:root {
  --bg: #fcfcfb;
  --surface: #ffffff;
  --surface-alt: #f5f7f8;
  --header-bg: #fcfcfb;
  --text: #1c2733;
  --muted: #596775;
  --border: #d6dde3;
  --border-strong: #8493a0;
  --link: #1d5274;
  --link-hover: #123b58;
  --button-bg: #1d5274;
  --button-text: #ffffff;
  --button-border: #1d5274;
  --max-width: 1120px;
  --radius: 0;
  font-family: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
}

html[data-theme="dark"] {
  --bg: #25282b;
  --surface: #2c3034;
  --surface-alt: #353a3f;
  --header-bg: #25282b;
  --text: #f0f2f4;
  --muted: #c1c7cd;
  --border: #4b5259;
  --border-strong: #858e97;
  --link: #9acced;
  --link-hover: #c7e7f8;
  --button-bg: #8fc7ea;
  --button-text: #25282b;
  --button-border: #8fc7ea;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--link-hover);
}

main,
footer {
  width: min(var(--max-width), calc(100% - 32px));
  margin: 0 auto;
}

.paper-hero {
  max-width: 1000px;
  padding: 58px 0 38px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 1080px;
  margin: 0 0 18px;
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  line-height: 1.04;
  letter-spacing: 0;
  font-weight: 600;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(1.42rem, 4vw, 2.05rem);
  line-height: 1.18;
  font-weight: 500;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.05rem;
  font-weight: 650;
}

.lead,
.authors,
.venue,
.split p,
.video-heading p,
figcaption,
.method-card p,
.result-card span {
  color: var(--muted);
}

.lead {
  max-width: 900px;
  margin: 0 0 24px;
  font-size: clamp(1.05rem, 2vw, 1.2rem);
}

.authors,
.author-affiliations,
.author-note {
  max-width: 980px;
}

.author-affiliations,
.author-note {
  margin-bottom: 8px;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.9rem;
}

.author-note {
  margin-bottom: 24px;
  font-size: 0.82rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 10px;
}

.resource-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 18px;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.9rem;
}

.project-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 22px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.88rem;
}

.button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--button-bg);
  border-radius: var(--radius);
  padding: 8px 14px;
  color: var(--button-text);
  background: var(--button-bg);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
}

.button.secondary {
  border-color: var(--button-border);
  color: var(--link);
  background: transparent;
}

.visual-hero,
.method-card,
.result-card,
figure,
.video-group,
.citation {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.visual-hero {
  padding: 18px;
  overflow: hidden;
}

.visual-hero img,
.method-card img,
figure img {
  width: 100%;
  height: auto;
  display: block;
}

video {
  width: 100%;
  display: block;
}

.section {
  padding: 54px 0;
  border-top: 1px solid var(--border);
}

.split,
.video-heading {
  display: grid;
  grid-template-columns: minmax(190px, 0.32fr) minmax(0, 0.68fr);
  gap: 42px;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.method-card {
  padding: 16px;
}

.method-card img {
  margin-bottom: 14px;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.result-card {
  padding: 16px;
}

.result-card strong,
.result-card span {
  display: block;
}

.table-wrap {
  margin-top: 22px;
  overflow-x: auto;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.summary-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  color: var(--muted);
  font-size: 0.88rem;
}

.summary-table caption {
  padding: 14px 0 10px;
  color: var(--muted);
  text-align: left;
}

.summary-table th,
.summary-table td {
  border-top: 1px solid var(--border);
  padding: 9px 10px;
  text-align: left;
  vertical-align: top;
}

.summary-table thead th {
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.78rem;
}

.summary-table tbody th {
  color: var(--text);
  font-weight: 650;
}

.figure-stack {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.results-figures {
  grid-template-columns: minmax(0, 780px);
  justify-content: center;
}

.results-figures .figure-wide {
  grid-column: auto;
}

figure {
  margin: 0;
  padding: 16px;
}

figcaption {
  margin-top: 12px;
  font-size: 0.94rem;
}

.video-group {
  margin-top: 24px;
  padding: 16px;
}

.video-group[hidden] {
  display: none;
}

.video-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.video-tab {
  min-height: 34px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 6px 11px;
  color: var(--muted);
  background: transparent;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.84rem;
  font-weight: 650;
  cursor: pointer;
}

.video-tab:hover,
.video-tab:focus-visible,
.video-tab[aria-selected="true"] {
  border-color: var(--link);
  color: var(--text);
  background: var(--surface-alt);
  outline: 0;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.video-grid article {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface-alt);
}

video {
  aspect-ratio: 4 / 3;
  background: #111111;
  object-fit: cover;
}

.video-grid p {
  margin: 0;
  padding: 8px 10px;
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.88rem;
  font-weight: 650;
}

.citation {
  overflow-x: auto;
  padding: 18px;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 44px;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.9rem;
}

@media (max-width: 980px) {
  .video-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 840px) {
  .split,
  .video-heading,
  .method-grid,
  .result-grid,
  .results-figures {
    grid-template-columns: 1fr;
  }

  .results-figures .figure-wide {
    grid-column: auto;
  }
}

@media (max-width: 620px) {
  main,
  footer {
    width: min(100% - 24px, var(--max-width));
  }

  .video-grid {
    grid-template-columns: 1fr;
  }
}