diff --git a/internal/web/templates/layout.html b/internal/web/templates/layout.html
index a958df9..aaf33db 100644
--- a/internal/web/templates/layout.html
+++ b/internal/web/templates/layout.html
@@ -3,9 +3,10 @@
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <link rel="stylesheet" href="/static/app.css">
 <script>
-// preset preview hook (#16): ?theme=<name> sets data-preset for screenshots only
+// preset hook (#16): ?theme= wins; else persisted choice (#100)
 (function () {
   var t = new URLSearchParams(location.search).get('theme');
+  if (!t) try { t = localStorage.getItem('palette-theme'); } catch (e) {}
   if (t) document.documentElement.dataset.preset = t;
 })();
 </script>