Right now the rules to render the discussion titles is:
.DiscussionListItem-title {
color: #111;
font-weight: normal;
}
.read .DiscussionListItem-title {
color: #7c7c7c;
}
and
.unread .DiscussionListItem-title {
font-weight: 600;
}
What about adding:
.read .DiscussionListItem-title {
color: #111;
}
.unread .DiscussionListItem-title {
font-weight: normal;
}
.unread .DiscussionListItem-title::after {
content: ' 🔥';
}
as your custom CSS in the admin panel section Appearance
?