.preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #0B2239;
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.preloader.hidden {
  opacity: 0;
  visibility: hidden;
}

.preloader-spinner {
  width: 60px;
  height: 60px;
  border: 3px solid rgba(0, 224, 255, 0.2);
  border-top-color: #00E0FF;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  box-shadow: 0 0 15px rgba(0, 224, 255, 0.5);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}