:root {
  --color-bg: #f9fafb;
  --color-text: #1f2937;
  --color-muted: #6b7280;
  --color-brand: #059669;
  --color-link: #2563eb;
  --color-border: #e5e7eb;
  --color-card-bg: #ffffff;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  font-family: var(--font-stack);
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

header {
  background: #ffffff;
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 2rem;
}

nav {
  display: flex;
  gap: 2rem;
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
}

nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
}

nav a:hover { color: var(--color-brand); }

.brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-brand) !important;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

h1 { font-size: 2.5rem; margin: 0 0 0.5rem; }
h2 { font-size: 1.75rem; margin-top: 3rem; margin-bottom: 1rem; border-bottom: 2px solid var(--color-border); padding-bottom: 0.5rem; }
h3 { font-size: 1.25rem; margin: 0 0 0.5rem; color: var(--color-brand); }

.hero {
  text-align: center;
  padding: 3rem 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 2rem;
}

.hero .subtitle {
  font-size: 1.25rem;
  color: var(--color-muted);
  margin: 0.5rem 0 1.5rem;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin: 1.5rem 0;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  background: #e5e7eb;
  color: #374151;
}

.badge.ok { background: #d1fae5; color: #065f46; }

.endpoint {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1rem;
  margin: 0.75rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: monospace;
}

.endpoint code {
  font-family: monospace;
  font-size: 0.95rem;
  word-break: break-all;
}

.endpoint a {
  margin-left: 1rem;
  font-family: var(--font-stack);
  white-space: nowrap;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
}

.region-list, .topic-list {
  list-style: none;
  padding: 0;
}

.region-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}

.topic-list li {
  padding: 0.5rem 0;
  border-bottom: 1px dotted var(--color-border);
  font-family: monospace;
}

.topic-list .meta {
  background: #e5e7eb;
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  font-size: 0.75rem;
  margin-left: 0.5rem;
  font-family: var(--font-stack);
}

.std-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.std-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
}

.std-card.std-supplementary {
  background: #f3f4f6;
}

.llm-link {
  background: #1f2937;
  color: #ffffff;
  border-radius: 8px;
  padding: 2rem;
  margin: 2rem 0;
}

.llm-link a, .llm-link code {
  color: #f9fafb;
  background: #374151;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

code, pre {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Consolas, monospace;
  font-size: 0.9rem;
  background: #f3f4f6;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

pre {
  display: block;
  padding: 1rem;
  overflow-x: auto;
}

footer {
  margin-top: 4rem;
  padding: 2rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-muted);
  font-size: 0.9rem;
}

footer .cite {
  font-size: 0.85rem;
  margin-top: 1rem;
}