#jdx-talk-window {
    font-family: 'Segoe UI', 'Helvetica Neue', Helvetica, Arial, sans-serif !important;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
#jdx-talk-window button,
#jdx-talk-window input,
#jdx-talk-window textarea,
#jdx-talk-window select { font-family: inherit !important; }

/* tudo normal (400), menos os ícones do Font Awesome */
#jdx-talk-window :where(*:not(i):not(.fas):not(.far):not(.fab):not(.fa)) { font-weight: 400 !important; }

/* só nomes com um pouco mais de corpo, como no WhatsApp */
#jdx-talk-window .jdx-chat-user strong,
#jdx-talk-window .jdx-talk-bar-info strong,
#jdx-talk-window .jdx-bub-autor { font-weight: 500 !important; }