5.2rem)/1.04 var(--serif);
  letter-spacing: -0.04em;
  margin: 0;
}

.closing-action {
  align-items: center;
  display: grid;
  gap: clamp(3rem, 8vw, 9rem);
  grid-template-columns: minmax(250px, 0.55fr) minmax(440px, 1.1fr);
  margin: 0 auto;
  max-width: 1180px;
  padding: clamp(6rem, 11vw, 11rem) clamp(1.5rem, 5vw, 5rem);
}

.closing-action > img {
  box-shadow: 20px 25px 60px rgba(0, 0, 0, 0.55);
  transform: rotate(-2deg);
}

.closing h2 {
  margin-top: 2rem;
}

.closing-action > div > p:not(.section-index) {
  margin: 2rem 0 2.5rem;
  max-width: 600px;
}

footer {
  align-items: center;
  background: var(--black);
  border-top: 1px solid var(--line);
  color: var(--muted);
  display: grid;
  font: 700 0.62rem/1 var(--sans);
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  letter-spacing: 0.11em;
  padding: 2rem clamp(1.5rem, 5vw, 5rem);
  text-transform: uppercase;
}

footer p {
  margin: 0;
}

footer > div {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
}

footer > p:last-child {
  text-align: right;
}

.footer-title {
  color: var(--paper);
  font: 700 1.1rem/1 var(--serif);
  letter-spacing: 0;
  text-decoration: none;
  text-transform: none;
}

footer a:hover,
footer a:focus-visible {
  color: var(--orange);
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 700ms ease, transform 700ms cubic-bezier(.2,.7,.2,1);
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 1050px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-header nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr 0.72fr;
    padding-left: 2.5rem;
    padding-right: 2.5rem;
  }

  .hero h1 {
    font-size: clamp(4rem, 10vw, 7rem);
  }

  .cover-stage {
    min-height: 520px;
  }

  .orbit-one {
    height: 430px;
    width: 430px;
  }

  .orbit-two {
    height: 540px;
    width: 540px;
  }

  .section-heading {
    grid-template-columns: 1fr 2fr;
  }

  .section-heading > p:last-child {
    grid-column: 2;
  }

  .lab-shell {
    grid-template-columns: 0.72fr 1.28fr;
  }

  .cloud-section,
  .listen {
    grid-template-columns: 1fr 1fr;
  }

  .cloud-copy,
  .listen-copy {
    padding: 4rem 2.5rem;
  }

  .inside {
    gap: 4rem;
    padding-left: 2.5rem;
    padding-right: 2.5rem;
  }
}

@media (max-width: 780px) {
  .site-header {
    padding: 0.9rem 1rem;
  }

  .wordmark {
    font-size: 0.64rem;
  }

  .header-listen {
    font-size: 0.58rem;
  }

  .hero {
    display: flex;
    flex-direction: column;
    min-height: auto;
    padding: 7rem 1.25rem 5rem;
  }

  .hero h1 {
    font-size: clamp(4.4rem, 22vw, 7rem);
    line-height: 0.8;
  }

  .hero-deck {
    font-size: 1.15rem;
  }

  .hero-facts {
    flex-wrap: wrap;
  }

  .hero-facts span {
    flex: 0 0 50%;
  }

  .hero-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .cover-stage {
    margin-top: 4rem;
    min-height: 570px;
  }

  .book {
    max-width: min(380px, 82vw);
  }

  .orbit-one {
    height: 400px;
    width: 400px;
  }

  .orbit-two {
    height: 510px;
    width: 510px;
  }

  .cover-note {
    bottom: 0;
    right: 0;
  }

  .scroll-cue {
    display: none;
  }

  .opening,
  .distinction,
  .limits,
  .equation-lab,
  .inside {
    padding: 5rem 1.25rem;
  }

  .opening-copy,
  .section-heading,
  .lab-shell,
  .cloud-section,
  .distinction-grid,
  .inside,
  .listen,
  .limits,
  .closing-action {
    display: block;
  }

  .opening-copy p + p {
    margin-top: 1.7rem;
  }

  .equation-statement {
    font-size: clamp(1.75rem, 10vw, 3.2rem);
    gap: 0.55rem;
  }

  .section-heading h2 {
    margin-top: 1.6rem;
  }

  .section-heading > p:last-child {
    margin-top: 1.8rem;
  }

  .lab-controls {
    border-bottom: 1px solid var(--line);
    border-right: 0;
  }

  .lab-results {
    grid-template-columns: 1fr 1fr;
    min-height: 300px;
    padding: 2.3rem 1rem;
  }

  .lab-results strong {
    font-size: 3.8rem;
  }

  .same-actual {
    display: none;
  }

  .cloud-copy {
    padding: 5rem 1.25rem;
  }

  .cloud-visual {
    min-height: 620px;
  }

  .cloud-reading {
    left: 1.25rem;
    right: 1.25rem;
    top: 1.5rem;
  }

  .cloud-axis {
    bottom: 1.25rem;
    left: 1rem;
    right: 1rem;
  }

  .cloud-axis span:nth-child(2) {
    display: none;
  }

  .distinction-grid article + article {
    border-left: 1px solid rgba(9, 8, 6, 0.27);
    border-top: 0;
  }

  .inside-intro {
    position: static;
  }

  .parts-list {
    margin-top: 4rem;
  }

  .part summary {
    grid-template-columns: 2rem 1fr;
  }

  .part summary small {
    grid-column: 2;
  }

  .part summary::after {
    grid-column: 3;
    grid-row: 1 / 3;
  }

  .part > p {
    margin-left: 3rem;
    margin-right: 0;
  }

  .listen-art {
    min-height: 520px;
  }

  .record {
    height: min(82vw, 420px);
    width: min(82vw, 420px);
  }

  .listen-copy {
    padding: 5rem 1.25rem;
  }

  .audio-meta {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.45rem;
  }

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

  .closing-equation {
    padding: 5rem 1.25rem;
  }

  .closing-equation p {
    font-size: clamp(1.65rem, 7.6vw, 3rem);
  }

  .closing-action {
    padding: 5rem 1.25rem;
  }

  .closing-action > img {
    margin: 0 auto;
    max-width: 340px;
  }

  .closing-action > div {
    margin-top: 4rem;
  }

  footer {
    gap: 1.4rem;
    grid-template-columns: 1fr 1fr;
  }

  footer > div {
    justify-content: flex-start;
  }

  footer > p:last-child {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}