diff --git a/openless-all/app/src/components/Capsule.tsx b/openless-all/app/src/components/Capsule.tsx
index 4c669598..2c8cb987 100644
--- a/openless-all/app/src/components/Capsule.tsx
+++ b/openless-all/app/src/components/Capsule.tsx
@@ -318,7 +318,9 @@ export function Capsule() {
         position: 'relative',
         display: 'flex',
         alignItems: 'center',
-        justifyContent: os === 'win' ? 'flex-end' : 'center',
+        justifyContent: 'center',
+        paddingLeft: hostMetrics.horizontalInset,
+        paddingRight: hostMetrics.horizontalInset,
         paddingTop: os === 'win'
           ? Math.max(0, hostMetrics.height - metrics.height - hostMetrics.bottomInset)
           : 0,
@@ -336,7 +338,7 @@ export function Capsule() {
           position: 'absolute',
           left: '50%',
           // macOS / Linux：胶囊窗口 220×110、pill 居中，badge 锚到 pill 中线上方 21+8。
-          // Windows：pill 不居中（带 12pt 阴影 inset），用 hostMetrics 量到底部 inset + pill 高 + gap。
+          // Windows：host 比 pill 多出左右 12px / 底部 12px 的阴影空间，pill 仍保持居中。
           bottom: os === 'win'
             ? `${hostMetrics.bottomInset + metrics.height + hostMetrics.badgeGap}px`
             : 'calc(50% + 21px + 8px)',
diff --git a/openless-all/app/src/lib/capsuleLayout.test.ts b/openless-all/app/src/lib/capsuleLayout.test.ts
index 9fe675cb..2466301e 100644
--- a/openless-all/app/src/lib/capsuleLayout.test.ts
+++ b/openless-all/app/src/lib/capsuleLayout.test.ts
@@ -1,4 +1,5 @@
 import {
+  getCapsuleHostMetrics,
   getCapsuleMessageLayout,
   getCapsulePillMetrics,
 } from './capsuleLayout.ts';
@@ -14,6 +15,21 @@ assertEqual(winMetrics.width, 196, 'windows capsule widens pill');
 assertEqual(winMetrics.height, 52, 'windows capsule increases pill height');
 assertEqual(winMetrics.textWidth, 118, 'windows capsule widens text slot');
 
+const winHost = getCapsuleHostMetrics('win', false);
+assertEqual(winHost.width, 220, 'windows capsule host keeps the current outer hitbox width');
+assertEqual(winHost.height, 84, 'windows capsule host keeps regular height');
+assertEqual(winHost.horizontalInset, 12, 'windows capsule host keeps symmetric shadow insets');
+assertEqual(
+  winHost.width,
+  winMetrics.width + winHost.horizontalInset * 2,
+  'windows capsule host width derives from pill width plus symmetric side insets',
+);
+
+const winHostWithTranslation = getCapsuleHostMetrics('win', true);
+assertEqual(winHostWithTranslation.width, 220, 'windows translation capsule keeps the same outer width');
+assertEqual(winHostWithTranslation.height, 118, 'windows translation capsule grows vertically only');
+assertEqual(winHostWithTranslation.horizontalInset, 12, 'windows translation capsule keeps symmetric side insets');
+
 const macMetrics = getCapsulePillMetrics('mac');
 assertEqual(macMetrics.width, 176, 'mac capsule keeps existing pill width');
 assertEqual(macMetrics.height, 42, 'mac capsule keeps existing pill height');
diff --git a/openless-all/app/src/lib/capsuleLayout.ts b/openless-all/app/src/lib/capsuleLayout.ts
index 7e8c8db7..28bb4344 100644
--- a/openless-all/app/src/lib/capsuleLayout.ts
+++ b/openless-all/app/src/lib/capsuleLayout.ts
@@ -11,6 +11,7 @@ export interface CapsulePillMetrics {
 export interface CapsuleHostMetrics {
   width: number;
   height: number;
+  horizontalInset: number;
   bottomInset: number;
   badgeGap: number;
 }
@@ -35,9 +36,17 @@ export function getCapsuleHostMetrics(
   translationActive: boolean,
 ): CapsuleHostMetrics {
   if (os === 'win') {
-    return { width: 220, height: translationActive ? 118 : 84, bottomInset: 12, badgeGap: 8 };
+    const horizontalInset = 12;
+    const pill = getCapsulePillMetrics(os);
+    return {
+      width: pill.width + horizontalInset * 2,
+      height: translationActive ? 118 : 84,
+      horizontalInset,
+      bottomInset: 12,
+      badgeGap: 8,
+    };
   }
-  return { width: 176, height: 42, bottomInset: 0, badgeGap: 8 };
+  return { width: 176, height: 42, horizontalInset: 0, bottomInset: 0, badgeGap: 8 };
 }
 
 export function getCapsuleMessageLayout(