:root {
  --canvas: #f5f6f8;
  --paper: #ffffff;
  --paper-warm: #fbfaf8;
  --ink: #17202a;
  --ink-soft: #344150;
  --muted: #687483;
  --faint: #8d97a3;
  --line: #dfe4e9;
  --line-strong: #cbd3dc;
  --blue: #496b95;
  --blue-deep: #294b73;
  --blue-pale: #eaf0f7;
  --amber: #b85e0d;
  --amber-pale: #fff4e7;
  --dark: #1c2733;
  --dark-soft: #283645;
  --font-serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --shell: 1160px;
  --reading: 970px;
  --header-height: 70px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-soft: 0 18px 55px rgba(30, 46, 63, 0.08);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.nav-open {
  overflow: hidden;
}

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

a {
  color: inherit;
}

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

button {
  color: inherit;
  font: inherit;
}

::selection {
  color: var(--ink);
  background: #dbe7f4;
}

:focus-visible {
  outline: 3px solid rgba(73, 107, 149, 0.45);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  color: #fff;
  background: var(--blue-deep);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-150%);
  transition: transform 160ms ease;
}

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

.shell {
  width: min(calc(100% - 48px), var(--shell));
  margin-inline: auto;
}

.shell--reading {
  width: min(calc(100% - 48px), var(--reading));
}

.site-header {
  position: fixed;
  z-index: 100;
  top: 0;
  right: 0;
  left: 0;
  height: var(--header-height);
  border-bottom: 1px solid transparent;
  background: rgba(245, 246, 248, 0.86);
  backdrop-filter: blur(18px) saturate(140%);
  transition: border-color 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

.site-header.is-scrolled {
  border-color: rgba(203, 211, 220, 0.75);
  background: rgba(250, 251, 252, 0.94);
  box-shadow: 0 4px 24px rgba(27, 40, 53, 0.05);
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(calc(100% - 48px), 1280px);
  height: 100%;
  margin-inline: auto;
}

.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--blue);
  border-radius: 50%;
}

.brand-mark::after {
  position: absolute;
  right: -3px;
  bottom: -3px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--amber);
  border-radius: 50%;
  background: var(--canvas);
  content: "";
}

.site-nav {
  display: flex;
  gap: 25px;
  align-items: center;
}

.site-nav a {
  position: relative;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 550;
  letter-spacing: 0.015em;
  text-decoration: none;
  transition: color 160ms ease;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: -9px;
  left: 0;
  height: 1px;
  background: var(--blue);
  content: "";
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}

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

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

.site-nav .nav-external {
  color: var(--blue-deep);
}

.nav-divider {
  width: 1px;
  height: 18px;
  background: var(--line-strong);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 21px;
  height: 1.5px;
  margin: 5px auto;
  background: var(--ink);
  transition: transform 180ms ease;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 154px 0 0;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #f9fafb 0%, var(--canvas) 100%);
  text-align: center;
}

.hero-glow {
  position: absolute;
  top: -260px;
  left: 50%;
  width: 780px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(90, 130, 175, 0.12) 0%, rgba(245, 246, 248, 0) 70%);
  pointer-events: none;
  transform: translateX(-50%);
}

.eyebrow {
  position: relative;
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: center;
  margin-bottom: 25px;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.venue-badge {
  display: inline-flex;
  align-items: center;
  min-height: 27px;
  padding: 3px 11px;
  border: 1px solid rgba(184, 94, 13, 0.22);
  border-radius: 99px;
  color: #934907;
  background: var(--amber-pale);
}

.hero h1 {
  position: relative;
  max-width: 960px;
  margin: 0 auto;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: clamp(2.55rem, 5.4vw, 4.35rem);
  font-weight: 600;
  letter-spacing: -0.044em;
  line-height: 1.03;
}

.hero h1 span {
  color: var(--blue-deep);
}

.hero-deck {
  max-width: 720px;
  margin: 30px auto 0;
  color: var(--ink-soft);
  font-family: var(--font-serif);
  font-size: clamp(1.12rem, 2vw, 1.35rem);
  line-height: 1.55;
}

.authors {
  max-width: 850px;
  margin: 34px auto 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.85;
}

.authors a {
  color: var(--blue-deep);
  text-decoration-color: rgba(41, 75, 115, 0.3);
  text-underline-offset: 3px;
}

.authors sup,
.affiliations sup {
  position: relative;
  top: -0.15em;
  color: var(--blue);
  font-size: 0.68em;
}

.affiliations {
  margin: 8px auto 0;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.7;
}

.affiliations span {
  margin: 0 7px;
  color: var(--line-strong);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 31px;
}

.button {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 9px 17px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 1px 2px rgba(31, 44, 58, 0.04);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 160ms ease, color 160ms ease, background-color 160ms ease, transform 160ms ease,
    box-shadow 160ms ease;
}

.button svg,
.copy-button svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.button:hover {
  border-color: #aeb9c6;
  color: var(--blue-deep);
  background: #fff;
  box-shadow: 0 8px 22px rgba(34, 50, 67, 0.09);
  transform: translateY(-1px);
}

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

.button--primary:hover {
  border-color: #203e61;
  color: #fff;
  background: #203e61;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 78px;
  border-top: 1px solid var(--line);
}

.metric {
  position: relative;
  padding: 27px 18px 29px;
  text-align: left;
}

.metric + .metric {
  border-left: 1px solid var(--line);
}

.metric strong {
  display: block;
  color: var(--blue-deep);
  font-family: var(--font-serif);
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1;
}

.metric strong span {
  margin-left: 2px;
  font-family: var(--font-sans);
  font-size: 0.47em;
  font-weight: 600;
  letter-spacing: 0;
}

.metric small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  line-height: 1.35;
  text-transform: uppercase;
}

.section {
  padding: 108px 0;
}

.section--figure {
  background: var(--paper);
}

.section--paper {
  background: var(--paper-warm);
}

.section--tinted {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #edf1f5;
}

.section-heading {
  margin-bottom: 45px;
}

.section-heading--split {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(320px, 0.72fr);
  gap: 70px;
  align-items: end;
}

.section-kicker {
  margin: 0 0 11px;
  color: var(--blue);
  font-size: 0.7rem;
  font-weight: 650;
  letter-spacing: 0.13em;
  line-height: 1.4;
  text-transform: uppercase;
}

.section h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3.15rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

.section-heading--split > p {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.75;
}

.paper-figure {
  width: 100%;
  max-width: 840px;
  margin: 0 auto;
}

.paper-figure--hero {
  max-width: 640px;
}

.paper-figure--results {
  max-width: 800px;
}

.figure-frame {
  overflow: hidden;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.figure-frame img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.figure-link {
  display: block;
  border-radius: 8px;
  cursor: zoom-in;
}

.paper-figure figcaption {
  max-width: 900px;
  margin: 17px auto 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.65;
  text-align: center;
}

.paper-figure figcaption span {
  color: var(--ink-soft);
  font-weight: 650;
}

.paper-figure--hero .figure-frame {
  padding: 8px;
}

.content-grid {
  display: grid;
  grid-template-columns: 200px minmax(0, 760px);
  gap: 100px;
  justify-content: center;
}

.section-label h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
}

.prose {
  color: var(--ink-soft);
}

.prose p {
  margin: 0 0 1.35em;
}

.prose--lead {
  font-family: var(--font-serif);
  font-size: clamp(1.08rem, 1.8vw, 1.24rem);
  line-height: 1.82;
}

.prose strong {
  color: var(--ink);
  font-weight: 600;
}

.contributions {
  margin-top: 48px;
  border-top: 1px solid var(--line);
}

.contributions > div {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 13px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.contributions span {
  padding-top: 3px;
  color: var(--amber);
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 650;
  letter-spacing: 0.08em;
}

.contributions p {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 0.86rem;
  line-height: 1.65;
}

.figure-frame--method {
  padding: 10px;
}

.method-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin: 65px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  list-style: none;
}

.method-flow li {
  display: grid;
  grid-template-columns: 35px 1fr;
  gap: 14px;
  padding: 30px 28px 34px;
}

.method-flow li:first-child {
  padding-left: 0;
}

.method-flow li:last-child {
  padding-right: 0;
}

.method-flow li + li {
  border-left: 1px solid var(--line-strong);
}

.method-index {
  padding-top: 4px;
  color: var(--amber);
  font-size: 0.68rem;
  font-weight: 650;
  letter-spacing: 0.08em;
}

.method-flow h3,
.analysis-columns h3,
.cost-intro h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 1.22rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.method-flow p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.68;
}

.implementation-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 38px;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: var(--line-strong);
}

.implementation-strip div {
  padding: 20px 22px;
  background: rgba(255, 255, 255, 0.68);
}

.implementation-strip span,
.implementation-strip strong {
  display: block;
}

.implementation-strip span {
  color: var(--muted);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.implementation-strip strong {
  margin-top: 4px;
  color: var(--ink-soft);
  font-size: 0.79rem;
  font-weight: 600;
}

.figure-frame--results {
  padding: 12px 12px 8px;
  box-shadow: none;
}

.results-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-top: 58px;
}

.result-group {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fff;
}

.result-group__heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
}

.result-group__heading h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.22rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.result-group__heading span {
  color: var(--faint);
  font-size: 0.65rem;
  font-weight: 550;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.table-scroll {
  overflow-x: auto;
  scrollbar-color: var(--line-strong) transparent;
  scrollbar-width: thin;
}

table {
  width: 100%;
  min-width: 510px;
  border-collapse: collapse;
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
}

th,
td {
  padding: 10px 12px;
  border-bottom: 1px solid #edf0f3;
  text-align: right;
  white-space: nowrap;
}

thead th {
  color: var(--faint);
  background: #fafbfc;
  font-size: 0.61rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

th:first-child,
td:first-child {
  text-align: left;
}

tbody th {
  color: var(--ink-soft);
  font-weight: 550;
}

.meta-row {
  color: var(--blue-deep);
  background: rgba(234, 240, 247, 0.58);
}

.meta-row th,
.meta-row td {
  font-weight: 650;
}

.gain-row th,
.gain-row td {
  padding-top: 7px;
  padding-bottom: 7px;
  color: var(--amber);
  background: #fffaf4;
  font-size: 0.69rem;
  font-weight: 650;
}

.rule-row th,
.rule-row td {
  padding-top: 14px;
  border-top: 2px solid var(--line);
}

tbody tr:last-child th,
tbody tr:last-child td {
  border-bottom: 0;
}

.table-note {
  margin: 18px 0 0;
  color: var(--faint);
  font-size: 0.72rem;
  line-height: 1.6;
  text-align: center;
}

.section--dark {
  color: #f3f5f7;
  background: var(--dark);
}

.section-heading--light h2,
.section-heading--light > p {
  color: #f3f5f7;
}

.section-heading--light > p {
  color: #aeb9c4;
}

.section--dark .section-kicker {
  color: #8fb0d3;
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.13);
}

.evidence-grid article {
  min-height: 330px;
  padding: 35px 32px 30px;
  background: var(--dark-soft);
}

.evidence-value {
  margin: 0 0 40px;
  color: #a9c4e0;
  font-family: var(--font-serif);
  font-size: 2.8rem;
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1;
}

.evidence-value span {
  margin-left: 3px;
  font-family: var(--font-sans);
  font-size: 0.38em;
  letter-spacing: 0;
}

.evidence-grid h3 {
  margin: 0;
  color: #fff;
  font-family: var(--font-serif);
  font-size: 1.22rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.evidence-grid article > p:not(.evidence-value) {
  margin: 13px 0 0;
  color: #bdc6cf;
  font-size: 0.83rem;
  line-height: 1.7;
}

.evidence-grid article > span {
  display: block;
  margin-top: 21px;
  color: #8494a3;
  font-size: 0.66rem;
  line-height: 1.55;
}

.analysis-columns {
  display: grid;
  grid-template-columns: 0.78fr 1.22fr;
  gap: 90px;
  margin-top: 90px;
}

.analysis-columns h3 {
  max-width: 380px;
  color: #fff;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
}

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

.insight-list li {
  position: relative;
  padding: 19px 0 19px 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: #b9c3cc;
  font-size: 0.86rem;
  line-height: 1.72;
}

.insight-list li:last-child {
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.insight-list li::before {
  position: absolute;
  top: 28px;
  left: 2px;
  width: 7px;
  height: 7px;
  border: 1.5px solid #d28845;
  border-radius: 50%;
  content: "";
}

.insight-list strong {
  color: #f7f8f9;
  font-weight: 600;
}

.cost-panel {
  display: grid;
  grid-template-columns: minmax(250px, 0.7fr) minmax(0, 1.3fr);
  gap: 80px;
  margin-top: 100px;
  padding: 45px 48px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: var(--radius-lg);
  background: rgba(10, 19, 28, 0.22);
}

.cost-intro h3 {
  color: #fff;
  font-size: 1.6rem;
}

.cost-intro > p:last-child {
  margin: 13px 0 0;
  color: #aeb9c4;
  font-size: 0.8rem;
  line-height: 1.7;
}

.cost-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  margin: 0;
}

.cost-metrics div {
  padding: 5px 22px 23px;
}

.cost-metrics div:nth-child(even) {
  border-left: 1px solid rgba(255, 255, 255, 0.12);
}

.cost-metrics div:nth-child(n + 3) {
  padding-top: 23px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.cost-metrics dt {
  color: #8494a3;
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.cost-metrics dd {
  margin: 7px 0 0;
  color: #fff;
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.cost-metrics dd span {
  font-family: var(--font-sans);
  font-size: 0.48em;
  font-weight: 500;
}

.cost-note {
  grid-column: 1 / -1;
  margin: -28px 0 0;
  padding-top: 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: #96a3af;
  font-size: 0.72rem;
  line-height: 1.7;
}

.cost-note strong {
  color: #d7dde3;
  font-weight: 600;
}

.citation-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #1d2630;
  box-shadow: 0 18px 50px rgba(28, 40, 51, 0.1);
}

.citation-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  color: #8f9ba7;
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.copy-button {
  display: inline-flex;
  gap: 7px;
  align-items: center;
  min-height: 34px;
  padding: 6px 10px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 6px;
  color: #c4cdd5;
  background: rgba(255, 255, 255, 0.05);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: none;
  cursor: pointer;
  transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.copy-button:hover,
.copy-button.is-copied {
  border-color: rgba(255, 255, 255, 0.28);
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.citation-card pre {
  overflow-x: auto;
  margin: 0;
  padding: 25px 28px 28px;
  color: #d2d9df;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.74rem;
  line-height: 1.68;
  scrollbar-color: #53606d transparent;
  scrollbar-width: thin;
}

.resource-links {
  display: flex;
  gap: 28px;
  margin-top: 23px;
}

.resource-links a {
  color: var(--blue-deep);
  font-size: 0.78rem;
  font-weight: 600;
  text-decoration: none;
}

.resource-links a span {
  display: inline-block;
  margin-left: 3px;
  transition: transform 160ms ease;
}

.resource-links a:hover span {
  transform: translate(2px, -2px);
}

.site-footer {
  padding: 48px 0 55px;
  border-top: 1px solid var(--line);
  background: var(--canvas);
}

.footer-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
}

.footer-inner p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.78rem;
  line-height: 1.55;
}

.footer-inner p span {
  color: var(--muted);
  font-size: 0.7rem;
}

.footer-inner > div {
  display: flex;
  gap: 24px;
}

.footer-inner a {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 550;
  text-decoration: none;
}

.footer-inner a:hover {
  color: var(--blue-deep);
}

@media (max-width: 1050px) {
  .site-nav {
    gap: 18px;
  }

  .section-heading--split {
    gap: 45px;
  }

  .content-grid {
    grid-template-columns: 160px minmax(0, 720px);
    gap: 60px;
  }

  .results-groups {
    grid-template-columns: 1fr;
  }

  .result-group table {
    min-width: 620px;
  }
}

@media (max-width: 900px) {
  :root {
    --header-height: 64px;
  }

  .nav-toggle {
    display: block;
  }

  .nav-toggle[aria-expanded="true"] span:first-child {
    transform: translateY(3.25px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] span:last-child {
    transform: translateY(-3.25px) rotate(-45deg);
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    right: 0;
    left: 0;
    display: none;
    align-items: stretch;
    height: calc(100vh - var(--header-height));
    padding: 26px 24px 40px;
    border-top: 1px solid var(--line);
    background: rgba(250, 251, 252, 0.98);
    flex-direction: column;
    gap: 0;
  }

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

  .site-nav a {
    padding: 14px 2px;
    border-bottom: 1px solid var(--line);
    color: var(--ink-soft);
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
  }

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

  .site-nav .nav-external {
    font-family: var(--font-sans);
    font-size: 0.88rem;
  }

  .nav-divider {
    width: 100%;
    height: 22px;
    background: transparent;
  }

  .hero {
    padding-top: 128px;
  }

  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
  }

  .metric:nth-child(3) {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .metric:nth-child(4) {
    border-top: 1px solid var(--line);
  }

  .section-heading--split {
    grid-template-columns: 1fr;
    gap: 22px;
    align-items: start;
  }

  .section-heading--split > p {
    max-width: 620px;
  }

  .method-flow {
    grid-template-columns: 1fr;
  }

  .method-flow li,
  .method-flow li:first-child,
  .method-flow li:last-child {
    padding: 24px 0;
  }

  .method-flow li + li {
    border-top: 1px solid var(--line-strong);
    border-left: 0;
  }

  .implementation-strip {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .evidence-grid article {
    min-height: 0;
  }

  .evidence-value {
    margin-bottom: 24px;
  }

  .analysis-columns {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .cost-panel {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .cost-note {
    margin-top: 0;
  }
}

@media (max-width: 720px) {
  .shell,
  .shell--reading,
  .nav-shell {
    width: min(calc(100% - 32px), var(--shell));
  }

  .hero {
    padding-top: 112px;
  }

  .hero h1 {
    font-size: clamp(2.25rem, 11vw, 3.2rem);
    line-height: 1.02;
  }

  .hero-deck {
    margin-top: 24px;
    font-size: 1.08rem;
  }

  .authors {
    margin-top: 28px;
    font-size: 0.84rem;
  }

  .affiliations span {
    display: block;
    height: 0;
    overflow: hidden;
  }

  .hero-metrics {
    margin-top: 58px;
  }

  .metric {
    padding: 23px 13px;
  }

  .metric small {
    font-size: 0.62rem;
  }

  .section {
    padding: 78px 0;
  }

  .section-heading {
    margin-bottom: 34px;
  }

  .section h2 {
    font-size: clamp(1.9rem, 10vw, 2.55rem);
  }

  .content-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .section-label {
    padding-bottom: 20px;
    border-bottom: 1px solid var(--line);
  }

  .prose--lead {
    font-size: 1.04rem;
    line-height: 1.78;
  }

  .figure-frame,
  .paper-figure--hero .figure-frame,
  .figure-frame--method,
  .figure-frame--results {
    padding: 8px;
    border-radius: 12px;
  }

  .paper-figure figcaption {
    margin-top: 13px;
    font-size: 0.7rem;
    text-align: left;
  }

  .method-flow {
    margin-top: 48px;
  }

  .implementation-strip {
    grid-template-columns: 1fr;
  }

  .results-groups {
    gap: 16px;
    margin-top: 42px;
  }

  .result-group__heading {
    padding: 15px 16px;
  }

  .result-group__heading span {
    display: none;
  }

  .evidence-grid article {
    padding: 28px 24px;
  }

  .analysis-columns,
  .cost-panel {
    margin-top: 68px;
  }

  .cost-panel {
    padding: 30px 24px;
  }

  .cost-metrics {
    grid-template-columns: 1fr;
  }

  .cost-metrics div,
  .cost-metrics div:nth-child(even),
  .cost-metrics div:nth-child(n + 3) {
    padding: 17px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    border-left: 0;
  }

  .citation-card pre {
    padding: 20px;
    font-size: 0.66rem;
  }

  .resource-links {
    align-items: flex-start;
    flex-direction: column;
    gap: 13px;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 28px;
  }
}

@media (max-width: 430px) {
  .eyebrow {
    align-items: center;
    flex-direction: column;
    gap: 8px;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }

  .button--primary {
    grid-column: 1 / -1;
  }

  .button {
    padding-inline: 12px;
  }

  .metric strong {
    font-size: 1.65rem;
  }
}

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

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

@media print {
  .site-header,
  .hero-actions,
  .copy-button,
  .site-footer {
    display: none;
  }

  body,
  .hero,
  .section,
  .section--dark {
    color: #000;
    background: #fff;
  }

  .hero {
    padding-top: 40px;
  }

  .section {
    padding: 50px 0;
    break-inside: avoid;
  }
}