:root {
  color-scheme: light dark;
  --bg: #f1f4f3;
  --surface: #ffffff;
  --text: #182321;
  --muted: #5f6d69;
  --line: #d7dfdc;
  --accent: #376c64;
  --accent-soft: #e2efeb;
  --warning-bg: #f7eee0;
  --warning-text: #684d28;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121918;
    --surface: #1b2523;
    --text: #edf3f1;
    --muted: #aab8b4;
    --line: #34423f;
    --accent: #8fc2b8;
    --accent-soft: #243b37;
    --warning-bg: #3e3323;
    --warning-text: #f0d7ad;
  }
}

* {
  box-sizing: border-box;
}

html {
  font-size: 100%;
  line-height: 1.7;
}

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

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
}

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  padding: 0.6rem 0.8rem;
  background: var(--surface);
  z-index: 10;
}

.skip-link:focus {
  top: 1rem;
}

header,
main,
footer {
  width: min(100% - 2rem, 760px);
  margin-inline: auto;
}

header {
  padding-block: 1.5rem 1rem;
}

.brand {
  color: var(--text);
  font-size: 1.15rem;
  font-weight: 750;
  text-decoration: none;
}

nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

main {
  padding-bottom: 3rem;
}

h1,
h2,
h3 {
  line-height: 1.3;
  overflow-wrap: anywhere;
}

h1 {
  margin-top: 1.4rem;
  font-size: clamp(1.8rem, 7vw, 2.5rem);
}

h2 {
  margin-top: 2.4rem;
  font-size: 1.35rem;
}

p,
li {
  overflow-wrap: anywhere;
}

.lead {
  color: var(--muted);
  font-size: 1.08rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 210px), 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.card,
.notice {
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--surface);
  padding: 1.1rem 1.2rem;
}

.card h2,
.card h3 {
  margin-top: 0;
}

.card p:last-child,
.notice p:last-child {
  margin-bottom: 0;
}

.notice {
  margin-block: 1.5rem;
  background: var(--accent-soft);
}

.notice.warning {
  color: var(--warning-text);
  background: var(--warning-bg);
}

code {
  overflow-wrap: anywhere;
}

footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding-block: 1.2rem 2rem;
  font-size: 0.9rem;
}

@media (max-width: 380px) {
  header,
  main,
  footer {
    width: min(100% - 1.25rem, 760px);
  }

  nav ul {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
}