/* Red button styling */
.sda-button, #sda-choose-btn {
  background-color: #d32f2f;
  color: #ffffff;
  border: none;
  padding: 12px 28px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 17px;
  font-weight: 600;
  box-shadow: 0 3px 8px rgba(0,0,0,0.25);
  transition: background-color 0.2s ease, transform 0.06s ease;
}
.sda-button:hover, #sda-choose-btn:hover {
  background-color: #b71c1c;
  transform: translateY(-1px);
}

/* Flatpickr popup visibility */
.flatpickr-calendar {
  z-index: 999999 !important;
}

@media (prefers-color-scheme: dark) {
  .sda-button, #sda-choose-btn {
    box-shadow: 0 3px 8px rgba(0,0,0,0.6);
  }
}