:root {
  color-scheme: dark;
  --bg: #0b0d12;
  --fg: #f2f3f5;
  --muted: #8b93a1;
  --accent: #5b8cff;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  text-align: center;
  padding: 1.5rem;
}

.label {
  margin: 0;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

h1 {
  margin: 0.25rem 0 2rem;
  font-size: clamp(1.75rem, 6vw, 3rem);
  font-weight: 600;
}

.countdown {
  display: flex;
  gap: clamp(0.75rem, 4vw, 2rem);
  justify-content: center;
}

.unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 4.5rem;
}

.unit span {
  font-size: clamp(2rem, 8vw, 4rem);
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.unit small {
  margin-top: 0.5rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.75rem;
}

.done {
  margin-top: 2rem;
  font-size: 1.5rem;
  color: var(--accent);
}