@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Spinner Container */
#spinner {
  display: none; 
  justify-content: center;
  align-items: center;
  background-color: rgba(0, 0, 0, 0.5);
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;
  box-sizing: border-box;
}

/* Spinner Style */
.spinner {
  border: 8px solid #f3f3f3;
  border-radius: 50%;
  border-top: 8px solid #4caf50;
  width: 60px;
  height: 60px;
  animation: spin 2s linear infinite;
  box-sizing: border-box;
  aspect-ratio: 1 / 1;
}

/* Dostosowanie responsywne dla urządzeń mobilnych */
@media (max-width: 600px) {
  .spinner {
    width: 40px;
    height: 40px;
    border-width: 6px;
    max-width: 40px;
    max-height: 40px;
  }
}