:root {
  --ink: #17191c;
  --muted: #5c636c;
  --line: #d7dce1;
  --paper: #ffffff;
  --soft: #f4f6f7;
  --coral: #d74c3f;
  --coral-dark: #a93029;
  --cyan: #dff6f5;
  --cyan-ink: #146d70;
  --green: #e5f3df;
  --green-ink: #2f6a29;
  --yellow: #f5e9a9;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "DM Sans", Arial, sans-serif;
  letter-spacing: 0;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 58px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 max(22px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid rgba(23, 25, 28, 0.12);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
}
.wordmark {
  width: max-content;
  font: 700 22px/1 "Source Serif 4", Georgia, serif;
  text-decoration: none;
}
nav { display: flex; gap: 28px; }
nav a { color: var(--muted); font-size: 13px; font-weight: 600; text-decoration: none; }
nav a:hover { color: var(--ink); }
.icon-link { justify-self: end; display: grid; place-items: center; width: 36px; height: 36px; }
.icon-link svg { width: 20px; }

.hero {
  position: relative;
  min-height: calc(100vh - 58px);
  padding: 9vh max(24px, calc((100vw - var(--max)) / 2)) 0;
  display: grid;
  grid-template-columns: 0.82fr 1.18fr;
  align-items: center;
  gap: 56px;
  overflow: hidden;
}
.hero-copy { align-self: center; padding-bottom: 84px; }
.eyebrow {
  margin: 0 0 10px;
  color: var(--coral-dark);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}
h1, h2 { font-family: "Source Serif 4", Georgia, serif; letter-spacing: 0; }
h3 { margin: 0; font: 700 30px/1.12 "Source Serif 4", Georgia, serif; letter-spacing: 0; }
h1 { margin: 0; font-size: clamp(68px, 9vw, 124px); line-height: 0.9; }
.offer { max-width: 560px; margin: 20px 0 0; font: 600 25px/1.18 "Source Serif 4", Georgia, serif; }
.authors { max-width: 640px; margin: 18px 0 0; font-size: 13px; font-weight: 700; line-height: 1.65; }
.authors sup, .affiliations sup, .corresponding sup { font-size: 0.72em; line-height: 0; vertical-align: super; }
.affiliations { max-width: 640px; margin: 8px 0 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2px 18px; color: var(--muted); font-size: 9.5px; line-height: 1.45; }
.corresponding { margin: 5px 0 0; color: var(--muted); font-size: 9.5px; }
.lead { max-width: 530px; margin: 20px 0 0; color: var(--muted); font-size: 17px; line-height: 1.55; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 28px; }
.button {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 15px;
  border: 1px solid var(--ink);
  border-radius: 5px;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}
.button svg { width: 17px; }
.button.primary { color: white; background: var(--ink); }
.button.secondary { background: white; }
.overview-figure { margin: 0 0 84px; }
.overview-figure img { width: 100%; border: 1px solid var(--line); }
.metric-band {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  min-height: 84px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 0 max(24px, calc((100vw - var(--max)) / 2));
  background: var(--ink);
  color: white;
}
.metric-band div { display: flex; justify-content: center; flex-direction: column; border-right: 1px solid #3a3e43; padding-left: 22px; }
.metric-band div:first-child { border-left: 1px solid #3a3e43; }
.metric-band strong { font-size: 23px; }
.metric-band span { color: #bdc3c9; font-size: 11px; }

.section { padding: 96px max(24px, calc((100vw - var(--max)) / 2)); }
.section-heading { max-width: 760px; margin-bottom: 38px; }
.section-heading.compact { margin-bottom: 26px; }
h2 { margin: 0; font-size: 42px; line-height: 1.08; }
.section-heading > p:last-child { margin: 16px 0 0; color: var(--muted); line-height: 1.6; }

.visual-section { background: var(--soft); }
.host-tabs { display: flex; gap: 7px; overflow-x: auto; padding: 0 0 12px; scrollbar-width: thin; }
.gallery-tabs { display: flex; gap: 7px; overflow-x: auto; padding-bottom: 12px; }
.host-tab, .gallery-tabs button {
  min-height: 36px;
  flex: 0 0 auto;
  padding: 0 13px;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--muted);
  background: white;
  font: 600 12px/1 "DM Sans", Arial, sans-serif;
  cursor: pointer;
}
.host-tab.active, .gallery-tabs button.active { border-color: var(--ink); color: white; background: var(--ink); }
.media-scroll {
  height: min(70vh, 720px);
  min-height: 540px;
  overflow: auto;
  overscroll-behavior: contain;
  border: 1px solid #bec5cb;
  background: #e6e9eb;
  scrollbar-color: #6b737b #d4d8db;
}
.media-scroll + .paired-metrics { margin-top: 18px; }
.media-scroll:focus-visible { outline: 3px solid var(--coral); outline-offset: 3px; }
.scroll-gallery { display: grid; gap: 20px; padding: 18px; }
.trajectory-gallery { width: max(100%, 1500px); }
.four-policy-gallery { width: max(100%, 1420px); }
.scroll-gallery figure { margin: 0; padding: 14px; background: white; }
.scroll-gallery img {
  width: auto;
  max-width: 100%;
  height: auto;
  object-fit: contain;
  object-position: left top;
}
.image-metadata-crop { overflow: hidden; }
.image-metadata-crop img { display: block; margin-top: -5.5%; }
.scroll-gallery figcaption { max-width: 980px; padding: 12px 2px 2px; color: #3f454b; font-size: 13px; line-height: 1.5; }
.scroll-gallery figcaption strong { color: var(--ink); }
.paired-metrics { display: grid; grid-template-columns: 1fr 1fr 1.2fr; gap: 12px; margin-top: 18px; }
.metric-comparison { display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: stretch; border: 1px solid var(--line); background: white; }
.metric-comparison > span { align-self: center; padding: 12px; font-size: 12px; font-weight: 700; }
.metric-comparison > div { padding: 10px; border-left: 1px solid var(--line); }
.metric-comparison small, .metric-comparison b { display: block; }
.metric-comparison small { color: var(--muted); font-size: 9px; }
.metric-comparison b { margin-top: 2px; font-size: 16px; }
.metric-comparison .winner { background: var(--cyan); color: var(--cyan-ink); }
.paired-metrics > p { align-self: center; margin: 0; color: var(--muted); font-size: 12px; line-height: 1.45; }
.gallery-heading { max-width: 780px; margin: 68px 0 24px; }
.gallery-heading > p:last-child { margin: 12px 0 0; color: var(--muted); font-size: 14px; line-height: 1.55; }
.gallery-workspace {
  height: min(74vh, 820px);
  min-height: 520px;
  overflow: auto;
  border: 1px solid #bec5cb;
  background: #e6e9eb;
  scrollbar-color: #6b737b #d4d8db;
}
.gallery-workspace:focus-visible { outline: 3px solid var(--coral); outline-offset: 3px; }
.gallery-workspace figure { width: max(100%, 1320px); min-height: 100%; margin: 0; padding: 18px; }
.gallery-workspace img { width: 100%; background: white; }
.vqa-section { border-top: 1px solid var(--line); }
.llada-gallery-workspace figure { width: max(100%, 1120px); }
.vqa-summary { display: flex; align-items: baseline; gap: 18px; margin-top: 16px; padding: 16px 0; border-top: 1px solid var(--ink); }
.vqa-summary strong { color: var(--green-ink); font-size: 20px; }
.vqa-summary span { color: var(--muted); font-size: 12px; }

.results-section { border-top: 1px solid var(--line); }
.host-tabs { margin-bottom: 8px; }
.host-panel { border-top: 1px solid var(--ink); }
.result-table { width: 100%; }
.result-note { max-width: 900px; margin: 24px 0 0; color: var(--muted); font-size: 13px; line-height: 1.6; }
.result-row { min-height: 58px; display: grid; grid-template-columns: 1.15fr 1.4fr 0.72fr 0.72fr; align-items: center; border-bottom: 1px solid var(--line); }
.result-row > * { padding: 12px; }
.result-row.header { min-height: 42px; color: var(--muted); font-size: 11px; font-weight: 700; text-transform: uppercase; }
.result-row span, .result-row mark { font-size: 14px; }
.result-row mark { width: max-content; padding: 5px 8px; color: var(--green-ink); background: var(--green); font-weight: 700; }

.diagnostics-section { background: #fafafa; border-top: 1px solid var(--line); }
.diagnostic-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.diagnostic-grid figure { margin: 0; border-top: 1px solid var(--ink); padding-top: 12px; }
.diagnostic-grid figure.wide { grid-column: 1 / -1; }
.diagnostic-grid img { width: 100%; max-height: 560px; object-fit: contain; object-position: left center; background: white; }
.diagnostic-grid figcaption { max-width: 800px; padding-top: 10px; color: var(--muted); font-size: 13px; line-height: 1.5; }
.diagnostic-grid figcaption strong { color: var(--ink); }

.resources-section { display: grid; grid-template-columns: 0.7fr 1.3fr; align-items: end; gap: 60px; background: var(--yellow); }
.resource-links { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); }
.resource-links a { min-height: 104px; display: flex; align-items: center; gap: 12px; padding: 18px; border-bottom: 1px solid var(--ink); text-decoration: none; }
.resource-links a + a { border-left: 1px solid var(--ink); }
.resource-links svg { width: 21px; }
.resource-links strong, .resource-links small { display: block; }
.resource-links small { margin-top: 4px; color: #6e672e; font-size: 10px; }

footer { min-height: 70px; display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 0 max(24px, calc((100vw - var(--max)) / 2)); color: #c8cbd0; background: var(--ink); font-size: 11px; }
footer span:first-child { color: white; font: 700 18px/1 "Source Serif 4", Georgia, serif; }

[hidden] { display: none !important; }

@media (max-width: 820px) {
  .site-header { grid-template-columns: 1fr auto; }
  nav { display: none; }
  .hero { min-height: auto; grid-template-columns: 1fr; padding-top: 68px; gap: 32px; }
  .hero-copy { padding-bottom: 0; }
  .offer { font-size: 21px; }
  .affiliations { grid-template-columns: 1fr; }
  .overview-figure { margin-bottom: 96px; }
  .metric-band { grid-template-columns: repeat(2, 1fr); }
  .metric-band div { min-height: 66px; }
  .metric-band div:nth-child(3) { border-left: 1px solid #3a3e43; }
  .section { padding-top: 68px; padding-bottom: 68px; }
  h2 { font-size: 34px; }
  .gallery-workspace { height: 68vh; min-height: 430px; }
  .gallery-workspace figure { width: 980px; padding: 12px; }
  .llada-gallery-workspace figure { width: 900px; }
  .vqa-summary { align-items: flex-start; flex-direction: column; gap: 5px; }
  .media-scroll { height: 66vh; min-height: 460px; }
  .scroll-gallery { gap: 14px; padding: 12px; }
  .trajectory-gallery, .four-policy-gallery { width: 1120px; }
  .scroll-gallery figure { padding: 10px; }
  .paired-metrics { grid-template-columns: 1fr; }
  .result-row { grid-template-columns: 1fr 1.2fr 0.75fr 0.75fr; }
  .result-row > * { padding: 10px 5px; overflow-wrap: anywhere; }
  .diagnostic-grid { grid-template-columns: 1fr; }
  .diagnostic-grid figure.wide { grid-column: auto; }
  .resources-section { grid-template-columns: 1fr; gap: 28px; }
  .resource-links { grid-template-columns: 1fr; }
  .resource-links a + a { border-left: 0; }
}

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