:root {
  --bg: #fbfbfa;
  --text: #1c1c1e;
  --muted: #5c5c61;
  --line: #dcdcd8;
  --button-bg: #1c1c1e;
  --button-text: #fbfbfa;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161618;
    --text: #ececea;
    --muted: #a2a2a8;
    --line: #333336;
    --button-bg: #ececea;
    --button-text: #161618;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}
main { flex: 1; width: 100%; max-width: 40rem; margin: 0 auto; padding: 6rem 1rem 3rem; }
h1 { margin: 0 0 .75rem; font-size: 2.5rem; line-height: 1.1; letter-spacing: -.02em; }
h2 { margin: 0 0 .5rem; font-size: 1.15rem; }
.lead { margin: 0 0 3rem; font-size: 1.2rem; color: var(--muted); }
section { padding-top: 1.5rem; border-top: 1px solid var(--line); }
code { font: .95em ui-monospace, SFMono-Regular, Menlo, monospace; }
.button {
  display: inline-block;
  padding: .7rem 1.2rem;
  border-radius: 8px;
  background: var(--button-bg);
  color: var(--button-text);
  text-decoration: none;
  font-weight: 600;
}
.button:hover { opacity: .85; }
.button:focus-visible { outline: 3px solid var(--text); outline-offset: 3px; }
.note { color: var(--muted); font-size: .95rem; }
footer { padding: 1.5rem 1rem; text-align: center; color: var(--muted); font-size: .9rem; }
footer p { margin: 0; }