:root {
  --bg: #ffffff;
  --panel: #ffffff;
  --panel-strong: #ffffff;
  --line: #e4e4e4;
  --line-strong: #cfcfcf;
  --text: #121212;
  --muted: #555555;
  --accent: #1a5fb4;
  --shadow: none;
  --radius-lg: 8px;
  --radius-md: 8px;
  --content-width: 1100px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--bg);
}

img,
video {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

.page-shell {
  width: min(calc(100% - 40px), var(--content-width));
  margin: 0 auto;
  padding: 18px 0 72px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 10px 0 18px;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.topnav {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-size: 0.96rem;
}

.topnav a:hover,
.resource-link:hover {
  color: var(--accent);
}

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0;
  padding: 40px 0 12px;
}

.hero-figure {
  padding-top: 18px;
}

.hero h1,
.section-heading h2 {
  margin: 0;
  font-family: "Times New Roman", Times, serif;
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.15;
}

.hero h1 {
  max-width: 1080px;
  font-size: clamp(2.1rem, 4vw, 3.3rem);
}

.author-block {
  margin-top: 18px;
}

.authors,
.affiliations,
.contrib {
  margin: 6px 0 0;
  color: var(--text);
  font-size: 1rem;
  line-height: 1.5;
}

.contrib {
  color: var(--muted);
  font-size: 0.95rem;
}

.link-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 22px;
  margin-top: 22px;
}

.link-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #1a5fb4;
  font-size: 1.02rem;
}

.link-action:hover {
  text-decoration: underline;
}

.link-icon {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.metric-card {
  padding: 16px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fafafa;
  text-align: center;
}

.metric-value {
  display: block;
  font-family: "Times New Roman", Times, serif;
  font-size: 1.8rem;
  font-weight: 700;
}

.metric-label {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  line-height: 1.45;
}

.section {
  padding-top: 56px;
}

.section-heading {
  max-width: 960px;
  margin: 0 auto 18px;
  text-align: center;
}

.section-heading h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin-bottom: 8px;
}

.section-heading p:last-child,
.prose p {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.7;
}

.prose {
  max-width: 960px;
  margin: 0 auto;
  text-align: left;
}

.feature-grid,
.results-stack {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 18px;
}

.feature-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fafafa;
  text-align: left;
}

.feature-card h3 {
  margin: 0 0 10px;
  font-size: 1.08rem;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.media-frame {
  max-width: 960px;
  margin: 0 auto;
  padding: 0;
}

.media-frame figcaption {
  padding: 10px 8px 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.55;
  text-align: left;
}

.plain-frame img,
.plain-frame video,
.narrow-frame img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
}

.wide-frame {
  max-width: none;
}

.results-split {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
  gap: 20px;
  align-items: start;
  max-width: 1080px;
  margin: 0 auto;
}

.equal-height-frame {
  display: flex;
  flex-direction: column;
}

.equal-height-media {
  height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.equal-height-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.video-frame {
  max-width: 920px;
  margin: 0 auto;
  padding: 0;
}

.video-frame video {
  width: 100%;
  background: #0e1214;
  border: 1px solid var(--line);
}

.resource-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 18px;
}

.resource-link {
  color: var(--muted);
  font-weight: 600;
}

.citation-wrap {
  max-width: 960px;
  margin: 0 auto;
}

.citation-section .section-heading p {
  text-align: left;
}

.citation-block {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: #fafafa;
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.6;
  text-align: left;
}

@media (max-width: 980px) {
  .hero,
  .summary-grid,
  .feature-grid,
  .results-split {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 36px;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(calc(100% - 24px), var(--content-width));
    padding-top: 14px;
  }

  .topbar {
    flex-direction: column;
    align-items: center;
  }

  .topnav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
  }

  .hero h1 {
    font-size: clamp(1.8rem, 8vw, 2.5rem);
  }

  .section {
    padding-top: 44px;
  }
}