diff --git a/backend/app/api/maps.py b/backend/app/api/maps.py
index 20566514..04043a50 100644
--- a/backend/app/api/maps.py
+++ b/backend/app/api/maps.py
@@ -186,7 +186,13 @@ def add_connection(map_id: int, data: dict, db: Session = Depends(get_db)):
         if c.get("from") == from_id and c.get("to") == to_id:
             raise HTTPException(400, "已存在相同的连线")
 
-    conns.append({"from": from_id, "to": to_id, "style": "solid"})
+    conns.append({
+        "from": from_id,
+        "to": to_id,
+        "style": "solid",
+        "effect": data.get("effect", "positive"),
+        "label": data.get("label", ""),
+    })
     m.canvas_data["connections"] = conns
     db.commit()
     return {"connections": conns}
@@ -418,13 +424,13 @@ def get_map_review(map_id: int, level: Optional[str] = None, db: Session = Depen
                 lv = latest_values.get(kpi_def.id, {})
                 actual = lv.get("actual_value")
                 target = kpi_def.target_value
-                # 判断红黄绿灯
+                # 判断红黄绿灯（绿≥90% / 黄60-90% / 红<60%）
                 level = "gray"
                 if actual is not None and target:
                     ratio = actual / target
                     if ratio >= 0.9:
                         level = "green"
-                    elif ratio >= 0.7:
+                    elif ratio >= 0.6:
                         level = "yellow"
                     else:
                         level = "red"
diff --git a/frontend/src/components/map-canvas/MapCanvasToolbar.vue b/frontend/src/components/map-canvas/MapCanvasToolbar.vue
index bd9650e4..08ac1cc6 100644
--- a/frontend/src/components/map-canvas/MapCanvasToolbar.vue
+++ b/frontend/src/components/map-canvas/MapCanvasToolbar.vue
@@ -23,6 +23,12 @@
           <input type="radio" :checked="viewDirection === 'causal'" @change="$emit('update:viewDirection', 'causal')" /> 🔗 因果
         </label>
       </span>
+      <el-button
+        :type="chainMode ? 'warning' : 'default'"
+        :class="{ 'chain-mode-on': chainMode }"
+        @click="$emit('toggle-chain-mode')"
+        title="点击节点可聚焦查看其相关因果链，其余自动变淡"
+      >🔍 因果链查看{{ chainMode ? '中' : '' }}</el-button>
       <el-button @click="$emit('show-causality')">🔗 因果链推荐</el-button>
       <el-button type="primary" @click="$emit('save-canvas')">保存</el-button>
       <el-button type="success" @click="$emit('publish-map')" v-if="currentMap?.status === 'draft'">发布</el-button>
@@ -54,6 +60,7 @@ const props = defineProps<{
   viewDirection: string
   currentMap: any
   linkingFrom: { key: string; obj: any } | null
+  chainMode: boolean
 }>()
 
 const emit = defineEmits<{
@@ -70,6 +77,7 @@ const emit = defineEmits<{
   (e: 'show-versions'): void
   (e: 'go-alignment'): void
   (e: 'cancel-link'): void
+  (e: 'toggle-chain-mode'): void
 }>()
 
 const selectedMapLocal = ref(props.selectedMap)
diff --git a/frontend/src/components/strategy-map/ConnectionLines.vue b/frontend/src/components/strategy-map/ConnectionLines.vue
index 0e20fbc2..d88962cd 100644
--- a/frontend/src/components/strategy-map/ConnectionLines.vue
+++ b/frontend/src/components/strategy-map/ConnectionLines.vue
@@ -1,15 +1,18 @@
 <template>
   <svg class="connection-svg" ref="svgRef">
     <defs>
-      <marker id="arrowhead" markerWidth="10" markerHeight="7" refX="10" refY="3.5" orient="auto">
+      <marker id="arrowhead" markerWidth="10" markerHeight="7" refX="8" refY="3.5" orient="auto">
         <polygon points="0 0, 10 3.5, 0 7" fill="#409eff" />
       </marker>
-      <marker id="arrowhead-warn" markerWidth="10" markerHeight="7" refX="10" refY="3.5" orient="auto">
+      <marker id="arrowhead-warn" markerWidth="10" markerHeight="7" refX="8" refY="3.5" orient="auto">
         <polygon points="0 0, 10 3.5, 0 7" fill="#e6a23c" />
       </marker>
+      <marker id="arrowhead-red" markerWidth="10" markerHeight="7" refX="8" refY="3.5" orient="auto">
+        <polygon points="0 0, 10 3.5, 0 7" fill="#f56c6c" />
+      </marker>
     </defs>
 
-    <!-- 固定跨层箭头：从下层泳道到上层泳道（因果连线） -->
+    <!-- 固定跨层箭头：贝塞尔曲线（从下层泳道到上层泳道） -->
     <path
       v-for="(arrow, idx) in fixedLayerArrows"
       :key="'fixed-' + idx"
@@ -24,20 +27,43 @@
       <title>{{ arrow.from }} → {{ arrow.to }}</title>
     </path>
 
-    <!-- 用户自定义连线 -->
-    <line
-      v-for="(line, idx) in connectionLines"
-      :key="'conn-' + idx"
-      :x1="line.x1" :y1="line.y1" :x2="line.x2" :y2="line.y2"
-      :class="['conn-line', { 'conn-selected': selectedConnIdx === idx }]"
-      :style="{ '--from-color': line.fromColor, '--to-color': line.toColor }"
-      marker-end="url(#arrowhead)"
-      :stroke="selectedConnIdx === idx ? '#f56c6c' : '#409eff'"
-      :stroke-width="selectedConnIdx === idx ? 3 : 2"
-      @click.stop="$emit('select-connection', idx)"
-      @mouseenter="hoverConnIdx = idx"
-      @mouseleave="hoverConnIdx = null"
-    />
+    <!-- 用户自定义连线：贝塞尔曲线 + 语义样式 + 因果链高亮 -->
+    <g v-for="(line, idx) in connectionLines" :key="'conn-' + idx">
+      <path
+        :d="line.path"
+        :class="['conn-line', {
+          'conn-selected': selectedConnIdx === idx,
+          'conn-chain': chainActive && chainConnIdxs.includes(idx),
+          'conn-dim': chainActive && !chainConnIdxs.includes(idx),
+        }]"
+        :style="{ '--from-color': line.fromColor, '--to-color': line.toColor }"
+        :stroke="strokeFor(line, idx)"
+        :stroke-width="selectedConnIdx === idx ? 3 : (chainActive && chainConnIdxs.includes(idx) ? 3.5 : 2)"
+        :stroke-dasharray="isNegative(line) ? '7,4' : 'none'"
+        fill="none"
+        :marker-end="markerFor(line, idx)"
+        @click.stop="$emit('select-connection', idx)"
+        @mouseenter="onConnEnter(idx)"
+        @mouseleave="onConnLeave"
+      />
+      <!-- 连线语义标签 -->
+      <g
+        v-if="line.label"
+        :class="['conn-label', { 'conn-label-dim': chainActive && !chainConnIdxs.includes(idx) }]"
+        @click.stop="$emit('select-connection', idx)"
+      >
+        <rect
+          :x="line.mx - labelW(line) / 2"
+          :y="line.my - 22"
+          :width="labelW(line)"
+          height="16"
+          rx="8"
+          class="conn-label-bg"
+          :style="{ '--label-color': isNegative(line) ? '#f56c6c' : '#409eff' }"
+        />
+        <text :x="line.mx" :y="line.my - 10.5" text-anchor="middle" font-size="10.5" class="conn-label-text">{{ line.label }}</text>
+      </g>
+    </g>
 
     <!-- 连线提示浮层 -->
     <g v-if="hoverConnIdx !== null && connectionLines[hoverConnIdx] && hoverConnIdx !== selectedConnIdx">
@@ -45,11 +71,13 @@
         :x="connectionLines[hoverConnIdx].mx - 60"
         :y="connectionLines[hoverConnIdx].my - 36"
         width="120" height="22" rx="4" fill="rgba(0,0,0,0.65)"
+        class="conn-hover-bg"
       />
       <text
         :x="connectionLines[hoverConnIdx].mx"
         :y="connectionLines[hoverConnIdx].my - 21"
         text-anchor="middle" fill="#fff" font-size="11"
+        class="conn-hover-text"
       >点击选中连线</text>
     </g>
 
@@ -71,10 +99,13 @@
     </g>
 
     <!-- 绘制中的临时线 -->
-    <line v-if="tempLine"
-      :x1="tempLine.x1" :y1="tempLine.y1"
-      :x2="tempLine.x2" :y2="tempLine.y2"
-      stroke="#e6a23c" stroke-width="2" stroke-dasharray="6,3"
+    <path
+      v-if="tempLine"
+      :d="tempLinePath"
+      fill="none"
+      stroke="#e6a23c"
+      stroke-width="2"
+      stroke-dasharray="6,3"
       marker-end="url(#arrowhead-warn)"
     />
   </svg>
@@ -82,6 +113,7 @@
 
 <script setup lang="ts">
 import { ref, computed } from 'vue'
+import { getChainForConnection } from '../../utils/chainGraph'
 
 const props = defineProps<{
   connectionLines: any[]
@@ -93,10 +125,66 @@ const props = defineProps<{
 const emit = defineEmits<{
   (e: 'select-connection', idx: number): void
   (e: 'delete-connection', idx: number): void
+  (e: 'chain-hover', nodes: string[] | null): void
 }>()
 
 const svgRef = ref<SVGSVGElement | null>(null)
 const hoverConnIdx = ref<number | null>(null)
+const hoverChain = ref<{ nodes: string[]; connIdxs: number[] } | null>(null)
+
+const chainActive = computed(() => hoverChain.value !== null)
+const chainConnIdxs = computed<number[]>(() => hoverChain.value?.connIdxs || [])
+
+function isNegative(line: any) {
+  return line && line.effect === 'negative'
+}
+
+function strokeFor(line: any, idx: number) {
+  if (selectedConnIdx.value === idx) return '#f56c6c'
+  if (chainActive.value && chainConnIdxs.value.includes(idx)) return '#e6a23c'
+  if (chainActive.value) return '#c0c4cc'
+  return isNegative(line) ? '#f56c6c' : '#409eff'
+}
+
+function markerFor(line: any, idx: number) {
+  if (selectedConnIdx.value === idx) return 'url(#arrowhead-red)'
+  if (chainActive.value && chainConnIdxs.value.includes(idx)) return 'url(#arrowhead-warn)'
+  return isNegative(line) ? 'url(#arrowhead-red)' : 'url(#arrowhead)'
+}
+
+function labelW(line: any) {
+  return (line.label ? line.label.length : 0) * 12 + 16
+}
+
+function onConnEnter(idx: number) {
+  hoverConnIdx.value = idx
+  const chain = getChainForConnection(props.connectionLines.map(toConnLike), idx)
+  hoverChain.value = chain
+  emit('chain-hover', chain ? chain.nodes : null)
+}
+
+function onConnLeave() {
+  hoverConnIdx.value = null
+  hoverChain.value = null
+  emit('chain-hover', null)
+}
+
+/** connectionLines 条目（含 x1/y1/x2/y2）转成 {from,to} 形状供链算法使用 */
+function toConnLike(line: any, idx: number) {
+  const conns = props.connectionLines
+  // 从原数据推断 from/to：算法只需 from/to 字段
+  return {
+    from: line.from || `n-${idx}`,
+    to: line.to || `n-${idx}`,
+  }
+}
+
+const tempLinePath = computed(() => {
+  if (!props.tempLine) return ''
+  const { x1, y1, x2, y2 } = props.tempLine
+  const dx = Math.max(Math.abs(x2 - x1) * 0.5, 40)
+  return `M ${x1} ${y1} C ${x1 + dx} ${y1}, ${x2 - dx} ${y2}, ${x2} ${y2}`
+})
 
 defineExpose({ svgRef })
 </script>
@@ -108,11 +196,17 @@ defineExpose({ svgRef })
   overflow: visible;
 }
 .conn-line {
-  cursor: pointer; transition: stroke .15s, stroke-width .15s;
+  cursor: pointer; transition: stroke .15s, stroke-width .15s, opacity .2s;
   pointer-events: stroke;
 }
 .conn-line:hover { stroke: #e6a23c !important; stroke-width: 4 !important; cursor: pointer; }
+.conn-line.conn-chain { filter: drop-shadow(0 0 3px rgba(230,162,60,0.65)); }
+.conn-line.conn-dim { opacity: 0.25; }
 .conn-selected { stroke: #f56c6c !important; stroke-width: 3; }
+.conn-label { cursor: pointer; pointer-events: all; transition: opacity .2s; }
+.conn-label-dim { opacity: 0.25; }
+.conn-label-bg { fill: rgba(255,255,255,0.92); stroke: var(--label-color, #409eff); stroke-width: 1; }
+.conn-label-text { fill: #303133; font-weight: 600; pointer-events: none; }
 .del-btn-bg { cursor: pointer; pointer-events: all; }
 .del-btn-bg:hover { fill: #e74c3c !important; }
 .del-btn-text { cursor: pointer; pointer-events: all; user-select: none; }
@@ -120,4 +214,8 @@ defineExpose({ svgRef })
   pointer-events: none;
   opacity: 0.5;
 }
+.conn-hover-bg,
+.conn-hover-text {
+  pointer-events: none;
+}
 </style>
diff --git a/frontend/src/components/strategy-map/MapNode.vue b/frontend/src/components/strategy-map/MapNode.vue
index 72e76ddf..ff5cb9de 100644
--- a/frontend/src/components/strategy-map/MapNode.vue
+++ b/frontend/src/components/strategy-map/MapNode.vue
@@ -10,6 +10,7 @@
       'node-level-yellow': level === 'yellow',
       'node-level-green': level === 'green',
       'kr-expanded': krExpanded,
+      'chain-dimmed': chainDimmed,
     }"
     :draggable="draggable"
     @dragstart="onDragStart"
@@ -83,33 +84,37 @@
         @click.stop="$emit('kpi-click', kpi)"
       >{{ getKpiName(kpi) }}</el-tag>
     </div>
-    <!-- KPI达成率迷你进度条 -->
+    <!-- KPI达成率迷你进度条（右下角） -->
     <div v-if="progressData" class="node-progress-bar">
-      <div class="node-progress-fill"
-        :style="{
-          width: Math.max(progressData.ratio, 4) + '%',
-          background: progressColor(progressData.level)
-        }"
-      ></div>
-      <span class="node-progress-text">
+      <span class="node-progress-label">达成率</span>
+      <div class="node-progress-track">
+        <div class="node-progress-fill"
+          :style="{
+            width: Math.max(progressData.ratio, 4) + '%',
+            background: progressColor(progressData.level)
+          }"
+        ></div>
+      </div>
+      <span class="node-progress-text" :style="{ color: progressColor(progressData.level) }">
         {{ progressData.ratio > 0 ? progressData.ratio + '%' : '—' }}
       </span>
     </div>
-    <!-- KPI实际值快照 -->
+    <!-- KPI实际值快照：当前值 / 目标值 / 达成率 -->
     <div v-if="progressData?.kpiList?.length" class="node-kpi-snapshots">
       <div
-        v-for="item in progressData.kpiList.slice(0, 2)" :key="item.code"
+        v-for="item in progressData.kpiList.slice(0, 3)" :key="item.code"
         class="kpi-snapshot-row"
         :class="'snap-' + getKpiLevel(item)"
       >
         <span class="snap-name" :title="item.name">{{ item.name }}</span>
         <span class="snap-value">
-          {{ item.actual != null ? fmtKpiVal(item.actual) : '—' }}
+          <span class="snap-now" :class="'snap-now-' + getKpiLevel(item)">{{ item.actual != null ? fmtKpiVal(item.actual) : '—' }}</span>
           <span class="snap-target">/ {{ item.target != null ? fmtKpiVal(item.target) : '—' }}</span>
         </span>
+        <span class="snap-rate" :class="'rate-' + getKpiLevel(item)">{{ kpiRateText(item) }}</span>
       </div>
-      <div v-if="progressData.kpiList.length > 2" class="kpi-snapshot-more">
-        +{{ progressData.kpiList.length - 2 }} 更多
+      <div v-if="progressData.kpiList.length > 3" class="kpi-snapshot-more">
+        +{{ progressData.kpiList.length - 3 }} 更多
       </div>
     </div>
     <div v-if="progressData?.kpiList?.length" class="node-click-hint">点击查看KPI详情</div>
@@ -152,6 +157,8 @@ const props = defineProps<{
   iconMap?: Record<string, string>
   kpiNameMap?: Record<string, string>
   allKpis?: any[]
+  /** 因果链查看模式下不在链上 → 变淡 */
+  chainDimmed?: boolean
 }>()
 
 const emit = defineEmits<{
@@ -202,12 +209,19 @@ function getKpiLevel(item: any): string {
   if (item.actual != null && item.target) {
     const ratio = item.actual / item.target
     if (ratio >= 0.9) return 'green'
-    if (ratio >= 0.7) return 'yellow'
+    if (ratio >= 0.6) return 'yellow'
     return 'red'
   }
   return 'gray'
 }
 
+/** KPI达成率文本（绿≥90% / 黄60-90% / 红<60%） */
+function kpiRateText(item: any): string {
+  if (item.actual == null || !item.target) return '—'
+  const ratio = item.actual / item.target
+  return Math.round(ratio * 100) + '%'
+}
+
 function fmtKpiVal(val: any): string {
   if (val == null) return '—'
   if (typeof val === 'number') {
@@ -259,6 +273,11 @@ function getKrProgressText(kr: any): string {
   transition: all 0.2s; position: relative;
 }
 .map-node:hover { box-shadow: 0 2px 10px rgba(0,0,0,0.08); }
+.map-node.chain-dimmed {
+  opacity: 0.3;
+  filter: saturate(0.35);
+  pointer-events: auto;
+}
 .map-node.linking-source {
   border-color: #e6a23c; box-shadow: 0 0 0 2px rgba(230,162,60,0.3);
 }
@@ -289,9 +308,26 @@ function getKrProgressText(kr: any): string {
 .snap-yellow { background: #fdf6ec; }
 .snap-red { background: #fef0f0; }
 .snap-gray { background: #f5f5f5; }
-.snap-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 100px; color: #666; }
-.snap-value { font-weight: 600; color: #333; white-space: nowrap; }
+.snap-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 92px; color: #666; }
+.snap-value {
+  font-weight: 600; color: #333; white-space: nowrap;
+  font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
+  font-variant-numeric: tabular-nums;
+}
+.snap-now-green { color: #67c23a; }
+.snap-now-yellow { color: #e6a23c; }
+.snap-now-red { color: #f56c6c; }
+.snap-now-gray { color: #333; }
 .snap-target { font-weight: 400; color: #999; font-size: 10px; }
+.snap-rate {
+  font-size: 10px; font-weight: 700; flex-shrink: 0; min-width: 34px; text-align: right;
+  font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
+  font-variant-numeric: tabular-nums;
+}
+.rate-green { color: #67c23a; }
+.rate-yellow { color: #e6a23c; }
+.rate-red { color: #f56c6c; }
+.rate-gray { color: #bbb; }
 .kpi-snapshot-more { font-size: 10px; color: #409eff; text-align: center; cursor: pointer; padding: 1px; }
 .node-click-hint { font-size: 10px; color: #bbb; text-align: center; margin-top: 2px; }
 
@@ -311,15 +347,23 @@ function getKrProgressText(kr: any): string {
 .ps-done { background: #f0f9eb; color: #67c23a; }
 
 .node-progress-bar {
-  display: flex; align-items: center; gap: 6px; margin-top: 4px;
-  height: 10px; position: relative;
+  display: flex; align-items: center; gap: 6px; margin-top: 6px;
+  justify-content: flex-end;
+}
+.node-progress-label {
+  font-size: 10px; color: #909399; flex-shrink: 0; line-height: 1;
+}
+.node-progress-track {
+  flex: 1; max-width: 90px; height: 6px; background: #e4e7ed;
+  border-radius: 3px; overflow: hidden;
 }
 .node-progress-fill {
-  height: 6px; border-radius: 3px; transition: width 0.4s ease;
+  height: 100%; border-radius: 3px; transition: width 0.4s ease;
   min-width: 4px;
 }
 .node-progress-text {
-  font-size: 10px; font-weight: 600; color: #666;
+  font-size: 10px; font-weight: 700; min-width: 34px; text-align: right;
+  font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
   font-variant-numeric: tabular-nums; line-height: 1;
 }
 
diff --git a/frontend/src/components/strategy-map/StrategyLayer.vue b/frontend/src/components/strategy-map/StrategyLayer.vue
index a521122d..fb4020f2 100644
--- a/frontend/src/components/strategy-map/StrategyLayer.vue
+++ b/frontend/src/components/strategy-map/StrategyLayer.vue
@@ -43,6 +43,7 @@
               :icon-map="iconMap"
               :kpi-name-map="kpiNameMap"
               :all-kpis="allKpis"
+              :chain-dimmed="chainNodeKeys.length > 0 && !chainNodeKeys.includes(`${layerKey}-${index}`)"
               @click="onNodeClick(layerKey, index, element)"
               @edit="$emit('edit-objective', { dimKey: layerKey, idx: index, obj: element })"
               @delete="$emit('delete-objective', { dimKey: layerKey, idx: index })"
@@ -91,6 +92,8 @@ const props = defineProps<{
   iconMap?: Record<string, string>
   kpiNameMap?: Record<string, string>
   allKpis?: any[]
+  /** 因果链查看模式下，不在链上的节点变淡 */
+  chainNodeKeys?: string[]
   getNodeLevel: (key: string) => string
   getNodeProgress: (key: string) => any
 }>()
diff --git a/frontend/src/components/strategy/ConnectionLines.vue b/frontend/src/components/strategy/ConnectionLines.vue
index 936775ec..1189313e 100644
--- a/frontend/src/components/strategy/ConnectionLines.vue
+++ b/frontend/src/components/strategy/ConnectionLines.vue
@@ -1,138 +1,141 @@
 <template>
   <svg class="connection-svg" ref="svgRef">
     <defs>
-      <!-- 跨层箭头（↓方向） -->
-      <marker
-        id="arrow-down"
-        markerWidth="10"
-        markerHeight="7"
-        refX="5"
-        refY="7"
-        orient="auto"
-      >
+      <!-- 跨层箭头（灰） -->
+      <marker id="arrow-gray" markerWidth="10" markerHeight="7" refX="8" refY="3.5" orient="auto">
         <polygon points="0,0 10,3.5 0,7" fill="#909399" />
       </marker>
-      <!-- 同层箭头（→方向） -->
-      <marker
-        id="arrow-right"
-        markerWidth="10"
-        markerHeight="7"
-        refX="10"
-        refY="3.5"
-        orient="auto"
-      >
+      <!-- 正向连线箭头（蓝） -->
+      <marker id="arrow-blue" markerWidth="10" markerHeight="7" refX="8" refY="3.5" orient="auto">
         <polygon points="0,0 10,3.5 0,7" fill="#409eff" />
       </marker>
-      <!-- 高亮箭头 -->
-      <marker
-        id="arrow-active"
-        markerWidth="10"
-        markerHeight="7"
-        refX="10"
-        refY="3.5"
-        orient="auto"
-      >
+      <!-- 负向连线箭头（红） -->
+      <marker id="arrow-red" markerWidth="10" markerHeight="7" refX="8" refY="3.5" orient="auto">
         <polygon points="0,0 10,3.5 0,7" fill="#f56c6c" />
       </marker>
+      <!-- 因果链高亮箭头（橙） -->
+      <marker id="arrow-orange" markerWidth="10" markerHeight="7" refX="8" refY="3.5" orient="auto">
+        <polygon points="0,0 10,3.5 0,7" fill="#e6a23c" />
+      </marker>
+      <!-- 绘制中临时线箭头（橙） -->
+      <marker id="arrow-warn" markerWidth="10" markerHeight="7" refX="8" refY="3.5" orient="auto">
+        <polygon points="0,0 10,3.5 0,7" fill="#e6a23c" />
+      </marker>
     </defs>
 
-    <!-- 跨层固定箭头：每层底部 → 下层顶部 -->
-    <line
+    <!-- 跨层固定箭头：贝塞尔曲线（每层底部 → 下层顶部 / 因果视角反向） -->
+    <path
       v-for="(line, idx) in crossLayerLines"
       :key="'cross-' + idx"
-      :x1="line.x1"
-      :y1="line.y1"
-      :x2="line.x2"
-      :y2="line.y2"
+      :d="line.path"
+      fill="none"
       stroke="#909399"
       stroke-width="2"
       stroke-dasharray="6,3"
-      marker-end="url(#arrow-down)"
-      class="cross-layer-line"
+      marker-end="url(#arrow-gray)"
+      :class="['cross-layer-line', { 'cross-dim': chainActive }]"
     />
 
-    <!-- 同层用户手动连线箭头（→方向） -->
+    <!-- 用户自定义连线（贝塞尔曲线 + 语义样式 + 因果链高亮） -->
     <g v-for="(conn, idx) in layerConnections" :key="'conn-' + idx">
       <path
         :d="conn.path"
         :class="[
           'conn-line',
           { 'conn-selected': selectedIdx === idx },
+          { 'conn-chain': chainActive && inChain(idx) },
+          { 'conn-dim': chainActive && !inChain(idx) },
         ]"
-        :stroke="selectedIdx === idx ? '#f56c6c' : '#409eff'"
-        :stroke-width="selectedIdx === idx ? 3 : 2"
+        :stroke="strokeFor(conn, idx)"
+        :stroke-width="widthFor(conn, idx)"
+        :stroke-dasharray="dashFor(conn, idx)"
         fill="none"
-        marker-end="url(#arrow-right)"
+        :marker-end="markerFor(conn, idx)"
         @click.stop="$emit('select-connection', idx)"
-        @mouseenter="hoverIdx = idx"
-        @mouseleave="hoverIdx = null"
+        @mouseenter="onConnEnter(idx)"
+        @mouseleave="onConnLeave"
       />
-      <!-- hover提示 -->
-      <rect
-        v-if="hoverIdx === idx"
-        :x="conn.mx - 50"
-        :y="conn.my - 10"
-        width="100"
-        height="20"
-        rx="4"
-        fill="rgba(0,0,0,0.65)"
-        class="conn-hover-bg"
-      />
-      <text
-        v-if="hoverIdx === idx"
-        :x="conn.mx"
-        :y="conn.my + 4"
-        text-anchor="middle"
-        fill="#fff"
-        font-size="11"
-        class="conn-hover-text"
+      <!-- 连线语义标签（正向/负向） -->
+      <g
+        v-if="conn.label"
+        :class="['conn-label', { 'conn-label-dim': chainActive && !inChain(idx) }]"
+        :style="{ '--label-color': labelColor(conn) }"
+        @click.stop="$emit('select-connection', idx)"
       >
-        点击选中
-      </text>
-      <!-- 删除按钮（选中时） -->
-      <g v-if="selectedIdx === idx">
         <rect
-          :x="conn.mx - 20"
-          :y="conn.my - 28"
-          width="88"
-          height="24"
-          rx="12"
-          fill="#f56c6c"
-          class="del-btn-bg"
+          :x="conn.mx - labelW(conn) / 2"
+          :y="conn.my - 22"
+          :width="labelW(conn)"
+          height="16"
+          rx="8"
+          class="conn-label-bg"
+        />
+        <text
+          :x="conn.mx"
+          :y="conn.my - 10.5"
+          text-anchor="middle"
+          font-size="10.5"
+          class="conn-label-text"
+        >{{ conn.label }}</text>
+      </g>
+
+      <!-- hover提示 -->
+      <g v-if="hoverIdx === idx && selectedIdx !== idx">
+        <rect :x="conn.mx - 50" :y="conn.my - 10" width="100" height="20" rx="4" fill="rgba(0,0,0,0.65)" class="conn-hover-bg" />
+        <text :x="conn.mx" :y="conn.my + 4" text-anchor="middle" fill="#fff" font-size="11" class="conn-hover-text">点击选中连线</text>
+      </g>
+
+      <!-- 选中操作区：正/负向 + 标签 + 删除 -->
+      <g v-if="selectedIdx === idx" class="conn-actions">
+        <rect
+          :x="conn.mx - 96" :y="conn.my - 44" width="192" height="26" rx="13"
+          fill="rgba(255,255,255,0.95)" stroke="#dcdfe6" class="conn-actions-bg"
+        />
+        <rect
+          :x="conn.mx - 90" :y="conn.my - 39" width="54" height="16" rx="8"
+          :fill="conn.effect === 'negative' ? '#f56c6c' : '#409eff'" class="act-btn"
+          @click.stop="toggleEffect(idx)"
+        />
+        <text
+          :x="conn.mx - 63" :y="conn.my - 27.5" text-anchor="middle" fill="#fff" font-size="11" font-weight="600"
+          class="act-btn-text" @click.stop="toggleEffect(idx)"
+        >{{ conn.effect === 'negative' ? '负向' : '正向' }}</text>
+        <rect
+          :x="conn.mx - 30" :y="conn.my - 39" width="54" height="16" rx="8" fill="#ecf5ff" class="act-btn"
+          @click.stop="editLabel(idx)"
+        />
+        <text
+          :x="conn.mx - 3" :y="conn.my - 27.5" text-anchor="middle" fill="#409eff" font-size="11" font-weight="600"
+          class="act-btn-text" @click.stop="editLabel(idx)"
+        >标签 ✎</text>
+        <rect
+          :x="conn.mx + 30" :y="conn.my - 39" width="54" height="16" rx="8" fill="#f56c6c" class="act-btn"
           @click.stop="$emit('delete-connection', idx)"
         />
         <text
-          :x="conn.mx + 24"
-          :y="conn.my - 12"
-          text-anchor="middle"
-          fill="#fff"
-          font-size="12"
-          font-weight="bold"
-          class="del-btn-text"
-          @click.stop="$emit('delete-connection', idx)"
-        >
-          ✕ 删除连线
-        </text>
+          :x="conn.mx + 57" :y="conn.my - 27.5" text-anchor="middle" fill="#fff" font-size="11" font-weight="600"
+          class="act-btn-text" @click.stop="$emit('delete-connection', idx)"
+        >删除</text>
       </g>
     </g>
 
     <!-- 绘制中的临时线 -->
-    <line
+    <path
       v-if="tempLine"
-      :x1="tempLine.x1"
-      :y1="tempLine.y1"
-      :x2="tempLine.x2"
-      :y2="tempLine.y2"
+      :d="tempLinePath"
+      fill="none"
       stroke="#e6a23c"
       stroke-width="2"
       stroke-dasharray="6,3"
-      marker-end="url(#arrow-down)"
+      marker-end="url(#arrow-warn)"
     />
   </svg>
 </template>
 
 <script setup>
-import { ref, computed, onMounted, onUnmounted, nextTick } from 'vue'
+import { ref, computed, watch, onMounted, onUnmounted, nextTick } from 'vue'
+import { ElMessageBox } from 'element-plus'
+import { getChainForConnection, getChainForNode } from '../../utils/chainGraph'
 
 const props = defineProps({
   /** 各层DOM元素引用，格式：{ financial: HTMLElement, customer: HTMLElement, ... } */
@@ -141,7 +144,7 @@ const props = defineProps({
   nodeRefs: { type: Object, default: () => ({}) },
   /** 层顺序列表 */
   layerKeys: { type: Array, default: () => ['financial', 'customer', 'process', 'learning'] },
-  /** 同层连线数据 [{from: 'financial-0', to: 'financial-1'}] */
+  /** 同层连线数据 [{from: 'financial-0', to: 'financial-1', effect, label}] */
   connections: { type: Array, default: () => [] },
   /** 临时连线 */
   tempLine: { type: Object, default: null },
@@ -149,9 +152,19 @@ const props = defineProps({
   containerKey: { type: Number, default: 0 },
   /** 视角方向：cascade(级联,上层→下层) / causal(因果,下层→上层) */
   viewDirection: { type: String, default: 'cascade' },
+  /** 因果链查看模式是否开启 */
+  chainMode: { type: Boolean, default: false },
+  /** 因果链查看模式下聚焦的节点 key（点击节点触发） */
+  chainFocusKey: { type: String, default: null },
 })
 
-const emit = defineEmits(['select-connection', 'delete-connection'])
+const emit = defineEmits([
+  'select-connection',
+  'delete-connection',
+  'chain-hover',
+  'chain-focus',
+  'update-connection',
+])
 
 const svgRef = ref(null)
 const hoverIdx = ref(null)
@@ -159,15 +172,127 @@ const selectedIdx = ref(null)
 const layerConnections = ref([])
 const crossLayerLines = ref([])
 
-/**
- * 计算跨层固定箭头
- * cascade: 从上层底部中心 → 下层顶部中心（管理视角，上层驱动下层）
- * causal:  从下层顶部中心 → 上层底部中心（因果视角，下层驱动上层）
- */
+// ── 因果链高亮状态 ──
+const hoverChain = ref(null) // { nodes: [], connIdxs: [] } | null
+const focusChain = ref(null)
+
+const chainActive = computed(() => hoverChain.value !== null || focusChain.value !== null)
+
+function inChain(idx) {
+  if (hoverChain.value?.connIdxs.includes(idx)) return true
+  if (focusChain.value?.connIdxs.includes(idx)) return true
+  return false
+}
+
+function onConnEnter(idx) {
+  hoverIdx.value = idx
+  const chain = getChainForConnection(props.connections, idx)
+  hoverChain.value = chain
+  emit('chain-hover', chain ? chain.nodes : null)
+}
+
+function onConnLeave() {
+  hoverIdx.value = null
+  hoverChain.value = null
+  emit('chain-hover', null)
+}
+
+/** chainFocusKey 变化 → 重算聚焦因果链并通知父级（用于节点变淡） */
+function recomputeFocusChain() {
+  let chain = null
+  if (props.chainMode && props.chainFocusKey) {
+    chain = getChainForNode(props.connections, props.chainFocusKey)
+  }
+  focusChain.value = chain
+  emit('chain-focus', chain ? chain.nodes : null)
+}
+
+watch(() => props.chainFocusKey, recomputeFocusChain)
+watch(() => props.chainMode, (v) => {
+  if (!v) {
+    focusChain.value = null
+    emit('chain-focus', null)
+  } else {
+    recomputeFocusChain()
+  }
+})
+// 连线增删时保持聚焦链最新
+watch(() => props.connections, recomputeFocusChain, { deep: true })
+
+// ── 连线语义样式 ──
+function isNegative(conn) {
+  return conn && conn.effect === 'negative'
+}
+
+function strokeFor(conn, idx) {
+  if (selectedIdx.value === idx) return '#f56c6c'
+  if (chainActive.value && inChain(idx)) return '#e6a23c'
+  if (chainActive.value) return '#c0c4cc'
+  return isNegative(conn) ? '#f56c6c' : '#409eff'
+}
+
+function widthFor(conn, idx) {
+  if (selectedIdx.value === idx) return 3
+  if (chainActive.value && inChain(idx)) return 3.5
+  if (chainActive.value) return 1.5
+  return isNegative(conn) ? 2 : 2
+}
+
+function dashFor(conn, idx) {
+  if (chainActive.value && inChain(idx)) return 'none'
+  if (chainActive.value) return '4,3'
+  return isNegative(conn) ? '7,4' : 'none'
+}
+
+function markerFor(conn, idx) {
+  if (selectedIdx.value === idx) return 'url(#arrow-red)'
+  if (chainActive.value && inChain(idx)) return 'url(#arrow-orange)'
+  if (chainActive.value) return 'url(#arrow-gray)'
+  return isNegative(conn) ? 'url(#arrow-red)' : 'url(#arrow-blue)'
+}
+
+function labelColor(conn) {
+  return isNegative(conn) ? '#f56c6c' : '#409eff'
+}
+
+function labelW(conn) {
+  return (conn.label ? conn.label.length : 0) * 12 + 16
+}
+
+// ── 连线语义编辑 ──
+function toggleEffect(idx) {
+  const conn = props.connections[idx]
+  if (!conn) return
+  emit('update-connection', idx, {
+    effect: conn.effect === 'negative' ? 'positive' : 'negative',
+  })
+}
+
+function editLabel(idx) {
+  const conn = props.connections[idx]
+  if (!conn) return
+  ElMessageBox.prompt(
+    '输入连线语义标签（如 "↑降低成本" / "↓提升利润"），留空则清除',
+    '连线语义标签',
+    {
+      inputValue: conn.label || '',
+      confirmButtonText: '确定',
+      cancelButtonText: '取消',
+      inputPlaceholder: '如：↑降低成本',
+    }
+  ).then(({ value }) => {
+    emit('update-connection', idx, { label: (value || '').trim() })
+  }).catch(() => { /* 取消 */ })
+}
+
+// ── 跨层箭头：贝塞尔曲线 ──
 function calcCrossLayerLines() {
   const lines = []
   const keys = props.layerKeys
   const isCausal = props.viewDirection === 'causal'
+  const svg = svgRef.value
+  if (!svg) return
+  const svgRect = svg.getBoundingClientRect()
   for (let i = 0; i < keys.length - 1; i++) {
     const upperEl = props.layerRefs[keys[i]]
     const lowerEl = props.layerRefs[keys[i + 1]]
@@ -175,35 +300,18 @@ function calcCrossLayerLines() {
 
     const ur = upperEl.getBoundingClientRect()
     const lr = lowerEl.getBoundingClientRect()
-    const svg = svgRef.value
-    if (!svg) continue
-    const svgRect = svg.getBoundingClientRect()
-
-    if (isCausal) {
-      // 因果视角：从下层顶 → 上层底（箭头向上）
-      lines.push({
-        x1: lr.left + lr.width / 2 - svgRect.left,
-        y1: lr.top - svgRect.top,
-        x2: ur.left + ur.width / 2 - svgRect.left,
-        y2: ur.bottom - svgRect.top,
-      })
-    } else {
-      // 级联视角：从上层底 → 下层顶（箭头向下）
-      lines.push({
-        x1: ur.left + ur.width / 2 - svgRect.left,
-        y1: ur.bottom - svgRect.top,
-        x2: lr.left + lr.width / 2 - svgRect.left,
-        y2: lr.top - svgRect.top,
-      })
-    }
+    const cx = (ur.left + ur.width / 2 - svgRect.left + lr.left + lr.width / 2 - svgRect.left) / 2
+    const y1 = (isCausal ? lr.top : ur.bottom) - svgRect.top
+    const y2 = (isCausal ? ur.bottom : lr.top) - svgRect.top
+    const bend = 28 // 曲线横向弯曲幅度
+    // 三次贝塞尔：垂直方向柔和 S 曲线
+    const path = `M ${cx} ${y1} C ${cx + bend} ${y1}, ${cx + bend} ${y2}, ${cx} ${y2}`
+    lines.push({ path })
   }
   crossLayerLines.value = lines
 }
 
-/**
- * 计算同层用户连线
- * 使用贝塞尔曲线从源节点右侧 → 目标节点左侧
- */
+// ── 同层用户连线：贝塞尔曲线 ──
 function calcLayerConnections() {
   const result = []
   const svg = svgRef.value
@@ -224,8 +332,8 @@ function calcLayerConnections() {
     const x2 = tr.left - svgRect.left
     const y2 = tr.top + tr.height / 2 - svgRect.top
 
-    // 贝塞尔曲线控制点
-    const dx = Math.abs(x2 - x1) * 0.5
+    // 贝塞尔曲线控制点（水平拖拽，曲线柔和）
+    const dx = Math.max(Math.abs(x2 - x1) * 0.5, 40)
     const cp1x = x1 + dx
     const cp1y = y1
     const cp2x = x2 - dx
@@ -239,16 +347,30 @@ function calcLayerConnections() {
       my: (y1 + y2) / 2,
       from: conn.from,
       to: conn.to,
+      effect: conn.effect || 'positive',
+      label: conn.label || '',
     })
   }
   layerConnections.value = result
 }
 
+// ── 绘制中临时线（贝塞尔） ──
+const tempLinePath = computed(() => {
+  if (!props.tempLine) return ''
+  const { x1, y1, x2, y2 } = props.tempLine
+  const dx = Math.max(Math.abs(x2 - x1) * 0.5, 40)
+  return `M ${x1} ${y1} C ${x1 + dx} ${y1}, ${x2 - dx} ${y2}, ${x2} ${y2}`
+})
+
 function recalcAll() {
   calcCrossLayerLines()
   calcLayerConnections()
 }
 
+watch(() => props.containerKey, () => recalcAll())
+watch(() => props.viewDirection, () => recalcAll())
+watch(() => props.connections, () => recalcAll(), { deep: true })
+
 // 暴露给父组件调用
 defineExpose({ recalcAll })
 
@@ -270,34 +392,61 @@ onMounted(() => {
 }
 .cross-layer-line {
   pointer-events: none;
+  transition: opacity 0.2s;
+}
+.cross-dim {
+  opacity: 0.18;
 }
 .conn-line {
   cursor: pointer;
-  transition: stroke 0.15s, stroke-width 0.15s;
+  transition: stroke 0.15s, stroke-width 0.15s, opacity 0.2s;
   pointer-events: stroke;
 }
-.conn-line:hover {
-  stroke: #e6a23c !important;
-  stroke-width: 4 !important;
+.conn-line.conn-chain {
+  filter: drop-shadow(0 0 3px rgba(230, 162, 60, 0.65));
+}
+.conn-line.conn-dim {
+  opacity: 0.25;
 }
 .conn-selected {
-  stroke: #f56c6c !important;
-  stroke-width: 3;
+  filter: drop-shadow(0 0 3px rgba(245, 108, 108, 0.6));
 }
-.del-btn-bg {
+.conn-label {
   cursor: pointer;
   pointer-events: all;
+  transition: opacity 0.2s;
 }
-.del-btn-bg:hover {
-  fill: #e74c3c !important;
+.conn-label-dim {
+  opacity: 0.25;
 }
-.del-btn-text {
-  cursor: pointer;
-  pointer-events: all;
-  user-select: none;
+.conn-label-bg {
+  fill: rgba(255, 255, 255, 0.92);
+  stroke: var(--label-color, #409eff);
+  stroke-width: 1;
+}
+.conn-label-text {
+  fill: #303133;
+  font-weight: 600;
+  pointer-events: none;
 }
 .conn-hover-bg,
 .conn-hover-text {
   pointer-events: none;
 }
+.conn-actions-bg {
+  pointer-events: all;
+}
+.act-btn {
+  cursor: pointer;
+  pointer-events: all;
+  transition: opacity 0.15s;
+}
+.act-btn:hover {
+  opacity: 0.8;
+}
+.act-btn-text {
+  cursor: pointer;
+  pointer-events: all;
+  user-select: none;
+}
 </style>
diff --git a/frontend/src/utils/chainGraph.ts b/frontend/src/utils/chainGraph.ts
new file mode 100644
index 00000000..7ac27fe1
--- /dev/null
+++ b/frontend/src/utils/chainGraph.ts
@@ -0,0 +1,91 @@
+/**
+ * 因果链图算法 — 供 ConnectionLines / MapCanvas 共用
+ * 连线数据: { from: 'financial-0', to: 'customer-1', effect?: 'positive'|'negative', label?: string }
+ */
+
+export interface ChainResult {
+  /** 链上节点 key 集合 */
+  nodes: string[]
+  /** 链上连线索引集合 */
+  connIdxs: number[]
+}
+
+interface AdjNode {
+  out: Set<string>
+  in: Set<string>
+}
+
+function buildAdjacency(connections: any[]): Map<string, AdjNode> {
+  const adj = new Map<string, AdjNode>()
+  for (const c of connections) {
+    if (!c?.from || !c?.to) continue
+    if (!adj.has(c.from)) adj.set(c.from, { out: new Set(), in: new Set() })
+    if (!adj.has(c.to)) adj.set(c.to, { out: new Set(), in: new Set() })
+    adj.get(c.from)!.out.add(c.to)
+    adj.get(c.to)!.in.add(c.from)
+  }
+  return adj
+}
+
+/** 从 start 沿 out 边 BFS（下游） */
+function descendants(adj: Map<string, AdjNode>, start: string): Set<string> {
+  const seen = new Set<string>([start])
+  const queue = [start]
+  while (queue.length) {
+    const cur = queue.shift()!
+    for (const next of adj.get(cur)?.out ?? []) {
+      if (!seen.has(next)) {
+        seen.add(next)
+        queue.push(next)
+      }
+    }
+  }
+  return seen
+}
+
+/** 从 start 沿 in 边 BFS（上游） */
+function ancestors(adj: Map<string, AdjNode>, start: string): Set<string> {
+  const seen = new Set<string>([start])
+  const queue = [start]
+  while (queue.length) {
+    const cur = queue.shift()!
+    for (const prev of adj.get(cur)?.in ?? []) {
+      if (!seen.has(prev)) {
+        seen.add(prev)
+        queue.push(prev)
+      }
+    }
+  }
+  return seen
+}
+
+/**
+ * 某条连线的完整因果链：源节点的所有下游 + 目标节点的所有上游
+ * （即"从因到果"整条路径上的节点与连线）
+ */
+export function getChainForConnection(connections: any[], connIdx: number): ChainResult | null {
+  const conn = connections[connIdx]
+  if (!conn?.from || !conn?.to) return null
+  const adj = buildAdjacency(connections)
+  const nodeSet = new Set<string>([...descendants(adj, conn.from), ...ancestors(adj, conn.to)])
+  const connIdxs: number[] = []
+  connections.forEach((c, i) => {
+    if (c?.from && c?.to && nodeSet.has(c.from) && nodeSet.has(c.to)) connIdxs.push(i)
+  })
+  return { nodes: [...nodeSet], connIdxs }
+}
+
+/**
+ * 某节点的相关因果链：其上游（原因）+ 下游（结果）全部节点与连线
+ */
+export function getChainForNode(connections: any[], nodeKey: string): ChainResult | null {
+  const adj = buildAdjacency(connections)
+  if (!adj.has(nodeKey)) return null
+  const nodeSet = new Set<string>([...descendants(adj, nodeKey), ...ancestors(adj, nodeKey)])
+  if (nodeSet.size <= 1) return { nodes: [nodeKey], connIdxs: [] }
+  const connIdxs: number[] = []
+  connections.forEach((c, i) => {
+    if (c?.from && c?.to && nodeSet.has(c.from) && nodeSet.has(c.to)) connIdxs.push(i)
+  })
+  return { nodes: [...nodeSet], connIdxs }
+}
diff --git a/frontend/src/views/MapCanvas.vue b/frontend/src/views/MapCanvas.vue
index 08c3ee7c..63c67a10 100644
--- a/frontend/src/views/MapCanvas.vue
+++ b/frontend/src/views/MapCanvas.vue
@@ -7,6 +7,7 @@
       :view-direction="viewDirection"
       :current-map="currentMap"
       :linking-from="linkingFrom"
+      :chain-mode="chainMode"
       @select-map="onSelectMap"
       @update:view-direction="v => viewDirection = v"
       @zoom-in="zoomIn"
@@ -20,8 +21,15 @@
       @show-versions="showVersions = true; loadVersions()"
       @go-alignment="goAlignment"
       @cancel-link="cancelLink"
+      @toggle-chain-mode="toggleChainMode"
     />
 
+    <!-- 因果链查看模式提示 -->
+    <div v-if="chainMode" class="chain-mode-bar">
+      <span>🔍 因果链查看模式 — 点击节点聚焦其相关因果链（再次点击取消），其余节点自动变淡</span>
+      <el-button size="small" type="warning" @click="toggleChainMode">退出模式</el-button>
+    </div>
+
     <!-- 连线模式提示 -->
     <div v-if="linkingFrom" class="linking-bar">
       <span>🔗 从「{{ linkingFrom.obj.name }}」连线 — 点击另一个目标完成连线</span>
@@ -67,6 +75,7 @@
             :all-kpis="allKpis"
             :get-node-level="getNodeLevel"
             :get-node-progress="getNodeProgress"
+            :chain-node-keys="chainNodeKeys"
             @add-objective="openAddDialog"
             @edit-objective="(p: any) => openEditDialog(p.dimKey, p.idx, p.obj)"
             @delete-objective="(p: any) => deleteNode(p.dimKey, p.idx)"
@@ -102,8 +111,13 @@
       :temp-line="tempLine"
       :container-key="recalcTrigger"
       :view-direction="viewDirection"
+      :chain-mode="chainMode"
+      :chain-focus-key="chainFocusKey"
       @select-connection="onSelectConnection"
       @delete-connection="onDeleteConnection"
+      @chain-hover="onChainHover"
+      @chain-focus="onChainFocus"
+      @update-connection="onUpdateConnection"
     />
 
     <!-- 所有弹窗统一管理 -->
@@ -179,6 +193,38 @@ const tempLine = ref<{ x1: number; y1: number; x2: number; y2: number } | null>(
 const dragConnectTarget = ref<string | null>(null)
 const selectedConnIdx = ref<number | null>(null)
 
+// ── 因果链查看模式 ──
+const chainMode = ref(false)
+const chainFocusKey = ref<string | null>(null)
+const chainHoverNodes = ref<string[] | null>(null)
+const chainFocusNodes = ref<string[] | null>(null)
+
+/** 当前因果链涉及的节点 key 集合（悬停链 ∪ 聚焦链），用于节点变淡 */
+const chainNodeKeys = computed<string[]>(() => {
+  const set = new Set<string>()
+  chainHoverNodes.value?.forEach(k => set.add(k))
+  chainFocusNodes.value?.forEach(k => set.add(k))
+  return [...set]
+})
+
+function toggleChainMode() {
+  chainMode.value = !chainMode.value
+  chainFocusKey.value = null
+  chainHoverNodes.value = null
+  chainFocusNodes.value = null
+  if (!chainMode.value) selectedConnIdx.value = null
+}
+
+function onChainHover(nodes: string[] | null) { chainHoverNodes.value = nodes }
+function onChainFocus(nodes: string[] | null) { chainFocusNodes.value = nodes }
+
+/** 更新连线语义（effect/label），落库 */
+function onUpdateConnection(idx: number, patch: any) {
+  if (!connections.value[idx]) return
+  Object.assign(connections.value[idx], patch)
+  saveConnections()
+}
+
 // 缩放
 const zoomLevel = ref(1)
 const scrollWrapRef = ref<HTMLElement | null>(null)
@@ -342,6 +388,10 @@ function loadCanvas() {
   connections.value = []
   linkingFrom.value = null
   selectedConnIdx.value = null
+  chainMode.value = false
+  chainFocusKey.value = null
+  chainHoverNodes.value = null
+  chainFocusNodes.value = null
   loading.value = true
 
   api.get("/maps").then((r: any) => {
@@ -404,6 +454,11 @@ function onNodeClick(dimKey: string, oi: number, obj: any) {
     completeConnection(linkingFrom.value.key, key)
     return
   }
+  // 因果链查看模式：点击节点聚焦其相关因果链，再次点击取消
+  if (chainMode.value) {
+    chainFocusKey.value = chainFocusKey.value === key ? null : key
+    return
+  }
   // 有KPI则展示详情
   if (kpiProgressMap[key]?.kpiList?.length > 0) {
     showKpiDetailModal(dimKey, oi, obj)
@@ -433,12 +488,12 @@ function completeConnection(fromKey: string, toKey: string) {
     from: fromKey, to: toKey,
   }).then(() => {
     ElMessage.success("连线已添加")
-    connections.value.push({ from: fromKey, to: toKey, style: "solid" })
+    connections.value.push({ from: fromKey, to: toKey, style: "solid", effect: "positive", label: "" })
     cancelLink()
     nextTick(() => { triggerRecalc(); saveConnections() })
   }).catch((e: any) => {
     if (e?.response?.status !== 400) {
-      connections.value.push({ from: fromKey, to: toKey, style: "solid" })
+      connections.value.push({ from: fromKey, to: toKey, style: "solid", effect: "positive", label: "" })
       ElMessage.success("连线已添加（本地）")
     } else {
       ElMessage.warning(e?.response?.data?.detail || "连线失败")
@@ -976,6 +1031,14 @@ onUnmounted(() => {
   border-radius: 8px; margin-bottom: 8px; font-size: 14px; flex-shrink: 0;
 }
 
+.chain-mode-bar {
+  display: flex; align-items: center; gap: 12px;
+  padding: 8px 16px; background: #fdf6ec; border: 1px solid #f5dab1;
+  border-radius: 8px; margin-bottom: 8px; font-size: 13px; flex-shrink: 0;
+  color: #b88230;
+}
+.chain-mode-bar span { flex: 1; }
+
 .empty-state {
   flex: 1; display: flex; align-items: center; justify-content: center;
 }