diff --git a/examples/reflex/reflex_xy_app/reflex_xy_app.py b/examples/reflex/reflex_xy_app/reflex_xy_app.py
index 36598dc1..d4de5a93 100644
--- a/examples/reflex/reflex_xy_app/reflex_xy_app.py
+++ b/examples/reflex/reflex_xy_app/reflex_xy_app.py
@@ -38,9 +38,9 @@
 }
 
 CUSTOM_CHROME_SEGMENTS = [
-    {"label": "Enterprise", "color": "#4c78a8"},
-    {"label": "Growth", "color": "#f58518"},
-    {"label": "Self serve", "color": "#54a24b"},
+    {"label": "Enterprise", "color": "#3987e5"},
+    {"label": "Growth", "color": "#008300"},
+    {"label": "Self serve", "color": "#d55181"},
 ]
 
 ANNOTATED_HEATMAP_MARKERS = [
@@ -247,9 +247,9 @@
 def my_legend():
     return rx.box(
         rx.text("Segment"),
-        rx.hstack(rx.box(background="#4c78a8"), rx.text("Enterprise")),
-        rx.hstack(rx.box(background="#f58518"), rx.text("Growth")),
-        rx.hstack(rx.box(background="#54a24b"), rx.text("Self serve")),
+        rx.hstack(rx.box(background="#3987e5"), rx.text("Enterprise")),
+        rx.hstack(rx.box(background="#008300"), rx.text("Growth")),
+        rx.hstack(rx.box(background="#d55181"), rx.text("Self serve")),
     )
 
 def my_tooltip():
diff --git a/python/xy/config.py b/python/xy/config.py
index 7e629f0c..509a2081 100644
--- a/python/xy/config.py
+++ b/python/xy/config.py
@@ -56,18 +56,26 @@
 DENSITY_SAMPLE_TARGET = 8_192
 DENSITY_SAMPLE_SEED = 0
 
-# CVD-safe default categorical palette (§20/§36 default theme).
+# CVD-safe default categorical palette (§20/§36 default theme). Eight slots in
+# a fixed order; charts render on unknown host surfaces, so every step sits in
+# the OKLCH lightness band both light and dark modes share (L 0.48–0.67) and is
+# validated against both reference surfaces (#fcfcfb / #1a1a19) with
+# .claude/skills/xy-dataviz/scripts/validate_palette.py: chroma ≥ 0.10, worst
+# adjacent-pair CVD ΔE 8.5 (Machado–Oliveira–Fernandes protan/deutan, ≥8
+# target), worst adjacent normal-vision ΔE 19.1 (≥15 floor), all slots ≥3:1 on
+# both surfaces. The ORDER is the CVD-safety mechanism — adjacency drives the
+# ΔE gate — so never re-order or extend without re-running the validator.
+# (Replaced Tableau10, whose adjacent red/green collapsed to ΔE 1.2 under
+# deuteranopia and whose slots 1/5/7/9/10 sat below the chroma floor.)
 DEFAULT_PALETTE = [
-    "#4c78a8",
-    "#f58518",
-    "#54a24b",
-    "#e45756",
-    "#72b7b2",
-    "#eeca3b",
-    "#b279a2",
-    "#ff9da6",
-    "#9d755d",
-    "#bab0ac",
+    "#3987e5",  # blue
+    "#008300",  # green
+    "#d55181",  # magenta
+    "#c48300",  # amber
+    "#199e70",  # aqua
+    "#d95926",  # orange
+    "#9085e9",  # violet
+    "#e66767",  # red
 ]
 
 # Tile pyramid (§5 Tier 3): built lazily per density trace at/above this size;
diff --git a/scripts/visual_regression_smoke.py b/scripts/visual_regression_smoke.py
index ede4d78d..c6793c45 100644
--- a/scripts/visual_regression_smoke.py
+++ b/scripts/visual_regression_smoke.py
@@ -780,9 +780,9 @@ def _write_chrome_shell(
     <iframe id="custom-chrome-frame" src="{chart_uri}" title="Custom chrome chart"></iframe>
     <aside id="custom-chrome-legend" class="custom-chrome-legend">
       <strong>Segment</strong>
-      <span><i style="background:#4c78a8"></i> Enterprise</span>
-      <span><i style="background:#f58518"></i> Growth</span>
-      <span><i style="background:#54a24b"></i> Self serve</span>
+      <span><i style="background:#3987e5"></i> Enterprise</span>
+      <span><i style="background:#008300"></i> Growth</span>
+      <span><i style="background:#d55181"></i> Self serve</span>
     </aside>
     <div id="custom-chrome-tooltip" class="custom-chrome-tooltip">
       <strong id="custom-chrome-tooltip-title">Growth</strong>