diff --git a/docs/BUG_HISTORY.md b/docs/BUG_HISTORY.md
index d9a4caf2..ee272ca8 100644
--- a/docs/BUG_HISTORY.md
+++ b/docs/BUG_HISTORY.md
@@ -7617,3 +7617,19 @@
 - 复发自：无
 - 修复版本：待发布
 
+## BUG-495 | 选择题选中项外圈粗描边溢出气泡
+
+- 状态：resolved
+- 首次发现：2026-09-02
+- 最近更新：2026-09-02
+- 影响面：`.birth-time-choice-option:focus-visible`、嵌入 `RectificationChoiceCard`、`.message-bubble`
+- 用户现象：点选 A 后（或新题自动聚焦第一项时），选项外侧出现一圈粗的红棕色描边，圆角对不齐，看起来像边框溢出。已有选中底色和边框已经够用。
+- 触发条件：校正聊天里嵌入选择题；选项在 `.message-bubble { overflow: hidden }` 内。新题会 `focus()` 第一项，点击后按钮仍保持 `:focus-visible`。
+- 根因：`:focus-visible` 使用 `outline-offset: 2px`（会话页还有 `3px`），描边画在按钮外面，被气泡裁切。选中态 `border-color: var(--color-action)` 与焦点色相同，叠成双层粗边。
+- 修复：焦点环改为 `outline-offset: -2px` 画在按钮内。已选中项不再叠加 outline（高对比模式除外）。嵌入卡不再自动聚焦第一项。
+- 验证：`rectification-varga-style-copy` 锁 inset offset、选中无 outline、卡片不 `.focus()`。
+- 防复发：选择题焦点环不得使用正 `outline-offset`。选中态只保留 `data-selected` 的边框和底色。
+- 相关记录：BUG-490
+- 复发自：无
+- 修复版本：待发布
+
diff --git a/frontend/src/app/birth-time-choice.css b/frontend/src/app/birth-time-choice.css
index 298ce126..1c3998e7 100644
--- a/frontend/src/app/birth-time-choice.css
+++ b/frontend/src/app/birth-time-choice.css
@@ -11,7 +11,11 @@
 .birth-time-choice-option:hover:not(:disabled) { border-color: var(--color-border-strong); background: var(--color-canvas-soft); }
 .birth-time-choice-option:active:not(:disabled) { transform: scale(.96); }
 .birth-time-choice-option[data-selected="true"] { border-color: var(--color-action); background: var(--color-action-soft); color: var(--color-ink); }
-.birth-time-choice-option:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }
+.birth-time-choice-option:focus-visible { outline: 2px solid var(--color-focus); outline-offset: -2px; }
+.birth-time-choice-option[data-selected="true"]:focus-visible { outline: none; }
+@media (forced-colors: active) {
+  .birth-time-choice-option[data-selected="true"]:focus-visible { outline: 2px solid Highlight; outline-offset: -2px; }
+}
 .birth-time-choice-question:disabled .birth-time-choice-option { cursor: wait; opacity: .62; }
 .birth-time-choice-pending { margin: 0; color: var(--color-action); font-size: var(--type-caption); }
 .birth-time-unmatched-note { display: grid; gap: var(--space-2); color: var(--color-ink-secondary); font-size: var(--type-caption); font-weight: 600; }
diff --git a/frontend/src/app/globals.css b/frontend/src/app/globals.css
index c279a957..f01ca91a 100644
--- a/frontend/src/app/globals.css
+++ b/frontend/src/app/globals.css
@@ -930,6 +930,8 @@ button:disabled { cursor: default; opacity: .45; }
 .conversational-rectification > *, .conversational-rectification form, .conversational-rectification fieldset { min-width: 0; max-width: 100%; }
 .conversational-rectification button { min-height: 44px; max-width: 100%; overflow-wrap: anywhere; }
 .conversational-rectification :where(button, textarea):focus-visible { outline: 3px solid color-mix(in srgb, var(--color-focus) 56%, transparent); outline-offset: 3px; }
+.conversational-rectification .birth-time-choice-option:focus-visible { outline: 2px solid var(--color-focus); outline-offset: -2px; }
+.conversational-rectification .birth-time-choice-option[data-selected="true"]:focus-visible { outline: none; }
 .conversational-narrative { overflow: hidden; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-canvas); box-shadow: var(--shadow-soft); }
 .conversational-narrative-body { padding: var(--space-4) var(--space-5); }
 .conversational-narrative .message-markdown { overflow-wrap: anywhere; color: var(--color-ink-secondary); font-size: var(--type-body-sm); line-height: 1.8; }
diff --git a/frontend/src/components/rectification-choice-card.tsx b/frontend/src/components/rectification-choice-card.tsx
index 7c88ce97..976198a8 100644
--- a/frontend/src/components/rectification-choice-card.tsx
+++ b/frontend/src/components/rectification-choice-card.tsx
@@ -1,6 +1,6 @@
 "use client";
 
-import { useEffect, useRef, useState } from "react";
+import { useState } from "react";
 import type {
   ChoiceKey,
   RectificationChoiceCard as ChoiceCard,
@@ -20,14 +20,8 @@ type RectificationChoiceCardProps = Readonly<{
 export function RectificationChoiceCard(props: RectificationChoiceCardProps) {
   const [localSelected, setLocalSelected] = useState<ChoiceKey | "stop" | "">("");
   const selectedKey = props.selectedKey || localSelected;
-  const firstChoiceRef = useRef<HTMLButtonElement | null>(null);
   const answered = Boolean(selectedKey);
 
-  useEffect(() => {
-    if (props.pending || answered) return;
-    firstChoiceRef.current?.focus();
-  }, [answered, props.card.question_id, props.pending]);
-
   function select(key: ChoiceKey) {
     if (props.pending || props.disabled || selectedKey) return;
     setLocalSelected(key);
@@ -58,10 +52,9 @@ export function RectificationChoiceCard(props: RectificationChoiceCardProps) {
           : <legend>{props.card.prompt}</legend>}
         {!hidePrompt && props.card.why ? <p className="rectification-choice-why">{props.card.why}</p> : null}
         <div className="birth-time-primary-choices">
-          {props.card.options.map((option, index) => (
+          {props.card.options.map((option) => (
             <button
               key={option.key}
-              ref={index === 0 ? firstChoiceRef : undefined}
               type="button"
               className="birth-time-choice-option is-primary"
               data-selected={selectedKey === option.key ? "true" : "false"}
diff --git a/frontend/tests/rectification-varga-style-copy.test.ts b/frontend/tests/rectification-varga-style-copy.test.ts
index 678e59ee..cb12a2bf 100644
--- a/frontend/tests/rectification-varga-style-copy.test.ts
+++ b/frontend/tests/rectification-varga-style-copy.test.ts
@@ -353,3 +353,26 @@ test("embedded choice cards hide the duplicate legend; standalone cards keep the
   assert.match(card, /className="rectification-choice-why"/);
   assert.doesNotMatch(card, /choice-question-wrap|choice-stem-wrap|legend-spacer/);
 });
+
+test("choice option focus ring stays inside the button and does not stack on the selected border", () => {
+  const choiceCss = readFileSync(new URL("../src/app/birth-time-choice.css", import.meta.url), "utf8");
+  const globals = readFileSync(new URL("../src/app/globals.css", import.meta.url), "utf8");
+  const card = readFileSync(new URL("../src/components/rectification-choice-card.tsx", import.meta.url), "utf8");
+  const focusRule = choiceCss.match(/\.birth-time-choice-option:focus-visible \{[^}]+\}/)?.[0] ?? "";
+  const selectedFocusRule = choiceCss.match(
+    /\.birth-time-choice-option\[data-selected="true"\]:focus-visible \{[^}]+\}/,
+  )?.[0] ?? "";
+  assert.match(focusRule, /outline-offset:\s*-2px/);
+  assert.doesNotMatch(focusRule, /outline-offset:\s*[1-9]/);
+  assert.match(selectedFocusRule, /outline:\s*none/);
+  assert.match(
+    globals,
+    /\.conversational-rectification \.birth-time-choice-option:focus-visible \{[^}]*outline-offset:\s*-2px/,
+  );
+  assert.match(
+    globals,
+    /\.conversational-rectification \.birth-time-choice-option\[data-selected="true"\]:focus-visible \{[^}]*outline:\s*none/,
+  );
+  assert.doesNotMatch(card, /firstChoiceRef/);
+  assert.doesNotMatch(card, /\.focus\(/);
+});