:root {
  --bg: #f5f5f5;
  --card: #ffffff;
  --label: #111111;
  --secondary: #6b6b6b;
  --accent: #3d3d40;
  --separator: #ebebeb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--label);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 28px 16px 64px;
}

header { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { font-weight: 600; margin: 0; }
header nav a, .links a { color: var(--label); text-decoration: none; font-weight: 600; }
header nav a { color: var(--secondary); font-weight: 500; font-size: 14px; margin-left: 16px; }

h1 { font-size: 30px; line-height: 1.2; font-weight: 600; letter-spacing: -0.3px; margin: 32px 0 12px; }
h2 { font-size: 17px; font-weight: 600; margin: 28px 0 8px; }
p, li { margin: 0 0 12px; }
.lead { font-size: 17px; }
.muted { color: var(--secondary); }
.updated { color: var(--secondary); font-size: 14px; margin-bottom: 24px; }

.card {
  background: var(--card);
  border-radius: 22px;
  padding: 20px;
  margin: 24px 0;
}
.card h2:first-child { margin-top: 0; }
.card p:last-child, .card ul:last-child { margin-bottom: 0; }

.links { display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0; }
.links a {
  display: inline-block;
  background: var(--card);
  border-radius: 999px;
  padding: 13px 22px;
}
.links a.primary { background: var(--accent); color: #ffffff; }

ul { padding-left: 20px; }
dl { margin: 0; }
dt { font-weight: 600; margin-top: 16px; }
dd { margin: 4px 0 0; color: var(--label); }
dt:first-child { margin-top: 0; }

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

footer {
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--separator);
  color: var(--secondary);
  font-size: 14px;
}
footer a { color: var(--secondary); margin-right: 16px; }