diff --git a/vehicle-data-platform/apps/web/src/layout/AppShell.tsx b/vehicle-data-platform/apps/web/src/layout/AppShell.tsx
index 54ca5be5..7dfd960c 100644
--- a/vehicle-data-platform/apps/web/src/layout/AppShell.tsx
+++ b/vehicle-data-platform/apps/web/src/layout/AppShell.tsx
@@ -294,30 +294,46 @@ export function AppShell({
                 value={keyword}
                 onChange={setKeyword}
                 onEnterPress={search}
-                style={{ width: 320 }}
+                style={{ width: 280 }}
               />
               <Button theme="solid" type="primary" loading={searching} onClick={search}>查询车辆</Button>
             </Space>
             <div className="vp-topbar-context">
               <div className="vp-topbar-time-window" aria-label="客户时间窗">
-                <label>
-                  <span>开始</span>
+                <div className="vp-topbar-time-window-copy">
+                  <strong>客户时间窗</strong>
+                  <span>同步约束地图、轨迹、统计、导出和告警</span>
+                </div>
+                <label htmlFor="vp-customer-time-window-start">
+                  <span>开始日期</span>
                   <input
-                    aria-label="顶部时间窗开始"
-                    type="date"
+                    id="vp-customer-time-window-start"
+                    aria-label="客户时间窗开始日期"
+                    type="text"
+                    inputMode="numeric"
+                    pattern="\d{4}-\d{2}-\d{2}"
+                    placeholder="YYYY-MM-DD"
+                    maxLength={10}
                     value={dateFrom}
                     onChange={(event) => onCustomerTimeWindowChange?.({ dateFrom: event.currentTarget.value, dateTo })}
                   />
                 </label>
-                <label>
-                  <span>结束</span>
+                <label className="vp-sr-only" htmlFor="vp-customer-time-window-start">顶部时间窗开始</label>
+                <label htmlFor="vp-customer-time-window-end">
+                  <span>结束日期</span>
                   <input
-                    aria-label="顶部时间窗结束"
-                    type="date"
+                    id="vp-customer-time-window-end"
+                    aria-label="客户时间窗结束日期"
+                    type="text"
+                    inputMode="numeric"
+                    pattern="\d{4}-\d{2}-\d{2}"
+                    placeholder="YYYY-MM-DD"
+                    maxLength={10}
                     value={dateTo}
                     onChange={(event) => onCustomerTimeWindowChange?.({ dateFrom, dateTo: event.currentTarget.value })}
                   />
                 </label>
+                <label className="vp-sr-only" htmlFor="vp-customer-time-window-end">顶部时间窗结束</label>
                 <div className="vp-topbar-time-window-presets">
                   <button type="button" aria-label="顶部时间窗 今天" onClick={() => applyTimeWindowPreset(1)}>今天</button>
                   <button type="button" aria-label="顶部时间窗 近7天" onClick={() => applyTimeWindowPreset(7)}>近7天</button>
diff --git a/vehicle-data-platform/apps/web/src/styles/global.css b/vehicle-data-platform/apps/web/src/styles/global.css
index fb191b0a..aabecb27 100644
--- a/vehicle-data-platform/apps/web/src/styles/global.css
+++ b/vehicle-data-platform/apps/web/src/styles/global.css
@@ -238,13 +238,25 @@ body {
   min-width: 0;
 }
 
+.vp-sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
 .vp-topbar {
-  height: var(--vp-shell-header);
+  min-height: 72px;
   display: grid;
-  grid-template-columns: minmax(380px, 0.8fr) minmax(0, 1.2fr);
+  grid-template-columns: minmax(350px, 0.62fr) minmax(0, 1.38fr);
   align-items: center;
-  gap: 16px;
-  padding: 0 24px;
+  gap: 12px;
+  padding: 8px 24px;
   background: rgba(255, 255, 255, 0.9);
   border-bottom: 1px solid var(--vp-border);
   backdrop-filter: blur(12px);
@@ -261,26 +273,55 @@ body {
   min-width: 0;
   display: flex;
   align-items: center;
-  justify-content: flex-end;
-  gap: 8px;
-  white-space: nowrap;
+  align-content: center;
+  justify-content: flex-start;
+  gap: 6px;
+  overflow: hidden;
+  white-space: normal;
+  flex-wrap: wrap;
 }
 
 .vp-topbar-time-window {
   display: inline-flex;
   align-items: center;
-  gap: 4px;
-  padding: 2px;
+  gap: 6px;
+  min-width: 0;
+  max-width: 100%;
+  padding: 4px 6px;
   border: 1px solid var(--vp-border);
   border-radius: 8px;
   background: #f8fafc;
 }
 
+.vp-topbar-time-window-copy {
+  display: inline-flex;
+  flex-direction: column;
+  justify-content: center;
+  width: 136px;
+  flex: 0 0 auto;
+  line-height: 1.1;
+}
+
+.vp-topbar-time-window-copy strong {
+  color: var(--vp-text);
+  font-size: 12px;
+  font-weight: 700;
+}
+
+.vp-topbar-time-window-copy span {
+  max-width: 136px;
+  overflow: hidden;
+  color: var(--vp-text-muted);
+  font-size: 10px;
+  text-overflow: ellipsis;
+}
+
 .vp-topbar-time-window-presets {
   display: inline-flex;
   align-items: center;
   gap: 2px;
   padding-left: 2px;
+  flex: 0 0 auto;
 }
 
 .vp-topbar-time-window-presets button {
@@ -305,20 +346,23 @@ body {
 .vp-topbar-time-window label {
   display: inline-flex;
   align-items: center;
+  flex: 0 0 auto;
   gap: 4px;
   height: 28px;
-  padding: 0 6px;
+  padding: 0 4px 0 6px;
+  border-radius: 6px;
+  background: #ffffff;
   color: var(--vp-text-muted);
   font-size: 12px;
   font-weight: 600;
 }
 
 .vp-topbar-time-window input {
-  width: 118px;
+  width: 114px;
   height: 24px;
   border: 0;
-  border-radius: 6px;
-  background: #ffffff;
+  border-radius: 4px;
+  background: #f8fafc;
   color: var(--vp-text);
   font-size: 12px;
   outline: none;
@@ -332,6 +376,7 @@ body {
   height: 32px;
   display: inline-flex;
   align-items: center;
+  flex: 0 0 auto;
   padding: 2px;
   border: 1px solid var(--vp-border);
   border-radius: 8px;
diff --git a/vehicle-data-platform/apps/web/src/test/App.test.tsx b/vehicle-data-platform/apps/web/src/test/App.test.tsx
index 19396a6c..45956684 100644
--- a/vehicle-data-platform/apps/web/src/test/App.test.tsx
+++ b/vehicle-data-platform/apps/web/src/test/App.test.tsx
@@ -6706,9 +6706,14 @@ test('topbar customer time window scopes vehicle service tasks', async () => {
 
   render(<App />);
 
+  expect(screen.getByText('客户时间窗')).toBeInTheDocument();
+  expect(screen.getByText('同步约束地图、轨迹、统计、导出和告警')).toBeInTheDocument();
+  expect(screen.getByLabelText('客户时间窗开始日期')).toHaveAttribute('placeholder', 'YYYY-MM-DD');
+  expect(screen.getByLabelText('客户时间窗结束日期')).toHaveAttribute('placeholder', 'YYYY-MM-DD');
+
   fireEvent.change(screen.getByPlaceholderText('搜索 VIN / 车牌 / 手机号'), { target: { value: '粤A时间窗' } });
-  fireEvent.change(screen.getByLabelText('顶部时间窗开始'), { target: { value: '2026-07-01' } });
-  fireEvent.change(screen.getByLabelText('顶部时间窗结束'), { target: { value: '2026-07-03' } });
+  fireEvent.change(screen.getByLabelText('客户时间窗开始日期'), { target: { value: '2026-07-01' } });
+  fireEvent.change(screen.getByLabelText('客户时间窗结束日期'), { target: { value: '2026-07-03' } });
   fireEvent.click(screen.getByRole('button', { name: '查询车辆' }));
   expect(await screen.findByText('粤A时间窗 / VIN-TOPBAR-WINDOW')).toBeInTheDocument();