:root {
  color-scheme: light dark;
  --text: #1b1f24;
  --muted: #4a5360;
  --background: #ffffff;
  --rule: #d5dae1;
  --link: #0b4f8a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e8ebef;
    --muted: #b3bbc6;
    --background: #14181d;
    --rule: #333b45;
    --link: #8ec0f0;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family:
    system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    sans-serif;
  font-size: 1.0625rem;
  line-height: 1.6;
}

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

a:focus-visible {
  outline: 3px solid var(--link);
  outline-offset: 2px;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  padding: 0.5rem 1rem;
  background: var(--background);
}

.skip:focus {
  left: 0;
}

header,
main,
footer {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
}

.brand {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
}

nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

h1 {
  margin: 2.5rem 0 1rem;
  font-size: 1.875rem;
  line-height: 1.25;
}

h2 {
  margin: 0 0 0.75rem;
  font-size: 1.375rem;
  line-height: 1.3;
}

h3 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.0625rem;
}

section {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

.lead {
  font-size: 1.1875rem;
}

address {
  font-style: normal;
}

dl {
  margin: 1rem 0;
}

dt {
  margin-top: 0.75rem;
  font-weight: 600;
}

dd {
  margin: 0;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  padding-bottom: 2rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9375rem;
}

footer p {
  margin: 0;
}

@media print {
  nav,
  .skip {
    display: none;
  }
}