diff --git a/src/app.css b/src/app.css
index 1099039..38de959 100644
--- a/src/app.css
+++ b/src/app.css
@@ -219,6 +219,24 @@
   color: #ff0000;
 }
 
+/* ── Dan Mode banner ───────────────────────────────────────────────────────── */
+.dan-banner {
+  background-color: #ff0000;
+  color: #ffff00;
+  text-align: center;
+  font-weight: 900;
+  font-size: 1.2rem;
+  letter-spacing: 0.2em;
+  padding: 0.5rem 1rem;
+  border-bottom: 3px solid #ffff00;
+  animation: dan-blink 0.6s step-start infinite;
+}
+
+@keyframes dan-blink {
+  0%, 100% { opacity: 1; }
+  50%       { opacity: 0; }
+}
+
 /* ── Results grid ──────────────────────────────────────────────────────────── */
 .results-grid {
   display: grid;
diff --git a/src/routes/+layout.svelte b/src/routes/+layout.svelte
index 28d2bd3..4b50f94 100644
--- a/src/routes/+layout.svelte
+++ b/src/routes/+layout.svelte
@@ -48,6 +48,10 @@
   </nav>
 </header>
 
+{#if theme === 'dan'}
+  <div class="dan-banner" aria-live="assertive">⚠ DAN MODE ACTIVATED ⚠</div>
+{/if}
+
 <main class="container">
   {@render children()}
 </main>