diff --git a/src/App.vue b/src/App.vue
index f1e28b3..e4d64dc 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -11,6 +11,9 @@ const palette: PaletteItem[] = [...elements]
 const viewportRef = ref<HTMLDivElement | null>(null)
 const worldRef = ref<HTMLDivElement | null>(null)
 
+// 右侧 AI 面板显示开关
+const showAI = ref(true)
+
 const state = reactive({
   scale: 1,
   minScale: 0.2,
@@ -277,6 +280,39 @@ function isNearest(instId: string, cpIndex: number) {
   return !!n && n.instId === instId && n.cpIndex === cpIndex
 }
 
+// 悬停端点与其连通集高亮
+const hoveredEndpoint = ref<EndpointRef | null>(null)
+const connectedEndpointSet = computed<Set<string>>(() => {
+  const set = new Set<string>()
+  const start = hoveredEndpoint.value
+  if (!start) return set
+  // 构建无向邻接表（仅基于导线）
+  const key = (ep: EndpointRef) => `${ep.instId}:${ep.cpIndex}`
+  const adj = new Map<string, string[]>()
+  const add = (a: EndpointRef, b: EndpointRef) => {
+    const ka = key(a), kb = key(b)
+    if (!adj.has(ka)) adj.set(ka, [])
+    if (!adj.has(kb)) adj.set(kb, [])
+    adj.get(ka)!.push(kb)
+    adj.get(kb)!.push(ka)
+  }
+  for (const w of wires) add(w.a, w.b)
+  // BFS/DFS 查找连通端点
+  const startKey = key(start)
+  const stack = [startKey]
+  set.add(startKey)
+  while (stack.length) {
+    const cur = stack.pop()!
+    for (const nxt of adj.get(cur) || []) {
+      if (!set.has(nxt)) { set.add(nxt); stack.push(nxt) }
+    }
+  }
+  return set
+})
+function isConnectedEndpoint(instId: string, cpIndex: number) {
+  return connectedEndpointSet.value.has(`${instId}:${cpIndex}`)
+}
+
 // 7.5) 直流电路求解（MNA）
 // - 支持：电压源(battery)、电阻(resistor/light_bulb/meter)、开关(ON=0V源，OFF=断开)、电感(DC=0V源)、电容(DC=断开)
 // - 结果：每个实例的端口电压差与电流（方向：从连接点0 -> 连接点1 为正）
@@ -861,7 +897,7 @@ function deleteSelected() {
 </script>
 
 <template>
-  <div class="app">
+  <div class="app" :style="{ '--ai-width': showAI ? '360px' : '0px' }">
     <!-- 左侧元件面板 -->
     <aside class="sidebar">
       <h2>元件</h2>
@@ -972,23 +1008,28 @@ function deleteSelected() {
             :key="inst.id + '-' + idx">
             <div class="endpoint" :class="{
               active: pendingEndpoint && pendingEndpoint.instId === inst.id && pendingEndpoint.cpIndex === idx,
-              hover: isNearest(inst.id, idx)
+              hover: isNearest(inst.id, idx),
+              connected: hoveredEndpoint && isConnectedEndpoint(inst.id, idx)
             }" :style="{
                   left: getConnectionPointWorldPos(inst, idx).x + 'px',
                   top: getConnectionPointWorldPos(inst, idx).y + 'px'
-                }" @click.stop="(e) => onEndpointClick(inst.id, idx, e)" :title="cp.name || ('P' + (idx + 1))"></div>
+                }" @click.stop="(e) => onEndpointClick(inst.id, idx, e)"
+                @mouseenter="() => { hoveredEndpoint = { instId: inst.id, cpIndex: idx } }"
+                @mouseleave="() => { if (hoveredEndpoint && hoveredEndpoint.instId === inst.id && hoveredEndpoint.cpIndex === idx) hoveredEndpoint = null }"
+                :title="cp.name || ('P' + (idx + 1))"></div>
           </template>
         </div>
       </div>
     </main>
 
     <!-- 右侧 AI 助手面板 -->
-    <aside class="ai-aside">
-      <AIAssistant :state="aiState" @error="onAiError" />
+    <aside v-if="showAI" class="ai-aside">
+      <AIAssistant :state="aiState" @error="onAiError" @close="showAI = false" />
     </aside>
+    <button v-else class="ai-reopen" title="打开 AI 助手" @click="showAI = true">◀</button>
 
     <!-- 底部属性面板：编辑选中元件的业务属性（非尺寸） -->
-  <footer v-if="selectedInst" class="bottom-panel">
+  <footer v-if="selectedInst" class="bottom-panel" :style="{ right: showAI ? '360px' : '0' }">
       <div class="panel-inner">
         <div class="prop-title">{{ selectedInst.key }} 属性</div>
         <!-- 预设按钮区域：显示当前元件的预设，点击一键应用 -->
@@ -1044,7 +1085,7 @@ function deleteSelected() {
 <style scoped>
 .app {
   display: grid;
-  grid-template-columns: 140px 1fr 360px; /* 左栏 / 画布 / AI 辅助 */
+  grid-template-columns: 140px 1fr var(--ai-width, 360px); /* 左栏 / 画布 / AI 辅助 */
   grid-template-rows: 100vh;
   overflow: hidden;
 }
@@ -1159,6 +1200,23 @@ function deleteSelected() {
   overflow: hidden;
 }
 
+/* 右侧重新打开箭头按钮（在隐藏时显示） */
+.ai-reopen {
+  position: fixed;
+  right: 8px;
+  top: 50%;
+  transform: translateY(-50%);
+  z-index: 10;
+  padding: 8px 10px;
+  border: 1px solid #e5e7eb;
+  border-radius: 999px 0 0 999px;
+  background: #fff;
+  color: #111827;
+  cursor: pointer;
+  box-shadow: 0 1px 2px rgba(0,0,0,0.08);
+}
+.ai-reopen:hover { background: #f3f4f6; }
+
 .world {
   position: absolute;
   left: 0;
@@ -1284,11 +1342,18 @@ function deleteSelected() {
   transform: translate(-50%, -50%) scale(1.25);
 }
 
+/* 连通端点高亮：当某端点悬停时，其所有通过导线连通的端点以强调色显示 */
+.endpoint.connected {
+  border-color: #10b981; /* teal-500 */
+  background: #ecfdf5;   /* teal-50 */
+  transform: translate(-50%, -50%) scale(1.25);
+}
+
 .bottom-panel {
   position: fixed;
   left: 140px;
   /* 与左侧栏对齐 */
-  right: 360px; /* 让出 AI 侧栏宽度 */
+  right: 360px; /* 默认让出 AI 侧栏宽度，实际由内联样式覆盖 */
   bottom: 0;
   background: #f9fafb;
   border-top: 1px solid #e5e7eb;
diff --git a/src/components/AIAssistant.vue b/src/components/AIAssistant.vue
index 7361952..e54fcca 100644
--- a/src/components/AIAssistant.vue
+++ b/src/components/AIAssistant.vue
@@ -11,6 +11,7 @@ const props = defineProps<{
 // 向父组件发出事件：可选，用于保存/载入 AI 偏好设置
 const emit = defineEmits<{
     (e: 'error', err: string): void
+    (e: 'close'): void
 }>()
 
 let client: OpenAI = new OpenAI({
@@ -109,6 +110,7 @@ onMounted(() => nextTick(scrollToBottom))
     <div class="ai-panel">
         <header class="ai-header">
             <div class="title">AI 助手</div>
+            <button class="close-btn" title="关闭" @click="emit('close')">×</button>
         </header>
 
         <div class="chat-list" ref="listRef">
@@ -152,6 +154,18 @@ onMounted(() => nextTick(scrollToBottom))
     color: #111827;
 }
 
+.close-btn {
+    padding: 4px 8px;
+    border: 1px solid #d1d5db;
+    border-radius: 6px;
+    background: #fff;
+    color: #111827;
+    cursor: pointer;
+    font-weight: 700;
+    line-height: 1;
+}
+.close-btn:hover { background: #f3f4f6; }
+
 .key-box {
     flex: 1;
     display: flex;