:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #555;
  --accent: #1a5276;
  --border: #e0e0e0;
  --card-bg: #f7f9fa;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12181c;
    --fg: #e8e8e8;
    --muted: #a9b2b8;
    --accent: #6fb1e0;
    --border: #2a343a;
    --card-bg: #1a2227;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}
a { color: var(--accent); }

/* site header / nav, shared by every page */
header.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 1rem;
}
header.site-header .brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--fg);
  font-weight: 700;
  font-size: 1.25rem;
}
header.site-header .brand img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 6px;
  background: #fff;
  padding: 3px;
}
nav.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
}
nav.site-nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.95rem;
}
nav.site-nav a:hover,
nav.site-nav a.active {
  color: var(--accent);
}

main.page {
  max-width: 900px;
  margin: 0 auto;
  padding: 0.5rem 1.5rem 3rem;
}
main.page h1 {
  margin-top: 0.5rem;
}
main.page h2 {
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.4rem;
  margin-top: 2.5rem;
}
main.page img {
  max-width: 100%;
}
main.page table {
  border-collapse: collapse;
  width: 100%;
  overflow-x: auto;
  display: block;
}
main.page th, main.page td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.6rem;
  text-align: left;
}
main.page pre {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
}
main.page code {
  background: var(--card-bg);
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
}
main.page pre code {
  background: none;
  padding: 0;
}
main.page blockquote {
  border-left: 3px solid var(--accent);
  margin-left: 0;
  padding-left: 1rem;
  color: var(--muted);
}

/* homepage-only styling */
.hero {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.hero img {
  width: 96px;
  height: 96px;
  object-fit: contain;
  border-radius: 8px;
  background: #fff;
  padding: 6px;
  flex-shrink: 0;
}
ul.consortium, ul.citations {
  padding-left: 1.2rem;
}
.citations li {
  margin-bottom: 0.6rem;
  color: var(--muted);
}
nav.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}
nav.content-grid a {
  display: block;
  padding: 0.9rem 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  color: var(--fg);
}
nav.content-grid a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

footer.site-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 2rem 1.5rem;
}