/* Mockup container buat preview di desktop */
    .mobile-preview {
      width: 390px; /* iPhone 14 width */
      max-width: 100%;
      border: 8px solid #333;
      border-radius: 20px;
      box-shadow: 0 0 20px rgba(0,0,0,0.3);
      margin: 20px auto;
      background: #fff;
    }