diff --git a/frontend/src/App.css b/frontend/src/App.css
index aa9d2df..f60c87b 100644
--- a/frontend/src/App.css
+++ b/frontend/src/App.css
@@ -2111,7 +2111,7 @@ a.app-footer__repo:hover {
 /* ── Table of Contents ────────────────────────────────────────────────────── */
 
 .technique-toc {
-  border-left: 2px solid #a855f7;
+  border-left: 2px solid var(--color-accent);
   padding: 0 0 0 1rem;
   margin-bottom: 1.5rem;
 }