diff --git a/data/wiki/guanghan_topology_demo.html b/data/wiki/guanghan_topology_demo.html
index 39b5c68..57ecd5d 100644
--- a/data/wiki/guanghan_topology_demo.html
+++ b/data/wiki/guanghan_topology_demo.html
@@ -147,7 +147,24 @@
 const API_BASE = '';
 const SVG_NS = 'http://www.w3.org/2000/svg';
 const TYPE_LABELS = { module: '舱段模块', node: '结构节点', vehicle: '着陆器/车辆', equipment: '设备模块' };
+const ANCHOR_LABELS = {
+  explicit_time: '明确时间',
+  mission_latest_event: '任务末条记录',
+  latest_recorded_state: '最新已记录状态',
+  no_events: '暂无记录',
+};
+const TIME_FORMATTER = new Intl.DateTimeFormat('zh-CN', {
+  timeZone: 'Asia/Shanghai',
+  year: 'numeric',
+  month: '2-digit',
+  day: '2-digit',
+  hour: '2-digit',
+  minute: '2-digit',
+  second: '2-digit',
+  hour12: false,
+});
 let currentData = null;
+let lastModalTrigger = null;
 
 function svgElement(name, attributes = {}) {
   const element = document.createElementNS(SVG_NS, name);
@@ -160,17 +177,50 @@ function svgElement(name, attributes = {}) {
 async function fetchSnapshot(mission, at) {
   const params = new URLSearchParams();
   if (at) params.set('at', at);
-  else if (mission) params.set('mission', mission);
+  if (mission) params.set('mission', mission);
   const response = await fetch(`${API_BASE}/api/v1/bases/guanghan/snapshot?${params}`);
   if (!response.ok) {
-    const error = await response.json();
+    let error;
+    try {
+      error = await response.json();
+    } catch {
+      error = { message: `HTTP ${response.status}` };
+    }
     throw new Error(error.message || `HTTP ${response.status}`);
   }
   return response.json();
 }
 
 async function loadMissions() {
-  return ['BL-01', 'GHC-01', 'JC-01', 'BL-02', 'GHC-02', 'GHC-03', 'BL-03', 'GHC-04', 'GHC-05'];
+  const response = await fetch(`${API_BASE}/api/v1/bases/guanghan/missions`);
+  if (!response.ok) throw new Error(`任务列表加载失败（HTTP ${response.status}）`);
+  return (await response.json()).missions;
+}
+
+function formatSnapshotTime(value) {
+  return value ? TIME_FORMATTER.format(new Date(value)) : '—';
+}
+
+function isValidTimeInput(value) {
+  if (!value) return true;
+  if (!/(Z|[+-]\d{2}:\d{2})$/.test(value)) return false;
+  return !Number.isNaN(Date.parse(value));
+}
+
+function setError(message) {
+  const error = document.getElementById('error-msg');
+  error.textContent = message;
+  error.style.display = message ? 'block' : 'none';
+}
+
+function setLines(elementId, lines, fallback) {
+  const container = document.getElementById(elementId);
+  const values = lines.length ? lines : [fallback];
+  container.replaceChildren(...values.map(value => {
+    const line = document.createElement('span');
+    line.textContent = value;
+    return line;
+  }));
 }
 
 function splitEndpoint(endpoint) {
@@ -337,11 +387,11 @@ function renderTopology() {
       appendNodeText(group, node, 'node-title', title, node.y + node.height * (hasHint ? 0.34 : 0.42));
       appendNodeText(group, node, 'node-meta', node.displayMeta, node.y + node.height * (hasHint ? 0.60 : 0.72));
       appendNodeText(group, node, 'node-hint', node.displayHint, node.y + node.height * 0.82);
-      group.addEventListener('click', () => openModal(node.nodeKey));
+      group.addEventListener('click', () => openModal(node.nodeKey, group));
       group.addEventListener('keydown', event => {
         if (event.key === 'Enter' || event.key === ' ') {
           event.preventDefault();
-          openModal(node.nodeKey);
+          openModal(node.nodeKey, group);
         }
       });
       nodeLayer.appendChild(group);
@@ -381,7 +431,7 @@ function buildConnectionsForComponent(componentKey) {
   return result;
 }
 
-function openModal(nodeKey) {
+function openModal(nodeKey, trigger = null) {
   const components = getNodeComponents(nodeKey);
   if (components.length === 0) return;
   const primary = components[0];
@@ -425,8 +475,7 @@ function openModal(nodeKey) {
     if (values.length) metrics.push(`${component.name}：${values.join('，')}`);
     else if (components.length > 1 && component.summary) metrics.push(`${component.name}：${component.summary}`);
   });
-  document.getElementById('detail-metrics').innerHTML =
-    metrics.map(value => `<span>${value}</span>`).join('') || '<span>资料未记录</span>';
+  setLines('detail-metrics', metrics, '资料未记录');
 
   const dimensionLines = [];
   components.forEach(component => {
@@ -438,8 +487,7 @@ function openModal(nodeKey) {
     if (dimensions.diameterM) values.push(`直径 ${dimensions.diameterM} m`);
     if (values.length) dimensionLines.push(`${component.name}：${values.join('，')}`);
   });
-  document.getElementById('detail-dimensions').innerHTML =
-    dimensionLines.map(value => `<span>${value}</span>`).join('') || '<span>资料未记录</span>';
+  setLines('detail-dimensions', dimensionLines, '资料未记录');
 
   const connections = [];
   components.forEach(component => {
@@ -447,12 +495,14 @@ function openModal(nodeKey) {
       if (!connections.includes(value)) connections.push(value);
     });
   });
-  document.getElementById('detail-connections').innerHTML =
-    connections.map(value => `<span>${value}</span>`).join('') || '<span>无连接记录</span>';
-  document.getElementById('detail-mission').textContent =
-    primary.detailUrl ? `详见 Wiki：${primary.detailUrl}` : '资料未记录';
+  setLines('detail-connections', connections, '无连接记录');
+  const missions = components.map(component =>
+    `${component.name}：${component.introducedMission} · ${formatSnapshotTime(component.introducedAt)}`
+  );
+  setLines('detail-mission', missions, '资料未记录');
 
   const modal = document.getElementById('detail-modal');
+  lastModalTrigger = trigger;
   modal.setAttribute('aria-hidden', 'false');
   document.body.classList.add('modal-open');
   modal.querySelector('.detail-dialog').focus();
@@ -461,11 +511,13 @@ function openModal(nodeKey) {
 function closeModal() {
   document.getElementById('detail-modal').setAttribute('aria-hidden', 'true');
   document.body.classList.remove('modal-open');
+  if (lastModalTrigger?.isConnected) lastModalTrigger.focus();
+  lastModalTrigger = null;
 }
 
 async function load(mission, at) {
   document.getElementById('loading-msg').style.display = 'block';
-  document.getElementById('error-msg').style.display = 'none';
+  setError('');
   document.getElementById('map-shell').style.display = 'none';
   try {
     currentData = await fetchSnapshot(mission, at);
@@ -473,15 +525,14 @@ async function load(mission, at) {
     const query = currentData.query;
     const missionLabel = query.requestedMission || '(最新)';
     document.getElementById('page-subtitle').textContent =
-      `${missionLabel} · 快照时间: ${new Date(query.snapshotAt).toLocaleString('zh-CN')} · ${currentData.components.length} 组件`;
+      `${missionLabel} · 快照时间: ${formatSnapshotTime(query.snapshotAt)} · ${currentData.components.length} 组件`;
     document.getElementById('snapshot-info').textContent =
-      `快照: ${query.snapshotAt ? new Date(query.snapshotAt).toLocaleString('zh-CN') : '—'} · ${query.anchorSource}`;
+      `快照: ${formatSnapshotTime(query.snapshotAt)} · ${ANCHOR_LABELS[query.anchorSource] || query.anchorSource}`;
     document.getElementById('loading-msg').style.display = 'none';
     document.getElementById('map-shell').style.display = 'block';
   } catch (error) {
     document.getElementById('loading-msg').style.display = 'none';
-    document.getElementById('error-msg').style.display = 'block';
-    document.getElementById('error-msg').textContent = `加载失败: ${error.message}`;
+    setError(`加载失败: ${error.message}`);
   }
 }
 
@@ -490,27 +541,36 @@ async function load(mission, at) {
   const missions = await loadMissions();
   missions.forEach(mission => {
     const option = document.createElement('option');
-    option.value = mission;
-    option.textContent = mission;
+    option.value = mission.code;
+    option.textContent = mission.code;
     missionSelect.appendChild(option);
   });
 
-  const urlParams = new URLSearchParams(window.location.search);
-  const urlMission = urlParams.get('mission');
-  const urlAt = urlParams.get('at');
-  if (urlMission) missionSelect.value = urlMission;
-  if (urlAt) document.getElementById('time-input').value = urlAt;
-  await load(urlMission || null, urlAt || null);
+  async function applyUrlState() {
+    const urlParams = new URLSearchParams(window.location.search);
+    const mission = urlParams.get('mission') || '';
+    const at = urlParams.get('at') || '';
+    missionSelect.value = mission;
+    document.getElementById('time-input').value = at;
+    await load(mission || null, at || null);
+  }
+
+  await applyUrlState();
 
   document.getElementById('go-btn').addEventListener('click', () => {
     const mission = missionSelect.value || null;
     const at = document.getElementById('time-input').value || null;
+    if (!isValidTimeInput(at)) {
+      setError('请输入带时区的 ISO 8601 时间，例如 2025-01-02T08:00:00+08:00。');
+      return;
+    }
     const params = new URLSearchParams();
     if (mission) params.set('mission', mission);
     if (at) params.set('at', at);
     window.history.pushState({}, '', `${window.location.pathname}${params.size ? `?${params}` : ''}`);
     load(mission, at);
   });
+  window.addEventListener('popstate', applyUrlState);
 
   document.getElementById('detail-modal').addEventListener('click', event => {
     if (event.target === event.currentTarget) closeModal();
diff --git a/tests/test_guanghan_topology_demo.py b/tests/test_guanghan_topology_demo.py
index ff46a9c..981a33f 100644
--- a/tests/test_guanghan_topology_demo.py
+++ b/tests/test_guanghan_topology_demo.py
@@ -40,6 +40,14 @@ class GuanghanTopologySourceTests(unittest.TestCase):
         self.assertIn("const API_BASE = ''", self.html)
         self.assertNotIn("http://localhost:5000", self.html)
 
+    def test_controls_use_api_navigation_and_safe_text(self) -> None:
+        self.assertIn("/api/v1/bases/guanghan/missions", self.html)
+        self.assertNotIn("return ['BL-01'", self.html)
+        self.assertIn("popstate", self.html)
+        self.assertIn("Asia/Shanghai", self.html)
+        self.assertNotIn(".innerHTML =", self.html)
+        self.assertIn("replaceChildren", self.html)
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/tests/test_guanghan_topology_e2e.py b/tests/test_guanghan_topology_e2e.py
index 5177df9..820f022 100644
--- a/tests/test_guanghan_topology_e2e.py
+++ b/tests/test_guanghan_topology_e2e.py
@@ -115,6 +115,110 @@ class GuanghanTopologyE2ETests(unittest.TestCase):
         with topology_server() as base_url:
             asyncio.run(scenario(base_url))
 
+    def test_controls_navigation_and_modal_semantics(self) -> None:
+        async def scenario(base_url: str) -> None:
+            async with async_playwright() as pw:
+                browser = await pw.chromium.launch(headless=True)
+                page = await browser.new_page(
+                    viewport={"width": 1440, "height": 1000}
+                )
+                await page.goto(
+                    f"{base_url}/guanghan_topology_demo.html"
+                    "?mission=GHC-05",
+                    wait_until="networkidle",
+                )
+                await page.wait_for_function(
+                    """() => document.querySelectorAll(
+                        '.topology-node'
+                    ).length === 14"""
+                )
+
+                options = await page.locator(
+                    "#mission-select option"
+                ).evaluate_all("(items) => items.map(item => item.value)")
+                self.assertEqual(
+                    options,
+                    [
+                        "",
+                        "BL-01",
+                        "GHC-01",
+                        "JC-01",
+                        "BL-02",
+                        "GHC-02",
+                        "GHC-03",
+                        "BL-03",
+                        "GHC-04",
+                        "GHC-05",
+                    ],
+                )
+
+                core = page.locator(
+                    '.topology-node[data-node-key="core_cabin"]'
+                )
+                await core.click()
+                self.assertIn(
+                    "GHC-01",
+                    await page.locator("#detail-mission").inner_text(),
+                )
+                await page.locator(".modal-close").click()
+                self.assertEqual(
+                    await page.evaluate(
+                        "() => document.activeElement?.dataset.nodeKey"
+                    ),
+                    "core_cabin",
+                )
+
+                await page.select_option("#mission-select", "GHC-01")
+                await page.fill(
+                    "#time-input",
+                    "2025-01-02T08:00:00+08:00",
+                )
+                await page.locator("#go-btn").click()
+                await page.wait_for_function(
+                    """() => document.querySelector('#snapshot-info')
+                        ?.textContent.includes('明确时间')"""
+                )
+                self.assertTrue(
+                    (await page.locator("#page-subtitle").inner_text())
+                    .startswith("GHC-01 ·")
+                )
+                self.assertIn("mission=GHC-01", page.url)
+                self.assertIn("at=", page.url)
+
+                await page.fill("#time-input", "not-a-time")
+                await page.locator("#go-btn").click()
+                self.assertIn(
+                    "请输入带时区的 ISO 8601 时间",
+                    await page.locator("#error-msg").inner_text(),
+                )
+
+                await page.fill("#time-input", "")
+                await page.select_option("#mission-select", "GHC-01")
+                await page.locator("#go-btn").click()
+                await page.wait_for_function(
+                    """() => document.querySelector('#page-subtitle')
+                        ?.textContent.startsWith('GHC-01 ·')"""
+                )
+                await page.select_option("#mission-select", "GHC-05")
+                await page.locator("#go-btn").click()
+                await page.wait_for_function(
+                    """() => document.querySelector('#page-subtitle')
+                        ?.textContent.startsWith('GHC-05 ·')"""
+                )
+                await page.go_back()
+                await page.wait_for_function(
+                    """() => document.querySelector('#page-subtitle')
+                        ?.textContent.startsWith('GHC-01 ·')"""
+                )
+                self.assertEqual(
+                    await page.locator("#mission-select").input_value(),
+                    "GHC-01",
+                )
+                await browser.close()
+
+        with topology_server() as base_url:
+            asyncio.run(scenario(base_url))
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/tests/test_topology_api.py b/tests/test_topology_api.py
index ec88b6d..628eeb0 100644
--- a/tests/test_topology_api.py
+++ b/tests/test_topology_api.py
@@ -181,6 +181,25 @@ class TopologyApiQueryTests(unittest.TestCase):
             },
         )
 
+    def test_components_include_introduction_mission_and_time(self) -> None:
+        response = self.client.get(
+            "/api/v1/bases/guanghan/snapshot?mission=GHC-05"
+        )
+        components = {
+            component["key"]: component
+            for component in response.get_json()["components"]
+        }
+        self.assertEqual(
+            components["core_cabin"]["introducedMission"],
+            "GHC-01",
+        )
+        self.assertEqual(
+            datetime.fromisoformat(
+                components["core_cabin"]["introducedAt"]
+            ).astimezone(timezone.utc),
+            datetime.fromisoformat("2024-06-16T07:23:00+00:00"),
+        )
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/topology_api/queries/snapshot_queries.py b/topology_api/queries/snapshot_queries.py
index 6adb16b..a6c6604 100644
--- a/topology_api/queries/snapshot_queries.py
+++ b/topology_api/queries/snapshot_queries.py
@@ -112,10 +112,14 @@ def fetch_snapshot(snapshot_at):
                 cv.diameter_m,
                 cv.mass_t,
                 cv.detail_url,
-                cv.properties
+                cv.properties,
+                intro_mission.code AS introduced_mission,
+                e_intro.effective_at AS introduced_at
             FROM components c
             JOIN mission_events e_intro
                 ON e_intro.id = c.introduced_by_event_id
+            JOIN missions intro_mission
+                ON intro_mission.id = e_intro.mission_id
             LEFT JOIN mission_events e_retire
                 ON e_retire.id = c.retired_by_event_id
             LEFT JOIN LATERAL (
@@ -144,6 +148,8 @@ def fetch_snapshot(snapshot_at):
                 "summary": row["summary"],
                 "description": row["description"],
                 "detailUrl": row["detail_url"],
+                "introducedMission": row["introduced_mission"],
+                "introducedAt": row["introduced_at"].isoformat(),
                 "dimensions": {},
                 "properties": row["properties"] or {},
                 "ports": [],