:root {
  --bg: #ffffff;
  --ink: #111827;
  --muted: #5b6472;
  --line: #e5e7eb;
  --soft: #f6f8fb;
  --accent: #1f4e79;
  --accent-dark: #163c5f;
  --card: #ffffff;
  --shadow: 0 16px 40px rgba(17, 24, 39, 0.08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Arial, sans-serif;
  line-height: 1.65;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px clamp(18px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.brand {
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.02em;
  font-size: 1.08rem;
}

nav {
  display: flex;
  gap: 22px;
  align-items: center;
}

nav a {
  color: var(--ink);
  font-weight: 600;
  font-size: 0.94rem;
}

.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  font-size: 1.5rem;
}

.hero {
  display: grid;
  grid-template-columns: 1.35fr 0.85fr;
  gap: 48px;
  align-items: center;
  padding: 90px clamp(18px, 5vw, 72px) 70px;
  max-width: 1240px;
  margin: auto;
}

.eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  font-weight: 800;
  letter-spacing: 0.11em;
  font-size: 0.76rem;
  margin-bottom: 10px;
}

h1, h2, h3 {
  line-height: 1.15;
  letter-spacing: -0.035em;
  margin: 0 0 16px;
}

h1 {
  font-size: clamp(2.6rem, 7vw, 5.2rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

h3 {
  font-size: 1.25rem;
}

.lead {
  font-size: clamp(1.12rem, 2vw, 1.35rem);
  color: #263241;
  max-width: 790px;
}

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

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  padding: 11px 18px;
  border-radius: 999px;
  color: var(--ink);
  background: #fff;
  font-weight: 700;
  box-shadow: 0 8px 20px rgba(17, 24, 39, 0.04);
}

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

.button.primary:hover {
  background: var(--accent-dark);
  text-decoration: none;
}

.hero-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.hero-card img {
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
  border-radius: 20px;
  background: var(--soft);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 16px;
}

.stat-grid div {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px;
  background: var(--soft);
}

.stat-grid strong { display: block; }
.stat-grid span { color: var(--muted); font-size: 0.9rem; }

.section {
  max-width: 1240px;
  margin: auto;
  padding: 72px clamp(18px, 5vw, 72px);
}

.section.alt {
  max-width: none;
  background: var(--soft);
  padding-left: clamp(18px, 5vw, 72px);
  padding-right: clamp(18px, 5vw, 72px);
}

.section.alt > * {
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

.intro {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.intro p {
  font-size: 1.15rem;
  color: #263241;
  max-width: 950px;
}

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

.cards {
  display: grid;
  gap: 18px;
}

.cards.four {
  grid-template-columns: repeat(4, 1fr);
}

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

.card, .project, .contact-card, .publication-note {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 10px 28px rgba(17, 24, 39, 0.05);
}

.card p, .project p {
  color: var(--muted);
  margin-bottom: 0;
}

.project-list {
  display: grid;
  gap: 18px;
}

.project {
  border-left: 5px solid var(--accent);
}

.tag {
  display: inline-flex;
  padding: 5px 10px;
  border-radius: 999px;
  background: #e8f1fa;
  color: var(--accent-dark);
  font-weight: 800;
  font-size: 0.78rem;
  margin-bottom: 12px;
}

.publication-note {
  margin-bottom: 24px;
}

.pub-list {
  padding-left: 24px;
  margin-bottom: 28px;
}

.pub-list li {
  margin-bottom: 14px;
}

.pub-list span {
  display: block;
  color: var(--muted);
}

.timeline {
  display: grid;
  gap: 14px;
}

.timeline div {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
}

.timeline span {
  color: var(--accent);
  font-weight: 900;
}

.timeline p {
  margin: 0;
  color: var(--muted);
}

.contact {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 34px;
  align-items: start;
}

.socials {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.socials a {
  padding: 8px 12px;
  background: var(--soft);
  border-radius: 999px;
  font-weight: 700;
}

footer {
  padding: 28px clamp(18px, 5vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}

@media (max-width: 920px) {
  .hero, .contact {
    grid-template-columns: 1fr;
  }

  .cards.four, .cards.three {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 680px) {
  .nav-toggle {
    display: block;
  }

  nav {
    display: none;
    position: absolute;
    left: 18px;
    right: 18px;
    top: 62px;
    flex-direction: column;
    align-items: flex-start;
    background: white;
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 18px;
    box-shadow: var(--shadow);
  }

  nav.open {
    display: flex;
  }

  .hero {
    padding-top: 52px;
  }

  .cards.four, .cards.three {
    grid-template-columns: 1fr;
  }

  .timeline div {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}