diff --git a/src/AcDream.App/UI/MarkupDocument.cs b/src/AcDream.App/UI/MarkupDocument.cs
index d4b0cb42..e27cd294 100644
--- a/src/AcDream.App/UI/MarkupDocument.cs
+++ b/src/AcDream.App/UI/MarkupDocument.cs
@@ -34,6 +34,14 @@ public static class MarkupDocument
             Height = F(root, "h"),
         };
 
+        // Optional per-window resize-axis lock: resize="x" | "y" | "both" | "none".
+        string? resize = (string?)root.Attribute("resize");
+        if (resize is not null)
+        {
+            panel.ResizeX = resize is "x" or "both";
+            panel.ResizeY = resize is "y" or "both";
+        }
+
         string? title = (string?)root.Attribute("title");
         if (!string.IsNullOrEmpty(title))
         {
diff --git a/src/AcDream.App/UI/UiElement.cs b/src/AcDream.App/UI/UiElement.cs
index 30c4b260..48e1955b 100644
--- a/src/AcDream.App/UI/UiElement.cs
+++ b/src/AcDream.App/UI/UiElement.cs
@@ -101,6 +101,11 @@ public abstract class UiElement
     public float MinWidth { get; set; } = 40f;
     public float MinHeight { get; set; } = 40f;
 
+    /// <summary>Allow horizontal (width) resize. Ignored unless <see cref="Resizable"/>.</summary>
+    public bool ResizeX { get; set; } = true;
+    /// <summary>Allow vertical (height) resize. Ignored unless <see cref="Resizable"/>.</summary>
+    public bool ResizeY { get; set; } = true;
+
     // ── Tree structure ──────────────────────────────────────────────────
     public UiElement? Parent { get; private set; }
 
diff --git a/src/AcDream.App/UI/UiRoot.cs b/src/AcDream.App/UI/UiRoot.cs
index 1b72ec9f..6f836253 100644
--- a/src/AcDream.App/UI/UiRoot.cs
+++ b/src/AcDream.App/UI/UiRoot.cs
@@ -542,6 +542,8 @@ public sealed class UiRoot : UiElement
         if (System.Math.Abs(x - r) <= grip) e |= ResizeEdges.Right;
         if (System.Math.Abs(y - t) <= grip) e |= ResizeEdges.Top;
         if (System.Math.Abs(y - b) <= grip) e |= ResizeEdges.Bottom;
+        if (!w.ResizeX) e &= ~(ResizeEdges.Left | ResizeEdges.Right);
+        if (!w.ResizeY) e &= ~(ResizeEdges.Top | ResizeEdges.Bottom);
         return e;
     }
 
diff --git a/src/AcDream.App/UI/assets/vitals.xml b/src/AcDream.App/UI/assets/vitals.xml
index 868926d4..83d59c3b 100644
--- a/src/AcDream.App/UI/assets/vitals.xml
+++ b/src/AcDream.App/UI/assets/vitals.xml
@@ -1,4 +1,4 @@
-<panel id="acdream.vitals" x="10" y="30" w="220" h="96" title="Vitals">
+<panel id="acdream.vitals" x="10" y="30" w="220" h="96" title="Vitals" resize="x">
   <meter id="health"  x="8" y="24" w="200" h="14" fill="{HealthPercent}"  cur="{HealthCurrent}"  max="{HealthMax}"  color="#FFC70D0D"/>
   <meter id="stamina" x="8" y="44" w="200" h="14" fill="{StaminaPercent}" cur="{StaminaCurrent}" max="{StaminaMax}" color="#FFD49E1F"/>
   <meter id="mana"    x="8" y="64" w="200" h="14" fill="{ManaPercent}"    cur="{ManaCurrent}"    max="{ManaMax}"    color="#FF1F33D9"/>
diff --git a/tests/AcDream.App.Tests/UI/MarkupDocumentTests.cs b/tests/AcDream.App.Tests/UI/MarkupDocumentTests.cs
index 8ba52d27..5e76ab95 100644
--- a/tests/AcDream.App.Tests/UI/MarkupDocumentTests.cs
+++ b/tests/AcDream.App.Tests/UI/MarkupDocumentTests.cs
@@ -47,4 +47,13 @@ public class MarkupDocumentTests
         Assert.Null(meter.Fill());
         Assert.Null(meter.Label());
     }
+
+    [Fact]
+    public void Build_ResizeAttrX_SetsHorizontalOnly()
+    {
+        const string xml = "<panel id=\"v\" x=\"0\" y=\"0\" w=\"100\" h=\"50\" title=\"V\" resize=\"x\"></panel>";
+        var panel = MarkupDocument.Build(xml, new object(), _ => ((uint)1, 32, 32));
+        Assert.True(panel.ResizeX);
+        Assert.False(panel.ResizeY);
+    }
 }
diff --git a/tests/AcDream.App.Tests/UI/UiRootInputTests.cs b/tests/AcDream.App.Tests/UI/UiRootInputTests.cs
index 6ea9e317..9ba7dae5 100644
--- a/tests/AcDream.App.Tests/UI/UiRootInputTests.cs
+++ b/tests/AcDream.App.Tests/UI/UiRootInputTests.cs
@@ -102,4 +102,14 @@ public class UiRootInputTests
         Assert.Equal(120f, panel.Top);
         root.OnMouseUp(UiMouseButton.Left, 220, 170);
     }
+
+    [Fact]
+    public void HitEdges_RespectsResizeAxisLock()
+    {
+        var panel = new UiPanel { Left = 100, Top = 100, Width = 200, Height = 100, ResizeY = false };
+        // right edge still detected (X allowed)
+        Assert.True((UiRoot.HitEdges(panel, 300, 150, 5) & ResizeEdges.Right) != 0);
+        // bottom edge masked out (Y locked)
+        Assert.True((UiRoot.HitEdges(panel, 200, 200, 5) & ResizeEdges.Bottom) == 0);
+    }
 }