/* Hallmark · macrostructure: Photographic · theme: studied-DNA (source: https://opendrivelab.com/EgoHumanoid/)
 * genre: modern-minimal · tone: technical research · palette: blue
 * nav: N3 Side rail · footer: Ft2 Inline · audience: ICLR reviewers
 * pre-emit critique: P5 H5 E4 S5 R5 V4 · user-directed reference structure */
@import url("tokens.css");

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: clip; }
body { margin: 0; overflow-x: clip; background: var(--color-paper); color: var(--color-ink); font-family: var(--font-body); line-height: 1.6; -webkit-font-smoothing: antialiased; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { min-width: 0; font-family: var(--font-display); font-style: normal; font-weight: 750; line-height: 1.2; letter-spacing: -.035em; overflow-wrap: anywhere; }
h3 { font-size: 1.1rem; letter-spacing: -.02em; }
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
button, select, summary { cursor: pointer; }
button { color: inherit; }
a, button { -webkit-tap-highlight-color: var(--color-transparent); }
button:disabled { opacity: .5; cursor: not-allowed; }
button:active, .button:active { transform: translateY(1px); }
video, img { display: block; width: 100%; max-width: 100%; }
video { object-fit: contain; }
svg { display: block; width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 4px; }
::selection { background: var(--color-accent-soft); color: var(--color-ink); }
.wrap { width: min(1200px, calc(100% - 40px)); margin-inline: auto; }
.section { padding-block: var(--space-section); scroll-margin-top: 68px; }
.section-tint { background: var(--color-surface); }
.section-heading { text-align: center; margin: 0 auto var(--space-2xl); max-width: 930px; }
.section-label { display: inline-flex; align-items: center; padding: .35rem .95rem; margin-bottom: var(--space-md); border-radius: var(--radius-pill); color: var(--color-accent); background: var(--color-accent-soft); font-size: .75rem; line-height: 1.6; font-weight: 700; letter-spacing: .11em; text-transform: uppercase; }
.section-heading h2 { font-size: var(--text-heading); margin-bottom: var(--space-md); }
.section-heading p { max-width: 65ch; margin: 0 auto; color: var(--color-muted); font-size: var(--text-md); }
.section-heading .alignment-overview { display: flex; flex-wrap: wrap; justify-content: center; gap: .5rem 1.5rem; max-width: none; font-size: .95rem; }
.alignment-overview strong { color: var(--color-accent); }
.visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; border: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip-link { position: fixed; left: 1rem; top: 1rem; z-index: 150; padding: var(--space-sm) var(--space-md); background: var(--color-ink); color: var(--color-on-dark); transform: translateY(-200%); }
.skip-link:focus { transform: translateY(0); }
.reading-progress { position: fixed; left: 0; top: 0; width: 100%; height: 3px; background: var(--color-accent); z-index: 110; transform: scaleX(0); transform-origin: left; pointer-events: none; }

/* The fixed rail follows the reference; content has its own clear left gutter. */
.masthead { position: fixed; inset: 0 0 auto; z-index: 90; min-height: 72px; padding: .75rem 1.25rem; display: flex; justify-content: space-between; align-items: center; gap: var(--space-md); color: var(--color-on-dark); }
.masthead.is-scrolled { color: var(--color-ink); background: var(--color-paper); border-bottom: 1px solid var(--color-rule); }
.wordmark { display: inline-flex; align-items: center; min-height: 44px; font-family: var(--font-display); font-weight: 800; letter-spacing: -.04em; font-size: 1.05rem; white-space: nowrap; }
.wordmark .brand-icon { flex: 0 0 30px; width: 30px; height: 32px; margin-right: .4rem; }
.wordmark span { color: var(--color-accent); }
.masthead:not(.is-scrolled) .wordmark span { color: var(--color-hero-accent); }
.header-links { display: none; align-items: center; gap: .75rem; }
.review-mark { font-size: .75rem; color: var(--color-muted); white-space: nowrap; margin-right: var(--space-sm); }
.masthead:not(.is-scrolled) .review-mark { color: var(--color-hero-muted); }
.section-nav { position: fixed; right: 16px; top: 14px; z-index: 100; }
.nav-toggle { display: inline-flex; align-items: center; gap: .65rem; min-height: 44px; padding: .45rem .85rem; border: 1px solid var(--color-rule); border-radius: var(--radius-pill); background: var(--color-paper); color: var(--color-ink); font-size: .8rem; font-weight: 600; white-space: nowrap; }
.section-links { display: none; position: absolute; right: 0; top: 56px; width: 240px; max-width: calc(100vw - 32px); padding: var(--space-sm); border: 1px solid var(--color-rule); border-radius: var(--radius-md); background: var(--color-paper); box-shadow: 0 8px 32px var(--color-shadow); }
.section-links.is-open { display: grid; }
.section-links a { display: flex; align-items: center; min-height: 44px; margin: .15rem 0; padding: .45rem .85rem; border-left: 2px solid var(--color-transparent); color: var(--color-muted); font-size: .875rem; white-space: nowrap; }
.section-links a[aria-current] { border-left-color: var(--color-accent); color: var(--color-ink); font-weight: 700; }

.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; gap: .6rem; padding: .7rem 1.4rem; background: var(--color-paper); border: 1px solid var(--color-rule); border-radius: var(--radius-pill); color: var(--color-accent); font-size: .9rem; font-weight: 600; line-height: 1.4; white-space: nowrap; }
.button.primary { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-on-dark); }
.button.small { min-height: 44px; padding: .55rem 1rem; font-size: .8rem; }
.button svg { width: 18px; height: 18px; }
.masthead:not(.is-scrolled) .button { background: var(--color-transparent); border-color: var(--color-hero-rule); color: var(--color-on-dark); }
.masthead:not(.is-scrolled) .button.primary { background: var(--color-paper); border-color: var(--color-paper); color: var(--color-accent); }

/* One full-screen, real experiment video; text remains readable over every frame. */
.hero { position: relative; display: flex; flex-direction: column; justify-content: center; min-height: 740px; min-height: 100svh; isolation: isolate; color: var(--color-on-dark); background: var(--color-dark); padding-block: 126px 130px; }
.hero-background, .hero-background video { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-background { z-index: -2; }
.hero-background video { object-fit: cover; object-position: 58% center; }
.hero::before { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(90deg, var(--color-hero-shade), var(--color-hero-shade-light)); }
.hero-content { padding-block: var(--space-lg); }
.publication-line { color: var(--color-hero-muted); margin-bottom: var(--space-lg); font-size: .8rem; letter-spacing: .035em; }
.hero h1 { font-size: var(--text-display); font-weight: 800; line-height: 1.16; letter-spacing: -.035em; max-width: 1140px; text-wrap: balance; }
.hero h1 span { color: var(--color-hero-accent); }
.hero-description { margin-top: var(--space-xl); color: var(--color-hero-muted); font-size: 1.05rem; line-height: 1.65; max-width: 1140px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-md); margin-top: var(--space-xl); }
.hero-primary { color: var(--color-accent); background: var(--color-paper); border-color: var(--color-paper); }
.hero-secondary { color: var(--color-on-dark); background: var(--color-transparent); border-color: var(--color-hero-rule); }
.hero-bottom { position: absolute; bottom: 28px; left: 20px; display: flex; justify-content: space-between; align-items: center; gap: var(--space-md); }
.scroll-cue { display: inline-flex; align-items: center; gap: var(--space-md); min-height: 44px; font-size: .75rem; color: var(--color-hero-muted); white-space: nowrap; }
.scroll-cue span { font-size: 1.15rem; }
.quiet-button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; gap: .5rem; padding: .4rem .8rem; border: 1px solid var(--color-hero-rule); border-radius: var(--radius-pill); background: var(--color-transparent); color: var(--color-on-dark); font-size: .75rem; white-space: nowrap; }
.play-icon { width: 13px; text-align: center; }

.research-summary { max-width: 840px; margin: 0 auto var(--space-2xl); font-size: 1.05rem; line-height: 1.85; color: var(--color-muted); text-align: center; }
.research-summary strong { color: var(--color-accent); font-weight: 600; }
.highlight-grid { display: grid; gap: var(--space-md); }
.highlight-card { padding: var(--space-xl); border: 1px solid var(--color-rule); border-radius: var(--radius-md); background: var(--color-paper); box-shadow: 0 5px 24px var(--color-shadow); }
.highlight-value { display: block; margin-bottom: var(--space-md); font-family: var(--font-display); font-size: 2.75rem; line-height: 1.1; letter-spacing: -.045em; font-weight: 750; color: var(--color-accent); font-variant-numeric: tabular-nums; }
.highlight-value span { font-size: 1.5rem; }
.highlight-card h3 { font-size: 1rem; margin-bottom: .6rem; }
.highlight-card p { color: var(--color-muted); font-size: .875rem; }
.disclosure { border-block: 1px solid var(--color-rule); margin-top: var(--space-xl); }
summary { display: flex; align-items: center; justify-content: space-between; gap: var(--space-md); min-height: 56px; padding: .85rem 0; list-style: none; font-size: .85rem; font-weight: 600; color: var(--color-secondary); }
summary::-webkit-details-marker { display: none; }
summary > span { color: var(--color-accent); font-size: 1.1rem; }
details[open] > summary > span { transform: rotate(45deg); }
.disclosure > p { max-width: 92ch; color: var(--color-muted); font-size: .9rem; line-height: 1.75; padding-bottom: var(--space-lg); }

/* Uniform media frames and caption bars keep the research examples comparable. */
.hero-filmstrip { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .8rem; }
.hero-film { min-width: 0; display: block; border: 1px solid var(--color-rule); border-radius: var(--radius-md); background: var(--color-paper); overflow: clip; box-shadow: 0 4px 20px var(--color-shadow); }
.film-image { position: relative; background: var(--color-dark); }
.hero-film video { aspect-ratio: 16/9; object-fit: contain; }
.film-caption { display: flex; align-items: center; justify-content: space-between; gap: .25rem; min-height: 57px; padding: .7rem .8rem; font-size: .73rem; font-weight: 650; white-space: nowrap; }
.film-caption > span:last-child { color: var(--color-accent); }
.film-badge { position: absolute; right: 8px; top: 8px; padding: .15rem .5rem; border-radius: var(--radius-pill); background: var(--color-paper); color: var(--color-secondary); font-size: .6rem; font-weight: 600; }
.subsection-heading { display: flex; justify-content: space-between; align-items: center; gap: var(--space-md); border-bottom: 1px solid var(--color-rule); padding-bottom: var(--space-lg); margin: var(--space-3xl) 0 var(--space-xl); }
.subsection-heading h3 { font-size: 1.2rem; }
.subsection-heading > span { color: var(--color-muted); font-size: .8rem; white-space: nowrap; }
.task-tabs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .6rem; }
.task-tabs button { min-height: 44px; padding: .65rem .9rem; border: 1px solid var(--color-rule); border-radius: var(--radius-pill); background: var(--color-paper); color: var(--color-muted); font-size: .8rem; line-height: 1.4; white-space: nowrap; }
.task-tabs button[aria-selected="true"] { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-on-dark); }
#demo-panel { scroll-margin-top: 100px; }
.demo-description { display: flex; justify-content: space-between; align-items: center; gap: var(--space-md); margin: var(--space-xl) 0 var(--space-lg); }
.demo-description h3 { font-size: 1.3rem; }
.task-score { flex-shrink: 0; text-align: right; font-variant-numeric: tabular-nums; }
.task-score > strong { display: block; font-family: var(--font-display); font-size: 1.8rem; font-weight: 750; color: var(--color-accent); line-height: 1.1; letter-spacing: -.045em; }
.task-score strong span { font-size: 1rem; margin-left: .1rem; }
.task-score > span { display: block; color: var(--color-muted); font-size: .68rem; margin-top: .4rem; }
.demo-videos { display: grid; gap: var(--space-lg); }
.media-card { min-width: 0; overflow: clip; border: 1px solid var(--color-rule); border-radius: var(--radius-md); background: var(--color-paper); box-shadow: 0 5px 22px var(--color-shadow); }
.video-heading { display: flex; align-items: center; justify-content: space-between; gap: .4rem; padding: .3rem .8rem; min-height: 58px; font-size: .78rem; font-weight: 650; }
.video-heading > span:first-child { display: inline-flex; align-items: center; gap: .45rem; white-space: nowrap; }
.label-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent); flex-shrink: 0; }
.human-dot { background: var(--color-muted); }
.video-detail { color: var(--color-muted); font-size: .7rem; font-weight: 400; white-space: nowrap; }
.video-frame { position: relative; background: var(--color-dark); }
.video-frame video { aspect-ratio: 16/9; }
.execution-meta { display: inline-flex; align-items: center; gap: .35rem; color: var(--color-accent); font-size: .72rem; white-space: nowrap; }
.demo-bottom { display: flex; justify-content: flex-end; align-items: center; gap: var(--space-md); margin-top: var(--space-lg); }
.demo-view-controls { display: flex; align-items: center; gap: var(--space-sm); }
.view-toggle.button { width: 44px; padding: .5rem; }
.demo-view-controls button[aria-pressed="true"] { color: var(--color-accent); background: var(--color-accent-soft); }
.media-note { margin-top: var(--space-md); color: var(--color-muted); font-size: .78rem; line-height: 1.6; }

.results-grid { display: grid; gap: var(--space-lg); }
.chart-card { min-width: 0; padding: var(--space-xl); border: 1px solid var(--color-rule); border-radius: var(--radius-md); background: var(--color-paper); box-shadow: 0 4px 24px var(--color-shadow); }
.chart-card h3 { font-size: 1.1rem; margin-bottom: .5rem; }
.chart-card > p, .chart-card figcaption p { color: var(--color-muted); font-size: .8rem; }
.bar-chart { display: grid; gap: var(--space-lg); padding-block: var(--space-xl) var(--space-md); }
.chart-row { display: grid; grid-template-columns: 80px minmax(0, 1fr) 60px; gap: .55rem; align-items: center; font-size: .75rem; }
.chart-row > span, .chart-row strong { white-space: nowrap; }
.chart-row strong { font-variant-numeric: tabular-nums; text-align: right; font-weight: 650; }
.chart-row.full > strong { color: var(--color-accent); }
.bar-track { height: 28px; border-radius: 5px; background: var(--color-surface); overflow: clip; }
.bar { display: block; width: calc(var(--value) * 1%); height: 100%; background: var(--color-accent); border-radius: 4px; }
.bar-baseline { background: var(--color-bar-baseline); }
.bar-middle { background: var(--color-bar-middle); }
.chart-scale { display: flex; justify-content: space-between; margin: 0 69px 0 89px; color: var(--color-muted); font-size: .65rem; font-variant-numeric: tabular-nums; }
.metric-pair { display: flex; align-items: center; justify-content: space-between; gap: var(--space-md); padding-top: var(--space-lg); margin-top: var(--space-lg); border-top: 1px solid var(--color-rule); }
.metric-pair > span { font-size: .8rem; color: var(--color-secondary); }
.metric-pair > div { display: flex; align-items: baseline; gap: .7rem; font-variant-numeric: tabular-nums; white-space: nowrap; }
.before-value { font-size: 1rem; color: var(--color-muted); }
.metric-arrow { color: var(--color-muted); font-size: .8rem; }
.metric-pair strong { font-family: var(--font-display); font-size: 1.6rem; font-weight: 750; letter-spacing: -.035em; color: var(--color-accent); }
.metric-pair small { font-size: .8rem; font-weight: 500; }
.table-scroll { max-width: 100%; overflow-x: auto; margin-bottom: var(--space-lg); }
table { width: 100%; border-collapse: collapse; font-size: .8rem; font-variant-numeric: tabular-nums; }
caption { text-align: left; padding-block: var(--space-sm) var(--space-md); font-size: .75rem; color: var(--color-muted); }
th, td { text-align: right; white-space: nowrap; padding: .9rem .8rem; border-bottom: 1px solid var(--color-rule); }
th:first-child { text-align: left; }
thead th { font-weight: 600; color: var(--color-muted); }
.highlight-row { background: var(--color-accent-soft); }

.experiment-toolbar { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: var(--space-lg); margin-bottom: var(--space-xl); }
.experiment-toolbar .task-tabs { flex: 1 1 100%; }
.ik-grid { display: grid; gap: var(--space-lg); }
.ik-card figcaption { min-height: 114px; display: flex; align-items: flex-start; gap: .8rem; padding: var(--space-lg); }
.variant { display: grid; place-items: center; width: 32px; height: 32px; flex-shrink: 0; background: var(--color-accent-soft); color: var(--color-accent); font-size: .8rem; font-weight: 700; border-radius: var(--radius-sm); }
.ik-card video { aspect-ratio: 64/31; }
.ik-card h3 { font-size: .95rem; margin-bottom: .5rem; }
.ik-card p { color: var(--color-muted); font-size: .78rem; line-height: 1.55; max-width: 32ch; }

.visual-pipeline { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-md); width: min(480px, 100%); margin-inline: auto; }
.visual-stage { display: flex; flex-direction: column; min-width: 0; overflow: clip; border-radius: var(--radius-md); border: 1px solid var(--color-rule); background: var(--color-paper); }
.stage-heading { flex: 1; padding: var(--space-lg) var(--space-md); }
.stage-symbol { display: block; margin-bottom: var(--space-sm); font-family: var(--font-display); font-size: .8rem; font-weight: 700; color: var(--color-accent); }
.visual-stage h3 { font-size: clamp(.8rem, 3.6vw, .95rem); line-height: 1.35; white-space: nowrap; }
.stage-image { flex-shrink: 0; height: auto; aspect-ratio: 552/310; object-fit: cover; }
.augmentation-stack { position: relative; flex-shrink: 0; aspect-ratio: 552/310; overflow: clip; background: var(--color-accent-soft); }
.augmentation-stack img { position: absolute; left: 11%; top: 11%; width: 78%; height: 78%; object-fit: cover; border: 3px solid var(--color-paper); border-radius: var(--radius-sm); box-shadow: 0 4px 14px var(--color-shadow); }
.augmentation-stack img:nth-child(1) { transform: translate(-5%, -4%) rotate(-9deg); }
.augmentation-stack img:nth-child(2) { transform: translate(3%, -2%) rotate(6deg); }
.augmentation-stack img:nth-child(3) { transform: translate(-1%, 2%) rotate(-3deg); }
.augmentation-stack img:nth-child(4) { transform: translate(3%, 3%) rotate(2deg); }
.diagram-arrow { color: var(--color-accent); text-align: center; font-size: 1.25rem; transform: rotate(90deg); line-height: 1; }

.data-gallery { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-lg); }
.data-photo { min-width: 0; overflow: clip; border: 1px solid var(--color-rule); border-radius: var(--radius-md); background: var(--color-paper); }
.data-photo-link { display: block; cursor: zoom-in; }
.data-photo img { height: auto; aspect-ratio: 16/9; object-fit: cover; }
.data-photo figcaption { padding: .9rem var(--space-lg); font-size: .9rem; font-weight: 600; }

.resource-links { display: grid; gap: var(--space-lg); max-width: 920px; margin: 0 auto; }
.resource-link { display: flex; align-items: center; gap: var(--space-lg); min-height: 120px; padding: var(--space-xl); border: 1px solid var(--color-rule); border-radius: var(--radius-md); background: var(--color-paper); box-shadow: 0 4px 24px var(--color-shadow); }
.resource-link strong { display: block; font-family: var(--font-display); font-size: 1rem; letter-spacing: -.02em; margin-bottom: .35rem; white-space: nowrap; }
.resource-link small { display: block; font-size: .75rem; color: var(--color-muted); }
.resource-icon { display: grid; place-items: center; flex-shrink: 0; width: 44px; height: 44px; color: var(--color-accent); border-radius: var(--radius-sm); background: var(--color-accent-soft); }
.resource-icon svg { width: 23px; height: 23px; }
.resource-arrow { margin-left: auto; color: var(--color-accent); font-size: 1.25rem; }
.footer { border-top: 1px solid var(--color-rule); background: var(--color-surface); padding-block: var(--space-xl); }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: var(--space-md) var(--space-xl); }
.footer p, .back-top { color: var(--color-muted); font-size: .75rem; }
.back-top { display: inline-flex; min-height: 44px; align-items: center; white-space: nowrap; }
.noscript-note { padding: var(--space-lg); text-align: center; background: var(--color-accent-soft); }
.noscript-note a { text-decoration: underline; }
.media-error { position: absolute; inset: 0; display: flex; flex-wrap: wrap; justify-content: center; align-content: center; gap: .6rem; padding: var(--space-md); background: var(--color-overlay); color: var(--color-on-dark); font-size: .85rem; text-align: center; }
.media-error p { flex-basis: 100%; }
.media-error button, .media-error a { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: .4rem .8rem; border: 1px solid var(--color-hero-rule); border-radius: var(--radius-pill); background: var(--color-transparent); color: var(--color-on-dark); font-size: .8rem; }
.media-status { position: absolute; left: .8rem; top: .8rem; padding: .3rem .6rem; border-radius: var(--radius-sm); background: var(--color-overlay); color: var(--color-on-dark); font-size: .75rem; }

@media (hover: hover) and (pointer: fine) {
  .button:hover, .nav-toggle:hover { border-color: var(--color-accent); }
  .button.primary:hover { background: var(--color-accent-hover); }
  .hero-secondary:hover { background: var(--color-hero-wash); border-color: var(--color-on-dark); }
  .hero-film:hover, .resource-link:hover { border-color: var(--color-accent-border); transform: translateY(-2px); }
  .hero-film, .resource-link { transition: transform var(--dur-fast) var(--ease-out); }
  .task-tabs button:hover:not([aria-selected="true"]) { color: var(--color-accent); border-color: var(--color-accent-border); }
  .section-links a:hover { color: var(--color-accent); border-left-color: var(--color-accent-border); }
  summary:hover, .back-top:hover { color: var(--color-accent); }
}
@media (min-width: 40rem) {
  .data-gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .wrap { width: min(1200px, calc(100% - 64px)); }
  .masthead { padding-inline: 2rem; }
  .header-links { display: flex; margin-right: 116px; }
  .header-links .review-mark { display: none; }
  .hero-bottom { left: 32px; }
  .hero-description { font-size: 1.15rem; }
  .highlight-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-lg); }
  .highlight-card { padding: var(--space-lg); }
  .hero-filmstrip { gap: var(--space-lg); }
  .film-caption { padding: var(--space-md); font-size: .875rem; }
  .task-tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: .75rem; }
  .task-tabs button { padding: .65rem 1.2rem; }
  .demo-videos { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .demo-description { margin-top: var(--space-2xl); }
  .task-score > strong { font-size: 2.1rem; }
  .start-labels { font-size: .9rem; }
  .experiment-toolbar .task-tabs { flex: 0 1 auto; justify-content: flex-start; }
  .resource-links { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .resource-link { padding: var(--space-lg); }
  .stage-heading { min-height: 110px; }
}
@media (min-width: 56rem) {
  .data-gallery { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .hero-filmstrip { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .film-caption { padding: .9rem .8rem; font-size: .8rem; }
  .results-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .chart-card { padding: var(--space-xl); }
  .ik-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .highlight-card { padding: var(--space-xl); }
  .video-heading { padding-inline: var(--space-md); font-size: .85rem; }
}
@media (min-width: 75rem) {
  .visual-pipeline { width: 100%; grid-template-columns: minmax(0, 1fr) 24px minmax(0, 1fr) 24px minmax(0, 1fr); gap: .65rem; align-items: stretch; }
  .diagram-arrow { display: grid; place-items: center; transform: none; }
  .section, .hero, .footer { padding-inline-start: 176px; }
  .header-links { margin-right: 0; }
  .header-links .review-mark { display: inline; }
  .section-nav { left: 24px; right: auto; top: 50%; transform: translateY(-50%); width: 140px; }
  .nav-toggle { display: none; }
  .section-links, .section-links.is-open { position: static; display: flex; flex-direction: column; width: auto; max-width: none; padding: 0; border: 0; border-radius: 0; background: var(--color-transparent); box-shadow: none; }
  .section-links a { padding: .55rem .85rem; font-size: .84rem; min-height: 46px; }
  .section-nav.on-hero .section-links a { color: var(--color-hero-muted); }
  .section-nav.on-hero .section-links a[aria-current] { color: var(--color-on-dark); border-left-color: var(--color-hero-accent); }
  .hero-bottom { position: absolute; left: auto; width: min(1200px, calc(100% - 240px)); align-self: center; }
  .hero-content { padding-block: var(--space-2xl); }
  .hero-description { font-size: 1.2rem; }
  .hero-actions .button { min-height: 52px; padding-inline: 1.7rem; }
  .section-heading { margin-bottom: var(--space-3xl); }
}
@media (min-width: 100rem) {
  .hero h1 { font-size: 3.8rem; }
  .film-caption { padding: var(--space-md); font-size: .875rem; }
  .video-heading { padding-inline: var(--space-lg); }
}
@media (max-width: 39.99rem) {
  .hero-actions { gap: .65rem; }
  .hero-actions .button { padding: .7rem 1.05rem; font-size: .8rem; }
  .hero-description { font-size: 1rem; }
  .hero-filmstrip { grid-template-columns: minmax(0, 1fr); }
  .film-caption { font-size: .9rem; padding-inline: var(--space-md); }
  .subsection-heading > span { display: none; }
  .demo-description { align-items: flex-start; }
  .task-score > span { max-width: 14ch; }
  .chart-card { padding: var(--space-lg); }
  .chart-row { grid-template-columns: 66px minmax(0, 1fr) 54px; gap: .4rem; font-size: .67rem; }
  .chart-scale { margin-left: 73px; margin-right: 61px; }
  .metric-pair { gap: .5rem; }
  .metric-pair > div { gap: .5rem; }
  .metric-pair strong { font-size: 1.4rem; }
  .metric-pair > span { font-size: .75rem; }
  .before-value { font-size: .85rem; }
  .resource-link { padding: var(--space-lg); gap: var(--space-md); }
  .resource-link strong { font-size: .9rem; }
  .footer-inner { justify-content: center; text-align: center; gap: var(--space-sm) var(--space-xl); }
  .footer p { flex-basis: 100%; }
}
@media (max-width: 23rem) {
  .wordmark { font-size: .95rem; }
  .video-heading { padding-inline: .5rem; font-size: .7rem; }
  .video-detail { font-size: .65rem; }
  .execution-meta { font-size: .65rem; gap: .25rem; }
  .scroll-cue { font-size: .67rem; gap: .5rem; }
  .quiet-button { font-size: .67rem; padding-inline: .6rem; }
  .task-tabs button { padding-inline: .4rem; font-size: .72rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* Local project-page update · manuscript 35fe626 · reference: EgoHumanoid.
 * Hallmark · pre-emit critique: P5 H5 E4 S5 R5 V4.
 * Preserve the blue research theme, self-hosted Manrope / DM Sans, and left rail. */
.hero h1 { max-width: none; font-size: clamp(1.85rem, 3.7vw, 3.45rem); line-height: 1.17; }
.hero h1 .hero-project { display: block; font-size: 1.16em; margin-bottom: .25em; }
.hero h1 .hero-title-rest { display: block; color: var(--color-on-dark); }
.hero h1 .keep-together { color: inherit; white-space: nowrap; }
.hero h1 .hero-emphasis { color: var(--color-hero-accent); }
.hero-description { max-width: none; width: 100%; font-size: clamp(1.1rem, 1.5vw, 1.4rem); line-height: 1.6; }
.research-summary { max-width: 1000px; line-height: 1.75; }
.paper-figure { min-width: 0; margin: 0 0 var(--space-2xl); }
.figure-zoom { display: block; cursor: zoom-in; border-radius: var(--radius-sm); }
.paper-figure img { height: auto; border-radius: var(--radius-sm); }
.figure-hint { display: block; padding-top: .6rem; text-align: right; font-size: .75rem; color: var(--color-accent); }
.overview-figure { margin-bottom: var(--space-2xl); }
.highlight-card { border: 0; border-left: 2px solid var(--color-rule); border-radius: 0; box-shadow: none; }
.highlight-value { margin-bottom: .6rem; }
.publication-details { margin-top: var(--space-xl); border-top: 1px solid var(--color-rule); }
.author-list { display: flex; flex-wrap: wrap; gap: .65rem 1.2rem; padding-block: var(--space-md); color: var(--color-ink); }
.author-list span { white-space: nowrap; font-size: .95rem; }
.author-list sup { color: var(--color-accent); font-size: .65em; margin-left: .2em; }
.affiliations { display: grid; gap: .35rem; list-style-position: inside; padding: var(--space-md) 0 var(--space-xl); margin: 0; color: var(--color-muted); font-size: .8rem; }
.scaling-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-xl) var(--space-lg); }
.scaling-chart { min-width: 0; border-bottom: 1px solid var(--color-rule); padding-bottom: var(--space-lg); }
.scaling-chart h3 { text-align: center; font-size: 1rem; margin-bottom: var(--space-md); }
.scaling-chart img { height: auto; }
.endpoint-table { margin-top: var(--space-lg); }
.endpoint-table th, .endpoint-table td { padding: .85rem .35rem; font-size: .85rem; }
.endpoint-table thead th { font-weight: 500; }
.endpoint-table thead th span { display: block; font-size: .75rem; }
.endpoint-table th:first-child { width: 35%; }
.endpoint-table td { font-size: 1.05rem; }
.endpoint-table .endpoint-best th { color: var(--color-accent); }
.endpoint-table .endpoint-best td { font-family: var(--font-display); font-size: 1.45rem; font-weight: 750; color: var(--color-accent); }
.endpoint-table tr:last-child > * { border-bottom: 0; }
.action-figure { padding: var(--space-md); border-radius: var(--radius-md); background: var(--color-paper); }
.benchmark-summary { display: grid; grid-template-columns: 1.25fr minmax(0, 1fr) minmax(0, 1fr); gap: var(--space-xl); align-items: center; border-top: 1px solid var(--color-rule); margin-top: var(--space-3xl); padding-top: var(--space-2xl); }
.benchmark-intro .section-label { margin-bottom: .85rem; }
.benchmark-intro h3 { font-size: 1.5rem; margin-bottom: .65rem; }
.benchmark-intro p { font-size: .85rem; color: var(--color-muted); }
.benchmark-metric > span { color: var(--color-muted); font-size: .9rem; }
.benchmark-metric > div { display: flex; align-items: baseline; gap: 1rem; margin-top: var(--space-sm); font-variant-numeric: tabular-nums; }
.benchmark-metric > div > span { color: var(--color-muted); font-size: 1.15rem; }
.benchmark-metric strong { color: var(--color-accent); font-family: var(--font-display); font-size: 2.25rem; letter-spacing: -.035em; }
.figure-dialog { border: 1px solid var(--color-rule); border-radius: var(--radius-md); width: min(1440px, 96vw); max-width: 96vw; max-height: 94svh; padding: var(--space-lg); background: var(--color-paper); color: var(--color-ink); }
.figure-dialog::backdrop { background: var(--color-overlay); }
.figure-dialog-toolbar { display: flex; align-items: center; justify-content: space-between; gap: var(--space-md); margin-bottom: var(--space-lg); }
.figure-dialog-toolbar p { font-size: .9rem; color: var(--color-muted); }
.figure-dialog-toolbar .button { flex-shrink: 0; }
.figure-dialog img { height: auto; }
@media (min-width: 56rem) {
  .affiliations { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: var(--space-lg); }
}
@media (min-width: 75rem) {
  .hero-content { padding-block: var(--space-lg); }
  .hero-description { margin-top: var(--space-lg); }
}
@media (max-width: 55.99rem) {
  .benchmark-summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .benchmark-intro { grid-column: 1 / -1; }
}
@media (max-width: 39.99rem) {
  .scaling-grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-xl); }
  .hero h1 { font-size: clamp(1.65rem, 6.1vw, 2.3rem); }
  .hero h1 .hero-project { font-size: 1.1em; margin-bottom: .6em; }
  .hero-description { font-size: 1.1rem; margin-top: var(--space-lg); }
  .hero { padding-block: 108px 126px; }
  .chart-card { padding: var(--space-md); }
  .endpoint-table th, .endpoint-table td { padding-inline: .2rem; font-size: .75rem; }
  .endpoint-table .endpoint-best td { font-size: 1.25rem; }
  .endpoint-table thead th { font-size: .7rem; }
  .benchmark-summary { gap: var(--space-lg); }
  .benchmark-metric > div { gap: .5rem; }
  .benchmark-metric strong { font-size: 1.85rem; }
  .benchmark-metric > div > span { font-size: .9rem; }
  .benchmark-metric > span { font-size: .8rem; }
  .action-figure { padding: var(--space-sm); }
  .figure-dialog { padding: var(--space-md); }
  .figure-dialog-toolbar p { font-size: .8rem; }
}

.figure-dialog-actions { display: flex; flex-shrink: 0; gap: .6rem; }
@media (min-width: 90rem) { .scaling-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-lg); } }
@media (max-width: 39.99rem) { .figure-dialog-toolbar { justify-content: flex-end; } .figure-dialog-toolbar p { display: none; } }

.header-links [aria-disabled="true"] { cursor: default; }
.header-links .coming-soon { font-size: .65rem; opacity: .7; }

.institution-logos { display: flex; align-items: center; gap: 12px; }
.institution-logos a { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; }
.institution-logos img { width: 32px; height: 32px; object-fit: contain; }
.institution-logos > span { color: currentColor; opacity: .35; font-size: 18px; }

/* Fade the cover into the first white section. */
.hero::after { content: ""; position: absolute; inset: auto 0 0; height: clamp(150px, 24vh, 280px); z-index: -1; pointer-events: none; background: linear-gradient(to bottom, transparent 0%, rgb(255 255 255 / .3) 42%, rgb(255 255 255 / .78) 76%, var(--color-paper) 100%); }
.hero-bottom, .hero-bottom .quiet-button { color: var(--color-ink); }
.hero-bottom .quiet-button { border-color: var(--color-rule); }
.hero-actions [aria-disabled="true"] { cursor: default; }

.hero-bottom .scroll-cue { color: var(--color-ink); }

.footer { padding: 64px 0; }
.footer-inner { justify-content: space-between; text-align: left; gap: 28px; }
.footer-brand { color: var(--color-accent); font-family: var(--font-display); font-size: 24px; font-weight: 800; letter-spacing: -.035em; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 32px; align-items: center; }
.footer-nav a { color: var(--color-muted); font-size: 14px; }
.footer-nav a:hover { color: var(--color-accent); }
@media (max-width: 600px) { .footer { padding-block: 40px; } .footer-inner { flex-direction: column; align-items: flex-start; } .footer-nav { gap: 16px 24px; } }

/* Hallmark · task comparison matrix + synchronized pipeline · P5 H5 E4 S5 R5 V4 */
.task-matrix-row + .task-matrix-row { margin-top: 56px; }
.matrix-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-bottom: 20px; margin-bottom: 26px; border-bottom: 1px solid var(--color-rule); }
.matrix-heading h3 { font-size: clamp(1.1rem, 2vw, 1.5rem); }
.matrix-heading p { color: var(--color-muted); margin-top: 4px; font-size: .85rem; }
.task-matrix-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.matrix-card { margin: 0; }
.matrix-card figcaption { text-align: center; padding: 15px 8px; font-weight: 700; font-size: .9rem; }
.matrix-card video { display: block; width: 100%; aspect-ratio: 16/9; object-fit: contain; }
.matrix-play { flex-shrink: 0; white-space: nowrap; }
.motion-canvas { position: relative; isolation: isolate; }
.motion-canvas > img { display: block; width: 100%; }
.flow-overlay { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; overflow: visible; }
.flow-streams, .refine-loop { fill: none; stroke: var(--color-accent); stroke-width: 5; stroke-linecap: round; stroke-dasharray: 8 18; animation: stream-flow 1.6s linear infinite; }
.refine-loop { stroke-width: 4; animation-duration: 2.8s; }
.tracking-points { fill: none; stroke: var(--color-accent); stroke-width: 3; animation: tracking-pulse 2s ease-in-out infinite; }
.tracking-tip { fill: var(--color-accent); stroke: var(--color-paper); stroke-width: 2; }
.stage-spotlight { fill: var(--color-accent-soft); fill-opacity: .12; stroke: var(--color-accent); stroke-width: 3; stroke-dasharray: 8 6; transition: x .5s ease, width .5s ease; }
.motion-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 18px; }
.motion-toolbar > span { color: var(--color-secondary); font-size: .85rem; }
.motion-toolbar .button { flex-shrink: 0; white-space: nowrap; }
.alignment-steps { display: flex; flex-wrap: wrap; gap: 8px; }
.alignment-step { border: 1px solid var(--color-rule); border-radius: var(--radius-pill); padding: 10px 14px; background: var(--color-paper); color: var(--color-secondary); font: inherit; font-size: .8rem; white-space: nowrap; cursor: pointer; }
.alignment-step.is-active { color: var(--color-paper); background: var(--color-accent); border-color: var(--color-accent); }
.live-metrics { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-top: 24px; padding: 24px 0; border-block: 1px solid var(--color-rule); }
.live-metrics > div { text-align: center; }
.live-metrics span { display: block; color: var(--color-secondary); font-size: .85rem; }
.live-metrics strong { display: block; color: var(--color-accent); font-size: clamp(1.4rem, 3vw, 2.4rem); font-variant-numeric: tabular-nums; }
.live-metrics small { font-size: .5em; font-weight: 500; }
.chart-row, .endpoint-table tbody tr { transition: background .4s, opacity .4s; }
.stage-selected { background: var(--color-accent-soft); }
.motion-paused * { animation-play-state: paused !important; }
@keyframes stream-flow { to { stroke-dashoffset: -104; } }
@keyframes tracking-pulse { 50% { opacity: .35; stroke-width: 6; } }
@media (max-width: 900px) { .task-matrix-grid { gap: 12px; } .matrix-card figcaption { font-size: .75rem; } .motion-toolbar { flex-wrap: wrap; } }
@media (max-width: 600px) { .task-matrix-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .matrix-heading { align-items: flex-start; gap: 12px; } .matrix-heading p { font-size: .75rem; } .matrix-play { padding-inline: 12px; } .live-metrics { gap: 8px; } .live-metrics span { font-size: .7rem; } .alignment-step { font-size: .7rem; padding: 8px 10px; } }
@media (prefers-reduced-motion: reduce) { .flow-overlay *, .stage-spotlight { animation: none; transition: none; } }

.pose-trace { fill: none; stroke: var(--color-accent); stroke-width: 4; stroke-linecap: round; stroke-linejoin: round; opacity: .6; }

.contribution-list { margin: 0 auto 40px; padding-left: 1.3em; max-width: 1080px; font-size: clamp(1rem, 1.3vw, 1.15rem); line-height: 1.8; }
.contribution-list li + li { margin-top: 12px; }
.contribution-list strong { color: var(--color-accent); font-weight: 700; }
.overview-video { margin: 40px 0 0; border-radius: var(--radius-md); overflow: hidden; }
.overview-video video { display: block; width: 100%; aspect-ratio: 16 / 9; }

/* Five navigation groups; real poster images remain visible during media loading. */
.poster-shell { position: relative; }
.video-thumbnail { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; pointer-events: none; z-index: 1; }
.hero-background .video-thumbnail { object-fit: cover; object-position: 58% center; }
.poster-pending { opacity: 0; }
.video-ready > .video-thumbnail { visibility: hidden; }
.video-ready > video { opacity: 1; }
.workflow-number { color: var(--color-accent); margin-right: 8px; font-size: .75rem; }
.visual-workflow:first-of-type { margin-top: 32px; }
.visual-workflow .matrix-card figcaption { font-size: .78rem; }
.workflow-notes { margin-top: 24px; color: var(--color-muted); font-size: .8rem; }
.workflow-notes p { margin-top: 12px; max-width: 85ch; }
html, body { overflow-x: clip; }
@media (max-width: 600px) {
  .section { padding-block: 48px; }
  .hero h1 .hero-project { overflow-wrap: anywhere; }
  .hero-description { font-size: 1rem; }
  .hero-actions { gap: 10px; }
  .hero-actions .button { padding-inline: 14px; font-size: .78rem; white-space: nowrap; }
  .section-heading { margin-bottom: 28px; }
  .task-matrix-row + .task-matrix-row { margin-top: 36px; }
  .matrix-heading h3 { font-size: 1rem; }
  .task-matrix-grid { gap: 14px; }
  .visual-workflow .task-matrix-grid { grid-template-columns: minmax(0, 1fr); }
  .visual-workflow .matrix-card figcaption { text-align: left; padding-inline: 16px; }
  .matrix-play, .motion-toolbar .button { min-height: 44px; }
  .footer-nav a { min-height: 44px; display: inline-flex; align-items: center; }
}
.hero-background.poster-shell { position: absolute; }

/* Edge-to-edge grid media; spacing belongs between cards, not inside them. */
.matrix-card .video-frame { aspect-ratio: 16 / 9; overflow: hidden; padding: 0; background: var(--color-surface); }
.matrix-card .video-frame video,
.matrix-card .video-thumbnail { display: block; width: 100%; height: 100%; object-fit: cover; object-position: center; }