diff --git a/frontend/src/styles.css b/frontend/src/styles.css
index f8f6bc6..31e669f 100644
--- a/frontend/src/styles.css
+++ b/frontend/src/styles.css
@@ -426,6 +426,12 @@ html[data-theme='cosmic'] .sidebar-logo img {
   filter: invert(1);
 }
 
+/* The logo art is dark ink; on the dark workshop material it inverts to
+   the warm paper ink so the mark stays legible on #12110f. */
+html[data-theme='workshop-dark'] .sidebar-logo img {
+  filter: invert(1) grayscale(1) brightness(1.4);
+}
+
 /* Cosmic workspace - Deep Space background with vignette effect */
 html[data-theme='cosmic'] .app-shell {
   background: