.pulsing:before {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  content: '';
  box-shadow: inset 0 0 0 3px #FF3;
  transition: transform 0.2s, opacity 0.2s;
  animation: pulsing 1s infinite;
}

@keyframes pulsing {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(2);
    opacity: 0;
  }
  100% {
    transform: scale(1);
    opacity: 0;
  }
}

/* === Validazione moduli: evidenziazione campi mancanti/non validi === */

.mc-field-invalid {
  position: relative;
  border-left: 4px solid #dc3545;
  background-color: rgba(220, 53, 69, 0.06);
  border-radius: 4px;
  padding: 6px 10px !important;
  animation: mcInvalidPulse 1.4s ease-in-out 2;
}

.mc-field-invalid > label {
  color: #dc3545 !important;
  font-weight: 600;
}

.mc-field-invalid .form-control,
.mc-field-invalid .form-control-lg,
.mc-field-invalid input[type="text"],
.mc-field-invalid input[type="number"],
.mc-field-invalid input[type="email"],
.mc-field-invalid input[type="date"],
.mc-field-invalid textarea,
.mc-field-invalid select,
.mc-field-invalid .select2-selection {
  border: 1px solid #dc3545 !important;
  box-shadow: 0 0 0 0.15rem rgba(220, 53, 69, 0.18) !important;
}

.mc-field-invalid .select2-container--default .select2-selection--single {
  border: 1px solid #dc3545 !important;
}

@keyframes mcInvalidPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(220, 53, 69, 0.0); }
  50%      { box-shadow: 0 0 0 6px rgba(220, 53, 69, 0.18); }
}

.mc-error-text {
  display: inline-block;
  font-size: 14px !important;
  font-weight: 600 !important;
  color: #dc3545 !important;
  margin-top: 4px;
}

.mc-error-text::before {
  content: '\26A0';
  margin-right: 6px;
}

/* Marker rosso sul nav-tab che contiene errori */
.nav-tabs .mc-tab-invalid {
  color: #dc3545 !important;
  font-weight: 700;
}

.nav-tabs .mc-tab-invalid::after {
  content: ' \25CF';
  color: #dc3545;
  font-size: 10px;
  vertical-align: super;
  margin-left: 4px;
  animation: mcTabBlink 1.2s ease-in-out infinite;
}

@keyframes mcTabBlink {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.35; }
}

/* Banner alert prominente per il messaggio di errore generale */
#error-message.mc-error-banner {
  background-color: #f8d7da;
  border: 1px solid #f5c6cb;
  border-left: 5px solid #dc3545;
  color: #721c24 !important;
  padding: 14px 18px;
  border-radius: 4px;
  margin: 10px 0;
  box-shadow: 0 2px 10px rgba(220, 53, 69, 0.18);
  font-weight: 600;
  animation: mcBannerIn 0.35s ease-out;
}

#error-message.mc-error-banner::before {
  content: '\26A0';
  font-size: 20px;
  margin-right: 10px;
}

#error-extra-data.mc-error-list {
  display: block;
  background-color: #fff5f5;
  border: 1px solid #f5c6cb;
  border-radius: 4px;
  padding: 10px 14px;
  margin: 6px 0 10px;
  color: #721c24 !important;
  font-size: 14px;
  font-weight: 500;
}

@keyframes mcBannerIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}