diff --git a/frontend/src/routes/layout.css b/frontend/src/routes/layout.css
index 5e693203..e4d9cce0 100644
--- a/frontend/src/routes/layout.css
+++ b/frontend/src/routes/layout.css
@@ -335,13 +335,17 @@
    Underline at rest is required for WCAG AA — colour alone fails 8% of men
    with red-green colour-blindness. Focus ring uses a box-shadow + border-radius
    so the rectangle doesn't touch the glyphs.
+
+   Underline colour uses --c-ink at 50% so the link affordance is visible on
+   any surface, including sand-tinted backgrounds where the previous mint
+   accent at 60% (~1.6:1 on white — Leonie FINDING-06) was barely perceptible.
 */
 .person-mention {
 	color: var(--c-ink);
 	text-decoration: underline;
 	text-decoration-thickness: 1px;
 	text-underline-offset: 3px;
-	text-decoration-color: color-mix(in srgb, var(--c-accent) 60%, transparent);
+	text-decoration-color: color-mix(in srgb, var(--c-ink) 50%, transparent);
 	cursor: pointer;
 	transition: text-decoration-color 0.15s ease;
 }