diff --git a/.changeset/fix-web-sidebar-resize-handle.md b/.changeset/fix-web-sidebar-resize-handle.md
new file mode 100644
index 00000000000..fac669a52cd
--- /dev/null
+++ b/.changeset/fix-web-sidebar-resize-handle.md
@@ -0,0 +1,5 @@
+---
+"@moonshot-ai/kimi-code": patch
+---
+
+web: Fix the sidebar resize handle being covered by the chat composer background.
diff --git a/apps/kimi-web/src/components/ResizeHandle.vue b/apps/kimi-web/src/components/ResizeHandle.vue
index b37a8c24605..c2887ad2fc1 100644
--- a/apps/kimi-web/src/components/ResizeHandle.vue
+++ b/apps/kimi-web/src/components/ResizeHandle.vue
@@ -69,7 +69,9 @@ watch(dragging, (d) => emit('update:dragging', d));
   touch-action: none;
   /* sits over the 1px column border so the whole 4px strip is grabbable */
   margin: 0 -2px;
-  z-index: var(--z-sticky);
+  /* above pane-level sticky chrome (chat dock, headers at --z-sticky): its 2px
+     overhang into the neighbour pane must stay visible and grabbable */
+  z-index: var(--z-dropdown);
 }
 .rh-bar {
   position: absolute;
diff --git a/apps/kimi-web/src/views/DesignSystemView.vue b/apps/kimi-web/src/views/DesignSystemView.vue
index 16fde8bdc00..0ae98978610 100644
--- a/apps/kimi-web/src/views/DesignSystemView.vue
+++ b/apps/kimi-web/src/views/DesignSystemView.vue
@@ -1449,7 +1449,7 @@ onUnmounted(() => {
               <tbody>
                 <tr><td>Width / cursor</td><td>4px / <code>col-resize</code></td></tr>
                 <tr><td>Normal / active</td><td>transparent / <code>accent</code> fill</td></tr>
-                <tr><td>Layer</td><td><code>--z-sticky</code>, over the column border</td></tr>
+                <tr><td>Layer</td><td><code>--z-dropdown</code>, above pane-level sticky chrome (chat dock at <code>--z-sticky</code>) so the overhang stays visible and grabbable</td></tr>
                 <tr><td>Behavior</td><td>panel width follows the pointer 1:1 while dragging (the parent disables transitions to avoid lag); on release it is persisted to localStorage</td></tr>
               </tbody>
             </table>