diff --git a/vehicle-data-platform/apps/web/src/v2/pages/AccessPage.test.tsx b/vehicle-data-platform/apps/web/src/v2/pages/AccessPage.test.tsx
index 30ddcf44..8bdd08c7 100644
--- a/vehicle-data-platform/apps/web/src/v2/pages/AccessPage.test.tsx
+++ b/vehicle-data-platform/apps/web/src/v2/pages/AccessPage.test.tsx
@@ -157,7 +157,11 @@ test('does not request or render admin-only thresholds for a read-only session',
 test('renders mobile access vehicles as selectable Semi cards', async () => {
   layout.mobile = true;
   prepareBaseData();
-  mocks.accessVehicles.mockResolvedValue({ items: [accessRow('VIN001', '粤A00001')], total: 1, limit: 50, offset: 0 });
+  const delayedRow = accessRow('VIN001', '粤A00001');
+  delayedRow.connectionState = 'degraded';
+  delayedRow.protocolStatuses[0].delayAbnormal = true;
+  delayedRow.protocolStatuses[0].dataDelaySec = 128;
+  mocks.accessVehicles.mockResolvedValue({ items: [delayedRow], total: 1, limit: 50, offset: 0 });
   const client = new QueryClient({ defaultOptions: { queries: { retry: false } } });
   const view = render(<QueryClientProvider client={client}><MemoryRouter future={ROUTER_FUTURE} initialEntries={['/access']}><AccessPage /></MemoryRouter></QueryClientProvider>);
 
@@ -191,9 +195,25 @@ test('renders mobile access vehicles as selectable Semi cards', async () => {
   expect(within(dialog).getByRole('button', { name: '关闭车辆接入详情' })).toBeInTheDocument();
   expect(dialog.querySelector('.v2-access-inspector-v3.semi-card')).toBeInTheDocument();
   expect(dialog.querySelector('.v2-access-inspector-focus.semi-card')).toBeInTheDocument();
-  expect(dialog.querySelector('.v2-access-inspector-summary.semi-descriptions')).toBeInTheDocument();
+  expect(dialog.querySelector('.v2-access-inspector-summary-grid')).toHaveAttribute('aria-label', '车辆接入概览');
+  expect(within(dialog).getByText('协议证据')).toBeInTheDocument();
+  expect(within(dialog).getByText('1 / 3 已接入').closest('.semi-tag')).toBeInTheDocument();
   expect(dialog.querySelector('.v2-access-protocol-details.semi-card-group')).toBeInTheDocument();
   expect(dialog.querySelectorAll('.v2-access-protocol-detail.semi-card')).toHaveLength(3);
+  const evidenceToggle = within(dialog).getByRole('button', { name: '收起 JT808 完整证据' });
+  expect(evidenceToggle).toHaveAttribute('aria-expanded', 'true');
+  expect(within(dialog).getByRole('region', { name: 'JT808 完整接入证据' })).toBeInTheDocument();
+  expect(within(dialog).getByText('test first seen')).toBeInTheDocument();
+  expect(within(dialog).getAllByText('当前未发现真实接入来源')).toHaveLength(2);
+  const vehicleRequestsBeforeEvidenceToggle = mocks.accessVehicles.mock.calls.length;
+  const summaryRequestsBeforeEvidenceToggle = mocks.accessSummary.mock.calls.length;
+  fireEvent.click(evidenceToggle);
+  expect(within(dialog).getByRole('button', { name: '查看 JT808 完整证据' })).toHaveAttribute('aria-expanded', 'false');
+  expect(within(dialog).queryByRole('region', { name: 'JT808 完整接入证据' })).not.toBeInTheDocument();
+  fireEvent.click(within(dialog).getByRole('button', { name: '查看 JT808 完整证据' }));
+  expect(within(dialog).getByRole('button', { name: '收起 JT808 完整证据' })).toHaveAttribute('aria-expanded', 'true');
+  expect(mocks.accessVehicles).toHaveBeenCalledTimes(vehicleRequestsBeforeEvidenceToggle);
+  expect(mocks.accessSummary).toHaveBeenCalledTimes(summaryRequestsBeforeEvidenceToggle);
   expect(document.querySelector('.v2-access-detail-sidesheet')).toHaveClass('semi-sidesheet-bottom');
   expect(document.querySelector('.v2-access-detail-sidesheet .semi-sidesheet-inner')).toHaveStyle({ height: 'min(84dvh, 740px)' });
   fireEvent.click(within(dialog).getByRole('button', { name: '关闭车辆接入详情' }));
diff --git a/vehicle-data-platform/apps/web/src/v2/pages/AccessPage.tsx b/vehicle-data-platform/apps/web/src/v2/pages/AccessPage.tsx
index 6027f5fa..8eb538bf 100644
--- a/vehicle-data-platform/apps/web/src/v2/pages/AccessPage.tsx
+++ b/vehicle-data-platform/apps/web/src/v2/pages/AccessPage.tsx
@@ -1,7 +1,7 @@
-import { IconChevronRight, IconClose, IconDownload, IconMore, IconRefresh, IconSave, IconSearch, IconSetting } from '@douyinfe/semi-icons';
+import { IconChevronDown, IconChevronRight, IconClose, IconDownload, IconMore, IconRefresh, IconSave, IconSearch, IconSetting } from '@douyinfe/semi-icons';
 import { Button, Card, CardGroup, Collapse, Descriptions, Dropdown, Empty, Input, Select, SideSheet, Spin, Table, Tag, Typography } from '@douyinfe/semi-ui';
 import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
-import { FormEvent, KeyboardEvent, memo, useEffect, useMemo, useState } from 'react';
+import { FormEvent, KeyboardEvent, memo, useCallback, useEffect, useMemo, useState } from 'react';
 import { Link, useSearchParams } from 'react-router-dom';
 import { api } from '../../api/client';
 import type { AccessProtocolStatus, AccessQuery, AccessSummary, AccessThresholdConfig, AccessThresholdUpdate, AccessUnresolvedIdentity, AccessVehicleRow, Page } from '../../api/types';
@@ -62,29 +62,75 @@ function AccessTime({ value, compact = false }: { value?: string; compact?: bool
   return <time className="v2-access-time" dateTime={value} title={`${formatAccessTime(value)} · 上海时间`}>{compact ? compactTime(value) : formatAccessTime(value)}</time>;
 }
 
-const ProtocolState = memo(function ProtocolState({ status, detailed = false, protocolLabel }: { status?: AccessProtocolStatus; detailed?: boolean; protocolLabel?: string }) {
+function protocolNeedsAttention(status?: AccessProtocolStatus) {
+  return Boolean(status?.connected && (status.onlineState !== 'online' || status.delayAbnormal));
+}
+
+function protocolPriority(status?: AccessProtocolStatus) {
+  if (status?.connected && status.onlineState !== 'online') return 0;
+  if (status?.connected && status.delayAbnormal) return 1;
+  if (status?.connected) return 2;
+  return 3;
+}
+
+const ProtocolState = memo(function ProtocolState({
+  status,
+  detailed = false,
+  protocolLabel,
+  expanded = false,
+  onToggle
+}: {
+  status?: AccessProtocolStatus;
+  detailed?: boolean;
+  protocolLabel?: string;
+  expanded?: boolean;
+  onToggle?: (protocol: string) => void;
+}) {
   const state = !status?.connected ? 'missing' : status.onlineState;
   const label = state === 'missing' ? '无来源' : state === 'online' ? '在线' : state === 'offline' ? '离线' : state === 'unknown' ? '未知' : '从未上报';
   const color = state === 'online' ? 'green' : state === 'offline' || state === 'unknown' ? 'orange' : 'grey';
   if (detailed) {
+    const protocol = status?.protocol || '未知协议';
+    const evidenceId = `access-protocol-${protocol.toLowerCase().replace(/[^a-z0-9]+/g, '-')}-evidence`;
+    const evidence = status?.firstSeenEvidence || '当前未发现该协议来源';
     return <Card
-      className={`v2-access-protocol-detail is-${state}`}
-      title={<strong>{status?.protocol}</strong>}
+      className={`v2-access-protocol-detail is-${state}${expanded ? ' is-expanded' : ''}`}
+      title={<strong>{protocol}</strong>}
       headerExtraContent={<Tag className={`v2-access-protocol-tag is-${state}`} color={color} type="light" size="small"><i />{label}</Tag>}
       headerLine
       bodyStyle={{ padding: 0 }}
     >
-      <Descriptions className="v2-access-protocol-descriptions" align="left" size="small" data={[
-        { key: '接入厂家', value: status?.provider || '—' },
-        { key: '首次接入', value: <AccessTime value={status?.firstSeenAt} /> },
-        { key: '最新上报', value: <AccessTime value={status?.latestReceivedAt} /> },
-        { key: '当前离线', value: formatSeconds(status?.freshnessSec) },
-        { key: '上报间隔', value: formatSeconds(status?.reportIntervalSec) },
-        { key: '数据延迟', value: <Typography.Text type={status?.delayAbnormal ? 'danger' : 'primary'}>{formatSeconds(status?.dataDelaySec)}</Typography.Text> }
-      ]} />
-      <p className="v2-access-protocol-evidence" title={status?.firstSeenEvidence || '当前未发现该协议来源'}>
-        {status?.firstSeenEvidence || '当前未发现该协议来源'}
-      </p>
+      {status?.connected ? <>
+        <div className="v2-access-protocol-glance" role="group" aria-label={`${protocol} 关键状态`}>
+          <span><small>接入厂家</small><strong title={status.provider || '接入方未维护'}>{status.provider || '接入方未维护'}</strong></span>
+          <span><small>最新上报</small><strong><AccessTime value={status.latestReceivedAt} compact /></strong></span>
+          <span><small>当前离线</small><strong>{formatSeconds(status.freshnessSec)}</strong></span>
+          <span className={status.delayAbnormal ? 'is-danger' : ''}><small>数据延迟</small><strong>{formatSeconds(status.dataDelaySec)}</strong></span>
+        </div>
+        <Button
+          className={`v2-access-protocol-toggle${expanded ? ' is-expanded' : ''}`}
+          theme="borderless"
+          type="tertiary"
+          icon={<IconChevronDown />}
+          iconPosition="right"
+          aria-expanded={expanded}
+          aria-controls={evidenceId}
+          aria-label={`${expanded ? '收起' : '查看'} ${protocol} 完整证据`}
+          onClick={() => onToggle?.(protocol)}
+        >
+          {expanded ? '收起完整证据' : protocolNeedsAttention(status) ? '查看异常证据' : '查看完整证据'}
+        </Button>
+        {expanded ? <div id={evidenceId} className="v2-access-protocol-expanded" role="region" aria-label={`${protocol} 完整接入证据`}>
+          <Descriptions className="v2-access-protocol-descriptions" align="left" size="small" data={[
+            { key: '首次接入', value: <AccessTime value={status.firstSeenAt} /> },
+            { key: '上报间隔', value: formatSeconds(status.reportIntervalSec) }
+          ]} />
+          <p className="v2-access-protocol-evidence" title={evidence}>{evidence}</p>
+        </div> : null}
+      </> : <div className="v2-access-protocol-missing">
+        <span>当前未发现真实接入来源</span>
+        <small>无需展开，待收到该协议报文后自动补充证据。</small>
+      </div>}
     </Card>;
   }
   return <div className={`v2-access-protocol-cell is-${state}`} title={status?.latestReceivedAt ? `最新上报：${formatAccessTime(status.latestReceivedAt)}` : '当前未发现该协议来源'}>
@@ -157,28 +203,39 @@ const AccessVehicleTable = memo(function AccessVehicleTable({ rows, selectedVIN,
   />;
 });
 
-function VehicleInspector({ row, onClose, sheet = false }: { row: AccessVehicleRow; onClose: () => void; sheet?: boolean }) {
+function VehicleInspector({ row, onClose, sheet = false, mobile = false }: { row: AccessVehicleRow; onClose: () => void; sheet?: boolean; mobile?: boolean }) {
+  const protocols = useMemo(() => [...PROTOCOLS].sort((left, right) => protocolPriority(statusByProtocol(row, left)) - protocolPriority(statusByProtocol(row, right))), [row]);
+  const [expandedProtocol, setExpandedProtocol] = useState(() => protocols.find((protocol) => protocolNeedsAttention(statusByProtocol(row, protocol))) || '');
+  const toggleProtocol = useCallback((protocol: string) => {
+    setExpandedProtocol((current) => current === protocol ? '' : protocol);
+  }, []);
+
   return <Card className={`v2-access-inspector-v3${sheet ? ' is-sheet' : ''}`} bodyStyle={{ padding: 0 }}>
     {sheet ? null : <WorkspacePanelHeader className="v2-access-inspector-header" title={row.plate || '未绑定车牌'} description={row.vin} actions={<Button theme="borderless" icon={<IconClose />} onClick={onClose} aria-label="关闭车辆接入详情" />} />}
     <Card className={`v2-access-inspector-focus is-${row.connectionState}`} bodyStyle={{ padding: 0 }}>
       <div><small>{row.connectionState === 'healthy' ? '接入结论' : '优先核对'}</small><strong>{accessIssueSummary(row)}</strong><span>{row.actualProtocols.length ? `已发现 ${row.actualProtocols.join(' / ')} ${row.actualProtocols.length} 个真实来源` : '当前没有可用的真实来源证据'}</span></div>
       <ConnectionTag row={row} />
     </Card>
-    <Descriptions className="v2-access-inspector-summary" align="left" size="small" data={[
+    {mobile ? <div className="v2-access-inspector-summary-grid" role="group" aria-label="车辆接入概览">
+      <span><small>品牌 / 车型</small><strong>{[row.oem, row.model].filter(Boolean).join(' / ') || '未维护'}</strong></span>
+      <span><small>真实来源</small><strong>{row.actualProtocols.length ? row.actualProtocols.join(' / ') : '尚无来源'}</strong></span>
+      <span><small>资料状态</small><strong>{row.masterDataIssues.length ? row.masterDataIssues.join('；') : '已维护'}</strong></span>
+    </div> : <Descriptions className="v2-access-inspector-summary" align="left" size="small" data={[
       { key: '品牌 / 车型', value: [row.oem, row.model].filter(Boolean).join(' / ') || '未维护' },
       { key: '真实接入来源', value: row.actualProtocols.length ? row.actualProtocols.join(' / ') : '尚无来源' },
       { key: '资料状态', value: row.masterDataIssues.length ? row.masterDataIssues.join('；') : '已维护' }
-    ]} />
-    <CardGroup className="v2-access-protocol-details" type="grid" spacing={0}>{[...PROTOCOLS].sort((left, right) => {
-      const score = (protocol: string) => {
-        const status = statusByProtocol(row, protocol);
-        if (status?.connected && status.onlineState !== 'online') return 0;
-        if (status?.connected && status.delayAbnormal) return 1;
-        if (status?.connected) return 2;
-        return 3;
-      };
-      return score(left) - score(right);
-    }).map((protocol) => <ProtocolState key={protocol} status={statusByProtocol(row, protocol)} detailed />)}</CardGroup>
+    ]} />}
+    <div className="v2-access-protocol-heading">
+      <span><strong>协议证据</strong><small>异常优先展示，按需展开完整证据</small></span>
+      <Tag color={row.actualProtocols.length ? 'blue' : 'grey'} type="light" size="small">{row.actualProtocols.length} / {PROTOCOLS.length} 已接入</Tag>
+    </div>
+    <CardGroup className="v2-access-protocol-details" type="grid" spacing={0}>{protocols.map((protocol) => <ProtocolState
+      key={protocol}
+      status={statusByProtocol(row, protocol)}
+      detailed
+      expanded={expandedProtocol === protocol}
+      onToggle={toggleProtocol}
+    />)}</CardGroup>
     <footer><span>{row.expectationEvidence}</span><Link to={`/vehicles/${encodeURIComponent(row.vin)}`}>查看车辆详情</Link></footer>
   </Card>;
 }
@@ -349,7 +406,7 @@ export default function AccessPage() {
       title={<div className="v2-access-sheet-title"><strong>车辆接入详情</strong><span>{selected ? `${selected.plate || '未绑定车牌'} · ${selected.vin}` : '来源、在线状态与接入证据'}</span></div>}
       onCancel={() => setSelectedVIN('')}
     >
-      {selected ? <VehicleInspector row={selected} onClose={() => setSelectedVIN('')} sheet /> : null}
+      {selected ? <VehicleInspector key={selected.vin} row={selected} onClose={() => setSelectedVIN('')} sheet mobile={mobileLayout} /> : null}
     </SideSheet>
     {editable ? <SideSheet
       className="v2-access-governance-sidesheet"
diff --git a/vehicle-data-platform/apps/web/src/v2/styles/v2.css b/vehicle-data-platform/apps/web/src/v2/styles/v2.css
index 895838f9..62e4725d 100644
--- a/vehicle-data-platform/apps/web/src/v2/styles/v2.css
+++ b/vehicle-data-platform/apps/web/src/v2/styles/v2.css
@@ -6953,6 +6953,67 @@ button, a { -webkit-tap-highlight-color: transparent; }
 .v2-access-inspector-summary .v2-access-connection span { display: none; }
 .v2-access-inspector-summary .v2-access-connection-tag.semi-tag { flex: 0 0 auto; }
 
+.v2-access-inspector-summary-grid {
+  display: grid;
+  grid-template-columns: 1.25fr 1fr 1fr;
+  border-bottom: 1px solid var(--v2-border);
+  background: #fff;
+  padding: 8px 12px;
+}
+.v2-access-inspector-summary-grid > span {
+  display: grid;
+  min-width: 0;
+  align-content: center;
+  gap: 4px;
+  padding: 3px 9px;
+}
+.v2-access-inspector-summary-grid > span:first-child { padding-left: 0; }
+.v2-access-inspector-summary-grid > span + span { border-left: 1px solid #e8edf3; }
+.v2-access-inspector-summary-grid small {
+  color: #8592a3;
+  font-size: 9px;
+  line-height: 1.2;
+}
+.v2-access-inspector-summary-grid strong {
+  overflow: hidden;
+  color: #3c4e65;
+  font-size: 10px;
+  line-height: 1.35;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.v2-access-protocol-heading {
+  display: flex;
+  min-height: 45px;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  border-bottom: 1px solid #e6ebf2;
+  background: #f7f9fc;
+  padding: 8px 13px 7px;
+}
+.v2-access-protocol-heading > span {
+  display: grid;
+  min-width: 0;
+  gap: 2px;
+}
+.v2-access-protocol-heading strong {
+  color: #34475e;
+  font-size: 12px;
+}
+.v2-access-protocol-heading small {
+  overflow: hidden;
+  color: #8794a5;
+  font-size: 9px;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.v2-access-protocol-heading .semi-tag {
+  min-height: 22px;
+  flex: 0 0 auto;
+  border-radius: 999px;
+  font-size: 9px;
+}
 .v2-access-protocol-details.semi-card-group {
   display: grid;
   grid-template-columns: 1fr;
@@ -6995,6 +7056,56 @@ button, a { -webkit-tap-highlight-color: transparent; }
   border: 1px solid currentColor;
   background: transparent;
 }
+.v2-access-protocol-glance {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 1px;
+  background: #edf1f5;
+}
+.v2-access-protocol-glance > span {
+  display: grid;
+  min-width: 0;
+  min-height: 45px;
+  align-content: center;
+  gap: 3px;
+  background: #fff;
+  padding: 6px 11px;
+}
+.v2-access-protocol-glance small {
+  color: #8793a4;
+  font-size: 9px;
+  line-height: 1.2;
+}
+.v2-access-protocol-glance strong,
+.v2-access-protocol-glance .v2-access-time {
+  overflow: hidden;
+  color: #405269;
+  font-size: 10px;
+  font-weight: 650;
+  line-height: 1.25;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.v2-access-protocol-glance .is-danger strong { color: var(--v2-red); }
+.v2-access-protocol-toggle.semi-button {
+  width: 100%;
+  min-height: 38px;
+  justify-content: space-between;
+  border-top: 1px solid #e9eef4;
+  border-radius: 0;
+  color: #54708e;
+  padding: 0 11px;
+  font-size: 10px;
+  font-weight: 650;
+}
+.v2-access-protocol-toggle .semi-icon {
+  transition: transform .18s ease;
+}
+.v2-access-protocol-toggle.is-expanded .semi-icon { transform: rotate(180deg); }
+.v2-access-protocol-expanded {
+  border-top: 1px solid #e9eef4;
+  background: #fbfcfe;
+}
 .v2-access-protocol-descriptions.semi-descriptions { padding: 7px 11px 3px; }
 .v2-access-protocol-descriptions .semi-descriptions-item {
   min-height: 31px;
@@ -7032,6 +7143,24 @@ button, a { -webkit-tap-highlight-color: transparent; }
   -webkit-box-orient: vertical;
   -webkit-line-clamp: 2;
 }
+.v2-access-protocol-missing {
+  display: grid;
+  min-height: 62px;
+  align-content: center;
+  gap: 4px;
+  background: #fbfcfd;
+  padding: 9px 11px;
+}
+.v2-access-protocol-missing span {
+  color: #627188;
+  font-size: 10px;
+  font-weight: 650;
+}
+.v2-access-protocol-missing small {
+  color: #909bab;
+  font-size: 9px;
+  line-height: 1.4;
+}
 .v2-access-loading {
   position: absolute;
   z-index: 4;
@@ -7066,11 +7195,14 @@ button, a { -webkit-tap-highlight-color: transparent; }
 }
 
 @media (max-width: 680px) {
-  .v2-access-inspector-summary.semi-descriptions { padding: 8px 12px 6px; }
-  .v2-access-inspector-summary .semi-descriptions-item { min-height: 44px; }
-  .v2-access-inspector-summary .semi-descriptions-item-th { width: 80px; }
-  .v2-access-inspector-summary .semi-descriptions-key,
-  .v2-access-inspector-summary .semi-descriptions-value { font-size: 11px; }
+  .v2-access-inspector-summary-grid { min-height: 68px; }
+  .v2-access-inspector-summary-grid > span { padding-inline: 8px; }
+  .v2-access-inspector-summary-grid small { font-size: 10px; }
+  .v2-access-inspector-summary-grid strong { font-size: 11px; }
+  .v2-access-protocol-heading { min-height: 44px; padding-inline: 12px; }
+  .v2-access-protocol-heading strong { font-size: 13px; }
+  .v2-access-protocol-heading small,
+  .v2-access-protocol-heading .semi-tag { font-size: 10px; }
   .v2-access-protocol-details.semi-card-group {
     display: flex;
     overflow-x: auto;
@@ -7086,6 +7218,14 @@ button, a { -webkit-tap-highlight-color: transparent; }
   }
   .v2-access-protocol-detail > .semi-card-header { min-height: 44px; }
   .v2-access-protocol-detail > .semi-card-header .semi-card-header-wrapper-title strong { font-size: 13px; }
+  .v2-access-protocol-glance > span { min-height: 43px; padding-inline: 10px; }
+  .v2-access-protocol-glance small,
+  .v2-access-protocol-glance strong,
+  .v2-access-protocol-glance .v2-access-time,
+  .v2-access-protocol-missing span { font-size: 11px; }
+  .v2-access-protocol-toggle.semi-button { min-height: 42px; font-size: 11px; }
+  .v2-access-protocol-missing { min-height: 66px; }
+  .v2-access-protocol-missing small { font-size: 10px; }
   .v2-access-protocol-descriptions .semi-descriptions-item { min-height: 34px; }
   .v2-access-protocol-descriptions .semi-descriptions-key,
   .v2-access-protocol-descriptions .semi-descriptions-value,