:root {
  --bg: #fffaf0;
  --surface: #fff5dc;
  --ink: #2b4144;
  --muted: #5d7b7f;
  --accent: #1f7a85;
  --line: #ffeec6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14282c;
    --surface: #1b343a;
    --ink: #e9f2f1;
    --muted: #a7c2c4;
    --accent: #6fd3dd;
    --line: #26454c;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 3rem 16px 5rem;
}
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 .25rem; }
h2 { font-size: 1.25rem; margin: 2.25rem 0 .5rem; }
h3 { font-size: 1.05rem; margin: 1.5rem 0 .25rem; color: var(--accent); }
p, li { color: var(--ink); }
.meta, .muted { color: var(--muted); font-size: .9rem; }
.meta { margin: 0 0 2rem; }
a { color: var(--accent); }
.back { margin: 0 0 1.5rem; font-size: .9rem; }
.callout {
  background: var(--surface);
  border: 2px solid var(--line);
  border-radius: 14px;
  padding: 1rem 1.15rem;
  margin: 1.5rem 0;
}
ul { padding-left: 1.2rem; }
li { margin: .35rem 0; }
.links { list-style: none; padding: 0; }
.links li { margin: .75rem 0; }
footer { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }