diff --git a/web/hwlab-cloud-web/src/components/layout/SplitWorkspaceLayout.vue b/web/hwlab-cloud-web/src/components/layout/SplitWorkspaceLayout.vue
index bfdcf9f9..c6eacd7c 100644
--- a/web/hwlab-cloud-web/src/components/layout/SplitWorkspaceLayout.vue
+++ b/web/hwlab-cloud-web/src/components/layout/SplitWorkspaceLayout.vue
@@ -49,18 +49,17 @@ const clampedLeftWidth = computed(() => clamp(props.leftWidth, props.minLeftWidt
 const clampedRightWidth = computed(() => clamp(props.rightWidth, props.minRightWidth, props.maxRightWidth));
 
 const layoutStyle = computed(() => {
-  const leftColumn = props.leftCollapsed
-    ? `${props.leftCollapsedWidth}px`
+  const leftCol = props.leftCollapsed
+    ? '0px'
     : `minmax(${props.leftCollapsedWidth}px, ${clampedLeftWidth.value}%)`;
+  const leftResizerCol = props.leftCollapsed ? '0px' : '6px';
   if (!props.rightOpen) {
-    const leftCol = props.leftCollapsed ? '0px' : leftColumn;
-    const resizerCol = props.leftCollapsed ? '0px' : '6px';
-    return { gridTemplateColumns: `${leftCol} ${resizerCol} minmax(0, 1fr)` };
+    return { gridTemplateColumns: `${leftCol} ${leftResizerCol} minmax(0, 1fr)` };
   }
   const mainShare = props.rightCollapsed ? "minmax(0, 1fr)" : `minmax(0, ${100 - clampedRightWidth.value}fr)`;
   const rightResizeColumn = props.rightCollapsed ? "0" : "6px";
   const rightColumn = props.rightCollapsed ? "0px" : `minmax(280px, ${clampedRightWidth.value}fr)`;
-  return { gridTemplateColumns: `${leftColumn} 6px ${mainShare} ${rightResizeColumn} ${rightColumn}` };
+  return { gridTemplateColumns: `${leftCol} ${leftResizerCol} ${mainShare} ${rightResizeColumn} ${rightColumn}` };
 });
 
 onBeforeUnmount(() => stopResize());
@@ -109,12 +108,9 @@ function clamp(value: number, min: number, max: number): number {
     :data-right-collapsed="rightCollapsed"
     :data-resizing="resizing || undefined"
   >
-    <aside v-if="!leftCollapsed" class="split-workspace-pane split-workspace-left" :data-collapsed="leftCollapsed">
+    <aside class="split-workspace-pane split-workspace-left" :data-collapsed="leftCollapsed">
       <slot name="left" />
     </aside>
-    <button v-if="leftCollapsed" class="split-workspace-toggle split-workspace-toggle-left" type="button" aria-label="展开左侧面板" @click="$emit('update:leftCollapsed', false)">
-      <slot name="left-toggle">›</slot>
-    </button>
     <div
       class="split-workspace-resizer split-workspace-resizer-left"
       :data-testid="leftResizerTestId"
@@ -135,12 +131,9 @@ function clamp(value: number, min: number, max: number): number {
       :aria-valuenow="Math.round(clampedRightWidth)"
       @pointerdown="startResize('right', $event)"
     />
-    <aside v-if="rightOpen && !rightCollapsed" class="split-workspace-pane split-workspace-right" :data-collapsed="rightCollapsed">
+    <aside v-if="rightOpen" class="split-workspace-pane split-workspace-right" :data-collapsed="rightCollapsed">
       <slot name="right" />
     </aside>
-    <button v-if="rightOpen && rightCollapsed" class="split-workspace-toggle split-workspace-toggle-right" type="button" aria-label="展开右侧面板" @click="$emit('update:rightCollapsed', false)">
-      <slot name="right-toggle">‹</slot>
-    </button>
   </section>
 </template>
 
@@ -192,6 +185,11 @@ function clamp(value: number, min: number, max: number): number {
   display: none;
 }
 
+.split-workspace-left[data-collapsed="true"],
+.split-workspace-right[data-collapsed="true"] {
+  overflow: hidden;
+}
+
 .split-workspace-layout[data-resizing] {
   user-select: none;
 }
@@ -212,11 +210,6 @@ function clamp(value: number, min: number, max: number): number {
   align-self: stretch;
 }
 
-.split-workspace-toggle { display: inline-flex; width: 28px; height: 100%; align-items: center; justify-content: center; border: 1px solid #d8e1e7; border-radius: 0; background: #f8fafb; color: #5d6a73; cursor: pointer; font-size: 16px; font-weight: 850; }
-.split-workspace-toggle:hover { background: #eef2f5; color: #111827; }
-.split-workspace-toggle-left { border-right: 0; }
-.split-workspace-toggle-right { border-left: 0; }
-
 @media (max-width: 720px) {
   .split-workspace-layout {
     display: grid;
diff --git a/web/hwlab-cloud-web/src/components/mdtodo/MdtodoPageShell.vue b/web/hwlab-cloud-web/src/components/mdtodo/MdtodoPageShell.vue
index 83880d3b..138cf32d 100644
--- a/web/hwlab-cloud-web/src/components/mdtodo/MdtodoPageShell.vue
+++ b/web/hwlab-cloud-web/src/components/mdtodo/MdtodoPageShell.vue
@@ -526,6 +526,16 @@ function setError(err: unknown): void {
         <p v-if="source.sourceError.value" class="source-error" data-testid="mdtodo-source-error">{{ source.sourceError.value }}</p>
       </div>
 
+      <div class="mdtodo-toggle-bar">
+        <button class="mdtodo-toggle-btn mdtodo-toggle-left" type="button" :data-testid="taskPaneCollapsed ? 'mdtodo-expand-left' : 'mdtodo-collapse-left'" :aria-label="taskPaneCollapsed ? '展开左侧面板' : '收起左侧面板'" @click="taskPaneCollapsed = !taskPaneCollapsed">
+          {{ taskPaneCollapsed ? '▶' : '◀' }}
+        </button>
+        <span class="mdtodo-toggle-spacer" />
+        <button v-if="reportPaneOpen" class="mdtodo-toggle-btn mdtodo-toggle-right" type="button" :data-testid="reportPaneCollapsed ? 'mdtodo-expand-right' : 'mdtodo-collapse-right'" :aria-label="reportPaneCollapsed ? '展开右侧面板' : '收起右侧面板'" @click="reportPaneCollapsed = !reportPaneCollapsed">
+          {{ reportPaneCollapsed ? '◀' : '▶' }}
+        </button>
+      </div>
+
       <SplitWorkspaceLayout
         v-model:left-width="taskPaneWidth"
         v-model:right-width="reportPaneWidth"
@@ -686,4 +696,10 @@ function setError(err: unknown): void {
 .source-error { border: 1px solid #fecaca; background: #fef2f2; color: #991b1b; }
 .mdtodo-workspace { grid-row: 3; min-height: 0; height: 100%; max-height: none; align-self: stretch; }
 .mdtodo-error { display: grid; align-content: start; gap: 12px; padding: 12px; overflow: auto; }
+
+.mdtodo-toggle-bar { display: flex; align-items: center; gap: 4px; min-width: 0; border-bottom: 1px solid #d8e1e7; background: #f8fafb; padding: 2px 8px; }
+.mdtodo-toggle-btn { display: inline-flex; width: 26px; height: 26px; align-items: center; justify-content: center; border: 1px solid #cbd6dd; border-radius: 4px; background: #fff; color: #5d6a73; cursor: pointer; font-size: 11px; font-weight: 850; line-height: 1; }
+.mdtodo-toggle-btn:hover { background: #eef2f5; color: #111827; border-color: #a7b8c4; }
+.mdtodo-toggle-spacer { flex: 1; min-width: 0; }
+
 </style>
diff --git a/web/hwlab-cloud-web/src/components/mdtodo/MdtodoTaskTree.vue b/web/hwlab-cloud-web/src/components/mdtodo/MdtodoTaskTree.vue
index c1ac62ec..92c3422c 100644
--- a/web/hwlab-cloud-web/src/components/mdtodo/MdtodoTaskTree.vue
+++ b/web/hwlab-cloud-web/src/components/mdtodo/MdtodoTaskTree.vue
@@ -62,7 +62,6 @@ function toggleTask(task: MdtodoTaskRecord): void {
           <span v-if="!collapsed">同步中</span>
         </span>
         <button class="icon-button" type="button" data-testid="mdtodo-new-task-open" aria-label="新建任务" @click="emit('openCreateTask')">+</button>
-        <button class="icon-button" type="button" data-testid="mdtodo-task-pane-toggle" :aria-label="collapsed ? '展开任务树' : '收起任务树'" @click="emit('update:collapsed', !collapsed)">{{ collapsed ? '›' : '‹' }}</button>
       </div>
     </header>
     <template v-if="!collapsed">