.section-title .card-body .card-title {
    position: relative;
}

/* Línea gris (fondo) */
.section-title .card-body .card-title::before {
    content: "";
    position: absolute;
    left: 0;
    bottom: -8px;             
    width: 100%;
    height: 2px;
    background-color: var(--bs-border-color);
}

/* Línea azul (encima) */
.section-title .card-body .card-title::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -8px;             /* mismo valor */
    width: 10%;
    height: 2px;
    background-color: var(--bs-primary);
}

.card-header{
    border-bottom:0px;
}