:root {
  --ink: #18231f;
  --ink-soft: #53605b;
  --paper: #f7f5ef;
  --paper-deep: #eeebe1;
  --white: #fffef9;
  --line: rgba(24, 35, 31, 0.14);
  --blue: #4b7bec;
  --blue-soft: #e6efff;
  --green: #6f9659;
  --green-soft: #e8f0df;
  --coral: #cc664e;
  --coral-soft: #fae9e1;
  --purple: #7969ad;
  --purple-soft: #eee9fa;
  --radius: 20px;
  --shadow: 0 24px 80px rgba(47, 58, 49, 0.1);
  --sans: "DM Sans", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: "DM Serif Display", Georgia, serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

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

.shell {
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
}

.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: 8px 12px;
  background: var(--ink);
  color: white;
  border-radius: 8px;
  transform: translateY(-160%);
}

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

.site-header {
  position: fixed;
  z-index: 100;
  inset: 0 0 auto;
  height: 72px;
  border-bottom: 1px solid transparent;
  transition: background 180ms ease, border-color 180ms ease, backdrop-filter 180ms ease;
}

.site-header.scrolled {
  background: rgba(247, 245, 239, 0.88);
  border-color: var(--line);
  backdrop-filter: blur(16px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.brand-mark {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  font-weight: 600;
}

.nav-links > a {
  color: var(--ink-soft);
  transition: color 150ms ease;
}

.nav-links > a:hover {
  color: var(--ink);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 0;
  background: transparent;
}

.nav-toggle > span:not(.sr-only) {
  display: block;
  width: 22px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
  transition: transform 160ms ease;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 152px 0 84px;
}

.hero::before {
  position: absolute;
  content: "";
  inset: 0 0 auto;
  height: 760px;
  background:
    linear-gradient(rgba(24, 35, 31, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(24, 35, 31, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black, transparent 90%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  text-align: center;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(1px);
  opacity: 0.75;
  pointer-events: none;
}

.orb-one {
  top: 100px;
  right: -80px;
  width: 300px;
  height: 300px;
  background: var(--blue-soft);
}

.orb-two {
  top: 380px;
  left: -120px;
  width: 280px;
  height: 280px;
  background: var(--coral-soft);
}

.eyebrow,
.kicker {
  margin: 0 0 18px;
  color: var(--coral);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 14px;
  color: var(--ink-soft);
  background: rgba(255, 254, 249, 0.72);
  border: 1px solid var(--line);
  border-radius: 999px;
  letter-spacing: 0.08em;
}

.eyebrow-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 4px rgba(204, 102, 78, 0.12);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.paper-name {
  max-width: 1100px;
  margin: 22px auto 8px;
  font-family: var(--serif);
  font-size: clamp(72px, 10vw, 138px);
  font-weight: 400;
  line-height: 0.92;
  letter-spacing: -0.065em;
}

.paper-title {
  max-width: 900px;
  margin: 26px auto 0;
  font-family: var(--serif);
  font-size: clamp(26px, 3.4vw, 43px);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.hero-tagline {
  max-width: 760px;
  margin: 56px auto 0;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: clamp(34px, 4.2vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.04em;
}

.hero-tagline em {
  color: var(--blue);
  font-weight: inherit;
}

.authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 24px;
  max-width: 1040px;
  margin: 34px auto 9px;
  font-size: clamp(15px, 1.55vw, 19px);
  font-weight: 600;
}

.authors sup,
.affiliations sup {
  color: var(--coral);
}

.affiliations {
  margin-bottom: 36px;
  color: var(--ink-soft);
  font-size: clamp(14px, 1.3vw, 17px);
}

.resource-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  max-width: 1000px;
  margin: 0 auto;
}

.resource-button {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  min-height: 76px;
  padding: 13px 15px;
  background: rgba(255, 254, 249, 0.78);
  border: 1px solid var(--line);
  border-radius: 15px;
  text-align: left;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.resource-button:hover {
  transform: translateY(-2px);
  border-color: rgba(24, 35, 31, 0.32);
  box-shadow: 0 12px 30px rgba(47, 58, 49, 0.08);
}

.resource-icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  color: var(--blue);
  background: var(--blue-soft);
  border-radius: 9px;
  font-size: 13px;
  font-weight: 700;
}

.resource-button > span:nth-child(2) {
  display: flex;
  min-width: 0;
  flex-direction: column;
}

.resource-button strong {
  font-size: 14px;
}

.resource-button small {
  overflow: hidden;
  color: var(--ink-soft);
  font-size: 10px;
  font-weight: 500;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.resource-button b {
  color: var(--ink-soft);
  font-size: 13px;
}

.hero-visual {
  position: relative;
  margin-top: 40px;
  padding: 32px 24px 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 26px;
  box-shadow: var(--shadow);
}

.hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: 12px;
}

.figure-scroll {
  overflow-x: auto;
  border-radius: 12px;
}

.figure-label {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 4px 20px;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-align: left;
  text-transform: uppercase;
}

.figure-label span,
figcaption span {
  color: var(--coral);
}

.stat-band {
  background: var(--ink);
  color: var(--paper);
}

.stats {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  padding: 38px 0;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  border-right: 1px solid rgba(255, 255, 255, 0.14);
  text-align: center;
}

.stat:last-child {
  border-right: 0;
}

.stat strong {
  font-family: var(--serif);
  font-size: clamp(34px, 4vw, 52px);
  font-weight: 400;
  line-height: 1;
}

.stat small {
  font-family: var(--sans);
  font-size: 0.48em;
}

.stat span {
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.62);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section {
  padding-block: 120px;
}

.section-heading {
  max-width: 820px;
  margin-bottom: 56px;
}

.section-heading h2 {
  margin-bottom: 20px;
  font-family: var(--serif);
  font-size: clamp(40px, 5.3vw, 68px);
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: -0.04em;
}

.section-heading > p:last-child,
.split-heading > p,
.abstract-copy {
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.7;
}

.split-heading {
  display: grid;
  grid-template-columns: 1.4fr 0.7fr;
  align-items: end;
  gap: 70px;
  max-width: none;
}

.split-heading h2 {
  margin-bottom: 0;
}

.split-heading > p {
  margin-bottom: 5px;
}

.gap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.gap-card {
  min-height: 330px;
  padding: 30px;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.gap-card:nth-child(2) { background: var(--blue-soft); }
.gap-card:nth-child(3) { background: var(--green-soft); }

.card-index {
  display: block;
  margin-bottom: 70px;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 700;
}

.gap-card h3,
.track h3,
.metric-card h3,
.finding h3 {
  margin-bottom: 12px;
  font-size: 25px;
  line-height: 1.22;
  letter-spacing: -0.035em;
}

.gap-card p,
.track p,
.metric-card p,
.finding p {
  color: var(--ink-soft);
}

.mini-line {
  display: flex;
  align-items: end;
  gap: 8px;
  height: 42px;
  margin-top: 26px;
}

.mini-line i {
  flex: 1;
  height: 80%;
  border-radius: 4px 4px 0 0;
  background: var(--coral);
}

.mini-line i:nth-child(2) { height: 70%; }
.mini-line i:nth-child(3) { height: 57%; }
.mini-line i:nth-child(4) { height: 63%; }
.mini-line i:nth-child(5) { height: 42%; }
.mini-line i:nth-child(6) { height: 36%; }

.update-pills {
  display: flex;
  gap: 8px;
  margin-top: 30px;
}

.update-pills i {
  flex: 1;
  padding: 7px 0;
  color: white;
  background: var(--blue);
  border-radius: 8px;
  font-size: 11px;
  font-style: normal;
  font-weight: 700;
  text-align: center;
}

.update-pills i:nth-child(3) { background: var(--purple); }
.update-pills i:nth-child(4) { background: var(--coral); }

.history-path {
  display: flex;
  align-items: center;
  margin-top: 35px;
}

.history-path i {
  flex: 0 0 17px;
  height: 17px;
  border: 4px solid var(--green);
  border-radius: 50%;
}

.history-path b {
  flex: 1;
  height: 2px;
  background: var(--green);
}

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

.tracks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.track {
  padding: 38px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 24px;
}

.track-progressive { border-top: 6px solid var(--green); }
.track-interactive { border-top: 6px solid var(--blue); }

.track-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 36px;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 700;
}

.track-tag {
  padding: 6px 10px;
  color: var(--ink);
  background: var(--green-soft);
  border-radius: 999px;
  text-transform: uppercase;
}

.track-interactive .track-tag {
  background: var(--blue-soft);
}

.timeline {
  margin: 34px 0;
}

.prompt-node {
  display: inline-block;
  margin-bottom: 15px;
  padding: 6px 12px;
  color: var(--green);
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
}

.timeline-line {
  display: flex;
  justify-content: space-between;
  border-top: 2px solid var(--line);
}

.timeline-line i {
  position: relative;
  width: 1px;
}

.timeline-line i::before {
  position: absolute;
  top: -6px;
  left: -5px;
  content: "";
  width: 10px;
  height: 10px;
  background: var(--white);
  border: 2px solid var(--green);
  border-radius: 50%;
}

.track-interactive .timeline-line i::before {
  border-color: var(--blue);
}

.timeline-line b {
  position: absolute;
  top: 11px;
  left: 50%;
  color: var(--ink-soft);
  font-size: 9px;
  font-weight: 600;
  transform: translateX(-50%);
}

.update-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 15px;
}

.update-row i {
  width: 33px;
  padding: 5px 0;
  color: white;
  background: var(--blue);
  border-radius: 7px;
  font-size: 10px;
  font-style: normal;
  font-weight: 700;
  text-align: center;
}

.update-row i:first-child { background: var(--ink); }
.update-row i:nth-child(3) { background: var(--purple); }
.update-row i:nth-child(4) { background: var(--green); }
.update-row i:nth-child(5) { background: var(--coral); }
.update-row i:nth-child(6) { color: var(--ink); background: #edb755; }

.track-list {
  display: grid;
  gap: 10px;
  margin: 50px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.track-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  font-weight: 600;
}

.track-list li::before {
  position: absolute;
  top: 0.65em;
  left: 0;
  content: "";
  width: 7px;
  height: 7px;
  background: var(--green);
  border-radius: 50%;
}

.track-interactive .track-list li::before { background: var(--blue); }

.wide-figure {
  margin: 0;
  padding: 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 24px;
}

.wide-figure img {
  width: 100%;
  border-radius: 10px;
}

figcaption {
  display: flex;
  gap: 12px;
  margin: 18px 4px 0;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 600;
}

.metric-section {
  background: var(--ink);
  color: var(--paper);
}

.metric-section .section-heading > p:last-child,
.metric-section .split-heading > p {
  color: rgba(255, 255, 255, 0.6);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}

.metric-card {
  min-height: 250px;
  padding: 28px;
  color: var(--ink);
  background: var(--white);
  border-radius: var(--radius);
}

.metric-card.progressive { background: var(--green-soft); }
.metric-card.interactive { background: var(--blue-soft); }

.metric-count {
  display: inline-block;
  margin-bottom: 60px;
  padding: 5px 9px;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.wide-figure.compact {
  padding: 22px;
  color: var(--ink);
}

.findings-section {
  background: var(--white);
}

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

.finding {
  display: grid;
  grid-template-columns: 70px 1fr auto;
  align-items: center;
  gap: 22px;
  min-height: 180px;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}

.finding-number {
  color: var(--coral);
  font-family: var(--serif);
  font-size: 34px;
}

.finding h3 {
  margin-bottom: 8px;
  font-size: clamp(22px, 2.1vw, 26px);
}

.finding p {
  max-width: 700px;
  margin-bottom: 0;
}

.finding-label {
  padding: 6px 10px;
  color: var(--ink-soft);
  background: var(--paper);
  border-radius: 999px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.abstract-section {
  background: var(--coral-soft);
}

.abstract-grid,
.citation-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 100px;
}

.abstract-grid .section-heading,
.citation-grid .section-heading {
  margin-bottom: 0;
}

.abstract-copy {
  font-size: 20px;
}

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

.citation-box {
  position: relative;
  min-width: 0;
  padding: 62px 26px 26px;
  color: #e8eee9;
  background: var(--ink);
  border-radius: var(--radius);
}

.citation-box pre {
  margin: 0;
  overflow-x: auto;
  font: 12px/1.65 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  white-space: pre;
}

.copy-button {
  position: absolute;
  top: 16px;
  right: 16px;
  display: inline-flex;
  align-items: center;
  padding: 8px 13px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 999px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.16);
  cursor: pointer;
  font: 700 10px var(--sans);
  letter-spacing: 0.02em;
  appearance: none;
  transition: transform 150ms ease, background 150ms ease;
}

.copy-button:hover {
  background: var(--blue-soft);
  transform: translateY(-1px);
}

footer {
  padding: 42px 0;
  color: var(--paper);
  background: #101815;
}

.footer-inner {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 40px;
}

.footer-inner p {
  margin: 0;
  color: rgba(255, 255, 255, 0.5);
  font-size: 13px;
  text-align: right;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 600ms ease, transform 600ms ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 900px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 64px;
    right: 24px;
    left: 24px;
    display: none;
    align-items: stretch;
    padding: 18px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: var(--shadow);
  }

  .nav-links.open {
    display: grid;
  }

  .nav-links a {
    padding: 8px;
  }

  .resource-links {
    grid-template-columns: 1fr 1fr;
    max-width: 700px;
  }

  .stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px 0;
  }

  .stat:nth-child(3) {
    border-right: 0;
  }

  .split-heading,
  .abstract-grid,
  .citation-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .gap-grid,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .gap-card {
    min-height: 250px;
  }

  .card-index,
  .metric-count {
    margin-bottom: 35px;
  }

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

  .footer-inner {
    grid-template-columns: 1fr;
    justify-items: center;
  }

  .footer-inner p {
    text-align: center;
  }
}

@media (max-width: 620px) {
  .shell {
    width: min(100% - 28px, 1180px);
  }

  .hero {
    padding-top: 124px;
  }

  .paper-name {
    font-size: clamp(57px, 17vw, 78px);
    line-height: 0.95;
  }

  .paper-title {
    font-size: clamp(23px, 7.2vw, 31px);
  }

  .desktop-break {
    display: none;
  }

  .hero-tagline {
    margin-top: 40px;
    font-size: clamp(31px, 9.5vw, 43px);
  }

  .authors {
    gap: 7px 16px;
    margin-top: 34px;
    font-size: 16px;
  }

  .affiliations {
    font-size: 14px;
  }

  .resource-links {
    grid-template-columns: 1fr;
  }

  .resource-button {
    min-height: 68px;
  }

  .hero-visual {
    margin-top: 28px;
    padding: 20px 10px 10px;
    border-radius: 18px;
  }

  .figure-label {
    margin-left: 8px;
  }

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

  .stat {
    border-right: 0;
  }

  .stat:last-child {
    grid-column: 1 / -1;
  }

  .section {
    padding-block: 84px;
  }

  .section-heading {
    margin-bottom: 40px;
  }

  .section-heading h2 {
    font-size: 42px;
  }

  .track {
    padding: 26px 22px;
  }

  .finding {
    grid-template-columns: 48px 1fr;
    gap: 16px;
  }

  .finding-label {
    display: none;
  }

  .wide-figure {
    padding: 10px;
    border-radius: 16px;
  }

  .citation-box {
    padding: 62px 18px 18px;
  }

  .citation-box pre {
    font-size: 10px;
  }
}

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

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