diff --git a/CHANGELOG.md b/CHANGELOG.md
index 12f6100..8a0be2f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,13 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
 
 ---
 
+## [1.13.10] — 2026-07-06
+
+### Fixed
+- **"Cast as audiobook" icon was invisible** — a leftover rule colored its icon accent-blue from when the button was still the plain/secondary style; after making it the primary blue button, that same blue-on-blue rendered the icon invisible against the button's own background.
+
+---
+
 ## [1.13.9] — 2026-07-06
 
 ### Changed
diff --git a/VERSION b/VERSION
index 084f226..f3352b3 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.13.9
+1.13.10
diff --git a/static/index.html b/static/index.html
index d443480..07de5bf 100644
--- a/static/index.html
+++ b/static/index.html
@@ -10,7 +10,7 @@
   <meta name="format-detection" content="telephone=no">
   <meta name="color-scheme" content="light dark">
   <meta name="theme-color" content="#2563EB">
-  <meta name="app-version" content="1.13.9">
+  <meta name="app-version" content="1.13.10">
   <link rel="manifest" href="/manifest.webmanifest">
   <link rel="icon" href="/static/icon.svg" type="image/svg+xml">
   <link rel="apple-touch-icon" href="/static/icon.svg">
@@ -27,7 +27,7 @@
 
   <!-- ── Core styles (local — no CDN dependency for first paint) ────────── -->
   <link rel="stylesheet" href="/static/vendor/mdi/materialdesignicons.min.css">
-  <link rel="stylesheet" href="/static/style.css?v=1.13.9">
+  <link rel="stylesheet" href="/static/style.css?v=1.13.10">
 
 
   <!-- ── Flag icons — non-blocking (loaded async, icons appear after JS) ── -->
@@ -365,7 +365,7 @@ window.toggleNavTree = function(treeId, chevronId) {
 </script>
 
 <!-- loader.js: fetches sections → loads JS modules → removes skeleton -->
-<script src="/static/loader.js?v=1.13.9"></script>
+<script src="/static/loader.js?v=1.13.10"></script>
 
 </body>
 </html>
diff --git a/static/style.css b/static/style.css
index 2b46245..6922e3f 100644
--- a/static/style.css
+++ b/static/style.css
@@ -5087,7 +5087,6 @@ code { background: var(--panel); border-radius: 4px; padding: 1px 5px; font-fami
 .reader-sel-hint { font-size: 12px; color: var(--subtext); }
 .reader-sel-hint b { color: var(--accent); }
 .reader-export { display: inline-flex; align-items: center; gap: 6px; }
-#reader-audiobook-btn .mdi { color: var(--accent); }
 
 /* Audiobook live casting — floating, non-blocking, minimisable panel */
 .ab-castpanel {