:root {
  --bg: #fafaf9;
  --text: #1c1917;
  --muted: #78716c;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #1c1917; --text: #fafaf9; --muted: #a8a29e; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 18px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding: 0 1.25rem;
}
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 40rem;
  width: 100%;
  margin: 0 auto;
}
h1 { font-size: clamp(2.25rem, 6vw, 3.5rem); line-height: 1.1; margin: 0 0 .5rem; }
.lead { color: var(--muted); margin: 0; font-size: 1.2rem; }
footer { max-width: 40rem; width: 100%; margin: 0 auto; color: var(--muted); font-size: .9rem; }