diff --git a/inst/reveal.js-5.1.0/css/theme/source/ids.scss b/inst/reveal.js-5.1.0/css/theme/source/ids.scss
index 20e9416..2f65834 100644
--- a/inst/reveal.js-5.1.0/css/theme/source/ids.scss
+++ b/inst/reveal.js-5.1.0/css/theme/source/ids.scss
@@ -612,18 +612,21 @@
   text-indent: -22px ;
 }
 
-.csl-entry::first-line {
-  color: #253b43;
-}
-
-.csl-entry {
+// .references scopes these above pandoc's CSL defaults (div.csl-entry), which
+// otherwise win on specificity and pin margin-bottom to 0em.
+.references .csl-entry {
   color: #888888;
+  margin-bottom: 0.5em;
 }
 
-/* Add line break after authors and year*/
-.csl-entry :first-child::before {
-  content: "\a";
-  white-space: pre;
+// "Authors (Year):" as a bold dark first line; the theme template's JS wraps
+// the leading text of each entry in .csl-authors-year (see default.html) --
+// which part of an entry citeproc wraps in spans depends on the entry type, so
+// a CSS-only break cannot place it reliably.
+.csl-entry .csl-authors-year {
+  display: block;
+  font-weight: bold;
+  color: #4d616b;
 }
 
 .reveal code.sourceCode:last-child + pre {
diff --git a/inst/reveal.js-5.1.0/dist/theme/ids.css b/inst/reveal.js-5.1.0/dist/theme/ids.css
index b8c44f3..da527dd 100644
--- a/inst/reveal.js-5.1.0/dist/theme/ids.css
+++ b/inst/reveal.js-5.1.0/dist/theme/ids.css
@@ -808,18 +808,21 @@
   text-indent: -22px;
 }
 
-.csl-entry::first-line {
-  color: #253b43;
-}
-
-.csl-entry {
+/* .references scopes this above pandoc's CSL defaults (div.csl-entry), which
+   otherwise win on specificity and pin margin-bottom to 0em. */
+.references .csl-entry {
   color: #888888;
+  margin-bottom: 0.5em;
 }
 
-/* Add line break after authors and year*/
-.csl-entry :first-child::before {
-  content: "\a";
-  white-space: pre;
+/* "Authors (Year):" as a bold dark first line; the theme template's JS wraps
+   the leading text of each entry in .csl-authors-year (see default.html) --
+   which part of an entry citeproc wraps in spans depends on the entry type, so
+   a CSS-only break cannot place it reliably. */
+.csl-entry .csl-authors-year {
+  display: block;
+  font-weight: bold;
+  color: #4d616b;
 }
 
 .reveal code.sourceCode:last-child+pre {