themes-wordpress/seedlet-blocks/sass/blocks/_navigation.scss

.wp-block-navigation__responsive-container {
	&.has-modal-open {
		.wp-block-navigation-link {
			font-family: var(--wp--preset--font-family--playfair-display);
			font-size: 32px;
			font-weight: 400;
			line-height: 60px;
			&.has-child {
				.wp-block-navigation-link{
					font-style: italic;
					font-size: 24px;
					line-height: 30px;
				}
			}
		}
	}
}