/* BURGER project website. */
:root {
  --paper: #ffffff;
  --surface: #f7f8f5;
  --ink: #20241f;
  --secondary: #4b5149;
  --muted: #62685e;
  --line: #dfe2db;
  --accent: #b23a2d;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --width: 1080px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 16px/1.65 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-underline-offset: 4px; text-decoration-color: var(--line); }
a:hover { color: var(--accent); text-decoration-color: var(--accent); }
button, input { font: inherit; }
button { color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
button:focus-visible { outline-offset: 3px; }
img, video { display: block; max-width: 100%; }
figure, p, h1, h2, h3, h4 { margin: 0; }
strong { font-weight: 600; }
sub, sup { font-size: .7em; line-height: 0; }
q { quotes: "“" "”"; }
.container { max-width: calc(var(--width) + 64px); padding: 0 32px; margin: 0 auto; }
.accent { color: var(--accent); }
.skip-link { position: fixed; top: 8px; left: 8px; padding: 8px 16px; background: var(--ink); color: white; transform: translateY(-150%); z-index: 100; }
.skip-link:focus { transform: none; }

.site-nav { position: sticky; top: 0; z-index: 20; background: rgba(255, 255, 255, .97); border-bottom: 1px solid var(--line); }
.nav-inner { max-width: calc(var(--width) + 64px); padding: 0 32px; height: 58px; margin: auto; display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.brand { display: flex; align-items: center; gap: 16px; text-decoration: none; font-size: 13px; font-weight: 600; letter-spacing: .12em; }

.hero { padding-top: 40px; text-align: center; }
.wordmark { display: block; font: 600 clamp(42px, 5vw, 54px)/1.1 var(--sans); letter-spacing: -.035em; }
.paper-title { display: block; margin: 15px auto 0; max-width: 900px; font: 500 clamp(20px, 2.4vw, 26px)/1.4 var(--sans); color: var(--ink); letter-spacing: -.018em; }
.authors { list-style: none; display: grid; grid-template-columns: repeat(4, max-content); justify-content: center; gap: 6px 25px; margin: 24px 0 0; padding: 0; font-size: 14px; color: var(--secondary); }
.authors li { white-space: nowrap; }
.authors a { text-decoration: none; }
.authors sup { color: var(--accent); margin-left: 2px; }
.affiliation { display: flex; flex-wrap: wrap; justify-content: center; gap: 2px 20px; margin-top: 12px; font-size: 14px; }
.affiliation > span { white-space: nowrap; }
.author-notes { margin-top: 4px; font-size: 12px; color: var(--muted); }
.author-notes span { margin-left: 14px; }
.resources { margin-top: 22px; display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 12px 20px; }

.section { padding-top: 56px; padding-bottom: 56px; }
.section + .section:not(.band) { border-top: 1px solid var(--line); }
.band { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-heading { max-width: 800px; margin-bottom: 28px; }

h2, .evidence-block > .section-title { font: 600 clamp(26px, 2.7vw, 32px)/1.3 var(--sans); letter-spacing: -.018em; text-wrap: pretty; }
.section-heading > p { max-width: 760px; margin-top: 16px; color: var(--secondary); font-size: 16px; line-height: 1.75; text-wrap: pretty; }
h3 { font-size: 18px; font-weight: 600; line-height: 1.45; }
.caption, figcaption { margin-top: 12px; color: var(--secondary); font-size: 13px; line-height: 1.65; }
.why-section { padding-top: 40px; }
.section.why-section { border-top: 0; }
.why-lead { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 40px; }

.opening-demo .video-frame { aspect-ratio: 4 / 3; }
.opening-demo .video-frame video { object-fit: contain; background: #e6e7e1; }
.opening-demo .instruction { color: var(--ink); font-size: 13px; }
.opening-demo > figcaption { max-width: 560px; font-size: 13px; }

.intro-copy, .section-lead, .resource-intro, .study-finding { max-width: 760px; font-size: 16px; line-height: 1.8; color: var(--secondary); text-wrap: pretty; }
.intro-copy p + p { margin-top: 16px; }
.intro-copy h2 { margin-bottom: 18px; }
.section-lead { margin: 16px 0 28px; }
.resource-intro { margin-bottom: 24px; }

.study-finding { margin-top: 26px; }
.study-finding strong { color: var(--ink); }

.training-examples { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin: 24px 0 0; }
.training-examples > * { min-width: 0; }
.training-examples .video-frame { aspect-ratio: 4 / 3; }

.hardware-feature { margin-top: 26px; }
.hardware-feature > * { min-width: 0; }
.hardware-feature .video-frame { aspect-ratio: 640 / 400; }

.dataset-facts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; padding: 23px 0; margin: 0 0 30px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.dataset-facts > div { display: flex; flex-direction: column-reverse; gap: 8px; }
.dataset-facts dt { font-size: 13px; color: var(--secondary); }
.dataset-facts dd { margin: 0; font: 500 30px/1 var(--sans); letter-spacing: -.035em; }

.circle-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.video-frame { position: relative; overflow: hidden; background: #e1e2dc; border-radius: 5px; aspect-ratio: 1000 / 760; }
.video-frame video { width: 100%; height: 100%; object-fit: cover; }
.video-tag { position: absolute; top: 8px; left: 8px; padding: 3px 6px; border-radius: 3px; color: white; background: rgba(27, 31, 27, .72); font-size: 10px; line-height: 1.3; pointer-events: none; }
.video-toggle, .stroke-toggle { position: absolute; right: 8px; bottom: 8px; display: grid; place-items: center; width: 32px; height: 32px; padding: 0; border: 1px solid rgba(255,255,255,.7); border-radius: 50%; background: rgba(255,254,250,.94); color: var(--ink); font-size: 12px; }
.video-toggle:hover, .stroke-toggle:hover { background: white; }
.video-toggle:focus-visible, .stroke-toggle:focus-visible { outline-offset: -5px; }
.demo figcaption strong { display: block; color: var(--ink); font-size: 14px; }
.demo figcaption > span { display: block; margin-top: 4px; font-size: 13px; }
.finding-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin: 28px 0 22px; font-size: 15px; line-height: 1.75; color: var(--secondary); }
.finding-pair strong { display: block; margin-bottom: 3px; color: var(--ink); }
.content-block { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--line); }
.content-block > .content-title { margin-bottom: 18px; font: 600 20px/1.4 var(--sans); }
.content-block + .content-block { margin-top: 40px; }
.content-body > p { max-width: 800px; font-size: 16px; line-height: 1.75; color: var(--secondary); }
.content-body p + p { margin-top: 12px; }
.wide-figure { width: 100%; height: auto; }

.table-scroll { overflow-x: auto; max-width: 100%; }
table { width: 100%; border-collapse: collapse; font-size: 13px; font-variant-numeric: tabular-nums; white-space: nowrap; }
caption { padding: 12px 0; text-align: left; color: var(--muted); font-size: 13px; }
th, td { padding: 10px 13px; text-align: right; border-bottom: 1px solid var(--line); }
th:first-child { text-align: left; padding-left: 0; }
thead th { color: var(--secondary); font-size: 12px; font-weight: 500; }
tbody th { font-weight: 500; }

.composition-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.demo-heading { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 5px 15px; margin-bottom: 9px; color: var(--muted); font-size: 12px; }
.status-label { font-weight: 600; color: var(--secondary); }
.status-label.accent { color: var(--accent); }
.composition-demo .video-frame { aspect-ratio: 1120 / 800; }
.composition-demo figcaption { color: var(--ink); font: 500 16px/1.5 var(--sans); }
.paper-figure img { width: 100%; height: auto; }
.reading-width { max-width: 780px; }

.dataset-relations { margin: 40px 0 0; padding-top: 32px; border-top: 1px solid var(--line); scroll-margin-top: 85px; }
.relation-intro { max-width: 800px; margin-bottom: 23px; }
.relation-intro h3 { font: 600 21px/1.4 var(--sans); letter-spacing: -.01em; }
.relation-intro > p { color: var(--secondary); font-size: 16px; max-width: 760px; margin-top: 12px; }

.relation-browser { padding: 24px; border: 1px solid var(--line); border-radius: 5px; background: var(--paper); }
.gallery-control { display: none; }
.gallery-enhanced .gallery-control { display: flex; }
.relation-toolbar { align-items: center; justify-content: space-between; gap: 16px; padding-bottom: 19px; border-bottom: 1px solid var(--line); }
.relation-filters { display: flex; gap: 5px; }
.relation-filters button { display: flex; align-items: baseline; gap: 14px; padding: 9px 15px; border: 1px solid transparent; border-radius: 4px; background: transparent; font-size: 13px; }

.relation-filters button:hover { background: var(--surface); }
.relation-filters button[aria-pressed="true"] { background: var(--accent); color: var(--paper); }
.relation-kind { font-size: 10px; color: var(--secondary); letter-spacing: .04em; text-transform: uppercase; white-space: nowrap; }
.relation-context { align-items: center; justify-content: space-between; gap: 24px; min-height: 85px; padding: 16px 0 20px; }
.relation-context > p { max-width: 610px; font-size: 13px; line-height: 1.65; color: var(--secondary); }
.relation-variants { display: flex; gap: 3px; align-items: center; flex-shrink: 0; }
.relation-variants > span { margin-right: 9px; font-size: 10px; color: var(--muted); }
.relation-variants button { padding: 5px 8px; min-width: 31px; border: 1px solid var(--line); border-radius: 3px; background: transparent; font-size: 10px; font-variant-numeric: tabular-nums; }
.relation-variants button[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.relation-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 25px 20px; align-items: start; }
.relation-card { min-width: 0; }
.relation-card .video-frame { aspect-ratio: 4 / 3; background: #e7e7e7; }
.relation-card .video-frame video { width: 100%; height: 100%; object-fit: contain; }
.relation-expand { position: absolute; top: 9px; right: 9px; display: grid; place-items: center; width: 30px; height: 30px; border: 1px solid rgba(255,255,255,.65); border-radius: 4px; background: rgba(255,254,250,.85); color: var(--ink); }
.relation-expand:hover { color: var(--accent); background: var(--paper); }
.relation-card figcaption { margin-top: 10px; font: 500 15px/1.5 var(--sans); }
.relation-card figcaption em { color: var(--accent); font-style: normal; }
.relation-card figcaption small { display: block; margin-top: 4px; color: var(--muted); font: 400 12px/1.5 var(--sans); font-variant-numeric: tabular-nums; }
.relation-footer { align-items: center; justify-content: space-between; gap: 12px; padding-top: 18px; margin-top: 22px; border-top: 1px solid var(--line); font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.relation-footer > :first-child { color: var(--secondary); }
.relation-footnote { margin-top: 13px; color: var(--muted); font-size: 13px; }

.relation-fallback-title { margin: 25px 0 15px; }
.gallery-enhanced .relation-fallback-title { display: none; }
.dataset-relations [hidden] { display: none !important; }
.relation-lightbox { width: min(700px, calc(100% - 32px)); max-height: 92vh; padding: 20px; color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 5px; }
.relation-lightbox::backdrop { background: rgba(25, 28, 24, .65); }
.relation-lightbox-heading { display: flex; align-items: center; justify-content: space-between; gap: 15px; margin-bottom: 15px; }
.relation-lightbox-heading > p { font: 600 20px/1.4 var(--sans); }
.relation-lightbox-heading button { width: 36px; height: 36px; flex-shrink: 0; border: 1px solid var(--line); border-radius: 50%; background: transparent; font-size: 23px; line-height: 1; }
.relation-lightbox > video { display: block; max-height: 60vh; width: 100%; aspect-ratio: 4 / 3; margin: auto; object-fit: contain; background: #e7e7e7; }
.relation-lightbox-prompt { margin-top: 14px; color: var(--secondary); font-size: 14px; }
.relation-lightbox-detail { margin-top: 4px; color: var(--muted); font-size: 13px; }
.relation-lightbox > a { display: inline-block; margin-top: 5px; font-size: 13px; color: var(--accent); }

@media (max-width: 850px) {
  .relation-context { flex-wrap: wrap; gap: 12px; }
  .relation-context > p { max-width: none; }
  .relation-browser { padding: 18px; }
  .relation-grid { gap: 22px 14px; }
  .relation-card figcaption { font-size: 14px; }
}
@media (max-width: 600px) {
  .dataset-relations { margin-top: 30px; padding-top: 25px; }
  .relation-browser { padding: 14px; }
  .relation-toolbar { flex-wrap: wrap; gap: 12px; }
  .relation-filters { width: 100%; }
  .relation-filters button { flex: 1; min-width: 0; min-height: 44px; justify-content: center; padding: 8px 6px; gap: 6px; font-size: 11px; }
  .relation-variants button { min-width: 36px; min-height: 36px; }
  .relation-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px 12px; }
  .relation-context { padding: 15px 0 18px; }
  .relation-footer { flex-wrap: wrap; gap: 6px; }
  .relation-card .video-tag { left: 6px; top: 6px; font-size: 9px; }
  .relation-card .video-toggle { right: 6px; bottom: 6px; }
  .relation-expand { top: 6px; right: 6px; }
}

.real-transfer { margin-bottom: 36px; padding: 24px 0 0; border-top: 1px solid var(--line); scroll-margin-top: 80px; }
.transfer-intro { max-width: 800px; }

.transfer-intro h3 { font: 600 21px/1.4 var(--sans); letter-spacing: -.01em; }
.transfer-intro > p { color: var(--secondary); font-size: 15px; max-width: 760px; margin-top: 12px; }
.transfer-facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin: 26px 0; padding: 22px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.transfer-facts dt { font-size: 13px; color: var(--secondary); }
.transfer-facts dd { margin: 5px 0 0; font: 500 28px/1.2 var(--sans); font-variant-numeric: lining-nums; }

.transfer-facts dd span { display: block; margin-top: 5px; font: 400 12px/1.5 var(--sans); color: var(--muted); }

.transfer-card { min-width: 0; }
.transfer-gallery .video-frame { aspect-ratio: 4 / 3; }

@media (max-width: 680px) {
  .real-transfer { padding-top: 20px; }
  .transfer-facts { gap: 12px; }
  .transfer-facts dt { font-size: 12px; overflow-wrap: anywhere; }
  .transfer-facts dd { font-size: 24px; }

  .transfer-card .video-tag { font-size: 9px; top: 6px; left: 6px; }
}

.pipeline { margin-top: 28px; padding: 24px 0; border-top: 1px solid var(--line); }

.object-picker { display: flex; flex-wrap: wrap; gap: 5px; }
.object-picker button { border: 1px solid transparent; border-radius: 4px; background: none; font-size: 12px; padding: 6px 11px; }
.object-picker button:hover { background: var(--surface); }
.object-picker button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }

.sketch-frame { aspect-ratio: 1; background: white; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 4px; }
.sketch-frame img { width: 90%; height: 90%; object-fit: contain; }

.stroke-frame { position: relative; }
.stroke-frame canvas { display: block; width: 90%; height: 90%; }
.stroke-toggle { border-color: var(--line); }

.step-number { font-size: 10px; margin-right: 8px; color: var(--accent); }

.scaling-gallery { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin: 24px 0 16px; }
.scaling-gallery figure { min-width: 0; }
.scaling-gallery figcaption { margin: 0 0 12px; color: var(--ink); font-size: 16px; font-weight: 600; text-align: center; }
.scaling-gallery img { width: 100%; height: auto; }
.real-group + .real-group { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--line); }
.real-group-heading { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 6px 24px; margin-bottom: 16px; }
.real-group-heading h3 { font-size: 16px; }
.real-group-heading p { color: var(--secondary); font-size: 14px; }
.real-gallery { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.real-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.real-group .video-frame { aspect-ratio: 640 / 400; }

.closing { padding-top: 48px; padding-bottom: 48px; }
.closing-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 60px; }
.closing h2 { font-size: clamp(24px, 2.5vw, 28px); }
.overview-video { margin-top: 18px; width: 100%; aspect-ratio: 16 / 9; background: var(--ink); border-radius: 5px; }
.closing-info { padding-top: 4px; min-width: 0; }
.closing-info .content-block:first-child { margin-top: 0; }
.closing-info .content-block > .content-title { font: 600 15px/1.4 var(--sans); }
.copy-button { font-size: 13px; border: 1px solid var(--line); border-radius: 4px; background: var(--paper); padding: 6px 10px; }
.copy-status { font-size: 13px; color: var(--secondary); margin-left: 10px; }
pre { margin: 12px 0 0; padding: 14px; background: var(--paper); border: 1px solid var(--line); white-space: pre-wrap; overflow-wrap: anywhere; font: 12px/1.6 ui-monospace, monospace; }
.footer { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; min-height: 78px; font-size: 12px; color: var(--muted); }

@media (min-width: 1450px) {
  .section { padding-top: 64px; padding-bottom: 64px; }
  .why-section { padding-top: 44px; padding-bottom: 58px; }
}
@media (max-width: 900px) {
  .container, .nav-inner { padding-left: 24px; padding-right: 24px; }
  .circle-grid { gap: 8px; }
  .why-lead { grid-template-columns: 1fr 1.1fr; gap: 28px; }

  .closing-grid { gap: 32px; }
}
@media (max-width: 680px) {
  .nav-inner { height: auto; min-height: 58px; padding-top: 10px; padding-bottom: 10px; flex-wrap: wrap; gap: 8px; }

  .hero { padding-top: 26px; }
  .authors { grid-template-columns: repeat(2, max-content); gap: 6px 23px; font-size: 13px; }
  .desktop-break { display: none; }

  .section { padding-top: 44px; padding-bottom: 44px; }
  .why-section { padding-top: 36px; }
  .why-lead { grid-template-columns: 1fr; gap: 24px; }

  .training-examples { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px 12px; }
  .hardware-feature > .real-pair { grid-template-columns: 1fr; gap: 28px; }

  .dataset-facts { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 25px; }
  .dataset-facts dd { font-size: 28px; }

  .section-heading { margin-bottom: 24px; }
  .circle-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px 10px; }
  .circle-grid > :nth-child(4), .circle-grid > :nth-child(5) { grid-column: auto; }
  .finding-pair { gap: 20px; font-size: 15px; }
  .composition-grid { gap: 15px; }
  .composition-demo figcaption { font-size: 16px; }

  .pipeline { padding: 20px 0; }

  .closing-grid { grid-template-columns: 1fr; gap: 25px; }
  .scaling-gallery { grid-template-columns: 1fr; gap: 28px; }
  .real-gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .real-pair { gap: 16px; }
  .closing-info { margin-top: 0; }
}
@media (max-width: 420px) {
  html { scroll-padding-top: 110px; }
  .container, .nav-inner { padding-left: 18px; padding-right: 18px; }

  .brand { font-size: 11px; }

  .resources { gap: 10px; }
  .circle-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .circle-grid > :last-child { grid-column: 1 / -1; max-width: calc(50% - 5px); width: 100%; justify-self: center; }
  .finding-pair, .composition-grid { grid-template-columns: 1fr; gap: 20px; }
  .object-picker { gap: 1px; }
  .object-picker button { min-height: 36px; padding: 6px 9px; font-size: 12px; }

  .real-pair { grid-template-columns: 1fr; gap: 24px; }

}

.site { --rail-gutter: 180px; }
.site main, .site > .footer { margin-left: var(--rail-gutter); }
.site > .footer { max-width: none; padding-left: max(32px, calc((100vw - var(--rail-gutter) - var(--width)) / 2)); padding-right: max(32px, calc((100vw - var(--rail-gutter) - var(--width)) / 2)); }
.site .nav-inner { max-width: none; min-height: 64px; height: auto; padding: 12px 28px; gap: 28px; }
.site .brand { flex: 1 1 auto; min-width: 0; gap: 14px; }
.brand-name { flex: 0 0 auto; color: var(--accent); }
.brand-title { max-width: 780px; padding-left: 14px; border-left: 1px solid var(--line); font-size: 12px; line-height: 1.4; font-weight: 400; letter-spacing: 0; color: var(--secondary); }

.site .wordmark { color: var(--accent); }
.resource-links { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 10px; margin-top: 24px; }
.resource-link { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 42px; padding: 9px 15px; border: 1px solid var(--line); border-radius: 5px; background: var(--paper); color: var(--ink); font-size: 14px; font-weight: 500; text-decoration: none; }
.resource-link svg { flex: 0 0 auto; width: 18px; height: 18px; }
.resource-link .hugging-face { font-size: 19px; line-height: 1; }
.resource-link:not(:disabled):not([aria-disabled="true"]):hover { border-color: var(--accent); color: var(--accent); }
.resource-link:disabled, .resource-link[aria-disabled="true"] { color: var(--muted); background: var(--surface); cursor: default; }
.resource-status { margin-top: 10px; color: var(--muted); font-size: 12px; line-height: 1.5; text-align: center; }
.section-nav { position: fixed; z-index: 15; top: calc(50% + 32px); left: 20px; width: 160px; max-height: calc(100vh - 112px); overflow-y: auto; scrollbar-width: none; transform: translateY(-50%); }
.section-nav a { --proximity: 0; position: relative; display: flex; align-items: center; gap: 10px; width: 100%; height: 28px; padding: 0; color: var(--muted); text-decoration: none; }
.section-nav .nav-tick { flex: 0 0 auto; display: block; width: calc(12px + 25px * var(--proximity)); height: calc(1px + 1px * var(--proximity)); background: currentColor; transition: width 160ms ease-out, height 160ms ease-out, color 160ms ease-out; }
.section-nav .nav-label { display: block; max-width: 112px; font-size: 10px; line-height: 1.35; opacity: 0; transform: translateX(-4px); transition: opacity 160ms ease-out, transform 160ms ease-out; }
.section-nav a[aria-current="location"], .section-nav a:hover, .section-nav a:focus-visible { color: var(--accent); }
.section-nav a[aria-current="location"] .nav-tick, .section-nav a:hover .nav-tick, .section-nav a:focus-visible .nav-tick { width: 37px; height: 2px; }
.section-nav a[aria-current="location"] .nav-label, .section-nav a:hover .nav-label, .section-nav a:focus-visible .nav-label { opacity: 1; transform: none; }
.section-nav a:focus-visible { outline-offset: 3px; }

.site .why-lead { grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); gap: 36px; }
.site .why-lead > * { min-width: 0; }
.video-compare { --split: 50%; isolation: isolate; touch-action: pan-y pinch-zoom; cursor: ew-resize; -webkit-user-select: none; user-select: none; background: #eef0ea; }
.video-compare .compare-layer { position: absolute; inset: 0; display: block; width: 100%; height: 100%; object-fit: contain; pointer-events: none; background: #eef0ea; }
.video-compare .compare-layer video { width: 100%; height: 100%; object-fit: contain; }
.video-compare .compare-real { z-index: 0; }
.video-compare .compare-sim { z-index: 1; clip-path: inset(0 calc(100% - var(--split, 50%)) 0 0); }
.compare-label { position: absolute; top: 10px; z-index: 2; padding: 4px 8px; border-radius: 3px; background: rgba(32, 36, 31, .78); color: white; font-size: 11px; line-height: 1.4; pointer-events: none; }
.sim-label { left: 10px; }
.real-label { right: 10px; }
.compare-divider { position: absolute; z-index: 2; top: 0; bottom: 0; left: var(--split, 50%); width: 2px; margin-left: -1px; background: white; box-shadow: 0 0 0 1px rgba(32, 36, 31, .18); pointer-events: none; }
.compare-divider::after { content: "↔"; position: absolute; top: 50%; left: 50%; display: grid; place-items: center; width: 38px; height: 38px; transform: translate(-50%, -50%); border: 1px solid rgba(32, 36, 31, .18); border-radius: 50%; background: #fff; color: var(--ink); box-shadow: 0 2px 8px rgba(32, 36, 31, .12); font-size: 22px; line-height: 1; }
.compare-range { appearance: none; -webkit-appearance: none; position: absolute; z-index: 3; inset: 0; width: 100%; height: 100%; margin: 0; border: 0; border-radius: 0; background: transparent; pointer-events: none; }
.compare-range::-webkit-slider-runnable-track { height: 100%; border: 0; background: transparent; }
.compare-range::-webkit-slider-thumb { appearance: none; -webkit-appearance: none; width: 1px; height: 100%; border: 0; background: transparent; }
.compare-range::-moz-range-track { height: 100%; border: 0; background: transparent; }
.compare-range::-moz-range-thumb { width: 1px; height: 38px; border: 0; background: transparent; }
.compare-range:focus-visible { outline: none; }
.video-compare:has(.compare-range:focus-visible) { outline: 2px solid var(--accent); outline-offset: 4px; }
.compare-play { position: absolute; z-index: 5; right: 10px; bottom: 10px; display: grid; place-items: center; width: 36px; height: 36px; padding: 0; border: 1px solid rgba(32, 36, 31, .2); border-radius: 50%; background: rgba(255, 255, 255, .96); color: var(--ink); font-size: 13px; }
.compare-play:hover { background: white; border-color: var(--accent); }
.compare-play:focus-visible { outline-offset: 3px; }
.compare-hint { margin-top: 10px; color: var(--secondary); font-size: 13px; line-height: 1.6; }

.trajectory-comparison { width: 760px; max-width: 100%; margin-top: 28px; }
.trajectory-video { width: 100%; aspect-ratio: 16 / 9; background: white; }
.trajectory-video video { width: 100%; height: 100%; object-fit: contain; }

.gallery-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.gallery-heading > :first-child { min-width: 0; }
.gallery-heading .content-title { margin: 0; font-size: 20px; line-height: 1.4; }
.gallery-heading .caption { margin-top: 6px; }
.gallery-heading > .gallery-controls { flex: 0 0 auto; margin: 0; }
.single-gallery { display: grid; grid-auto-flow: column; grid-auto-columns: calc((100% - 48px) / 4); gap: 16px; overflow-x: auto; overscroll-behavior-inline: contain; scroll-snap-type: x mandatory; scrollbar-width: thin; scrollbar-color: var(--line) transparent; padding-bottom: 14px; }
.single-card { min-width: 0; scroll-snap-align: start; }
.single-card .video-frame { aspect-ratio: 4 / 3; }
.single-card .video-frame video { object-fit: contain; }
.single-card figcaption { margin-top: 9px; font-size: 13px; }

.gallery-placeholder { display: grid; align-content: center; min-height: 200px; padding: 24px; border: 1px dashed var(--line); background: var(--surface); color: var(--secondary); font-size: 14px; line-height: 1.65; text-align: center; }

.gallery-controls { display: flex; align-items: center; justify-content: flex-end; gap: 8px; margin: 0 0 14px; }
.gallery-controls button { display: grid; place-items: center; width: 36px; height: 36px; padding: 0; border: 1px solid var(--line); border-radius: 50%; background: var(--paper); font-size: 17px; }
.gallery-controls button:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.gallery-controls button:disabled { color: #a6aca1; cursor: default; }

.site #diversity > .content-title { font: 600 clamp(26px, 2.7vw, 32px)/1.3 var(--sans); letter-spacing: -.018em; }

.evidence-block { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--line); }
.evidence-block > h3 { margin-bottom: 20px; font-size: 18px; line-height: 1.45; }
.evidence-block > .details-body { max-width: none; padding-top: 0; }
.evidence-block > .details-body > p { max-width: 800px; }

.evidence-block > .details-body > .real-transfer, .evidence-block > .details-body > .dataset-relations { margin-top: 0; padding-top: 0; border-top: 0; }
.evidence-block > .details-body > .real-transfer { margin-bottom: 0; }
.site .closing-grid { display: block; }
.site .closing-grid > * + * { margin-top: 36px; }
.site .closing-info { padding-top: 0; }
.site .closing-info .content-block > .content-title { font: 600 22px/1.4 var(--sans); }
.site .closing .content-body > p { max-width: 900px; }
.site .overview-video { width: 100%; max-width: none; }

@media (max-width: 1100px) {
  .site { --rail-gutter: 0px; }
  .section-nav { display: none; }
  .single-gallery { grid-auto-columns: calc((100% - 32px) / 3); }
}
@media (max-width: 800px) {
  .site .nav-inner { padding-left: 24px; padding-right: 24px; gap: 20px; }
  .brand-title { font-size: 11px; }
  .site .why-lead { grid-template-columns: 1fr; gap: 28px; }
  .site .intro-copy { max-width: 760px; }
  .site .opening-demo { width: 100%; max-width: 660px; }
  .single-gallery { grid-auto-columns: calc((100% - 24px) / 2.4); gap: 12px; }
}
@media (max-width: 600px) {
  .site .nav-inner { align-items: stretch; flex-direction: column; gap: 9px; padding: 12px 18px; }
  .site .brand { align-items: flex-start; gap: 10px; }
  .brand-name { padding-top: 1px; font-size: 12px; }
  .brand-title { padding-left: 10px; font-size: 10px; line-height: 1.4; }

  .resource-links { gap: 8px; }
  .resource-link { min-height: 40px; padding: 8px 12px; font-size: 13px; }
  .single-gallery { grid-auto-columns: 74%; gap: 12px; }
  .gallery-placeholder { min-height: 190px; padding: 20px; }
  .site > .footer { padding-left: 24px; padding-right: 24px; }
}
@media (max-width: 420px) {
  .site > .footer { padding-left: 18px; padding-right: 18px; }
  .compare-label { top: 8px; padding: 3px 6px; font-size: 10px; }
  .sim-label { left: 8px; }
  .real-label { right: 8px; }
  .compare-divider::after { width: 34px; height: 34px; font-size: 20px; }
}

.site .resource-links { position: relative; gap: 10px; }
.site .resource-link { position: relative; isolation: isolate; min-height: 42px; padding: 10px 17px; gap: 8px; border: 0; border-radius: 999px; background: linear-gradient(180deg, rgba(255, 255, 255, .82), rgba(255, 255, 255, .58)); -webkit-backdrop-filter: blur(14px) saturate(165%); backdrop-filter: blur(14px) saturate(165%); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .95), inset 0 0 0 1px rgba(32, 36, 31, .065), 0 1px 2px rgba(32, 36, 31, .05), 0 6px 20px rgba(32, 36, 31, .07); color: var(--ink); font-size: 14px; font-weight: 500; line-height: 1.3; letter-spacing: .01em; white-space: nowrap; transition: background 160ms ease, transform 160ms ease; }
.site .resource-link::before { content: ""; position: absolute; inset: 0; padding: 1px; border-radius: inherit; background: linear-gradient(135deg, rgba(255, 255, 255, 1), rgba(255, 255, 255, .5) 22%, rgba(255, 255, 255, 0) 50%, rgba(32, 36, 31, .04) 78%, rgba(32, 36, 31, .07)); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude; pointer-events: none; }
.site .resource-link:not(:disabled):not([aria-disabled="true"]):hover { background: linear-gradient(180deg, rgba(255, 255, 255, .98), rgba(255, 255, 255, .78)); color: var(--ink); }
.site .resource-link:not(:disabled):not([aria-disabled="true"]):active { transform: scale(.98); }
.site .resource-link:disabled, .site .resource-link[aria-disabled="true"] { color: var(--secondary); cursor: default; }
.site .resource-link[data-copy] { min-width: 112px; }
.site .resource-link .ic.doc { fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.site .resource-link .ic.arxiv { fill: #b31b1b; stroke: none; }

.resource-copy-status { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
/* Match the canvas edges and drawing centers with uniform crops.
   Keep the same framing at every screen size without stretching either video. */
.site .video-compare .compare-sim video { object-fit: cover; transform-origin: center; transform: translate(-3.5%, -10.416667%) scale(1.4); }
.site .video-compare .compare-real video { object-fit: cover; transform-origin: center; transform: translate(-5.6%, -1.5%) scale(1.12); }
.site .keyphrase { color: var(--accent); }

.site .finding-pair { grid-template-columns: 1fr; gap: 18px; max-width: 760px; }

.site .pipeline { margin-top: 24px; padding: 0; border-top: 0; }
.generation-prompt { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px 24px; padding: 0 0 20px; margin-bottom: 24px; border-bottom: 1px solid var(--line); }
.generation-prompt q { color: var(--ink); font-size: 18px; font-weight: 500; line-height: 1.5; }
.generation-prompt .object-picker { gap: 5px; }
.generation-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; align-items: start; }
.generation-steps > * { min-width: 0; }
.generation-steps .sketch-frame, .generation-steps .video-frame { position: relative; aspect-ratio: 4 / 3; }
.generation-steps .sketch-frame img, .generation-steps .stroke-frame canvas { position: absolute; top: 50%; left: 50%; width: auto; height: 90%; max-width: 90%; aspect-ratio: 1; object-fit: contain; transform: translate(-50%, -50%); }
.generation-steps [hidden], #extracted-strokes[hidden] { display: none; }
.generation-steps .video-frame video { object-fit: contain; }
.generation-steps figcaption { margin-top: 12px; color: var(--ink); font-size: 14px; font-weight: 500; }
.generation-steps figcaption .step-number { display: inline; margin-top: 0; font-size: 10px; }
.generation-steps > figure > p { margin-top: 7px; color: var(--secondary); font-size: 13px; line-height: 1.65; }
.backend-section { margin-top: 32px; }
.backend-section > h4 { font-size: 20px; font-weight: 600; line-height: 1.4; }
.backend-gallery { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; margin-top: 24px; }
.backend-gallery > * { min-width: 0; }
.backend-gallery img { width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: contain; background: var(--surface); border-radius: 4px; }
.backend-gallery figcaption { margin-top: 10px; color: var(--ink); font-size: 14px; }
.generation-summary { max-width: 900px; margin-top: 24px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--secondary); font-size: 14px; line-height: 1.75; }
.generation-summary p + p { margin-top: 6px; }
.generation-summary strong { color: var(--ink); font-weight: 500; }
.site .transfer-facts { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 760px; }
.site .transfer-gallery { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }

@media (max-width: 800px) {
  .generation-steps, .backend-gallery { gap: 16px; }
}
@media (max-width: 680px) {
  .site .transfer-gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 14px; }
  .generation-prompt { align-items: flex-start; gap: 14px; }
  .generation-steps { grid-template-columns: 1fr; gap: 28px; }
  .generation-steps .sketch-frame, .generation-steps .video-frame { width: 100%; max-width: 520px; }
  .generation-steps > figure > p { max-width: 520px; }
  .backend-gallery { grid-template-columns: 1fr; gap: 24px; }
  .backend-gallery figure { width: 100%; max-width: 520px; }
}
@media (max-width: 420px) {
  .site .resource-links { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 9px; width: 100%; max-width: 354px; margin-left: auto; margin-right: auto; }
  .site .resource-link { min-width: 0; min-height: 40px; padding: 9px 10px; gap: 6px; font-size: 13px; }
  .site .resource-link svg { width: 16px; height: 16px; }
  .site .resource-link[data-copy] { min-width: 0; }
}

.site .reading-width { width: min(100%, 760px); max-width: 100%; }

@media (prefers-reduced-motion: no-preference) {
  .scroll-focus-enabled .scroll-focus-card {
    opacity: .18;
    transition: opacity 450ms cubic-bezier(.2, .65, .3, 1);
  }
  .scroll-focus-enabled .scroll-focus-card.is-scroll-focused, .scroll-focus-enabled .scroll-focus-card:has(:focus-visible), .scroll-focus-enabled .scroll-focus-card:fullscreen, .scroll-focus-enabled .scroll-focus-card:has(:fullscreen) {
    opacity: 1;
  }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .section-nav .nav-tick, .section-nav .nav-label { transition: none; }
  .single-gallery { scroll-behavior: auto; }
  .site .resource-link { transition: none; }
}
@media print {
  .scroll-focus-enabled .scroll-focus-card { opacity: 1; transition: none; }
  .site-nav, .section-nav, .video-toggle, .stroke-toggle, .skip-link, .copy-button { display: none; }
  .site main, .site > .footer { margin-left: 0; }
  body, .band { background: white; }
  .section { padding-top: 30px; padding-bottom: 30px; break-inside: avoid; }
  .hero { padding-top: 10px; }
}