diff --git a/web/hwlab-cloud-web/src/components/layout/SplitWorkspaceLayout.vue b/web/hwlab-cloud-web/src/components/layout/SplitWorkspaceLayout.vue
new file mode 100644
index 00000000..9ccdb315
--- /dev/null
+++ b/web/hwlab-cloud-web/src/components/layout/SplitWorkspaceLayout.vue
@@ -0,0 +1,190 @@
+<!-- Responsibility: Generic bounded split workspace layout for tool pages. -->
+
+<script setup lang="ts">
+import { computed, onBeforeUnmount, ref } from "vue";
+
+const props = withDefaults(defineProps<{
+  leftCollapsed?: boolean;
+  rightOpen?: boolean;
+  rightCollapsed?: boolean;
+  leftWidth?: number;
+  rightWidth?: number;
+  minLeftWidth?: number;
+  maxLeftWidth?: number;
+  minRightWidth?: number;
+  maxRightWidth?: number;
+  leftCollapsedWidth?: number;
+  rightCollapsedWidth?: number;
+  leftResizerTestId?: string;
+  rightResizerTestId?: string;
+  ariaLabel?: string;
+}>(), {
+  leftCollapsed: false,
+  rightOpen: false,
+  rightCollapsed: false,
+  leftWidth: 30,
+  rightWidth: 50,
+  minLeftWidth: 18,
+  maxLeftWidth: 36,
+  minRightWidth: 30,
+  maxRightWidth: 70,
+  leftCollapsedWidth: 44,
+  rightCollapsedWidth: 44,
+  leftResizerTestId: undefined,
+  rightResizerTestId: undefined,
+  ariaLabel: "工作区布局"
+});
+
+const emit = defineEmits<{
+  "update:leftWidth": [value: number];
+  "update:rightWidth": [value: number];
+}>();
+
+const layoutRef = ref<HTMLElement | null>(null);
+const resizing = ref<"left" | "right" | null>(null);
+
+const clampedLeftWidth = computed(() => clamp(props.leftWidth, props.minLeftWidth, props.maxLeftWidth));
+const clampedRightWidth = computed(() => clamp(props.rightWidth, props.minRightWidth, props.maxRightWidth));
+
+const layoutStyle = computed(() => {
+  const leftColumn = props.leftCollapsed
+    ? `${props.leftCollapsedWidth}px`
+    : `minmax(${props.leftCollapsedWidth}px, ${clampedLeftWidth.value}%)`;
+  if (!props.rightOpen) {
+    return { gridTemplateColumns: `${leftColumn} 6px minmax(0, 1fr)` };
+  }
+  const mainShare = props.rightCollapsed ? "minmax(0, 1fr)" : `minmax(0, ${100 - clampedRightWidth.value}fr)`;
+  const rightResizeColumn = props.rightCollapsed ? "0" : "6px";
+  const rightColumn = props.rightCollapsed ? `${props.rightCollapsedWidth}px` : `minmax(280px, ${clampedRightWidth.value}fr)`;
+  return { gridTemplateColumns: `${leftColumn} 6px ${mainShare} ${rightResizeColumn} ${rightColumn}` };
+});
+
+onBeforeUnmount(() => stopResize());
+
+function startResize(kind: "left" | "right", event: PointerEvent): void {
+  if (kind === "left" && props.leftCollapsed) return;
+  if (kind === "right" && (!props.rightOpen || props.rightCollapsed)) return;
+  event.preventDefault();
+  resizing.value = kind;
+  window.addEventListener("pointermove", resizePane);
+  window.addEventListener("pointerup", stopResize, { once: true });
+}
+
+function resizePane(event: PointerEvent): void {
+  const rect = layoutRef.value?.getBoundingClientRect();
+  if (!rect || rect.width <= 0 || !resizing.value) return;
+  if (resizing.value === "left") {
+    emit("update:leftWidth", Math.round(clamp(((event.clientX - rect.left) / rect.width) * 100, props.minLeftWidth, props.maxLeftWidth)));
+    return;
+  }
+  const leftPixels = props.leftCollapsed ? props.leftCollapsedWidth : rect.width * (clampedLeftWidth.value / 100);
+  const remaining = Math.max(320, rect.width - leftPixels - 18);
+  emit("update:rightWidth", Math.round(clamp(((rect.right - event.clientX) / remaining) * 100, props.minRightWidth, props.maxRightWidth)));
+}
+
+function stopResize(): void {
+  resizing.value = null;
+  window.removeEventListener("pointermove", resizePane);
+  window.removeEventListener("pointerup", stopResize);
+}
+
+function clamp(value: number, min: number, max: number): number {
+  if (!Number.isFinite(value)) return min;
+  return Math.min(max, Math.max(min, value));
+}
+</script>
+
+<template>
+  <section
+    ref="layoutRef"
+    class="split-workspace-layout"
+    :style="layoutStyle"
+    :aria-label="ariaLabel"
+    :data-left-collapsed="leftCollapsed"
+    :data-right-open="rightOpen"
+    :data-right-collapsed="rightCollapsed"
+    :data-resizing="resizing || undefined"
+  >
+    <aside class="split-workspace-pane split-workspace-left" :data-collapsed="leftCollapsed">
+      <slot name="left" />
+    </aside>
+    <div
+      class="split-workspace-resizer split-workspace-resizer-left"
+      :data-testid="leftResizerTestId"
+      role="separator"
+      aria-orientation="vertical"
+      :aria-valuenow="Math.round(clampedLeftWidth)"
+      @pointerdown="startResize('left', $event)"
+    />
+    <main class="split-workspace-main">
+      <slot />
+    </main>
+    <div
+      v-if="rightOpen"
+      class="split-workspace-resizer split-workspace-resizer-right"
+      :data-testid="rightResizerTestId"
+      role="separator"
+      aria-orientation="vertical"
+      :aria-valuenow="Math.round(clampedRightWidth)"
+      @pointerdown="startResize('right', $event)"
+    />
+    <aside v-if="rightOpen" class="split-workspace-pane split-workspace-right" :data-collapsed="rightCollapsed">
+      <slot name="right" />
+    </aside>
+  </section>
+</template>
+
+<style scoped>
+.split-workspace-layout {
+  display: grid;
+  min-width: 0;
+  min-height: 0;
+  height: 100%;
+  overflow: hidden;
+  gap: 0;
+}
+
+.split-workspace-pane,
+.split-workspace-main {
+  min-width: 0;
+  min-height: 0;
+  overflow: hidden;
+}
+
+.split-workspace-resizer {
+  min-width: 0;
+  border-inline: 1px solid transparent;
+  border-radius: 999px;
+  background: linear-gradient(90deg, transparent 1px, #cbd8d2 2px, #cbd8d2 4px, transparent 5px);
+  cursor: col-resize;
+}
+
+.split-workspace-resizer-right {
+  opacity: 1;
+}
+
+.split-workspace-layout[data-left-collapsed="true"] .split-workspace-resizer-left,
+.split-workspace-layout[data-right-collapsed="true"] .split-workspace-resizer-right {
+  pointer-events: none;
+  opacity: 0;
+}
+
+.split-workspace-layout[data-resizing] {
+  user-select: none;
+}
+
+@media (max-width: 980px) {
+  .split-workspace-layout {
+    display: grid;
+    height: auto;
+    min-height: 0;
+    grid-template-columns: 1fr !important;
+    gap: 10px;
+    overflow: visible;
+  }
+
+  .split-workspace-resizer {
+    display: none;
+  }
+}
+</style>
diff --git a/web/hwlab-cloud-web/src/views/projects/MdtodoView.vue b/web/hwlab-cloud-web/src/views/projects/MdtodoView.vue
index f981d83e..f925c01b 100644
--- a/web/hwlab-cloud-web/src/views/projects/MdtodoView.vue
+++ b/web/hwlab-cloud-web/src/views/projects/MdtodoView.vue
@@ -4,11 +4,12 @@
 <script setup lang="ts">
 import DOMPurify from "dompurify";
 import { marked } from "marked";
-import { computed, onBeforeUnmount, onMounted, reactive, ref, watch } from "vue";
+import { computed, onMounted, reactive, ref, watch } from "vue";
 import { useRoute, useRouter } from "vue-router";
 import { agentAPI, projectManagementAPI, workbenchAPI, type MdtodoFileRecord, type MdtodoReportPreviewRecord, type MdtodoTaskDetailRecord, type MdtodoTaskLinkRecord, type MdtodoTaskMutationInput, type MdtodoTaskPage, type MdtodoTaskRecord, type ProjectNavigationResponse, type ProjectSource, type ProjectSourceInput, type ProjectWorkbenchLinkRecord } from "@/api";
 import EmptyState from "@/components/common/EmptyState.vue";
 import LoadingState from "@/components/common/LoadingState.vue";
+import SplitWorkspaceLayout from "@/components/layout/SplitWorkspaceLayout.vue";
 import type { ApiError, ErrorDiagnostic } from "@/types";
 
 const router = useRouter();
@@ -55,7 +56,8 @@ const taskStatusFilter = ref("all");
 const collapsedTaskRefs = ref<Set<string>>(new Set());
 const taskPaneCollapsed = ref(false);
 const taskPaneWidth = ref(30);
-const taskPaneResize = ref<{ left: number; width: number } | null>(null);
+const reportPaneCollapsed = ref(false);
+const reportPaneWidth = ref(50);
 const editingTitle = ref(false);
 const editingBody = ref(false);
 const editTitle = ref("");
@@ -127,10 +129,9 @@ const selectedTaskLinks = computed(() => taskDetail.value?.links ?? []);
 const selectedTaskBodyHtml = computed(() => markdownToHtml(selectedTaskBody.value));
 const reportPreviewHtml = computed(() => markdownToHtml(reportPreview.value?.content ?? ""));
 const selectedFileName = computed(() => selectedFile.value ? fileDisplayName(selectedFile.value) : selectedTask.value?.fileRef || "-");
-const workspaceStyle = computed(() => ({ "--mdtodo-task-pane-width": taskPaneCollapsed.value ? "44px" : `${taskPaneWidth.value}%` }));
+const reportPaneOpen = computed(() => Boolean(reportPreview.value));
 
 onMounted(() => void loadPage());
-onBeforeUnmount(() => stopTaskPaneResize());
 
 watch(selectedSourceId, async (sourceId) => {
   if (!sourceId || loading.value || applyingRouteSelection.value) return;
@@ -280,30 +281,6 @@ function hasChildren(task: MdtodoTaskRecord): boolean {
   return (childrenByParent.value.get(task.taskRef) ?? []).length > 0;
 }
 
-function startTaskPaneResize(event: PointerEvent): void {
-  if (taskPaneCollapsed.value) return;
-  const workspace = (event.currentTarget as HTMLElement).closest(".mdtodo-workspace");
-  const rect = workspace?.getBoundingClientRect();
-  if (!rect || rect.width <= 0) return;
-  event.preventDefault();
-  taskPaneResize.value = { left: rect.left, width: rect.width };
-  window.addEventListener("pointermove", resizeTaskPane);
-  window.addEventListener("pointerup", stopTaskPaneResize, { once: true });
-}
-
-function resizeTaskPane(event: PointerEvent): void {
-  const state = taskPaneResize.value;
-  if (!state) return;
-  const percent = ((event.clientX - state.left) / state.width) * 100;
-  taskPaneWidth.value = Math.min(45, Math.max(22, Math.round(percent)));
-}
-
-function stopTaskPaneResize(): void {
-  taskPaneResize.value = null;
-  window.removeEventListener("pointermove", resizeTaskPane);
-  window.removeEventListener("pointerup", stopTaskPaneResize);
-}
-
 function openTaskCreateDialog(): void {
   taskMutationError.value = null;
   taskMutationMessage.value = null;
@@ -475,6 +452,7 @@ async function openReportPreview(link: MdtodoTaskLinkRecord): Promise<void> {
     const report = response.data?.report ?? null;
     if (!report?.content) throw new Error("报告内容未返回");
     reportPreview.value = report;
+    reportPaneCollapsed.value = false;
     activeReportLink.value = response.data?.link ?? link;
     void syncSelectionRoute({ replace: false, reportLinkId: activeReportLink.value?.linkId ?? link.linkId });
   } catch (err) {
@@ -484,6 +462,14 @@ async function openReportPreview(link: MdtodoTaskLinkRecord): Promise<void> {
   }
 }
 
+function closeReportPreview(updateRoute = true): void {
+  reportPreview.value = null;
+  activeReportLink.value = null;
+  showReportFullscreen.value = false;
+  reportPaneCollapsed.value = false;
+  if (updateRoute) void syncSelectionRoute({ replace: false });
+}
+
 async function openReportPreviewById(linkId: string, updateRoute = true): Promise<void> {
   const target = selectedTaskLinks.value.find((link) => link.linkId === linkId || link.label === linkId || link.relativePath?.includes(linkId) || link.href?.includes(linkId));
   if (!target) {
@@ -774,7 +760,18 @@ function displayDate(value?: string | null): string {
       <p v-if="sourceMessage" class="source-message" data-testid="mdtodo-source-message">{{ sourceMessage }}</p>
       <p v-if="sourceError" class="source-error" data-testid="mdtodo-source-error">{{ sourceError }}</p>
 
-      <section class="mdtodo-workspace" :style="workspaceStyle" :data-tree-collapsed="taskPaneCollapsed">
+      <SplitWorkspaceLayout
+        v-model:left-width="taskPaneWidth"
+        v-model:right-width="reportPaneWidth"
+        class="mdtodo-workspace"
+        :left-collapsed="taskPaneCollapsed"
+        :right-open="reportPaneOpen"
+        :right-collapsed="reportPaneCollapsed"
+        left-resizer-test-id="mdtodo-task-pane-resizer"
+        right-resizer-test-id="mdtodo-report-pane-resizer"
+        aria-label="MDTODO 工作区"
+      >
+        <template #left>
         <section class="data-panel mdtodo-task-panel" data-testid="mdtodo-task-tree" :data-collapsed="taskPaneCollapsed">
           <header class="mdtodo-panel-header">
             <div><h2>{{ taskPaneCollapsed ? '纲' : '任务树' }}</h2><p v-if="!taskPaneCollapsed">{{ filteredTasks.length }} / {{ taskPage?.total ?? fileScopedTasks.length }} tasks<span v-if="taskPage?.hasMore"> · window {{ taskPage.limit }}</span></p></div>
@@ -808,10 +805,9 @@ function displayDate(value?: string | null): string {
           </div>
           </template>
         </section>
+        </template>
 
-        <div class="task-pane-resizer" data-testid="mdtodo-task-pane-resizer" role="separator" aria-orientation="vertical" :aria-valuenow="taskPaneWidth" @pointerdown="startTaskPaneResize" />
-
-        <aside class="data-panel mdtodo-detail-panel" data-testid="mdtodo-task-detail">
+        <section class="data-panel mdtodo-detail-panel" data-testid="mdtodo-task-detail">
           <header class="mdtodo-detail-header">
             <div class="task-title-block">
               <span class="task-id-large">{{ selectedTask?.taskId || 'R?' }}</span>
@@ -864,7 +860,7 @@ function displayDate(value?: string | null): string {
                 <p v-if="taskMutationError" class="source-error" data-testid="mdtodo-task-mutation-error">{{ taskMutationError }}</p>
               </section>
 
-              <aside class="report-section" data-testid="mdtodo-report-section">
+              <section class="report-link-section" data-testid="mdtodo-report-section">
                 <header><strong>报告</strong><span v-if="reportLoading">加载中</span></header>
                 <div v-if="selectedTaskLinks.length" class="report-link-list">
                   <button v-for="link in selectedTaskLinks" :key="link.linkId" class="report-link-button" type="button" data-testid="mdtodo-report-link" :disabled="link.kind !== 'markdown-report' || reportLoading" @click="openReportPreview(link)">
@@ -874,14 +870,7 @@ function displayDate(value?: string | null): string {
                 </div>
                 <p v-else class="empty-inline">暂无报告链接</p>
                 <p v-if="reportError" class="source-error" data-testid="mdtodo-report-error">{{ reportError }}</p>
-                <article v-if="reportPreview" class="report-preview" data-testid="mdtodo-report-preview">
-                  <header>
-                    <strong>{{ activeReportLink?.label || reportPreview.relativePath || 'Report' }}</strong>
-                    <button class="btn btn-secondary" type="button" data-testid="mdtodo-report-fullscreen" @click="showReportFullscreen = true">全屏</button>
-                  </header>
-                  <div class="markdown-body" v-html="reportPreviewHtml" />
-                </article>
-              </aside>
+              </section>
             </section>
             <p class="launch-blocker" data-testid="mdtodo-workbench-launch-blocker">{{ workbenchLaunchEnabled ? 'Workbench Launch API ready' : 'Workbench Launch capability unavailable' }}</p>
             <p v-if="launchError" class="launch-blocker" data-testid="mdtodo-workbench-launch-error">{{ launchError }}</p>
@@ -893,8 +882,24 @@ function displayDate(value?: string | null): string {
               <p v-else>暂无关联 session。</p>
             </section>
           </template>
-        </aside>
-      </section>
+        </section>
+
+        <template #right>
+          <aside v-if="reportPreview" class="data-panel report-sidebar" data-testid="mdtodo-report-sidebar" :data-collapsed="reportPaneCollapsed">
+            <header class="report-sidebar-header">
+              <button class="icon-button" type="button" data-testid="mdtodo-report-sidebar-toggle" :aria-label="reportPaneCollapsed ? '展开报告侧栏' : '收起报告侧栏'" @click="reportPaneCollapsed = !reportPaneCollapsed">{{ reportPaneCollapsed ? '‹' : '›' }}</button>
+              <strong v-if="!reportPaneCollapsed">{{ activeReportLink?.label || reportPreview.relativePath || 'Report' }}</strong>
+              <div v-if="!reportPaneCollapsed" class="report-sidebar-actions">
+                <button class="btn btn-secondary" type="button" data-testid="mdtodo-report-fullscreen" @click="showReportFullscreen = true">全屏</button>
+                <button class="icon-button" type="button" aria-label="关闭报告预览" data-testid="mdtodo-report-close" @click="closeReportPreview()">×</button>
+              </div>
+            </header>
+            <article v-if="!reportPaneCollapsed" class="report-preview" data-testid="mdtodo-report-preview">
+              <div class="markdown-body" v-html="reportPreviewHtml" />
+            </article>
+          </aside>
+        </template>
+      </SplitWorkspaceLayout>
     </template>
 
     <div v-if="showInfo" class="modal-backdrop" data-testid="mdtodo-info-popover" role="dialog" aria-modal="true" aria-label="MDTODO 摘要" @click.self="showInfo = false">
@@ -962,7 +967,7 @@ function displayDate(value?: string | null): string {
 </template>
 
 <style scoped>
-.mdtodo-page { display: grid; min-width: 0; gap: 10px; }
+.mdtodo-page { display: grid; height: calc(100dvh - 68px); max-height: calc(100dvh - 68px); min-width: 0; min-height: 0; grid-template-rows: auto auto auto minmax(0, 1fr); gap: 10px; overflow: hidden; }
 .mdtodo-compact-header { display: flex; min-width: 0; min-height: 44px; align-items: center; justify-content: space-between; gap: 12px; border-bottom: 1px solid #d8e2df; padding: 0 2px 8px; }
 .mdtodo-compact-header span { color: #64706b; font-size: 11px; font-weight: 800; text-transform: uppercase; }
 .mdtodo-compact-header h1 { margin: 1px 0 0; color: #14211d; font-size: 20px; line-height: 1.1; }
@@ -983,15 +988,12 @@ function displayDate(value?: string | null): string {
 .source-error { margin: 0; border-radius: 6px; padding: 8px 10px; font-size: 13px; }
 .source-message { border: 1px solid #bbf7d0; background: #f0fdf4; color: #166534; }
 .source-error { border: 1px solid #fecaca; background: #fef2f2; color: #991b1b; }
-.mdtodo-workspace { display: grid; min-height: min(760px, calc(100dvh - 158px)); grid-template-columns: minmax(44px, var(--mdtodo-task-pane-width, 30%)) 6px minmax(0, 1fr); gap: 8px; }
-.task-pane-resizer { border-inline: 1px solid transparent; border-radius: 999px; background: linear-gradient(90deg, transparent 2px, #cbd8d2 2px, #cbd8d2 4px, transparent 4px); cursor: col-resize; }
-.mdtodo-workspace[data-tree-collapsed="true"] { grid-template-columns: 44px 0 minmax(0, 1fr); }
-.mdtodo-workspace[data-tree-collapsed="true"] .task-pane-resizer { pointer-events: none; opacity: 0; }
+.mdtodo-workspace { min-height: 0; height: 100%; }
 .mdtodo-task-panel,
 .mdtodo-detail-panel,
 .mdtodo-error { display: grid; min-width: 0; min-height: 0; align-content: start; gap: 12px; padding: 12px; overflow: auto; }
 .mdtodo-task-panel[data-collapsed="true"] { justify-items: center; padding: 8px 4px; overflow: hidden; }
-.mdtodo-detail-panel { align-content: stretch; grid-template-rows: auto minmax(0, 1fr) auto auto; overflow: hidden; }
+.mdtodo-detail-panel { height: 100%; align-content: stretch; grid-template-rows: auto minmax(0, 1fr) auto auto; overflow: hidden; }
 .mdtodo-panel-header { display: flex; min-width: 0; align-items: center; justify-content: space-between; gap: 12px; }
 .mdtodo-panel-header h2 { margin: 0; color: #14211d; font-size: 16px; line-height: 1.2; }
 .mdtodo-panel-header p { margin: 3px 0 0; color: #64706b; font-size: 12px; }
@@ -1016,7 +1018,7 @@ function displayDate(value?: string | null): string {
 .task-title-read:hover { background: #f4fbf8; }
 .detail-toolbar { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
 .detail-toolbar select { min-width: 112px; height: 34px; border: 1px solid #cbd8d2; border-radius: 6px; background: #fff; color: #14211d; padding: 0 8px; font: inherit; }
-.task-detail-content { display: grid; min-width: 0; min-height: 0; grid-template-columns: minmax(0, 1fr) minmax(260px, 0.32fr); gap: 10px; }
+.task-detail-content { display: grid; min-width: 0; min-height: 0; grid-template-columns: minmax(0, 1fr); gap: 10px; overflow: hidden; }
 .task-detail-list,
 .summary-list { display: grid; gap: 8px; margin: 0; }
 .task-detail-list div,
@@ -1031,7 +1033,7 @@ function displayDate(value?: string | null): string {
 .inline-editor { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 8px; align-items: center; }
 .inline-editor input { width: 100%; min-width: 0; border: 1px solid #cbd8d4; border-radius: 6px; color: #14211d; font: inherit; padding: 8px 9px; }
 .status-inline { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; align-items: center; }
-.task-editor { display: grid; min-width: 0; min-height: 0; grid-template-rows: auto minmax(0, 1fr) auto auto auto; gap: 10px; border: 1px solid #d8e2df; border-radius: 8px; background: #fbfefd; padding: 12px; }
+.task-editor { display: grid; min-width: 0; min-height: 0; grid-template-rows: auto minmax(0, 1fr) auto auto auto; gap: 10px; border: 1px solid #d8e2df; border-radius: 8px; background: #fbfefd; padding: 12px; overflow: hidden; }
 .editor-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(132px, 0.32fr); gap: 10px; }
 .task-editor label { display: grid; min-width: 0; gap: 5px; color: #52615c; font-size: 12px; font-weight: 800; }
 .task-editor input,
@@ -1040,9 +1042,10 @@ function displayDate(value?: string | null): string {
 .task-editor textarea { min-height: 72px; resize: vertical; line-height: 1.4; }
 .editor-block { display: grid; gap: 5px; }
 .task-body-section,
-.report-section { display: grid; min-width: 0; min-height: 0; gap: 8px; }
+.report-link-section,
+.report-sidebar { display: grid; min-width: 0; min-height: 0; gap: 8px; }
 .task-body-section header,
-.report-section header,
+.report-link-section header,
 .report-preview header { display: flex; min-width: 0; align-items: center; justify-content: space-between; gap: 10px; color: #14211d; font-size: 13px; }
 .task-body-section header small { color: #64706b; font-size: 12px; }
 .inline-body-editor { display: grid; gap: 8px; }
@@ -1056,15 +1059,20 @@ function displayDate(value?: string | null): string {
 .markdown-body :deep(code) { border-radius: 4px; background: #eef6f2; padding: 1px 4px; color: #0f766e; }
 .markdown-body :deep(pre code) { background: transparent; color: inherit; padding: 0; white-space: inherit; }
 .markdown-body :deep(a) { color: #0f766e; font-weight: 750; }
-.task-body-rendered { min-height: min(520px, calc(100dvh - 330px)); overflow: auto; border: 1px solid #d8e2df; border-radius: 6px; background: #fff; padding: 12px; }
+.task-body-rendered { min-height: 0; overflow: auto; border: 1px solid #d8e2df; border-radius: 6px; background: #fff; padding: 12px; }
 .empty-inline { margin: 0; color: #64706b; }
-.report-section { grid-template-rows: auto auto auto minmax(0, 1fr); border: 1px solid #d8e2df; border-radius: 8px; background: #fff; padding: 10px; overflow: hidden; }
+.report-link-section { grid-template-rows: auto auto auto; border: 1px solid #d8e2df; border-radius: 8px; background: #fff; padding: 10px; overflow: auto; }
 .report-link-list { display: grid; gap: 6px; }
 .report-link-button { display: grid; width: 100%; min-width: 0; gap: 3px; border: 1px solid #d8e2df; border-radius: 6px; background: #fff; color: #14211d; padding: 8px 10px; text-align: left; }
 .report-link-button:disabled { opacity: 0.55; }
 .report-link-button span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 800; }
 .report-link-button small { color: #64706b; overflow-wrap: anywhere; }
-.report-preview { display: grid; min-height: 0; gap: 8px; border-top: 1px solid #e2ece8; padding-top: 8px; }
+.report-sidebar { height: 100%; grid-template-rows: auto minmax(0, 1fr); border: 1px solid #d8e2df; border-radius: 8px; background: #fff; padding: 10px; overflow: hidden; }
+.report-sidebar[data-collapsed="true"] { justify-items: center; padding: 8px 4px; }
+.report-sidebar-header { display: flex; min-width: 0; align-items: center; justify-content: space-between; gap: 8px; color: #14211d; font-size: 13px; }
+.report-sidebar-header strong { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.report-sidebar-actions { display: inline-flex; flex: 0 0 auto; align-items: center; gap: 6px; }
+.report-preview { display: grid; min-height: 0; gap: 8px; border-top: 1px solid #e2ece8; padding-top: 8px; overflow: hidden; }
 .report-preview > .markdown-body { min-height: 0; overflow: auto; }
 .task-create-box { display: grid; gap: 8px; border-top: 1px solid #e2ece8; padding-top: 10px; }
 .editor-actions { display: flex; flex-wrap: wrap; gap: 8px; }
@@ -1082,8 +1090,8 @@ function displayDate(value?: string | null): string {
 .mdtodo-dialog h2 { margin: 0; font-size: 18px; }
 .task-create-dialog { width: min(620px, calc(100vw - 32px)); }
 .task-create-dialog textarea { width: 100%; min-width: 0; border: 1px solid #cbd8d4; border-radius: 6px; background: #fff; color: #14211d; font: inherit; line-height: 1.4; padding: 8px 9px; resize: vertical; }
-.report-fullscreen-dialog { width: min(1120px, calc(100vw - 32px)); min-height: min(780px, calc(100dvh - 80px)); align-content: start; }
-.report-fullscreen-body { max-height: calc(100dvh - 170px); overflow: auto; border: 1px solid #e2e8f0; border-radius: 6px; padding: 14px; }
+.report-fullscreen-dialog { width: min(1180px, calc(100vw - 48px)); height: min(820px, calc(100dvh - 64px)); max-height: calc(100dvh - 64px); grid-template-rows: auto minmax(0, 1fr); align-content: stretch; overflow: hidden; }
+.report-fullscreen-body { min-height: 0; height: 100%; overflow: auto; border: 1px solid #e2e8f0; border-radius: 6px; padding: 14px; }
 .source-form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
 .source-form label { display: grid; min-width: 0; gap: 5px; color: #52615c; font-size: 12px; font-weight: 800; }
 .source-form footer { display: flex; grid-column: 1 / -1; flex-wrap: wrap; gap: 8px; }
@@ -1092,13 +1100,13 @@ function displayDate(value?: string | null): string {
 @media (max-width: 980px) {
   .mdtodo-toolbar,
   .mdtodo-workspace { grid-template-columns: 1fr; }
-  .task-pane-resizer { display: none; }
   .toolbar-actions { justify-content: flex-start; }
   .task-tools { width: 100%; grid-template-columns: 1fr; }
-  .mdtodo-workspace { min-height: 0; }
+  .mdtodo-page { height: auto; max-height: none; overflow: visible; }
+  .mdtodo-workspace { min-height: 0; height: auto; }
   .mdtodo-task-panel[data-collapsed="true"] { justify-items: stretch; }
   .task-detail-content { grid-template-columns: 1fr; }
-  .report-section { max-height: none; }
+  .report-sidebar { min-height: 420px; }
 }
 @media (max-width: 640px) {
   .source-form { grid-template-columns: 1fr; }