diff --git a/apps/web/components/workbench/ChapterAssistant.tsx b/apps/web/components/workbench/ChapterAssistant.tsx
index 8d7ab12..32f9230 100644
--- a/apps/web/components/workbench/ChapterAssistant.tsx
+++ b/apps/web/components/workbench/ChapterAssistant.tsx
@@ -1,8 +1,11 @@
 "use client";
 
 import Link from "next/link";
-import { RotateCcw, X } from "lucide-react";
+import { Minus, Pin, PinOff, Plus, RotateCcw, Undo2, X } from "lucide-react";
 
+import { ThinkingIndicator } from "@/components/ThinkingIndicator";
+import { Button } from "@/components/ui/Button";
+import { SectionHeader } from "@/components/ui/SectionHeader";
 import { StatusNote } from "@/components/ui/StatusNote";
 import { buttonClass } from "@/lib/ui/variants";
 import {
@@ -27,7 +30,7 @@ interface ChapterAssistantProps {
 // 桌面 aside 包裹；移动端经 Workbench 抽屉复用 AssistantContent。
 export function ChapterAssistant({ projectId, chapterNo }: ChapterAssistantProps) {
   return (
-    <aside className="hidden border-l border-line bg-panel py-4 lg:block">
+    <aside className="hidden border-l border-line bg-panel py-4 xl:block">
       <AssistantContent projectId={projectId} chapterNo={chapterNo} />
     </aside>
   );
@@ -41,26 +44,31 @@ export function AssistantContent({ projectId, chapterNo }: ChapterAssistantProps
 
   return (
     <div className="px-4">
-      <div className="flex items-center justify-between">
-        <h2 className="text-sm font-semibold text-ink">本章助手</h2>
-        {injection.saving ? (
-          <span className="text-[10px] text-ink-soft">保存中…</span>
-        ) : null}
-      </div>
+      <SectionHeader
+        title="本章助手"
+        action={
+          injection.saving ? (
+            <ThinkingIndicator
+              label="助手保存中"
+              className="text-xs text-ink-soft"
+            />
+          ) : null
+        }
+      />
 
       <section className="mt-4">
-        <div className="flex items-center justify-between">
-          <h3 className="text-xs font-semibold uppercase tracking-wide text-ink-soft">
-            本章注入（透明）
-          </h3>
-          {data ? (
-            <RecentStepper
-              value={data.recent_n}
-              disabled={injection.saving}
-              onChange={injection.setRecentN}
-            />
-          ) : null}
-        </div>
+        <SectionHeader
+          title="本章注入（透明）"
+          action={
+            data ? (
+              <RecentStepper
+                value={data.recent_n}
+                disabled={injection.saving}
+                onChange={injection.setRecentN}
+              />
+            ) : null
+          }
+        />
 
         {injection.loading ? (
           <p className="mt-2 text-xs text-ink-soft">加载注入信息…</p>
@@ -131,9 +139,7 @@ export function AssistantContent({ projectId, chapterNo }: ChapterAssistantProps
 
         {excluded.length > 0 ? (
           <div className="mt-3">
-            <h4 className="text-[10px] uppercase tracking-wide text-ink-soft">
-              已排除（不注入）
-            </h4>
+            <SectionHeader title="已排除（不注入）" />
             <ul className="mt-1 space-y-1">
               {excluded.map((ref) => (
                 <ExcludedRow
@@ -149,12 +155,10 @@ export function AssistantContent({ projectId, chapterNo }: ChapterAssistantProps
       </section>
 
       <section className="mt-6">
-        <h3 className="text-xs font-semibold uppercase tracking-wide text-ink-soft">
-          四审
-        </h3>
-        <p className="mt-2 text-xs text-ink-soft">
-          一致性 / 伏笔 / 文风 / 节奏，在审稿页逐条裁决。
-        </p>
+        <SectionHeader
+          title="四审"
+          description="一致性 / 伏笔 / 文风 / 节奏，在审稿页逐条裁决。"
+        />
         <Link
           href={`/projects/${projectId}/review?chapter=${chapterNo}`}
           className={buttonClass({ variant: "outline", size: "sm", className: "mt-2" })}
@@ -179,42 +183,44 @@ function EntityRow({ entity, pinned, disabled, onTogglePin, onExclude }: EntityR
   return (
     <li className="rounded border border-line bg-bg p-2">
       <div className="flex items-center gap-2">
-        <span className="rounded bg-panel px-1.5 py-0.5 text-[10px] text-ink-soft">
+        <span className="rounded bg-panel px-1.5 py-0.5 text-2xs text-ink-soft">
           {kindLabel(entity.kind)}
         </span>
         <span className="text-sm text-ink">{entity.name}</span>
         <div className="ml-auto flex items-center gap-1">
-          <button
-            type="button"
+          <Button
+            variant="ghost"
+            size="icon"
             disabled={disabled}
             aria-pressed={pinned}
-            title={pinned ? "取消置顶" : "置顶（强制注入）"}
+            aria-label={
+              pinned ? `取消置顶 ${entity.name}` : `置顶 ${entity.name}（强制注入）`
+            }
             onClick={() => onTogglePin(ref)}
-            className={`rounded px-1.5 py-0.5 text-[11px] disabled:opacity-50 ${
-              pinned
-                ? "bg-[var(--color-cinnabar-wash)] text-cinnabar"
-                : "text-ink-soft hover:bg-panel"
-            }`}
+            className={pinned ? "text-cinnabar" : undefined}
           >
-            📌
-          </button>
-          <button
-            type="button"
+            {pinned ? (
+              <Pin className="h-4 w-4" aria-hidden="true" />
+            ) : (
+              <PinOff className="h-4 w-4" aria-hidden="true" />
+            )}
+          </Button>
+          <Button
+            variant="ghost"
+            size="icon"
             disabled={disabled}
-            title="排除（不注入本章）"
-            aria-label={`排除 ${entity.name}`}
+            aria-label={`排除 ${entity.name}（不注入本章）`}
             onClick={() => onExclude(ref)}
-            className="rounded px-1.5 py-0.5 text-[11px] text-ink-soft hover:bg-panel disabled:opacity-50"
           >
-            ✕
-          </button>
+            <X className="h-4 w-4" aria-hidden="true" />
+          </Button>
         </div>
       </div>
       <div className="mt-1.5 flex flex-wrap gap-1">
         {(entity.reasons ?? []).map((reason) => (
           <span
             key={reason}
-            className="rounded bg-[var(--color-cinnabar-wash)] px-1.5 py-0.5 text-[10px] text-cinnabar"
+            className="rounded bg-[var(--color-cinnabar-wash)] px-1.5 py-0.5 text-2xs text-cinnabar"
           >
             {reasonLabel(reason)}
           </span>
@@ -233,17 +239,18 @@ interface ExcludedRowProps {
 function ExcludedRow({ refItem, disabled, onRestore }: ExcludedRowProps) {
   return (
     <li className="flex items-center gap-2 rounded border border-dashed border-line px-2 py-1">
-      <span className="text-[10px] text-ink-soft">{kindLabel(refItem.kind)}</span>
+      <span className="text-2xs text-ink-soft">{kindLabel(refItem.kind)}</span>
       <span className="text-xs text-ink-soft line-through">{refItem.name}</span>
-      <button
-        type="button"
+      <Button
+        variant="ghost"
+        size="icon"
         disabled={disabled}
-        title="恢复（回到自动判定）"
+        aria-label={`恢复 ${refItem.name}（回到自动判定）`}
         onClick={() => onRestore(refItem)}
-        className="ml-auto rounded px-1.5 py-0.5 text-[11px] text-cinnabar hover:bg-[var(--color-cinnabar-wash)] disabled:opacity-50"
+        className="ml-auto text-cinnabar"
       >
-        ↩ 恢复
-      </button>
+        <Undo2 className="h-4 w-4" aria-hidden="true" />
+      </Button>
     </li>
   );
 }
@@ -257,27 +264,27 @@ interface RecentStepperProps {
 // 「关联近 N 章」步进器：覆盖近况摘要回看章数（钳在 [MIN, MAX]）。
 function RecentStepper({ value, disabled, onChange }: RecentStepperProps) {
   return (
-    <div className="flex items-center gap-1 text-[11px] text-ink-soft">
+    <div className="flex items-center gap-1 text-2xs text-ink-soft">
       <span>近</span>
-      <button
-        type="button"
+      <Button
+        variant="ghost"
+        size="icon"
         disabled={disabled || value <= RECENT_N_MIN}
         aria-label="减少关联章数"
         onClick={() => onChange(value - 1)}
-        className="rounded border border-line px-1.5 leading-tight hover:bg-panel disabled:opacity-40"
       >
-        −
-      </button>
+        <Minus className="h-4 w-4" aria-hidden="true" />
+      </Button>
       <span className="w-4 text-center tabular-nums text-ink">{value}</span>
-      <button
-        type="button"
+      <Button
+        variant="ghost"
+        size="icon"
         disabled={disabled || value >= RECENT_N_MAX}
         aria-label="增加关联章数"
         onClick={() => onChange(value + 1)}
-        className="rounded border border-line px-1.5 leading-tight hover:bg-panel disabled:opacity-40"
       >
-        +
-      </button>
+        <Plus className="h-4 w-4" aria-hidden="true" />
+      </Button>
       <span>章</span>
     </div>
   );
diff --git a/apps/web/components/workbench/ChapterList.tsx b/apps/web/components/workbench/ChapterList.tsx
index f64f408..6074a85 100644
--- a/apps/web/components/workbench/ChapterList.tsx
+++ b/apps/web/components/workbench/ChapterList.tsx
@@ -17,7 +17,7 @@ export function ChapterList({
   currentChapterNo,
 }: ChapterListProps) {
   return (
-    <aside className="hidden border-r border-line bg-panel py-4 lg:block">
+    <aside className="hidden border-r border-line bg-panel py-4 xl:block">
       <ChapterListContent
         projectId={projectId}
         chapters={chapters}
diff --git a/apps/web/components/workbench/Editor.tsx b/apps/web/components/workbench/Editor.tsx
index 2a92fe7..3ff184c 100644
--- a/apps/web/components/workbench/Editor.tsx
+++ b/apps/web/components/workbench/Editor.tsx
@@ -2,6 +2,8 @@
 
 import { useEffect, useRef } from "react";
 
+import { cn, focusRing, proseBody } from "@/lib/ui/variants";
+
 interface EditorProps {
   value: string;
   onChange: (value: string) => void;
@@ -36,7 +38,11 @@ export function Editor({ value, onChange, streaming }: EditorProps) {
         readOnly={streaming}
         aria-busy={streaming}
         placeholder="夜色如墨……点击「写本章」让 AI 起草，或直接在此书写。"
-        className="block min-h-[60vh] w-full resize-none overflow-hidden bg-transparent font-serif text-[18px] leading-[1.9] text-ink placeholder:text-ink-soft/50 focus:outline-none"
+        className={cn(
+          proseBody,
+          "block min-h-[60vh] w-full resize-none overflow-hidden rounded bg-transparent text-ink placeholder:text-ink-soft/50",
+          focusRing,
+        )}
       />
       {streaming ? (
         <span
diff --git a/apps/web/components/workbench/Workbench.tsx b/apps/web/components/workbench/Workbench.tsx
index c8175d0..abe7203 100644
--- a/apps/web/components/workbench/Workbench.tsx
+++ b/apps/web/components/workbench/Workbench.tsx
@@ -4,6 +4,7 @@ import Link from "next/link";
 import { useEffect, useId, useRef, useState, type RefObject } from "react";
 import {
   BookOpen,
+  ChevronDown,
   ClipboardCheck,
   FileText,
   Library,
@@ -15,6 +16,7 @@ import {
 
 import { AppShell } from "@/components/AppShell";
 import { Drawer } from "@/components/Drawer";
+import { ThinkingIndicator } from "@/components/ThinkingIndicator";
 import { Button } from "@/components/ui/Button";
 import { SectionHeader } from "@/components/ui/SectionHeader";
 import { StatusNote } from "@/components/ui/StatusNote";
@@ -102,9 +104,27 @@ export function Workbench({
     autosave.onChange(value);
   };
 
-  const wordCount = text.length;
+  // 字数统计非空白字符（与中文读者直觉一致：标点/空格不计入正文体量）。
+  const wordCount = text.replace(/\s+/g, "").length;
   const closePanel = (): void => setMobilePanel(null);
 
+  // 流式里程碑播报（仅终结句，非逐 token）：完成/停止/失败时写入 role=status 区。
+  const liveMessage = ((): string => {
+    switch (stream.state.phase) {
+      case "done":
+        return `本章生成完成，共 ${wordCount} 字`;
+      case "aborted":
+        return "已停止";
+      case "error":
+        return stream.state.error
+          ? friendlyError(stream.state.error.code, stream.state.error.message)
+              .text
+          : "本章生成失败，请稍后重试。";
+      default:
+        return "";
+    }
+  })();
+
   return (
     <AppShell
       title={`〈${project.title}〉`}
@@ -112,7 +132,7 @@ export function Workbench({
       projectId={project.id}
       activeNav="write"
     >
-      <div className="grid min-h-[calc(100vh-var(--chrome,4rem))] grid-cols-1 lg:h-[calc(100vh-var(--chrome,4rem))] lg:grid-cols-[12rem_1fr_18rem]">
+      <div className="grid min-h-[calc(100vh-var(--chrome,4rem))] grid-cols-1 xl:h-[calc(100vh-var(--chrome,4rem))] xl:grid-cols-[12rem_1fr_18rem]">
         <ChapterList
           projectId={project.id}
           chapters={chapters}
@@ -148,6 +168,7 @@ export function Workbench({
             saveStatus={autosave.status}
             streaming={stream.isStreaming}
             streamError={stream.state.error}
+            liveMessage={liveMessage}
             onWrite={onWrite}
             onStop={stream.stop}
           />
@@ -156,7 +177,7 @@ export function Workbench({
         <ChapterAssistant projectId={project.id} chapterNo={chapterNo} />
       </div>
 
-      {/* 移动端：目录 / 本章助手经抽屉触达（桌面已在栅格里，抽屉 lg:hidden）。 */}
+      {/* 窄屏 / 中屏(1024–1280)：目录 / 本章助手经抽屉触达；≥xl 已在三栏栅格里直显。 */}
       <Drawer
         open={mobilePanel === "chapters"}
         onClose={closePanel}
@@ -199,7 +220,7 @@ function MobileContextBar({
   assistantTriggerRef,
 }: MobileContextBarProps) {
   return (
-    <div className="flex items-center justify-between gap-2 border-b border-line bg-panel px-4 py-2 lg:hidden">
+    <div className="flex items-center justify-between gap-2 border-b border-line bg-panel px-4 py-2 xl:hidden">
       <Button
         ref={chapterTriggerRef}
         onClick={onOpenChapters}
@@ -243,12 +264,18 @@ function DirectivePanel({
   const panelId = useId();
   const activeCount = presetIds.length + (directive.trim().length > 0 ? 1 : 0);
   return (
-    <details className="border-b border-line bg-panel px-4 py-3 sm:px-6">
+    <details className="group border-b border-line bg-panel px-4 py-3 sm:px-6">
       <summary
         className="flex cursor-pointer list-none items-center justify-between gap-3 text-sm text-ink-soft hover:text-cinnabar"
         aria-controls={panelId}
       >
-        <span className="font-serif text-base text-ink">本章生成控制台</span>
+        <span className="flex items-center gap-2 font-serif text-base text-ink">
+          <ChevronDown
+            className="h-4 w-4 text-ink-soft transition-transform group-open:rotate-180"
+            aria-hidden="true"
+          />
+          本章写作指令
+        </span>
         <span className="rounded border border-line bg-bg px-2 py-0.5 text-xs text-ink-soft">
           {activeCount > 0 ? `${activeCount} 项指令` : "可选"}
         </span>
@@ -327,6 +354,8 @@ interface ToolbarProps {
   saveStatus: ReturnType<typeof useAutosave>["status"];
   streaming: boolean;
   streamError: { code: string; message: string } | null;
+  // 流式里程碑播报句（完成/停止/失败）；仅在 role=status 区出现，不逐 token 刷新。
+  liveMessage: string;
   onWrite: () => void;
   onStop: () => void;
 }
@@ -339,6 +368,7 @@ function Toolbar({
   saveStatus,
   streaming,
   streamError,
+  liveMessage,
   onWrite,
   onStop,
 }: ToolbarProps) {
@@ -359,14 +389,26 @@ function Toolbar({
           </Button>
         )}
         {streaming ? (
-          <span className="font-mono text-xs text-cinnabar motion-safe:animate-pulse">
-            生成中… {wordCount.toLocaleString("en-US")} 字
+          // ThinkingIndicator 自带 role=status，开始时播报一次「生成中」；
+          // 易变字数 aria-hidden，仅供视觉，不逐 token 打扰屏读。
+          <span className="inline-flex items-center gap-2">
+            <ThinkingIndicator label="生成中" className="text-xs text-cinnabar" />
+            <span
+              aria-hidden="true"
+              className="font-mono text-xs text-cinnabar"
+            >
+              {wordCount} 字
+            </span>
           </span>
         ) : (
           <span className="font-mono text-xs text-ink-soft">
-            字数 {wordCount.toLocaleString("en-US")}
+            字数 {wordCount}
           </span>
         )}
+        {/* 终结句播报区：完成/停止/失败时写入，屏读只播报里程碑。 */}
+        <span className="sr-only" role="status" aria-live="polite">
+          {liveMessage}
+        </span>
         <Link
           href={`/projects/${projectId}/outline`}
           className={buttonClass({ variant: "secondary", size: "sm" })}
@@ -393,7 +435,11 @@ function Toolbar({
           审稿
         </Link>
         </div>
-        <span className="min-w-0 font-mono text-xs text-ink-soft sm:ml-auto">
+        <span
+          role="status"
+          aria-live="polite"
+          className="min-w-0 font-mono text-xs text-ink-soft sm:ml-auto"
+        >
           <FileText className="mr-1 inline h-3.5 w-3.5" aria-hidden="true" />
           {saveStatus === "saving"
             ? "保存中…"