/* V17 — menu mobile en accordéon. Le desktop n'est pas modifié. */
.nav-submenu-toggle {
  display: none;
}

@media (max-width: 900px) {
  /* Les groupes à sous-menu deviennent deux colonnes : lien + petite flèche. */
  .site-header_nav .nav-group {
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) 44px !important;
    align-items: center !important;
    width: 100% !important;
    position: relative !important;
  }

  .site-header_nav .nav-group > a {
    grid-column: 1 !important;
    grid-row: 1 !important;
    min-width: 0 !important;
  }

  .nav-submenu-toggle {
    display: inline-flex !important;
    grid-column: 2 !important;
    grid-row: 1 !important;
    width: 40px !important;
    height: 40px !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 0 !important;
    margin: 0 !important;
    border: 0 !important;
    background: transparent !important;
    color: inherit !important;
    cursor: pointer !important;
    font: inherit !important;
  }

  .nav-submenu-toggle span {
    display: block !important;
    font-size: 1.2rem !important;
    line-height: 1 !important;
    transform: rotate(0deg);
    transition: transform .18s ease;
  }

  .site-header_nav .nav-group.is-mobile-open > .nav-submenu-toggle span {
    transform: rotate(180deg);
  }

  /* Toujours fermés par défaut sur mobile. */
  .site-header_nav .nav-group > .nav-submenu {
    display: none !important;
    position: static !important;
    grid-column: 1 / -1 !important;
    grid-row: 2 !important;
    width: 100% !important;
    min-width: 0 !important;
    margin: 0 !important;
    padding: 4px 0 8px 16px !important;
    border: 0 !important;
    box-shadow: none !important;
    background: transparent !important;
  }

  .site-header_nav .nav-group.is-mobile-open > .nav-submenu {
    display: grid !important;
  }

  .site-header_nav .nav-submenu > a {
    width: 100% !important;
    padding: 9px 8px !important;
  }

  /* Le bouton Administration doit rester visible dans le menu mobile. */
  .site-header_nav .button-admin {
    display: inline-flex !important;
    visibility: visible !important;
    opacity: 1 !important;
    align-items: center !important;
    justify-content: center !important;
  }
}