:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5c5c5c;
  --accent: #3b5bdb;
  --border: #e5e5e5;
  --card-bg: #f7f7f8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --fg: #e8e8e8;
    --muted: #a3a3a3;
    --accent: #7c93f0;
    --border: #2a2a2a;
    --card-bg: #1b1b1d;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.7;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--fg);
}

nav.site-nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 20px;
  font-size: 0.95rem;
}

nav.site-nav a:hover,
nav.site-nav a:first-child {
  color: var(--accent);
}

h1 {
  font-size: 1.9rem;
  margin-bottom: 0.3em;
}

h2 {
  font-size: 1.25rem;
  margin-top: 2em;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.3em;
}

p, li {
  color: var(--fg);
}

.effective-date {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 2em;
}

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

.card {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 16px;
  text-decoration: none;
  color: var(--fg);
  transition: border-color 0.15s ease;
}

.card:hover {
  border-color: var(--accent);
}

.card h3 {
  margin: 0 0 4px;
  color: var(--accent);
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

footer.site-footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}

footer.site-footer a {
  color: var(--muted);
}