:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #555555;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111111;
    --fg: #f2f2f2;
    --muted: #aaaaaa;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  line-height: 1.6;
}

main {
  max-width: 640px;
  text-align: center;
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  word-break: keep-all;
}

p {
  margin: 0;
  color: var(--muted);
  word-break: keep-all;
}