diff --git a/src/features/workbench/components/workbench-top-bar-menus.tsx b/src/features/workbench/components/workbench-top-bar-menus.tsx
index 6f98d53..2957616 100644
--- a/src/features/workbench/components/workbench-top-bar-menus.tsx
+++ b/src/features/workbench/components/workbench-top-bar-menus.tsx
@@ -18,7 +18,7 @@ import {
   type LucideIcon
 } from "lucide-react";
 import { useRef, useState, type ReactNode } from "react";
-import { AnimatePresence } from "motion/react";
+import { AnimatePresence, motion, useReducedMotion } from "motion/react";
 import { ProjectSwitchDialog } from "./project-switch-dialog";
 import {
   MAP_COMPACT_RADIUS_CLASS_NAME,
@@ -138,6 +138,9 @@ export function AlertMenu({
   onToggleConditionFeed: () => void;
   onAnalyzeAlertsWithAgent: () => void | Promise<void>;
 }) {
+  const reduceMotion = useReducedMotion();
+  const keyboardInteraction = useRef(false);
+  const skipRemovalMotion = reduceMotion === true || keyboardInteraction.current;
   const hasAlerts = alerts.length > 0;
   const hasCriticalAlerts = alerts.some((alert) => alert.severity !== "warning");
   const alertSummaryTone = hasCriticalAlerts ? "danger" : hasAlerts ? "warning" : "neutral";
@@ -190,7 +193,10 @@ export function AlertMenu({
           )}
         </button>
       </DropdownMenuTrigger>
-      <DropdownMenuContent align="end" sideOffset={8} className={cn("w-[min(392px,calc(100vw-24px))]", menuSurfaceClassName)}>
+      <DropdownMenuContent align="end" sideOffset={8} className={cn("w-[min(392px,calc(100vw-24px))]", menuSurfaceClassName)}
+        onKeyDownCapture={() => { keyboardInteraction.current = true; }}
+        onPointerDownCapture={() => { keyboardInteraction.current = false; }}
+      >
         <AlertQueueSummary
           count={alerts.length}
           latestAlertTime={latestAlertTime}
@@ -199,33 +205,42 @@ export function AlertMenu({
           tone={hasAlerts ? alertSummaryTone : "success"}
         />
         <MenuSectionLabel>待处理事项</MenuSectionLabel>
-        <div className="scheduled-feed-scroll max-h-[min(52dvh,420px)] overflow-y-auto pr-1">
-          {hasAlerts ? alerts.map((alert) => {
-            const tone = alert.severity === "warning" ? "warning" : "danger";
-            return (
-              <div
-                key={alert.id}
-                className={cn("surface-well my-1 px-3 pb-3 pt-1", MAP_COMPACT_RADIUS_CLASS_NAME)}
-              >
-                <div className="flex min-w-0 items-center justify-between gap-2">
+        <div className="scheduled-feed-scroll relative max-h-[min(52dvh,420px)] overflow-x-hidden overflow-y-auto pr-1">
+          <AnimatePresence initial={false} mode="popLayout" custom={skipRemovalMotion}>
+            {hasAlerts ? alerts.map((alert) => {
+              const tone = alert.severity === "warning" ? "warning" : "danger";
+              return (
+                <motion.div
+                  key={alert.id}
+                  data-alert-id={alert.id}
+                  layout="position"
+                  initial={false}
+                  animate={{ opacity: 1, x: 0 }}
+                  exit="removed"
+                  variants={{ removed: (skip: boolean) => ({
+                    opacity: 0, x: skip ? 0 : 12, pointerEvents: "none",
+                    transition: { duration: skip ? 0 : 0.18, ease: [0.4, 0, 1, 1] }
+                  }) }}
+                  transition={{ duration: skipRemovalMotion ? 0 : 0.18, ease: [0.4, 0, 1, 1] }}
+                  className={cn(
+                    tone === "warning" ? "status-tone-warning" : "status-tone-danger",
+                    "relative my-1 min-h-[88px] border border-transparent py-3 pl-3 pr-[76px] transition-colors hover:border-[var(--status-border)] hover:bg-[var(--action-soft)] focus-within:border-[var(--status-border)] focus-within:bg-[var(--action-soft)]",
+                    MAP_COMPACT_RADIUS_CLASS_NAME,
+                    menuReadableRowClassName
+                  )}
+                >
                   <span className="flex min-w-0 items-center gap-2 text-xs text-[var(--ink-muted)]">
                     <StatusDot tone={tone} size="md" />
                     <span className="font-mono tabular-nums">{alert.time}</span>
                   </span>
-                  <div className="flex shrink-0 items-center gap-0.5">
-                    <DropdownMenuItem
-                      aria-label={`打开通知：${alert.title}`}
-                      className={cn("h-10 justify-center gap-1 px-2 text-xs font-medium text-[var(--action-blue)] active:scale-95", MAP_COMPACT_RADIUS_CLASS_NAME, menuReadableRowClassName)}
-                      onSelect={() => onSelectAlert(alert)}
-                    >
-                      打开
-                      <ChevronRight size={14} aria-hidden="true" />
-                    </DropdownMenuItem>
+                  <p className="mt-2 break-words text-sm font-semibold leading-5 text-slate-950">{alert.title}</p>
+                  <p className="mt-1 break-words text-xs leading-5 text-[var(--ink-muted)]">{alert.description}</p>
+                  <div className="absolute bottom-1 right-1 top-1 flex w-16 flex-col items-center justify-between">
                     {onRemoveAlert ? (
                       <DropdownMenuItem
                         aria-label={`移除通知：${alert.title}`}
                         title="移除通知"
-                        className={cn("h-10 w-10 justify-center p-0 text-[var(--ink-muted)] active:scale-95", MAP_COMPACT_RADIUS_CLASS_NAME, menuReadableRowClassName)}
+                        className={cn("h-10 w-10 shrink-0 justify-center p-0 text-[var(--ink-muted)] active:scale-95", MAP_COMPACT_RADIUS_CLASS_NAME, menuReadableRowClassName)}
                         onSelect={(event) => {
                           event.preventDefault();
                           onRemoveAlert(alert);
@@ -234,23 +249,29 @@ export function AlertMenu({
                         <X size={14} aria-hidden="true" />
                       </DropdownMenuItem>
                     ) : null}
+                    <DropdownMenuItem
+                      aria-label={`打开通知：${alert.title}`}
+                      title="打开通知"
+                      className={cn("h-10 w-10 shrink-0 justify-center p-0 text-[var(--action-blue)] active:scale-95", MAP_COMPACT_RADIUS_CLASS_NAME, menuReadableRowClassName)}
+                      onSelect={() => onSelectAlert(alert)}
+                    >
+                      <ChevronRight size={14} aria-hidden="true" />
+                    </DropdownMenuItem>
                   </div>
+                </motion.div>
+              );
+            }) : (
+              <div key="empty-alert-queue" className={cn("surface-reading my-1 grid min-h-[76px] place-items-center border border-dashed border-[var(--surface-divider)] px-3 py-3 text-center", MAP_COMPACT_RADIUS_CLASS_NAME)}>
+                <div className="min-w-0">
+                  <SemanticStatusIcon tone="success" size="md" className="mx-auto">
+                    <CheckCircle2 size={16} />
+                  </SemanticStatusIcon>
+                  <p className="mt-1 text-xs font-semibold text-slate-700">当前无待处理事项</p>
+                  <p className="mt-0.5 text-xs leading-4 text-[var(--ink-muted)]">新的待办和告警会进入这里。</p>
                 </div>
-                <p className="break-words text-sm font-semibold leading-5 text-slate-950">{alert.title}</p>
-                <p className="mt-1 break-words text-xs leading-5 text-[var(--ink-muted)]">{alert.description}</p>
               </div>
-            );
-          }) : (
-            <div className={cn("surface-reading my-1 grid min-h-[76px] place-items-center border border-dashed border-[var(--surface-divider)] px-3 py-3 text-center", MAP_COMPACT_RADIUS_CLASS_NAME)}>
-              <div className="min-w-0">
-                <SemanticStatusIcon tone="success" size="md" className="mx-auto">
-                  <CheckCircle2 size={16} />
-                </SemanticStatusIcon>
-                <p className="mt-1 text-xs font-semibold text-slate-700">当前无待处理事项</p>
-                <p className="mt-0.5 text-xs leading-4 text-[var(--ink-muted)]">新的待办和告警会进入这里。</p>
-              </div>
-            </div>
-          )}
+            )}
+          </AnimatePresence>
         </div>
         <div className="mt-2 grid grid-cols-[minmax(0,1fr)_auto] gap-2 border-t border-[var(--surface-divider)]/70 pt-2">
           <MenuPlainButton
diff --git a/tests/browser/alert-removal.e2e.ts b/tests/browser/alert-removal.e2e.ts
index bcab769..b28ac82 100644
--- a/tests/browser/alert-removal.e2e.ts
+++ b/tests/browser/alert-removal.e2e.ts
@@ -2,9 +2,10 @@ import { expect, test } from "@playwright/test";
 import { investigationFixture, mockInvestigationPresentation } from "./support/mock-investigation-presentation";
 import type { OperationalTaskNotification } from "../../src/features/workbench/api/operational-task-client";
 
-for (const width of [1280, 375, 320]) {
-  test(`待办和告警可独立移除且刷新后保持 ${width}`, async ({ page }, testInfo) => {
+for (const { width, reducedMotion } of [{ width: 1280, reducedMotion: false }, { width: 375, reducedMotion: false }, { width: 320, reducedMotion: false }, { width: 320, reducedMotion: true }]) {
+  test(`待办和告警可独立移除且刷新后保持 ${width}${reducedMotion ? " 减少动态效果" : ""}`, async ({ page }, testInfo) => {
     await page.setViewportSize({ width, height: 900 });
+    await page.emulateMedia({ reducedMotion: reducedMotion ? "reduce" : "no-preference" });
     const task = investigationFixture(1, "通知移除测试调查");
     const notification: OperationalTaskNotification = {
       notification_id: "96000000-0000-4000-8000-000000000011", task_id: task.task_id,
@@ -32,25 +33,52 @@ for (const width of [1280, 375, 320]) {
     });
     await page.goto("/", { waitUntil: "domcontentloaded" });
     const trigger = page.getByRole("button", { name: /查看待办与告警/ });
-    await expect(trigger).toHaveAccessibleName("查看待办与告警，当前 2 条待处理事项");
+    // Runtime alerts and task notifications finish loading independently on a cold page.
+    await expect(trigger).toHaveAccessibleName("查看待办与告警，当前 2 条待处理事项", { timeout: 15_000 });
     await trigger.click();
     const menu = page.getByRole("menu");
     await expect(menu).toBeVisible();
     const removeTask = page.getByRole("menuitem", { name: `移除通知：${notification.title}` });
     await expect(removeTask).toBeVisible();
     const openTask = page.getByRole("menuitem", { name: `打开通知：${notification.title}` });
+    await expect(openTask).toHaveText("");
     const actions = await openTask.evaluate((element) => {
       const open = element.getBoundingClientRect();
-      const remove = element.nextElementSibling!.getBoundingClientRect();
-      return { topDifference: Math.abs(open.top - remove.top), gap: remove.left - open.right };
+      const remove = element.previousElementSibling!.getBoundingClientRect();
+      return { centerDifference: Math.abs((open.left + open.width / 2) - (remove.left + remove.width / 2)), gap: open.top - remove.bottom };
     });
-    expect(actions.topDifference).toBeLessThan(1);
+    expect(actions.centerDifference).toBeLessThan(1);
     expect(actions.gap).toBeGreaterThanOrEqual(0);
     const box = await menu.boundingBox();
     expect(box!.x).toBeGreaterThanOrEqual(0);
     expect(box!.x + box!.width).toBeLessThanOrEqual(width);
     await testInfo.attach(`alert-menu-${width}`, { body: await page.screenshot({ path: testInfo.outputPath("alert-menu.png"), style: "[data-sonner-toaster] { visibility: hidden !important; }" }), contentType: "image/png" });
-    await removeTask.click();
+    const row = page.locator(`[data-alert-id="operational-task-notification:${notification.notification_id}"]`);
+    if (!reducedMotion) {
+      const exitState = await removeTask.evaluate(async (element) => {
+        const row = element.closest("[data-alert-id]")!;
+        (element as HTMLElement).click();
+        const list = row.parentElement!;
+        let opacity = 1;
+        for (let frame = 0; frame < 30 && opacity === 1; frame++) {
+          await new Promise(requestAnimationFrame);
+          opacity = Number(getComputedStyle(row).opacity);
+        }
+        const style = getComputedStyle(row);
+        return { retained: row.isConnected, opacity, pointerEvents: style.pointerEvents,
+          overflowX: getComputedStyle(list).overflowX,
+          pageOverflows: document.documentElement.scrollWidth > window.innerWidth };
+      });
+      expect(exitState.retained).toBe(true);
+      expect(exitState.opacity).toBeGreaterThan(0);
+      expect(exitState.opacity).toBeLessThan(1);
+      expect(exitState.pointerEvents).toBe("none");
+      expect(exitState.overflowX).toBe("hidden");
+      expect(exitState.pageOverflows).toBe(false);
+    } else {
+      await removeTask.click();
+    }
+    await expect(row).toHaveCount(0);
     await expect(menu).toBeVisible();
     await expect(trigger).toHaveAccessibleName("查看待办与告警，当前 1 条待处理事项");
     await expect(page.getByRole("region", { name: "工况任务", exact: true })).toHaveCount(0);