/* Paper palette and typography shared with the AaltoML LOOK project page. */
@font-face {
  font-family: 'Cormorant Garamond';
  src: url('assets/fonts/CormorantGaramond-Variable.woff2') format('woff2');
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('assets/fonts/InterVariable.woff2') format('woff2');
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}
:root {
  --bg: #f5f2ea;
  --paper: #fffdf8;
  --ink: #2b302b;
  --text: #3c423b;
  --muted: #6c7068;
  --line: rgba(58, 66, 52, .14);
  --accent: #4c6257;
  --hover: #2d493b;
  --alternate: #eeece4;
  --shadow: 0 18px 50px rgba(55, 59, 45, .06);
  --display: 'Cormorant Garamond', Georgia, serif;
  --body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --prose-width: 850px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--navigation-offset, 106px); }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font: 17px/1.75 var(--body);
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}
a { color: var(--accent); text-decoration-thickness: .08em; text-underline-offset: .18em; }
a:hover { color: var(--hover); }
a:focus-visible, button:focus-visible, .gallery-scroll:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 5px;
}
button { font: inherit; cursor: pointer; }
img { display: block; max-width: 100%; height: auto; }
svg { display: block; }
main, footer { max-width: 1180px; padding-inline: 22px; margin-inline: auto; }
.container { width: 100%; max-width: 1060px; margin-inline: auto; }
.text-container { max-width: var(--prose-width); }
p { margin: 0 0 24px; }
.prose { max-width: var(--prose-width); margin-inline: auto; }
.abstract-section p, .prose, .motivation-box p, .covariance-explanation p { text-align: justify; }
.content-card {
  padding: 28px clamp(20px, 4vw, 40px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: var(--shadow);
}
.content-card > p { max-width: var(--prose-width); margin-inline: auto; }
.content-card > p:last-child, .prose > p:last-child { margin-bottom: 0; }

/* Sticky navigation uses the same pills and active-section treatment as LOOK. */
.research-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  max-width: 1180px;
  min-height: 76px;
  margin: 0 auto;
  padding: 10px 22px;
  border-block: 1px solid var(--line);
  background: rgba(239, 235, 225, .94);
  backdrop-filter: blur(14px);
}
.research-nav > a { display: inline-flex; align-items: center; gap: 8px; color: var(--accent); font-size: 15px; font-weight: 700; text-decoration: none; }
.research-nav svg { width: 18px; height: 18px; stroke: currentColor; stroke-width: 1.7; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.section-nav { display: flex; justify-content: center; flex-wrap: wrap; gap: 6px 10px; }
.section-nav a {
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 6px 12px;
  color: var(--accent);
  font-size: 15px;
  font-weight: 750;
  text-decoration: none;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.section-nav a:hover, .section-nav a.active { color: var(--hover); background: rgba(76, 98, 87, .12); border-color: rgba(76, 98, 87, .16); }

.publication-header { text-align: center; padding: 78px 0 48px; }
h1 { max-width: 1080px; margin: 0 auto 30px; color: var(--accent); font: 600 clamp(3rem, 6.6vw, 5.4rem)/.98 var(--display); letter-spacing: -.04em; }
.publication-authors { max-width: 990px; margin-inline: auto; color: var(--ink); font-size: 17px; line-height: 1.9; }
.publication-authors > span { display: inline-block; margin-right: 5px; }
.publication-authors a { color: var(--ink); text-decoration: none; }
.publication-authors a:hover { color: var(--accent); text-decoration: underline; }
sup { font-size: .68em; line-height: 0; vertical-align: super; color: var(--muted); }
.publication-authors sup { margin-left: 2px; }
.publication-affiliations { color: var(--muted); font-size: 14px; line-height: 1.7; margin: 17px auto; }
.publication-affiliations p { margin: 5px 0; }
.publication-affiliations span { display: inline-block; }
.publication-affiliations sup { margin-right: 3px; }
.publication-venue { display: inline-block; color: var(--accent); font-size: 15px; font-weight: 650; margin: 12px 0 0; letter-spacing: .04em; }
.publication-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin: 25px 0 0; }
.resource-button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 20px; color: var(--ink); background: transparent; border: 1px solid var(--accent); border-radius: 999px; font-size: 15px; font-weight: 650; text-decoration: none; transition: transform .2s ease, background .2s ease; }
.resource-button:first-child { background: var(--accent); color: #fff; }
.resource-button:hover { transform: translateY(-2px); background: rgba(76, 98, 87, .08); color: var(--ink); }
.resource-button:first-child:hover { background: var(--hover); color: #fff; }
.resource-button svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.arxiv-icon { font: italic 19px/1 Georgia, serif; }

figure { margin: 28px 0 0; }
figcaption { max-width: var(--prose-width); margin: 16px auto 0; color: var(--muted); font-size: 14px; line-height: 1.6; text-align: center; }
.teaser { max-width: 940px; padding: 0 0 52px; }
.teaser figure { margin: 0; }
.teaser img { width: 100%; padding: clamp(16px, 3vw, 30px); background: var(--paper); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); }
.teaser figcaption { font-size: 15px; }
.section { margin: 0 auto 56px; }
h2 { max-width: 920px; margin: 0 auto 28px; color: var(--accent); font: 600 clamp(2.2rem, 4vw, 3.4rem)/1.05 var(--display); letter-spacing: -.03em; text-align: center; }
h2::after { content: ''; display: block; width: 86px; height: 2px; margin: 18px auto 0; background: var(--accent); }
h3 { margin: 32px auto 18px; color: var(--accent); font: 600 clamp(1.8rem, 3vw, 2.4rem)/1.15 var(--display); text-align: center; }
.theory-section .prose:first-child h3 { margin-top: 4px; }
.abstract-section p { line-height: 1.85; }
.motivation-box { max-width: var(--prose-width); margin-inline: auto; padding: 24px 28px; background: var(--paper); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 18px; }
.motivation-box p { margin: 0; }
.tldr-label { color: var(--accent); font-weight: 750; }
.sample-figure { padding: 24px 20px; background: var(--paper); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); }
.gallery-scroll { overflow-x: auto; padding: 4px 3px 12px; scrollbar-color: #b0b9ac #eeece4; }
.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; color: var(--muted); font-size: 12px; font-weight: 500; }
.sample-row-label { text-align: right; padding-right: 10px; color: var(--text); font-size: 12px; line-height: 1.65; }
.sample-preview { display: block; width: 100%; padding: 0; background: var(--paper); border: 1px solid var(--line); 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(--accent); box-shadow: 0 3px 12px #2b302b18; }
.sample-preview.marked-error { border: 2px solid #d33b43; }

.equation-panel { display: flex; align-items: center; justify-content: center; position: relative; gap: 20px; max-width: 880px; margin: 24px auto; padding: 26px 42px; background: #f5f2ea; border: 1px solid var(--line); border-radius: 14px; overflow-x: auto; }
math { font-size: 24px; color: var(--ink); margin: 0; flex-shrink: 0; }
.equation-number { position: absolute; right: 17px; color: var(--muted); font-size: 12px; }
.covariance-explanation { display: grid; grid-template-columns: 1fr 1fr; max-width: var(--prose-width); gap: 24px; margin: 29px auto 0; }
.covariance-explanation > div { padding: 21px 24px; border-left: 3px solid var(--accent); background: #eeeee5; border-radius: 0 12px 12px 0; }
.theory-label { display: block; color: var(--accent); font-size: 12px; font-weight: 650; margin-bottom: 10px; }
.covariance-explanation p { margin-bottom: 8px; font-size: 15px; }
.covariance-explanation p:last-child { margin: 0; font-size: 14px; }
.theory-section .equation-panel:last-child { margin-bottom: 0; }
.experiments-section { margin-bottom: 56px; }
.experiment-subsection { margin: 0 auto 28px; }
.experiment-subsection .container > h3 { max-width: var(--prose-width); margin: 0 auto 22px; }
.experiment-subsection:nth-of-type(even) .content-card { background: var(--alternate); }
.table-container { max-width: 760px; overflow-x: auto; margin: 26px auto 0; }
table { width: 100%; border-collapse: collapse; color: var(--ink); font-size: 15px; line-height: 1.6; font-variant-numeric: tabular-nums; }
caption { margin-bottom: 14px; color: var(--muted); text-align: left; font-size: 13px; }
th, td { padding: 14px 20px; text-align: center; white-space: nowrap; }
thead { border-top: 2px solid var(--accent); border-bottom: 1px solid var(--line); }
thead th { font-weight: 650; }
thead th:first-child, tbody th { text-align: left; }
tbody th { font-weight: 400; }
tbody tr { border-bottom: 1px solid var(--line); }
tbody tr:last-child { border-bottom: 2px solid var(--accent); }
td strong { color: var(--accent); font-weight: 700; }
.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 .text-container { max-width: 930px; }
.bibtex-section .content-card { background: var(--alternate); }
.citation-actions { display: flex; align-items: center; gap: 18px; margin-bottom: 17px; font-size: 13px; }
.citation-actions button { padding: 8px 14px; color: var(--ink); background: var(--paper); border: 1px solid var(--accent); border-radius: 999px; font-size: 13px; }
.citation-actions button:hover { background: rgba(76, 98, 87, .08); }
pre { margin: 0; padding: 20px 24px; background: var(--paper); border: 1px solid var(--line); border-radius: 14px; overflow-x: auto; font: 13px/1.8 ui-monospace, SFMono-Regular, Consolas, 'Liberation Mono', monospace; tab-size: 2; }
footer { padding-top: 24px; padding-bottom: 32px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
footer p { margin: 0; text-align: center; }
dialog { width: min(520px, calc(100% - 32px)); padding: 30px; color: var(--text); background: var(--paper); border: 1px solid var(--line); border-radius: 22px; box-shadow: 0 20px 70px #2b302b40; }
dialog::backdrop { background: #2b302b99; backdrop-filter: blur(4px); }
#close-sample { position: absolute; top: 10px; right: 13px; padding: 0 7px; color: var(--muted); background: none; border: 0; font-size: 27px; }
#sample-dialog-title { margin-bottom: 18px; padding-right: 20px; font-size: 13px; line-height: 1.6; }
#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: -80px; left: 16px; z-index: 30; padding: 8px 16px; background: var(--paper); }
.skip-link:focus { top: 8px; }
@media (max-width: 760px) {
  main, footer { padding-inline: 18px; }
  body { font-size: 16px; }
  .research-nav { flex-direction: column; gap: 4px; padding: 8px 12px; }
  .research-nav > a { font-size: 13px; }
  .section-nav { gap: 4px 6px; }
  .section-nav a { padding: 5px 9px; font-size: 13px; }
  .publication-header { padding: 50px 0 38px; }
  .publication-authors { font-size: 16px; }
  .publication-affiliations { font-size: 13px; }
  .content-card { padding: 24px 20px; }
  .teaser { padding-bottom: 38px; }
  .teaser img { border-radius: 18px; }
  .section { margin-bottom: 42px; }
  .sample-figure { padding: 20px 12px; }
  .motivation-box { padding: 20px; }
  .covariance-explanation { grid-template-columns: 1fr; gap: 14px; }
  .equation-panel { padding: 20px 35px 20px 20px; justify-content: flex-start; }
  math { font-size: 20px; }
  th, td { padding: 12px 14px; font-size: 13px; }
  figcaption { font-size: 12px; text-align: left; }
  pre { padding: 16px; font-size: 12px; }
}
@media (max-width: 460px) {
  main, footer { padding-inline: 16px; }
  h1 { font-size: clamp(2.7rem, 11vw, 3.5rem); }
  .publication-header { padding-top: 38px; }
  .section-nav { gap: 3px; }
  .section-nav a { padding: 5px 7px; font-size: 12px; }
  .resource-button { padding: 9px 15px; font-size: 14px; }
  .content-card { padding: 22px 16px; border-radius: 18px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .section-nav a, .resource-button { transition: none; }
  .resource-button:hover { transform: none; }
}
@media print {
  body { background: #fff; }
  .research-nav, .skip-link { display: none; }
  .publication-header { padding-top: 0; }
  .content-card, .teaser img, .sample-figure { box-shadow: none; }
}