:root {
  --ink: #1b2430;
  --muted: #5b6675;
  --line: #dfe4ea;
  --accent: #1f6f78;
  --bg: #fbfcfd;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
header {
  border-bottom: 1px solid var(--line);
  background: #fff;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-block: 16px; }
.brand { font-weight: 700; color: var(--ink); text-decoration: none; letter-spacing: 0.01em; }
nav { display: flex; gap: 20px; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--accent); }
main .wrap { padding-block: 40px 64px; }
h1 { font-size: 34px; line-height: 1.2; margin: 0 0 6px; text-wrap: balance; }
.updated { color: var(--muted); margin: 0 0 32px; font-size: 14px; }
h2 { font-size: 20px; margin: 36px 0 10px; }
p, li { max-width: 68ch; }
ul { padding-left: 22px; }
li { margin-bottom: 6px; }
a { color: var(--accent); }
.callout {
  border-left: 3px solid var(--accent);
  background: #eef6f7;
  padding: 12px 16px;
  margin: 16px 0;
}
footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer .wrap { padding-block: 20px; }