:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1c1d21;
  --muted: #5f6368;
  --line: #e3e4e8;
  --card: #f6f7f9;
  --accent: #2f6fed;
  --warn-bg: #fff4d6;
  --warn-fg: #6b4e00;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121316;
    --fg: #e8e9ec;
    --muted: #a0a4ab;
    --line: #2a2c31;
    --card: #1b1d21;
    --accent: #7aa4ff;
    --warn-bg: #3a2f10;
    --warn-fg: #f3d68a;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

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

header {
  border-bottom: 1px solid var(--line);
}

header nav,
main {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 16px;
}

header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  align-items: center;
  min-height: 56px;
}

header nav a {
  color: var(--fg);
  text-decoration: none;
}

header nav a[aria-current='page'] {
  color: var(--accent);
}

header nav .brand {
  font-weight: 600;
  margin-right: auto;
}

main {
  padding-top: 24px;
  padding-bottom: 64px;
}

.notice {
  background: var(--warn-bg);
  color: var(--warn-fg);
  border-radius: 8px;
  padding: 12px 16px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.cards a {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px;
  color: var(--fg);
  text-decoration: none;
}

.cards a strong {
  display: block;
  color: var(--accent);
  margin-bottom: 4px;
}

code {
  font-size: 0.9em;
  background: var(--card);
  border-radius: 4px;
  padding: 1px 4px;
  overflow-wrap: anywhere;
}

h2 {
  margin-top: 40px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}

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