/* Hide only Zeina's subject containers; never hide the following author line. */
.css-remove-subject-post-marker + div.post-title,
.css-remove-subject-editor-marker + div:has(input[name="subject"]) {
    display: none !important;
}

/* Remove the gap left by Zeina's quick-reply subject container. */
.css-remove-subject-editor-marker ~ div.mt-3 {
    margin-top: 0 !important;
}

/* The preview occurs before the editor marker in the document. */
body:has(.css-remove-subject-editor-marker) #preview .postbody > h3:first-child,
body:has(.css-remove-subject-editor-marker) #preview .post-title:first-child {
    display: none !important;
}