:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #111111;
  --muted: #555555;
  --card: #f5f5f5;
  --border: #d0d0d0;
  --link: #0645ad;
  --focus: #ffbf47;
  --maxw: 48rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111111;
    --fg: #f5f5f5;
    --muted: #c7c7c7;
    --card: #1b1b1b;
    --border: #3a3a3a;
    --link: #8ab4f8;
    --focus: #ffd166;
  }
}

* { box-sizing: border-box; }

html {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.5;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
}

a {
  color: var(--link);
  text-underline-offset: 0.15em;
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 0.2rem;
}

.skip-link {
  position: absolute;
  left: 0.75rem;
  top: -3rem;
  background: var(--bg);
  color: var(--fg);
  border: 2px solid var(--fg);
  padding: 0.5rem 0.75rem;
  z-index: 1000;
}

.skip-link:focus {
  top: 0.75rem;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1rem;
}

header {
  padding-block: 1rem 0.5rem;
}

nav a + a {
  margin-left: 1rem;
}

main {
  display: block;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.25rem;
}

.back-link {
  margin: 0 0 1rem;
}

.hidden {
  display: none;
}

h1 {
  margin: 0 0 1rem;
  font-size: 2rem;
  line-height: 1.2;
}

h2 {
  margin: 1.5rem 0 0.75rem;
  font-size: 1.25rem;
}

h2:first-of-type {
  margin-top: 0;
}

p {
  margin: 0 0 1rem;
}

address {
  font-style: normal;
  white-space: pre-line;
  margin: 0;
}

dl {
  margin: 1.25rem 0 0;
}

dt {
  font-weight: 700;
  margin-top: 0.75rem;
}

dd {
  margin: 0.25rem 0 0;
}

ul {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
}