:root {
  --bg: #f7f6f2;
  --fg: #16161a;
  --muted: #5d5d66;
  --accent: #3b5bdb;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111114;
    --fg: #ececf1;
    --muted: #9a9aa6;
    --accent: #8ca3ff;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

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

body {
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
}

main {
  max-width: 36rem;
  text-align: center;
}

.mark {
  display: inline-grid;
  place-items: center;
  width: 3.5rem;
  height: 3.5rem;
  margin: 0 0 1.5rem;
  border: 2px solid var(--accent);
  border-radius: 0.9rem;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.04em;
}

h1 {
  margin: 0;
  font-size: clamp(2.25rem, 7vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.lead {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 1.125rem;
}