:root {
  --ink: #14181f;
  --muted: #5b6472;
  --line: #e2e6ec;
  --bg: #fbfcfd;
  --accent: #1f6feb;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 24px 96px;
}

header.site {
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
  padding-bottom: 20px;
}

header.site a.brand {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}

nav.top {
  margin-top: 12px;
  font-size: 14px;
  color: var(--muted);
}

nav.top a {
  color: var(--muted);
  margin-right: 16px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

nav.top a:hover { border-bottom-color: var(--muted); }

h1 {
  font-size: 32px;
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin: 0 0 12px;
}

p.lede {
  color: var(--muted);
  font-size: 18px;
  margin: 0 0 36px;
}

h2 {
  font-size: 21px;
  margin: 40px 0 10px;
  letter-spacing: -0.01em;
}

p { margin: 0 0 16px; }

ul { margin: 0 0 18px; padding-left: 22px; }

li { margin-bottom: 8px; }

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

code {
  font: 0.9em/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
  background: #eef1f5;
  padding: 1px 5px;
  border-radius: 4px;
}

.note {
  border-left: 3px solid var(--line);
  padding: 2px 0 2px 16px;
  color: var(--muted);
  font-size: 16px;
  margin: 24px 0;
}

footer {
  border-top: 1px solid var(--line);
  margin-top: 56px;
  padding-top: 20px;
  font-size: 14px;
  color: var(--muted);
}

footer a { color: var(--muted); }

@media (max-width: 600px) {
  .wrap { padding: 32px 18px 72px; }
  h1 { font-size: 26px; }
  p.lede { font-size: 17px; }
}