/* Cacher le SVG par defaut et le remplacer */
button.wp-block-navigation__responsive-container-open svg {
    display: none;
}

/* Bouton hamburger */
button.wp-block-navigation__responsive-container-open {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 32px;
    height: 22px;
    padding: 0;
    background: transparent;
    border: none;
    cursor: pointer;
    position: relative;
}

/* Les 3 lignes via pseudo-elements + box-shadow */
button.wp-block-navigation__responsive-container-open::before,
button.wp-block-navigation__responsive-container-open::after {
    content: '';
    display: block;
    width: 100%;
    height: 3px;
    background-color: rgb(0, 0, 0);
    border-radius: 3px;
}

button.wp-block-navigation__responsive-container-open::before {
    box-shadow: 0 10px 0 rgb(0, 0, 0); /* ligne du milieu */
}

button.wp-block-navigation__responsive-container-open::after {
    width: 65%;
}