/* 1. On colore la bordure du bouton */
.navbar-toggler {
    border-color: #010156 !important;
}

/* 2. On nettoie l'icône et on applique le bleu proprement */
.navbar-toggler .icon-menu,
.navbar-toggler-icon {
    /* On retire les masques et les images qui créent le bug */
    mask-image: none !important;
    -webkit-mask-image: none !important;
    background-color: transparent !important;
    
    /* On injecte le SVG bleu tout seul */
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%23010156' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
    
    background-repeat: no-repeat !important;
    background-position: center !important;
    background-size: contain !important;
    display: inline-block !important;
    width: 1.5rem !important;
    height: 1.5rem !important;
}