spinner.html

<div style="
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  font-family: system-ui, -apple-system, sans-serif;
">
  <!-- Spinner container -->
  <div style="
    position: relative;
    width: 64px;
    height: 64px;
    margin-bottom: 1.5rem;
  ">
    <!-- Static ring -->
    <div style="
      position: absolute;
      width: 100%;
      height: 100%;
      border: 4px solid #e2e8f0;
      border-radius: 50%;
    "></div>
    <!-- Animated spinner -->
    <div style="
      position: absolute;
      width: 100%;
      height: 100%;
      border: 4px solid transparent;
      border-top-color: #3b82f6;
      border-radius: 50%;
      animation: spin 1s linear infinite;
    "></div>
  </div>

  <!-- Text content -->
  <h2 style="
    margin: 0 0 0.5rem 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: #475569;
  ">Generating your application...</h2>
  
  <p style="
    margin: 0;
    font-size: 0.875rem;
    color: #64748b;
  ">This may take a few moments</p>

  <style>
    @keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }
  </style>
</div>