:root {
  color-scheme: light dark;
  --ground: #f2f2f7;
  --ink: #1c1c1e;
  --muted: #6b6b70;
  --accent: #2f6fd0;
  --hairline: #d1d1d6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #1c1c1e;
    --ink: #f2f2f7;
    --muted: #a1a1a6;
    --accent: #97c6ff;
    --hairline: #3a3a3c;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0 auto;
  max-width: 40rem;
  padding: 0 1.25rem 3rem;
  background: var(--ground);
  color: var(--ink);
  font: 1.0625rem/1.6 -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "PingFang TC", sans-serif;
  -webkit-text-size-adjust: 100%;
}

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

header nav,
.languages {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}

header nav {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--hairline);
}

header nav a {
  text-decoration: none;
}

header nav a:first-child,
header nav a[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
}

h1 {
  margin: 2.5rem 0 0.5rem;
  font-size: 2rem;
  line-height: 1.2;
}

h2 {
  margin: 2rem 0 0.25rem;
  font-size: 1.125rem;
}

p {
  margin: 0.5rem 0;
}

.lead {
  font-size: 1.25rem;
}

.date,
footer {
  color: var(--muted);
  font-size: 0.9375rem;
}

footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--hairline);
}