:root {
  color-scheme: dark;
  --page-background: #0f172a;
  --page-surface: #1e293b;
  --page-border: #334155;
  --page-text: #f8fafc;
  --page-muted: #94a3b8;
  --page-primary: #3b82f6;
  --page-radius: 0.75rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  min-width: 18rem;
  margin: 0;
  background: var(--page-background);
  color: var(--page-text);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a { color: inherit; }

:focus-visible {
  outline: 3px solid var(--page-primary);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 1rem;
  left: 1rem;
  padding: 0.75rem 1rem;
  border-radius: var(--page-radius);
  background: var(--page-text);
  color: var(--page-background);
  transform: translateY(-200%);
}

.skip-link:focus { transform: translateY(0); }

.site-container {
  width: min(100% - 2.5rem, 56rem);
  margin-inline: auto;
}

.institutional-header {
  border-bottom: 1px solid var(--page-border);
  background: var(--page-surface);
}

.institutional-header .site-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  min-height: 4.5rem;
}

.site-brand {
  color: var(--page-text);
  font-size: 1.125rem;
  font-weight: 700;
  text-decoration: none;
}

.institutional-nav,
.institutional-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

.institutional-nav a,
.institutional-footer a {
  color: var(--page-muted);
  font-size: 0.875rem;
  text-underline-offset: 0.2em;
}

.institutional-nav a:hover,
.institutional-nav a[aria-current="page"],
.institutional-footer a:hover {
  color: var(--page-text);
}

.institutional-main { padding: 3.5rem 0; }

.institutional-main h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.25rem);
  line-height: 1.1;
}

.page-intro {
  max-width: 46rem;
  margin: 1rem 0 2.5rem;
  color: var(--page-muted);
  font-size: 1.125rem;
}

.content-card {
  margin-top: 1.25rem;
  padding: clamp(1.25rem, 4vw, 2rem);
  border: 1px solid var(--page-border);
  border-radius: var(--page-radius);
  background: var(--page-surface);
}

.content-card h2:first-child { margin-top: 0; }

.content-card h2,
.content-card h3 { line-height: 1.25; }

.content-card a { color: #93c5fd; }

.content-card ul { padding-left: 1.25rem; }

.institutional-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--page-border);
  color: var(--page-muted);
}

.institutional-footer .site-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

@media (max-width: 40rem) {
  .institutional-header .site-container { align-items: flex-start; padding-block: 1rem; }
  .institutional-nav { justify-content: flex-end; }
}