.custom-alert {
    position: fixed;
    top: 20px;
    right: 20px;
    min-width: 300px;
    z-index: 9999;
    border: none;
    border-radius: 12px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    overflow: hidden; /* Necesario para la barra */
    animation: slideIn 0.5s ease-out forwards;
    width: 12px;
}

/* Animación de entrada */
@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Estenedor de la barra */
.progress-bar-container {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(0, 0, 0, 0.05);
}

/* Animación de la barra de progreso */
.progress-bar-fill {
    height: 100%;
    background-color: #198754; /* Verde éxito */
    width: 100%;
    animation: shrink 3s linear forwards;
}

@keyframes shrink {
    from { width: 100%; }
    to { width: 0%; }
}