diff --git a/plugins/media-bar.css b/plugins/media-bar.css
index a0e5e81..3b30e96 100644
--- a/plugins/media-bar.css
+++ b/plugins/media-bar.css
@@ -1,3 +1,12 @@
+:root {
+    /* Primary accent colour — used for highlights, active states, progress bars.
+       Format: R, G, B (no rgb() wrapper) so opacity variants work cleanly. */
+    --abyss-accent: 245, 245, 247;
+
+    /* Corner rounding applied globally */
+    --abyss-radius: 12px;
+}
+
 /* =============== Detail Bar =============== */
 
 .slide.active .button-container {