diff --git a/crates/design/src/color/state.rs b/crates/design/src/color/state.rs
index 8130105..3791046 100644
--- a/crates/design/src/color/state.rs
+++ b/crates/design/src/color/state.rs
@@ -127,4 +127,33 @@ mod tests {
         assert!(ratio > 1.5, "禁用态对比度过低：{ratio}");
         assert!(ratio < 4.5, "禁用态不该和正文一样醒目：{ratio}");
     }
+
+    /// 两族 α 的**令牌层钉值**（M86）：期望值硬编码，不从被测常量取——否则改坏常量也照样绿。
+    ///
+    /// 出处（AAR `material3-android-1.4.0` 的 `<clinit>`）：
+    /// `*ButtonTokens.DisabledContainerOpacity = 0.1f`（按钮族）与
+    /// `AssistChipTokens.FlatDisabledOutlineOpacity` / `SliderTokens.DisabledInactiveTrackOpacity` /
+    /// `SwitchTokens.DisabledTrackOpacity = 0.12f`（面状控件族）。
+    #[test]
+    fn disabled_alpha_classes_are_pinned_at_the_token_layer() {
+        const EXPECTED_BUTTON: f32 = 0.10;
+        const EXPECTED_SURFACE: f32 = 0.12;
+        const EXPECTED_CONTENT: f32 = 0.38;
+        let button = DISABLED_CONTAINER_ALPHA;
+        let surface = DISABLED_SURFACE_ALPHA;
+        let content = DISABLED_CONTENT_ALPHA;
+        assert_eq!(
+            button, EXPECTED_BUTTON,
+            "按钮族禁用容器 α 必须是官方 0.1f（*ButtonTokens.DisabledContainerOpacity）"
+        );
+        assert_eq!(
+            surface, EXPECTED_SURFACE,
+            "面状控件族 α 必须是官方 0.12f（chip 描边 / slider 轨道 / switch 轨道）"
+        );
+        assert_eq!(content, EXPECTED_CONTENT, "禁用内容 0.38f");
+        assert!(
+            surface > button,
+            "两族必须可区分（{surface} > {button}）；合成一个数就是 M86 要防的回归"
+        );
+    }
 }