:root {
  --bg: #fbfbf9;
  --fg: #1c1c1a;
  --muted: #7a7a74;
  --rule: #e2e2dd;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101012;
    --fg: #e8e8e4;
    --muted: #8d8d88;
    --rule: #26262a;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding: 0 1.5rem;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 34rem;
  width: 100%;
  margin: 0 auto;
  padding: 4rem 0;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.note {
  margin: 0;
  font-size: 1.1rem;
  color: var(--muted);
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  width: 3rem;
  margin: 2rem 0;
}

.hint {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  color: var(--fg);
}