:root {
  --bg: #ffffff;
  --soft: #f3f5f8;
  --ink: #17202c;
  --muted: #5b6677;
  --line: #d8dee6;
  --accent: #2b54e0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1218;
    --soft: #161d26;
    --ink: #e5eaf0;
    --muted: #98a4b4;
    --line: #2a3441;
    --accent: #7f9cff;
  }
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font:
    16px/1.75 -apple-system,
    BlinkMacSystemFont,
    "PingFang SC",
    "Helvetica Neue",
    sans-serif;
  -webkit-text-size-adjust: 100%;
}
header,
main,
footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px;
}
header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 20px;
  padding-top: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
header strong {
  font-size: 18px;
  margin-right: auto;
}
a {
  color: var(--accent);
}
nav a {
  margin-left: 16px;
  text-decoration: none;
}
nav a:first-child {
  margin-left: 0;
}
nav a[aria-current] {
  color: var(--ink);
  font-weight: 600;
}
main {
  padding-top: 36px;
}
h1 {
  font-size: 28px;
  line-height: 1.3;
  margin: 0 0 4px;
}
h2 {
  font-size: 20px;
  margin: 40px 0 10px;
}
p,
ul {
  margin: 8px 0;
}
ul {
  padding-left: 22px;
}
.meta {
  color: var(--muted);
  font-size: 14px;
}
section + section {
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
}
footer {
  margin-top: 48px;
  padding: 20px 16px 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}
@media (max-width: 480px) {
  h1 {
    font-size: 24px;
  }
}