:root {
  color-scheme: light dark;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
  --background: #f7f8f4;
  --surface: #ffffff;
  --text: #20231f;
  --muted: #5e645c;
  --border: #d9ddd5;
  --accent: #167547;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #151713;
    --surface: #1d201b;
    --text: #f2f4ef;
    --muted: #b5bcb0;
    --border: #3b4038;
    --accent: #6bd49a;
  }
}

* {
  box-sizing: border-box;
}

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

header,
main,
footer {
  width: min(100% - 2rem, 48rem);
  margin-inline: auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.25rem;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

main {
  padding-block: 2.5rem 4rem;
}

.card {
  padding: clamp(1.25rem, 4vw, 2.5rem);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1rem;
}

h1 {
  margin-top: 0;
  font-size: clamp(2rem, 8vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

h2 {
  margin-top: 2rem;
  line-height: 1.2;
}

p,
li {
  max-width: 68ch;
}

.lede {
  color: var(--muted);
  font-size: 1.15rem;
}

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

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

footer {
  padding-block: 1.5rem 2.5rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

code {
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
}

@media (max-width: 34rem) {
  header {
    align-items: flex-start;
    flex-direction: column;
  }
}