diff --git a/apps/design-lab/e2e/pages.spec.ts b/apps/design-lab/e2e/pages.spec.ts
index f478fa9..041c8a4 100644
--- a/apps/design-lab/e2e/pages.spec.ts
+++ b/apps/design-lab/e2e/pages.spec.ts
@@ -115,7 +115,7 @@ test.describe('RouteLine 规格契约', () => {
     expect(specs).toContain('4 2')
   })
 
-  test('站点 r6 半嵌：源骑卡右黑影外缘、目标贴左描边', async ({ page }) => {
+  test('站点 r6 半嵌：源/目标圆心都骑卡描边（各半在卡上），线层在卡之上', async ({ page }) => {
     const c1 = await page.locator('a[href="#ch1"]').first().boundingBox()
     const c2 = await page.locator('a[href="#ch2"]').first().boundingBox()
     const wrap = await page.locator('main div.relative').first().boundingBox()
@@ -126,10 +126,17 @@ test.describe('RouteLine 规格契约', () => {
     )
     expect(stations.length).toBeGreaterThanOrEqual(4)
 
-    const c1ShadowEdge = c1!.x - wrap!.x + c1!.width + 7 // 描边外 + 7px 黑影
+    const c1Right = c1!.x - wrap!.x + c1!.width // 卡右描边（不接阴影）
     const c2Border = c2!.x - wrap!.x
-    expect(stations.some((s) => Math.abs(s.cx - c1ShadowEdge) <= 3), `源站点应骑黑影外缘 x≈${c1ShadowEdge}`).toBeTruthy()
-    expect(stations.some((s) => Math.abs(s.cx - c2Border) <= 3), `目标站点应贴左描边 x≈${c2Border}`).toBeTruthy()
+    expect(stations.some((s) => Math.abs(s.cx - c1Right) <= 3), `源站点圆心应骑卡右描边 x≈${c1Right}`).toBeTruthy()
+    expect(stations.some((s) => Math.abs(s.cx - c2Border) <= 3), `目标站点圆心应骑左描边 x≈${c2Border}`).toBeTruthy()
+
+    // 线层必须置于卡之上——否则半嵌的站点被卡盖住，只剩卡外一小块
+    const z = await page.evaluate(() => {
+      const svg = document.querySelector('main div.relative > svg') as SVGElement | null
+      return svg ? getComputedStyle(svg).zIndex : 'missing'
+    })
+    expect(z).toBe('10')
   })
 
   test('实线端点落在水平端口（M x y H 起、H x 止）', async ({ page }) => {
diff --git a/apps/design-lab/e2e/visual.spec.ts-snapshots/components-chromium-linux.png b/apps/design-lab/e2e/visual.spec.ts-snapshots/components-chromium-linux.png
index 3325b8f..afed0f2 100644
Binary files a/apps/design-lab/e2e/visual.spec.ts-snapshots/components-chromium-linux.png and b/apps/design-lab/e2e/visual.spec.ts-snapshots/components-chromium-linux.png differ
diff --git a/apps/design-lab/e2e/visual.spec.ts-snapshots/shelf-chromium-linux.png b/apps/design-lab/e2e/visual.spec.ts-snapshots/shelf-chromium-linux.png
index f7fc434..0340b25 100644
Binary files a/apps/design-lab/e2e/visual.spec.ts-snapshots/shelf-chromium-linux.png and b/apps/design-lab/e2e/visual.spec.ts-snapshots/shelf-chromium-linux.png differ
diff --git a/apps/design-lab/src/components/RouteLine.tsx b/apps/design-lab/src/components/RouteLine.tsx
index f1a0734..f1f6313 100644
--- a/apps/design-lab/src/components/RouteLine.tsx
+++ b/apps/design-lab/src/components/RouteLine.tsx
@@ -1,14 +1,15 @@
 /** RouteLine —— 关系线：线形即含义（实=先后 虚=相关 点=同族）
  * 拓扑：横平竖直 + R8 直角步进；并行不合并(4px)；站点 r6 半嵌卡边
- * （左贴描边、右骑硬投影外缘）；同口多线自动聚合胶囊（线止于胶囊边界）。 */
+ * （圆心骑左右描边，各半在卡上）；线层 z-10 置于卡之上，站点不被卡遮挡；
+ * 同口多线自动聚合胶囊（线止于胶囊边界）。 */
 import type { ChapterId, Edge } from '../lib/types'
 
 const STATION_COLORS = ['var(--color-clash2a)', 'var(--color-clash1b)', 'var(--color-clash3a)', 'var(--color-clash1a)']
 
 export interface LaneNode {
   id: ChapterId
-  borderLeft: number // 左描边 x（无影侧，入口贴这里）
-  right: number // 右侧黑影外缘 x（描边 + 7，出口从这里出发）
+  borderLeft: number // 左描边 x（入口圆心贴这里，点半嵌）
+  right: number // 右描边 x（出口圆心贴这里，点半嵌——不接阴影）
   y: number // 卡中线 y
 }
 
@@ -47,7 +48,7 @@ export function RouteLine({
       width={width}
       height={height}
       viewBox={`0 0 ${width} ${height}`}
-      className="pointer-events-none absolute left-0 top-0"
+      className="pointer-events-none absolute left-0 top-0 z-10"
       aria-hidden
     >
       {edges.map((e, i) => {
@@ -65,7 +66,7 @@ export function RouteLine({
         if (!a || !b) return null
         const ins = insByTo.get(e.to)!
         const capsule = ins.length > 1 && firstIn.has(e.to)
-        // 源站点骑出边卡黑影外缘；目标：单线=圆点贴描边，多线=胶囊（只画一次）
+        // 源/目标站点：圆心骑卡描边，各半在卡上；目标：单线=圆点，多线=胶囊（只画一次）
         return (
           <g key={`st-${e.from}-${e.to}`}>
             <circle cx={a.right} cy={a.y} r={6} fill={stationColor(si++)} stroke="var(--color-ink)" strokeWidth={2} />
diff --git a/apps/design-lab/src/pages/components/App.tsx b/apps/design-lab/src/pages/components/App.tsx
index 9e89cf5..0c9b046 100644
--- a/apps/design-lab/src/pages/components/App.tsx
+++ b/apps/design-lab/src/pages/components/App.tsx
@@ -5,10 +5,11 @@ import { RouteLine } from '../../components/RouteLine'
 import { AssignBlock, Ticket } from '../../components/Ticket'
 import { EntryGuide } from '../../components/EntryGuide'
 
+/* 节点＝卡描边真实边缘：卡1(40,72,250) 卡2(380,0,250) 卡3(700,0,150) */
 const nodes = {
-  1: { id: 1, borderLeft: 40, right: 299, y: 180 },
-  2: { id: 2, borderLeft: 378, right: 639, y: 108 },
-  5: { id: 5, borderLeft: 699, right: 848, y: 108 },
+  1: { id: 1, borderLeft: 40, right: 290, y: 180 },
+  2: { id: 2, borderLeft: 380, right: 630, y: 108 },
+  5: { id: 5, borderLeft: 700, right: 850, y: 108 },
 } as const
 
 export function App() {
diff --git a/apps/design-lab/src/pages/shelf/App.tsx b/apps/design-lab/src/pages/shelf/App.tsx
index 2be34d1..ba585e4 100644
--- a/apps/design-lab/src/pages/shelf/App.tsx
+++ b/apps/design-lab/src/pages/shelf/App.tsx
@@ -9,11 +9,11 @@ import { EntryGuide } from '../../components/EntryGuide'
 import { Scatter } from '../../components/Scatter'
 import { Bar, Cross, Ring, Tremble, Tri, Wave } from '../../components/shapes'
 
-/* 场景坐标（复刻已验收组合）：卡1(40,110,250) 卡2(380,44,250,rot) 卡3(700,44,140) */
+/* 场景坐标（节点＝卡描边真实边缘）：卡1(40,110,250) 卡2(380,44,250,rot) 卡3(700,44,140) */
 const nodes = {
-  1: { id: 1, borderLeft: 40, right: 299, y: 180 },
-  2: { id: 2, borderLeft: 378, right: 639, y: 108 },
-  5: { id: 5, borderLeft: 698, right: 848, y: 108 },
+  1: { id: 1, borderLeft: 40, right: 290, y: 180 },
+  2: { id: 2, borderLeft: 380, right: 630, y: 108 },
+  5: { id: 5, borderLeft: 700, right: 840, y: 108 },
 } as const
 
 export function App() {
diff --git a/docs/screenshots/design-lab/pr_components.png b/docs/screenshots/design-lab/pr_components.png
index 3325b8f..afed0f2 100644
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diff --git a/docs/screenshots/design-lab/pr_shelf.png b/docs/screenshots/design-lab/pr_shelf.png
index f7fc434..0340b25 100644
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