diff --git a/src/AcDream.App/UI/Layout/VitalsController.cs b/src/AcDream.App/UI/Layout/VitalsController.cs
index a455761a..c570fb34 100644
--- a/src/AcDream.App/UI/Layout/VitalsController.cs
+++ b/src/AcDream.App/UI/Layout/VitalsController.cs
@@ -12,6 +12,10 @@ namespace AcDream.App.UI.Layout;
 /// <para>The slice sprites + dat font on each <see cref="UiMeter"/> are already
 /// set by <see cref="DatWidgetFactory"/> during tree construction; this controller
 /// only binds the dynamic vitals data. Do not touch meter rendering fields here.</para>
+///
+/// <para>Element ids confirmed from
+/// <c>docs/research/2026-06-15-layoutdesc-format.md §11</c>
+/// (vitals window 0x2100006C dump).</para>
 /// </summary>
 public static class VitalsController
 {
diff --git a/tests/AcDream.App.Tests/UI/Layout/VitalsBindingTests.cs b/tests/AcDream.App.Tests/UI/Layout/VitalsBindingTests.cs
index 8b430265..133d51ca 100644
--- a/tests/AcDream.App.Tests/UI/Layout/VitalsBindingTests.cs
+++ b/tests/AcDream.App.Tests/UI/Layout/VitalsBindingTests.cs
@@ -16,7 +16,7 @@ public class VitalsBindingTests
     public void Bind_SetsHealthMeterFillFromProvider()
     {
         var health = new UiMeter();
-        var layout = FakeLayout(("0x100000E6", health));
+        var layout = FakeLayout((VitalsController.Health, health));
         float hp = 0.42f;
 
         VitalsController.Bind(layout,
@@ -40,9 +40,9 @@ public class VitalsBindingTests
         var stamina = new UiMeter();
         var mana    = new UiMeter();
         var layout  = FakeLayout(
-            ("0x100000E6", health),
-            ("0x100000EC", stamina),
-            ("0x100000EE", mana));
+            (VitalsController.Health,  health),
+            (VitalsController.Stamina, stamina),
+            (VitalsController.Mana,    mana));
 
         VitalsController.Bind(layout,
             healthPct:   () => 0.25f,
@@ -70,7 +70,7 @@ public class VitalsBindingTests
     {
         // Only Health is present; Stamina and Mana are absent from the layout.
         var health = new UiMeter();
-        var layout = FakeLayout(("0x100000E6", health));
+        var layout = FakeLayout((VitalsController.Health, health));
 
         // Should not throw even though Stamina/Mana are missing.
         VitalsController.Bind(layout,
@@ -87,13 +87,12 @@ public class VitalsBindingTests
 
     // ── Helpers ───────────────────────────────────────────────────────────────
 
-    private static ImportedLayout FakeLayout(params (string idHex, UiElement e)[] items)
+    private static ImportedLayout FakeLayout(params (uint id, UiElement e)[] items)
     {
         var dict = new Dictionary<uint, UiElement>();
         var root = new UiPanel();
-        foreach (var (idHex, e) in items)
+        foreach (var (id, e) in items)
         {
-            uint id = Convert.ToUInt32(idHex, 16);
             root.AddChild(e);
             dict[id] = e;
         }