/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeOut {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-20px);
  }
}

.fade-in {
  animation: fadeIn 0.4s ease-out forwards;
}

.fade-out {
  animation: fadeOut 0.4s ease-in forwards;
}

/* Ensure screens are hidden by default via class, not just inline style, to help with initial state if needed */
.calculator-screen {
  /* Existing styles... */
  opacity: 1; /* Default state when visible */
}