/* ============================================
   ✨ ANIMACIONES Y TRANSICIONES
   ============================================ */
button, .btn, .tarjeta, .curso-item {
  transition: var(--transicion-rapida);
}
.tarjeta:hover {
  transform: translateY(-2px);
  box-shadow: var(--sombra-hover);
}
.btn:hover {
  filter: brightness(1.07);
  transform: translateY(-1px);
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in {
  animation: fadeIn .3s ease forwards;
}
@keyframes slideInLeft {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
.spinner {
  width: 24px; height: 24px;
  border: 3px solid var(--borde);
  border-top-color: var(--color-marca);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
.skeleton {
  background: linear-gradient(90deg, var(--fondo-suave) 25%, var(--superficie-2) 50%, var(--fondo-suave) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radio-borde-sm);
}
@keyframes toastIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}
@keyframes toastOut {
  from { transform: translateX(0); opacity: 1; }
  to { transform: translateX(100%); opacity: 0; }
}
.toast {
  position: fixed;
  top: 20px; right: 20px;
  padding: 14px 20px;
  border-radius: var(--radio-borde-sm);
  background: var(--superficie);
  border: 1px solid var(--borde);
  box-shadow: var(--sombra-hover);
  z-index: 200;
  animation: toastIn .3s ease;
  max-width: 360px;
}
.toast.saliendo { animation: toastOut .3s ease forwards; }
.toast-exito { border-left: 4px solid var(--exito); }
.toast-error { border-left: 4px solid var(--error); }
.toast-advertencia { border-left: 4px solid var(--advertencia); }