:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6a6a6a;
  --accent: #2a6df4;
  --rule: #e6e6e6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #e9e9ea;
    --muted: #9aa0a6;
    --accent: #6ea8ff;
    --rule: #2a2d33;
  }
}

* { box-sizing: border-box; }

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

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

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 5rem 1.5rem 3rem;
}

/* In the page's HTML but not rendered on screen; aria-hidden keeps screen
   readers from announcing it. */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

section { margin: 2rem 0; }

h2 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.4rem;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

.links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
}

footer {
  margin-top: 3.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9rem;
}