:root {
  --slate: #15293d;
  --slate-soft: #1e3952;
  --teal: #4ecdc4;
  --ink: #16202b;
  --muted: #5a6b7d;
  --line: #dde3ea;
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --measure: 34rem;
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- header ---------- */

header {
  background: var(--slate);
  color: #fff;
  padding: 18px 0;
}

header .wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

header img { width: 32px; height: 32px; border-radius: 7px; display: block; }

header a.brand {
  color: #fff;
  text-decoration: none;
  font-weight: 650;
  font-size: 19px;
  letter-spacing: -0.01em;
  margin-right: auto;
}

header nav { display: flex; gap: 18px; }

header nav a {
  color: #c6d4e2;
  text-decoration: none;
  font-size: 15px;
}

header nav a:hover, header nav a:focus { color: #fff; text-decoration: underline; }

/* ---------- type ---------- */

main { padding: 48px 0 72px; }

h1 {
  font-size: 2rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.6em;
}

h2 {
  font-size: 1.25rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 2.4em 0 0.6em;
  padding-top: 1.4em;
  border-top: 1px solid var(--line);
}

h2:first-of-type { border-top: 0; padding-top: 0; margin-top: 1.6em; }

h3 { font-size: 1.02rem; margin: 1.8em 0 0.4em; }

p, ul, ol { margin: 0 0 1.1em; }

ul, ol { padding-left: 1.3em; }

li { margin-bottom: 0.4em; }

a { color: #10557a; }

.lede {
  font-size: 1.12rem;
  color: var(--muted);
  margin-bottom: 1.8em;
}

.meta {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 2.2em;
}

strong { font-weight: 650; }

/* ---------- bits ---------- */

.callout {
  background: var(--bg-soft);
  border-left: 3px solid var(--teal);
  padding: 16px 18px;
  margin: 0 0 1.6em;
  border-radius: 0 6px 6px 0;
}

.callout p:last-child { margin-bottom: 0; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.6em;
  font-size: 0.95rem;
}

th, td {
  text-align: left;
  padding: 9px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th { font-weight: 650; background: var(--bg-soft); }

code {
  background: var(--bg-soft);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* ---------- footer ---------- */

footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 56px;
  color: var(--muted);
  font-size: 0.9rem;
}

footer nav { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 10px; }

@media (max-width: 480px) {
  body { font-size: 16px; }
  h1 { font-size: 1.6rem; }
  main { padding: 32px 0 48px; }
}