diff --git a/src/modules/error-book/actions.ts b/src/modules/error-book/actions.ts
index 639daf6..d5a5802 100644
--- a/src/modules/error-book/actions.ts
+++ b/src/modules/error-book/actions.ts
@@ -58,16 +58,14 @@ export async function getErrorBookItemsAction(
       }
     }
 
-    const status = params.status && params.status !== "all"
-      ? (z.enum(["new", "learning", "mastered", "archived"]).safeParse(params.status).success
-          ? (params.status as "new" | "learning" | "mastered" | "archived")
-          : undefined)
+    const statusParse = z.enum(["new", "learning", "mastered", "archived"]).safeParse(params.status)
+    const status = params.status && params.status !== "all" && statusParse.success
+      ? statusParse.data
       : undefined
 
-    const sourceType = params.sourceType && params.sourceType !== "all"
-      ? (z.enum(["exam", "homework", "manual"]).safeParse(params.sourceType).success
-          ? (params.sourceType as "exam" | "homework" | "manual")
-          : undefined)
+    const sourceTypeParse = z.enum(["exam", "homework", "manual"]).safeParse(params.sourceType)
+    const sourceType = params.sourceType && params.sourceType !== "all" && sourceTypeParse.success
+      ? sourceTypeParse.data
       : undefined
 
     const data = await getErrorBookItems({
diff --git a/src/modules/error-book/components/add-error-book-dialog.tsx b/src/modules/error-book/components/add-error-book-dialog.tsx
index 40326ed..5dcd71e 100644
--- a/src/modules/error-book/components/add-error-book-dialog.tsx
+++ b/src/modules/error-book/components/add-error-book-dialog.tsx
@@ -3,6 +3,7 @@
 import { useState, useTransition, useEffect } from "react"
 import { Plus } from "lucide-react"
 import { toast } from "sonner"
+import { useTranslations } from "next-intl"
 
 import {
   Dialog,
@@ -23,53 +24,44 @@ import {
   SelectValue,
 } from "@/shared/components/ui/select"
 import { Textarea } from "@/shared/components/ui/textarea"
-import { getQuestionsAction } from "@/modules/questions/actions"
 import { createErrorBookItemAction } from "../actions"
 import { COMMON_ERROR_TAGS } from "../types"
 
-export function AddErrorBookDialog() {
+interface QuestionOption {
+  id: string
+  preview: string
+}
+
+interface AddErrorBookDialogProps {
+  /** 预加载的题目选项（若提供则直接使用，不再调用 onLoadQuestions） */
+  questionOptions?: QuestionOption[]
+  /** 懒加载题目选项的回调（对话框打开时调用） */
+  onLoadQuestions?: () => Promise<QuestionOption[]>
+}
+
+export function AddErrorBookDialog({
+  questionOptions: questionOptionsProp,
+  onLoadQuestions,
+}: AddErrorBookDialogProps) {
+  const t = useTranslations("error-book")
   const [open, setOpen] = useState(false)
   const [isPending, startTransition] = useTransition()
   const [questionId, setQuestionId] = useState("")
   const [note, setNote] = useState("")
   const [errorTags, setErrorTags] = useState<string[]>([])
-  const [questionOptions, setQuestionOptions] = useState<Array<{
-    id: string
-    preview: string
-  }>>([])
+  const [loadedOptions, setLoadedOptions] = useState<QuestionOption[]>([])
 
-  function extractPreview(content: unknown): string {
-    if (typeof content === "string") return content.slice(0, 60)
-    if (Array.isArray(content)) {
-      const texts: string[] = []
-      for (const node of content) {
-        if (typeof node === "string") texts.push(node)
-        else if (typeof node === "object" && node !== null) {
-          const n = node as Record<string, unknown>
-          if (typeof n.text === "string") texts.push(n.text)
-        }
-      }
-      return texts.join("").slice(0, 60)
-    }
-    return "题目"
-  }
+  const questionOptions = questionOptionsProp ?? loadedOptions
 
   useEffect(() => {
-    if (open && questionOptions.length === 0) {
-      getQuestionsAction({ pageSize: 100 })
-        .then((res) => {
-          if (res.success && res.data) {
-            setQuestionOptions(
-              res.data.data.map((q) => ({
-                id: q.id,
-                preview: extractPreview(q.content),
-              }))
-            )
-          }
+    if (open && onLoadQuestions && loadedOptions.length === 0 && !questionOptionsProp) {
+      onLoadQuestions()
+        .then((options) => {
+          setLoadedOptions(options)
         })
         .catch(() => {})
     }
-  }, [open, questionOptions.length])
+  }, [open, onLoadQuestions, loadedOptions.length, questionOptionsProp])
 
   function toggleTag(tag: string) {
     setErrorTags((prev) =>
@@ -79,7 +71,7 @@ export function AddErrorBookDialog() {
 
   function handleSubmit() {
     if (!questionId) {
-      toast.error("请选择题目")
+      toast.error(t("messages.selectQuestion"))
       return
     }
     startTransition(async () => {
@@ -90,13 +82,13 @@ export function AddErrorBookDialog() {
       )
       const res = await createErrorBookItemAction(undefined, formData)
       if (res.success) {
-        toast.success(res.message ?? "已添加")
+        toast.success(res.message ?? t("messages.addedShort"))
         setOpen(false)
         setQuestionId("")
         setNote("")
         setErrorTags([])
       } else {
-        toast.error(res.message ?? "添加失败")
+        toast.error(res.message ?? t("messages.addFailed"))
       }
     })
   }
@@ -106,23 +98,23 @@ export function AddErrorBookDialog() {
       <DialogTrigger asChild>
         <Button>
           <Plus className="h-4 w-4" data-icon="inline-start" />
-          手动添加
+          {t("actions.add")}
         </Button>
       </DialogTrigger>
       <DialogContent className="max-w-lg">
         <DialogHeader>
-          <DialogTitle>添加错题</DialogTitle>
+          <DialogTitle>{t("addDialog.title")}</DialogTitle>
           <DialogDescription>
-            从题库中选择题目，添加到你的错题本。你也可以在完成作业/考试后自动采集。
+            {t("addDialog.description")}
           </DialogDescription>
         </DialogHeader>
 
         <div className="space-y-4">
           <div className="space-y-2">
-            <Label htmlFor="question">选择题目</Label>
+            <Label htmlFor="question">{t("addDialog.selectQuestion")}</Label>
             <Select value={questionId} onValueChange={setQuestionId}>
               <SelectTrigger id="question">
-                <SelectValue placeholder="从题库中选择..." />
+                <SelectValue placeholder={t("addDialog.selectPlaceholder")} />
               </SelectTrigger>
               <SelectContent>
                 {questionOptions.map((q) => (
@@ -135,18 +127,18 @@ export function AddErrorBookDialog() {
           </div>
 
           <div className="space-y-2">
-            <Label htmlFor="note">学习笔记（可选）</Label>
+            <Label htmlFor="note">{t("addDialog.noteLabel")}</Label>
             <Textarea
               id="note"
               value={note}
               onChange={(e) => setNote(e.target.value)}
-              placeholder="记录错误原因、解题思路..."
+              placeholder={t("addDialog.notePlaceholder")}
               maxLength={2000}
             />
           </div>
 
           <div className="space-y-2">
-            <Label>错误原因标签</Label>
+            <Label>{t("addDialog.errorTagsLabel")}</Label>
             <div className="flex flex-wrap gap-1">
               {COMMON_ERROR_TAGS.map((tag) => (
                 <Button
@@ -165,10 +157,10 @@ export function AddErrorBookDialog() {
 
         <DialogFooter>
           <Button variant="outline" onClick={() => setOpen(false)}>
-            取消
+            {t("actions.cancel")}
           </Button>
           <Button disabled={isPending || !questionId} onClick={handleSubmit}>
-            {isPending ? "添加中..." : "添加"}
+            {isPending ? t("actions.adding") : t("actions.add")}
           </Button>
         </DialogFooter>
       </DialogContent>
diff --git a/src/modules/error-book/components/analytics-stats-cards.tsx b/src/modules/error-book/components/analytics-stats-cards.tsx
index df11467..4fc2d6b 100644
--- a/src/modules/error-book/components/analytics-stats-cards.tsx
+++ b/src/modules/error-book/components/analytics-stats-cards.tsx
@@ -1,4 +1,7 @@
+"use client"
+
 import { BookOpen, Brain, CheckCircle2, Clock, TrendingUp } from "lucide-react"
+import { useTranslations } from "next-intl"
 import { Card, CardContent } from "@/shared/components/ui/card"
 import { cn } from "@/shared/lib/utils"
 
@@ -26,43 +29,52 @@ export function AnalyticsStatsCards({
   knowledgePointCount,
   className,
 }: AnalyticsStatsCardsProps) {
+  const t = useTranslations("error-book")
+  const avg = (totalStudents > 0 ? totalErrorItems / totalStudents : 0).toFixed(1)
+
   const cards = [
     {
-      label: "覆盖学生",
+      label: t("analyticsStats.coverage"),
       value: studentsWithErrorBook,
-      sub: `/ ${totalStudents} 人`,
+      sub: t("analyticsStats.coverageSub", { total: totalStudents }),
       icon: BookOpen,
       color: "text-blue-600 dark:text-blue-400",
       bg: "bg-blue-50 dark:bg-blue-950/30",
     },
     {
-      label: "错题总数",
+      label: t("analyticsStats.totalErrors"),
       value: totalErrorItems,
-      sub: `人均 ${(totalStudents > 0 ? totalErrorItems / totalStudents : 0).toFixed(1)} 题`,
+      sub: t("analyticsStats.totalErrorsSub", { avg }),
       icon: TrendingUp,
       color: "text-rose-600 dark:text-rose-400",
       bg: "bg-rose-50 dark:bg-rose-950/30",
     },
     {
-      label: "平均掌握率",
+      label: t("analyticsStats.avgMastery"),
       value: `${Math.round(averageMasteryRate * 100)}%`,
-      sub: averageMasteryRate >= 0.6 ? "整体良好" : "需加强",
+      sub: averageMasteryRate >= 0.6
+        ? t("analyticsStats.avgMasteryGood")
+        : t("analyticsStats.avgMasteryNeedImprove"),
       icon: CheckCircle2,
       color: "text-emerald-600 dark:text-emerald-400",
       bg: "bg-emerald-50 dark:bg-emerald-950/30",
     },
     {
-      label: "待复习",
+      label: t("analyticsStats.dueReview"),
       value: dueReviewCount,
-      sub: dueReviewCount > 0 ? "需要关注" : "无到期",
+      sub: dueReviewCount > 0
+        ? t("analyticsStats.dueReviewNeedAttention")
+        : t("analyticsStats.dueReviewNone"),
       icon: Clock,
       color: "text-amber-600 dark:text-amber-400",
       bg: "bg-amber-50 dark:bg-amber-950/30",
     },
     {
-      label: "涉及知识点",
+      label: t("analyticsStats.knowledgePoints"),
       value: knowledgePointCount ?? 0,
-      sub: knowledgePointCount && knowledgePointCount > 5 ? "范围较广" : "集中",
+      sub: knowledgePointCount && knowledgePointCount > 5
+        ? t("analyticsStats.knowledgePointsWide")
+        : t("analyticsStats.knowledgePointsFocused"),
       icon: Brain,
       color: "text-purple-600 dark:text-purple-400",
       bg: "bg-purple-50 dark:bg-purple-950/30",
diff --git a/src/modules/error-book/components/chapter-weakness-chart.tsx b/src/modules/error-book/components/chapter-weakness-chart.tsx
index 5f3d3ea..ac56e8b 100644
--- a/src/modules/error-book/components/chapter-weakness-chart.tsx
+++ b/src/modules/error-book/components/chapter-weakness-chart.tsx
@@ -1,6 +1,7 @@
 "use client"
 
 import { Bar, BarChart, CartesianGrid, XAxis, YAxis, Cell } from "recharts"
+import { useTranslations } from "next-intl"
 import {
   ChartContainer,
   ChartTooltip,
@@ -18,12 +19,36 @@ interface ChapterWeaknessChartProps {
   className?: string
 }
 
+interface ChapterChartPayload {
+  name: string
+  errorCount: number
+  masteredCount: number
+  masteryRate: number
+  knowledgePointCount: number
+  topKps: Array<{ knowledgePointName: string; errorCount: number }>
+}
+
+function isChapterChartPayload(v: unknown): v is ChapterChartPayload {
+  if (typeof v !== "object" || v === null) return false
+  // 从 unknown 转换：类型守卫内需要属性访问来校验字段类型
+  const obj = v as Record<string, unknown>
+  return (
+    typeof obj.name === "string" &&
+    typeof obj.errorCount === "number" &&
+    typeof obj.masteredCount === "number" &&
+    typeof obj.masteryRate === "number" &&
+    typeof obj.knowledgePointCount === "number"
+  )
+}
+
 /**
  * 章节薄弱度图表（哪些课在错）
  * 横向柱状图，按错题数降序
  * 每个柱子可展开显示该章节下错得最多的知识点
  */
 export function ChapterWeaknessChart({ data, className }: ChapterWeaknessChartProps) {
+  const t = useTranslations("error-book")
+
   if (data.length === 0) return null
 
   const chartData = data.map((d) => ({
@@ -37,7 +62,7 @@ export function ChapterWeaknessChart({ data, className }: ChapterWeaknessChartPr
 
   const chartConfig: ChartConfig = {
     errorCount: {
-      label: "错题数",
+      label: t("chapterChart.errorCount"),
       color: "var(--color-chart-2)",
     },
   }
@@ -45,10 +70,14 @@ export function ChapterWeaknessChart({ data, className }: ChapterWeaknessChartPr
   return (
     <Card className={cn("overflow-hidden", className)}>
       <CardHeader>
-        <CardTitle className="text-base">章节错题分布（哪些课在错）</CardTitle>
+        <CardTitle className="text-base">{t("chapterChart.title")}</CardTitle>
       </CardHeader>
       <CardContent className="space-y-4">
-        <ChartContainer config={chartConfig} className="h-[300px] w-full">
+        <ChartContainer
+          config={chartConfig}
+          className="h-[300px] w-full"
+          aria-label={t("chapterChart.title")}
+        >
           <BarChart
             data={chartData}
             layout="vertical"
@@ -71,29 +100,32 @@ export function ChapterWeaknessChart({ data, className }: ChapterWeaknessChartPr
                 <ChartTooltipContent
                   className="w-[280px]"
                   formatter={(payload: unknown) => {
-                    const p = payload as unknown as {
-                      name: string
-                      errorCount: number
-                      masteredCount: number
-                      masteryRate: number
-                      knowledgePointCount: number
-                      topKps: Array<{ knowledgePointName: string; errorCount: number }>
-                    }
+                    if (!isChapterChartPayload(payload)) return null
                     return (
                       <div className="space-y-1.5">
-                        <div className="font-medium">{p.name}</div>
+                        <div className="font-medium">{payload.name}</div>
                         <div className="text-muted-foreground">
-                          错题数：<span className="font-medium text-foreground">{p.errorCount}</span>
-                          <span className="ml-2">已掌握：<span className="font-medium text-emerald-600">{p.masteredCount}</span></span>
+                          {t("chapterChart.errorCount")}：
+                          <span className="font-medium text-foreground">{payload.errorCount}</span>
+                          <span className="ml-2">
+                            {t("chapterChart.masteredLabel")}：
+                            <span className="font-medium text-emerald-600">{payload.masteredCount}</span>
+                          </span>
                         </div>
                         <div className="text-muted-foreground">
-                          掌握率：<span className="font-medium text-foreground">{p.masteryRate}%</span>
-                          <span className="ml-2">知识点数：<span className="font-medium text-foreground">{p.knowledgePointCount}</span></span>
+                          {t("chapterChart.masteryRateLabel")}：
+                          <span className="font-medium text-foreground">{payload.masteryRate}%</span>
+                          <span className="ml-2">
+                            {t("chapterChart.knowledgePointCount")}：
+                            <span className="font-medium text-foreground">{payload.knowledgePointCount}</span>
+                          </span>
                         </div>
-                        {p.topKps && p.topKps.length > 0 ? (
+                        {payload.topKps && payload.topKps.length > 0 ? (
                           <div className="border-t pt-1.5 mt-1.5">
-                            <div className="text-xs text-muted-foreground mb-1">薄弱知识点：</div>
-                            {p.topKps.map((kp) => (
+                            <div className="text-xs text-muted-foreground mb-1">
+                              {t("chapterChart.weakKpsLabel")}
+                            </div>
+                            {payload.topKps.map((kp) => (
                               <div key={kp.knowledgePointName} className="flex justify-between text-xs">
                                 <span>{kp.knowledgePointName}</span>
                                 <span className="font-medium text-rose-600">{kp.errorCount}</span>
@@ -129,7 +161,7 @@ export function ChapterWeaknessChart({ data, className }: ChapterWeaknessChartPr
                 <div className="flex items-center gap-2">
                   <span className="truncate font-medium text-sm">{chapter.chapterTitle}</span>
                   <Badge variant="outline" className="shrink-0 text-xs">
-                    {chapter.knowledgePointCount} 个知识点
+                    {t("chapterChart.knowledgePointBadge", { count: chapter.knowledgePointCount })}
                   </Badge>
                 </div>
                 {chapter.topKnowledgePoints.length > 0 ? (
@@ -144,7 +176,9 @@ export function ChapterWeaknessChart({ data, className }: ChapterWeaknessChartPr
               </div>
               <div className="flex shrink-0 flex-col items-end gap-0.5 text-xs">
                 <span className="font-bold text-rose-600">{chapter.errorCount}</span>
-                <span className="text-muted-foreground">掌握 {Math.round(chapter.masteryRate * 100)}%</span>
+                <span className="text-muted-foreground">
+                  {t("chapterChart.masteryRateLabel")} {Math.round(chapter.masteryRate * 100)}%
+                </span>
               </div>
             </div>
           ))}
diff --git a/src/modules/error-book/components/class-error-bar-chart.tsx b/src/modules/error-book/components/class-error-bar-chart.tsx
index ae637ac..f767f9e 100644
--- a/src/modules/error-book/components/class-error-bar-chart.tsx
+++ b/src/modules/error-book/components/class-error-bar-chart.tsx
@@ -1,6 +1,7 @@
 "use client"
 
 import { Bar, BarChart, CartesianGrid, XAxis, YAxis, Cell } from "recharts"
+import { useTranslations } from "next-intl"
 import {
   ChartContainer,
   ChartTooltip,
@@ -17,6 +18,29 @@ interface ClassErrorBarChartProps {
   className?: string
 }
 
+interface ClassBarChartPayload {
+  name: string
+  totalErrorItems: number
+  studentCount: number
+  averageErrorPerStudent: number
+  averageMasteryRate: number
+  dueReviewCount: number
+}
+
+function isClassBarChartPayload(v: unknown): v is ClassBarChartPayload {
+  if (typeof v !== "object" || v === null) return false
+  // 从 unknown 转换：类型守卫内需要属性访问来校验字段类型
+  const obj = v as Record<string, unknown>
+  return (
+    typeof obj.name === "string" &&
+    typeof obj.totalErrorItems === "number" &&
+    typeof obj.studentCount === "number" &&
+    typeof obj.averageErrorPerStudent === "number" &&
+    typeof obj.averageMasteryRate === "number" &&
+    typeof obj.dueReviewCount === "number"
+  )
+}
+
 const CHART_COLORS = [
   "var(--color-chart-1)",
   "var(--color-chart-2)",
@@ -31,6 +55,8 @@ const CHART_COLORS = [
  * 颜色按班级区分，tooltip 显示学生数/人均/掌握率
  */
 export function ClassErrorBarChart({ data, className }: ClassErrorBarChartProps) {
+  const t = useTranslations("error-book")
+
   if (data.length === 0) return null
 
   const chartData = data.map((d) => ({
@@ -44,7 +70,7 @@ export function ClassErrorBarChart({ data, className }: ClassErrorBarChartProps)
 
   const chartConfig: ChartConfig = {
     totalErrorItems: {
-      label: "错题总数",
+      label: t("classErrorBar.errorCount"),
       color: "var(--color-chart-1)",
     },
   }
@@ -52,10 +78,14 @@ export function ClassErrorBarChart({ data, className }: ClassErrorBarChartProps)
   return (
     <Card className={cn("overflow-hidden", className)}>
       <CardHeader>
-        <CardTitle className="text-base">各班级错题数对比</CardTitle>
+        <CardTitle className="text-base">{t("classErrorBar.title")}</CardTitle>
       </CardHeader>
       <CardContent>
-        <ChartContainer config={chartConfig} className="h-[280px] w-full">
+        <ChartContainer
+          config={chartConfig}
+          className="h-[280px] w-full"
+          aria-label={t("classErrorBar.title")}
+        >
           <BarChart data={chartData} margin={{ left: 8, right: 8, top: 8, bottom: 8 }}>
             <CartesianGrid vertical={false} strokeDasharray="4 4" strokeOpacity={0.4} />
             <XAxis
@@ -73,31 +103,29 @@ export function ClassErrorBarChart({ data, className }: ClassErrorBarChartProps)
                 <ChartTooltipContent
                   className="w-[220px]"
                   formatter={(payload: unknown) => {
-                    const p = payload as unknown as {
-                      name: string
-                      totalErrorItems: number
-                      studentCount: number
-                      averageErrorPerStudent: number
-                      averageMasteryRate: number
-                      dueReviewCount: number
-                    }
+                    if (!isClassBarChartPayload(payload)) return null
                     return (
                       <div className="space-y-1.5">
-                        <div className="font-medium">{p.name}</div>
+                        <div className="font-medium">{payload.name}</div>
                         <div className="text-muted-foreground">
-                          错题总数：<span className="font-medium text-foreground">{p.totalErrorItems}</span>
+                          {t("classErrorBar.errorCount")}：
+                          <span className="font-medium text-foreground">{payload.totalErrorItems}</span>
                         </div>
                         <div className="text-muted-foreground">
-                          学生数：<span className="font-medium text-foreground">{p.studentCount}</span>
+                          {t("classErrorBar.studentCount")}：
+                          <span className="font-medium text-foreground">{payload.studentCount}</span>
                         </div>
                         <div className="text-muted-foreground">
-                          人均错题：<span className="font-medium text-foreground">{p.averageErrorPerStudent}</span>
+                          {t("classErrorBar.avgPerStudent")}：
+                          <span className="font-medium text-foreground">{payload.averageErrorPerStudent}</span>
                         </div>
                         <div className="text-muted-foreground">
-                          平均掌握率：<span className="font-medium text-foreground">{p.averageMasteryRate}%</span>
+                          {t("classErrorBar.avgMastery")}：
+                          <span className="font-medium text-foreground">{payload.averageMasteryRate}%</span>
                         </div>
                         <div className="text-muted-foreground">
-                          待复习：<span className="font-medium text-rose-600">{p.dueReviewCount}</span>
+                          {t("classErrorBar.dueReview")}：
+                          <span className="font-medium text-rose-600">{payload.dueReviewCount}</span>
                         </div>
                       </div>
                     )
diff --git a/src/modules/error-book/components/class-error-overview.tsx b/src/modules/error-book/components/class-error-overview.tsx
deleted file mode 100644
index 04e91e8..0000000
--- a/src/modules/error-book/components/class-error-overview.tsx
+++ /dev/null
@@ -1,198 +0,0 @@
-import Link from "next/link"
-import { Users, AlertTriangle, TrendingUp, Target } from "lucide-react"
-
-import { Card, CardContent, CardHeader, CardTitle } from "@/shared/components/ui/card"
-import { StatCard } from "@/shared/components/ui/stat-card"
-import { Badge } from "@/shared/components/ui/badge"
-import { Progress } from "@/shared/components/ui/progress"
-import { EmptyState } from "@/shared/components/ui/empty-state"
-import { formatDate, formatNumber } from "@/shared/lib/utils"
-import type {
-  StudentErrorBookSummary,
-  KnowledgePointWeakness,
-  SubjectErrorDistribution,
-} from "../types"
-
-interface ClassErrorBookOverviewProps {
-  totalStudents: number
-  studentsWithErrorBook: number
-  totalErrorItems: number
-  averageMasteryRate: number
-  topWeakKnowledgePoints: KnowledgePointWeakness[]
-  subjectDistribution: SubjectErrorDistribution[]
-}
-
-export function ClassErrorBookOverview({
-  totalStudents,
-  studentsWithErrorBook,
-  totalErrorItems,
-  averageMasteryRate,
-  topWeakKnowledgePoints,
-  subjectDistribution,
-}: ClassErrorBookOverviewProps) {
-  return (
-    <div className="space-y-6">
-      <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-4">
-        <StatCard
-          title="覆盖学生"
-          value={`${studentsWithErrorBook}/${totalStudents}`}
-          icon={Users}
-          description="有错题记录的学生数"
-        />
-        <StatCard
-          title="错题总数"
-          value={totalErrorItems}
-          icon={AlertTriangle}
-          color="text-rose-500"
-          description="班级累计错题"
-        />
-        <StatCard
-          title="平均掌握率"
-          value={`${formatNumber(averageMasteryRate * 100, 0)}%`}
-          icon={TrendingUp}
-          color="text-emerald-500"
-          description="已掌握错题占比"
-        />
-        <StatCard
-          title="薄弱知识点"
-          value={topWeakKnowledgePoints.length}
-          icon={Target}
-          color="text-amber-500"
-          description="需重点讲解"
-        />
-      </div>
-
-      <div className="grid gap-4 md:grid-cols-2">
-        {/* 薄弱知识点 */}
-        <Card>
-          <CardHeader>
-            <CardTitle className="flex items-center gap-2 text-base">
-              <Target className="h-4 w-4" />
-              薄弱知识点 Top 10
-            </CardTitle>
-          </CardHeader>
-          <CardContent>
-            {topWeakKnowledgePoints.length === 0 ? (
-              <p className="text-sm text-muted-foreground py-6 text-center">
-                暂无数据
-              </p>
-            ) : (
-              <div className="space-y-3">
-                {topWeakKnowledgePoints.map((kp, idx) => (
-                  <div key={kp.knowledgePointId} className="space-y-1">
-                    <div className="flex items-center justify-between text-sm">
-                      <span className="flex items-center gap-2">
-                        <Badge variant="outline" className="w-6 justify-center">
-                          {idx + 1}
-                        </Badge>
-                        <span className="line-clamp-1">{kp.knowledgePointName}</span>
-                      </span>
-                      <span className="text-muted-foreground">
-                        {kp.errorCount} 错 · {formatNumber(kp.masteryRate * 100, 0)}% 掌握
-                      </span>
-                    </div>
-                    <Progress value={kp.masteryRate * 100} className="h-1.5" />
-                  </div>
-                ))}
-              </div>
-            )}
-          </CardContent>
-        </Card>
-
-        {/* 学科分布 */}
-        <Card>
-          <CardHeader>
-            <CardTitle className="text-base">学科错题分布</CardTitle>
-          </CardHeader>
-          <CardContent>
-            {subjectDistribution.length === 0 ? (
-              <p className="text-sm text-muted-foreground py-6 text-center">
-                暂无数据
-              </p>
-            ) : (
-              <div className="space-y-3">
-                {subjectDistribution.map((s) => (
-                  <div key={s.subjectId ?? "none"} className="space-y-1">
-                    <div className="flex items-center justify-between text-sm">
-                      <span>{s.subjectName}</span>
-                      <span className="text-muted-foreground">
-                        {s.errorCount} 错 · {formatNumber(s.masteryRate * 100, 0)}% 掌握
-                      </span>
-                    </div>
-                    <Progress value={s.masteryRate * 100} className="h-1.5" />
-                  </div>
-                ))}
-              </div>
-            )}
-          </CardContent>
-        </Card>
-      </div>
-    </div>
-  )
-}
-
-interface StudentErrorTableProps {
-  students: StudentErrorBookSummary[]
-  studentNames: Map<string, string>
-  basePath: string
-}
-
-export function StudentErrorTable({ students, studentNames, basePath }: StudentErrorTableProps) {
-  if (students.length === 0) {
-    return (
-      <EmptyState
-        icon={Users}
-        title="暂无学生错题数据"
-        description="学生完成作业或考试后，错题数据会自动汇总到这里。"
-        className="h-[300px] bg-card"
-      />
-    )
-  }
-
-  return (
-    <div className="rounded-md border bg-card">
-      <table className="w-full text-sm">
-        <thead>
-          <tr className="border-b bg-muted/50">
-            <th className="px-4 py-3 text-left font-medium">学生</th>
-            <th className="px-4 py-3 text-right font-medium">错题总数</th>
-            <th className="px-4 py-3 text-right font-medium">待学习</th>
-            <th className="px-4 py-3 text-right font-medium">学习中</th>
-            <th className="px-4 py-3 text-right font-medium">已掌握</th>
-            <th className="px-4 py-3 text-right font-medium">待复习</th>
-            <th className="px-4 py-3 text-right font-medium">掌握率</th>
-            <th className="px-4 py-3 text-right font-medium">最近活动</th>
-          </tr>
-        </thead>
-        <tbody>
-          {students.map((s) => {
-            const name = studentNames.get(s.studentId) ?? "未知"
-            return (
-              <tr key={s.studentId} className="border-b last:border-0 hover:bg-muted/30">
-                <td className="px-4 py-3">
-                  <Link
-                    href={`${basePath}?studentId=${s.studentId}`}
-                    className="font-medium hover:underline"
-                  >
-                    {name}
-                  </Link>
-                </td>
-                <td className="px-4 py-3 text-right">{s.totalCount}</td>
-                <td className="px-4 py-3 text-right text-blue-600 dark:text-blue-400">{s.newCount}</td>
-                <td className="px-4 py-3 text-right text-amber-600 dark:text-amber-400">{s.learningCount}</td>
-                <td className="px-4 py-3 text-right text-emerald-600 dark:text-emerald-400">{s.masteredCount}</td>
-                <td className="px-4 py-3 text-right text-rose-600 dark:text-rose-400">{s.dueReviewCount}</td>
-                <td className="px-4 py-3 text-right">
-                  {formatNumber(s.masteredRate * 100, 0)}%
-                </td>
-                <td className="px-4 py-3 text-right text-muted-foreground text-xs">
-                  {s.lastActivityAt ? formatDate(s.lastActivityAt) : "-"}
-                </td>
-              </tr>
-            )
-          })}
-        </tbody>
-      </table>
-    </div>
-  )
-}
diff --git a/src/modules/error-book/components/class-filter.tsx b/src/modules/error-book/components/class-filter.tsx
index 49a6c56..557ec25 100644
--- a/src/modules/error-book/components/class-filter.tsx
+++ b/src/modules/error-book/components/class-filter.tsx
@@ -1,6 +1,7 @@
 "use client"
 
 import { useRouter, useSearchParams } from "next/navigation"
+import { useTranslations } from "next-intl"
 import { cn } from "@/shared/lib/utils"
 import { Badge } from "@/shared/components/ui/badge"
 
@@ -25,6 +26,7 @@ export function ClassFilter({
 }: ClassFilterProps) {
   const router = useRouter()
   const searchParams = useSearchParams()
+  const t = useTranslations("error-book")
 
   const handleSelect = (classId: string) => {
     const params = new URLSearchParams(searchParams.toString())
@@ -42,6 +44,8 @@ export function ClassFilter({
     <div className="flex flex-wrap gap-2">
       <button
         type="button"
+        role="tab"
+        aria-selected={currentClassId === "all"}
         onClick={() => handleSelect("all")}
         className={cn(
           "inline-flex items-center gap-2 rounded-md border px-3 py-1.5 text-sm transition-colors",
@@ -50,7 +54,7 @@ export function ClassFilter({
             : "bg-card hover:bg-muted"
         )}
       >
-        <span className="font-medium">全部班级</span>
+        <span className="font-medium">{t("classFilter.all")}</span>
       </button>
       {classes.map((cls) => {
         const isActive = currentClassId === cls.classId
@@ -58,6 +62,8 @@ export function ClassFilter({
           <button
             key={cls.classId}
             type="button"
+            role="tab"
+            aria-selected={isActive}
             onClick={() => handleSelect(cls.classId)}
             className={cn(
               "inline-flex items-center gap-2 rounded-md border px-3 py-1.5 text-sm transition-colors",
@@ -71,7 +77,7 @@ export function ClassFilter({
               variant={isActive ? "secondary" : "outline"}
               className="text-xs"
             >
-              {cls.totalErrorItems} 错题
+              {t("classFilter.errorCount", { count: cls.totalErrorItems })}
             </Badge>
             {cls.dueReviewCount > 0 ? (
               <span
@@ -80,7 +86,7 @@ export function ClassFilter({
                   isActive ? "text-primary-foreground/80" : "text-rose-600"
                 )}
               >
-                {cls.dueReviewCount} 待复习
+                {t("classFilter.dueReview", { count: cls.dueReviewCount })}
               </span>
             ) : null}
           </button>
diff --git a/src/modules/error-book/components/error-book-detail-dialog.tsx b/src/modules/error-book/components/error-book-detail-dialog.tsx
index e9da598..9d9915d 100644
--- a/src/modules/error-book/components/error-book-detail-dialog.tsx
+++ b/src/modules/error-book/components/error-book-detail-dialog.tsx
@@ -1,7 +1,6 @@
 "use client"
 
 import { useState, useTransition } from "react"
-import { useRouter } from "next/navigation"
 import { useTranslations } from "next-intl"
 import { Archive, Trash2, FileText, Calendar, History, Target } from "lucide-react"
 import { toast } from "sonner"
@@ -37,64 +36,31 @@ import {
   type ErrorBookItem,
 } from "../types"
 import { ReviewButtons } from "./review-buttons"
-import { AiErrorBookAnalysis } from "@/modules/ai/components/ai-error-book-analysis"
-import { createPracticeSessionAction } from "@/modules/adaptive-practice/actions"
 
 interface ErrorBookDetailDialogProps {
   item: ErrorBookItemDetail | (Omit<ErrorBookItemDetail, "reviews"> & { reviews?: ErrorBookItemDetail["reviews"] })
   trigger: React.ReactNode
-  /** 当前学生 ID（用于 AI 薄弱点分析） */
+  /** 当前学生 ID（保留接口兼容，AI 分析已通过 aiAnalysisSlot 注入） */
   studentId?: string
-  /** 全部错题列表（用于 AI 薄弱点分析，不传则禁用 AI 分析） */
+  /** 全部错题列表（保留接口兼容，AI 分析已通过 aiAnalysisSlot 注入） */
   errorItems?: ErrorBookItem[]
+  /** AI 分析区域插槽（由父组件注入，未提供则不渲染） */
+  aiAnalysisSlot?: React.ReactNode
+  /** 发起变式练习回调（未提供则不渲染变式练习入口） */
+  onStartVariantPractice?: () => void
 }
 
-/**
- * 从题目内容中提取纯文本（用于 AI 相似题推荐）
- *
- * 类型收窄：从 unknown 逐步缩小到具体类型，避免使用 as 断言。
- */
-function extractQuestionText(content: unknown): string {
-  if (!content) return ""
-  if (typeof content === "string") return content
-  if (typeof content === "object" && content !== null && "text" in content) {
-    const textValue = (content as Record<string, unknown>).text
-    if (typeof textValue === "string") return textValue
-  }
-  try {
-    return JSON.stringify(content)
-  } catch {
-    return ""
-  }
-}
-
-/**
- * 将错题条目转换为 AI 薄弱点分析所需的输入格式
- */
-function mapErrorItemsForAnalysis(items: ErrorBookItem[]): Array<{
-  questionText: string
-  questionType: string
-  knowledgePointIds?: string[]
-  errorCount: number
-  masteryLevel: number
-}> {
-  return items.map((it) => ({
-    questionText: extractQuestionText(it.question?.content),
-    questionType: it.question?.type ?? "unknown",
-    knowledgePointIds: it.knowledgePointIds ?? undefined,
-    errorCount: it.reviewCount > 0 ? it.reviewCount : 1,
-    masteryLevel: it.masteryLevel,
-  }))
-}
-
-export function ErrorBookDetailDialog({ item, trigger, studentId, errorItems }: ErrorBookDetailDialogProps) {
+export function ErrorBookDetailDialog({
+  item,
+  trigger,
+  aiAnalysisSlot,
+  onStartVariantPractice,
+}: ErrorBookDetailDialogProps) {
   const [open, setOpen] = useState(false)
   const [isPending, startTransition] = useTransition()
   const [note, setNote] = useState(item.note ?? "")
   const [errorTags, setErrorTags] = useState<string[]>(item.errorTags ?? [])
-  const router = useRouter()
   const t = useTranslations("error-book")
-  const tPractice = useTranslations("practice")
 
   function handleSaveNote() {
     startTransition(async () => {
@@ -140,49 +106,12 @@ export function ErrorBookDetailDialog({ item, trigger, studentId, errorItems }:
     })
   }
 
-  /**
-   * 发起错题变式练习。
-   *
-   * 从当前错题出发，创建一个 error_variant 类型的练习会话，
-   * 使用该错题关联的原题进行针对性练习。
-   */
-  function handleStartVariantPractice() {
-    startTransition(async () => {
-      const formData = new FormData()
-      formData.append(
-        "json",
-        JSON.stringify({
-          practiceType: "error_variant",
-          subjectId: item.subjectId ?? undefined,
-          sourceMeta: {
-            errorBookItemIds: [item.id],
-            sourceQuestionIds: [item.questionId],
-          },
-          questionCount: 10,
-        }),
-      )
-      const res = await createPracticeSessionAction(undefined, formData)
-      if (res.success && res.data) {
-        toast.success(res.message ?? tPractice("starter.title"))
-        setOpen(false)
-        router.push(`/student/practice/${res.data.sessionId}`)
-      } else {
-        toast.error(res.message ?? t("messages.saveFailed"))
-      }
-    })
-  }
-
   function toggleTag(tag: string) {
     setErrorTags((prev) =>
       prev.includes(tag) ? prev.filter((t) => t !== tag) : [...prev, tag]
     )
   }
 
-  // AI 分析所需数据
-  const currentQuestionText = extractQuestionText(item.question?.content)
-  const currentQuestionType = item.question?.type
-  const aiErrorItems = errorItems ? mapErrorItemsForAnalysis(errorItems) : []
-
   return (
     <Dialog open={open} onOpenChange={setOpen}>
       <DialogTrigger asChild>{trigger}</DialogTrigger>
@@ -208,10 +137,10 @@ export function ErrorBookDetailDialog({ item, trigger, studentId, errorItems }:
           <DialogDescription className="flex items-center gap-3 text-xs">
             <span className="flex items-center gap-1">
               <Calendar className="h-3 w-3" />
-              添加于 {formatDate(item.createdAt)}
+              {t("itemCard.addedAt", { date: formatDate(item.createdAt) })}
             </span>
-            <span>掌握度: {item.masteryLevel}/5</span>
-            <span>复习 {item.reviewCount} 次</span>
+            <span>{t("itemCard.masteryOutOf", { level: item.masteryLevel })}</span>
+            <span>{t("itemCard.reviewTimes", { count: item.reviewCount })}</span>
           </DialogDescription>
         </DialogHeader>
 
@@ -219,7 +148,7 @@ export function ErrorBookDetailDialog({ item, trigger, studentId, errorItems }:
           <div className="space-y-4 pb-4">
             {/* 题目内容 */}
             <section>
-              <h4 className="mb-2 text-sm font-medium">题目</h4>
+              <h4 className="mb-2 text-sm font-medium">{t("detailDialog.question")}</h4>
               <div className="rounded-md border bg-muted/30 p-3 text-sm">
                 {item.question ? (
                   <pre className="whitespace-pre-wrap break-words font-sans">
@@ -228,7 +157,9 @@ export function ErrorBookDetailDialog({ item, trigger, studentId, errorItems }:
                       : JSON.stringify(item.question.content, null, 2)}
                   </pre>
                 ) : (
-                  <span className="text-muted-foreground">题目已删除</span>
+                  <span className="text-muted-foreground">
+                    {t("detailDialog.questionDeleted")}
+                  </span>
                 )}
               </div>
             </section>
@@ -239,7 +170,7 @@ export function ErrorBookDetailDialog({ item, trigger, studentId, errorItems }:
                 {item.studentAnswer !== null && item.studentAnswer !== undefined ? (
                   <div>
                     <h4 className="mb-2 text-sm font-medium text-rose-600 dark:text-rose-400">
-                      我的答案
+                      {t("detailDialog.myAnswer")}
                     </h4>
                     <div className="rounded-md border border-rose-200 bg-rose-50/50 p-3 text-sm dark:border-rose-900 dark:bg-rose-950/20">
                       <pre className="whitespace-pre-wrap break-words font-sans">
@@ -253,7 +184,7 @@ export function ErrorBookDetailDialog({ item, trigger, studentId, errorItems }:
                 {item.correctAnswer !== null && item.correctAnswer !== undefined ? (
                   <div>
                     <h4 className="mb-2 text-sm font-medium text-emerald-600 dark:text-emerald-400">
-                      正确答案
+                      {t("detailDialog.correctAnswer")}
                     </h4>
                     <div className="rounded-md border border-emerald-200 bg-emerald-50/50 p-3 text-sm dark:border-emerald-900 dark:bg-emerald-950/20">
                       <pre className="whitespace-pre-wrap break-words font-sans">
@@ -267,40 +198,36 @@ export function ErrorBookDetailDialog({ item, trigger, studentId, errorItems }:
               </section>
             ) : null}
 
-            {/* AI 分析区（相似题推荐 + 薄弱点分析） */}
-            {studentId && currentQuestionText ? (
+            {/* AI 分析区（由父组件注入） */}
+            {aiAnalysisSlot ? (
               <section>
-                <h4 className="mb-2 text-sm font-medium">AI 智能分析</h4>
-                <AiErrorBookAnalysis
-                  studentId={studentId}
-                  subjectId={item.subjectId ?? undefined}
-                  currentQuestionText={currentQuestionText}
-                  currentQuestionType={currentQuestionType}
-                  errorItems={aiErrorItems}
-                />
+                <h4 className="mb-2 text-sm font-medium">{t("detailDialog.aiAnalysis")}</h4>
+                {aiAnalysisSlot}
               </section>
             ) : null}
 
-            {/* 变式练习入口 */}
-            <section>
-              <Button
-                onClick={handleStartVariantPractice}
-                disabled={isPending}
-                className="w-full"
-                variant="default"
-              >
-                <Target className="h-4 w-4" />
-                {isPending ? tPractice("starter.creating") : tPractice("types.error_variant")}
-              </Button>
-              <p className="mt-1 text-xs text-muted-foreground text-center">
-                {tPractice("starter.description")}
-              </p>
-            </section>
+            {/* 变式练习入口（由父组件注入回调） */}
+            {onStartVariantPractice ? (
+              <section>
+                <Button
+                  onClick={onStartVariantPractice}
+                  disabled={isPending}
+                  className="w-full"
+                  variant="default"
+                >
+                  <Target className="h-4 w-4" />
+                  {t("detailDialog.variantPractice")}
+                </Button>
+                <p className="mt-1 text-xs text-muted-foreground text-center">
+                  {t("detailDialog.variantPracticeDesc")}
+                </p>
+              </section>
+            ) : null}
 
             {/* 复习区 */}
             {item.status !== "mastered" && item.status !== "archived" ? (
               <section>
-                <h4 className="mb-2 text-sm font-medium">复习自评</h4>
+                <h4 className="mb-2 text-sm font-medium">{t("detailDialog.reviewSelf")}</h4>
                 <ReviewButtons
                   itemId={item.id}
                   onReviewed={() => setOpen(false)}
@@ -312,17 +239,19 @@ export function ErrorBookDetailDialog({ item, trigger, studentId, errorItems }:
             <section>
               <h4 className="mb-2 flex items-center gap-1 text-sm font-medium">
                 <FileText className="h-4 w-4" />
-                学习笔记
+                {t("detailDialog.studyNote")}
               </h4>
               <textarea
                 value={note}
                 onChange={(e) => setNote(e.target.value)}
-                placeholder="记录你的反思、解题思路、易错点..."
+                placeholder={t("detailDialog.notePlaceholder")}
                 className="w-full min-h-[80px] rounded-md border bg-background p-3 text-sm resize-y focus:outline-none focus:ring-2 focus:ring-ring"
                 maxLength={2000}
               />
               <div className="mt-2">
-                <p className="mb-1 text-xs text-muted-foreground">错误原因标签</p>
+                <p className="mb-1 text-xs text-muted-foreground">
+                  {t("detailDialog.errorTagsLabel")}
+                </p>
                 <div className="flex flex-wrap gap-1">
                   {COMMON_ERROR_TAGS.map((tag) => (
                     <Badge
@@ -343,7 +272,7 @@ export function ErrorBookDetailDialog({ item, trigger, studentId, errorItems }:
                 disabled={isPending}
                 onClick={handleSaveNote}
               >
-                保存笔记
+                {t("actions.saveNote")}
               </Button>
             </section>
 
@@ -352,7 +281,7 @@ export function ErrorBookDetailDialog({ item, trigger, studentId, errorItems }:
               <section>
                 <h4 className="mb-2 flex items-center gap-1 text-sm font-medium">
                   <History className="h-4 w-4" />
-                  复习历史
+                  {t("detailDialog.reviewHistory")}
                 </h4>
                 <div className="space-y-1">
                   {item.reviews.slice(0, 10).map((r) => (
@@ -386,7 +315,7 @@ export function ErrorBookDetailDialog({ item, trigger, studentId, errorItems }:
                 onClick={handleArchive}
               >
                 <Archive className="h-4 w-4" data-icon="inline-start" />
-                归档
+                {t("actions.archive")}
               </Button>
               <Button
                 variant="ghost"
@@ -396,7 +325,7 @@ export function ErrorBookDetailDialog({ item, trigger, studentId, errorItems }:
                 className="text-destructive hover:text-destructive"
               >
                 <Trash2 className="h-4 w-4" data-icon="inline-start" />
-                删除
+                {t("actions.delete")}
               </Button>
             </div>
           </div>
diff --git a/src/modules/error-book/components/error-book-filters.tsx b/src/modules/error-book/components/error-book-filters.tsx
index 695eaaa..584bd42 100644
--- a/src/modules/error-book/components/error-book-filters.tsx
+++ b/src/modules/error-book/components/error-book-filters.tsx
@@ -1,6 +1,7 @@
 "use client"
 
 import { useQueryState, parseAsString } from "nuqs"
+import { useTranslations } from "next-intl"
 
 import {
   Select,
@@ -12,6 +13,7 @@ import {
 import { FilterBar, FilterSearchInput } from "@/shared/components/ui/filter-bar"
 
 export function ErrorBookFilters() {
+  const t = useTranslations("error-book")
   const [search, setSearch] = useQueryState("q", parseAsString.withDefault(""))
   const [status, setStatus] = useQueryState("status", parseAsString.withDefault("all"))
   const [sourceType, setSourceType] = useQueryState("source", parseAsString.withDefault("all"))
@@ -37,40 +39,40 @@ export function ErrorBookFilters() {
         <FilterSearchInput
           value={search}
           onChange={(v) => setSearch(v || null)}
-          placeholder="搜索笔记内容..."
+          placeholder={t("filters.searchPlaceholder")}
           className="flex-1 md:max-w-sm"
           inputClassName="border-muted-foreground/20 pl-8"
         />
         <Select value={status} onValueChange={(val) => setStatus(val === "all" ? null : val)}>
           <SelectTrigger className="w-[140px]">
-            <SelectValue placeholder="状态" />
+            <SelectValue placeholder={t("filters.status")} />
           </SelectTrigger>
           <SelectContent>
-            <SelectItem value="all">全部状态</SelectItem>
-            <SelectItem value="new">待学习</SelectItem>
-            <SelectItem value="learning">学习中</SelectItem>
-            <SelectItem value="mastered">已掌握</SelectItem>
-            <SelectItem value="archived">已归档</SelectItem>
+            <SelectItem value="all">{t("filters.allStatus")}</SelectItem>
+            <SelectItem value="new">{t("status.new")}</SelectItem>
+            <SelectItem value="learning">{t("status.learning")}</SelectItem>
+            <SelectItem value="mastered">{t("status.mastered")}</SelectItem>
+            <SelectItem value="archived">{t("status.archived")}</SelectItem>
           </SelectContent>
         </Select>
         <Select value={sourceType} onValueChange={(val) => setSourceType(val === "all" ? null : val)}>
           <SelectTrigger className="w-[140px]">
-            <SelectValue placeholder="来源" />
+            <SelectValue placeholder={t("filters.source")} />
           </SelectTrigger>
           <SelectContent>
-            <SelectItem value="all">全部来源</SelectItem>
-            <SelectItem value="exam">考试</SelectItem>
-            <SelectItem value="homework">作业</SelectItem>
-            <SelectItem value="manual">手动添加</SelectItem>
+            <SelectItem value="all">{t("filters.allSource")}</SelectItem>
+            <SelectItem value="exam">{t("source.exam")}</SelectItem>
+            <SelectItem value="homework">{t("source.homework")}</SelectItem>
+            <SelectItem value="manual">{t("source.manual")}</SelectItem>
           </SelectContent>
         </Select>
         <Select value={dueOnly} onValueChange={(val) => setDueOnly(val === "all" ? null : val)}>
           <SelectTrigger className="w-[140px]">
-            <SelectValue placeholder="复习" />
+            <SelectValue placeholder={t("filters.review")} />
           </SelectTrigger>
           <SelectContent>
-            <SelectItem value="all">全部错题</SelectItem>
-            <SelectItem value="due">仅看待复习</SelectItem>
+            <SelectItem value="all">{t("filters.allErrors")}</SelectItem>
+            <SelectItem value="due">{t("filters.dueOnly")}</SelectItem>
           </SelectContent>
         </Select>
       </div>
diff --git a/src/modules/error-book/components/error-book-item-card.tsx b/src/modules/error-book/components/error-book-item-card.tsx
index cf3128b..e08d370 100644
--- a/src/modules/error-book/components/error-book-item-card.tsx
+++ b/src/modules/error-book/components/error-book-item-card.tsx
@@ -1,10 +1,14 @@
+"use client"
+
 import { Calendar, FileText, BookMarked } from "lucide-react"
+import { useTranslations } from "next-intl"
 
 import { Card, CardContent, CardHeader } from "@/shared/components/ui/card"
 import { Badge } from "@/shared/components/ui/badge"
 import { StatusBadge } from "@/shared/components/ui/status-badge"
 import { cn } from "@/shared/lib/utils"
 import { formatDate } from "@/shared/lib/utils"
+import { extractQuestionPreview } from "@/shared/lib/question-content"
 
 import {
   ERROR_BOOK_SOURCE_LABEL,
@@ -19,45 +23,19 @@ interface ErrorBookItemCardProps {
   children?: React.ReactNode
 }
 
-/** 从题目内容中提取纯文本预览 */
-function extractQuestionPreview(content: unknown): string {
-  if (typeof content === "string") return content
-  if (Array.isArray(content)) {
-    const texts: string[] = []
-    for (const node of content) {
-      if (typeof node === "string") {
-        texts.push(node)
-      } else if (typeof node === "object" && node !== null) {
-        const n = node as Record<string, unknown>
-        if (typeof n.text === "string") texts.push(n.text)
-        if (Array.isArray(n.children)) {
-          texts.push(extractQuestionPreview(n.children))
-        }
-      }
-    }
-    return texts.join("")
-  }
-  if (typeof content === "object" && content !== null) {
-    const c = content as Record<string, unknown>
-    if (typeof c.text === "string") return c.text
-  }
-  return "（题目内容）"
-}
-
-const MASTERY_LEVEL_LABELS: Record<number, string> = {
-  0: "未学习",
-  1: "入门",
-  2: "了解",
-  3: "熟悉",
-  4: "熟练",
-  5: "掌握",
-}
-
 export function ErrorBookItemCard({ item, children }: ErrorBookItemCardProps) {
-  const preview = item.question ? extractQuestionPreview(item.question.content) : "（题目已删除）"
+  const t = useTranslations("error-book")
+  const preview = item.question
+    ? extractQuestionPreview(item.question.content, t("itemCard.questionContent"))
+    : t("itemCard.questionDeleted")
   const isDue = item.nextReviewAt ? item.nextReviewAt <= new Date() : false
   const isMastered = item.status === "mastered"
 
+  const masteryLabel =
+    item.masteryLevel >= 0 && item.masteryLevel <= 5
+      ? t(`masteryLevel.${item.masteryLevel}`)
+      : String(item.masteryLevel)
+
   return (
     <Card
       className={cn(
@@ -87,7 +65,7 @@ export function ErrorBookItemCard({ item, children }: ErrorBookItemCardProps) {
           ) : null}
           {item.question?.difficulty ? (
             <Badge variant="secondary">
-              难度 {item.question.difficulty}
+              {t("itemCard.difficulty", { level: item.question.difficulty })}
             </Badge>
           ) : null}
         </div>
@@ -120,11 +98,13 @@ export function ErrorBookItemCard({ item, children }: ErrorBookItemCardProps) {
 
         <div className="flex items-center justify-between">
           <div className="flex items-center gap-3 text-xs text-muted-foreground">
-            <span>掌握度: {MASTERY_LEVEL_LABELS[item.masteryLevel] ?? item.masteryLevel}</span>
-            <span>复习 {item.reviewCount} 次</span>
+            <span>{t("itemCard.mastery", { level: masteryLabel })}</span>
+            <span>{t("itemCard.reviewTimes", { count: item.reviewCount })}</span>
             {item.nextReviewAt && !isMastered ? (
               <span className={cn(isDue && "font-medium text-rose-600 dark:text-rose-400")}>
-                {isDue ? "需复习" : `下次 ${formatDate(item.nextReviewAt)}`}
+                {isDue
+                  ? t("itemCard.needReview")
+                  : t("itemCard.nextReview", { date: formatDate(item.nextReviewAt) })}
               </span>
             ) : null}
           </div>
diff --git a/src/modules/error-book/components/error-book-list.tsx b/src/modules/error-book/components/error-book-list.tsx
index ddb7748..5286792 100644
--- a/src/modules/error-book/components/error-book-list.tsx
+++ b/src/modules/error-book/components/error-book-list.tsx
@@ -1,4 +1,8 @@
+"use client"
+
+import type { JSX } from "react"
 import { BookX } from "lucide-react"
+import { useTranslations } from "next-intl"
 
 import { EmptyState } from "@/shared/components/ui/empty-state"
 import { Button } from "@/shared/components/ui/button"
@@ -8,19 +12,25 @@ import type { ErrorBookItem } from "../types"
 
 interface ErrorBookListProps {
   items: ErrorBookItem[]
-  /** 当前学生 ID（用于 AI 薄弱点分析） */
-  studentId?: string
-  /** 全部错题列表（用于 AI 薄弱点分析，不传则禁用 AI 分析） */
-  errorItems?: ErrorBookItem[]
+  /** AI 分析区域插槽（由父组件注入，传递给每个 ErrorBookDetailDialog） */
+  aiAnalysisSlot?: (item: ErrorBookItem) => React.ReactNode
+  /** 发起变式练习回调（由父组件注入） */
+  onStartVariantPractice?: (item: ErrorBookItem) => void
 }
 
-export function ErrorBookList({ items, studentId, errorItems }: ErrorBookListProps) {
+export function ErrorBookList({
+  items,
+  aiAnalysisSlot,
+  onStartVariantPractice,
+}: ErrorBookListProps): JSX.Element {
+  const t = useTranslations("error-book")
+
   if (items.length === 0) {
     return (
       <EmptyState
         icon={BookX}
-        title="错题本为空"
-        description="完成考试或作业后，错题会自动收录到这里。你也可以手动添加错题。"
+        title={t("empty.title")}
+        description={t("empty.description")}
         className="h-[360px] bg-card"
       />
     )
@@ -32,11 +42,11 @@ export function ErrorBookList({ items, studentId, errorItems }: ErrorBookListPro
         <ErrorBookItemCard key={item.id} item={item}>
           <ErrorBookDetailDialog
             item={item}
-            studentId={studentId}
-            errorItems={errorItems}
+            aiAnalysisSlot={aiAnalysisSlot?.(item)}
+            onStartVariantPractice={onStartVariantPractice ? () => onStartVariantPractice(item) : undefined}
             trigger={
               <Button variant="outline" size="sm">
-                查看详情
+                {t("actions.viewDetail")}
               </Button>
             }
           />
diff --git a/src/modules/error-book/components/error-book-stats-cards.tsx b/src/modules/error-book/components/error-book-stats-cards.tsx
index 4b055b6..5c9645c 100644
--- a/src/modules/error-book/components/error-book-stats-cards.tsx
+++ b/src/modules/error-book/components/error-book-stats-cards.tsx
@@ -1,4 +1,7 @@
+"use client"
+
 import { BookX, Clock, GraduationCap, Repeat, Sparkles } from "lucide-react"
+import { useTranslations } from "next-intl"
 
 import { StatCard } from "@/shared/components/ui/stat-card"
 import type { ErrorBookStats } from "../types"
@@ -9,6 +12,7 @@ interface ErrorBookStatsCardsProps {
 }
 
 export function ErrorBookStatsCards({ stats, isLoading }: ErrorBookStatsCardsProps) {
+  const t = useTranslations("error-book")
   const masteredPercent = stats.totalCount > 0
     ? Math.round(stats.masteredRate * 100)
     : 0
@@ -16,42 +20,42 @@ export function ErrorBookStatsCards({ stats, isLoading }: ErrorBookStatsCardsPro
   return (
     <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-5">
       <StatCard
-        title="错题总数"
+        title={t("stats.total")}
         value={stats.totalCount}
         icon={BookX}
-        description="累计收录的错题"
+        description={t("stats.totalDesc")}
         isLoading={isLoading}
       />
       <StatCard
-        title="待学习"
+        title={t("stats.new")}
         value={stats.newCount}
         icon={Sparkles}
         color="text-blue-500"
-        description="尚未开始复习"
+        description={t("stats.newDesc")}
         isLoading={isLoading}
       />
       <StatCard
-        title="学习中"
+        title={t("stats.learning")}
         value={stats.learningCount}
         icon={Repeat}
         color="text-amber-500"
-        description="正在复习掌握"
+        description={t("stats.learningDesc")}
         isLoading={isLoading}
       />
       <StatCard
-        title="已掌握"
+        title={t("stats.mastered")}
         value={stats.masteredCount}
         icon={GraduationCap}
         color="text-emerald-500"
-        description={`掌握率 ${masteredPercent}%`}
+        description={t("stats.masteredDesc", { rate: masteredPercent })}
         isLoading={isLoading}
       />
       <StatCard
-        title="待复习"
+        title={t("stats.dueReview")}
         value={stats.dueReviewCount}
         icon={Clock}
         color="text-rose-500"
-        description="今日到期复习"
+        description={t("stats.dueReviewDesc")}
         highlight={stats.dueReviewCount > 0}
         isLoading={isLoading}
       />
diff --git a/src/modules/error-book/components/grouped-student-error-table.tsx b/src/modules/error-book/components/grouped-student-error-table.tsx
index 537e66b..ef928d2 100644
--- a/src/modules/error-book/components/grouped-student-error-table.tsx
+++ b/src/modules/error-book/components/grouped-student-error-table.tsx
@@ -1,7 +1,9 @@
 "use client"
 
 import { useState } from "react"
+import Link from "next/link"
 import { ChevronDown, ChevronRight, Users } from "lucide-react"
+import { useTranslations } from "next-intl"
 
 import { Badge } from "@/shared/components/ui/badge"
 import { Progress } from "@/shared/components/ui/progress"
@@ -32,6 +34,7 @@ export function GroupedStudentErrorTable({
   studentNames,
   basePath,
 }: GroupedStudentErrorTableProps) {
+  const t = useTranslations("error-book")
   const [expandedClasses, setExpandedClasses] = useState<Set<string>>(new Set())
 
   // 按班级分组
@@ -44,7 +47,7 @@ export function GroupedStudentErrorTable({
     if (!group) {
       group = {
         classId: key,
-        className: student.className ?? "未分班",
+        className: student.className ?? t("groupedTable.unclassified"),
         students: [],
         totalErrors: 0,
         averageMasteryRate: 0,
@@ -95,6 +98,7 @@ export function GroupedStudentErrorTable({
             {/* 班级头部（可点击展开） */}
             <button
               type="button"
+              aria-expanded={isExpanded}
               onClick={() => toggleClass(group.classId)}
               className="flex w-full items-center justify-between gap-3 bg-muted/50 p-3 text-left transition-colors hover:bg-muted"
             >
@@ -107,21 +111,21 @@ export function GroupedStudentErrorTable({
                 <Users className="h-4 w-4 text-muted-foreground" />
                 <span className="font-medium">{group.className}</span>
                 <Badge variant="outline" className="text-xs">
-                  {group.students.length} 人
+                  {t("groupedTable.studentCount", { count: group.students.length })}
                 </Badge>
                 {studentsWithErrors.length < group.students.length ? (
                   <Badge variant="secondary" className="text-xs">
-                    {studentsWithErrors.length} 人有错题
+                    {t("groupedTable.studentsWithErrors", { count: studentsWithErrors.length })}
                   </Badge>
                 ) : null}
               </div>
               <div className="flex items-center gap-4 text-sm">
                 <div className="text-right">
-                  <div className="text-xs text-muted-foreground">错题总数</div>
+                  <div className="text-xs text-muted-foreground">{t("groupedTable.totalErrors")}</div>
                   <div className="font-bold text-rose-600">{group.totalErrors}</div>
                 </div>
                 <div className="text-right">
-                  <div className="text-xs text-muted-foreground">平均掌握率</div>
+                  <div className="text-xs text-muted-foreground">{t("groupedTable.avgMastery")}</div>
                   <div className="font-medium">
                     {Math.round(group.averageMasteryRate * 100)}%
                   </div>
@@ -135,18 +139,18 @@ export function GroupedStudentErrorTable({
                 <table className="w-full text-sm">
                   <thead className="border-b bg-muted/30">
                     <tr className="text-left text-xs text-muted-foreground">
-                      <th className="px-3 py-2 font-medium">学生</th>
-                      <th className="px-3 py-2 text-right font-medium">错题总数</th>
-                      <th className="px-3 py-2 text-right font-medium">待学习</th>
-                      <th className="px-3 py-2 text-right font-medium">学习中</th>
-                      <th className="px-3 py-2 text-right font-medium">已掌握</th>
-                      <th className="px-3 py-2 text-right font-medium">待复习</th>
-                      <th className="px-3 py-2 font-medium">掌握率</th>
+                      <th className="px-3 py-2 font-medium">{t("groupedTable.student")}</th>
+                      <th className="px-3 py-2 text-right font-medium">{t("groupedTable.totalErrors")}</th>
+                      <th className="px-3 py-2 text-right font-medium">{t("groupedTable.new")}</th>
+                      <th className="px-3 py-2 text-right font-medium">{t("groupedTable.learning")}</th>
+                      <th className="px-3 py-2 text-right font-medium">{t("groupedTable.mastered")}</th>
+                      <th className="px-3 py-2 text-right font-medium">{t("groupedTable.dueReview")}</th>
+                      <th className="px-3 py-2 font-medium">{t("groupedTable.masteryRate")}</th>
                     </tr>
                   </thead>
                   <tbody>
                     {group.students.map((student) => {
-                      const name = studentNames.get(student.studentId) ?? "未知"
+                      const name = studentNames.get(student.studentId) ?? t("groupedTable.unknown")
                       const hasErrors = student.totalCount > 0
                       return (
                         <tr
@@ -158,12 +162,12 @@ export function GroupedStudentErrorTable({
                         >
                           <td className="px-3 py-2">
                             {hasErrors ? (
-                              <a
+                              <Link
                                 href={`${basePath}?studentId=${student.studentId}`}
                                 className="font-medium text-primary hover:underline"
                               >
                                 {name}
-                              </a>
+                              </Link>
                             ) : (
                               <span className="text-muted-foreground">{name}</span>
                             )}
diff --git a/src/modules/error-book/components/knowledge-point-weakness-chart.tsx b/src/modules/error-book/components/knowledge-point-weakness-chart.tsx
index cd396ef..d8be038 100644
--- a/src/modules/error-book/components/knowledge-point-weakness-chart.tsx
+++ b/src/modules/error-book/components/knowledge-point-weakness-chart.tsx
@@ -1,6 +1,7 @@
 "use client"
 
 import { Bar, BarChart, CartesianGrid, XAxis, YAxis, Cell } from "recharts"
+import { useTranslations } from "next-intl"
 import {
   ChartContainer,
   ChartTooltip,
@@ -18,6 +19,27 @@ interface KnowledgePointWeaknessChartProps {
   className?: string
 }
 
+interface KpChartPayload {
+  name: string
+  errorCount: number
+  masteredCount: number
+  masteryRate: number
+  chapterTitle: string
+}
+
+function isKpChartPayload(v: unknown): v is KpChartPayload {
+  if (typeof v !== "object" || v === null) return false
+  // 从 unknown 转换：类型守卫内需要属性访问来校验字段类型
+  const obj = v as Record<string, unknown>
+  return (
+    typeof obj.name === "string" &&
+    typeof obj.errorCount === "number" &&
+    typeof obj.masteredCount === "number" &&
+    typeof obj.masteryRate === "number" &&
+    typeof obj.chapterTitle === "string"
+  )
+}
+
 /**
  * 知识点薄弱度图表
  * 横向柱状图，按错题数降序
@@ -28,6 +50,8 @@ export function KnowledgePointWeaknessChart({
   data,
   className,
 }: KnowledgePointWeaknessChartProps) {
+  const t = useTranslations("error-book")
+
   if (data.length === 0) return null
 
   const chartData = data.map((d) => ({
@@ -35,12 +59,12 @@ export function KnowledgePointWeaknessChart({
     errorCount: d.errorCount,
     masteredCount: d.masteredCount,
     masteryRate: Number((d.masteryRate * 100).toFixed(0)),
-    chapterTitle: d.chapterTitle ?? "未分类",
+    chapterTitle: d.chapterTitle ?? t("weaknessChart.unclassified"),
   }))
 
   const chartConfig: ChartConfig = {
     errorCount: {
-      label: "错题数",
+      label: t("weaknessChart.errorCount"),
       color: "var(--color-chart-1)",
     },
   }
@@ -48,10 +72,16 @@ export function KnowledgePointWeaknessChart({
   return (
     <Card className={cn("overflow-hidden", className)}>
       <CardHeader>
-        <CardTitle className="text-base">薄弱知识点 Top {data.length}</CardTitle>
+        <CardTitle className="text-base">
+          {t("weaknessChart.title", { count: data.length })}
+        </CardTitle>
       </CardHeader>
       <CardContent className="space-y-4">
-        <ChartContainer config={chartConfig} className="h-[320px] w-full">
+        <ChartContainer
+          config={chartConfig}
+          className="h-[320px] w-full"
+          aria-label={t("weaknessChart.title", { count: data.length })}
+        >
           <BarChart
             data={chartData}
             layout="vertical"
@@ -74,25 +104,24 @@ export function KnowledgePointWeaknessChart({
                 <ChartTooltipContent
                   className="w-[240px]"
                   formatter={(payload: unknown) => {
-                    const p = payload as unknown as {
-                      name: string
-                      errorCount: number
-                      masteredCount: number
-                      masteryRate: number
-                      chapterTitle: string
-                    }
+                    if (!isKpChartPayload(payload)) return null
                     return (
                       <div className="space-y-1.5">
-                        <div className="font-medium">{p.name}</div>
+                        <div className="font-medium">{payload.name}</div>
                         <div className="text-xs text-muted-foreground">
-                          所属章节：{p.chapterTitle}
+                          {t("weaknessChart.chapterLabel", { title: payload.chapterTitle })}
                         </div>
                         <div className="text-muted-foreground">
-                          错题数：<span className="font-medium text-foreground">{p.errorCount}</span>
-                          <span className="ml-2">已掌握：<span className="font-medium text-emerald-600">{p.masteredCount}</span></span>
+                          {t("weaknessChart.errorCount")}：
+                          <span className="font-medium text-foreground">{payload.errorCount}</span>
+                          <span className="ml-2">
+                            {t("weaknessChart.masteredLabel")}：
+                            <span className="font-medium text-emerald-600">{payload.masteredCount}</span>
+                          </span>
                         </div>
                         <div className="text-muted-foreground">
-                          掌握率：<span className="font-medium text-foreground">{p.masteryRate}%</span>
+                          {t("weaknessChart.masteryRateLabel")}：
+                          <span className="font-medium text-foreground">{payload.masteryRate}%</span>
                         </div>
                       </div>
                     )
diff --git a/src/modules/error-book/components/review-buttons.tsx b/src/modules/error-book/components/review-buttons.tsx
index d2cff28..8c666ba 100644
--- a/src/modules/error-book/components/review-buttons.tsx
+++ b/src/modules/error-book/components/review-buttons.tsx
@@ -3,6 +3,7 @@
 import { useState, useTransition } from "react"
 import { RotateCcw, ThumbsUp, Check, Zap } from "lucide-react"
 import { toast } from "sonner"
+import { useTranslations } from "next-intl"
 
 import { Button } from "@/shared/components/ui/button"
 import { reviewErrorBookItemAction } from "../actions"
@@ -13,47 +14,50 @@ interface ReviewButtonsProps {
   onReviewed?: () => void
 }
 
-const REVIEW_OPTIONS: Array<{
+type ReviewOption = {
   result: ErrorBookReviewResultValue
   label: string
   description: string
   icon: typeof RotateCcw
   variant: "destructive" | "secondary" | "default" | "outline"
-}> = [
-  {
-    result: "again",
-    label: "重来",
-    description: "完全不会，明天再复习",
-    icon: RotateCcw,
-    variant: "destructive",
-  },
-  {
-    result: "hard",
-    label: "困难",
-    description: "勉强答对，2 天后复习",
-    icon: Zap,
-    variant: "secondary",
-  },
-  {
-    result: "good",
-    label: "良好",
-    description: "正常答对，4 天后复习",
-    icon: ThumbsUp,
-    variant: "default",
-  },
-  {
-    result: "easy",
-    label: "简单",
-    description: "轻松答对，7 天后复习",
-    icon: Check,
-    variant: "outline",
-  },
-]
+}
 
 export function ReviewButtons({ itemId, onReviewed }: ReviewButtonsProps) {
+  const t = useTranslations("error-book")
   const [isPending, startTransition] = useTransition()
   const [selected, setSelected] = useState<ErrorBookReviewResultValue | null>(null)
 
+  const reviewOptions: ReviewOption[] = [
+    {
+      result: "again",
+      label: t("review.again"),
+      description: t("review.againDesc"),
+      icon: RotateCcw,
+      variant: "destructive",
+    },
+    {
+      result: "hard",
+      label: t("review.hard"),
+      description: t("review.hardDesc"),
+      icon: Zap,
+      variant: "secondary",
+    },
+    {
+      result: "good",
+      label: t("review.good"),
+      description: t("review.goodDesc"),
+      icon: ThumbsUp,
+      variant: "default",
+    },
+    {
+      result: "easy",
+      label: t("review.easy"),
+      description: t("review.easyDesc"),
+      icon: Check,
+      variant: "outline",
+    },
+  ]
+
   function handleReview(result: ErrorBookReviewResultValue) {
     setSelected(result)
     startTransition(async () => {
@@ -61,10 +65,10 @@ export function ReviewButtons({ itemId, onReviewed }: ReviewButtonsProps) {
       formData.append("json", JSON.stringify({ itemId, result }))
       const res = await reviewErrorBookItemAction(undefined, formData)
       if (res.success) {
-        toast.success(res.message ?? "复习结果已记录")
+        toast.success(res.message ?? t("messages.reviewRecorded"))
         onReviewed?.()
       } else {
-        toast.error(res.message ?? "记录失败")
+        toast.error(res.message ?? t("messages.recordFailed"))
         setSelected(null)
       }
     })
@@ -72,7 +76,7 @@ export function ReviewButtons({ itemId, onReviewed }: ReviewButtonsProps) {
 
   return (
     <div className="grid grid-cols-2 gap-2 sm:grid-cols-4">
-      {REVIEW_OPTIONS.map((opt) => {
+      {reviewOptions.map((opt) => {
         const Icon = opt.icon
         const isLoading = isPending && selected === opt.result
         return (
diff --git a/src/modules/error-book/components/subject-distribution-chart.tsx b/src/modules/error-book/components/subject-distribution-chart.tsx
index a316c3f..6d3afaf 100644
--- a/src/modules/error-book/components/subject-distribution-chart.tsx
+++ b/src/modules/error-book/components/subject-distribution-chart.tsx
@@ -1,6 +1,7 @@
 "use client"
 
 import { Bar, BarChart, CartesianGrid, XAxis, YAxis, Cell } from "recharts"
+import { useTranslations } from "next-intl"
 import {
   ChartContainer,
   ChartTooltip,
@@ -17,6 +18,25 @@ interface SubjectDistributionChartProps {
   className?: string
 }
 
+interface SubjectDistChartPayload {
+  name: string
+  errorCount: number
+  masteredCount: number
+  masteryRate: number
+}
+
+function isSubjectDistChartPayload(v: unknown): v is SubjectDistChartPayload {
+  if (typeof v !== "object" || v === null) return false
+  // 从 unknown 转换：类型守卫内需要属性访问来校验字段类型
+  const obj = v as Record<string, unknown>
+  return (
+    typeof obj.name === "string" &&
+    typeof obj.errorCount === "number" &&
+    typeof obj.masteredCount === "number" &&
+    typeof obj.masteryRate === "number"
+  )
+}
+
 const SUBJECT_COLORS = [
   "var(--color-chart-1)",
   "var(--color-chart-2)",
@@ -34,6 +54,8 @@ export function SubjectDistributionChart({
   data,
   className,
 }: SubjectDistributionChartProps) {
+  const t = useTranslations("error-book")
+
   if (data.length === 0) return null
 
   const chartData = data.map((d) => ({
@@ -45,7 +67,7 @@ export function SubjectDistributionChart({
 
   const chartConfig: ChartConfig = {
     errorCount: {
-      label: "错题数",
+      label: t("subjectDistChart.errorCount"),
       color: "var(--color-chart-1)",
     },
   }
@@ -53,10 +75,14 @@ export function SubjectDistributionChart({
   return (
     <Card className={cn("overflow-hidden", className)}>
       <CardHeader>
-        <CardTitle className="text-base">各学科错题分布</CardTitle>
+        <CardTitle className="text-base">{t("subjectDistChart.title")}</CardTitle>
       </CardHeader>
       <CardContent>
-        <ChartContainer config={chartConfig} className="h-[280px] w-full">
+        <ChartContainer
+          config={chartConfig}
+          className="h-[280px] w-full"
+          aria-label={t("subjectDistChart.title")}
+        >
           <BarChart data={chartData} margin={{ left: 8, right: 8, top: 8, bottom: 8 }}>
             <CartesianGrid vertical={false} strokeDasharray="4 4" strokeOpacity={0.4} />
             <XAxis
@@ -74,23 +100,21 @@ export function SubjectDistributionChart({
                 <ChartTooltipContent
                   className="w-[200px]"
                   formatter={(payload: unknown) => {
-                    const p = payload as unknown as {
-                      name: string
-                      errorCount: number
-                      masteredCount: number
-                      masteryRate: number
-                    }
+                    if (!isSubjectDistChartPayload(payload)) return null
                     return (
                       <div className="space-y-1.5">
-                        <div className="font-medium">{p.name}</div>
+                        <div className="font-medium">{payload.name}</div>
                         <div className="text-muted-foreground">
-                          错题数：<span className="font-medium text-foreground">{p.errorCount}</span>
+                          {t("subjectDistChart.errorCount")}：
+                          <span className="font-medium text-foreground">{payload.errorCount}</span>
                         </div>
                         <div className="text-muted-foreground">
-                          已掌握：<span className="font-medium text-emerald-600">{p.masteredCount}</span>
+                          {t("subjectDistChart.masteredLabel")}：
+                          <span className="font-medium text-emerald-600">{payload.masteredCount}</span>
                         </div>
                         <div className="text-muted-foreground">
-                          掌握率：<span className="font-medium text-foreground">{p.masteryRate}%</span>
+                          {t("subjectDistChart.masteryRateLabel")}：
+                          <span className="font-medium text-foreground">{payload.masteryRate}%</span>
                         </div>
                       </div>
                     )
diff --git a/src/modules/error-book/components/subject-tabs.tsx b/src/modules/error-book/components/subject-tabs.tsx
index c686736..cb2c4b2 100644
--- a/src/modules/error-book/components/subject-tabs.tsx
+++ b/src/modules/error-book/components/subject-tabs.tsx
@@ -1,6 +1,7 @@
 "use client"
 
 import { useRouter, useSearchParams } from "next/navigation"
+import { useTranslations } from "next-intl"
 import { cn } from "@/shared/lib/utils"
 import { Badge } from "@/shared/components/ui/badge"
 
@@ -25,6 +26,7 @@ export function SubjectTabs({
 }: SubjectTabsProps) {
   const router = useRouter()
   const searchParams = useSearchParams()
+  const t = useTranslations("error-book")
 
   const handleSelect = (subjectId: string | null) => {
     const params = new URLSearchParams(searchParams.toString())
@@ -44,6 +46,8 @@ export function SubjectTabs({
     <div className="flex flex-wrap gap-2">
       <button
         type="button"
+        role="tab"
+        aria-selected={currentSubjectId === null}
         onClick={() => handleSelect(null)}
         className={cn(
           "inline-flex items-center gap-2 rounded-full border px-3 py-1.5 text-sm transition-colors",
@@ -52,7 +56,7 @@ export function SubjectTabs({
             : "bg-card hover:bg-muted"
         )}
       >
-        <span className="font-medium">全部学科</span>
+        <span className="font-medium">{t("subjectTabs.all")}</span>
         <Badge
           variant={currentSubjectId === null ? "secondary" : "outline"}
           className="text-xs"
@@ -66,6 +70,8 @@ export function SubjectTabs({
           <button
             key={subject.subjectId}
             type="button"
+            role="tab"
+            aria-selected={isActive}
             onClick={() => handleSelect(subject.subjectId)}
             className={cn(
               "inline-flex items-center gap-2 rounded-full border px-3 py-1.5 text-sm transition-colors",
@@ -88,7 +94,7 @@ export function SubjectTabs({
                   isActive ? "text-primary-foreground/80" : "text-rose-600"
                 )}
               >
-                待复习 {subject.dueReviewCount}
+                {t("subjectTabs.dueReview", { count: subject.dueReviewCount })}
               </span>
             ) : null}
           </button>
diff --git a/src/modules/error-book/components/top-wrong-questions.tsx b/src/modules/error-book/components/top-wrong-questions.tsx
index f910245..652f1a3 100644
--- a/src/modules/error-book/components/top-wrong-questions.tsx
+++ b/src/modules/error-book/components/top-wrong-questions.tsx
@@ -1,8 +1,12 @@
+"use client"
+
 import { Flame } from "lucide-react"
+import { useTranslations } from "next-intl"
 
 import { Card, CardContent, CardHeader, CardTitle } from "@/shared/components/ui/card"
 import { Badge } from "@/shared/components/ui/badge"
 import { EmptyState } from "@/shared/components/ui/empty-state"
+import { extractQuestionPreview } from "@/shared/lib/question-content"
 
 interface TopWrongQuestion {
   questionId: string
@@ -16,45 +20,36 @@ interface TopWrongQuestionsProps {
   questions: TopWrongQuestion[]
 }
 
-function extractPreview(content: unknown): string {
-  if (typeof content === "string") return content.slice(0, 120)
-  if (Array.isArray(content)) {
-    const texts: string[] = []
-    for (const node of content) {
-      if (typeof node === "string") texts.push(node)
-      else if (typeof node === "object" && node !== null) {
-        const n = node as Record<string, unknown>
-        if (typeof n.text === "string") texts.push(n.text)
-      }
-    }
-    return texts.join("").slice(0, 120)
-  }
-  return "题目内容"
-}
+const KNOWN_QUESTION_TYPES = [
+  "single_choice",
+  "multiple_choice",
+  "judgment",
+  "text",
+  "composite",
+] as const
+type KnownQuestionType = (typeof KNOWN_QUESTION_TYPES)[number]
 
-const QUESTION_TYPE_LABEL: Record<string, string> = {
-  single_choice: "单选",
-  multiple_choice: "多选",
-  judgment: "判断",
-  text: "简答",
-  composite: "复合",
+function isKnownQuestionType(v: string): v is KnownQuestionType {
+  return (KNOWN_QUESTION_TYPES as readonly string[]).includes(v)
 }
 
 export function TopWrongQuestions({ questions }: TopWrongQuestionsProps) {
+  const t = useTranslations("error-book")
+
   if (questions.length === 0) {
     return (
       <Card>
         <CardHeader>
           <CardTitle className="flex items-center gap-2 text-base">
             <Flame className="h-4 w-4" />
-            高频错题
+            {t("topWrong.title")}
           </CardTitle>
         </CardHeader>
         <CardContent>
           <EmptyState
             icon={Flame}
-            title="暂无高频错题"
-            description="学生完成作业或考试后，错频统计会显示在这里。"
+            title={t("topWrong.emptyTitle")}
+            description={t("topWrong.emptyDesc")}
             className="h-[200px]"
           />
         </CardContent>
@@ -67,7 +62,7 @@ export function TopWrongQuestions({ questions }: TopWrongQuestionsProps) {
       <CardHeader>
         <CardTitle className="flex items-center gap-2 text-base">
           <Flame className="h-4 w-4" />
-          高频错题 Top 10
+          {t("topWrong.topTitle")}
         </CardTitle>
       </CardHeader>
       <CardContent>
@@ -84,19 +79,21 @@ export function TopWrongQuestions({ questions }: TopWrongQuestionsProps) {
                 </Badge>
                 <div className="flex-1 min-w-0 space-y-1">
                   <p className="text-sm line-clamp-2">
-                    {extractPreview(q.questionContent)}
+                    {extractQuestionPreview(q.questionContent, t("itemCard.questionContent"), 120)}
                   </p>
                   <div className="flex items-center gap-2 text-xs text-muted-foreground">
                     <Badge variant="secondary" className="text-xs">
-                      {QUESTION_TYPE_LABEL[q.questionType] ?? q.questionType}
+                      {isKnownQuestionType(q.questionType)
+                        ? t(`questionType.${q.questionType}`)
+                        : q.questionType}
                     </Badge>
-                    <span>{q.errorCount} 人错</span>
+                    <span>{t("topWrong.errorCount", { count: q.errorCount })}</span>
                     <span>·</span>
                     <span className="text-emerald-600 dark:text-emerald-400">
-                      {q.masteredCount} 人已掌握
+                      {t("topWrong.masteredCount", { count: q.masteredCount })}
                     </span>
                     <span>·</span>
-                    <span>掌握率 {Math.round(masteryRate * 100)}%</span>
+                    <span>{t("topWrong.masteryRate", { rate: Math.round(masteryRate * 100) })}</span>
                   </div>
                 </div>
               </div>
diff --git a/src/modules/error-book/data-access-analytics.ts b/src/modules/error-book/data-access-analytics.ts
new file mode 100644
index 0000000..05b2747
--- /dev/null
+++ b/src/modules/error-book/data-access-analytics.ts
@@ -0,0 +1,552 @@
+import "server-only"
+
+import { count, desc, eq, inArray, sql } from "drizzle-orm"
+
+import { db } from "@/shared/db"
+import {
+  errorBookItems,
+  questions,
+  knowledgePoints,
+  chapters,
+  subjects,
+  users,
+  classEnrollments,
+  classes,
+} from "@/shared/db/schema"
+import { getStudentIdsByClassIds } from "@/modules/classes/data-access"
+import { ROLE_NAMES } from "@/shared/types/permissions"
+
+import type {
+  ChapterWeakness,
+  ClassErrorOverview,
+  KnowledgePointWeakness,
+  StudentErrorBookSummary,
+  SubjectErrorOverview,
+} from "./types"
+import { buildStudentErrorWhereClause, toStatus, toStringArray } from "./data-access"
+
+// ---------------------------------------------------------------------------
+// 教师/管理员分析查询（SQL 聚合优化）
+// ---------------------------------------------------------------------------
+
+/** 查询多个学生的错题统计（教师视图，支持按学科过滤） */
+export async function getStudentErrorBookSummaries(
+  studentIds: string[],
+  subjectId?: string | null
+): Promise<StudentErrorBookSummary[]> {
+  if (studentIds.length === 0) return []
+
+  const now = new Date()
+  const whereClause = buildStudentErrorWhereClause(studentIds, subjectId)
+
+  // 使用 SQL 条件聚合（GROUP BY studentId）
+  const rows = await db
+    .select({
+      studentId: errorBookItems.studentId,
+      totalCount: count(),
+      newCount: sql<number>`sum(case when ${errorBookItems.status} = 'new' then 1 else 0 end)`,
+      learningCount: sql<number>`sum(case when ${errorBookItems.status} = 'learning' then 1 else 0 end)`,
+      masteredCount: sql<number>`sum(case when ${errorBookItems.status} = 'mastered' then 1 else 0 end)`,
+      dueReviewCount: sql<number>`sum(case when ${errorBookItems.status} not in ('mastered', 'archived') and (${errorBookItems.nextReviewAt} is null or ${errorBookItems.nextReviewAt} <= ${now}) then 1 else 0 end)`,
+      lastActivityAt: sql<Date | null>`max(${errorBookItems.updatedAt})`,
+    })
+    .from(errorBookItems)
+    .where(whereClause)
+    .groupBy(errorBookItems.studentId)
+
+  // 查询学生所属班级（用于按班级分组展示）
+  const enrollmentRows = await db
+    .select({
+      studentId: classEnrollments.studentId,
+      classId: classes.id,
+      className: classes.name,
+    })
+    .from(classEnrollments)
+    .innerJoin(classes, eq(classEnrollments.classId, classes.id))
+    .where(inArray(classEnrollments.studentId, studentIds))
+
+  const studentClassMap = new Map<string, { classId: string; className: string }>()
+  for (const row of enrollmentRows) {
+    // 取第一个班级（学生通常只属于一个班）
+    if (!studentClassMap.has(row.studentId)) {
+      studentClassMap.set(row.studentId, { classId: row.classId, className: row.className })
+    }
+  }
+
+  return rows.map((row) => {
+    const totalCount = Number(row.totalCount)
+    const masteredCount = Number(row.masteredCount)
+    const classInfo = studentClassMap.get(row.studentId)
+    return {
+      studentId: row.studentId,
+      totalCount,
+      newCount: Number(row.newCount),
+      learningCount: Number(row.learningCount),
+      masteredCount,
+      dueReviewCount: Number(row.dueReviewCount),
+      masteredRate: totalCount > 0 ? masteredCount / totalCount : 0,
+      lastActivityAt: row.lastActivityAt,
+      classId: classInfo?.classId ?? null,
+      className: classInfo?.className ?? null,
+    }
+  })
+}
+
+/** 查询班级内错题最多的题目（教师视图：高频错题，支持按学科过滤） */
+export async function getTopWrongQuestionsByStudentIds(
+  studentIds: string[],
+  limit = 10,
+  subjectId?: string | null
+): Promise<Array<{
+  questionId: string
+  questionContent: unknown
+  questionType: string
+  errorCount: number
+  masteredCount: number
+}>> {
+  if (studentIds.length === 0) return []
+
+  const whereClause = buildStudentErrorWhereClause(studentIds, subjectId)
+
+  // 使用子查询聚合，避免 GROUP BY JSON 列的问题
+  const aggregatedSubquery = db
+    .select({
+      questionId: errorBookItems.questionId,
+      errorCount: count(),
+      masteredCount: sql<number>`sum(case when ${errorBookItems.status} = 'mastered' then 1 else 0 end)`,
+    })
+    .from(errorBookItems)
+    .where(whereClause)
+    .groupBy(errorBookItems.questionId)
+    .as("aggregated")
+
+  const rows = await db
+    .select({
+      questionId: aggregatedSubquery.questionId,
+      errorCount: aggregatedSubquery.errorCount,
+      masteredCount: aggregatedSubquery.masteredCount,
+      content: questions.content,
+      type: questions.type,
+    })
+    .from(aggregatedSubquery)
+    .innerJoin(questions, eq(questions.id, aggregatedSubquery.questionId))
+    .orderBy(desc(aggregatedSubquery.errorCount))
+    .limit(limit)
+
+  return rows.map((row) => ({
+    questionId: row.questionId,
+    questionContent: row.content,
+    questionType: row.type,
+    errorCount: Number(row.errorCount),
+    masteredCount: Number(row.masteredCount),
+  }))
+}
+
+/** 查询多个学生的知识点薄弱度统计（支持按学科过滤，关联章节信息） */
+export async function getKnowledgePointWeakness(
+  studentIds: string[],
+  limit = 10,
+  subjectId?: string | null
+): Promise<KnowledgePointWeakness[]> {
+  if (studentIds.length === 0) return []
+
+  const whereClause = buildStudentErrorWhereClause(studentIds, subjectId)
+
+  // knowledgePointIds 是 JSON 数组字段，无法直接用 SQL GROUP BY，保留 JS 聚合
+  // 仅查询必要字段（不查询全行）
+  const rows = await db
+    .select({
+      status: errorBookItems.status,
+      knowledgePointIds: errorBookItems.knowledgePointIds,
+    })
+    .from(errorBookItems)
+    .where(whereClause)
+
+  // 展开知识点并统计（使用类型守卫替代 as 断言）
+  const kpMap = new Map<string, { errorCount: number; masteredCount: number }>()
+
+  for (const row of rows) {
+    const kps = toStringArray(row.knowledgePointIds) ?? []
+    for (const kpId of kps) {
+      const stat = kpMap.get(kpId) ?? { errorCount: 0, masteredCount: 0 }
+      stat.errorCount++
+      if (toStatus(row.status) === "mastered") stat.masteredCount++
+      kpMap.set(kpId, stat)
+    }
+  }
+
+  if (kpMap.size === 0) return []
+
+  // 查询知识点名称及所属章节
+  const kpIds = Array.from(kpMap.keys())
+  const kpRows = await db
+    .select({
+      id: knowledgePoints.id,
+      name: knowledgePoints.name,
+      chapterId: knowledgePoints.chapterId,
+    })
+    .from(knowledgePoints)
+    .where(inArray(knowledgePoints.id, kpIds))
+  const kpInfoMap = new Map(kpRows.map((k) => [k.id, { name: k.name, chapterId: k.chapterId }]))
+
+  // 查询章节标题
+  const chapterIds = Array.from(new Set(
+    kpRows.map((k) => k.chapterId).filter((c): c is string => c !== null)
+  ))
+  let chapterTitleMap = new Map<string, string>()
+  if (chapterIds.length > 0) {
+    const chapterRows = await db
+      .select({ id: chapters.id, title: chapters.title })
+      .from(chapters)
+      .where(inArray(chapters.id, chapterIds))
+    chapterTitleMap = new Map(chapterRows.map((c) => [c.id, c.title]))
+  }
+
+  return Array.from(kpMap.entries())
+    .map(([kpId, stat]) => {
+      const info = kpInfoMap.get(kpId)
+      return {
+        knowledgePointId: kpId,
+        knowledgePointName: info?.name ?? "未知知识点",
+        errorCount: stat.errorCount,
+        masteredCount: stat.masteredCount,
+        totalCount: stat.errorCount,
+        masteryRate: stat.errorCount > 0 ? stat.masteredCount / stat.errorCount : 0,
+        chapterId: info?.chapterId ?? null,
+        chapterTitle: info?.chapterId ? (chapterTitleMap.get(info.chapterId) ?? null) : null,
+      }
+    })
+    .sort((a, b) => {
+      // 按错误数降序，掌握率升序（最薄弱的在前）
+      if (b.errorCount !== a.errorCount) return b.errorCount - a.errorCount
+      return a.masteryRate - b.masteryRate
+    })
+    .slice(0, limit)
+}
+
+/** 查询多个学生的学科错题分布 */
+export async function getSubjectErrorDistribution(
+  studentIds: string[]
+): Promise<Array<{
+  subjectId: string | null
+  subjectName: string
+  errorCount: number
+  masteredCount: number
+  masteryRate: number
+}>> {
+  if (studentIds.length === 0) return []
+
+  // 使用 SQL GROUP BY 聚合
+  const rows = await db
+    .select({
+      subjectId: errorBookItems.subjectId,
+      errorCount: count(),
+      masteredCount: sql<number>`sum(case when ${errorBookItems.status} = 'mastered' then 1 else 0 end)`,
+    })
+    .from(errorBookItems)
+    .where(inArray(errorBookItems.studentId, studentIds))
+    .groupBy(errorBookItems.subjectId)
+
+  // 查询学科名称
+  const subjectIds = rows
+    .map((r) => r.subjectId)
+    .filter((s): s is string => s !== null)
+  let subjectNameMap = new Map<string, string>()
+  if (subjectIds.length > 0) {
+    const subjectRows = await db
+      .select({ id: subjects.id, name: subjects.name })
+      .from(subjects)
+      .where(inArray(subjects.id, subjectIds))
+    subjectNameMap = new Map(subjectRows.map((s) => [s.id, s.name]))
+  }
+
+  return rows.map((row) => {
+    const errorCount = Number(row.errorCount)
+    const masteredCount = Number(row.masteredCount)
+    const sid = row.subjectId
+    return {
+      subjectId: sid,
+      subjectName: sid ? (subjectNameMap.get(sid) ?? "未知学科") : "未分类",
+      errorCount,
+      masteredCount,
+      masteryRate: errorCount > 0 ? masteredCount / errorCount : 0,
+    }
+  })
+}
+
+/**
+ * 查询章节薄弱度统计（哪些课在错）。
+ * 通过 errorBookItems.knowledgePointIds → knowledgePoints.chapterId → chapters 关联。
+ * 支持按学科过滤（通过 errorBookItems.subjectId）。
+ */
+export async function getChapterWeakness(
+  studentIds: string[],
+  limit = 10,
+  subjectId?: string | null
+): Promise<ChapterWeakness[]> {
+  if (studentIds.length === 0) return []
+
+  const whereClause = buildStudentErrorWhereClause(studentIds, subjectId)
+
+  // knowledgePointIds 是 JSON 数组字段，无法直接用 SQL GROUP BY，保留 JS 聚合
+  // 仅查询必要字段（不查询全行）
+  const rows = await db
+    .select({
+      status: errorBookItems.status,
+      knowledgePointIds: errorBookItems.knowledgePointIds,
+    })
+    .from(errorBookItems)
+    .where(whereClause)
+
+  // 展开知识点，建立 kpId → 错题统计（使用类型守卫替代 as 断言）
+  const kpErrorMap = new Map<string, { errorCount: number; masteredCount: number }>()
+  for (const row of rows) {
+    const kps = toStringArray(row.knowledgePointIds) ?? []
+    for (const kpId of kps) {
+      const stat = kpErrorMap.get(kpId) ?? { errorCount: 0, masteredCount: 0 }
+      stat.errorCount++
+      if (toStatus(row.status) === "mastered") stat.masteredCount++
+      kpErrorMap.set(kpId, stat)
+    }
+  }
+
+  if (kpErrorMap.size === 0) return []
+
+  // 查询知识点 → 章节映射
+  const kpIds = Array.from(kpErrorMap.keys())
+  const kpRows = await db
+    .select({
+      id: knowledgePoints.id,
+      name: knowledgePoints.name,
+      chapterId: knowledgePoints.chapterId,
+    })
+    .from(knowledgePoints)
+    .where(inArray(knowledgePoints.id, kpIds))
+
+  // 按章节聚合
+  const chapterMap = new Map<string, {
+    errorCount: number
+    masteredCount: number
+    knowledgePointCount: number
+    topKps: Array<{ knowledgePointId: string; knowledgePointName: string; errorCount: number }>
+  }>()
+
+  for (const kp of kpRows) {
+    if (!kp.chapterId) continue
+    const kpStat = kpErrorMap.get(kp.id)
+    if (!kpStat) continue
+
+    const chapterStat = chapterMap.get(kp.chapterId) ?? {
+      errorCount: 0,
+      masteredCount: 0,
+      knowledgePointCount: 0,
+      topKps: [],
+    }
+    chapterStat.errorCount += kpStat.errorCount
+    chapterStat.masteredCount += kpStat.masteredCount
+    chapterStat.knowledgePointCount++
+    chapterStat.topKps.push({
+      knowledgePointId: kp.id,
+      knowledgePointName: kp.name,
+      errorCount: kpStat.errorCount,
+    })
+    chapterMap.set(kp.chapterId, chapterStat)
+  }
+
+  if (chapterMap.size === 0) return []
+
+  // 查询章节标题
+  const chapterIds = Array.from(chapterMap.keys())
+  const chapterRows = await db
+    .select({ id: chapters.id, title: chapters.title })
+    .from(chapters)
+    .where(inArray(chapters.id, chapterIds))
+  const chapterTitleMap = new Map(chapterRows.map((c) => [c.id, c.title]))
+
+  return Array.from(chapterMap.entries())
+    .map(([chapterId, stat]) => ({
+      chapterId,
+      chapterTitle: chapterTitleMap.get(chapterId) ?? "未知章节",
+      errorCount: stat.errorCount,
+      masteredCount: stat.masteredCount,
+      knowledgePointCount: stat.knowledgePointCount,
+      masteryRate: stat.errorCount > 0 ? stat.masteredCount / stat.errorCount : 0,
+      topKnowledgePoints: stat.topKps
+        .sort((a, b) => b.errorCount - a.errorCount)
+        .slice(0, 3),
+    }))
+    .sort((a, b) => b.errorCount - a.errorCount)
+    .slice(0, limit)
+}
+
+/**
+ * 查询按班级分组的错题概览（教师视图：分班显示）。
+ * 对每个班级统计：学生数、错题总数、人均错题数、平均掌握率、待复习数。
+ * 支持按学科过滤。
+ */
+export async function getClassErrorOverviews(
+  classIds: string[],
+  subjectId?: string | null
+): Promise<ClassErrorOverview[]> {
+  if (classIds.length === 0) return []
+
+  // 查询每个班级的学生
+  const enrollmentRows = await db
+    .select({
+      classId: classEnrollments.classId,
+      studentId: classEnrollments.studentId,
+      className: classes.name,
+    })
+    .from(classEnrollments)
+    .innerJoin(classes, eq(classEnrollments.classId, classes.id))
+    .where(inArray(classEnrollments.classId, classIds))
+
+  const classStudentMap = new Map<string, { className: string; studentIds: Set<string> }>()
+  for (const row of enrollmentRows) {
+    const entry = classStudentMap.get(row.classId) ?? { className: row.className, studentIds: new Set<string>() }
+    entry.studentIds.add(row.studentId)
+    classStudentMap.set(row.classId, entry)
+  }
+
+  // 查询所有相关学生的错题（使用 SQL 聚合按 studentId 分组）
+  const allStudentIds = Array.from(new Set(enrollmentRows.map((r) => r.studentId)))
+  if (allStudentIds.length === 0) return []
+
+  const now = new Date()
+  const whereClause = buildStudentErrorWhereClause(allStudentIds, subjectId)
+  const errorRows = await db
+    .select({
+      studentId: errorBookItems.studentId,
+      total: count(),
+      mastered: sql<number>`sum(case when ${errorBookItems.status} = 'mastered' then 1 else 0 end)`,
+      due: sql<number>`sum(case when ${errorBookItems.status} not in ('mastered', 'archived') and (${errorBookItems.nextReviewAt} is null or ${errorBookItems.nextReviewAt} <= ${now}) then 1 else 0 end)`,
+    })
+    .from(errorBookItems)
+    .where(whereClause)
+    .groupBy(errorBookItems.studentId)
+
+  // 按学生聚合结果映射
+  const studentStatMap = new Map<string, { total: number; mastered: number; due: number }>()
+  for (const row of errorRows) {
+    studentStatMap.set(row.studentId, {
+      total: Number(row.total),
+      mastered: Number(row.mastered),
+      due: Number(row.due),
+    })
+  }
+
+  // 按班级聚合
+  return Array.from(classStudentMap.entries()).map(([classId, entry]) => {
+    const studentIds = Array.from(entry.studentIds)
+    let totalError = 0
+    let totalMastered = 0
+    let totalDue = 0
+    for (const sid of studentIds) {
+      const stat = studentStatMap.get(sid)
+      if (stat) {
+        totalError += stat.total
+        totalMastered += stat.mastered
+        totalDue += stat.due
+      }
+    }
+    return {
+      classId,
+      className: entry.className,
+      studentCount: studentIds.length,
+      totalErrorItems: totalError,
+      averageErrorPerStudent: studentIds.length > 0 ? totalError / studentIds.length : 0,
+      averageMasteryRate: totalError > 0 ? totalMastered / totalError : 0,
+      dueReviewCount: totalDue,
+    }
+  }).sort((a, b) => b.totalErrorItems - a.totalErrorItems)
+}
+
+/**
+ * 查询按学科分组的错题概览（用于学科 Tab 展示）。
+ * 返回每个学科的错题总数、涉及学生数、平均掌握率、待复习数。
+ */
+export async function getSubjectErrorOverviews(
+  studentIds: string[]
+): Promise<SubjectErrorOverview[]> {
+  if (studentIds.length === 0) return []
+
+  const now = new Date()
+  // 使用 SQL GROUP BY 聚合（含 count distinct studentId）
+  const rows = await db
+    .select({
+      subjectId: errorBookItems.subjectId,
+      totalErrorItems: count(),
+      studentCount: sql<number>`count(distinct ${errorBookItems.studentId})`,
+      masteredCount: sql<number>`sum(case when ${errorBookItems.status} = 'mastered' then 1 else 0 end)`,
+      dueReviewCount: sql<number>`sum(case when ${errorBookItems.status} not in ('mastered', 'archived') and (${errorBookItems.nextReviewAt} is null or ${errorBookItems.nextReviewAt} <= ${now}) then 1 else 0 end)`,
+    })
+    .from(errorBookItems)
+    .where(inArray(errorBookItems.studentId, studentIds))
+    .groupBy(errorBookItems.subjectId)
+
+  // 过滤无学科的错题
+  const filtered = rows.filter((r) => r.subjectId !== null)
+  if (filtered.length === 0) return []
+
+  // 查询学科名称
+  const subjectIds = filtered.map((r) => r.subjectId as string)
+  const subjectRows = await db
+    .select({ id: subjects.id, name: subjects.name })
+    .from(subjects)
+    .where(inArray(subjects.id, subjectIds))
+  const subjectNameMap = new Map(subjectRows.map((s) => [s.id, s.name]))
+
+  return filtered
+    .map((row) => {
+      const totalErrorItems = Number(row.totalErrorItems)
+      const masteredCount = Number(row.masteredCount)
+      const sid = row.subjectId as string
+      return {
+        subjectId: sid,
+        subjectName: subjectNameMap.get(sid) ?? "未知学科",
+        totalErrorItems,
+        studentCount: Number(row.studentCount),
+        averageMasteryRate: totalErrorItems > 0 ? masteredCount / totalErrorItems : 0,
+        dueReviewCount: Number(row.dueReviewCount),
+      }
+    })
+    .sort((a, b) => b.totalErrorItems - a.totalErrorItems)
+}
+
+/** 查询学生姓名映射 */
+export async function getStudentNameMap(studentIds: string[]): Promise<Map<string, string>> {
+  if (studentIds.length === 0) return new Map()
+  const rows = await db
+    .select({ id: users.id, name: users.name })
+    .from(users)
+    .where(inArray(users.id, studentIds))
+  return new Map(rows.map((r) => [r.id, r.name ?? "未知"]))
+}
+
+/** 按班级 ID 查询学生 ID 列表（委托给 classes 模块） */
+export async function getStudentIdsByClassIdList(classIds: string[]): Promise<string[]> {
+  return await getStudentIdsByClassIds(classIds)
+}
+
+/**
+ * 查询所有学生用户 ID（管理员视图）。
+ * 通过 usersToRoles + roles 表关联查询 role === "student" 的用户。
+ * 此函数封装了 DB 访问，避免 app 层直接查询 DB（遵循三层架构）。
+ */
+export async function getAllStudentIds(): Promise<string[]> {
+  const { usersToRoles, roles } = await import("@/shared/db/schema")
+  const studentRole = await db
+    .select({ id: roles.id })
+    .from(roles)
+    .where(eq(roles.name, ROLE_NAMES.STUDENT))
+    .limit(1)
+
+  if (studentRole.length === 0) return []
+
+  const userRoleRows = await db
+    .select({ userId: usersToRoles.userId })
+    .from(usersToRoles)
+    .where(eq(usersToRoles.roleId, studentRole[0].id))
+
+  return userRoleRows.map((r) => r.userId)
+}
diff --git a/src/modules/error-book/data-access.ts b/src/modules/error-book/data-access.ts
index 68d906c..7411133 100644
--- a/src/modules/error-book/data-access.ts
+++ b/src/modules/error-book/data-access.ts
@@ -1,23 +1,15 @@
 import "server-only"
 
 import { cache } from "react"
-import { and, count, desc, eq, inArray, isNull, lte, or, sql, type SQL } from "drizzle-orm"
+import { and, count, desc, eq, inArray, isNull, lte, not, or, sql, type SQL } from "drizzle-orm"
 import { createId } from "@paralleldrive/cuid2"
 
 import { db } from "@/shared/db"
 import {
   errorBookItems,
   errorBookReviews,
-  questions,
   questionsToKnowledgePoints,
-  knowledgePoints,
-  chapters,
-  subjects,
-  users,
-  classEnrollments,
-  classes,
 } from "@/shared/db/schema"
-import { getStudentIdsByClassIds } from "@/modules/classes/data-access"
 import {
   calculateNewInterval,
   calculateNewMastery,
@@ -34,18 +26,9 @@ import type {
   ErrorBookStats,
   ErrorBookStatusValue,
   GetErrorBookItemsParams,
-  KnowledgePointWeakness,
-  ChapterWeakness,
-  ClassErrorOverview,
-  SubjectErrorOverview,
-  StudentErrorBookSummary,
 } from "./types"
 import type { ErrorBookReviewResult } from "./schema"
 
-// ---------------------------------------------------------------------------
-// SM-2 间隔重复算法（简化版）
-// ---------------------------------------------------------------------------
-
 // ---------------------------------------------------------------------------
 // 类型守卫
 // ---------------------------------------------------------------------------
@@ -59,27 +42,41 @@ const toReviewResult = (v: string | null | undefined): ErrorBookReviewResult =>
 const isStatus = (v: unknown): v is ErrorBookStatusValue =>
   v === "new" || v === "learning" || v === "mastered" || v === "archived"
 
-const toStatus = (v: string | null | undefined): ErrorBookStatusValue =>
+/** 将数据库状态字符串转换为 ErrorBookStatusValue，无效值回退为 "new" */
+export const toStatus = (v: string | null | undefined): ErrorBookStatusValue =>
   isStatus(v) ? v : "new"
 
+/** 类型守卫：判断未知值是否为 string[] */
+function isStringArray(v: unknown): v is string[] {
+  return Array.isArray(v) && v.every((item) => typeof item === "string")
+}
+
+/** 将未知值安全转换为 string[] | null（用于 JSON 列字段） */
+export function toStringArray(v: unknown): string[] | null {
+  return isStringArray(v) ? v : null
+}
+
 // ---------------------------------------------------------------------------
 // 行映射
 // ---------------------------------------------------------------------------
 
-function mapRowToItem(row: typeof errorBookItems.$inferSelect & {
-  question?: typeof questions.$inferSelect | null
-  subject?: typeof subjects.$inferSelect | null
-}): ErrorBookItem {
+/** 错题条目查询结果类型（含关联的 question/subject 字段） */
+type ErrorBookItemWithRelations = typeof errorBookItems.$inferSelect & {
+  question?: { id: string; content: unknown; type: string; difficulty: number | null } | null
+  subject?: { id: string; name: string } | null
+}
+
+function mapRowToItem(row: ErrorBookItemWithRelations): ErrorBookItem {
   return {
     id: row.id,
     studentId: row.studentId,
     questionId: row.questionId,
-    sourceType: row.sourceType as ErrorBookItem["sourceType"],
+    sourceType: row.sourceType,
     sourceId: row.sourceId,
     studentAnswer: row.studentAnswer,
     correctAnswer: row.correctAnswer,
     subjectId: row.subjectId,
-    knowledgePointIds: row.knowledgePointIds as string[] | null,
+    knowledgePointIds: toStringArray(row.knowledgePointIds),
     status: toStatus(row.status),
     masteryLevel: row.masteryLevel,
     nextReviewAt: row.nextReviewAt,
@@ -87,7 +84,7 @@ function mapRowToItem(row: typeof errorBookItems.$inferSelect & {
     reviewCount: row.reviewCount,
     correctStreak: row.correctStreak,
     note: row.note,
-    errorTags: row.errorTags as string[] | null,
+    errorTags: toStringArray(row.errorTags),
     createdAt: row.createdAt,
     updatedAt: row.updatedAt,
     question: row.question
@@ -126,12 +123,13 @@ export const getErrorBookItems = cache(async (params: GetErrorBookItemsParams):
 
   if (dueOnly) {
     const now = new Date()
-    conditions.push(
-      or(
-        isNull(errorBookItems.nextReviewAt),
-        lte(errorBookItems.nextReviewAt, now)
-      )!
+    const dueCondition = or(
+      isNull(errorBookItems.nextReviewAt),
+      lte(errorBookItems.nextReviewAt, now)
     )
+    if (dueCondition) {
+      conditions.push(dueCondition)
+    }
   }
 
   if (q && q.trim().length > 0) {
@@ -172,7 +170,7 @@ export const getErrorBookItems = cache(async (params: GetErrorBookItemsParams):
   })
 
   return {
-    data: rows.map((row) => mapRowToItem(row as unknown as Parameters<typeof mapRowToItem>[0])),
+    data: rows.map((row) => mapRowToItem(row)),
     meta: {
       page,
       pageSize,
@@ -219,7 +217,7 @@ export const getErrorBookItemById = cache(async (
 
   if (!row) return null
 
-  const base = mapRowToItem(row as unknown as Parameters<typeof mapRowToItem>[0])
+  const base = mapRowToItem(row)
   const reviews: ErrorBookReviewRecord[] = (row.reviews ?? []).map((r) => ({
     id: r.id,
     result: toReviewResult(r.result),
@@ -232,49 +230,65 @@ export const getErrorBookItemById = cache(async (
 })
 
 // ---------------------------------------------------------------------------
-// 查询：错题本统计
+// 查询：错题本统计（SQL 聚合优化）
 // ---------------------------------------------------------------------------
 
 export const getErrorBookStats = cache(async (studentId: string): Promise<ErrorBookStats> => {
   const now = new Date()
 
-  const rows = await db
+  // 使用 SQL GROUP BY 聚合状态计数
+  const statusCounts = await db
     .select({
       status: errorBookItems.status,
-      nextReviewAt: errorBookItems.nextReviewAt,
+      count: count(),
     })
     .from(errorBookItems)
     .where(eq(errorBookItems.studentId, studentId))
+    .groupBy(errorBookItems.status)
 
-  const total = rows.length
+  let totalCount = 0
   let newCount = 0
   let learningCount = 0
   let masteredCount = 0
   let archivedCount = 0
-  let dueReviewCount = 0
 
-  for (const row of rows) {
+  for (const row of statusCounts) {
     const status = toStatus(row.status)
-    if (status === "new") newCount++
-    else if (status === "learning") learningCount++
-    else if (status === "mastered") masteredCount++
-    else if (status === "archived") archivedCount++
-
-    if (status !== "mastered" && status !== "archived") {
-      if (!row.nextReviewAt || row.nextReviewAt <= now) {
-        dueReviewCount++
-      }
-    }
+    totalCount += row.count
+    if (status === "new") newCount = row.count
+    else if (status === "learning") learningCount = row.count
+    else if (status === "mastered") masteredCount = row.count
+    else if (status === "archived") archivedCount = row.count
   }
 
+  // 待复习数：单独查询（status NOT IN mastered/archived AND due）
+  const dueConditions: SQL[] = [
+    eq(errorBookItems.studentId, studentId),
+    not(inArray(errorBookItems.status, ["mastered", "archived"])),
+  ]
+  const dueCondition = or(
+    isNull(errorBookItems.nextReviewAt),
+    lte(errorBookItems.nextReviewAt, now)
+  )
+  if (dueCondition) {
+    dueConditions.push(dueCondition)
+  }
+
+  const dueReviewResult = await db
+    .select({ value: count() })
+    .from(errorBookItems)
+    .where(and(...dueConditions))
+
+  const dueReviewCount = Number(dueReviewResult[0]?.value ?? 0)
+
   return {
-    totalCount: total,
+    totalCount,
     newCount,
     learningCount,
     masteredCount,
     archivedCount,
     dueReviewCount,
-    masteredRate: total > 0 ? masteredCount / total : 0,
+    masteredRate: totalCount > 0 ? masteredCount / totalCount : 0,
   }
 })
 
@@ -448,11 +462,11 @@ export {
 } from "./data-access-collection"
 
 // ---------------------------------------------------------------------------
-// 跨模块查询接口：供教师/家长视图使用
+// 共享工具函数：供 data-access-analytics.ts 使用
 // ---------------------------------------------------------------------------
 
 /** 构建学生错题查询的 where 条件（支持按学科过滤） */
-function buildStudentErrorWhereClause(
+export function buildStudentErrorWhereClause(
   studentIds: string[],
   subjectId?: string | null
 ): SQL | undefined {
@@ -462,568 +476,3 @@ function buildStudentErrorWhereClause(
   }
   return and(...conditions)
 }
-
-/** 查询多个学生的错题统计（教师视图，支持按学科过滤） */
-export async function getStudentErrorBookSummaries(
-  studentIds: string[],
-  subjectId?: string | null
-): Promise<StudentErrorBookSummary[]> {
-  if (studentIds.length === 0) return []
-
-  const now = new Date()
-  const whereClause = buildStudentErrorWhereClause(studentIds, subjectId)
-
-  const rows = await db
-    .select({
-      studentId: errorBookItems.studentId,
-      status: errorBookItems.status,
-      nextReviewAt: errorBookItems.nextReviewAt,
-      updatedAt: errorBookItems.updatedAt,
-    })
-    .from(errorBookItems)
-    .where(whereClause)
-
-  // 查询学生所属班级（用于按班级分组展示）
-  const enrollmentRows = await db
-    .select({
-      studentId: classEnrollments.studentId,
-      classId: classes.id,
-      className: classes.name,
-    })
-    .from(classEnrollments)
-    .innerJoin(classes, eq(classEnrollments.classId, classes.id))
-    .where(inArray(classEnrollments.studentId, studentIds))
-
-  const studentClassMap = new Map<string, { classId: string; className: string }>()
-  for (const row of enrollmentRows) {
-    // 取第一个班级（学生通常只属于一个班）
-    if (!studentClassMap.has(row.studentId)) {
-      studentClassMap.set(row.studentId, { classId: row.classId, className: row.className })
-    }
-  }
-
-  const map = new Map<string, {
-    totalCount: number
-    newCount: number
-    learningCount: number
-    masteredCount: number
-    dueReviewCount: number
-    lastActivityAt: Date | null
-  }>()
-
-  for (const row of rows) {
-    const stat = map.get(row.studentId) ?? {
-      totalCount: 0,
-      newCount: 0,
-      learningCount: 0,
-      masteredCount: 0,
-      dueReviewCount: 0,
-      lastActivityAt: null,
-    }
-    stat.totalCount++
-    const status = toStatus(row.status)
-    if (status === "new") stat.newCount++
-    else if (status === "learning") stat.learningCount++
-    else if (status === "mastered") stat.masteredCount++
-
-    if (status !== "mastered" && status !== "archived") {
-      if (!row.nextReviewAt || row.nextReviewAt <= now) {
-        stat.dueReviewCount++
-      }
-    }
-
-    if (!stat.lastActivityAt || row.updatedAt > stat.lastActivityAt) {
-      stat.lastActivityAt = row.updatedAt
-    }
-
-    map.set(row.studentId, stat)
-  }
-
-  return Array.from(map.entries()).map(([studentId, stat]) => {
-    const classInfo = studentClassMap.get(studentId)
-    return {
-      studentId,
-      ...stat,
-      masteredRate: stat.totalCount > 0 ? stat.masteredCount / stat.totalCount : 0,
-      classId: classInfo?.classId ?? null,
-      className: classInfo?.className ?? null,
-    }
-  })
-}
-
-/** 查询班级内错题最多的题目（教师视图：高频错题，支持按学科过滤） */
-export async function getTopWrongQuestionsByStudentIds(
-  studentIds: string[],
-  limit = 10,
-  subjectId?: string | null
-): Promise<Array<{
-  questionId: string
-  questionContent: unknown
-  questionType: string
-  errorCount: number
-  masteredCount: number
-}>> {
-  if (studentIds.length === 0) return []
-
-  const whereClause = buildStudentErrorWhereClause(studentIds, subjectId)
-
-  const rows = await db
-    .select({
-      questionId: errorBookItems.questionId,
-      status: errorBookItems.status,
-      content: questions.content,
-      type: questions.type,
-    })
-    .from(errorBookItems)
-    .innerJoin(questions, eq(questions.id, errorBookItems.questionId))
-    .where(whereClause)
-
-  const map = new Map<string, { questionContent: unknown; questionType: string; errorCount: number; masteredCount: number }>()
-
-  for (const row of rows) {
-    const stat = map.get(row.questionId) ?? {
-      questionContent: row.content,
-      questionType: row.type,
-      errorCount: 0,
-      masteredCount: 0,
-    }
-    stat.errorCount++
-    if (toStatus(row.status) === "mastered") stat.masteredCount++
-    map.set(row.questionId, stat)
-  }
-
-  return Array.from(map.entries())
-    .map(([questionId, stat]) => ({ questionId, ...stat }))
-    .sort((a, b) => b.errorCount - a.errorCount)
-    .slice(0, limit)
-}
-
-/** 按班级 ID 查询学生 ID 列表（委托给 classes 模块） */
-export async function getStudentIdsByClassIdList(classIds: string[]): Promise<string[]> {
-  return await getStudentIdsByClassIds(classIds)
-}
-
-/**
- * 查询所有学生用户 ID（管理员视图）。
- * 通过 usersToRoles + roles 表关联查询 role === "student" 的用户。
- * 此函数封装了 DB 访问，避免 app 层直接查询 DB（遵循三层架构）。
- */
-export async function getAllStudentIds(): Promise<string[]> {
-  const { usersToRoles, roles } = await import("@/shared/db/schema")
-  const studentRole = await db
-    .select({ id: roles.id })
-    .from(roles)
-    .where(eq(roles.name, "student"))
-    .limit(1)
-
-  if (studentRole.length === 0) return []
-
-  const userRoleRows = await db
-    .select({ userId: usersToRoles.userId })
-    .from(usersToRoles)
-    .where(eq(usersToRoles.roleId, studentRole[0].id))
-
-  return userRoleRows.map((r) => r.userId)
-}
-
-// ---------------------------------------------------------------------------
-// 统计：知识点薄弱度 & 学科分布 & 章节维度（教师/管理员视图）
-// ---------------------------------------------------------------------------
-
-/** 查询多个学生的知识点薄弱度统计（支持按学科过滤，关联章节信息） */
-export async function getKnowledgePointWeakness(
-  studentIds: string[],
-  limit = 10,
-  subjectId?: string | null
-): Promise<KnowledgePointWeakness[]> {
-  if (studentIds.length === 0) return []
-
-  const whereClause = buildStudentErrorWhereClause(studentIds, subjectId)
-
-  // 查询这些学生的所有错题条目（含知识点）
-  const rows = await db
-    .select({
-      itemId: errorBookItems.id,
-      status: errorBookItems.status,
-      knowledgePointIds: errorBookItems.knowledgePointIds,
-    })
-    .from(errorBookItems)
-    .where(whereClause)
-
-  // 展开知识点并统计
-  const kpMap = new Map<string, { errorCount: number; masteredCount: number }>()
-
-  for (const row of rows) {
-    const kps = (row.knowledgePointIds as string[] | null) ?? []
-    for (const kpId of kps) {
-      const stat = kpMap.get(kpId) ?? { errorCount: 0, masteredCount: 0 }
-      stat.errorCount++
-      if (toStatus(row.status) === "mastered") stat.masteredCount++
-      kpMap.set(kpId, stat)
-    }
-  }
-
-  if (kpMap.size === 0) return []
-
-  // 查询知识点名称及所属章节
-  const kpIds = Array.from(kpMap.keys())
-  const kpRows = await db
-    .select({
-      id: knowledgePoints.id,
-      name: knowledgePoints.name,
-      chapterId: knowledgePoints.chapterId,
-    })
-    .from(knowledgePoints)
-    .where(inArray(knowledgePoints.id, kpIds))
-  const kpInfoMap = new Map(kpRows.map((k) => [k.id, { name: k.name, chapterId: k.chapterId }]))
-
-  // 查询章节标题
-  const chapterIds = Array.from(new Set(
-    kpRows.map((k) => k.chapterId).filter((c): c is string => c !== null)
-  ))
-  let chapterTitleMap = new Map<string, string>()
-  if (chapterIds.length > 0) {
-    const chapterRows = await db
-      .select({ id: chapters.id, title: chapters.title })
-      .from(chapters)
-      .where(inArray(chapters.id, chapterIds))
-    chapterTitleMap = new Map(chapterRows.map((c) => [c.id, c.title]))
-  }
-
-  return Array.from(kpMap.entries())
-    .map(([kpId, stat]) => {
-      const info = kpInfoMap.get(kpId)
-      return {
-        knowledgePointId: kpId,
-        knowledgePointName: info?.name ?? "未知知识点",
-        errorCount: stat.errorCount,
-        masteredCount: stat.masteredCount,
-        totalCount: stat.errorCount,
-        masteryRate: stat.errorCount > 0 ? stat.masteredCount / stat.errorCount : 0,
-        chapterId: info?.chapterId ?? null,
-        chapterTitle: info?.chapterId ? (chapterTitleMap.get(info.chapterId) ?? null) : null,
-      }
-    })
-    .sort((a, b) => {
-      // 按错误数降序，掌握率升序（最薄弱的在前）
-      if (b.errorCount !== a.errorCount) return b.errorCount - a.errorCount
-      return a.masteryRate - b.masteryRate
-    })
-    .slice(0, limit)
-}
-
-/** 查询多个学生的学科错题分布 */
-export async function getSubjectErrorDistribution(
-  studentIds: string[]
-): Promise<Array<{
-  subjectId: string | null
-  subjectName: string
-  errorCount: number
-  masteredCount: number
-  masteryRate: number
-}>> {
-  if (studentIds.length === 0) return []
-
-  const rows = await db
-    .select({
-      subjectId: errorBookItems.subjectId,
-      status: errorBookItems.status,
-    })
-    .from(errorBookItems)
-    .where(inArray(errorBookItems.studentId, studentIds))
-
-  const subjectMap = new Map<string | null, { errorCount: number; masteredCount: number }>()
-
-  for (const row of rows) {
-    const key = row.subjectId
-    const stat = subjectMap.get(key) ?? { errorCount: 0, masteredCount: 0 }
-    stat.errorCount++
-    if (toStatus(row.status) === "mastered") stat.masteredCount++
-    subjectMap.set(key, stat)
-  }
-
-  // 查询学科名称
-  const subjectIds = Array.from(subjectMap.keys()).filter((k): k is string => k !== null)
-  let subjectNameMap = new Map<string, string>()
-  if (subjectIds.length > 0) {
-    const subjectRows = await db
-      .select({ id: subjects.id, name: subjects.name })
-      .from(subjects)
-      .where(inArray(subjects.id, subjectIds))
-    subjectNameMap = new Map(subjectRows.map((s) => [s.id, s.name]))
-  }
-
-  return Array.from(subjectMap.entries()).map(([sid, stat]) => ({
-    subjectId: sid,
-    subjectName: sid ? (subjectNameMap.get(sid) ?? "未知学科") : "未分类",
-    errorCount: stat.errorCount,
-    masteredCount: stat.masteredCount,
-    masteryRate: stat.errorCount > 0 ? stat.masteredCount / stat.errorCount : 0,
-  }))
-}
-
-/**
- * 查询章节薄弱度统计（哪些课在错）。
- * 通过 errorBookItems.knowledgePointIds → knowledgePoints.chapterId → chapters 关联。
- * 支持按学科过滤（通过 errorBookItems.subjectId）。
- */
-export async function getChapterWeakness(
-  studentIds: string[],
-  limit = 10,
-  subjectId?: string | null
-): Promise<ChapterWeakness[]> {
-  if (studentIds.length === 0) return []
-
-  const whereClause = buildStudentErrorWhereClause(studentIds, subjectId)
-
-  // 查询错题条目（含知识点和状态）
-  const rows = await db
-    .select({
-      itemId: errorBookItems.id,
-      status: errorBookItems.status,
-      knowledgePointIds: errorBookItems.knowledgePointIds,
-    })
-    .from(errorBookItems)
-    .where(whereClause)
-
-  // 展开知识点，建立 kpId → 错题统计
-  const kpErrorMap = new Map<string, { errorCount: number; masteredCount: number }>()
-  for (const row of rows) {
-    const kps = (row.knowledgePointIds as string[] | null) ?? []
-    for (const kpId of kps) {
-      const stat = kpErrorMap.get(kpId) ?? { errorCount: 0, masteredCount: 0 }
-      stat.errorCount++
-      if (toStatus(row.status) === "mastered") stat.masteredCount++
-      kpErrorMap.set(kpId, stat)
-    }
-  }
-
-  if (kpErrorMap.size === 0) return []
-
-  // 查询知识点 → 章节映射
-  const kpIds = Array.from(kpErrorMap.keys())
-  const kpRows = await db
-    .select({
-      id: knowledgePoints.id,
-      name: knowledgePoints.name,
-      chapterId: knowledgePoints.chapterId,
-    })
-    .from(knowledgePoints)
-    .where(inArray(knowledgePoints.id, kpIds))
-
-  // 按章节聚合
-  const chapterMap = new Map<string, {
-    errorCount: number
-    masteredCount: number
-    knowledgePointCount: number
-    topKps: Array<{ knowledgePointId: string; knowledgePointName: string; errorCount: number }>
-  }>()
-
-  for (const kp of kpRows) {
-    if (!kp.chapterId) continue
-    const kpStat = kpErrorMap.get(kp.id)
-    if (!kpStat) continue
-
-    const chapterStat = chapterMap.get(kp.chapterId) ?? {
-      errorCount: 0,
-      masteredCount: 0,
-      knowledgePointCount: 0,
-      topKps: [],
-    }
-    chapterStat.errorCount += kpStat.errorCount
-    chapterStat.masteredCount += kpStat.masteredCount
-    chapterStat.knowledgePointCount++
-    chapterStat.topKps.push({
-      knowledgePointId: kp.id,
-      knowledgePointName: kp.name,
-      errorCount: kpStat.errorCount,
-    })
-    chapterMap.set(kp.chapterId, chapterStat)
-  }
-
-  if (chapterMap.size === 0) return []
-
-  // 查询章节标题
-  const chapterIds = Array.from(chapterMap.keys())
-  const chapterRows = await db
-    .select({ id: chapters.id, title: chapters.title })
-    .from(chapters)
-    .where(inArray(chapters.id, chapterIds))
-  const chapterTitleMap = new Map(chapterRows.map((c) => [c.id, c.title]))
-
-  return Array.from(chapterMap.entries())
-    .map(([chapterId, stat]) => ({
-      chapterId,
-      chapterTitle: chapterTitleMap.get(chapterId) ?? "未知章节",
-      errorCount: stat.errorCount,
-      masteredCount: stat.masteredCount,
-      knowledgePointCount: stat.knowledgePointCount,
-      masteryRate: stat.errorCount > 0 ? stat.masteredCount / stat.errorCount : 0,
-      topKnowledgePoints: stat.topKps
-        .sort((a, b) => b.errorCount - a.errorCount)
-        .slice(0, 3),
-    }))
-    .sort((a, b) => b.errorCount - a.errorCount)
-    .slice(0, limit)
-}
-
-/**
- * 查询按班级分组的错题概览（教师视图：分班显示）。
- * 对每个班级统计：学生数、错题总数、人均错题数、平均掌握率、待复习数。
- * 支持按学科过滤。
- */
-export async function getClassErrorOverviews(
-  classIds: string[],
-  subjectId?: string | null
-): Promise<ClassErrorOverview[]> {
-  if (classIds.length === 0) return []
-
-  // 查询每个班级的学生
-  const enrollmentRows = await db
-    .select({
-      classId: classEnrollments.classId,
-      studentId: classEnrollments.studentId,
-      className: classes.name,
-    })
-    .from(classEnrollments)
-    .innerJoin(classes, eq(classEnrollments.classId, classes.id))
-    .where(inArray(classEnrollments.classId, classIds))
-
-  const classStudentMap = new Map<string, { className: string; studentIds: Set<string> }>()
-  for (const row of enrollmentRows) {
-    const entry = classStudentMap.get(row.classId) ?? { className: row.className, studentIds: new Set<string>() }
-    entry.studentIds.add(row.studentId)
-    classStudentMap.set(row.classId, entry)
-  }
-
-  // 查询所有相关学生的错题
-  const allStudentIds = Array.from(new Set(enrollmentRows.map((r) => r.studentId)))
-  if (allStudentIds.length === 0) return []
-
-  const whereClause = buildStudentErrorWhereClause(allStudentIds, subjectId)
-  const errorRows = await db
-    .select({
-      studentId: errorBookItems.studentId,
-      status: errorBookItems.status,
-      nextReviewAt: errorBookItems.nextReviewAt,
-    })
-    .from(errorBookItems)
-    .where(whereClause)
-
-  const now = new Date()
-  // 按学生聚合
-  const studentStatMap = new Map<string, { total: number; mastered: number; due: number }>()
-  for (const row of errorRows) {
-    const stat = studentStatMap.get(row.studentId) ?? { total: 0, mastered: 0, due: 0 }
-    stat.total++
-    const status = toStatus(row.status)
-    if (status === "mastered") stat.mastered++
-    if (status !== "mastered" && status !== "archived") {
-      if (!row.nextReviewAt || row.nextReviewAt <= now) stat.due++
-    }
-    studentStatMap.set(row.studentId, stat)
-  }
-
-  // 按班级聚合
-  return Array.from(classStudentMap.entries()).map(([classId, entry]) => {
-    const studentIds = Array.from(entry.studentIds)
-    let totalError = 0
-    let totalMastered = 0
-    let totalDue = 0
-    for (const sid of studentIds) {
-      const stat = studentStatMap.get(sid)
-      if (stat) {
-        totalError += stat.total
-        totalMastered += stat.mastered
-        totalDue += stat.due
-      }
-    }
-    return {
-      classId,
-      className: entry.className,
-      studentCount: studentIds.length,
-      totalErrorItems: totalError,
-      averageErrorPerStudent: studentIds.length > 0 ? totalError / studentIds.length : 0,
-      averageMasteryRate: totalError > 0 ? totalMastered / totalError : 0,
-      dueReviewCount: totalDue,
-    }
-  }).sort((a, b) => b.totalErrorItems - a.totalErrorItems)
-}
-
-/**
- * 查询按学科分组的错题概览（用于学科 Tab 展示）。
- * 返回每个学科的错题总数、涉及学生数、平均掌握率、待复习数。
- */
-export async function getSubjectErrorOverviews(
-  studentIds: string[]
-): Promise<SubjectErrorOverview[]> {
-  if (studentIds.length === 0) return []
-
-  const rows = await db
-    .select({
-      subjectId: errorBookItems.subjectId,
-      studentId: errorBookItems.studentId,
-      status: errorBookItems.status,
-      nextReviewAt: errorBookItems.nextReviewAt,
-    })
-    .from(errorBookItems)
-    .where(inArray(errorBookItems.studentId, studentIds))
-
-  const now = new Date()
-  const subjectMap = new Map<string, {
-    totalErrorItems: number
-    masteredCount: number
-    dueReviewCount: number
-    studentSet: Set<string>
-  }>()
-
-  for (const row of rows) {
-    const key = row.subjectId
-    if (!key) continue // 跳过无学科的错题
-    const stat = subjectMap.get(key) ?? {
-      totalErrorItems: 0,
-      masteredCount: 0,
-      dueReviewCount: 0,
-      studentSet: new Set<string>(),
-    }
-    stat.totalErrorItems++
-    stat.studentSet.add(row.studentId)
-    const status = toStatus(row.status)
-    if (status === "mastered") stat.masteredCount++
-    if (status !== "mastered" && status !== "archived") {
-      if (!row.nextReviewAt || row.nextReviewAt <= now) stat.dueReviewCount++
-    }
-    subjectMap.set(key, stat)
-  }
-
-  if (subjectMap.size === 0) return []
-
-  // 查询学科名称
-  const subjectIds = Array.from(subjectMap.keys())
-  const subjectRows = await db
-    .select({ id: subjects.id, name: subjects.name })
-    .from(subjects)
-    .where(inArray(subjects.id, subjectIds))
-  const subjectNameMap = new Map(subjectRows.map((s) => [s.id, s.name]))
-
-  return Array.from(subjectMap.entries())
-    .map(([sid, stat]) => ({
-      subjectId: sid,
-      subjectName: subjectNameMap.get(sid) ?? "未知学科",
-      totalErrorItems: stat.totalErrorItems,
-      studentCount: stat.studentSet.size,
-      averageMasteryRate: stat.totalErrorItems > 0 ? stat.masteredCount / stat.totalErrorItems : 0,
-      dueReviewCount: stat.dueReviewCount,
-    }))
-    .sort((a, b) => b.totalErrorItems - a.totalErrorItems)
-}
-
-/** 查询学生姓名映射 */
-export async function getStudentNameMap(studentIds: string[]): Promise<Map<string, string>> {
-  if (studentIds.length === 0) return new Map()
-  const rows = await db
-    .select({ id: users.id, name: users.name })
-    .from(users)
-    .where(inArray(users.id, studentIds))
-  return new Map(rows.map((r) => [r.id, r.name ?? "未知"]))
-}