diff --git a/controller/app/src/main/java/org/appdevforall/k2go/redesign/BackupRestoreFragment.java b/controller/app/src/main/java/org/appdevforall/k2go/redesign/BackupRestoreFragment.java
index 6e8240566..01430bbcb 100644
--- a/controller/app/src/main/java/org/appdevforall/k2go/redesign/BackupRestoreFragment.java
+++ b/controller/app/src/main/java/org/appdevforall/k2go/redesign/BackupRestoreFragment.java
@@ -207,15 +207,16 @@ private View hairline() {
 
     /** ADFA-5023: strong confirm before a from-scratch reinstall (wipes everything), then the wizard. */
     private void confirmReinstall() {
-        new com.google.android.material.dialog.MaterialAlertDialogBuilder(requireContext())
+        // K2GO-385: destructive from-scratch reinstall confirm -> the shared BrandDialog (clay destructive).
+        new org.appdevforall.k2go.ui.dialog.BrandDialog(requireContext())
                 .setTitle(R.string.k2go_reinstall_confirm_title)
                 .setMessage(R.string.k2go_reinstall_confirm_msg)
-                .setNegativeButton(android.R.string.cancel, null)
-                .setPositiveButton(R.string.k2go_reinstall_confirm_yes, (d, w) -> {
+                .setDestructive(R.string.k2go_reinstall_confirm_yes, () -> {
                     if (getActivity() instanceof SetupLibraryActivity) {
                         ((SetupLibraryActivity) getActivity()).openReinstallWizard();
                     }
                 })
+                .setNegative(android.R.string.cancel, null)
                 .show();
     }
 
diff --git a/controller/app/src/main/java/org/appdevforall/k2go/redesign/LibraryActivity.java b/controller/app/src/main/java/org/appdevforall/k2go/redesign/LibraryActivity.java
index 5214767d9..9d6852e6f 100644
--- a/controller/app/src/main/java/org/appdevforall/k2go/redesign/LibraryActivity.java
+++ b/controller/app/src/main/java/org/appdevforall/k2go/redesign/LibraryActivity.java
@@ -728,13 +728,14 @@ private void onDownloadToggle() {
      * second copy of it here would be a second place formatting the same fact.
      */
     private void confirmCancelDownload() {
-        new com.google.android.material.dialog.MaterialAlertDialogBuilder(this)
+        // K2GO-385: cancel-the-download confirm -> the shared BrandDialog (destructive: it stops + starts over).
+        new org.appdevforall.k2go.ui.dialog.BrandDialog(this)
                 .setTitle(R.string.k2go_dl_cancel_title)
                 .setMessage(R.string.k2go_dl_cancel_body)
-                .setNegativeButton(R.string.k2go_dl_cancel_keep, null)
-                .setPositiveButton(R.string.k2go_dl_cancel_confirm, (d, w) ->
+                .setDestructive(R.string.k2go_dl_cancel_confirm, () ->
                         sendToInstallService(
                                 org.appdevforall.k2go.install.presentation.InstallService.ACTION_CANCEL))
+                .setNegative(R.string.k2go_dl_cancel_keep, null)
                 .show();
     }
 
diff --git a/controller/app/src/main/java/org/appdevforall/k2go/redesign/SettingsFragment.java b/controller/app/src/main/java/org/appdevforall/k2go/redesign/SettingsFragment.java
index df74be000..1c269e5bc 100644
--- a/controller/app/src/main/java/org/appdevforall/k2go/redesign/SettingsFragment.java
+++ b/controller/app/src/main/java/org/appdevforall/k2go/redesign/SettingsFragment.java
@@ -11,7 +11,6 @@
 import android.widget.TextView;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.app.AppCompatDelegate;
 import androidx.core.content.ContextCompat;
 import androidx.fragment.app.Fragment;
@@ -107,11 +106,17 @@ private void chooseTheme() {
                 AppCompatDelegate.MODE_NIGHT_NO,
                 AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM,
                 AppCompatDelegate.MODE_NIGHT_YES};
-        new AlertDialog.Builder(requireContext())
+        int cur = prefs().getInt("k2go_theme", AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
+        int checked = cur == AppCompatDelegate.MODE_NIGHT_NO ? 0 : (cur == AppCompatDelegate.MODE_NIGHT_YES ? 2 : 1);
+        // K2GO-385 (pill roles Q3): a single-choice list picker -- a themed M3 dialog with a leading
+        // filled radio on the current theme, not a bare setItems list. Tap applies and closes, as before.
+        new com.google.android.material.dialog.MaterialAlertDialogBuilder(
+                new android.view.ContextThemeWrapper(requireContext(), R.style.Theme_K2Go))
                 .setTitle(getString(R.string.k2go_settings_theme))
-                .setItems(labels, (d, w) -> {
+                .setSingleChoiceItems(labels, checked, (d, w) -> {
                     prefs().edit().putInt("k2go_theme", modes[w]).apply();
                     AppCompatDelegate.setDefaultNightMode(modes[w]);
+                    d.dismiss();
                 })
                 .show();
     }
@@ -143,15 +148,16 @@ private void buildFooter(Context ctx, LinearLayout footer) {
     }
 
     private void confirmTurnOff() {
-        new AlertDialog.Builder(requireContext())
-                .setTitle(getString(R.string.k2go_settings_turnoff_title))
-                .setMessage(getString(R.string.k2go_settings_turnoff_msg))
-                .setNegativeButton(getString(R.string.k2go_cancel), null)
-                .setPositiveButton(getString(R.string.k2go_settings_turnoff_confirm), (d, w) -> {
+        // K2GO-385: turn-off confirm -> the shared BrandDialog (destructive, matching the clay "Turn off" button).
+        new org.appdevforall.k2go.ui.dialog.BrandDialog(requireContext())
+                .setTitle(R.string.k2go_settings_turnoff_title)
+                .setMessage(R.string.k2go_settings_turnoff_msg)
+                .setDestructive(R.string.k2go_settings_turnoff_confirm, () -> {
                     if (getActivity() instanceof LibraryActivity) {
                         ((LibraryActivity) getActivity()).turnOffK2Go();
                     }
                 })
+                .setNegative(R.string.k2go_cancel, null)
                 .show();
     }
 
diff --git a/controller/app/src/main/java/org/appdevforall/k2go/redesign/SetupProgressActivity.java b/controller/app/src/main/java/org/appdevforall/k2go/redesign/SetupProgressActivity.java
index 3984f5e82..c4ebde5ec 100644
--- a/controller/app/src/main/java/org/appdevforall/k2go/redesign/SetupProgressActivity.java
+++ b/controller/app/src/main/java/org/appdevforall/k2go/redesign/SetupProgressActivity.java
@@ -1389,13 +1389,14 @@ private void configureDetailBar() {
      * flag and marks the module failed; the base system is untouched and the server restarts.
      */
     private void confirmCancelModule() {
-        new com.google.android.material.dialog.MaterialAlertDialogBuilder(this)
+        // K2GO-385: cancel-running-install confirm -> the shared BrandDialog (destructive).
+        new org.appdevforall.k2go.ui.dialog.BrandDialog(this)
                 .setTitle(R.string.k2go_mod_cancel_title)
                 .setMessage(R.string.k2go_mod_cancel_body)
-                .setNegativeButton(R.string.k2go_mod_cancel_dismiss, null)
-                .setPositiveButton(R.string.k2go_mod_cancel_confirm, (d, w) ->
+                .setDestructive(R.string.k2go_mod_cancel_confirm, () ->
                         startService(new android.content.Intent(this, org.appdevforall.k2go.install.presentation.InstallService.class)
                                 .setAction(org.appdevforall.k2go.install.presentation.InstallService.ACTION_CANCEL)))
+                .setNegative(R.string.k2go_mod_cancel_dismiss, null)
                 .show();
     }
 
diff --git a/controller/app/src/main/res/drawable/ic_language.xml b/controller/app/src/main/res/drawable/ic_language.xml
new file mode 100644
index 000000000..8d572675a
--- /dev/null
+++ b/controller/app/src/main/res/drawable/ic_language.xml
@@ -0,0 +1,7 @@
+<!-- K2GO-385: Material "language" (globe), tinted by the caller (drawableTint teal on the selector). -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp" android:height="24dp"
+    android:viewportWidth="24" android:viewportHeight="24">
+    <path android:fillColor="@android:color/white"
+        android:pathData="M11.99,2C6.47,2 2,6.48 2,12s4.47,10 9.99,10C17.52,22 22,17.52 22,12 22,6.48 17.52,2 11.99,2zM18.92,8h-2.95c-0.32,-1.25 -0.78,-2.45 -1.38,-3.56 1.84,0.63 3.37,1.9 4.33,3.56zM12,4.04c0.83,1.2 1.48,2.53 1.91,3.96h-3.82c0.43,-1.43 1.08,-2.76 1.91,-3.96zM4.26,14C4.1,13.36 4,12.69 4,12s0.1,-1.36 0.26,-2h3.38c-0.08,0.66 -0.14,1.32 -0.14,2 0,0.68 0.06,1.34 0.14,2H4.26zM5.08,16h2.95c0.32,1.25 0.78,2.45 1.38,3.56 -1.84,-0.63 -3.37,-1.9 -4.33,-3.56zM8.03,8H5.08c0.96,-1.65 2.49,-2.93 4.33,-3.56C8.81,5.55 8.35,6.75 8.03,8zM12,19.96c-0.83,-1.2 -1.48,-2.53 -1.91,-3.96h3.82c-0.43,1.43 -1.08,2.76 -1.91,3.96zM14.34,14H9.66c-0.09,-0.66 -0.16,-1.32 -0.16,-2 0,-0.68 0.07,-1.35 0.16,-2h4.68c0.09,0.65 0.16,1.32 0.16,2 0,0.68 -0.07,1.34 -0.16,2zM14.36,19.56c0.6,-1.11 1.06,-2.31 1.38,-3.56h2.95c-0.96,1.65 -2.49,2.93 -4.33,3.56zM16.36,14c0.08,-0.66 0.14,-1.32 0.14,-2 0,-0.68 -0.06,-1.34 -0.14,-2h3.38c0.16,0.64 0.26,1.31 0.26,2s-0.1,1.36 -0.26,2h-3.38z"/>
+</vector>
diff --git a/controller/app/src/main/res/layout/fragment_k2go_books_landing.xml b/controller/app/src/main/res/layout/fragment_k2go_books_landing.xml
index f6c78de6e..ee80484c2 100644
--- a/controller/app/src/main/res/layout/fragment_k2go_books_landing.xml
+++ b/controller/app/src/main/res/layout/fragment_k2go_books_landing.xml
@@ -46,6 +46,9 @@
             android:textColor="@color/k2go_ink"
             android:textColorHint="@color/k2go_muted" />
 
+        <!-- K2GO-385 (pill roles Q3B): the language selector is a dropdown / menu button, not a filter
+             chip. A leading globe and a trailing caret frame the current value, and a tap opens the
+             single-choice picker; no check or selected-fill (that is the chip language). -->
         <TextView
             android:id="@+id/k2go_books_lang"
             android:layout_width="wrap_content"
@@ -56,6 +59,11 @@
             android:paddingTop="8dp"
             android:paddingBottom="8dp"
             android:background="@drawable/k2go_pill_bg"
+            android:drawableStart="@drawable/ic_language"
+            android:drawableEnd="@drawable/ic_expand_more"
+            android:drawableTint="@color/k2go_teal"
+            android:drawablePadding="6dp"
+            android:gravity="center_vertical"
             android:textAppearance="?attr/textAppearanceBodySmall"
             android:textColor="@color/k2go_ink" />
 
diff --git a/controller/app/src/main/res/values/themes_k2go.xml b/controller/app/src/main/res/values/themes_k2go.xml
index a1b91341f..537e81bb0 100644
--- a/controller/app/src/main/res/values/themes_k2go.xml
+++ b/controller/app/src/main/res/values/themes_k2go.xml
@@ -10,6 +10,19 @@
         <item name="android:windowBackground">@color/k2go_paper</item>
         <item name="colorSurface">@color/k2go_paper</item>
         <item name="colorSurfaceContainer">@color/k2go_surface</item>
+        <!-- K2GO-385: define the full surface-container ladder so M3 dialogs and menus take a K2Go
+             surface, not the Material3 baseline lilac. A themed MaterialAlertDialog (e.g. the theme
+             picker) reads colorSurfaceContainerHigh for its card. The tokens carry their own -night
+             twins, so DayNight is handled. -->
+        <item name="colorSurfaceContainerLowest">@color/k2go_paper</item>
+        <item name="colorSurfaceContainerLow">@color/k2go_paper</item>
+        <item name="colorSurfaceContainerHigh">@color/k2go_surface</item>
+        <item name="colorSurfaceContainerHighest">@color/k2go_surface</item>
+        <!-- K2GO-385: interactive controls (the single-choice radio in the theme picker, checkboxes,
+             switches) take K2Go teal, not the Material3 / dynamic default (which read purple). The
+             android-namespace attr is the one the platform radio in setSingleChoiceItems uses. -->
+        <item name="colorControlActivated">@color/k2go_teal</item>
+        <item name="android:colorControlActivated">@color/k2go_teal</item>
         <item name="colorOnBackground">@color/k2go_ink</item>
         <item name="colorOnSurface">@color/k2go_ink</item>
         <item name="colorOnSurfaceVariant">@color/k2go_muted</item>