:root {
  color-scheme: light dark;
  --bg: #f6fbfb;
  --text: #041318;
  --muted: #3d5257;
  --accent: #1aa8a3;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #041318;
    --text: #e8f4f4;
    --muted: #9db3b6;
    --accent: #35d4cf;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
}
main { max-width: 32rem; }
h1 {
  font-size: 1.5rem;
  margin: 0 0 1rem;
  border-left: 4px solid var(--accent);
  padding-left: 0.75rem;
}
p { margin: 0 0 0.75rem; color: var(--muted); }