.preloader {
 /* position: fixed;
  top: 0;
  left: 0;*/
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.9);
  /*display: flex;*/
  justify-content: center;
  align-items: center;
  /*z-index: 9999;*/
  opacity: 0;
  /*visibility: hidden;*/
  transition: opacity 0.3s, visibility 0.3s;
}

.preloader.active {
  opacity: 1;
  visibility: visible;
  background: #f9f9f9;
}

.loader {
  text-align: center;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 5px solid #f3f3f3;
  border-top: 5px solid #3498db;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 15px;
}

.loading-text {
  color: #333;
  font-size: 18px;
  margin-top: 10px;
}

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