@font-face {
  font-family: 'Inter';
  src: url('assets/fonts/InterVariable.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
:root {
  --prose-width: 850px;
  --text: #384355;
  --heading: #16243a;
  --link: #2865bb;
  --muted: #677386;
  --line: #dfe6ef;
  --section: #f6f8fb;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 90px; }
body {
  margin: 0;
  color: var(--text);
  background: #fff;
  font: 17px/1.8 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-decoration: none; text-underline-offset: 4px; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, .gallery-scroll:focus-visible {
  outline: 3px solid #588cdf;
  outline-offset: 4px;
}
button { font: inherit; cursor: pointer; }
img { display: block; max-width: 100%; height: auto; }
svg { display: block; }
figure { margin: 30px 0 0; }
figcaption {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  text-align: center;
  margin: 20px auto 0;
  max-width: 850px;
}
.container { width: min(1100px, calc(100% - 64px)); margin-inline: auto; }
.text-container { max-width: var(--prose-width); }
.research-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #ffffffed;
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 12px #16243a0a;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: 1100px;
  margin: auto;
  min-height: 68px;
  padding-inline: 20px;
  font-size: 17px;
  font-weight: 600;
  border-bottom: 1px solid #eef1f6;
}
.research-nav > a { display: flex; align-items: center; gap: 9px; color: var(--link); }
.research-nav svg { width: 17px; height: 17px; stroke: currentColor; stroke-width: 1.7; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.section-nav { display: flex; gap: 26px; }
.section-nav a { color: var(--link); }
.publication-header { text-align: center; padding: 58px 0 28px; }
h1 {
  color: var(--heading);
  font-size: clamp(36px, 4.7vw, 56px);
  line-height: 1.16;
  font-weight: 650;
  letter-spacing: -1.7px;
  margin: 0 auto 28px;
  max-width: 1040px;
}
.publication-authors { font-size: 19px; line-height: 1.95; margin-inline: auto; max-width: 960px; }
.publication-authors > span { display: inline-block; margin-right: 4px; }
.publication-authors sup { font-size: 11px; margin-left: 2px; }
.publication-affiliations { color: var(--muted); font-size: 14px; line-height: 1.7; margin: 20px 0; }
.publication-affiliations p { margin: 5px 0; }
.publication-affiliations sup { font-size: 10px; margin-right: 3px; }
.publication-venue {
  display: inline-block;
  font-size: 16px;
  letter-spacing: .2px;
  color: var(--link);
  font-weight: 600;
  background: #edf4ff;
  border: 1px solid #dae7fa;
  border-radius: 8px;
  padding: 5px 17px;
  margin: 4px 0 13px;
}
.publication-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin: 13px 0 10px; }
.resource-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  line-height: 1.4;
  color: #fff;
  background: #233248;
  border-radius: 999px;
  padding: 12px 21px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 3px 8px #18284212;
}
.resource-button:hover { background: #354862; text-decoration: none; }
.resource-button svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linejoin: round; stroke-linecap: round; }
.arxiv-icon { font-size: 19px; font-family: Georgia, serif; line-height: 1; font-style: italic; }
.teaser { padding: 22px 0 56px; }
.teaser figure { margin: 0; }
.teaser img { width: 100%; max-width: 880px; margin-inline: auto; }
.teaser figcaption { font-size: 16px; color: var(--text); max-width: 850px; }
.section { padding: 58px 0; }
.abstract-section { background: var(--section); border-block: 1px solid #edf1f6; }
h2 { color: var(--heading); font-size: 33px; line-height: 1.25; font-weight: 650; letter-spacing: -.7px; margin: 0 0 29px; text-align: center; }
h3 { color: var(--heading); font-size: 23px; line-height: 1.4; font-weight: 600; letter-spacing: -.35px; margin: 42px 0 18px; }
h3:first-of-type { margin-top: 24px; }
p { margin: 0 0 20px; }
.abstract-section p { text-align: justify; margin: 0; line-height: 1.9; }
.prose { max-width: var(--prose-width); margin-inline: auto; line-height: 1.85; }
.sample-figure { margin: 32px auto 0; }
.gallery-scroll { overflow-x: auto; padding: 4px 3px 12px; scrollbar-color: #b4c5dd #f0f4f9; }
.celeba-grid, .hands-grid {
  display: grid;
  align-items: center;
  gap: 10px;
  min-width: 870px;
}
.celeba-grid { grid-template-columns: 86px repeat(9, minmax(0, 1fr)); }
.hands-grid { grid-template-columns: 86px repeat(10, minmax(0, 1fr)); }
.sample-header { text-align: center; font-size: 12px; color: var(--muted); font-weight: 500; }
.sample-row-label { text-align: right; padding-right: 10px; font-size: 12px; line-height: 1.65; color: var(--text); }
.sample-preview {
  display: block;
  width: 100%;
  padding: 0;
  background: #fff;
  border: 1px solid #dfe5ec;
  border-radius: 5px;
  overflow: hidden;
  line-height: 0;
}
.sample-preview img { width: 100%; aspect-ratio: 1; object-fit: cover; }
.sample-preview:hover { border-color: var(--link); box-shadow: 0 3px 12px #192f4a18; }
.sample-preview.marked-error { border: 2px solid #d33b43; }
.theory-section { background: #f8faff; border-block: 1px solid #e5ecf6; }
.equation-panel { display: flex; align-items: center; justify-content: center; position: relative; gap: 20px; max-width: 880px; margin: 24px auto; padding: 26px 42px; background: #fff; border: 1px solid #dce5f1; border-radius: 10px; overflow-x: auto; }
math { font-size: 24px; color: var(--heading); margin: 0; flex-shrink: 0; }
.equation-number { position: absolute; right: 17px; font-size: 12px; color: var(--muted); }
.covariance-explanation { display: grid; grid-template-columns: 1fr 1fr; max-width: 850px; gap: 24px; margin: 29px auto 36px; }
.covariance-explanation > div { padding: 21px 24px; border-left: 3px solid #8caee0; background: #edf3fd; border-radius: 0 8px 8px 0; }
.theory-label { display: block; color: var(--link); font-size: 12px; font-weight: 600; margin-bottom: 10px; }
.covariance-explanation p { font-size: 15px; margin-bottom: 8px; }
.covariance-explanation p:last-child { margin: 0; font-size: 14px; line-height: 1.8; }
.experiments-section { background: #fff; }
.experiment-subsection .container > h3 { max-width: var(--prose-width); margin: 0 auto 18px; }
.table-container { overflow-x: auto; max-width: 760px; margin: 26px auto 0; }
table { width: 100%; border-collapse: separate; border-spacing: 0; color: var(--text); font-size: 15px; background: #fff; }
caption { font-size: 13px; text-align: left; margin-bottom: 12px; color: var(--muted); }
th, td { padding: 14px 20px; border-bottom: 1px solid var(--line); text-align: center; white-space: nowrap; }
thead th { font-weight: 600; color: var(--heading); background: #f3f6fb; border-top: 1px solid var(--line); }
thead th:first-child { border-top-left-radius: 8px; }
thead th:last-child { border-top-right-radius: 8px; }
thead th:first-child, tbody th { text-align: left; }
tbody th { font-weight: 400; }
td strong { color: var(--link); font-weight: 650; }
.training-figure { max-width: 780px; margin-inline: auto; }
.training-figure img { width: 100%; }
.experiments-section figure:not(.hands-figure):not(.training-figure) { max-width: 950px; margin-inline: auto; }
.hands-figure { margin-bottom: 30px; }
.bibtex-section { background: var(--section); border-top: 1px solid #edf1f6; }
.bibtex-section h2 { text-align: left; }
.reference { font-size: 15px; line-height: 1.85; }
.citation-actions { display: flex; align-items: center; gap: 18px; margin-bottom: 17px; font-size: 13px; }
.citation-actions button { border: 1px solid #cbd6e5; color: var(--heading); background: #fff; border-radius: 6px; padding: 8px 14px; font-size: 13px; }
.citation-actions button:hover { background: #edf3fc; }
pre { background: #fff; border: 1px solid var(--line); padding: 25px 27px; margin: 0; overflow-x: auto; font: 13px/1.85 ui-monospace, SFMono-Regular, Consolas, 'Liberation Mono', monospace; border-radius: 10px; }
footer { padding: 34px 0; font-size: 13px; color: var(--muted); line-height: 1.85; }
footer p:last-child { margin: 0; }
dialog { width: min(520px, calc(100% - 32px)); border: 1px solid #dce3ee; border-radius: 15px; padding: 30px; color: var(--text); box-shadow: 0 20px 70px #101e3440; }
dialog::backdrop { background: #0e1a2b99; backdrop-filter: blur(4px); }
#close-sample { position: absolute; top: 10px; right: 13px; border: 0; background: none; color: var(--muted); font-size: 27px; padding: 0 7px; }
#sample-dialog-title { font-size: 13px; line-height: 1.6; padding-right: 20px; margin-bottom: 18px; }
#sample-dialog-image { width: 100%; border-radius: 6px; }
#sample-dialog-image.marked-error { border: 3px solid #d33b43; }
.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; top: 8px; left: 8px; padding: 10px; background: #263a55; color: #fff; transform: translateY(-150%); z-index: 10; }
.skip-link:focus { transform: translateY(0); }
@media (max-width: 760px) {
  .container { width: calc(100% - 36px); }
  .research-nav { min-height: 64px; font-size: 14px; padding-inline: 18px; }
  .section-nav { gap: 14px; }
  .publication-header { padding-top: 37px; }
  h1 { font-size: 39px; letter-spacing: -1px; margin-bottom: 22px; }
  .publication-authors { font-size: 16px; line-height: 1.95; }
  .publication-affiliations { font-size: 12px; }
  .publication-venue { font-size: 14px; }
  .teaser { padding-bottom: 35px; }
  .teaser figcaption { font-size: 14px; }
  .section { padding: 40px 0; }
  h2 { font-size: 29px; }
  h3 { font-size: 21px; margin-top: 31px; }
  body { font-size: 15px; }
  .prose, .abstract-section p { font-size: 15px; }
  th, td { padding: 12px 14px; font-size: 13px; }
  figcaption { font-size: 12px; text-align: left; }
  pre { padding: 20px 17px; font-size: 11px; }
  .covariance-explanation { grid-template-columns: 1fr; gap: 14px; }
  .equation-panel { padding: 20px 35px 20px 20px; justify-content: flex-start; }
  math { font-size: 20px; }
}
@media (max-width: 420px) {
  h1 { font-size: 33px; }
  .section-nav a:first-child { display: none; }
  .section-nav { gap: 12px; }
  .publication-authors { font-size: 15px; }
  .resource-button { padding: 10px 16px; font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

.motivation-box {
  max-width: var(--prose-width);
  margin-inline: auto;
  padding: 24px 28px;
  border: 1px solid #d6e4f6;
  border-left: 4px solid var(--link);
  border-radius: 10px;
  background: #f3f7fe;
  line-height: 1.85;
}
.motivation-box p { margin: 0; }
.tldr-label { color: var(--link); font-weight: 750; }
@media (max-width: 760px) { .motivation-box { padding: 20px; } }

.abstract-section p, .prose, .motivation-box p, .covariance-explanation p, .reference { text-align: justify; }
.reference { max-width: var(--prose-width); margin-inline: auto; }

.experiments-section { padding-bottom: 0; }
.experiment-subsection { padding: 44px 0; background: #fff; }
.experiment-subsection:nth-of-type(even) { background: #f3f7fe; }
@media (max-width: 760px) { .experiment-subsection { padding: 32px 0; } }

.publication-affiliations span { display: inline-block; }
@media (max-width: 420px) { .research-nav { font-size: 13px; gap: 10px; } }