refactor(exams): redesign exam creation page with 3-mode selector

- Replace cramped 3-column grid with vertical layout
- Add 3 large selectable cards at top: Manual / AI / Rich Text Editor
- Rich Text Editor mode redirects to /teacher/exams/new
- Basic info form is now always visible (not hidden in AI mode)
- Exam mode config always visible at bottom
- Add "rich" to mode enum with validation bypass
- Replace all hardcoded English/Chinese strings with i18n keys
- Add 20+ new i18n keys to zh-CN and en (mode labels, descriptions, actions)
- Clean up mixed-language UI text

src/app/(dashboard)/teacher/exams/create/page.tsx

@@ -1,18 +1,18 @@
 import type { JSX } from "react"
+import { getTranslations } from "next-intl/server"
 import { ExamForm } from "@/modules/exams/components/exam-form"
 
 export const dynamic = "force-dynamic"
 
-export default function CreateExamPage(): JSX.Element {
+export default async function CreateExamPage(): Promise<JSX.Element> {
+  const t = await getTranslations("examHomework")
   return (
-    <div className="flex w-full justify-center items-center min-h-[calc(100vh-160px)] p-8 max-w-[1200px] mx-auto">
-      <div className="w-full space-y-6">
-        <div>
-          <h1 className="text-2xl font-bold tracking-tight">Create Exam</h1>
-          <p className="text-muted-foreground">Configure a new exam for your classes.</p>
-        </div>
-        <ExamForm />
+    <div className="mx-auto w-full max-w-[1200px] space-y-6 p-6">
+      <div>
+        <h1 className="text-2xl font-bold tracking-tight">{t("exam.form.createTitle")}</h1>
+        <p className="text-muted-foreground">{t("exam.form.createDescription")}</p>
       </div>
+      <ExamForm />
     </div>
   )
 }

src/modules/exams/components/exam-basic-info-form.tsx

@@ -1,5 +1,6 @@
 "use client"
 
+import { useTranslations } from "next-intl"
 import type { Control } from "react-hook-form"
 import {
   Card,
@@ -20,14 +21,6 @@ type ExamBasicInfoFormProps = {
   loadingGrades: boolean
 }
 
-const DIFFICULTY_OPTIONS = [
-  { value: "1", label: "Level 1 (Easy)" },
-  { value: "2", label: "Level 2" },
-  { value: "3", label: "Level 3 (Medium)" },
-  { value: "4", label: "Level 4" },
-  { value: "5", label: "Level 5 (Hard)" },
-]
-
 export function ExamBasicInfoForm({
   control,
   subjects,
@@ -35,36 +28,46 @@ export function ExamBasicInfoForm({
   loadingSubjects,
   loadingGrades,
 }: ExamBasicInfoFormProps) {
+  const t = useTranslations("examHomework")
+
+  const DIFFICULTY_OPTIONS = [
+    { value: "1", label: t("exam.form.difficultyLevel1") },
+    { value: "2", label: t("exam.form.difficultyLevel2") },
+    { value: "3", label: t("exam.form.difficultyLevel3") },
+    { value: "4", label: t("exam.form.difficultyLevel4") },
+    { value: "5", label: t("exam.form.difficultyLevel5") },
+  ]
+
   return (
     <Card>
       <CardHeader>
-        <CardTitle>Exam Details</CardTitle>
+        <CardTitle>{t("exam.form.detailsTitle")}</CardTitle>
         <CardDescription>
-          Define the core information for your exam.
+          {t("exam.form.detailsDesc")}
         </CardDescription>
       </CardHeader>
       <CardContent className="grid gap-6">
         <TextField
           control={control}
           name="title"
-          label="Title"
-          placeholder="e.g. Midterm Mathematics Exam"
+          label={t("exam.form.title")}
+          placeholder={t("exam.form.titlePlaceholder")}
         />
 
         <div className="grid grid-cols-1 gap-4 md:grid-cols-2">
           <SelectField
             control={control}
             name="subject"
-            label="Subject"
-            placeholder={loadingSubjects ? "Loading subjects..." : "Select subject"}
+            label={t("exam.form.subject")}
+            placeholder={loadingSubjects ? t("exam.form.loadingSubjects") : t("exam.form.subjectPlaceholder")}
             options={subjects.map((s) => ({ value: s.id, label: s.name }))}
             disabled={loadingSubjects}
           />
           <SelectField
             control={control}
             name="grade"
-            label="Grade Level"
-            placeholder={loadingGrades ? "Loading grades..." : "Select grade level"}
+            label={t("exam.form.grade")}
+            placeholder={loadingGrades ? t("exam.form.loadingGrades") : t("exam.form.gradePlaceholder")}
             options={grades.map((g) => ({ value: g.id, label: g.name }))}
             disabled={loadingGrades}
           />
@@ -74,20 +77,20 @@ export function ExamBasicInfoForm({
           <SelectField
             control={control}
             name="difficulty"
-            label="Difficulty"
-            placeholder="Select level"
+            label={t("exam.form.difficulty")}
+            placeholder={t("exam.form.difficultyPlaceholder")}
             options={DIFFICULTY_OPTIONS}
           />
           <TextField
             control={control}
             name="totalScore"
-            label="Total Score"
+            label={t("exam.form.totalScore")}
             type="number"
           />
           <TextField
             control={control}
             name="durationMin"
-            label="Duration (min)"
+            label={t("exam.form.durationMin")}
             type="number"
           />
         </div>
@@ -95,9 +98,9 @@ export function ExamBasicInfoForm({
         <TextField
           control={control}
           name="scheduledAt"
-          label="Schedule Start Time (Optional)"
+          label={t("exam.form.scheduledAt")}
           type="datetime-local"
-          description="If set, this exam will be scheduled for a specific time."
+          description={t("exam.form.scheduledAtDesc")}
         />
       </CardContent>
     </Card>

src/modules/exams/components/exam-form-types.ts

@@ -11,7 +11,7 @@ export const formSchema = z.object({
   totalScore: z.coerce.number().min(1, "Total score must be at least 1.").optional(),
   durationMin: z.coerce.number().min(10, "Duration must be at least 10 minutes.").optional(),
   scheduledAt: z.string().optional(),
-  mode: z.enum(["manual", "ai"]),
+  mode: z.enum(["manual", "ai", "rich"]),
   aiSourceText: z.string().optional(),
   aiQuestionCount: z.coerce.number().min(1).max(200).optional(),
   aiProviderId: z.string().optional(),
@@ -23,6 +23,9 @@ export const formSchema = z.object({
   lateStartGraceMinutes: z.coerce.number().int().min(0).default(0),
   antiCheatEnabled: z.boolean().default(false),
 }).superRefine((data, ctx) => {
+  // 富文本模式不需要表单校验,直接跳转到 /teacher/exams/new
+  if (data.mode === "rich") return
+
   // 监考模式必须设置考试时长
   if (data.examMode === "proctored" && (data.durationMinutes === null || data.durationMinutes === undefined || data.durationMinutes < 1)) {
     ctx.addIssue({

src/modules/exams/components/exam-form.tsx

@@ -2,6 +2,7 @@
 
 import { useTransition, useEffect, useState, type FormEvent } from "react"
 import { useRouter } from "next/navigation"
+import { useTranslations } from "next-intl"
 import { useForm, type Resolver } from "react-hook-form"
 import { zodResolver } from "@hookform/resolvers/zod"
 import { toast } from "sonner"
@@ -24,6 +25,7 @@ export type { ExamFormValues } from "./exam-form-types"
 
 export function ExamForm() {
   const router = useRouter()
+  const t = useTranslations("examHomework")
   const [isPending, startTransition] = useTransition()
   const [subjects, setSubjects] = useState<{ id: string; name: string }[]>([])
   const [loadingSubjects, setLoadingSubjects] = useState(true)
@@ -56,7 +58,7 @@ export function ExamForm() {
             form.setValue("subject", subjectsResult.data[0].id)
           }
         } else {
-          toast.error("Failed to load subjects")
+          toast.error(t("exam.form.loadSubjectsFailed"))
         }
 
         if (gradesResult.success && gradesResult.data) {
@@ -65,7 +67,7 @@ export function ExamForm() {
             form.setValue("grade", gradesResult.data[0].id)
           }
         } else {
-          toast.error("Failed to load grades")
+          toast.error(t("exam.form.loadGradesFailed"))
         }
         if (aiProvidersResult.success && aiProvidersResult.data) {
           setAiProviders(aiProvidersResult.data)
@@ -79,7 +81,7 @@ export function ExamForm() {
         }
       } catch (error) {
         console.error(error)
-        toast.error("Failed to load form data")
+        toast.error(t("exam.form.loadFormFailed"))
       } finally {
         setLoadingSubjects(false)
         setLoadingGrades(false)
@@ -87,10 +89,11 @@ export function ExamForm() {
       }
     }
     void fetchMetadata()
-  }, [form])
+  }, [form, t])
 
   const mode = form.watch("mode")
   const isAiMode = mode === "ai"
+  const isRichMode = mode === "rich"
   const previewSubject = form.watch("subject")
   const previewGrade = form.watch("grade")
   const previewDuration = form.watch("durationMin") ?? 90
@@ -98,6 +101,12 @@ export function ExamForm() {
   const previewTitleValue = form.watch("title")
 
   function onSubmit(data: ExamFormValues) {
+    // 富文本模式不通过表单提交,直接跳转
+    if (data.mode === "rich") {
+      router.push("/teacher/exams/new")
+      return
+    }
+
     const resolvedTitle = data.mode === "ai" && !data.title?.trim() ? "AI Exam" : data.title?.trim() ?? ""
     const resolvedSubject = data.subject?.trim() || subjects[0]?.id || ""
     const resolvedGrade = data.grade?.trim() || grades[0]?.id || ""
@@ -106,13 +115,13 @@ export function ExamForm() {
     const resolvedDurationMin = typeof data.durationMin === "number" && data.durationMin > 0 ? data.durationMin : 90
 
     if (data.mode === "ai" && (!resolvedSubject || !resolvedGrade)) {
-      toast.error("Missing subject or grade configuration")
+      toast.error(t("exam.form.missingSubjectOrGrade"))
       return
     }
     if (data.mode === "ai") {
       const signature = preview.buildPreviewSignature(data)
       if (!preview.previewSignature || signature !== preview.previewSignature || preview.previewNodes.length === 0) {
-        toast.error("Please preview and confirm before creating")
+        toast.error(t("exam.form.previewBeforeCreate"))
         return
       }
     }
@@ -153,17 +162,21 @@ export function ExamForm() {
         : await createExamAction(null, formData)
 
       if (result.success && result.data) {
-        toast.success("Exam draft created", {
-          description: "Redirecting to exam builder...",
+        toast.success(t("exam.form.createSuccess"), {
+          description: t("exam.form.redirecting"),
         })
         router.push(`/teacher/exams/${result.data}/build`)
       } else {
-        toast.error(result.message || "Failed to create exam")
+        toast.error(result.message || t("exam.form.createFailed"))
       }
     })
   }
 
   const handleCreateClick = () => {
+    if (isRichMode) {
+      router.push("/teacher/exams/new")
+      return
+    }
     if (isAiMode) {
       preview.handleBackgroundPreview()
       return
@@ -198,10 +211,20 @@ export function ExamForm() {
   }
 
   return (
-    <div className="grid w-full grid-cols-3 gap-8">
-      <Form {...form}>
-        <form onSubmit={handleFormSubmit} className="col-span-2 space-y-6">
-          {!isAiMode && (
+    <div className="space-y-6">
+      {/* 顶部: 创建方式选择 */}
+      <ExamModeSelector
+        mode={mode}
+        setMode={(value) => form.setValue("mode", value)}
+        isPending={isPending}
+        handleCreateClick={handleCreateClick}
+      />
+
+      {/* 富文本模式: 不显示下方表单 */}
+      {isRichMode ? null : (
+        <Form {...form}>
+          <form onSubmit={handleFormSubmit} className="space-y-6">
+            {/* 基本信息(始终可见) */}
             <ExamBasicInfoForm
               control={form.control}
               subjects={subjects}
@@ -209,27 +232,31 @@ export function ExamForm() {
               loadingSubjects={loadingSubjects}
               loadingGrades={loadingGrades}
             />
-          )}
-          {isAiMode && (
-            <ExamAiGenerator
-              form={form}
-              control={form.control}
-              aiProviders={aiProviders}
-              setAiProviders={setAiProviders}
-              loadingAiProviders={loadingAiProviders}
-              handlePreview={preview.handlePreview}
-              handleBackgroundPreview={preview.handleBackgroundPreview}
-              previewLoading={preview.previewLoading}
-              previewTasks={preview.previewTasks}
-              handleOpenPreviewTask={preview.handleOpenPreviewTask}
-              activePreviewTaskCount={activePreviewTaskCount}
-              runningPreviewTaskCount={runningPreviewTaskCount}
-              queuedPreviewTaskCount={queuedPreviewTaskCount}
-            />
-          )}
-          <ExamModeConfig />
-        </form>
-      </Form>
+
+            {/* AI 模式: 显示 AI 生成器 */}
+            {isAiMode && (
+              <ExamAiGenerator
+                form={form}
+                control={form.control}
+                aiProviders={aiProviders}
+                setAiProviders={setAiProviders}
+                loadingAiProviders={loadingAiProviders}
+                handlePreview={preview.handlePreview}
+                handleBackgroundPreview={preview.handleBackgroundPreview}
+                previewLoading={preview.previewLoading}
+                previewTasks={preview.previewTasks}
+                handleOpenPreviewTask={preview.handleOpenPreviewTask}
+                activePreviewTaskCount={activePreviewTaskCount}
+                runningPreviewTaskCount={runningPreviewTaskCount}
+                queuedPreviewTaskCount={queuedPreviewTaskCount}
+              />
+            )}
+
+            {/* 考试模式配置(始终可见) */}
+            <ExamModeConfig />
+          </form>
+        </Form>
+      )}
 
       <ExamPreviewDialog
         previewOpen={preview.previewOpen}
@@ -254,15 +281,6 @@ export function ExamForm() {
         handleConfirmCreate={handleConfirmCreate}
         previewTitleValue={previewTitleValue}
       />
-
-      <div className="col-span-1 space-y-6">
-        <ExamModeSelector
-          mode={mode}
-          setMode={(value) => form.setValue("mode", value)}
-          isPending={isPending}
-          handleCreateClick={handleCreateClick}
-        />
-      </div>
     </div>
   )
 }

src/modules/exams/components/exam-mode-selector.tsx

@@ -1,20 +1,16 @@
 "use client"
 
-import { Loader2, Sparkles, BookOpen } from "lucide-react"
+import { useRouter } from "next/navigation"
+import { useTranslations } from "next-intl"
+import { Loader2, Sparkles, BookOpen, FileText, ArrowRight } from "lucide-react"
 import { cn } from "@/shared/lib/utils"
 import { Button } from "@/shared/components/ui/button"
-import {
-  Card,
-  CardContent,
-  CardDescription,
-  CardFooter,
-  CardHeader,
-  CardTitle,
-} from "@/shared/components/ui/card"
+
+export type ExamCreationMode = "manual" | "ai" | "rich"
 
 type ExamModeSelectorProps = {
-  mode: "manual" | "ai"
-  setMode: (mode: "manual" | "ai") => void
+  mode: ExamCreationMode
+  setMode: (mode: ExamCreationMode) => void
   isPending: boolean
   handleCreateClick: () => void
 }
@@ -25,61 +21,112 @@ export function ExamModeSelector({
   isPending,
   handleCreateClick,
 }: ExamModeSelectorProps) {
-  return (
-    <Card>
-      <CardHeader>
-        <CardTitle>Assembly Mode</CardTitle>
-        <CardDescription>
-          Choose how to build the exam structure.
-        </CardDescription>
-      </CardHeader>
-      <CardContent>
-        <div className="flex flex-col space-y-3">
-          <button
-            type="button"
-            className={cn(
-              "relative flex cursor-pointer flex-col rounded-lg border p-4 shadow-sm outline-none transition-all hover:bg-accent hover:text-accent-foreground text-left",
-              mode === "manual" ? "border-primary ring-1 ring-primary" : "border-border"
-            )}
-            onClick={() => setMode("manual")}
-          >
-            <div className="flex items-center gap-2">
-              <BookOpen className="h-4 w-4 text-primary" />
-              <span className="font-medium">Manual Assembly</span>
-            </div>
-            <span className="mt-1 text-xs text-muted-foreground">
-              Manually select questions from the bank and organize structure.
-            </span>
-          </button>
+  const router = useRouter()
+  const t = useTranslations("examHomework")
 
-          <button
+  const modes: Array<{
+    key: ExamCreationMode
+    icon: typeof BookOpen
+    title: string
+    description: string
+  }> = [
+    {
+      key: "manual",
+      icon: BookOpen,
+      title: t("exam.form.modeManual"),
+      description: t("exam.form.modeManualDesc"),
+    },
+    {
+      key: "ai",
+      icon: Sparkles,
+      title: t("exam.form.modeAi"),
+      description: t("exam.form.modeAiDesc"),
+    },
+    {
+      key: "rich",
+      icon: FileText,
+      title: t("exam.form.modeRich"),
+      description: t("exam.form.modeRichDesc"),
+    },
+  ]
+
+  return (
+    <div className="space-y-4">
+      {/* 顶部3个大卡片 */}
+      <div className="grid grid-cols-1 gap-4 md:grid-cols-3">
+        {modes.map((m) => {
+          const Icon = m.icon
+          const isActive = mode === m.key
+          return (
+            <button
+              key={m.key}
+              type="button"
+              className={cn(
+                "relative flex cursor-pointer flex-col rounded-lg border-2 p-5 shadow-sm outline-none transition-all text-left",
+                isActive
+                  ? "border-primary bg-primary/5 ring-2 ring-primary/20"
+                  : "border-border hover:border-primary/50 hover:bg-accent/50"
+              )}
+              onClick={() => setMode(m.key)}
+            >
+              <div className="flex items-center gap-2">
+                <div className={cn(
+                  "flex h-10 w-10 items-center justify-center rounded-lg",
+                  isActive ? "bg-primary text-primary-foreground" : "bg-muted text-muted-foreground"
+                )}>
+                  <Icon className="h-5 w-5" />
+                </div>
+                <span className="font-semibold">{m.title}</span>
+              </div>
+              <span className="mt-2 text-sm text-muted-foreground leading-relaxed">
+                {m.description}
+              </span>
+              {isActive && (
+                <div className="absolute right-3 top-3 h-2 w-2 rounded-full bg-primary" />
+              )}
+            </button>
+          )
+        })}
+      </div>
+
+      {/* 富文本模式: 显示跳转按钮 */}
+      {mode === "rich" && (
+        <div className="rounded-lg border bg-muted/30 p-6 text-center">
+          <p className="text-sm text-muted-foreground mb-4">
+            {t("exam.form.modeRichHint")}
+          </p>
+          <Button
             type="button"
-            className={cn(
-              "relative flex cursor-pointer flex-col rounded-lg border p-4 shadow-sm outline-none transition-all hover:bg-accent hover:text-accent-foreground text-left",
-              mode === "ai" ? "border-primary ring-1 ring-primary" : "border-border"
-            )}
-            onClick={() => setMode("ai")}
+            size="lg"
+            onClick={() => router.push("/teacher/exams/new")}
+            className="gap-2"
           >
-            <div className="flex items-center gap-2">
-              <Sparkles className="h-4 w-4 text-primary" />
-              <span className="font-medium">AI Generation</span>
-            </div>
-            <span className="mt-1 text-xs text-muted-foreground">
-              Automatically generate a draft exam based on your input.
-            </span>
-          </button>
+            <FileText className="h-4 w-4" />
+            {t("exam.form.modeRichAction")}
+            <ArrowRight className="h-4 w-4" />
+          </Button>
         </div>
-      </CardContent>
-      <CardFooter>
-        <Button type="button" className="w-full" disabled={isPending} onClick={handleCreateClick}>
-          {isPending && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
-          {isPending
-            ? "Creating Draft..."
-            : mode === "ai"
-              ? "后台生成试卷"
-              : "Create & Start Building"}
-        </Button>
-      </CardFooter>
-    </Card>
+      )}
+
+      {/* 手动/AI 模式: 显示创建按钮 */}
+      {mode !== "rich" && (
+        <div className="flex justify-end">
+          <Button
+            type="button"
+            size="lg"
+            disabled={isPending}
+            onClick={handleCreateClick}
+            className="gap-2 min-w-[200px]"
+          >
+            {isPending && <Loader2 className="h-4 w-4 animate-spin" />}
+            {isPending
+              ? t("exam.form.creating")
+              : mode === "ai"
+                ? t("exam.form.modeAiAction")
+                : t("exam.form.modeManualAction")}
+          </Button>
+        </div>
+      )}
+    </div>
   )
 }

src/shared/i18n/messages/en/exam-homework.json

@@ -32,7 +32,32 @@
       "createFailed": "Failed to create exam",
       "loadFormFailed": "Failed to load form data",
       "loadSubjectsFailed": "Failed to load subjects",
-      "loadGradesFailed": "Failed to load grades"
+      "loadGradesFailed": "Failed to load grades",
+      "creating": "Creating...",
+      "detailsTitle": "Exam Details",
+      "detailsDesc": "Define the core information for your exam.",
+      "titlePlaceholder": "e.g. Midterm Mathematics Exam",
+      "subjectPlaceholder": "Select subject",
+      "gradePlaceholder": "Select grade level",
+      "difficultyPlaceholder": "Select level",
+      "difficultyLevel1": "Level 1 (Easy)",
+      "difficultyLevel2": "Level 2",
+      "difficultyLevel3": "Level 3 (Medium)",
+      "difficultyLevel4": "Level 4",
+      "difficultyLevel5": "Level 5 (Hard)",
+      "loadingSubjects": "Loading subjects...",
+      "loadingGrades": "Loading grades...",
+      "scheduledAtDesc": "If set, this exam will be scheduled for a specific time.",
+      "modeManual": "Manual Assembly",
+      "modeManualDesc": "Manually select questions from the bank and organize structure.",
+      "modeManualAction": "Create & Start Building",
+      "modeAi": "AI Generation",
+      "modeAiDesc": "Paste exam text and AI will auto-parse questions into structured preview.",
+      "modeAiAction": "Generate in Background",
+      "modeRich": "Rich Text Editor",
+      "modeRichDesc": "Use rich text editor to paste exam text, manually or AI-assisted marking of questions, groups, blanks, etc.",
+      "modeRichHint": "The rich text editor supports selecting text to mark as questions/groups/dotted chars/blanks, with live preview on the right.",
+      "modeRichAction": "Open Rich Text Editor"
     },
     "status": {
       "draft": "Draft",

src/shared/i18n/messages/zh-CN/exam-homework.json

@@ -32,7 +32,32 @@
       "createFailed": "创建考试失败",
       "loadFormFailed": "加载表单数据失败",
       "loadSubjectsFailed": "加载科目失败",
-      "loadGradesFailed": "加载年级失败"
+      "loadGradesFailed": "加载年级失败",
+      "creating": "创建中...",
+      "detailsTitle": "基本信息",
+      "detailsDesc": "设置考试的核心信息。",
+      "titlePlaceholder": "例如:期中数学考试",
+      "subjectPlaceholder": "选择科目",
+      "gradePlaceholder": "选择年级",
+      "difficultyPlaceholder": "选择难度",
+      "difficultyLevel1": "1级 (简单)",
+      "difficultyLevel2": "2级",
+      "difficultyLevel3": "3级 (中等)",
+      "difficultyLevel4": "4级",
+      "difficultyLevel5": "5级 (困难)",
+      "loadingSubjects": "加载科目中...",
+      "loadingGrades": "加载年级中...",
+      "scheduledAtDesc": "设置后,考试将在指定时间开放。",
+      "modeManual": "手动组卷",
+      "modeManualDesc": "从题库手动选择题目并组织试卷结构。",
+      "modeManualAction": "创建并开始组卷",
+      "modeAi": "AI 生成",
+      "modeAiDesc": "粘贴试卷文本,AI 自动解析题目并生成结构化预览。",
+      "modeAiAction": "后台生成试卷",
+      "modeRich": "富文本编辑器",
+      "modeRichDesc": "使用富文本编辑器粘贴试卷文本,手动或 AI 辅助标记题目、分组、填空等。",
+      "modeRichHint": "富文本编辑器支持选中文本标记题目/分组/加点字/填空,右侧实时预览试卷效果。",
+      "modeRichAction": "打开富文本编辑器"
     },
     "status": {
       "draft": "草稿",