:root {
  --bg: #f5f8fb;
  --bg-alt: #ffffff;
  --accent: #0087b6;
  --accent-dark: #00527b;
  --text: #193047;
  --muted: #556779;
  --card-border: #dde4ee;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* Layout helpers */

.container {
  width: min(1120px, 100% - 2.5rem);
  margin: 0 auto;
}

.section {
  padding: 4rem 0;
}

.section-alt {
  padding: 4rem 0;
  background: var(--bg-alt);
}

.section h2 {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.section-intro {
  max-width: 720px;
  color: var(--muted);
}

/* Header & nav */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(245, 248, 251, 0.98);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e0e6f0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo {
  width: 52px;
  height: 52px;
}

.brand-title {
  font-weight: 700;
  font-size: 1.1rem;
}

.brand-subtitle {
  font-size: 0.8rem;
  color: var(--muted);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.9rem;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  transition: background 0.15s ease, color 0.15s ease;
}

.nav a:hover {
  background: var(--accent);
  color: #ffffff;
}

/* Hero */

.hero {
  padding: 4rem 0 3rem;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1.4fr);
  gap: 2.5rem;
  align-items: center;
}

.hero h1 {
  font-size: clamp(2rem, 3vw + 1rem, 2.8rem);
  margin-bottom: 0.75rem;
}

.hero-tagline {
  color: var(--muted);
  max-width: 640px;
}

.hero-buttons {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1.3rem;
  border-radius: 999px;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #ffffff;
}

.btn.secondary {
  border: 1px solid var(--accent);
  color: var(--accent-dark);
  background: #ffffff;
}

.hero-highlight {
  background: var(--bg-alt);
  padding: 1.75rem 1.5rem;
  border-radius: 1rem;
  border: 1px solid var(--card-border);
  box-shadow: 0 10px 25px rgba(0, 40, 80, 0.07);
}

.hero-highlight h2 {
  font-size: 1.1rem;
  margin-top: 0;
}

.hero-highlight ul {
  padding-left: 1.1rem;
  margin: 0.75rem 0 0;
  color: var(--muted);
}

/* Grids & cards */

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: #ffffff;
  border-radius: 1rem;
  border: 1px solid var(--card-border);
  padding: 1.5rem;
  box-shadow: 0 10px 25px rgba(0, 40, 80, 0.04);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

/* People */

.people-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1.7fr);
  gap: 2rem;
  margin-top: 1.5rem;
}

.person .role {
  font-weight: 600;
  color: var(--accent-dark);
}

.person .bio {
  color: var(--muted);
}

.person-group h3 {
  margin-bottom: 0.25rem;
  margin-top: 1rem;
}

/* Publications, news, lists */

.pub-list,
.news-list,
.link-list {
  list-style: none;
  padding-left: 0;
  margin-top: 1.5rem;
}

.pub-list li + li,
.news-list li + li {
  margin-top: 0.75rem;
}

.pub-list a {
  color: var(--accent-dark);
}

.news-date {
  font-weight: 600;
  margin-right: 0.4rem;
}

.news-text {
  color: var(--muted);
}

/* Links */

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

a:hover {
  text-decoration: underline;
}

/* Footer */

.site-footer {
  padding: 1.5rem 0 2rem;
  border-top: 1px solid #d9e1ee;
  background: #f3f6fb;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}

/* Responsive */

@media (max-width: 840px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav {
    justify-content: flex-start;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-highlight {
    order: -1;
  }

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

@media (max-width: 520px) {
  .nav {
    gap: 0.4rem;
    font-size: 0.8rem;
  }

  .header-inner {
    padding: 0.5rem 0;
  }

  .section {
    padding: 3rem 0;
  }

  .section-alt {
    padding: 3rem 0;
  }
}