:root {
  --ink: #1d2433;
  --muted: #5a6273;
  --paper: #fbfbf8;
  --line: #dcdcd4;
  --link: #1f5fa8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e6e8ee;
    --muted: #a3a9b6;
    --paper: #15181e;
    --line: #2c313b;
    --link: #8bb8ef;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}
main { max-width: 40rem; margin: 0 auto; padding: 3rem 16px 4rem; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 1rem; }
h2 { font-size: 1.25rem; margin: 2.25rem 0 0.5rem; }
h3 { font-size: 1.05rem; margin: 1.5rem 0 0.25rem; }
p, ul { margin: 0 0 1rem; }
ul { padding-left: 1.25rem; }
li { margin-bottom: 0.35rem; }
a { color: var(--link); }
.lead { font-size: 1.15rem; color: var(--muted); }
.join {
  display: inline-block;
  margin: 0.5rem 0 1.5rem;
  padding: 0.7rem 1.2rem;
  border-radius: 10px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-weight: 600;
}
.join:focus-visible, a:focus-visible { outline: 3px solid var(--link); outline-offset: 2px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 3rem 0; }
footer { color: var(--muted); font-size: 0.9rem; }