#spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 100vw;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
  }

  #spinner-overlay.hidden {
    opacity: 0;
    pointer-events: none;
  }

  .lds-dual-ring {
    display: inline-block;
    width: 64px;
    height: 64px;
  }

  .lds-dual-ring:after {
    content: " ";
    display: block;
    width: 46px;
    height: 46px;
    margin: 1px;
    border-radius: 50%;
    border: 5px solid #007bff;
    border-color: #007bff transparent #007bff transparent;
    animation: lds-dual-ring 1.2s linear infinite;
  }

  @keyframes lds-dual-ring {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }