:root {
  --fg: #1c1c1e;
  --bg: #fbfbfd;
  --accent: #f6821f;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--fg);
  background: var(--bg);
}

main {
  max-width: 40rem;
  padding: 2rem;
  text-align: center;
}

h1 {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  margin-bottom: 0.75rem;
}

p {
  line-height: 1.8;
  color: #52525b;
}

#clock {
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  font-weight: 600;
}