.btn-open {
  padding: 12px 24px;
  font-size: 16px;
  background: #0066ff;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: 0.3s ease;
}

.btn-open:hover {
  background: #0050cc;
}

.payment-popup-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 999;
}

.payment-popup {
  background: #fff;
  padding: 30px 25px;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  width: 90%;
  max-width: 400px;
  animation: fadeIn 0.3s ease-in-out;
}

.payment-popup h2 {
  margin-top: 0;
  font-size: 22px;
  text-align: center;
  margin-bottom: 20px;
  color: #333;
}

.payment-popup input[type="email"],
.payment-popup input[type="number"] {
  width: 100%;
  padding: 12px;
  margin: 10px 0 20px 0;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-size: 16px;
}

.payment-popup input[type="submit"] {
  width: 100%;
  padding: 12px;
  background: #28a745;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s ease;
}

.payment-popup input[type="submit"]:hover {
  background: #218838;
}

.payment-close-btn {
  position: absolute;
  top: 15px;
  right: 20px;
  background: transparent;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: #555;
}

@keyframes fadeIn {
  from {
    transform: scale(0.95);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}