diff --git a/src/admin.css b/src/admin.css
index 883931c..365d942 100644
--- a/src/admin.css
+++ b/src/admin.css
@@ -710,9 +710,11 @@ body {
     outline-offset: -3px;
 }
 .reader-content {
+    /* 正文紧邻目录左对齐，保留阅读行宽，不在宽屏内容区居中。 */
     max-width: 900px;
-    margin-inline: auto;
-    padding: 32px clamp(24px, 5cqw, 64px);
+    margin-inline: 0;
+    padding: 32px;
+    text-align: left;
 }
 .reader-chapter + .reader-chapter {
     margin-top: 48px;
diff --git a/src/features/create-drama/EpisodeReader.test.ts b/src/features/create-drama/EpisodeReader.test.ts
index cb1ac26..27aa2ab 100644
--- a/src/features/create-drama/EpisodeReader.test.ts
+++ b/src/features/create-drama/EpisodeReader.test.ts
@@ -1,6 +1,7 @@
 import { mount, type VueWrapper } from '@vue/test-utils'
 import { nextTick } from 'vue'
 import { afterEach, describe, expect, it, vi } from 'vitest'
+import { readFileSync } from 'node:fs'
 import EpisodeReader from './EpisodeReader.vue'
 import type { Episode } from '../projects/types'
 
@@ -61,6 +62,18 @@ function currentEpisode() {
 }
 
 describe('连续剧本阅读器', () => {
+    it('正文容器靠左并保留目录间距，宽屏不再使用自动外边距居中', () => {
+        // DOM 测试不计算布局；保护正文定位样式，目录联动仍由后续交互测试验证。
+        const css = readFileSync('src/admin.css', 'utf8')
+        const content = css.match(/\.reader-content\s*\{([^}]+)\}/)![1]!
+        expect(content).toContain('max-width: 900px')
+        expect(content).toContain('margin-inline: 0')
+        expect(content).toContain('padding: 32px')
+        expect(content).toContain('text-align: left')
+        expect(content).not.toContain('auto')
+        expect(css).toMatch(/@media \(max-width: 600px\)[\s\S]*?\.reader-content\s*\{\s*padding-inline:\s*18px/)
+    })
+
     it('按编号连续渲染全部剧集、元数据和空正文，标题不截断，模型内容只按文本显示', () => {
         const reversed = episodes.toReversed()
         wrapper = mount(EpisodeReader, { props: { episodes: reversed } })