:root {
  color-scheme: dark;
  --bg1: #111827;
  --bg2: #1e3a8a;
  --text: #f8fafc;
  --muted: #cbd5e1;
  --card: rgba(15, 23, 42, 0.72);
  --border: rgba(255, 255, 255, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(96, 165, 250, 0.35), transparent 32rem),
    linear-gradient(135deg, var(--bg1), var(--bg2));
}

.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}

.card {
  width: min(960px, 100%);
  padding: clamp(2rem, 6vw, 5rem);
  text-align: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 2rem;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(18px);
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 8vw, 6.5rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

.countdown {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(0.75rem, 2vw, 1.25rem);
  margin-top: clamp(2rem, 6vw, 4rem);
}

.unit {
  padding: clamp(1rem, 3vw, 2rem) 0.5rem;
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  background: rgba(255, 255, 255, 0.08);
}

.unit span {
  display: block;
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1;
}

.unit small {
  display: block;
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: clamp(0.8rem, 1.8vw, 1rem);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.status {
  margin: 2rem 0 0;
  color: var(--muted);
  font-size: clamp(0.95rem, 2vw, 1.15rem);
}

.done .countdown {
  opacity: 0.55;
}

.done .status {
  color: #fef08a;
  font-weight: 700;
}

@media (max-width: 700px) {
  .countdown {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}