diff --git a/src/ClaudeDo.Ui/Design/Tokens.axaml b/src/ClaudeDo.Ui/Design/Tokens.axaml
index e707f082..f5b5ece1 100644
--- a/src/ClaudeDo.Ui/Design/Tokens.axaml
+++ b/src/ClaudeDo.Ui/Design/Tokens.axaml
@@ -111,6 +111,14 @@
   <SolidColorBrush x:Key="MergeResolvedEdgeBrush" Color="#806FA86B" /> <!-- resolved conflict map tick -->
   <SolidColorBrush x:Key="AmberBrush"             Color="#FFD4A574" /> <!-- solid amber (theirs label) -->
 
+  <!-- Diff viewer: filler/gap rows and intra-line (word) highlighting.
+       Whole-line add/delete tints reuse RunningTintBrush / ErrorTintBrush, which are low
+       enough alpha that syntax-highlighted text stays legible on top of them. -->
+  <SolidColorBrush x:Key="DiffFillerBrush"  Color="#0AFFFFFF" /> <!-- "no line on this side" -->
+  <SolidColorBrush x:Key="DiffGapBrush"     Color="#14FFFFFF" /> <!-- skipped region between hunks -->
+  <SolidColorBrush x:Key="DiffWordAddBrush" Color="#556FA86B" /> <!-- changed words, new side -->
+  <SolidColorBrush x:Key="DiffWordDelBrush" Color="#55C87060" /> <!-- changed words, old side -->
+
   <!-- Window-body gradient layers (apply as LinearGradientBrush in the main content Border) -->
   <LinearGradientBrush x:Key="DesktopBackgroundBrush" StartPoint="0%,0%" EndPoint="0%,100%">
     <GradientStop Offset="0"   Color="#FF05070A" />