diff --git a/src/components/question/KnowledgeCardFields.tsx b/src/components/question/KnowledgeCardFields.tsx
index 6551ae7..ab1c853 100644
--- a/src/components/question/KnowledgeCardFields.tsx
+++ b/src/components/question/KnowledgeCardFields.tsx
@@ -13,42 +13,42 @@ import {
 } from "@/components/ui/card"
 import { Badge } from "@/components/ui/badge"
 
-const BASIC_MAX = 100
-const DEEP_MAX = 300
+const SUMMARY_MAX = 2000
+const DEEP_DIVE_MAX = 300
 
 interface KnowledgeCardFieldsProps {
-  basicRegister: UseFormRegisterReturn
-  deepRegister: UseFormRegisterReturn
+  summaryRegister: UseFormRegisterReturn
+  deepDiveRegister: UseFormRegisterReturn
   sourceRefRegister: UseFormRegisterReturn
-  basicError?: string
-  deepError?: string
-  watchBasic: string
-  watchDeep: string
+  summaryError?: string
+  deepDiveError?: string
+  watchSummary: string
+  watchDeepDive: string
 }
 
 export function KnowledgeCardFields({
-  basicRegister,
-  deepRegister,
+  summaryRegister,
+  deepDiveRegister,
   sourceRefRegister,
-  basicError,
-  deepError,
-  watchBasic,
-  watchDeep,
+  summaryError,
+  deepDiveError,
+  watchSummary,
+  watchDeepDive,
 }: KnowledgeCardFieldsProps) {
   const [showPreview, setShowPreview] = useState(false)
-  const [deepExpanded, setDeepExpanded] = useState(!!watchDeep)
+  const [deepExpanded, setDeepExpanded] = useState(!!watchDeepDive)
 
-  const basicCount = watchBasic.length
-  const deepCount = watchDeep.length
-  const basicOver = basicCount > BASIC_MAX
-  const deepOver = deepCount > DEEP_MAX
+  const summaryCount = watchSummary.length
+  const deepCount = watchDeepDive.length
+  const summaryOver = summaryCount > SUMMARY_MAX
+  const deepOver = deepCount > DEEP_DIVE_MAX
 
   return (
     <div className="space-y-4">
-      {/* 基础版 */}
+      {/* 摘要 */}
       <div className="space-y-2">
         <div className="flex items-center gap-2">
-          <Label htmlFor="knowledgeCardBasic">知识卡（基础版）</Label>
+          <Label htmlFor="cardSummary">知识卡摘要</Label>
           <Badge variant="secondary" className="text-xs">
             所有用户可见
           </Badge>
@@ -57,31 +57,31 @@ export function KnowledgeCardFields({
           2-3 句趣味解读，让用户答完题后学到新知识
         </p>
         <Textarea
-          id="knowledgeCardBasic"
+          id="cardSummary"
           placeholder="例：唐太宗李世民不仅是千古一帝，还是书法发烧友。他最爱王羲之的字，据说《兰亭集序》真迹被他带进了昭陵。"
           rows={3}
-          {...basicRegister}
+          {...summaryRegister}
         />
         <div className="flex items-center justify-between">
-          {basicError && (
-            <p className="text-sm text-destructive">{basicError}</p>
+          {summaryError && (
+            <p className="text-sm text-destructive">{summaryError}</p>
           )}
           <span
-            className={`ml-auto text-xs ${basicOver ? "text-destructive font-medium" : "text-muted-foreground"}`}
+            className={`ml-auto text-xs ${summaryOver ? "text-destructive font-medium" : "text-muted-foreground"}`}
           >
-            {basicCount}/{BASIC_MAX}
+            {summaryCount}/{SUMMARY_MAX}
           </span>
         </div>
       </div>
 
-      {/* 深度版 */}
+      {/* 深度解析 */}
       <div className="space-y-2">
         <button
           type="button"
           className="flex items-center gap-2"
           onClick={() => setDeepExpanded((prev) => !prev)}
         >
-          <Label className="cursor-pointer">知识卡（深度版）</Label>
+          <Label className="cursor-pointer">深度解析</Label>
           <Badge variant="outline" className="text-xs">
             Pro 用户可见
           </Badge>
@@ -98,16 +98,16 @@ export function KnowledgeCardFields({
             <Textarea
               placeholder="例：王羲之写《兰亭集序》时喝了点酒，一气呵成。后来他多次重写都不满意，感叹「此神助耳，何吾能力致」。唐太宗派萧翼用计从辩才和尚手中骗得真迹，临终遗命将真迹陪葬昭陵。不过近年有学者认为，真迹可能并未入昭陵，而是另有下落……"
               rows={5}
-              {...deepRegister}
+              {...deepDiveRegister}
             />
             <div className="flex items-center justify-between">
-              {deepError && (
-                <p className="text-sm text-destructive">{deepError}</p>
+              {deepDiveError && (
+                <p className="text-sm text-destructive">{deepDiveError}</p>
               )}
               <span
                 className={`ml-auto text-xs ${deepOver ? "text-destructive font-medium" : "text-muted-foreground"}`}
               >
-                {deepCount}/{DEEP_MAX}
+                {deepCount}/{DEEP_DIVE_MAX}
               </span>
             </div>
           </>
@@ -116,12 +116,12 @@ export function KnowledgeCardFields({
 
       {/* 来源参考 */}
       <div className="space-y-2">
-        <Label htmlFor="sourceRef">
+        <Label htmlFor="cardSourceRef">
           来源参考
           <span className="ml-1 text-muted-foreground font-normal">选填</span>
         </Label>
         <Input
-          id="sourceRef"
+          id="cardSourceRef"
           placeholder="如：《旧唐书·太宗本纪》"
           {...sourceRefRegister}
         />
@@ -146,14 +146,14 @@ export function KnowledgeCardFields({
             </CardDescription>
           </CardHeader>
           <CardContent className="space-y-3">
-            {watchBasic ? (
-              <p className="text-sm leading-relaxed">{watchBasic}</p>
+            {watchSummary ? (
+              <p className="text-sm leading-relaxed">{watchSummary}</p>
             ) : (
               <p className="text-sm text-muted-foreground italic">
-                （基础版内容为空）
+                （摘要内容为空）
               </p>
             )}
-            {watchDeep && (
+            {watchDeepDive && (
               <>
                 <div className="border-t pt-3">
                   <div className="flex items-center gap-1 mb-1">
@@ -165,7 +165,7 @@ export function KnowledgeCardFields({
                     </span>
                   </div>
                   <p className="text-sm leading-relaxed text-muted-foreground">
-                    {watchDeep}
+                    {watchDeepDive}
                   </p>
                 </div>
               </>
diff --git a/src/components/question/QuestionForm.tsx b/src/components/question/QuestionForm.tsx
index c8d4370..edc51f2 100644
--- a/src/components/question/QuestionForm.tsx
+++ b/src/components/question/QuestionForm.tsx
@@ -18,12 +18,14 @@ import {
 import { DistractorEditor } from "@/components/question/DistractorEditor"
 import { KnowledgeCardFields } from "@/components/question/KnowledgeCardFields"
 import { fetchCategories } from "@/lib/api/category-api"
+import { createQuestion, updateQuestion } from "@/lib/api/question-api"
 import { DIFFICULTY_LABELS, QUESTION_STATUSES } from "@/lib/constants"
-import type { Question, Difficulty, QuestionStatus } from "@/types/question"
+import type { Question, Difficulty, QuestionStatus, QuestionContentType } from "@/types/question"
 import type { Category } from "@/types/category"
 
 const questionSchema = z.object({
-  stem: z.string().min(1, "请输入题干").max(500),
+  stemText: z.string().min(1, "请输入题干").max(500),
+  contentType: z.enum(["text", "image", "video", "audio"]),
   correctAnswer: z.string().min(1, "请输入正确答案"),
   distractors: z
     .array(z.string().min(1, "干扰项不能为空"))
@@ -32,9 +34,9 @@ const questionSchema = z.object({
   categoryId: z.string().min(1, "请选择分类"),
   difficulty: z.number().min(1).max(5),
   status: z.enum(["draft", "reviewing", "published", "archived"]),
-  knowledgeCardBasic: z.string().min(1, "请填写基础知识卡").max(100),
-  knowledgeCardDeep: z.string().max(300).optional(),
-  sourceRef: z.string().max(500).optional(),
+  cardSummary: z.string().max(2000).optional(),
+  cardDeepDive: z.string().max(300).optional(),
+  cardSourceRef: z.string().max(500).optional(),
 })
 
 type FormValues = z.infer<typeof questionSchema>
@@ -59,26 +61,28 @@ export function QuestionForm({ question }: QuestionFormProps) {
     resolver: zodResolver(questionSchema),
     defaultValues: question
       ? {
-          stem: question.stem,
+          stemText: (question.stem as { text: string }).text,
+          contentType: question.contentType ?? "text" as QuestionContentType,
           correctAnswer: question.correctAnswer,
           distractors: question.distractors,
           categoryId: question.categoryId,
           difficulty: question.difficulty,
           status: question.status,
-          knowledgeCardBasic: question.knowledgeCardBasic,
-          knowledgeCardDeep: question.knowledgeCardDeep ?? "",
-          sourceRef: question.sourceRef ?? "",
+          cardSummary: question.knowledgeCard?.summary ?? "",
+          cardDeepDive: question.knowledgeCard?.deepDive ?? "",
+          cardSourceRef: question.knowledgeCard?.sourceRef ?? "",
         }
       : {
-          stem: "",
+          stemText: "",
+          contentType: "text" as QuestionContentType,
           correctAnswer: "",
           distractors: ["", "", "", ""],
           categoryId: "",
           difficulty: 3,
           status: "draft",
-          knowledgeCardBasic: "",
-          knowledgeCardDeep: "",
-          sourceRef: "",
+          cardSummary: "",
+          cardDeepDive: "",
+          cardSourceRef: "",
         },
   })
 
@@ -89,8 +93,27 @@ export function QuestionForm({ question }: QuestionFormProps) {
   async function onSubmit(data: FormValues) {
     setSubmitting(true)
     try {
-      // TODO: 接入 API
-      console.log("submit", isEditing ? "update" : "create", data)
+      const payload = {
+        stem: { text: data.stemText },
+        contentType: data.contentType,
+        correctAnswer: data.correctAnswer,
+        distractors: data.distractors,
+        categoryId: data.categoryId,
+        difficulty: data.difficulty as Difficulty,
+        knowledgeCard: data.cardSummary
+          ? {
+              summary: data.cardSummary,
+              deepDive: data.cardDeepDive || undefined,
+              sourceRef: data.cardSourceRef || undefined,
+            }
+          : undefined,
+      }
+
+      if (isEditing && question) {
+        await updateQuestion(question.id, payload)
+      } else {
+        await createQuestion(payload)
+      }
       navigate("/questions")
     } finally {
       setSubmitting(false)
@@ -103,18 +126,37 @@ export function QuestionForm({ question }: QuestionFormProps) {
     <form onSubmit={handleSubmit(onSubmit)} className="max-w-2xl space-y-6">
       {/* 题干 */}
       <div className="space-y-2">
-        <Label htmlFor="stem">题干</Label>
+        <Label htmlFor="stemText">题干</Label>
         <Textarea
-          id="stem"
+          id="stemText"
           placeholder="输入题目文字"
           rows={3}
-          {...register("stem")}
+          {...register("stemText")}
         />
-        {errors.stem && (
-          <p className="text-sm text-destructive">{errors.stem.message}</p>
+        {errors.stemText && (
+          <p className="text-sm text-destructive">{errors.stemText.message}</p>
         )}
       </div>
 
+      {/* 内容类型 */}
+      <div className="space-y-2">
+        <Label>内容类型</Label>
+        <Select
+          value={watch("contentType")}
+          onValueChange={(val) => setValue("contentType", val as QuestionContentType)}
+        >
+          <SelectTrigger className="w-40">
+            <SelectValue />
+          </SelectTrigger>
+          <SelectContent>
+            <SelectItem value="text">文本</SelectItem>
+            <SelectItem value="image">图片</SelectItem>
+            <SelectItem value="video">视频</SelectItem>
+            <SelectItem value="audio">音频</SelectItem>
+          </SelectContent>
+        </Select>
+      </div>
+
       {/* 正确答案 */}
       <div className="space-y-2">
         <Label htmlFor="correctAnswer">正确答案</Label>
@@ -214,13 +256,13 @@ export function QuestionForm({ question }: QuestionFormProps) {
 
       {/* 知识卡 */}
       <KnowledgeCardFields
-        basicRegister={register("knowledgeCardBasic")}
-        deepRegister={register("knowledgeCardDeep")}
-        sourceRefRegister={register("sourceRef")}
-        basicError={errors.knowledgeCardBasic?.message}
-        deepError={errors.knowledgeCardDeep?.message}
-        watchBasic={watch("knowledgeCardBasic") ?? ""}
-        watchDeep={watch("knowledgeCardDeep") ?? ""}
+        summaryRegister={register("cardSummary")}
+        deepDiveRegister={register("cardDeepDive")}
+        sourceRefRegister={register("cardSourceRef")}
+        summaryError={errors.cardSummary?.message}
+        deepDiveError={errors.cardDeepDive?.message}
+        watchSummary={watch("cardSummary") ?? ""}
+        watchDeepDive={watch("cardDeepDive") ?? ""}
       />
 
       {/* 提交 */}
diff --git a/src/components/question/StatusTransitionDialog.tsx b/src/components/question/StatusTransitionDialog.tsx
index 0ff7fb4..cec0296 100644
--- a/src/components/question/StatusTransitionDialog.tsx
+++ b/src/components/question/StatusTransitionDialog.tsx
@@ -46,7 +46,7 @@ export function StatusTransitionDialog({
                 <StatusBadge status={targetStatus} />
               </div>
               <p className="text-xs text-muted-foreground">
-                题目：{question.stem.length > 40 ? question.stem.slice(0, 40) + "..." : question.stem}
+                题目：{question.stem.text.length > 40 ? question.stem.text.slice(0, 40) + "..." : question.stem.text}
               </p>
             </div>
           </AlertDialogDescription>
diff --git a/src/components/question/UgcReviewDialog.tsx b/src/components/question/UgcReviewDialog.tsx
index 2df9a07..313b909 100644
--- a/src/components/question/UgcReviewDialog.tsx
+++ b/src/components/question/UgcReviewDialog.tsx
@@ -95,7 +95,7 @@ export function UgcReviewDialog({
             </div>
             <div>
               <Label className="text-muted-foreground">来源</Label>
-              <p className="font-medium">{QUESTION_SOURCE_LABELS[question.source]}</p>
+              <p className="font-medium">{question.source ? QUESTION_SOURCE_LABELS[question.source] : "—"}</p>
             </div>
             <div>
               <Label className="text-muted-foreground">状态</Label>
@@ -108,7 +108,7 @@ export function UgcReviewDialog({
           {/* 题干 */}
           <div>
             <Label className="text-muted-foreground">题干</Label>
-            <p className="mt-1 text-sm leading-relaxed">{question.stem}</p>
+            <p className="mt-1 text-sm leading-relaxed">{(question.stem as { text: string }).text}</p>
           </div>
 
           {/* 正确答案 */}
@@ -130,37 +130,50 @@ export function UgcReviewDialog({
           </div>
 
           {/* 知识卡 */}
-          <div>
-            <Label className="text-muted-foreground">基础知识卡</Label>
-            <p className="mt-1 text-sm leading-relaxed">{question.knowledgeCardBasic}</p>
-          </div>
+          {question.knowledgeCard && (
+            <>
+              <div>
+                <Label className="text-muted-foreground">知识卡摘要</Label>
+                <p className="mt-1 text-sm leading-relaxed">{question.knowledgeCard.summary}</p>
+              </div>
 
-          {question.knowledgeCardDeep && (
-            <div>
-              <Label className="text-muted-foreground">深度知识卡（Pro）</Label>
-              <p className="mt-1 text-sm leading-relaxed text-muted-foreground">
-                {question.knowledgeCardDeep}
-              </p>
-            </div>
+              {question.knowledgeCard.deepDive && (
+                <div>
+                  <Label className="text-muted-foreground">深度解析（Pro）</Label>
+                  <p className="mt-1 text-sm leading-relaxed text-muted-foreground">
+                    {question.knowledgeCard.deepDive}
+                  </p>
+                </div>
+              )}
+
+              {question.knowledgeCard.sourceRef && (
+                <div>
+                  <Label className="text-muted-foreground">来源参考</Label>
+                  <p className="mt-1 text-sm text-muted-foreground">{question.knowledgeCard.sourceRef}</p>
+                </div>
+              )}
+            </>
           )}
 
           <Separator />
 
           {/* 统计信息 */}
-          <div className="grid grid-cols-3 gap-4 text-sm">
-            <div>
-              <Label className="text-muted-foreground">答题次数</Label>
-              <p className="font-medium">{question.stats.timesAnswered}</p>
+          {question.stats && (
+            <div className="grid grid-cols-3 gap-4 text-sm">
+              <div>
+                <Label className="text-muted-foreground">答题次数</Label>
+                <p className="font-medium">{question.stats.timesAnswered}</p>
+              </div>
+              <div>
+                <Label className="text-muted-foreground">正确率</Label>
+                <p className="font-medium">{(question.stats.correctRate * 100).toFixed(0)}%</p>
+              </div>
+              <div>
+                <Label className="text-muted-foreground">平均用时</Label>
+                <p className="font-medium">{(question.stats.avgTimeMs / 1000).toFixed(1)}秒</p>
+              </div>
             </div>
-            <div>
-              <Label className="text-muted-foreground">正确率</Label>
-              <p className="font-medium">{(question.stats.correctRate * 100).toFixed(0)}%</p>
-            </div>
-            <div>
-              <Label className="text-muted-foreground">平均用时</Label>
-              <p className="font-medium">{(question.stats.avgTimeMs / 1000).toFixed(1)}秒</p>
-            </div>
-          </div>
+          )}
 
           <Separator />
 
diff --git a/src/components/question/columns.tsx b/src/components/question/columns.tsx
index d0f1efb..e4248b6 100644
--- a/src/components/question/columns.tsx
+++ b/src/components/question/columns.tsx
@@ -57,10 +57,11 @@ export function getColumns(ctx: ColumnContext): ColumnDef<Question>[] {
       accessorKey: "stem",
       header: "题干",
       cell: ({ row }) => {
-        const stem = row.getValue("stem") as string
+        const stem = row.getValue("stem") as { text: string } | undefined
+        const text = stem?.text ?? ""
         return (
-          <span className="line-clamp-2 max-w-xs" title={stem}>
-            {stem.length > 60 ? stem.slice(0, 60) + "..." : stem}
+          <span className="line-clamp-2 max-w-xs" title={text}>
+            {text.length > 60 ? text.slice(0, 60) + "..." : text}
           </span>
         )
       },
@@ -82,7 +83,8 @@ export function getColumns(ctx: ColumnContext): ColumnDef<Question>[] {
       accessorKey: "source",
       header: "来源",
       cell: ({ row }) => {
-        const source = row.getValue("source") as "system" | "ugc"
+        const source = row.getValue("source") as "system" | "ugc" | undefined
+        if (!source) return <span className="text-muted-foreground">—</span>
         return (
           <Badge variant={source === "system" ? "default" : "secondary"}>
             {QUESTION_SOURCE_LABELS[source]}
@@ -136,10 +138,11 @@ export function getColumns(ctx: ColumnContext): ColumnDef<Question>[] {
       id: "stats",
       header: "统计",
       cell: ({ row }) => {
-        const { timesAnswered, correctRate } = row.original.stats
+        const stats = row.original.stats
+        if (!stats) return <span className="text-muted-foreground text-xs">—</span>
         return (
           <span className="text-muted-foreground text-xs">
-            {timesAnswered} 次 · {(correctRate * 100).toFixed(0)}%
+            {stats.timesAnswered} 次 · {(stats.correctRate * 100).toFixed(0)}%
           </span>
         )
       },
diff --git a/src/lib/api/question-api.ts b/src/lib/api/question-api.ts
index 71ef5d0..cc38bc4 100644
--- a/src/lib/api/question-api.ts
+++ b/src/lib/api/question-api.ts
@@ -13,13 +13,13 @@ import type {
 export interface FetchQuestionsParams {
   page?: number
   limit?: number
-  search?: string
+  keyword?: string
   status?: QuestionStatus
   categoryId?: string
   difficulty?: Difficulty
   source?: "system" | "ugc"
-  sort?: "createdAt" | "difficulty" | "updatedAt"
-  order?: "asc" | "desc"
+  sortBy?: "createdAt" | "difficulty" | "updatedAt"
+  sortOrder?: "asc" | "desc"
 }
 
 export async function fetchQuestions(
@@ -28,13 +28,13 @@ export async function fetchQuestions(
   const searchParams = new URLSearchParams()
   if (params.page) searchParams.set("page", String(params.page))
   if (params.limit) searchParams.set("limit", String(params.limit))
-  if (params.search) searchParams.set("search", params.search)
+  if (params.keyword) searchParams.set("keyword", params.keyword)
   if (params.status) searchParams.set("status", params.status)
   if (params.categoryId) searchParams.set("categoryId", params.categoryId)
   if (params.difficulty) searchParams.set("difficulty", String(params.difficulty))
   if (params.source) searchParams.set("source", params.source)
-  if (params.sort) searchParams.set("sort", params.sort)
-  if (params.order) searchParams.set("order", params.order)
+  if (params.sortBy) searchParams.set("sortBy", params.sortBy)
+  if (params.sortOrder) searchParams.set("sortOrder", params.sortOrder)
 
   return apiClient
     .get("questions", { searchParams })
diff --git a/src/routes/questions/index.tsx b/src/routes/questions/index.tsx
index 3e1c5a1..3e9ff8f 100644
--- a/src/routes/questions/index.tsx
+++ b/src/routes/questions/index.tsx
@@ -126,15 +126,15 @@ export default function QuestionsPage() {
       const res = await fetchQuestions({
         page,
         limit: PAGE_SIZE,
-        search: search || undefined,
+        keyword: search || undefined,
         status: statusFilter !== "all" ? statusFilter : undefined,
         categoryId: categoryFilter !== "all" ? categoryFilter : undefined,
         difficulty: difficultyFilter !== "all"
           ? (Number(difficultyFilter) as Difficulty)
           : undefined,
         source: sourceTab !== "all" ? sourceTab : undefined,
-        sort: sortField,
-        order: sortOrder,
+        sortBy: sortField,
+        sortOrder,
       })
       setQuestions(res.data)
       setTotal(res.pagination.total)
@@ -289,14 +289,14 @@ export default function QuestionsPage() {
     try {
       const res = await fetchQuestions({
         limit: 10000,
-        search: search || undefined,
+        keyword: search || undefined,
         status: statusFilter !== "all" ? statusFilter : undefined,
         categoryId: categoryFilter !== "all" ? categoryFilter : undefined,
         difficulty: difficultyFilter !== "all"
           ? (Number(difficultyFilter) as Difficulty)
           : undefined,
-        sort: sortField,
-        order: sortOrder,
+        sortBy: sortField,
+        sortOrder,
       })
       exportToCsv("questions.csv", [
         { key: "stem", label: "题干" },
diff --git a/src/types/question.ts b/src/types/question.ts
index 5fe050d..a750969 100644
--- a/src/types/question.ts
+++ b/src/types/question.ts
@@ -1,43 +1,60 @@
 export type QuestionStatus = "draft" | "reviewing" | "published" | "archived"
 export type Difficulty = 1 | 2 | 3 | 4 | 5
+export type QuestionContentType = "text" | "image" | "video" | "audio"
+
+/** Stem structure matching duoqi-api — at least `text` field */
+export interface QuestionStem {
+  text: string
+  [key: string]: unknown
+}
+
+/** Knowledge card nested object matching duoqi-api */
+export interface KnowledgeCard {
+  id?: string
+  summary: string
+  deepDive?: string
+  sourceRef?: string
+}
 
 export interface Question {
   id: string
-  stem: string
+  stem: QuestionStem
+  contentType: QuestionContentType
   correctAnswer: string
   distractors: string[]
   categoryId: string
   difficulty: Difficulty
   status: QuestionStatus
-  knowledgeCardBasic: string
-  knowledgeCardDeep?: string
-  sourceRef?: string
-  source: "system" | "ugc"
-  stats: {
+  knowledgeCard?: KnowledgeCard
+  /** Optional — not returned by list endpoint, may be present in detail */
+  source?: "system" | "ugc"
+  /** Optional — not currently returned by API, reserved for future use */
+  stats?: {
     timesAnswered: number
     correctRate: number
     avgTimeMs: number
   }
-  createdAt: string
+  createdAt?: string
   updatedAt: string
 }
 
+/** Payload for creating / updating a question */
 export interface QuestionFormData {
-  stem: string
+  stem: { text: string }
+  contentType: QuestionContentType
   correctAnswer: string
   distractors: string[]
   categoryId: string
   difficulty: Difficulty
-  status: QuestionStatus
-  knowledgeCardBasic: string
-  knowledgeCardDeep?: string
-  sourceRef?: string
+  knowledgeCard?: {
+    summary: string
+    deepDive?: string
+    sourceRef?: string
+  }
 }
 
 // ── Import API types (match duoqi-api spec) ──
 
-export type QuestionContentType = "text" | "image" | "video" | "audio"
-
 export interface ImportQuestionItem {
   stem: { text: string }
   contentType: QuestionContentType