/* Responsive layout */
    .container2 {
      max-width: 600px;
      margin: auto;
      padding: 20px;
    }

    .row2 {
      display: flex;
      flex-wrap: wrap;
      margin-bottom: 15px;
    }

    .col2-25, .col2-75 {
      width: 100%;
    }

    label2 {
      font-weight: bold;
      margin-bottom: 5px;
      display: block;
    }

    
   

    
    /* Spinner overlay */
    #overlaySpinner {
      display: none;
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background-color: rgba(0,0,0,0.6);
      z-index: 9999;
      justify-content: center;
      align-items: center;
      flex-direction: column;
      color: white;
      font-size: 18px;
    }

    .spinner {
      border: 6px solid #f3f3f3;
      border-top: 6px solid #3498db;
      border-radius: 50%;
      width: 60px;
      height: 60px;
      animation: spin 1s linear infinite;
      margin-bottom: 15px;
    }

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