:root {
  color-scheme: light;
  --ink: #18212b;
  --muted: #637180;
  --line: #d8dee5;
  --paper: #fff;
  --wash: #f3f6f8;
  --accent: #0b6e69;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--wash); color: var(--ink); font: 16px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
header { border-bottom: 1px solid var(--line); background: var(--paper); }
.bar, main, footer { width: min(920px, calc(100% - 32px)); margin: 0 auto; }
.bar { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { color: var(--ink); font-weight: 700; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: 12px; justify-content: flex-end; }
nav a { color: var(--accent); font-size: 13px; }
main { padding: 42px 0 64px; }
article { background: var(--paper); border: 1px solid var(--line); border-radius: 7px; padding: clamp(20px, 4vw, 42px); }
h1 { margin: 0 0 8px; font-size: clamp(28px, 5vw, 42px); line-height: 1.12; letter-spacing: 0; }
h2 { margin: 32px 0 8px; font-size: 22px; line-height: 1.25; }
h3 { margin: 22px 0 6px; font-size: 17px; }
p, ul, ol { max-width: 75ch; }
.meta { color: var(--muted); font-size: 13px; }
a { color: var(--accent); }
code { font-size: .92em; }
footer { padding: 0 0 36px; color: var(--muted); font-size: 13px; }
footer a { margin-right: 12px; }
@media (max-width: 640px) {
  .bar { align-items: flex-start; flex-direction: column; justify-content: center; padding: 14px 0; }
  nav { justify-content: flex-start; }
  main { padding-top: 24px; }
  article { padding: 20px; }
}