:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface-soft: #eef3f8;
  --ink: #18212f;
  --muted: #5f6d7f;
  --accent: #0b5b84;
  --accent-strong: #083d5a;
  --border: #d8e1ea;
  --shadow: 0 20px 50px rgba(12, 39, 63, 0.12);
  --radius: 22px;
  --max: 1160px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); text-decoration: underline; }
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: .75rem 1rem;
  z-index: 10;
}
.skip-link:focus { left: 0; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(12px);
  background: rgba(247, 249, 252, 0.88);
  border-bottom: 1px solid var(--border);
}
.topbar {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  color: var(--ink);
  font-weight: 700;
  letter-spacing: .01em;
}
.nav-links { display: flex; flex-wrap: wrap; gap: .45rem .9rem; align-items: center; }
.nav-links a { color: var(--muted); font-size: .95rem; }
.nav-links a:hover { color: var(--accent); }
.menu-toggle { display: none; }
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 4.5rem 1.25rem;
}
.hero {
  min-height: 78vh;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr);
  gap: 3rem;
  align-items: center;
}
.eyebrow, .section-kicker {
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  font-size: .78rem;
  margin: 0 0 .8rem;
}
h1, h2, h3 { line-height: 1.15; margin: 0; }
h1 { font-size: clamp(2.5rem, 6vw, 5.2rem); letter-spacing: -.04em; }
h2 { font-size: clamp(1.85rem, 3vw, 3rem); letter-spacing: -.03em; }
h3 { font-size: 1.1rem; margin-bottom: .5rem; }
p { margin: 0 0 1rem; }
.lead { font-size: clamp(1.08rem, 2vw, 1.35rem); color: var(--muted); max-width: 790px; margin-top: 1.2rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .78rem 1.05rem;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  border: 1px solid var(--accent);
}
.button:hover { color: #fff; background: var(--accent-strong); text-decoration: none; }
.button.secondary { background: #fff; color: var(--accent); }
.button.secondary:hover { color: var(--accent-strong); background: var(--surface-soft); }
.profile-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: var(--shadow);
}
.profile-card img { width: 100%; height: auto; border-radius: 18px; display: block; margin-bottom: 1.2rem; }
.profile-card h2 { font-size: 1.35rem; margin-bottom: .5rem; }
.profile-card p { color: var(--muted); margin-bottom: .5rem; }
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  padding-top: 0;
}
.stat-card, .info-card, .compact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 30px rgba(12, 39, 63, 0.07);
}
.stat-card { padding: 1.2rem; }
.stat-card strong { display: block; font-size: 2rem; line-height: 1; color: var(--accent); }
.stat-card span { display: block; margin-top: .5rem; color: var(--muted); font-size: .95rem; }
.two-column {
  display: grid;
  grid-template-columns: minmax(250px, .75fr) minmax(0, 1.25fr);
  gap: 3rem;
  align-items: start;
}
.card-grid-section h2, .timeline-section h2, .publications-section h2 { margin-bottom: 1.8rem; }
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.card-grid.three { grid-template-columns: repeat(3, 1fr); }
.info-card, .compact-card { padding: 1.25rem; }
.info-card p, .compact-card p { color: var(--muted); }
.stack { display: grid; gap: 1rem; }
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}
.timeline li {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.25rem 1.25rem 1.5rem;
}
.timeline span {
  display: inline-block;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: .35rem;
}
.timeline strong { display: block; font-size: 1.05rem; }
.timeline p { color: var(--muted); margin: .45rem 0 0; }
.publication-list { padding-left: 1.25rem; }
.publication { margin-bottom: .85rem; }
.selected .publication { padding-left: .2rem; }
details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-top: 1rem;
}
summary { cursor: pointer; font-weight: 700; color: var(--accent); }
.full-list { max-height: 540px; overflow: auto; padding-right: .75rem; }
.contact-section {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 2rem;
  align-items: start;
}
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .75rem; }
.contact-grid a {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: .9rem 1rem;
}
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.25rem;
  text-align: center;
  color: var(--muted);
}
@media (max-width: 900px) {
  .hero, .two-column, .contact-section { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .card-grid, .card-grid.three { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .menu-toggle {
    display: inline-flex;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: #fff;
    padding: .55rem .85rem;
    font-weight: 700;
  }
  .nav-links {
    display: none;
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: 4rem;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 1rem;
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: grid; grid-template-columns: repeat(2, 1fr); }
  .section { padding: 3rem 1rem; }
  .hero { padding-top: 3.5rem; }
  .stats, .card-grid, .card-grid.three, .contact-grid { grid-template-columns: 1fr; }
}