/* Sputnik Day Banner */
.sputnik-day::before {
  content: '🛰️ Sputnik 1 launched this day in 1957 — the Space Age begins';
  display: block;
  text-align: center;
  background: linear-gradient(135deg, #1a0a2e 0%, #2e1a4e 50%, #1a0a2e 100%);
  color: #d0b0ff;
  padding: 0.75rem;
  font-weight: 600;
  font-size: 1.125rem;
  letter-spacing: 0.04em;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}