/* Custom styles */
    .tab-content {
      display: none;
    }
    .active-tab-content {
      display: block;
      animation: fadeIn 0.3s ease;
    }
    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(10px); }
      to { opacity: 1; transform: translateY(0); }
    }
    .toast-notification {
      transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    }
    .toast-notification.show {
      transform: translateX(-50%) translateY(0);
      opacity: 1;
    }
    .full-iframe-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: white;
      z-index: 9999;
      display: none;
    }
    .full-iframe-overlay iframe {
      width: 100%;
      height: 100%;
      border: none;
    }
    .close-iframe-btn {
      position: absolute;
      top: 20px;
      right: 30px;
      background: #dc2626;
      color: white;
      border: none;
      border-radius: 50%;
      width: 40px;
      height: 40px;
      font-size: 24px;
      cursor: pointer;
      z-index: 10000;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s;
    }
    .close-iframe-btn:hover {
      background: #b91c1c;
      transform: scale(1.05);
    }
    .modal {
      display: none;
      position: fixed;
      z-index: 9998;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      background-color: rgba(0,0,0,0.5);
      align-items: center;
      justify-content: center;
    }
    .modal-content {
      background-color: white;
      border-radius: 1rem;
      max-width: 500px;
      width: 90%;
      padding: 1.5rem;
      animation: slideIn 0.3s ease;
      max-height: 90vh;
      overflow-y: auto;
    }
    @keyframes slideIn {
      from { transform: translateY(-50px); opacity: 0; }
      to { transform: translateY(0); opacity: 1; }
    }
    .modal-close {
      float: right;
      font-size: 28px;
      font-weight: bold;
      cursor: pointer;
      color: #666;
      transition: color 0.2s;
    }
    .modal-close:hover {
      color: #000;
    }
    .btn-gift, .btn-buy, .btn-pay, .btn-disabled {
      transition: all 0.2s ease;
    }
    .btn-gift:hover, .btn-buy:hover, .btn-pay:hover {
      transform: translateY(-2px);
    }
    .product-card {
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .product-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -12px rgba(0, 0, 0, 0.15);
    }
    .form-group {
      margin-bottom: 1rem;
    }
    .form-group label {
      display: block;
      font-weight: 500;
      margin-bottom: 0.5rem;
      color: #374151;
    }
    .form-group input {
      width: 100%;
      padding: 0.75rem;
      border: 1px solid #d1d5db;
      border-radius: 0.75rem;
      transition: all 0.2s;
    }
    .form-group input:focus {
      outline: none;
      border-color: #4f46e5;
      ring: 2px solid #4f46e5;
    }