@font-face {
  font-family: Instrument;
  src: url("assets/fonts/instrument-serif-regular.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: DM Sans;
  src: url("assets/fonts/dm-sans-latin.woff2") format("woff2");
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
}
:root {
  --paper: #fcf1eb;
  --blue: #eff5fb;
  --ink: #242d2b;
  --muted: #616760;
  --accent: #3d637c;
  --line: #cfc6bd;
  --display: Instrument, "Songti SC", "Noto Serif CJK SC", SimSun, serif;
  --italic: "Times New Roman", Times, "Liberation Serif", "Noto Serif", serif;
  --sans: "DM Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --header-height: 78px;
  --gutter: clamp(22px, 4.2vw, 72px);
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
button,
input,
select {
  font: inherit;
}
button,
a,
summary,
select {
  -webkit-tap-highlight-color: transparent;
}
button,
select {
  color: inherit;
}
button {
  cursor: pointer;
}
a {
  color: inherit;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
  text-underline-offset: 5px;
}
button {
  background: none;
  border: 0;
}
img,
svg {
  display: block;
  max-width: 100%;
}
figure,
p,
h1,
h2,
h3,
h4,
dl,
dd {
  margin: 0;
}
h1,
h2,
h3,
h4 {
  overflow-wrap: anywhere;
  font-weight: 400;
}
em {
  font-family: var(--italic);
  font-weight: 400;
  letter-spacing: -0.02em;
}
h2 {
  font-family: var(--display);
  font-size: clamp(48px, 5.1vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.025em;
}
h3 {
  line-height: 1.2;
}
p {
  overflow-wrap: break-word;
}
[hidden] {
  display: none !important;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 5px;
}
::selection {
  background: #cadde9;
  color: var(--ink);
}
.wrap {
  width: min(100% - var(--gutter) * 2, 1320px);
  margin-inline: auto;
}
.section {
  padding-block: 112px;
}
.eyebrow,
.cover-kicker {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 500;
}
.caption {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}
.text-link {
  display: inline-flex;
  gap: 20px;
  align-items: center;
  font-size: 14px;
  padding: 8px 0;
  text-decoration: underline;
  text-underline-offset: 5px;
}
.skip-link {
  position: fixed;
  top: 8px;
  left: 12px;
  transform: translateY(-200%);
  z-index: 100;
  background: var(--ink);
  color: var(--paper);
  padding: 12px 20px;
}
.skip-link:focus {
  transform: none;
}
.reading-progress {
  height: 2px;
  position: fixed;
  inset: 0 0 auto;
  z-index: 60;
  pointer-events: none;
}
.reading-progress span {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--accent);
}
.wrap > *,
.section-heading > *,
.cover-deck > *,
.forces-grid > *,
.results-layout > *,
.result-callout > *,
.secondary-results > *,
.token-comparison > *,
.resource-links > a > *,
.chapter-nav > * {
  min-width: 0;
}
.chapter-nav a,
.bar-label,
.mini-row,
.token-comparison dt,
.resource-links p {
  overflow-wrap: anywhere;
}

/* A restrained running header leaves the cover its scale. */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 78px;
  padding: 12px var(--gutter);
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.wordmark {
  min-height: 44px;
  font-family: var(--display);
  font-size: 34px;
  white-space: nowrap;
  display: flex;
  align-items: center;
  line-height: 1;
  gap: 1px;
}
.wordmark:hover {
  text-decoration: none;
}
.wordmark-amp {
  font-family: var(--italic);
  font-style: italic;
}
.wordmark-caption {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-left: 14px;
}
.desktop-nav {
  display: flex;
  gap: 28px;
  font-size: 13px;
}
.desktop-nav a {
  padding: 10px 0;
}
.desktop-nav a[aria-current] {
  text-decoration: underline;
  text-underline-offset: 6px;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 13px;
}
.language-button {
  min-width: 44px;
  min-height: 44px;
  padding: 0;
}
.paper-link {
  min-height: 44px;
  display: flex;
  gap: 20px;
  align-items: center;
  border-bottom: 1px solid var(--ink);
  padding: 7px 0;
}
.paper-short,
.menu-button {
  display: none;
}
.mobile-nav {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  padding: 16px var(--gutter) 24px;
}
.mobile-nav a {
  display: block;
  padding: 10px 0;
  font-size: 17px;
}
/* Cover: one masthead, one continuous visual field. */
.hero {
  padding-top: 32px;
}
.cover-kicker {
  display: flex;
  justify-content: space-between;
  gap: 20px;
}
.hero h1 {
  font-family: var(--display);
  font-size: clamp(100px, 15.3vw, 224px);
  letter-spacing: -0.052em;
  line-height: 0.95;
  margin: 25px 0 28px;
  white-space: normal;
}
.hero-amp {
  font-size: 0.77em;
  margin-inline: 0.015em 0.055em;
}
.hero h1 em {
  letter-spacing: -0.04em;
}
.hero-philosophy {
  max-width: 980px;
  margin: 0 0 32px;
  font-family: var(--italic);
  font-size: clamp(22px, 2.2vw, 30px);
  font-style: italic;
  line-height: 1.4;
  letter-spacing: 0;
  text-wrap: balance;
}
html:lang(zh-CN) .hero-philosophy {
  font-family: var(--display);
  font-size: clamp(19px, 1.8vw, 25px);
  font-style: normal;
  line-height: 1.7;
}
.cover-deck {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  align-items: start;
  gap: 15%;
  margin-bottom: 30px;
}
.hero-subtitle {
  font-size: clamp(20px, 2.1vw, 30px);
  line-height: 1.25;
  letter-spacing: -0.025em;
}
.hero-lead {
  font-size: 15px;
  line-height: 1.7;
  max-width: 470px;
}
.cover-art img {
  width: 100%;
  height: auto;
}
.cover-art figcaption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  font-size: 12px;
}
.cover-art figcaption > a {
  display: flex;
  align-items: center;
  gap: 36px;
  font-size: 14px;
  min-height: 30px;
}
/* The question is a reading spread with a quiet margin index. */

.section-margin {
  padding-top: 8px;
}
.chapter-nav {
  margin-top: 27px;
  display: grid;
  gap: 2px;
}
.chapter-nav a {
  display: grid;
  grid-template-columns: 25px 1fr 12px;
  gap: 8px;
  align-items: center;
  font-size: 13px;
  min-height: 38px;
}
.chapter-number {
  font-size: 10px;
  color: var(--muted);
}
.chapter-arrow {
  font-size: 12px;
  opacity: 0;
}
.chapter-nav a:hover .chapter-arrow,
.chapter-nav a[aria-current] .chapter-arrow {
  opacity: 1;
}
.section-body h2 {
  font-size: clamp(54px, 5.2vw, 78px);
  margin-bottom: 34px;
}
.prose-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 42px;
  font-size: 16px;
  line-height: 1.8;
}

/* A small physical sketch introduces the metaphor before the actual rubrics. */
.aero-inspiration {
  display: grid;
  grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.5fr);
  gap: 8%;
  align-items: center;
  margin: 0 0 42px;
}
.aero-sketch {
  max-width: 320px;
  width: 100%;
  justify-self: center;
}
.aero-drawing {
  position: relative;
}
.aero-drawing img {
  width: 100%;
  height: auto;
}
.aero-lift,
.aero-weight {
  position: absolute;
  left: calc(50% + 17px);
  font-size: 11px;
  line-height: 1.3;
}
.aero-lift {
  top: 10%;
  color: var(--accent);
}
.aero-weight {
  bottom: 8%;
}
.aero-sketch figcaption {
  text-align: center;
  font-size: 10px;
  color: #505e63;
  margin-top: 10px;
}
.aero-copy > p:first-child {
  font-size: 20px;
  line-height: 1.7;
  letter-spacing: -0.01em;
  max-width: 760px;
}
.aero-copy > .caption {
  margin-top: 17px;
  font-size: 11px;
  color: #505e63;
}

:lang(zh-CN) .aero-copy > p:first-child {
  font-size: 18px;
  line-height: 1.9;
}

.numbers-strip {
  padding-bottom: 88px;
}
.numbers-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  padding-top: 28px;
  gap: 30px;
}
.numbers-grid > div {
  display: flex;
  flex-direction: column;
}
.numbers-grid strong {
  font-family: var(--display);
  font-size: 60px;
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin-bottom: 14px;
}
.numbers-grid strong > span {
  font-family: var(--sans);
  font-size: 15px;
  letter-spacing: 0;
}
.numbers-grid > div > span {
  font-size: 14px;
}
.numbers-grid small {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}
/* Evidence is the photographic heart of the page. */
.example-section {
  background: var(--ink);
  color: var(--paper);
  padding-block: 90px;
}
.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 8%;
  align-items: end;
  margin-bottom: 55px;
}
.section-heading .eyebrow {
  margin-bottom: 24px;
}
.section-lead {
  max-width: 360px;
  flex: 0 1 32%;
  font-size: 15px;
  line-height: 1.8;
}
.example-section .section-heading {
  margin-bottom: 40px;
}
.example-section h2 em {
  color: #b9d0df;
}
.question-line {
  border-top: 1px solid #59615b;
  padding: 22px 0 28px;
  display: grid;
  grid-template-columns: 1fr 2.1fr;
  gap: 30px;
  align-items: baseline;
}
.question-line p {
  font-size: 21px;
  line-height: 1.45;
}
.image-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}
.image-heading {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 12px;
  font-size: 13px;
}
.image-heading b {
  font-weight: 500;
  margin-right: 10px;
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 1px solid #69736b;
  border-radius: 50%;
}
.image-heading a {
  font-size: 12px;
  color: #c9cec8;
}
.image-inspect {
  display: block;
  background: #1b2220;
}
.image-inspect img {
  width: 100%;
  height: auto;
  transition: filter 0.25s;
}
.image-inspect:hover img {
  filter: brightness(1.08);
}
.image-pair figcaption {
  font-size: 13px;
  color: #c9cec8;
  margin-top: 12px;
  line-height: 1.6;
}
.reading-controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 42px;
  border-top: 1px solid #59615b;
  border-bottom: 1px solid #59615b;
}
.reading-controls button {
  display: flex;
  align-items: center;
  gap: 16px;
  text-align: left;
  color: var(--paper);
  padding: 18px 20px;
  line-height: 1.3;
  min-height: 65px;
  font-size: 15px;
}
.reading-controls button + button {
  border-left: 1px solid #59615b;
}
.reading-controls button[aria-selected="true"] {
  background: var(--blue);
  color: var(--ink);
}
.reading-controls button > span:last-child {
  margin-left: auto;
}
.tab-number {
  font-size: 11px;
}
.interpretation {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  padding: 30px 0 23px;
  max-width: 900px;
  min-height: 173px;
}
.relation-symbol {
  font-family: var(--display);
  font-size: 68px;
  line-height: 1;
}
.interpretation h3 {
  font-size: 23px;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.interpretation p {
  font-size: 15px;
  line-height: 1.75;
  color: #d7ddd7;
}
.example-section .caption {
  color: #b9c3ba;
  font-size: 12px;
}
.example-section :focus-visible {
  outline-color: #b9d0df;
}
/* The names of the two forces carry the visual weight. */
.forces-section {
  background: var(--blue);
  padding-block: 76px;
}
.forces-section > .wrap > .eyebrow {
  margin-bottom: 26px;
}
.forces-section h2 {
  font-family: var(--sans);
  font-size: 32px;
  line-height: 1.25;
  letter-spacing: -0.03em;
}
.forces-section .section-heading {
  margin-bottom: 28px;
}
.forces-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9%;
}
.force-name {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid #b6c6cf;
  padding-top: 20px;
}
.force-name h3 {
  font-family: var(--display);
  font-size: clamp(78px, 7.5vw, 110px);
  letter-spacing: -0.035em;
  line-height: 1;
}
.force-name > span {
  font-size: 12px;
  align-self: end;
  padding-bottom: 12px;
  color: var(--accent);
}
.forces-grid > article:last-child .force-name h3 {
  font-family: var(--italic);
  font-style: italic;
  color: var(--accent);
}
.force-question {
  font-size: 19px;
  line-height: 1.5;
  margin: 20px 0 30px;
}
.forces-grid dl > div {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 24px;
  margin-top: 24px;
}
.forces-grid dt {
  font-size: 14px;
  font-weight: 500;
  line-height: 1.5;
}
.forces-grid dd {
  font-size: 14px;
  line-height: 1.8;
  color: #505e63;
}
.verification-note {
  margin-top: 44px;
  border-top: 1px solid #b6c6cf;
  display: flex;
  gap: 28px;
  padding-top: 22px;
  font-size: 13px;
  line-height: 1.7;
  color: #505e63;
}
.verification-note > span {
  font-size: 24px;
  color: var(--accent);
}
.verification-note p {
  max-width: 1000px;
}
/* The original paper figure carries the method narrative. */
.method-section .section-heading {
  align-items: center;
}

details {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  padding: 20px 0;
  font-size: 15px;
  line-height: 1.5;
}
summary::-webkit-details-marker {
  display: none;
}
summary > span:last-child {
  font-size: 24px;
  transition: transform 0.2s;
}
details[open] > summary > span:last-child {
  transform: rotate(45deg);
}
/* Results: a generous numerical margin and a common, honest 0–100 axis. */
.results-section {
  background: #f8faf9;
  border-top: 1px solid #e1e4df;
  border-bottom: 1px solid #e1e4df;
}
.results-layout {
  display: grid;
  grid-template-columns: 0.85fr 2fr;
  gap: 50px;
  align-items: start;
}
.result-callout {
  padding-top: 12px;
}
.big-score {
  font-family: var(--display);
  font-size: clamp(90px, 8.3vw, 125px);
  line-height: 1;
  letter-spacing: -0.025em;
  margin: 15px 0 22px;
  color: var(--accent);
}
.big-score > span {
  font-size: inherit;
}
.result-callout > p {
  font-size: 13px;
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-bottom: 4px;
}
.delta {
  font-weight: 600;
  font-size: 18px;
}
.result-callout > p.score-unit {
  font-size: 12px;
  color: var(--muted);
  margin-top: 14px;
}
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 30px;
  font-size: 11px;
}
.legend > span {
  display: flex;
  align-items: center;
  gap: 7px;
}
.swatch {
  width: 10px;
  height: 10px;
  display: block;
}
.base {
  background: #c5aea0;
}
.stage1 {
  background: #9bb4c7;
}
.gf {
  background: var(--accent);
}
.chart-top {
  display: flex;
  gap: 20px;
  align-items: start;
  justify-content: space-between;
  margin-bottom: 30px;
}
.chart-top h3 {
  font-size: 17px;
  line-height: 1.5;
  max-width: 280px;
}
.metric-select {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 10px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.metric-select select {
  font-size: 13px;
  border: 1px solid #bcc5c1;
  border-radius: 0;
  background: transparent;
  min-width: 155px;
  height: 44px;
  padding: 0 28px 0 10px;
  letter-spacing: 0;
  text-transform: none;
  max-width: 100%;
}
.bar-row {
  display: grid;
  grid-template-columns: 137px 1fr 48px;
  gap: 18px;
  align-items: center;
  min-height: 77px;
}
.bar-label {
  font-size: 13px;
  line-height: 1.5;
}
.bar-label > span {
  display: block;
  color: var(--muted);
  font-size: 11px;
}
.bar-track {
  height: 34px;
  background: repeating-linear-gradient(
    to right,
    #dbe1dd 0,
    #dbe1dd 1px,
    transparent 1px,
    transparent 25%
  );
  position: relative;
}
.bar {
  display: block;
  height: 100%;
  transition: width 0.35s;
}
.bar-row strong {
  font-size: 14px;
  font-weight: 500;
  text-align: right;
}
.chart-axis {
  display: flex;
  justify-content: space-between;
  margin: 10px 66px 0 155px;
  font-size: 10px;
  color: var(--muted);
}
.result-chart .caption {
  margin-top: 24px;
  font-size: 12px;
}
.results-table-details {
  margin-top: 44px;
}
.table-hint {
  font-size: 12px;
  display: flex;
  gap: 20px;
  color: var(--muted);
  margin: 0 0 12px;
}
.table-scroll {
  overflow-x: auto;
}
.table-scroll table {
  border-collapse: collapse;
  min-width: 900px;
  width: 100%;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}
.table-scroll caption {
  text-align: left;
  font-size: 12px;
  margin: 14px 0;
}
.table-scroll th,
.table-scroll td {
  padding: 16px 14px;
  text-align: right;
  white-space: nowrap;
  border-bottom: 1px solid #dce2dd;
}
.table-scroll th {
  font-weight: 500;
}
.table-scroll th:first-child {
  text-align: left;
  position: sticky;
  left: 0;
  background: #f8faf9;
  z-index: 1;
}
.table-scroll .ours,
.table-scroll .ours th {
  background: #e1ecf3;
}
.results-table-details > .caption {
  padding: 18px 0 24px;
  max-width: 900px;
}
.secondary-results {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 8%;
  margin-top: 65px;
}
.secondary-results h3 {
  font-family: var(--display);
  font-size: 40px;
  letter-spacing: -0.015em;
  margin: 18px 0;
}
.secondary-results p {
  font-size: 14px;
  line-height: 1.8;
  max-width: 520px;
}
.ablation-heading {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--muted);
  margin-top: 24px;
  margin-bottom: 12px;
}
.mini-row {
  display: grid;
  grid-template-columns: 115px 1fr 42px 48px;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  padding: 8px 0;
}
.mini-row > div {
  height: 6px;
  background: #e2e7e3;
}
.mini-row i {
  height: 100%;
  display: block;
  background: #9bb4c7;
}
.mini-row strong {
  font-size: 12px;
  font-weight: 500;
  text-align: right;
}
.mini-row.ours i {
  background: var(--accent);
}
.mini-row.ours > span:first-child {
  font-weight: 600;
}
.ablation-delta {
  text-align: right;
  color: var(--muted);
  font-size: 10px;
}
.secondary-results .text-link {
  font-size: 12px;
  margin-top: 15px;
}
.urban-gains {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 33px 0 28px;
}
.urban-gains > div {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.urban-gains strong {
  font-family: var(--display);
  font-size: 45px;
  color: var(--accent);
  font-weight: 400;
  line-height: 1;
}
.urban-gains span {
  font-size: 11px;
}
.secondary-results .caption {
  font-size: 12px;
}
/* Two quiet paper panels show the small-sample response analysis. */
.token-section .section-heading {
  margin-bottom: 32px;
}
.analysis-meta {
  display: flex;
  align-items: center;
  gap: 30px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  font-size: 12px;
}
.sample-count {
  display: flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
}
.sample-count strong {
  font-family: var(--display);
  font-size: 32px;
  font-weight: 400;
  line-height: 1;
}
.analysis-meta p {
  color: var(--muted);
}
.token-comparison {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-bottom: 1px solid var(--line);
}
.token-comparison article {
  padding: 32px 38px;
}
.token-base {
  background: #f3e5db;
}
.token-gf {
  background: var(--blue);
}
.token-heading {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-size: 11px;
}
.density-value {
  font-family: var(--display);
  font-size: 96px;
  line-height: 1.1;
  letter-spacing: -0.035em;
  margin-top: 28px;
}
.density-value > span {
  font-size: 42px;
  margin-left: 6px;
}
.token-gf .density-value {
  color: var(--accent);
}
.token-comparison article > p {
  font-size: 13px;
  margin: 7px 0 20px;
}
.density-track {
  height: 7px;
  background: #dccfc5;
  margin-bottom: 30px;
}
.density-track span {
  height: 100%;
  background: #927e71;
  display: block;
}
.token-gf .density-track {
  background: #d1dee7;
}
.token-gf .density-track span {
  background: var(--accent);
}
.token-comparison dl > div {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-size: 13px;
  margin-top: 14px;
}
.token-comparison dd {
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.token-comparison small {
  font-size: 10px;
}
.token-caption {
  display: flex;
  justify-content: space-between;
  gap: 50px;
  margin-top: 22px;
  align-items: start;
}
.token-caption p {
  max-width: 800px;
  font-size: 12px;
}
.token-caption a {
  white-space: nowrap;
  font-size: 12px;
  padding-top: 0;
}
/* A compact final invitation, with useful destinations in plain sight. */
.resources-section {
  background: #e2ebee;
  padding-block: 70px;
}
.resources-section > .wrap {
  display: grid;
  grid-template-columns: 0.85fr 2fr;
  column-gap: 50px;
}
.resources-section .eyebrow {
  grid-column: 1;
  margin-bottom: 20px;
}
.resources-section h2 {
  grid-column: 1;
  font-size: 60px;
  line-height: 1.05;
  max-width: 280px;
}
.resource-links {
  grid-column: 2;
  grid-row: 1/4;
}
.resource-links > a {
  display: grid;
  grid-template-columns: 30px 1fr 30px;
  gap: 20px;
  align-items: center;
  border-top: 1px solid #b5c5ca;
  padding: 22px 0;
}
.resource-links > a:last-child {
  border-bottom: 1px solid #b5c5ca;
}
.resource-links > a > span {
  font-size: 11px;
}
.resource-links > a > span:last-child {
  font-size: 26px;
  text-align: right;
}
.resource-links h3 {
  font-size: 20px;
  line-height: 1.4;
}
.resource-links p {
  font-size: 12px;
  color: #52626a;
  margin-top: 5px;
}
.resource-note {
  grid-column: 2;
  margin-top: 20px;
  display: flex;
  gap: 10px 25px;
  flex-wrap: wrap;
  font-size: 11px;
  color: #52626a;
}
.resource-note > p {
  max-width: 420px;
  flex: 1 1 300px;
}
.resource-note button {
  min-height: 44px;
  font-size: 11px;
  white-space: nowrap;
  padding: 0;
  align-self: start;
}
.resource-note #copy-status {
  flex-basis: 100%;
}
.site-footer {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 20px;
  align-items: center;
  padding-block: 32px;
}
.footer-brand {
  font-family: var(--display);
  font-size: 29px;
  letter-spacing: -0.02em;
}
.site-footer > p {
  font-size: 12px;
  color: var(--muted);
}
.site-footer > a:last-of-type {
  font-size: 12px;
}
.version-note {
  grid-column: 1/-1;
  font-size: 10px;
  color: var(--muted);
  padding-top: 10px;
}
/* Chinese has its own scale and rhythm rather than inheriting Latin italics. */
:lang(zh-CN) h2 {
  font-size: clamp(38px, 4.1vw, 60px);
  line-height: 1.35;
  letter-spacing: 0.01em;
}
:lang(zh-CN) h2 em {
  font-family: inherit;
  font-style: normal;
}
:lang(zh-CN) .section-body h2 {
  font-size: clamp(48px, 5vw, 72px);
}
:lang(zh-CN) .hero-subtitle {
  font-size: 24px;
  line-height: 1.5;
  letter-spacing: 0.01em;
}
:lang(zh-CN) .hero-lead {
  line-height: 1.9;
}
:lang(zh-CN) .forces-section h2 {
  font-size: 30px;
  line-height: 1.4;
}
:lang(zh-CN) .resources-section h2 {
  font-size: 46px;
}
:lang(zh-CN) .secondary-results h3 {
  font-size: 32px;
  line-height: 1.45;
}
:lang(zh-CN) .section-lead,
:lang(zh-CN) .prose-columns,
:lang(zh-CN) .interpretation p {
  line-height: 1.9;
}
@media (min-width: 1600px) {
  .hero h1 {
    font-size: 230px;
  }
  .cover-art img {
    max-height: 405px;
    object-fit: cover;
  }
}
@media (max-width: 1150px) {
  .aero-inspiration {
    gap: 5%;
    grid-template-columns: minmax(200px, 0.8fr) minmax(0, 1.3fr);
  }
  .aero-copy > p:first-child {
    font-size: 18px;
  }

  .desktop-nav {
    gap: 18px;
  }
  .wordmark-caption {
    display: none;
  }
  .hero h1 {
    font-size: 15.4vw;
  }
  .cover-deck {
    gap: 10%;
  }
  .section {
    padding-block: 88px;
  }

  .section-heading {
    gap: 5%;
  }
  .section-lead {
    flex-basis: 35%;
  }
  .forces-grid {
    gap: 6%;
  }
  .forces-grid dl > div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .results-layout {
    gap: 30px;
    grid-template-columns: 0.8fr 2fr;
  }

  .bar-row {
    grid-template-columns: 112px 1fr 44px;
    gap: 12px;
  }
  .chart-axis {
    margin-left: 124px;
    margin-right: 56px;
  }
  .secondary-results {
    gap: 5%;
  }
  .mini-row {
    grid-template-columns: 105px 1fr 37px 42px;
    gap: 8px;
  }
  .token-comparison article {
    padding: 28px;
  }
  .resources-section > .wrap {
    gap: 20px 30px;
  }
  .resources-section h2 {
    font-size: 50px;
  }
}
@media (max-width: 900px) {
  .aero-copy > p:first-child {
    font-size: 17px;
  }
  :lang(zh-CN) .aero-copy > p:first-child {
    font-size: 16px;
  }

  .desktop-nav {
    display: none;
  }
  .menu-button {
    min-width: 44px;
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 44px;
    padding: 0;
  }
  .site-header {
    min-height: 70px;
  }
  .header-actions {
    gap: 24px;
  }
  .hero {
    padding-top: 26px;
  }
  .hero h1 {
    margin: 27px 0;
  }
  .cover-deck {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6%;
  }
  .hero-subtitle {
    font-size: 23px;
  }
  .hero-lead {
    font-size: 14px;
  }

  .section-margin {
    display: flex;
    align-items: start;
    gap: 35px;
  }
  .section-margin > .eyebrow {
    padding-top: 8px;
    white-space: nowrap;
  }
  .chapter-nav {
    margin: 0;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    width: 100%;
    gap: 0 20px;
  }
  .chapter-nav a {
    min-height: 32px;
    font-size: 12px;
  }
  .section-body h2 {
    font-size: 72px;
  }
  .section-heading h2 {
    font-size: 58px;
  }
  .section-heading {
    align-items: start;
  }
  .section-lead {
    font-size: 14px;
    flex-basis: 37%;
  }
  .numbers-grid {
    gap: 22px;
  }
  .numbers-grid strong {
    font-size: 50px;
  }
  .numbers-grid > div > span {
    font-size: 12px;
  }
  .numbers-grid small {
    font-size: 11px;
  }
  .question-line {
    grid-template-columns: 1fr 2fr;
    gap: 24px;
  }
  .question-line p {
    font-size: 19px;
  }
  .image-pair {
    gap: 20px;
  }
  .image-heading a {
    font-size: 11px;
  }
  .reading-controls button {
    padding: 15px 12px;
    gap: 10px;
    font-size: 13px;
  }
  .interpretation h3 {
    font-size: 21px;
  }
  .force-question {
    font-size: 17px;
  }
  .forces-section .section-heading h2 {
    font-size: 28px;
  }
  .force-name h3 {
    font-size: 79px;
  }

  .results-layout {
    grid-template-columns: 0.75fr 2fr;
    gap: 28px;
  }
  .big-score {
    font-size: 92px;
  }
  .chart-top {
    flex-direction: column;
    gap: 14px;
    margin-bottom: 18px;
  }
  .metric-select {
    flex-direction: row;
    align-items: center;
    gap: 12px;
  }
  .chart-top h3 {
    max-width: none;
    font-size: 16px;
  }
  .bar-row {
    grid-template-columns: 105px 1fr 40px;
    gap: 10px;
    min-height: 70px;
  }
  .chart-axis {
    margin-left: 115px;
    margin-right: 50px;
  }
  .bar-label {
    font-size: 12px;
  }
  .bar-row strong {
    font-size: 12px;
  }
  .legend {
    gap: 10px;
  }
  .secondary-results {
    grid-template-columns: 1fr;
    gap: 45px;
  }
  .secondary-results article {
    max-width: none;
  }
  .secondary-results p {
    max-width: 650px;
  }
  .mini-row {
    grid-template-columns: 150px 1fr 44px 65px;
    gap: 18px;
    font-size: 12px;
  }
  .urban-gains {
    max-width: 550px;
  }
  .token-comparison article {
    padding: 25px;
  }
  .density-value {
    font-size: 80px;
  }
  .token-comparison dl > div {
    font-size: 12px;
    gap: 10px;
    align-items: baseline;
  }
  .token-comparison dt {
    max-width: 180px;
  }
  .token-caption {
    gap: 24px;
  }
  .resource-links h3 {
    font-size: 18px;
  }
  .resources-section h2 {
    font-size: 46px;
  }
  .site-footer {
    grid-template-columns: 1fr auto;
  }
  .site-footer > p {
    grid-column: 1;
    grid-row: 2;
  }
  .site-footer > a:last-of-type {
    grid-column: 2;
    grid-row: 1;
  }
  .version-note {
    padding-top: 0;
  }
  :lang(zh-CN) .hero-subtitle {
    font-size: 21px;
  }
  :lang(zh-CN) .section-heading h2 {
    font-size: 41px;
  }
  :lang(zh-CN) .section-body h2 {
    font-size: 62px;
  }
  :lang(zh-CN) .forces-section h2 {
    font-size: 26px;
  }
  :lang(zh-CN) .resources-section h2 {
    font-size: 37px;
  }
}
@media (max-width: 600px) {
  .aero-inspiration {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
    margin-bottom: 34px;
  }
  .aero-sketch {
    max-width: 280px;
  }
  .aero-copy > p:first-child {
    font-size: 16px;
    line-height: 1.8;
  }
  .aero-copy > .caption {
    font-size: 11px;
    margin-top: 14px;
  }

  :lang(zh-CN) .aero-copy > p:first-child {
    font-size: 15px;
  }

  :root {
    --gutter: 22px;
  }
  .site-header {
    min-height: 66px;
    gap: 12px;
  }
  .wordmark {
    font-size: 31px;
  }
  .header-actions {
    gap: 17px;
    font-size: 12px;
  }
  .paper-full {
    display: none;
  }
  .paper-short {
    display: inline;
  }
  .paper-link {
    gap: 12px;
    padding: 7px 0;
  }
  .menu-button {
    gap: 7px;
    font-size: 12px;
  }
  .language-button {
    min-width: 44px;
  }
  .hero {
    padding-top: 24px;
  }
  .cover-kicker {
    font-size: 9px;
    letter-spacing: 0.06em;
  }
  .hero h1 {
    font-size: 25vw;
    white-space: normal;
    line-height: 0.88;
    letter-spacing: -0.04em;
    margin: 32px 0 30px;
    max-width: 450px;
  }
  .hero-amp {
    font-size: 0.7em;
    margin-left: 0.06em;
  }
  .hero h1 em {
    display: block;
    text-align: right;
    margin-top: 5px;
  }
  .cover-deck {
    grid-template-columns: 1fr;
    gap: 18px;
    margin-bottom: 28px;
  }
  .hero-subtitle {
    font-size: 25px;
    line-height: 1.2;
  }
  .hero-lead {
    font-size: 14px;
    line-height: 1.75;
    max-width: 380px;
  }
  .cover-art img {
    height: 220px;
    object-fit: cover;
    object-position: 46% center;
  }
  .cover-art figcaption {
    font-size: 10px;
    align-items: start;
    gap: 25px;
    padding: 15px 0;
  }
  .cover-art figcaption > span {
    max-width: 190px;
  }
  .cover-art figcaption > a {
    font-size: 12px;
    gap: 12px;
    white-space: nowrap;
    min-height: 25px;
  }
  .section {
    padding-block: 65px;
  }

  .section-margin {
    display: block;
  }
  .section-margin > .eyebrow {
    font-size: 10px;
  }
  .chapter-nav {
    margin-top: 14px;
    gap: 5px 15px;
  }
  .chapter-nav a {
    font-size: 11px;
    grid-template-columns: 17px 1fr;
    gap: 6px;
  }
  .chapter-arrow {
    display: none;
  }
  .chapter-number {
    font-size: 9px;
  }
  .section-body h2 {
    font-size: 54px;
    line-height: 1;
    margin-bottom: 27px;
  }
  .prose-columns {
    grid-template-columns: 1fr;
    gap: 18px;
    font-size: 15px;
    line-height: 1.8;
  }

  .numbers-strip {
    padding-bottom: 60px;
  }
  .numbers-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px 22px;
    padding-top: 25px;
  }
  .numbers-grid strong {
    font-size: 50px;
    margin-bottom: 9px;
  }
  .numbers-grid > div > span {
    font-size: 12px;
  }
  .numbers-grid small {
    font-size: 10px;
    line-height: 1.6;
  }
  .section-heading {
    display: block;
    margin-bottom: 32px;
  }
  .section-heading .eyebrow {
    font-size: 10px;
    margin-bottom: 22px;
  }
  .section-heading h2 {
    font-size: 54px;
    line-height: 1.02;
  }
  .section-lead {
    max-width: none;
    font-size: 14px;
    line-height: 1.8;
    margin-top: 23px;
  }
  .example-section {
    padding-block: 62px;
  }
  .question-line {
    grid-template-columns: 1fr;
    gap: 12px;
    padding-block: 20px;
  }
  .question-line .eyebrow {
    font-size: 10px;
  }
  .question-line p {
    font-size: 18px;
  }
  .image-pair {
    gap: 28px;
    grid-template-columns: 1fr;
  }
  .image-heading {
    font-size: 12px;
  }
  .image-heading a {
    font-size: 11px;
  }
  .image-pair figcaption {
    font-size: 12px;
    margin-top: 10px;
  }
  .reading-controls {
    margin-top: 30px;
  }
  .reading-controls button {
    font-size: 11px;
    gap: 5px;
    min-height: 65px;
    align-items: start;
    flex-direction: column;
    padding: 11px 10px;
  }
  .reading-controls button > span:last-child {
    display: none;
  }
  .tab-number {
    font-size: 9px;
    opacity: 0.75;
  }
  .interpretation {
    grid-template-columns: 35px 1fr;
    gap: 15px;
    padding: 25px 0;
    min-height: 250px;
  }
  .relation-symbol {
    font-size: 42px;
  }
  .interpretation h3 {
    font-size: 18px;
    line-height: 1.4;
    margin-bottom: 10px;
  }
  .interpretation p {
    font-size: 13px;
    line-height: 1.8;
  }
  .example-section .caption {
    font-size: 10px;
    line-height: 1.8;
  }
  .forces-section {
    padding-block: 55px;
  }
  .forces-section > .wrap > .eyebrow {
    font-size: 10px;
    margin-bottom: 18px;
  }
  .forces-section .section-heading {
    margin-bottom: 35px;
  }
  .forces-section .section-heading h2 {
    font-size: 28px;
    line-height: 1.25;
  }
  .forces-grid {
    grid-template-columns: 1fr;
    gap: 38px;
  }
  .force-name h3 {
    font-size: 88px;
  }
  .force-name > span {
    font-size: 11px;
  }
  .force-question {
    font-size: 17px;
    margin: 18px 0 23px;
  }
  .forces-grid dl > div {
    grid-template-columns: 110px 1fr;
    gap: 16px;
    margin-top: 20px;
  }
  .forces-grid dt {
    font-size: 12px;
  }
  .forces-grid dd {
    font-size: 12px;
    line-height: 1.8;
  }
  .verification-note {
    font-size: 12px;
    gap: 16px;
    margin-top: 30px;
  }

  summary {
    font-size: 13px;
    padding-block: 18px;
  }
  summary > span:last-child {
    font-size: 22px;
  }
  .results-layout {
    grid-template-columns: 1fr;
    gap: 35px;
  }
  .result-callout {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 20px;
    padding-top: 0;
  }
  .result-callout > .eyebrow {
    grid-column: 1/-1;
    font-size: 10px;
  }
  .big-score {
    grid-column: 1;
    grid-row: 2/5;
    font-size: 83px;
    margin: 12px 0 0;
    align-self: center;
  }
  .result-callout > p {
    grid-column: 2;
    font-size: 10px;
    display: block;
    margin-bottom: 0;
    line-height: 1.6;
  }
  .result-callout > p:nth-of-type(1) {
    padding-top: 15px;
  }
  .delta {
    display: block;
    font-size: 20px;
  }
  .result-callout > p.score-unit {
    grid-column: 1;
    margin-top: 8px;
    font-size: 10px;
  }
  .legend {
    grid-column: 1/-1;
    margin-top: 20px;
    font-size: 10px;
  }
  .chart-top {
    display: flex;
    flex-direction: row;
    gap: 18px;
    margin-bottom: 18px;
    align-items: center;
  }
  .chart-top h3 {
    font-size: 14px;
    max-width: 165px;
  }
  .metric-select {
    display: flex;
    flex-direction: column;
    align-items: start;
    gap: 5px;
    font-size: 9px;
  }
  .metric-select select {
    min-width: 120px;
    font-size: 11px;
    height: 44px;
    width: 120px;
    padding-left: 7px;
  }
  .bar-row {
    grid-template-columns: 97px 1fr 37px;
    gap: 8px;
    min-height: 63px;
  }
  .bar-label {
    font-size: 11px;
  }
  .bar-label > span {
    font-size: 10px;
  }
  .bar-track {
    height: 27px;
  }
  .bar-row strong {
    font-size: 11px;
  }
  .chart-axis {
    margin: 8px 45px 0 105px;
    font-size: 9px;
  }
  .result-chart .caption {
    font-size: 11px;
    margin-top: 20px;
  }
  .results-table-details {
    margin-top: 30px;
  }
  .table-scroll table {
    font-size: 11px;
    min-width: 790px;
  }
  .table-scroll th,
  .table-scroll td {
    padding: 12px;
  }
  .table-scroll th:first-child {
    max-width: 120px;
    white-space: normal;
    min-width: 110px;
  }
  .table-hint {
    font-size: 10px;
  }
  .secondary-results {
    margin-top: 44px;
    gap: 40px;
  }
  .secondary-results .eyebrow {
    font-size: 10px;
  }
  .secondary-results h3 {
    font-size: 35px;
    margin: 16px 0;
  }
  .secondary-results p {
    font-size: 13px;
  }
  .mini-row {
    grid-template-columns: 98px 1fr 37px 43px;
    gap: 8px;
    font-size: 10px;
  }
  .mini-row strong {
    font-size: 11px;
  }
  .ablation-heading,
  .ablation-delta {
    font-size: 9px;
  }
  .urban-gains {
    gap: 12px;
    margin-block: 25px;
  }
  .urban-gains strong {
    font-size: 38px;
  }
  .urban-gains span {
    font-size: 10px;
  }
  .secondary-results .caption {
    font-size: 11px;
  }
  .analysis-meta {
    gap: 20px;
    font-size: 10px;
    align-items: start;
  }
  .sample-count {
    gap: 8px;
    white-space: normal;
    min-width: 105px;
  }
  .sample-count strong {
    font-size: 30px;
  }
  .analysis-meta p {
    font-size: 10px;
  }
  .token-comparison {
    grid-template-columns: 1fr;
  }
  .token-comparison article {
    padding: 25px;
  }
  .token-heading {
    font-size: 10px;
  }
  .token-heading .eyebrow {
    font-size: 10px;
  }
  .density-value {
    font-size: 85px;
    margin-top: 20px;
  }
  .density-value > span {
    font-size: 36px;
  }
  .token-comparison article > p {
    font-size: 12px;
  }
  .token-comparison dl > div {
    font-size: 12px;
    flex-wrap: wrap;
  }
  .token-caption {
    display: block;
    margin-top: 18px;
  }
  .token-caption p {
    font-size: 11px;
  }
  .token-caption a {
    margin-top: 14px;
    font-size: 11px;
  }
  .resources-section {
    padding-block: 55px;
  }
  .resources-section > .wrap {
    display: block;
  }
  .resources-section .eyebrow {
    font-size: 10px;
    margin-bottom: 20px;
  }
  .resources-section h2 {
    font-size: 54px;
    max-width: none;
    margin-bottom: 32px;
  }
  .resource-links > a {
    gap: 12px;
    grid-template-columns: 22px 1fr 22px;
    padding: 20px 0;
  }
  .resource-links h3 {
    font-size: 17px;
  }
  .resource-links p {
    font-size: 11px;
  }
  .resource-note {
    font-size: 10px;
    gap: 16px;
  }
  .resource-note button {
    font-size: 10px;
    min-height: 44px;
  }
  .site-footer {
    padding-block: 25px;
    gap: 15px;
  }
  .footer-brand {
    font-size: 28px;
  }
  .site-footer > p {
    font-size: 10px;
  }
  .site-footer > a:last-of-type {
    font-size: 10px;
  }
  .version-note {
    font-size: 9px;
    line-height: 1.8;
  }
  :lang(zh-CN) .hero-subtitle {
    font-size: 23px;
    line-height: 1.45;
  }
  :lang(zh-CN) .hero-lead {
    font-size: 13px;
  }
  :lang(zh-CN) .section-body h2 {
    font-size: 48px;
    line-height: 1.3;
  }
  :lang(zh-CN) .section-heading h2 {
    font-size: 37px;
    line-height: 1.35;
  }
  :lang(zh-CN) .forces-section h2 {
    font-size: 26px;
    line-height: 1.4;
  }
  :lang(zh-CN) .section-lead {
    font-size: 13px;
  }
  :lang(zh-CN) .prose-columns {
    font-size: 14px;
  }
  :lang(zh-CN) .secondary-results h3 {
    font-size: 29px;
  }
  :lang(zh-CN) .resources-section h2 {
    font-size: 39px;
  }
  :lang(zh-CN) .force-question {
    font-size: 16px;
  }
}
@media (max-width: 360px) {
  :lang(zh-CN) #story-title {
    font-size: 38px;
  }

  :root {
    --gutter: 18px;
  }
  .header-actions {
    gap: 12px;
  }
  .cover-kicker {
    font-size: 8px;
  }
  .hero h1 {
    font-size: 25.5vw;
  }
  .hero-subtitle {
    font-size: 23px;
  }
  .cover-art img {
    height: 190px;
  }
  .cover-art figcaption {
    gap: 16px;
  }
  .cover-art figcaption > span {
    max-width: 155px;
    font-size: 9px;
  }
  .section-body h2 {
    font-size: 48px;
  }
  .section-heading h2 {
    font-size: 47px;
  }
  .reading-controls button {
    font-size: 10px;
    padding: 10px 8px;
  }
  .forces-grid dl > div {
    grid-template-columns: 95px 1fr;
    gap: 12px;
  }
  .force-name h3 {
    font-size: 78px;
  }

  .big-score {
    font-size: 74px;
  }
  .chart-top h3 {
    font-size: 12px;
  }
  .bar-row {
    grid-template-columns: 87px 1fr 34px;
    gap: 6px;
  }
  .chart-axis {
    margin-left: 93px;
    margin-right: 40px;
  }
  .mini-row {
    grid-template-columns: 89px 1fr 33px 36px;
    gap: 6px;
    font-size: 9px;
  }
  .token-comparison article {
    padding: 22px;
  }
  .token-comparison dl > div {
    font-size: 11px;
  }
  :lang(zh-CN) .section-heading h2 {
    font-size: 32px;
  }
  :lang(zh-CN) .section-body h2 {
    font-size: 44px;
  }
  :lang(zh-CN) .forces-section h2 {
    font-size: 25px;
  }
}
/* Paper figures are reading spreads, with full-size originals one click away. */
.story-section {
  padding-top: 100px;
  padding-bottom: 72px;
}
.story-opening {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 7%;
}
.story-kicker {
  color: var(--accent);
  margin-bottom: 20px;
}
.story-opening .section-body h2 {
  font-size: clamp(48px, 4.9vw, 72px);
  line-height: 1.08;
}
.paper-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
  margin-top: 44px;
}
.paper-card {
  min-width: 0;
  border-top: 1px solid #bba99b;
  background: #f4e7df;
  display: flex;
  flex-direction: column;
}
.paper-gf {
  background: var(--blue);
  border-color: #b6c6cf;
}
.paper-card-head {
  padding: 24px 24px 20px;
}
.paper-meta {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 11px;
  color: var(--muted);
}
.paper-meta .eyebrow {
  color: var(--ink);
}
.paper-card h3 {
  margin-top: 14px;
  font-family: var(--display);
  font-size: 35px;
  letter-spacing: -0.015em;
}
.paper-frame {
  display: block;
  margin-inline: 20px;
  background: white;
  overflow: hidden;
  text-decoration: none;
}
.paper-frame:hover {
  text-decoration: none;
}
.paper-frame img {
  width: 100%;
  height: auto;
  aspect-ratio: 2.35;
  object-fit: contain;
  padding: 10px;
  transition: transform 0.55s cubic-bezier(0.16, 1, 0.3, 1);
}
.method-figures .paper-frame img {
  aspect-ratio: 1.95;
}
.paper-zoom-hint {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  min-height: 44px;
  padding: 8px 14px;
  border-top: 1px solid #e8e8e3;
  color: var(--accent);
  font-size: 12px;
}
.paper-zoom-hint > :last-child {
  font-size: 20px;
  transition: transform 0.25s;
}
.paper-frame:focus-visible .paper-zoom-hint {
  background: var(--blue);
}
@media (hover: hover) {
  .paper-frame:hover img {
    transform: scale(1.015);
  }
  .paper-frame:hover .paper-zoom-hint > :last-child {
    transform: translate(2px, -2px);
  }
}
.paper-card figcaption {
  padding: 22px 24px 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
  align-items: start;
}
.paper-caption {
  font-size: 14px;
  line-height: 1.75;
}
.paper-pdf {
  display: inline-flex;
  gap: 16px;
  align-items: center;
  font-size: 12px;
  min-height: 44px;
  padding-top: 12px;
  margin-top: auto;
  text-decoration: underline;
  text-underline-offset: 4px;
}
.story-interlude {
  padding-block: 64px 72px;
  text-align: center;
}
.story-connector {
  display: block;
  margin-bottom: 22px;
  font-size: 24px;
  color: var(--accent);
}
.story-interlude p {
  font-family: var(--display);
  font-size: clamp(28px, 3.1vw, 44px);
  line-height: 1.25;
  letter-spacing: -0.015em;
}
.story-interlude em {
  color: var(--accent);
}
.lineage-intro {
  border-top: 1px solid var(--line);
  padding-top: 56px;
}
.lineage-intro h2 {
  margin-bottom: 32px;
  max-width: 1000px;
}
/* A quiet reference to the earlier work and its official resources. */
.fba-resources {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px 64px;
  align-items: center;
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.fba-resource-intro h3 {
  margin: 10px 0 8px;
  font-family: var(--italic);
  font-size: clamp(26px, 2.6vw, 34px);
  line-height: 1.2;
  letter-spacing: 0;
}
.fba-resource-intro > p:not(.eyebrow) {
  max-width: 52ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}
.fba-resource-intro .fba-citation {
  margin-top: 6px;
  font-size: 11px;
}
.fba-resource-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 28px;
  align-items: center;
}
.fba-resource-links a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  font-size: 13px;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--line);
}
.fba-resource-links a:hover {
  text-decoration-color: currentColor;
}
@media (max-width: 760px) {
  .fba-resources {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    margin-top: 28px;
    padding-top: 24px;
  }
  .fba-resource-links {
    gap: 2px 24px;
  }
}
#figure-viewer {
  width: min(1440px, calc(100vw - 40px));
  max-width: none;
  max-height: calc(100dvh - 40px);
  padding: 0;
  border: 1px solid var(--line);
  color: var(--ink);
  background: #fffdfa;
  box-shadow: 0 24px 90px #172d2c33;
}
#figure-viewer::backdrop {
  background: #152523c9;
  backdrop-filter: blur(5px);
}
#figure-viewer[open] {
  display: flex;
  flex-direction: column;
}
.figure-viewer-head {
  display: flex;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  flex-shrink: 0;
}
.figure-viewer-head h2 {
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.4;
  letter-spacing: 0;
}
.figure-viewer-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.figure-viewer-actions button,
.figure-viewer-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  font-size: 12px;
  white-space: nowrap;
}
#figure-close {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}
#figure-close > :last-child {
  font-size: 22px;
  line-height: 1;
}
.figure-viewer-stage {
  padding: 16px;
  background: white;
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
}
.figure-viewer-stage img {
  margin: auto;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: calc(100dvh - 240px);
  object-fit: contain;
}
.figure-viewer-stage.is-zoomed img {
  width: var(--figure-width);
  max-width: none;
  max-height: none;
  margin: 0;
}
#figure-viewer-caption {
  padding: 16px 24px 20px;
  font-size: 12px;
  line-height: 1.65;
  flex-shrink: 0;
}
.site-header {
  transition:
    background-color 0.35s,
    box-shadow 0.35s;
}
.site-header.is-scrolled {
  background: #fcf1ebf2;
  backdrop-filter: blur(14px);
  box-shadow: 0 4px 24px #242d2b08;
}
:lang(zh-CN) .story-opening .section-body h2 {
  font-size: clamp(34px, 4.2vw, 60px);
  line-height: 1.4;
}
:lang(zh-CN) .paper-card h3 {
  font-size: 25px;
  line-height: 1.5;
}
:lang(zh-CN) .story-interlude p {
  font-size: clamp(23px, 2.7vw, 36px);
  line-height: 1.65;
}
:lang(zh-CN) .story-interlude em {
  font-family: inherit;
  font-style: normal;
}
@media (max-width: 1100px) {
  .story-opening {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 5%;
  }
  .story-opening .prose-columns {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .paper-grid {
    gap: 24px;
  }
  .paper-card h3 {
    font-size: 30px;
  }
}
@media (max-width: 900px) {
  .story-opening {
    display: block;
  }
  .story-opening .section-margin {
    margin-bottom: 36px;
  }
}
@media (max-width: 760px) {
  .story-opening {
    display: block;
  }
  .story-opening .section-margin {
    display: none;
  }
  .paper-grid {
    grid-template-columns: 1fr;
    gap: 28px;
    margin-top: 30px;
  }
  .story-section {
    padding-top: 64px;
    padding-bottom: 48px;
  }
  .story-opening .section-body h2 {
    font-size: clamp(38px, 8vw, 56px);
    margin-bottom: 26px;
  }
  .story-section .prose-columns {
    grid-template-columns: 1fr;
    gap: 20px;
    font-size: 15px;
  }
  .story-interlude {
    padding-block: 38px 46px;
  }
  .lineage-intro {
    padding-top: 40px;
  }
  .lineage-intro h2 {
    font-size: clamp(40px, 8.5vw, 58px);
    line-height: 1.1;
  }
  .paper-card-head {
    padding: 20px;
  }
  .paper-frame {
    margin-inline: 14px;
  }
  .paper-card figcaption {
    padding: 18px 20px;
  }
  .paper-card h3 {
    font-size: 32px;
  }
  .paper-caption {
    font-size: 13px;
  }
  #figure-viewer {
    width: calc(100vw - 16px);
    max-height: calc(100dvh - 16px);
  }
  .figure-viewer-head {
    display: block;
    padding: 14px;
  }
  .figure-viewer-head h2 {
    font-size: 15px;
  }
  .figure-viewer-actions {
    gap: 8px;
    margin-top: 12px;
    justify-content: space-between;
  }
  .figure-viewer-actions button,
  .figure-viewer-actions a {
    font-size: 11px;
    padding: 8px 10px;
  }
  .figure-viewer-stage {
    padding: 8px;
  }
  .figure-viewer-stage img {
    max-height: calc(100dvh - 280px);
  }
  #figure-viewer-caption {
    padding: 12px 14px;
    font-size: 11px;
    max-height: 130px;
    overflow-y: auto;
  }
  :lang(zh-CN) .lineage-intro h2 {
    font-size: 36px;
    line-height: 1.4;
  }
}
@media print {
  #figure-viewer {
    display: none !important;
  }
  .story-opening {
    display: block;
  }
  .paper-grid {
    break-inside: avoid;
  }
  .paper-zoom-hint {
    display: none;
  }
  .story-section {
    padding-top: 30px;
  }
}

/* Let the paper explain the method; the page supplies a calm reading frame. */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.method-section .method-heading {
  align-items: end;
  margin-bottom: 30px;
}
.method-heading h2 {
  font-family: var(--italic);
  font-size: clamp(44px, 4.7vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.018em;
}
.method-heading .section-lead {
  max-width: 380px;
  font-size: 15px;
}
.method-plate {
  margin: 0;
}
.method-plate-link {
  display: block;
  background: transparent;
  text-decoration: none;
}
.method-plate-link:hover {
  text-decoration: none;
}
.method-plate-link img {
  display: block;
  width: 100%;
  height: auto;
  padding: 14px;
}
.method-expand {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 20px;
  min-height: 44px;
  padding: 8px 18px;
  border-top: 1px solid #ebe6e0;
  color: var(--accent);
  font-size: 12px;
}
.method-expand > :last-child {
  font-size: 21px;
  transition: transform 0.25s;
}
.method-plate-link:hover .method-expand > :last-child {
  transform: translate(2px, -2px);
}
.method-plate-caption {
  display: grid;
  grid-template-columns: minmax(0, 900px) auto;
  gap: 20px 48px;
  justify-content: space-between;
  align-items: start;
  padding-top: 20px;
}
.method-plate-caption .paper-caption {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}
.method-original {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  min-height: 44px;
  font-size: 12px;
  white-space: nowrap;
  text-decoration: underline;
  text-underline-offset: 4px;
}
/* A wider classical serif and looser spacing give the brand room to breathe. */
.hero h1,
.force-name h3,
.wordmark,
.footer-brand {
  font-family: var(--italic);
}
.hero h1 {
  font-size: clamp(84px, 13.2vw, 190px);
  line-height: 1.04;
  letter-spacing: -0.018em;
}
.hero h1 em {
  letter-spacing: -0.02em;
}
.force-name {
  flex-wrap: wrap;
  gap: 10px 20px;
}
.force-name h3 {
  font-size: clamp(64px, 6.4vw, 92px);
  line-height: 1.1;
  letter-spacing: -0.01em;
}
.wordmark,
.footer-brand {
  letter-spacing: 0;
}
@media (max-width: 760px) {
  .method-section .method-heading {
    display: block;
  }
  .method-heading h2 {
    font-size: clamp(40px, 7.8vw, 56px);
  }
  .method-heading .section-lead {
    max-width: 520px;
    font-size: 14px;
    margin-top: 22px;
  }
  .method-plate-link img {
    padding: 4px;
  }
  .method-plate-caption {
    grid-template-columns: 1fr;
    gap: 6px;
    padding-top: 16px;
  }
  .method-plate-caption .paper-caption {
    font-size: 13px;
  }
  .method-original {
    justify-self: start;
  }
  :lang(zh-CN) .method-heading h2 {
    font-size: 34px;
    line-height: 1.4;
  }
}
@media (max-width: 600px) {
  .hero h1 {
    font-size: clamp(64px, 20vw, 112px);
    line-height: 1.02;
    letter-spacing: -0.015em;
  }
  .hero-amp {
    font-size: 0.77em;
  }
}
@media print {
  .method-plate {
    break-inside: avoid;
  }
  .method-expand {
    display: none;
  }
  .hero h1 {
    font-size: 86px;
  }
}

/* Blend white paper margins into the reading surface, outside the original viewer. */
.method-plate {
  isolation: isolate;
  background: var(--paper);
}
.method-plate-link img {
  padding: 0;
  mix-blend-mode: multiply;
}
.method-plate-caption {
  padding-top: 18px;
}
.method-plate-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.method-view {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  gap: 12px;
  font-size: 12px;
  white-space: nowrap;
  text-decoration: underline;
  text-underline-offset: 4px;
}
.method-view > :last-child {
  font-size: 18px;
}
.paper-card {
  isolation: isolate;
}
.paper-frame {
  background: transparent;
}
.paper-frame img {
  mix-blend-mode: multiply;
  padding: 0;
}
.paper-zoom-hint {
  border-top: 0;
  padding-inline: 0;
  justify-content: flex-end;
  gap: 14px;
}
@media (max-width: 760px) {
  .method-plate-caption {
    gap: 6px;
  }
  .method-plate-actions {
    gap: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}
@media print {
  body {
    font-size: 11px;
    background: white;
    color: black;
  }
  .site-header,
  .reading-progress,
  .skip-link,
  .chapter-nav,
  .reading-controls,
  .header-actions,
  .resource-note {
    display: none !important;
  }
  .wrap {
    width: 100%;
  }
  .hero h1 {
    font-size: 90px;
  }
  .section {
    padding-block: 35px;
  }
  .cover-art img {
    max-height: 220px;
  }
  .section-heading h2 {
    font-size: 36px;
  }
  .example-section {
    background: white;
    color: black;
  }
  .example-section h2 em,
  .example-section p,
  .image-pair figcaption {
    color: black;
  }
  .image-pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .image-heading {
    color: black;
  }
  .interpretation[hidden] {
    display: grid !important;
  }
  .interpretation {
    min-height: 0;
  }
  .forces-grid,
  .token-comparison {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .force-name h3 {
    font-size: 60px;
  }
  .section-heading,
  .results-layout {
    break-inside: avoid;
  }
  .resources-section {
    background: white;
  }
  .section-lead {
    font-size: 12px;
  }
  a {
    text-decoration: none;
  }
  .version-note {
    font-size: 9px;
  }
}

/* Compact experimental tables use the existing results disclosure. */
.experiment-updates table {
  min-width: 600px;
}