diff --git a/theme.css b/theme.css
index 1009ffd..b79353c 100644
--- a/theme.css
+++ b/theme.css
@@ -88,6 +88,17 @@
     --chart-4: oklch(0.72 0.2 350);
     --chart-5: oklch(0.5 0.18 150);
 
+    /* Text drawn ON a chart tint — a filled avatar, a category pill, a bar
+     * label. A palette is tuned so the series stay distinguishable from each
+     * other, which says nothing about whether white sits on them: of these
+     * five, white clears AA on two. Each tint therefore names its own
+     * foreground, measured (worst pair 5.32:1). */
+    --chart-1-foreground: oklch(1 0 0);
+    --chart-2-foreground: oklch(0.16 0.03 295);
+    --chart-3-foreground: oklch(0.16 0.03 295);
+    --chart-4-foreground: oklch(0.16 0.03 295);
+    --chart-5-foreground: oklch(1 0 0);
+
     --sidebar: oklch(1 0 0 / 0.5);
     --sidebar-foreground: oklch(0.16 0.025 285);
     --sidebar-primary: oklch(0.55 0.22 295);
@@ -234,6 +245,15 @@
     --chart-4: oklch(0.82 0.2 350);
     --chart-5: oklch(0.6 0.18 150);
 
+    /* Dark lifts every tint to stay visible against the dark ground, which
+     * puts all five out of reach of white — including chart-1 at 3.36:1,
+     * the assistant avatar in a chat transcript. */
+    --chart-1-foreground: oklch(0.16 0.03 295);
+    --chart-2-foreground: oklch(0.16 0.03 295);
+    --chart-3-foreground: oklch(0.16 0.03 295);
+    --chart-4-foreground: oklch(0.16 0.03 295);
+    --chart-5-foreground: oklch(0.16 0.03 295);
+
     --sidebar: oklch(0.2 0.04 290 / 0.55);
     --sidebar-foreground: oklch(0.97 0.005 280);
     --sidebar-primary: oklch(0.7 0.2 295);