diff --git a/components.d.ts b/components.d.ts
index 966f513..f1b6e92 100644
--- a/components.d.ts
+++ b/components.d.ts
@@ -31,7 +31,6 @@ declare module 'vue' {
     NGi: typeof import('naive-ui')['NGi']
     NGrid: typeof import('naive-ui')['NGrid']
     NInput: typeof import('naive-ui')['NInput']
-    NInputNumber: typeof import('naive-ui')['NInputNumber']
     NMessageProvider: typeof import('naive-ui')['NMessageProvider']
     NModal: typeof import('naive-ui')['NModal']
     NModalProvider: typeof import('naive-ui')['NModalProvider']
@@ -40,7 +39,6 @@ declare module 'vue' {
     NRate: typeof import('naive-ui')['NRate']
     NSpin: typeof import('naive-ui')['NSpin']
     NSplit: typeof import('naive-ui')['NSplit']
-    NSwitch: typeof import('naive-ui')['NSwitch']
     NTab: typeof import('naive-ui')['NTab']
     NTabPane: typeof import('naive-ui')['NTabPane']
     NTabs: typeof import('naive-ui')['NTabs']
diff --git a/src/components/Preview.vue b/src/components/Preview.vue
index 36e8090..ce9fe5a 100644
--- a/src/components/Preview.vue
+++ b/src/components/Preview.vue
@@ -4,6 +4,8 @@
     <n-flex>
       <n-button quaternary @click="download" :disabled="!showDL">下载</n-button>
       <n-button quaternary @click="open">全屏</n-button>
+      <n-button quaternary v-if="props.clearable" @click="clear">清空</n-button>
+      <n-button quaternary v-if="props.showCodeButton" @click="emits('showCode')">查看代码</n-button>
       <n-button quaternary v-if="props.submissionId" @click="copyLink">
         复制链接
       </n-button>
@@ -35,10 +37,12 @@ interface Props {
   css: string
   js: string
   submissionId?: string
+  showCodeButton?: boolean
+  clearable?: boolean
 }
 
 const props = defineProps<Props>()
-const emits = defineEmits(["afterScore", "showCode"])
+const emits = defineEmits(["afterScore", "showCode", "clear"])
 
 const message = useMessage()
 const router = useRouter()
@@ -101,6 +105,10 @@ function open() {
   }
 }
 
+function clear() {
+  emits("clear")
+}
+
 function copyLink() {
   copy(`${document.location.origin}/submission/${props.submissionId}`)
   message.success("该提交的链接已复制")
diff --git a/src/components/PromptPanel.vue b/src/components/PromptPanel.vue
index 64b8f32..79b2717 100644
--- a/src/components/PromptPanel.vue
+++ b/src/components/PromptPanel.vue
@@ -61,8 +61,7 @@ const renderer = new Renderer()
 renderer.code = function ({ text, lang }: { text: string; lang?: string }) {
   const escape = (s: string) =>
     s.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;")
-  const label = lang ? `查看代码（${escape(lang)}）` : "查看代码"
-  return `<details class="code-block"><summary>${label}</summary><pre><code class="hljs${lang ? ` language-${escape(lang)}` : ""}">${escape(text)}</code></pre></details>`
+  return `<pre><code class="hljs${lang ? ` language-${escape(lang)}` : ""}">${text}</code></pre>`
 }
 
 function renderMarkdown(text: string): string {
@@ -137,29 +136,4 @@ watch(
   border-top: 1px solid #e0e0e0;
 }
 
-.message-content :deep(details.code-block) {
-  border: 1px solid #e0e0e0;
-  border-radius: 4px;
-  margin: 6px 0;
-}
-
-.message-content :deep(details.code-block summary) {
-  padding: 4px 10px;
-  cursor: pointer;
-  font-size: 12px;
-  color: #666;
-  user-select: none;
-  background: #f5f5f5;
-  border-radius: 4px;
-}
-
-.message-content :deep(details.code-block[open] summary) {
-  border-bottom: 1px solid #e0e0e0;
-  border-radius: 4px 4px 0 0;
-}
-
-.message-content :deep(details.code-block pre) {
-  margin: 0;
-  border-radius: 0 0 4px 4px;
-}
 </style>
diff --git a/src/pages/ChallengeHome.vue b/src/pages/ChallengeHome.vue
index 8b81626..6df196b 100644
--- a/src/pages/ChallengeHome.vue
+++ b/src/pages/ChallengeHome.vue
@@ -19,18 +19,7 @@
     </template>
     <template #2>
       <div class="right-panel">
-        <Preview :html="html" :css="css" :js="js" />
-        <n-flex class="toolbar" align="center" :size="8">
-          <n-button secondary @click="showCode = true">查看代码</n-button>
-          <n-button
-            type="primary"
-            :disabled="!conversationId"
-            :loading="submitLoading"
-            @click="submit"
-          >
-            提交作品
-          </n-button>
-        </n-flex>
+        <Preview :html="html" :css="css" :js="js" show-code-button clearable @showCode="showCode = true" @clear="clearAll" />
       </div>
     </template>
   </n-split>
@@ -52,7 +41,6 @@
 <script setup lang="ts">
 import { ref, watch, onMounted, onUnmounted } from "vue"
 import { useRoute, useRouter } from "vue-router"
-import { useMessage } from "naive-ui"
 import { Icon } from "@iconify/vue"
 import { marked } from "marked"
 import PromptPanel from "../components/PromptPanel.vue"
@@ -60,18 +48,16 @@ import Preview from "../components/Preview.vue"
 import { Challenge, Submission } from "../api"
 import { html, css, js } from "../store/editors"
 import { taskId } from "../store/task"
-import { connectPrompt, disconnectPrompt, conversationId, streaming, onCodeComplete } from "../store/prompt"
+import { connectPrompt, disconnectPrompt, conversationId, streaming, setOnCodeComplete } from "../store/prompt"
 
 const route = useRoute()
 const router = useRouter()
-const message = useMessage()
 
 const leftSize = ref(0.4)
 const activeTab = ref("desc")
 const challengeTitle = ref("")
 const challengeContent = ref("")
 const showCode = ref(false)
-const submitLoading = ref(false)
 
 watch(streaming, (val) => {
   if (val) activeTab.value = "chat"
@@ -84,7 +70,7 @@ async function loadChallenge() {
   challengeTitle.value = `#${data.display} ${data.title}`
   challengeContent.value = await marked.parse(data.content, { async: true })
   connectPrompt(data.task_ptr)
-  onCodeComplete = async (code) => {
+  setOnCodeComplete(async (code) => {
     if (!conversationId.value) return
     try {
       await Submission.create(taskId.value, {
@@ -96,7 +82,13 @@ async function loadChallenge() {
     } catch {
       // 静默失败，不打扰用户
     }
-  }
+  })
+}
+
+function clearAll() {
+  html.value = ""
+  css.value = ""
+  js.value = ""
 }
 
 function back() {
@@ -104,24 +96,6 @@ function back() {
   router.push({ name: "home-challenge-list" })
 }
 
-async function submit() {
-  if (!conversationId.value) return
-  submitLoading.value = true
-  try {
-    await Submission.create(taskId.value, {
-      html: html.value,
-      css: css.value,
-      js: js.value,
-      conversationId: conversationId.value,
-    })
-    message.success("提交成功")
-  } catch {
-    message.error("提交失败")
-  } finally {
-    submitLoading.value = false
-  }
-}
-
 onMounted(loadChallenge)
 onUnmounted(disconnectPrompt)
 </script>
@@ -153,10 +127,4 @@ onUnmounted(disconnectPrompt)
   display: flex;
   flex-direction: column;
 }
-
-.toolbar {
-  padding: 8px 12px;
-  border-top: 1px solid #e0e0e0;
-  justify-content: flex-end;
-}
 </style>
diff --git a/src/pages/Submissions.vue b/src/pages/Submissions.vue
index 1237802..c534576 100644
--- a/src/pages/Submissions.vue
+++ b/src/pages/Submissions.vue
@@ -63,22 +63,58 @@
       </n-tab-pane>
     </n-tabs>
   </n-modal>
-  <n-modal v-model:show="chainModal" preset="card" title="Prompt 思维链" style="max-width: 60%; max-height: 80vh">
+  <n-modal v-model:show="chainModal" preset="card" title="提示词" style="width: 90vw; max-width: 1400px">
     <n-spin :show="chainLoading">
-      <div v-for="msg in chainMessages" :key="msg.id" style="margin-bottom: 16px">
-        <div :style="{ fontWeight: 'bold', fontSize: '12px', marginBottom: '4px', color: msg.role === 'user' ? '#2080f0' : '#18a058' }">
-          {{ msg.role === "user" ? "学生" : "AI" }}
+      <n-empty v-if="!chainLoading && chainRounds.length === 0" description="暂无对话记录" />
+      <div v-else style="display: grid; grid-template-columns: 1fr 1fr; gap: 16px; height: 75vh">
+        <!-- 左侧：学生提问列表 -->
+        <div style="overflow-y: auto; padding-right: 8px; border-right: 1px solid #e0e0e0; display: flex; flex-direction: column; gap: 8px">
+          <div
+            v-for="(round, index) in chainRounds"
+            :key="index"
+            style="display: flex; gap: 10px; align-items: flex-start; cursor: pointer"
+            @click="selectedRound = index"
+          >
+            <div :style="{
+              flexShrink: 0, width: '22px', height: '22px', borderRadius: '50%',
+              background: selectedRound === index ? '#2080f0' : '#c2d5fb',
+              color: '#fff', fontSize: '12px', fontWeight: 'bold',
+              display: 'flex', alignItems: 'center', justifyContent: 'center', marginTop: '2px',
+              transition: 'background 0.2s',
+            }">
+              {{ index + 1 }}
+            </div>
+            <div :style="{
+              flex: 1, padding: '10px 14px', borderRadius: '8px',
+              background: selectedRound === index ? '#e8f0fe' : '#f5f5f5',
+              border: selectedRound === index ? '1px solid #2080f0' : '1px solid #e0e0e0',
+              fontSize: '13px', lineHeight: '1.6', transition: 'all 0.2s',
+            }">
+              {{ round.question }}
+            </div>
+          </div>
+        </div>
+        <!-- 右侧：对应网页预览 -->
+        <div style="display: flex; flex-direction: column; gap: 8px">
+          <div style="font-weight: bold; font-size: 13px; color: #555">
+            第 {{ selectedRound + 1 }} 轮网页
+          </div>
+          <iframe
+            v-if="selectedPageHtml"
+            :srcdoc="selectedPageHtml"
+            :key="selectedRound"
+            sandbox="allow-scripts"
+            style="flex: 1; border: 1px solid #e0e0e0; border-radius: 6px; background: #fff"
+          />
+          <n-empty v-else description="该轮无网页代码" style="margin: auto" />
         </div>
-        <div v-html="renderMarkdown(msg.content)" style="font-size: 14px; line-height: 1.6" />
       </div>
-      <n-empty v-if="!chainLoading && chainMessages.length === 0" description="暂无对话记录" />
     </n-spin>
   </n-modal>
 </template>
 <script setup lang="ts">
 import { NButton, type DataTableColumn } from "naive-ui"
 import { computed, h, onMounted, onUnmounted, reactive, ref, watch } from "vue"
-import { marked } from "marked"
 import { Submission, Prompt } from "../api"
 import type { SubmissionOut } from "../utils/type"
 import { parseTime } from "../utils/helper"
@@ -109,23 +145,51 @@ const js = computed(() => submission.value.js)
 
 const codeModal = ref(false)
 const chainModal = ref(false)
-const chainMessages = ref<{ id: number; role: string; content: string }[]>([])
+const chainMessages = ref<{ id: number; role: string; content: string; code_html: string | null; code_css: string | null; code_js: string | null }[]>([])
 const chainLoading = ref(false)
+const selectedRound = ref(0)
+
+const chainRounds = computed(() => {
+  const messages = chainMessages.value
+  const rounds: { question: string; html: string | null; css: string | null; js: string | null }[] = []
+  for (let i = 0; i < messages.length; i++) {
+    if (messages[i].role !== "user") continue
+    let html = null, css = null, js = null
+    for (let j = i + 1; j < messages.length; j++) {
+      if (messages[j].role === "user") break
+      if (messages[j].role === "assistant" && messages[j].code_html) {
+        html = messages[j].code_html
+        css = messages[j].code_css
+        js = messages[j].code_js
+        break
+      }
+    }
+    rounds.push({ question: messages[i].content, html, css, js })
+  }
+  return rounds
+})
+
+const selectedPageHtml = computed(() => {
+  const round = chainRounds.value[selectedRound.value]
+  if (!round?.html) return null
+  const style = round.css ? `<style>${round.css}</style>` : ""
+  const script = round.js ? `<script>${round.js}<\/script>` : ""
+  return `<!DOCTYPE html><html><head><meta charset="utf-8">${style}</head><body>${round.html}${script}</body></html>`
+})
 
 async function showChain(conversationId: string) {
   chainLoading.value = true
   chainModal.value = true
+  selectedRound.value = 0
   try {
     chainMessages.value = await Prompt.getMessages(conversationId)
+    const last = chainRounds.value.length - 1
+    if (last >= 0) selectedRound.value = last
   } finally {
     chainLoading.value = false
   }
 }
 
-function renderMarkdown(text: string): string {
-  return marked.parse(text, { async: false }) as string
-}
-
 const columns: DataTableColumn<SubmissionOut>[] = [
   {
     title: "时间",
@@ -161,7 +225,7 @@ const columns: DataTableColumn<SubmissionOut>[] = [
     },
   },
   {
-    title: "思维链",
+    title: "提示词",
     key: "conversation_id",
     width: 70,
     render: (row) => {
diff --git a/src/store/prompt.ts b/src/store/prompt.ts
index cf74621..0842bb7 100644
--- a/src/store/prompt.ts
+++ b/src/store/prompt.ts
@@ -14,7 +14,11 @@ export const conversationId = ref<string>("")
 export const connected = ref(false)
 export const streaming = ref(false)
 export const streamingContent = ref("")
-export let onCodeComplete: ((code: { html: string | null; css: string | null; js: string | null }) => void) | null = null
+let _onCodeComplete: ((code: { html: string | null; css: string | null; js: string | null }) => void) | null = null
+
+export function setOnCodeComplete(fn: typeof _onCodeComplete) {
+  _onCodeComplete = fn
+}
 
 let ws: WebSocket | null = null
 
@@ -55,8 +59,8 @@ export function connectPrompt(taskId: number) {
       // Apply code to editors
       if (data.code) {
         applyCode(data.code)
-        if (onCodeComplete) {
-          onCodeComplete(data.code)
+        if (_onCodeComplete) {
+          _onCodeComplete(data.code)
         }
       }
     } else if (data.type === "error") {
@@ -84,7 +88,7 @@ export function disconnectPrompt() {
   connected.value = false
   streaming.value = false
   streamingContent.value = ""
-  onCodeComplete = null
+  _onCodeComplete = null
 }
 
 export function sendPrompt(content: string) {