* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", Arial, sans-serif;
  color: #172033;
  background: #f5f7fb;
  line-height: 1.6;
}

a {
  color: #2463eb;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

.container {
  width: min(900px, calc(100% - 128px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(245, 247, 251, 0.9);
  border-bottom: 1px solid rgba(23, 32, 51, 0.08);
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 20px;
}

.brand {
  font-size: 1.15rem;
  font-weight: 800;
  color: #101726;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-links a {
  color: #31405f;
  font-weight: 600;
}

.nav-toggle {
  display: none;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 5px auto;
  background: #101726;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.hero {
  padding: 88px 0 56px;
  background:
    radial-gradient(circle at top, rgba(36, 99, 235, 0.16), transparent 35%),
    linear-gradient(180deg, #ffffff 0%, #eef3ff 100%);
}

.eyebrow,
.section-kicker {
  margin: 0 0 10px;
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #2463eb;
}

.hero h1,
.section-heading h2 {
  margin: 0;
  line-height: 1.12;
  color: #101726;
}

.hero h1 {
  max-width: 980px;
  font-size: clamp(1.8rem, 4vw, 3.1rem);
}

.hero-title-accent {
  background: linear-gradient(90deg, #2463eb 0%, #7c3aed 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-copy {
  max-width: 840px;
  margin: 24px 0 0;
  font-size: 1.1rem;
  color: #31405f;
}

.authors,
.affiliations,
.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
}

.authors {
  margin-top: 28px;
  font-size: 1rem;
  font-weight: 600;
  color: #101726;
}

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

.authors a:hover {
  color: #2463eb;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.affiliations {
  margin-top: 16px;
  color: #53627f;
}

.author-notes {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 20px;
  margin: 10px 0 0;
  color: #53627f;
  font-style: italic;
}

.author-notes span {
  white-space: nowrap;
}

.link-row {
  margin-top: 28px;
}

.pill-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid rgba(23, 32, 51, 0.12);
  background: #ffffff;
  color: #101726;
  font-weight: 700;
  box-shadow: 0 10px 24px rgba(16, 23, 38, 0.08);
}

.pill-link:hover {
  text-decoration: none;
  transform: translateY(-1px);
  background: #f8faff;
}

.pill-link i {
  font-size: 1rem;
  line-height: 1;
}

.section {
  padding: 72px 0;
}

.muted-section {
  background: #eef3fb;
}

.dark-section {
  background:
    radial-gradient(circle at top, rgba(70, 113, 255, 0.15), transparent 30%),
    #0f1728;
}

.light-text,
.light-text h2,
.light-text p {
  color: #f5f8ff;
}

.centered {
  text-align: center;
}

.section-heading {
  margin-bottom: 28px;
}

.section-heading p {
  max-width: 800px;
  margin-top: 12px;
  color: #53627f;
}

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.text-card,
.info-card,
.highlight-card,
.stat-card,
.video-card,
.pdf-figure,
.citation-block {
  border: 1px solid rgba(23, 32, 51, 0.08);
  background: #ffffff;
  border-radius: 22px;
  box-shadow: 0 18px 40px rgba(16, 23, 38, 0.06);
}

.text-card {
  padding: 24px;
}

.text-card p:first-child {
  margin-top: 0;
}

.text-card p:last-child {
  margin-bottom: 0;
}

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

.stat-card {
  padding: 18px;
}

.stat-card strong {
  display: block;
  font-size: 1.8rem;
  color: #164dca;
}

.stat-card span {
  display: block;
  margin-top: 6px;
  color: #53627f;
}

.card-grid,
.highlight-grid,
.figure-grid,
.video-grid {
  display: grid;
  gap: 24px;
}

.three-up {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.highlight-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 24px;
}

.figure-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: 24px;
}

.info-card,
.highlight-card {
  padding: 24px;
}

.info-card h3,
.highlight-card h3 {
  margin-top: 0;
  margin-bottom: 10px;
  color: #101726;
}

.info-card p,
.highlight-card p {
  margin: 0;
  color: #53627f;
}

.pdf-figure {
  margin: 0;
  padding: 18px;
}

.pdf-object {
  width: 100%;
  min-height: 620px;
  border: 0;
  border-radius: 14px;
  background: linear-gradient(180deg, #f9fbff 0%, #eef3fb 100%);
}

.pdf-figure img {
  display: block;
  width: 100%;
  border-radius: 14px;
  background: linear-gradient(180deg, #f9fbff 0%, #eef3fb 100%);
}

.pdf-figure.compact .pdf-object {
  min-height: 420px;
}

.pdf-figure figcaption {
  margin-top: 14px;
  color: #53627f;
}

.video-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.dark-section .section-heading {
  text-align: left;
}

.video-card {
  margin: 0;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.06);
}

.video-card video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
}

.video-card figcaption {
  padding: 14px 16px 18px;
  color: #e6ecff;
  font-weight: 600;
}

.teaser-video-card {
  max-width: 1080px;
  margin: 0 auto;
}

.citation-block {
  margin: 0;
  padding: 22px;
  overflow-x: auto;
  background: #0f1728;
  color: #dbe5ff;
}

.site-footer {
  padding: 28px 0 48px;
}

.footer-shell {
  color: #53627f;
  text-align: center;
}

.footer-shell p {
  margin: 6px 0;
}

@media (max-width: 960px) {
  .two-column,
  .three-up,
  .highlight-grid,
  .figure-grid,
  .video-grid {
    grid-template-columns: 1fr;
  }

  .pdf-object,
  .pdf-figure.compact .pdf-object {
    min-height: 420px;
  }
}

@media (max-width: 760px) {
  .site-header {
    backdrop-filter: none;
    background: rgba(245, 247, 251, 0.98);
  }

  .nav-toggle {
    display: inline-block;
  }

  .nav-links {
    position: absolute;
    top: calc(100% - 6px);
    right: 16px;
    left: 16px;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    padding: 16px;
    border: 1px solid rgba(23, 32, 51, 0.08);
    border-radius: 18px;
    background: #ffffff;
    box-shadow: 0 18px 40px rgba(16, 23, 38, 0.12);
  }

  .nav-links.is-open {
    display: flex;
  }

  .hero {
    padding-top: 72px;
  }

  .section {
    padding: 56px 0;
  }

  .container {
    width: min(960px, calc(100% - 48px));
  }

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

  .pdf-object,
  .pdf-figure.compact .pdf-object {
    min-height: 300px;
  }
}