:root {
  --bg: #f5f7f7;
  --fg: #20262b;
  --muted: #626d74;
  --accent: #2fae76;
  --line: #dde3e5;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header {
  border-bottom: 1px solid var(--line);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

h1 {
  font-size: 28px;
  margin: 0 0 4px;
  font-weight: 600;
}

header .tagline {
  color: var(--muted);
  font-size: 15px;
  margin: 0;
}

h2 {
  font-size: 19px;
  margin-top: 32px;
  margin-bottom: 8px;
}

h3 {
  font-size: 16px;
  margin-top: 24px;
  margin-bottom: 6px;
}

p, ul {
  margin: 0 0 16px;
}

ul {
  padding-left: 20px;
}

li {
  margin-bottom: 6px;
}

code {
  background: var(--line);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 15px;
}

a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}

.eyebrow {
  font-size: 13px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0 0 8px;
}

nav {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

nav a { margin-right: 16px; }