:root {
  --ink: #17202a;
  --muted: #5b6b7c;
  --line: #e2e8ef;
  --accent: #1d5c96;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  padding: 0 20px;
  background: #fff;
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

main {
  max-width: 46rem;
  margin: 0 auto;
  padding: 56px 0 80px;
}

header {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 24px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.mark {
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.mark-sub {
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--muted);
}

h1 {
  font-size: 2.1rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}

h2 {
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  margin: 2.4em 0 0.6em;
}

.lede {
  font-size: 1.2rem;
  color: var(--muted);
  margin: 0 0 2em;
}

.updated {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: -4px;
}

p { margin: 0 0 1.1em; }

ul, ol { padding-left: 1.3em; margin: 0 0 1.2em; }

li { margin-bottom: 0.4em; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }

a:hover { text-decoration-thickness: 2px; }

footer {
  margin-top: 3.5em;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

footer p { margin: 0; }