:root {
  --paper: #f1eee5;
  --paper-warm: #e8e1d3;
  --paper-light: #f8f6f0;
  --ink: #171b18;
  --ink-soft: #4e554f;
  --forest: #173c32;
  --forest-deep: #0f2b25;
  --sage: #a6b7a2;
  --moss: #6f8169;
  --copper: #a55234;
  --line: rgba(23, 27, 24, 0.2);
  --line-light: rgba(244, 241, 232, 0.22);
  --serif: "Newsreader", Iowan Old Style, Baskerville, "Times New Roman", serif;
  --sans: "DM Sans", Avenir, Helvetica, Arial, sans-serif;
  --shell: min(1280px, calc(100vw - 64px));
  --radius: 2px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(23, 27, 24, 0.025) 1px, transparent 1px) 0 0 / 100% 12px,
    var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  width: 100%;
  max-width: 100%;
  background: #d6d0c4;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: var(--paper-light);
  background: var(--forest-deep);
  transform: translateY(-160%);
  transition: transform 160ms ease;
}

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

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

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 76px;
  padding: 12px max(32px, calc((100vw - 1280px) / 2));
  border-bottom: 1px solid transparent;
  background: rgba(241, 238, 229, 0.86);
  backdrop-filter: blur(14px);
  transition: border-color 180ms ease, background 180ms ease;
}

.site-header.is-scrolled {
  border-color: var(--line);
  background: rgba(241, 238, 229, 0.96);
}

.wordmark {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
}

.wordmark-mark {
  position: relative;
  display: block;
  width: 30px;
  height: 30px;
  border: 1px solid var(--ink);
  border-radius: 50%;
}

.wordmark-mark::before,
.wordmark-mark::after {
  position: absolute;
  content: "";
  border: 1px solid var(--ink);
  border-radius: 50%;
}

.wordmark-mark::before {
  inset: 5px;
}

.wordmark-mark::after {
  inset: 10px;
  background: var(--copper);
  border-color: var(--copper);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.site-nav a {
  position: relative;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: -7px;
  left: 0;
  height: 1px;
  background: var(--copper);
  content: "";
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.language-toggle {
  display: inline-flex;
  gap: 2px;
  width: max-content;
  padding: 2px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(248, 246, 240, 0.55);
}

.language-option {
  min-width: 31px;
  padding: 4px 8px 3px;
  border-radius: 999px;
  color: var(--ink);
  font-size: 10px;
  font-weight: 650;
  line-height: 1.5;
  letter-spacing: 0.08em;
  text-align: center;
  text-decoration: none;
  transition: background 160ms ease, color 160ms ease;
}

.language-option:hover,
.language-option:focus-visible {
  background: var(--paper-warm);
}

.language-option.is-active {
  color: var(--paper-light);
  background: var(--ink);
}

.site-nav .language-option::after {
  display: none;
}

html[lang="vi"] body {
  font-feature-settings: "kern" 1;
}

html[lang="vi"] .hero h1,
html[lang="vi"] .section-intro h2,
html[lang="vi"] .research-heading h2,
html[lang="vi"] .outcomes-heading h2,
html[lang="vi"] .condition-heading h2,
html[lang="vi"] .boundary-grid h2,
html[lang="vi"] .next-card h2 {
  letter-spacing: -0.025em;
}

html[lang="vi"] .hero h1 {
  line-height: 0.94;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 11px;
  border: 0;
  color: var(--ink);
  background: transparent;
}

.nav-toggle span:not(.sr-only) {
  display: block;
  width: 22px;
  height: 1px;
  margin: 6px 0;
  background: currentColor;
  transition: transform 180ms ease;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(320px, 0.75fr);
  gap: clamp(48px, 7vw, 112px);
  align-items: end;
  min-height: calc(100vh - 76px);
  padding-block: clamp(76px, 10vw, 148px) 72px;
}

.eyebrow {
  margin: 0 0 24px;
  color: var(--copper);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.hero .eyebrow {
  display: flex;
  gap: 22px;
  align-items: center;
}

.hero .eyebrow span + span {
  color: var(--ink-soft);
}

.hero .eyebrow span + span::before {
  display: inline-block;
  width: 28px;
  height: 1px;
  margin-right: 22px;
  background: var(--line);
  content: "";
  vertical-align: middle;
}

.hero h1,
.section-intro h2,
.research-heading h2,
.outcomes-heading h2,
.boundary-grid h2,
.next-card h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: -0.035em;
}

.hero h1 {
  max-width: 920px;
  font-size: clamp(66px, 8.4vw, 130px);
  line-height: 0.87;
}

.hero-lede {
  max-width: 700px;
  margin: 40px 0 0;
  color: var(--ink-soft);
  font-size: clamp(18px, 1.6vw, 23px);
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  gap: 28px;
  align-items: center;
  margin-top: 40px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 12px 20px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: color 180ms ease, background 180ms ease, transform 180ms ease;
}

.button-primary {
  color: var(--paper-light);
  background: var(--forest);
}

.button-primary:hover {
  background: var(--forest-deep);
  transform: translateY(-2px);
}

.text-link {
  font-size: 14px;
  font-weight: 600;
}

.text-link span {
  display: inline-block;
  margin-left: 6px;
  transition: transform 180ms ease;
}

.text-link:hover span {
  transform: translate(3px, 3px);
}

.hero-index {
  position: relative;
  overflow: hidden;
  min-height: 520px;
  padding: 32px;
  color: var(--paper-light);
  background: var(--forest);
}

.hero-index::after {
  position: absolute;
  right: -120px;
  bottom: -120px;
  width: 330px;
  height: 330px;
  border: 1px solid rgba(241, 238, 229, 0.2);
  border-radius: 50%;
  content: "";
}

.index-label {
  position: relative;
  z-index: 2;
  margin: 0 0 72px;
  color: var(--sage);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero-index dl {
  position: relative;
  z-index: 2;
  margin: 0;
}

.hero-index dl > div {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 20px;
  align-items: baseline;
  padding: 16px 0;
  border-top: 1px solid var(--line-light);
}

.hero-index dt {
  font-family: var(--serif);
  font-size: 46px;
  font-variant-numeric: lining-nums tabular-nums;
  line-height: 1;
}

.hero-index dd {
  margin: 0;
  color: #d2dbd1;
  font-size: 13px;
  line-height: 1.35;
}

.index-note {
  position: absolute;
  z-index: 2;
  right: 32px;
  bottom: 28px;
  left: 32px;
  margin: 0;
  color: var(--sage);
  font-family: var(--serif);
  font-size: 18px;
  font-style: italic;
  line-height: 1.3;
}

.contour {
  position: absolute;
  top: -32px;
  right: -86px;
  width: 300px;
  height: 300px;
  opacity: 0.24;
}

.contour span {
  position: absolute;
  border: 1px solid var(--sage);
  border-radius: 47% 53% 60% 40% / 42% 52% 48% 58%;
}

.contour span:nth-child(1) { inset: 0; }
.contour span:nth-child(2) { inset: 28px; transform: rotate(12deg); }
.contour span:nth-child(3) { inset: 58px; transform: rotate(-9deg); }
.contour span:nth-child(4) { inset: 89px; transform: rotate(18deg); }
.contour span:nth-child(5) { inset: 122px; transform: rotate(-15deg); }

.section-rule {
  border-top: 1px solid var(--line);
}

.purpose {
  display: grid;
  grid-template-columns: 84px minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: clamp(28px, 5vw, 76px);
  padding-block: 96px 136px;
}

.section-number {
  padding-top: 8px;
  color: var(--copper);
  font-family: var(--serif);
  font-size: 18px;
  font-variant-numeric: tabular-nums;
}

.section-intro h2,
.outcomes-heading h2 {
  font-size: clamp(48px, 6vw, 88px);
  line-height: 0.98;
}

.purpose-body {
  padding-top: 54px;
  color: var(--ink-soft);
}

.purpose-body p {
  margin: 0 0 24px;
}

.purpose-body .purpose-lead {
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(25px, 2.5vw, 37px);
  line-height: 1.25;
}

.research-panel {
  position: relative;
  overflow: hidden;
  padding-block: 128px;
  color: var(--paper-light);
  background: var(--forest-deep);
}

.research-panel::before {
  position: absolute;
  top: -260px;
  left: -180px;
  width: 720px;
  height: 720px;
  border: 1px solid rgba(166, 183, 162, 0.1);
  border-radius: 50%;
  box-shadow:
    0 0 0 50px rgba(166, 183, 162, 0.025),
    0 0 0 110px rgba(166, 183, 162, 0.02),
    0 0 0 190px rgba(166, 183, 162, 0.015);
  content: "";
}

.research-panel .section-shell {
  position: relative;
}

.eyebrow-light {
  color: #bdcbb9;
}

.research-heading {
  max-width: 980px;
  padding-bottom: 80px;
}

.research-heading h2,
.boundary-grid h2 {
  max-width: 800px;
  font-size: clamp(52px, 6.2vw, 92px);
  line-height: 0.95;
}

.section-note {
  margin: 22px 0 0;
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.section-note-light {
  color: #9eafa1;
}

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

.publication {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr) 138px;
  gap: 32px;
  padding: 48px 0 54px;
  border-bottom: 1px solid var(--line-light);
}

.publication-order {
  color: var(--sage);
  font-family: var(--serif);
  font-size: 16px;
}

.publication-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-bottom: 22px;
  color: #9eafa1;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.publication-meta span + span::before {
  margin-right: 18px;
  color: #627b70;
  content: "·";
}

.publication h3 {
  max-width: 900px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(28px, 3vw, 42px);
  font-weight: 400;
  line-height: 1.12;
}

.publication-summary {
  display: grid;
  grid-template-columns: minmax(170px, 0.28fr) minmax(0, 1fr);
  gap: 32px;
  align-items: end;
  max-width: 820px;
  margin-top: 30px;
}

.publication-sample {
  margin: 0;
  color: var(--paper-light);
  font-family: var(--serif);
  font-size: clamp(32px, 3.2vw, 46px);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.publication-sample span {
  display: block;
  margin-bottom: 6px;
  color: #9eafa1;
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.publication-finding {
  margin: 0;
  color: #d7dfd7;
  font-size: 17px;
}

.publication-citation {
  margin: 18px 0 0;
  color: #95a69a;
  font-size: 12px;
}

.publication-links {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: flex-start;
  padding-top: 42px;
}

.publication-links a {
  color: #dbe3db;
  font-size: 12px;
  font-weight: 600;
  text-decoration-color: #71877b;
}

.outcomes {
  padding-block: 136px;
}

.outcomes-heading {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: clamp(28px, 5vw, 76px);
  align-items: end;
  padding-top: 88px;
}

.condition-block {
  max-width: 1060px;
  margin-top: 150px;
  margin-inline: auto;
}

.condition-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.45fr);
  gap: 48px;
  align-items: end;
  margin-bottom: 64px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--ink);
}

.condition-kicker {
  margin: 0 0 6px;
  color: var(--copper);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.condition-heading h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(44px, 5vw, 72px);
  font-weight: 500;
  line-height: 1;
}

.condition-heading > p {
  margin: 0 0 8px;
  color: var(--ink-soft);
  font-size: 14px;
}

.case {
  margin-bottom: 116px;
}

.case-header {
  display: flex;
  gap: 32px;
  align-items: end;
  justify-content: space-between;
  margin-bottom: 24px;
}

.case-code {
  margin: 0 0 5px;
  color: var(--copper);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.case h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(30px, 3.4vw, 50px);
  font-weight: 500;
  line-height: 1.05;
}

.case-interval {
  margin: 0 0 4px;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 20px;
  font-style: italic;
  white-space: nowrap;
}

.comparison {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  padding: 2px;
  background: var(--ink);
}

.timepoint {
  min-width: 0;
  margin: 0;
  background: var(--paper-light);
}

.timepoint figcaption {
  display: flex;
  justify-content: space-between;
  min-height: 50px;
  padding: 14px 16px;
  border-bottom: 1px solid rgba(23, 27, 24, 0.15);
  font-size: 12px;
}

.timepoint figcaption span:first-child {
  font-weight: 600;
}

.timepoint figcaption span:last-child {
  color: var(--ink-soft);
}

.timepoint > img,
.photo-pair {
  height: clamp(300px, 30vw, 440px);
}

.timepoint > img {
  padding: 10px;
  background: var(--paper-warm);
  object-fit: contain;
  object-position: center center;
}

.photo-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  padding: 0;
  background: var(--paper-warm);
}

.photo-pair img {
  height: 100%;
  padding: 8px;
  background: var(--paper-warm);
  object-fit: contain;
  object-position: center center;
}

.case-featured .timepoint > img,
.case-featured .photo-pair {
  height: clamp(320px, 32vw, 440px);
}

.case-copy {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.42fr);
  gap: 48px;
  padding: 28px 0 0 50%;
}

.case-copy > p:first-child {
  grid-column: 1 / -1;
  max-width: 840px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(21px, 2vw, 29px);
  line-height: 1.3;
}

.photo-note {
  grid-column: 1 / -1;
  margin: -18px 0 0;
  color: var(--ink-soft);
  font-size: 12px;
}

.condition-aa {
  margin-top: 196px;
}

.condition-aa .condition-heading {
  border-color: var(--copper);
}

.history-note {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 28px;
  max-width: 720px;
  margin-top: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--copper);
  border-bottom: 1px solid var(--copper);
}

.history-note span {
  color: var(--copper);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.history-note p {
  margin: 0;
  font-size: 15px;
}

.boundary-panel {
  padding-block: 128px;
  color: var(--paper-light);
  background: var(--copper);
}

.boundary-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(60px, 9vw, 140px);
}

.boundary-grid .eyebrow {
  color: #ead4c9;
}

.boundary-grid h2 {
  max-width: 600px;
}

.boundary-columns {
  border-top: 1px solid rgba(248, 246, 240, 0.35);
}

.boundary-columns article {
  display: grid;
  grid-template-columns: 48px 160px 1fr;
  gap: 24px;
  padding: 28px 0 32px;
  border-bottom: 1px solid rgba(248, 246, 240, 0.35);
}

.boundary-number,
.boundary-columns h3,
.boundary-columns article > p:last-child {
  margin: 0;
}

.boundary-number {
  color: #ead4c9;
  font-family: var(--serif);
}

.boundary-columns h3 {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 500;
}

.boundary-columns article > p:last-child {
  color: #f1dfd7;
  font-size: 14px;
}

.next-section {
  padding-block: 136px;
}

.next-card {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  gap: 72px;
  align-items: end;
  padding: clamp(36px, 6vw, 80px);
  background: var(--paper-warm);
}

.next-card h2 {
  max-width: 820px;
  font-size: clamp(48px, 6vw, 84px);
  line-height: 0.98;
}

.next-card > p {
  max-width: 460px;
  margin: 0 0 8px;
  color: var(--ink-soft);
}

.site-footer {
  padding-block: 72px 28px;
  color: #ccd6cd;
  background: var(--forest-deep);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px minmax(260px, 0.5fr);
  gap: 72px;
  padding-bottom: 72px;
}

.footer-grid > div {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-title {
  margin: 0 0 18px;
  color: var(--paper-light);
  font-family: var(--serif);
  font-size: clamp(34px, 4vw, 56px);
  line-height: 0.95;
}

.footer-grid p {
  max-width: 430px;
  margin-top: 0;
  font-size: 13px;
}

.footer-label {
  margin-bottom: 14px;
  color: #829589;
  font-size: 10px !important;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-grid a {
  margin-bottom: 8px;
  font-size: 13px;
}

.footer-grid .language-toggle {
  margin-top: 6px;
  border-color: var(--line-light);
  background: rgba(248, 246, 240, 0.06);
}

.footer-grid .language-option {
  margin-bottom: 0;
  color: #ccd6cd;
  font-size: 10px;
}

.footer-grid .language-option:hover,
.footer-grid .language-option:focus-visible {
  color: var(--forest-deep);
  background: var(--paper-warm);
}

.footer-grid .language-option.is-active {
  color: var(--forest-deep);
  background: var(--paper-light);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--line-light);
  color: #85978b;
  font-size: 11px;
}

[data-reveal] {
  opacity: 1;
  transform: none;
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 620ms ease, transform 620ms ease;
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1020px) {
  :root {
    --shell: min(100% - 48px, 920px);
  }

  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 0.58fr);
    gap: 44px;
    min-height: auto;
    padding-top: 100px;
  }

  .site-nav {
    gap: 18px;
  }

  .site-nav a {
    font-size: 12px;
  }

  .hero h1 {
    font-size: clamp(66px, 9.5vw, 94px);
  }

  .hero-index {
    min-height: 480px;
    padding: 24px;
  }

  .index-note {
    right: 24px;
    left: 24px;
  }

  .purpose,
  .outcomes-heading {
    grid-template-columns: 54px minmax(0, 1fr);
  }

  .purpose-body,
  .outcomes-heading > p {
    grid-column: 2;
    padding-top: 0;
  }

  .publication {
    grid-template-columns: 38px minmax(0, 1fr);
  }

  .publication-links {
    grid-column: 2;
    flex-direction: row;
    padding-top: 0;
  }

  .condition-heading {
    grid-template-columns: 1fr 280px;
  }

  .case-copy {
    padding-left: 30%;
  }

  .boundary-grid {
    grid-template-columns: 1fr;
    gap: 64px;
  }

  .boundary-grid h2 {
    max-width: 740px;
  }

  .next-card {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 760px) {
  :root {
    --shell: calc(100% - 32px);
  }

  html {
    scroll-padding-top: 72px;
  }

  .site-header {
    min-height: 68px;
    padding: 10px 16px;
  }

  .nav-toggle {
    display: block;
  }

  .nav-toggle[aria-expanded="true"] span:nth-of-type(2) {
    transform: translateY(3.5px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] span:nth-of-type(3) {
    transform: translateY(-3.5px) rotate(-45deg);
  }

  .site-nav {
    position: absolute;
    top: 68px;
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    gap: 0;
    align-items: stretch;
    padding: 10px 16px 20px;
    border-bottom: 1px solid var(--line);
    background: rgba(241, 238, 229, 0.99);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 13px 2px;
    border-bottom: 1px solid var(--line);
    font-size: 14px;
  }

  .site-nav .language-toggle {
    align-self: flex-start;
    margin-top: 12px;
  }

  .site-nav .language-option {
    min-width: 42px;
    padding: 7px 12px 6px;
    border: 0;
    border-radius: 999px;
    font-size: 12px;
    letter-spacing: 0.08em;
  }

  .site-nav a::after {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 64px;
    padding-block: 84px 64px;
  }

  .hero h1 {
    max-width: 650px;
    font-size: clamp(58px, 17vw, 98px);
    line-height: 0.88;
  }

  .hero-lede {
    margin-top: 30px;
    font-size: 18px;
  }

  .hero-actions {
    flex-wrap: wrap;
    margin-top: 32px;
  }

  .hero-index {
    min-height: 500px;
  }

  .purpose,
  .outcomes-heading {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .section-number {
    padding-top: 0;
  }

  .purpose {
    padding-block: 72px 96px;
  }

  .purpose-body {
    grid-column: 1;
  }

  .purpose-body {
    margin-top: 18px;
  }

  .research-panel,
  .boundary-panel {
    padding-block: 92px;
  }

  .research-heading {
    padding-bottom: 58px;
  }

  .publication {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 14px;
    padding-block: 38px 42px;
  }

  .publication-meta {
    display: grid;
    gap: 3px;
  }

  .publication-meta span + span::before {
    display: none;
  }

  .publication h3 {
    font-size: 28px;
  }

  .publication-finding {
    font-size: 15px;
  }

  .publication-summary {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 20px;
    margin-top: 24px;
  }

  .publication-links {
    flex-wrap: wrap;
  }

  .outcomes {
    padding-block: 96px;
  }

  .outcomes-heading {
    padding-top: 64px;
  }

  .condition-block,
  .condition-aa {
    margin-top: 104px;
  }

  .condition-heading {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .condition-heading > p {
    max-width: 520px;
  }

  .case {
    margin-bottom: 88px;
  }

  .case-header {
    align-items: flex-start;
  }

  .case-interval {
    font-size: 16px;
    white-space: normal;
    text-align: right;
  }

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

  .timepoint > img,
  .photo-pair,
  .case-featured .timepoint > img,
  .case-featured .photo-pair {
    height: min(88vw, 500px);
  }

  .case-copy {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px 0 0;
  }

  .case-copy > p:first-child,
  .photo-note,
  .history-note {
    grid-column: 1;
  }

  .photo-note {
    margin-top: -10px;
  }

  .history-note {
    grid-template-columns: 90px 1fr;
  }

  .boundary-columns article {
    grid-template-columns: 38px 1fr;
    gap: 14px;
  }

  .boundary-columns article > p:last-child {
    grid-column: 2;
  }

  .next-section {
    padding-block: 92px;
  }

  .next-card {
    padding: 32px 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 42px;
    padding-bottom: 52px;
  }
}

@media (max-width: 420px) {
  .hero .eyebrow {
    gap: 10px;
  }

  .hero .eyebrow span + span::before {
    width: 16px;
    margin-right: 10px;
  }

  .hero h1 {
    font-size: clamp(53px, 16vw, 72px);
  }

  .hero-actions {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-index dl > div {
    grid-template-columns: 72px 1fr;
  }

  .section-intro h2,
  .outcomes-heading h2,
  .research-heading h2,
  .boundary-grid h2,
  .next-card h2 {
    font-size: 46px;
  }

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

  .publication-order,
  .publication-links {
    grid-column: 1;
  }

  .publication-summary {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .case-header {
    flex-direction: column;
    gap: 10px;
  }

  .case-interval {
    text-align: left;
  }

  .photo-pair {
    grid-template-columns: 1fr 1fr;
  }

  .timepoint > img,
  .photo-pair,
  .case-featured .timepoint > img,
  .case-featured .photo-pair {
    height: 88vw;
    max-height: 430px;
  }

  .timepoint figcaption {
    min-height: 58px;
    font-size: 11px;
  }

  .footer-bottom {
    gap: 12px;
    align-items: flex-start;
    flex-direction: column;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* Shared site typography and palette; clinical content and photo framing stay intact. */
@font-face{font-family:Inter;src:url('/fonts/inter-var-latin.woff2') format('woff2');font-style:normal;font-weight:100 900;font-display:swap}
@font-face{font-family:Inter;src:url('/fonts/inter-var-vietnamese.woff2') format('woff2');font-style:normal;font-weight:100 900;font-display:swap;unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
:root{--paper:#fff;--paper-warm:#eef5fa;--paper-light:#f5f9fc;--ink:#102f4d;--ink-soft:#4f6373;--forest:#17659c;--forest-deep:#102f4d;--sage:#b5d8f2;--moss:#526f86;--copper:#17659c;--line:#cbd9e3;--line-strong:#a7becf;--line-light:#49657d;--serif:Inter,system-ui,sans-serif;--sans:Inter,system-ui,sans-serif;--shell:min(1080px,calc(100% - 64px));--link:#17659c;--panel:#102f4d;--panel-text:#e8f2fa;--panel-muted:#b5c8d8;color-scheme:light}
[data-theme=dark]{--paper:#0c1c2b;--paper-warm:#132b40;--paper-light:#132b40;--ink:#e8f2fa;--ink-soft:#b5c8d8;--forest:#65b8f8;--forest-deep:#0c1c2b;--sage:#b5d8f2;--copper:#65b8f8;--line:#344e64;--line-strong:#56718a;--link:#65b8f8;--panel:#132b40;color-scheme:dark}
body{background:var(--paper);overflow-wrap:anywhere;-webkit-font-smoothing:antialiased}
a{color:var(--link)}
.site-header,.site-header.is-scrolled{background:var(--paper);border-bottom:1px solid var(--line);backdrop-filter:none;padding:12px max(32px,calc((100vw - 1080px)/2));gap:1.25rem}
.wordmark{font-size:.88rem;text-transform:none;letter-spacing:-.02em;line-height:1.25;color:var(--ink);flex-shrink:0}.wordmark-mark{display:none}
.site-nav{gap:1.1rem}.site-nav a{font-size:.82rem}.header-controls{display:flex;align-items:center;gap:.5rem}.theme-toggle{display:inline-grid;place-items:center;width:40px;height:40px;flex-shrink:0;border:1px solid var(--line);border-radius:50%;background:transparent;color:var(--ink);cursor:pointer;font:1.1rem var(--sans)}
.language-toggle{background:var(--paper-warm)}.language-option.is-active{background:var(--ink);color:var(--paper)}
.hero{min-height:0;grid-template-columns:minmax(0,1.6fr) minmax(260px,.8fr);gap:3rem;align-items:center;padding-block:3rem 2.5rem}
.eyebrow{font-size:.73rem;letter-spacing:.07em;margin-bottom:.8rem}.hero h1,html[lang=vi] .hero h1{font-size:clamp(2rem,4vw,3rem);font-weight:600;line-height:1.15;letter-spacing:-.035em}.hero-lede{font-size:1.05rem;line-height:1.65;margin-top:1.1rem;max-width:60ch}.hero-actions{margin-top:1.2rem;gap:1rem;flex-wrap:wrap}.button{min-height:44px;padding:.6rem 1rem;border-radius:3px}.button-primary{background:#17659c;color:#fff}.button-primary:hover{background:#102f4d;transform:none}
.hero-index{min-height:0;padding:1.35rem;background:var(--paper-warm);color:var(--ink);border-left:3px solid #65b8f8}.hero-index::after,.contour,.research-panel::before{display:none}.index-label{margin-bottom:1rem;color:var(--link)}.hero-index dl>div{grid-template-columns:3.6rem 1fr;gap:1rem;padding:.7rem 0;border-color:var(--line)}.hero-index dt{font-size:1.8rem;font-weight:600}.hero-index dd{font-size:.85rem;color:var(--ink-soft)}.index-note{position:static;margin:.8rem 0 0;color:var(--ink-soft);font-size:.85rem;font-style:normal;line-height:1.55}
.purpose{grid-template-columns:2rem minmax(0,1fr) minmax(0,1fr);gap:1.5rem;padding-block:2.5rem}.purpose-body{padding-top:0}.purpose-body p{margin-bottom:.8rem}.purpose-body .purpose-lead{font-size:1.1rem;line-height:1.5}.section-number{font-size:.85rem;padding-top:.15rem}
.section-intro h2,.outcomes-heading h2,.research-heading h2,.boundary-grid h2,.next-card h2{font-size:clamp(1.4rem,2.5vw,2rem);font-weight:600;line-height:1.25;letter-spacing:-.025em}
.research-panel,.boundary-panel{padding-block:2.75rem;background:var(--panel);color:var(--panel-text)}.research-heading{padding-bottom:1.5rem;max-width:52rem}.eyebrow-light,.section-note-light,.publication-meta,.publication-sample span,.publication-citation{color:var(--panel-muted)}.section-note{font-size:.8rem;letter-spacing:0;text-transform:none;margin-top:.75rem;font-weight:500}
.publication{padding:1.5rem 0;gap:1.25rem;grid-template-columns:2rem minmax(0,1fr) 7rem}.publication-order{font-size:.85rem}.publication-meta{font-size:.72rem;letter-spacing:.025em;margin-bottom:.6rem}.publication h3{font-size:1.2rem;line-height:1.4;font-weight:500}.publication-summary{margin-top:1rem;gap:1.5rem}.publication-sample{font-size:1.7rem;color:var(--panel-text);font-weight:600}.publication-finding{font-size:.95rem;color:var(--panel-text)}.publication-citation{font-size:.8rem;margin-top:.8rem}.publication-links{padding-top:1.75rem;gap:.7rem}.publication-links a{font-size:.85rem;color:#b5d8f2;text-decoration-color:#65b8f8}
.outcomes{padding-block:2.5rem}.outcomes-heading{grid-template-columns:2rem 1fr;gap:1.5rem;padding-top:1.5rem}.condition-block,.condition-aa{margin-top:2.5rem}.condition-heading{gap:1.5rem;margin-bottom:1.5rem;padding-bottom:1rem}.condition-heading h2{font-size:1.6rem;line-height:1.3;font-weight:600}.condition-kicker{font-size:.73rem;letter-spacing:.04em}.case{margin-bottom:2.75rem}.case-header{margin-bottom:1rem;gap:1rem}.case h3{font-size:1.25rem;font-weight:600;line-height:1.4}.case-interval{font-size:.9rem;font-style:normal}.case-code{font-size:.75rem;letter-spacing:.04em}.case-copy{padding:1rem 0 0;gap:.8rem;grid-template-columns:1fr;max-width:75ch}.case-copy>p:first-child{font-size:1rem;line-height:1.6}.photo-note{margin:0;font-size:.85rem}.history-note{margin-top:.3rem;padding:.8rem 0;gap:1rem}.history-note p{font-size:.9rem}
/* Preserve every full photograph, its ordering, and the neutral image mount. */
.timepoint>img,.photo-pair,.photo-pair img{background:#eef1f3}.timepoint figcaption{border-color:var(--line);gap:.5rem}.comparison{background:var(--line)}
.boundary-grid{grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:2rem}.boundary-grid .eyebrow,.boundary-number{color:var(--panel-muted)}.boundary-columns article{grid-template-columns:1.5rem minmax(0,1fr);gap:.6rem 1rem;padding:1.1rem 0}.boundary-columns h3{font-size:1rem;font-weight:600}.boundary-columns article>p:last-child{grid-column:2;color:var(--panel-text);font-size:.9rem;line-height:1.65}.next-section{padding-block:2.5rem}.next-card{padding:1.5rem;gap:2rem;grid-template-columns:1fr 1fr}.next-card>p{font-size:.95rem}.site-footer{background:var(--paper);color:var(--ink-soft);padding-block:2rem 1rem;border-top:1px solid var(--line)}.footer-grid{gap:2rem;padding-bottom:1.5rem}.footer-title{color:var(--ink);font-size:1.2rem;line-height:1.4;font-weight:600}.footer-label,.footer-bottom{color:var(--ink-soft)}.footer-bottom{border-color:var(--line)}.footer-grid .language-option{color:var(--ink)}.footer-grid .language-option.is-active{color:var(--paper);background:var(--ink)}
.js [data-reveal]{opacity:1;transform:none;transition:none}
@media(max-width:1020px){.site-nav{gap:.7rem}.site-nav a{font-size:.76rem}.hero{gap:2rem}.publication{grid-template-columns:2rem 1fr}.publication-links{grid-column:2;padding:0;flex-direction:row}.purpose{grid-template-columns:2rem 1fr}.purpose-body{grid-column:2}.boundary-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:1.5rem}}
@media(max-width:760px){:root{--shell:calc(100% - 36px)}.site-header,.site-header.is-scrolled{padding:10px 18px;gap:.6rem}.site-nav{background:var(--paper);top:68px;padding:10px 18px 20px}.site-nav a{font-size:.9rem}.header-controls{margin-left:auto}.hero{grid-template-columns:1fr;gap:1.5rem;padding-block:1.75rem 2rem}.hero h1,html[lang=vi] .hero h1{font-size:2rem;line-height:1.2}.hero-lede{font-size:1rem}.hero-actions{margin-top:1rem;flex-direction:row;align-items:center}.hero-index{padding:1.1rem}.hero-index dl>div{grid-template-columns:3.6rem 1fr}.purpose{padding-block:2rem;gap:.7rem 1rem}.purpose-body{margin-top:0}.research-panel,.boundary-panel{padding-block:2rem}.research-heading{padding-bottom:1rem}.publication{gap:.6rem 1rem;padding:1.2rem 0}.publication h3{font-size:1.1rem}.publication-summary{grid-template-columns:1fr;gap:.8rem}.publication-sample{font-size:1.5rem}.publication-meta{display:flex}.publication-links{gap:1rem}.outcomes{padding-block:2rem}.outcomes-heading{padding-top:1rem;gap:1rem}.condition-heading{grid-template-columns:1fr;gap:.6rem}.condition-heading>p{margin:0}.condition-block,.condition-aa{margin-top:2rem}.condition-heading h2{font-size:1.4rem}.case{margin-bottom:2rem}.case-header{display:block}.case-interval{margin-top:.4rem;text-align:left}.case-copy{padding-top:.8rem;gap:.6rem}.timepoint figcaption{flex-wrap:wrap;font-size:.75rem;padding:.7rem}.boundary-grid{gap:1.2rem}.next-section{padding-block:2rem}.next-card{grid-template-columns:1fr;gap:1rem;padding:1.1rem}.footer-grid{grid-template-columns:1fr;gap:1.2rem}.footer-bottom{gap:1rem;flex-wrap:wrap}}
@media(max-width:420px){.publication{grid-template-columns:1fr}.publication-order,.publication-links{grid-column:1}.hero .eyebrow{flex-wrap:wrap;row-gap:.3rem}.history-note{grid-template-columns:1fr;gap:.4rem}}

.header-controls{order:3}.site-nav{order:2}

.skip-link{background:var(--ink);color:var(--paper)}

/* Keep the parent-site destination visible beside the existing project navigation. */
.site-identity{min-width:0;display:flex;flex-direction:column;gap:0}.site-identity .wordmark{min-height:30px;display:flex;align-items:center}.project-label{color:var(--ink-soft);font-size:.7rem;line-height:1.25}