:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface-2: #eef3fa;
  --text: #18212f;
  --muted: #5d6b82;
  --line: #d8e0ec;
  --accent: #0d5cab;
  --accent-dark: #084987;
  --shadow: 0 16px 40px rgba(18, 34, 61, 0.08);
  --radius: 18px;
  --container: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover { color: var(--accent-dark); }

.container {
  width: min(calc(100% - 2rem), var(--container));
  margin: 0 auto;
}

.hero {
  background: radial-gradient(circle at top left, rgba(29, 111, 196, 0.16), transparent 38%), linear-gradient(180deg, #ffffff 0%, #eef4fb 100%);
  border-bottom: 1px solid var(--line);
}

.hero-inner {
  padding: 5.5rem 0 4rem;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, 0.8fr);
  gap: 2rem;
  align-items: start;
}

.hero-main {
  min-width: 0;
}

.hero-toc {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.eyebrow,
.section-label,
.paper-tag {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
}

h1, h2, h3 {
  line-height: 1.15;
  margin: 0 0 0.75rem;
}

h1 {
  font-size: clamp(2.3rem, 4vw, 4rem);
  max-width: 14ch;
}

h2 {
  font-size: clamp(1.7rem, 2.5vw, 2.5rem);
}

h3 {
  font-size: 1.1rem;
}

.subtitle {
  font-size: 1.08rem;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 1rem;
}

.hero-text {
  max-width: 760px;
  font-size: 1.08rem;
  color: #243248;
}

.hero-actions {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin: 1.75rem 0 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.82rem 1.2rem;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--accent);
  color: white;
  box-shadow: var(--shadow);
}

.button-primary:hover { color: white; background: var(--accent-dark); }

.button-secondary {
  background: white;
  color: var(--text);
  border: 1px solid var(--line);
}

.award-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.award-meta div,
.team-item,
.card,
.paper-card,
.pub-toc {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.award-meta div {
  padding: 1rem 1.1rem;
  font-weight: 600;
}

.award-meta span {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.2rem;
}

.toc-inner {
  display: grid;
  gap: 0.7rem;
  padding-top: 0.25rem;
}

.toc-inner a {
  color: var(--muted);
  font-weight: 700;
  padding: 0.15rem 0;
  border-bottom: 2px solid transparent;
}

.toc-inner a.active,
.toc-inner a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.section {
  padding: 4.8rem 0;
}

.section.alt {
  background: linear-gradient(180deg, rgba(238, 243, 250, 0.7) 0%, rgba(247, 249, 252, 0.95) 100%);
}

.two-col {
  display: grid;
  grid-template-columns: minmax(220px, 0.9fr) minmax(0, 1.6fr);
  gap: 2rem;
  align-items: start;
}

.card-grid {
  display: grid;
  gap: 1.2rem;
}

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

.card,
.paper-card,
.team-item,
.pub-toc {
  padding: 1.35rem;
}

.section-intro {
  max-width: 760px;
  color: var(--muted);
}

.paper-meta {
  color: var(--muted);
  font-size: 0.97rem;
  margin-top: -0.15rem;
}

.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 0.2rem;
}

.paper-links a {
  font-weight: 700;
}

.paper-feature {
  display: grid;
  gap: 1.25rem;
}

.paper-feature-copy > :first-child {
  margin-top: 0;
}

.paper-points {
  margin: 0.5rem 0 1rem 1.15rem;
  padding: 0;
}

.paper-points li + li {
  margin-top: 0.45rem;
}

.paper-citation {
  color: var(--muted);
  font-size: 0.97rem;
}

.paper-figure {
  margin: 0;
}

.paper-figure img {
  display: block;
  width: 50%;
  max-width: 380px;
  margin: 0 auto;
  border-radius: 14px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.pub-layout {
  display: grid;
  grid-template-columns: minmax(240px, 0.75fr) minmax(0, 1.6fr);
  gap: 1.4rem;
  align-items: start;
  margin-top: 1.5rem;
}

.pub-toc {
  position: sticky;
  top: 4.8rem;
}

.pub-toc ol {
  padding-left: 1.15rem;
  margin-bottom: 0.5rem;
}

.pub-toc li + li { margin-top: 0.55rem; }
.toc-note { color: var(--muted); font-size: 0.94rem; }

.pub-content {
  display: grid;
  gap: 1rem;
}

.pub-group-heading {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--accent-dark);
  padding-top: 0.25rem;
}

.team-list {
  display: grid;
  gap: 1rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #fff;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0 2rem;
  color: var(--muted);
  font-size: 0.96rem;
}

code {
  background: #eef3fa;
  padding: 0.15rem 0.4rem;
  border-radius: 8px;
  border: 1px solid var(--line);
}

@media (max-width: 900px) {
  .hero-layout,
  .two-col,
  .pub-layout,
  .three-up {
    grid-template-columns: 1fr;
  }

  .pub-toc {
    position: static;
  }

  .hero-inner {
    padding-top: 4.2rem;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 3.8rem 0;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .button {
    width: 100%;
  }
}