diff --git a/web-to-ppt/background.js b/web-to-ppt/background.js
index fc8e77b..43e1600 100644
--- a/web-to-ppt/background.js
+++ b/web-to-ppt/background.js
@@ -1,6 +1,6 @@
 const CAPTURE_FILE = "capture.js";
 const RUNNER_FILE = "runner.js";
-const SETTINGS_KEY = "webToPPTSettings";
+const SETTINGS_KEY = "webToPixsoSettings";
 const DEFAULT_SETTINGS = {
   useProxy: false,
   concurrency: "8",
@@ -10,7 +10,6 @@ const DEFAULT_SETTINGS = {
 const MIN_CAPTURE_WIDTH = 320;
 const MAX_CAPTURE_WIDTH = 3840;
 
-// 缓存最近一次采集数据，供 popup 获取
 let lastCaptureData = null;
 
 const delay = ms => new Promise(resolve => setTimeout(resolve, ms));
@@ -56,22 +55,14 @@ async function getActiveTab() {
 }
 
 async function runCapture(tabId, options) {
-  await chrome.scripting.executeScript({
-    target: { tabId },
-    files: [CAPTURE_FILE]
-  });
-  await chrome.scripting.executeScript({
-    target: { tabId },
-    files: [RUNNER_FILE]
-  });
+  await chrome.scripting.executeScript({ target: { tabId }, files: [CAPTURE_FILE] });
+  await chrome.scripting.executeScript({ target: { tabId }, files: [RUNNER_FILE] });
   const [{ result }] = await chrome.scripting.executeScript({
     target: { tabId },
     func: captureOptions => window.__webToPPTRunCapture(captureOptions),
     args: [options]
   });
-  if (!result) {
-    throw new Error("页面没有返回采集结果");
-  }
+  if (!result) throw new Error("页面没有返回采集结果");
   return result;
 }
 
@@ -82,9 +73,7 @@ async function getTabViewportWidth(tabId) {
       func: () => Math.round(window.innerWidth || document.documentElement.clientWidth || 0)
     });
     return normalizeCaptureWidth(result, null);
-  } catch {
-    return null;
-  }
+  } catch { return null; }
 }
 
 async function prepareCaptureViewport(tab, requestedWidth) {
@@ -92,52 +81,25 @@ async function prepareCaptureViewport(tab, requestedWidth) {
   const beforeViewportWidth = await getTabViewportWidth(tab.id);
   const noop = async () => {};
   if (!targetWidth || !beforeViewportWidth || Math.abs(beforeViewportWidth - targetWidth) <= 2) {
-    return {
-      restore: noop,
-      requestedWidth: targetWidth || beforeViewportWidth,
-      beforeViewportWidth,
-      actualViewportWidth: beforeViewportWidth,
-      resizedWindow: false
-    };
+    return { restore: noop, requestedWidth: targetWidth || beforeViewportWidth, beforeViewportWidth, actualViewportWidth: beforeViewportWidth, resizedWindow: false };
   }
-
   if (!tab.windowId || !chrome.windows?.get || !chrome.windows?.update) {
     throw new Error("当前浏览器不支持临时调整采集视口宽度");
   }
-
   const originalWindow = await chrome.windows.get(tab.windowId);
   const originalState = originalWindow.state || "normal";
-  const originalBounds = {
-    left: originalWindow.left,
-    top: originalWindow.top,
-    width: originalWindow.width,
-    height: originalWindow.height
-  };
-
+  const originalBounds = { left: originalWindow.left, top: originalWindow.top, width: originalWindow.width, height: originalWindow.height };
   const restore = async () => {
     try {
-      if (originalState !== "normal") {
-        await chrome.windows.update(tab.windowId, { state: "normal" });
-        await delay(120);
-      }
+      if (originalState !== "normal") { await chrome.windows.update(tab.windowId, { state: "normal" }); await delay(120); }
       const restoreBounds = definedWindowBounds(originalBounds);
-      if (Object.keys(restoreBounds).length) {
-        await chrome.windows.update(tab.windowId, restoreBounds);
-      }
-      if (originalState !== "normal") {
-        await delay(120);
-        await chrome.windows.update(tab.windowId, { state: originalState });
-      }
+      if (Object.keys(restoreBounds).length) await chrome.windows.update(tab.windowId, restoreBounds);
+      if (originalState !== "normal") { await delay(120); await chrome.windows.update(tab.windowId, { state: originalState }); }
       await delay(250);
     } catch {}
   };
-
   try {
-    if (originalState !== "normal") {
-      await chrome.windows.update(tab.windowId, { state: "normal" });
-      await delay(250);
-    }
-
+    if (originalState !== "normal") { await chrome.windows.update(tab.windowId, { state: "normal" }); await delay(250); }
     let currentViewportWidth = beforeViewportWidth;
     let currentWindow = await chrome.windows.get(tab.windowId);
     for (let attempt = 0; attempt < 2; attempt += 1) {
@@ -149,63 +111,18 @@ async function prepareCaptureViewport(tab, requestedWidth) {
       if (Math.abs(currentViewportWidth - targetWidth) <= 2) break;
       currentWindow = await chrome.windows.get(tab.windowId);
     }
-
-    if (Math.abs(currentViewportWidth - targetWidth) > 2) {
-      throw new Error(`采集视口未生效：目标 ${targetWidth}px，实际 ${currentViewportWidth}px`);
-    }
-
-    return {
-      restore,
-      requestedWidth: targetWidth,
-      beforeViewportWidth,
-      actualViewportWidth: currentViewportWidth,
-      resizedWindow: true
-    };
-  } catch (error) {
-    await restore();
-    throw error;
-  }
+    if (Math.abs(currentViewportWidth - targetWidth) > 2) throw new Error(`采集视口未生效：目标 ${targetWidth}px，实际 ${currentViewportWidth}px`);
+    return { restore, requestedWidth: targetWidth, beforeViewportWidth, actualViewportWidth: currentViewportWidth, resizedWindow: true };
+  } catch (error) { await restore(); throw error; }
 }
 
 async function captureCurrentTab(tab, settings) {
   const viewport = await prepareCaptureViewport(tab, settings.captureWidth);
   try {
-    const data = await runCapture(tab.id, {
-      ...settings,
-      captureWidth: viewport.requestedWidth
-    });
-    data.capture = {
-      ...(data.capture || {}),
-      resizedWindow: viewport.resizedWindow,
-      usedTemporaryWindow: viewport.resizedWindow,
-      requestedWidth: viewport.requestedWidth || data.source?.actualViewportWidth || data.canvas?.width,
-      beforeViewportWidth: viewport.beforeViewportWidth,
-      actualViewportWidth: data.source?.actualViewportWidth || viewport.actualViewportWidth
-    };
+    const data = await runCapture(tab.id, { ...settings, captureWidth: viewport.requestedWidth });
+    data.capture = { ...(data.capture || {}), resizedWindow: viewport.resizedWindow, usedTemporaryWindow: viewport.resizedWindow, requestedWidth: viewport.requestedWidth || data.source?.actualViewportWidth || data.canvas?.width, beforeViewportWidth: viewport.beforeViewportWidth, actualViewportWidth: data.source?.actualViewportWidth || viewport.actualViewportWidth };
     return data;
-  } finally {
-    await viewport.restore();
-  }
-}
-
-async function downloadCapture(data) {
-  const json = JSON.stringify(data, null, 2);
-  const encodedJson = arrayBufferToBase64(new TextEncoder().encode(json));
-  const url = `data:application/json;charset=utf-8;base64,${encodedJson}`;
-  const title = data.source?.title || "webpage";
-  const safeTitle = title
-    .replace(/[\\/:*?"<>|]+/g, "-")
-    .replace(/\s+/g, "-")
-    .slice(0, 64) || "webpage";
-  const filename = `web-to-ppt/${safeTitle}-${Date.now()}.json`;
-
-  await chrome.downloads.download({
-    url,
-    filename,
-    saveAs: true
-  });
-
-  return filename;
+  } finally { await viewport.restore(); }
 }
 
 function arrayBufferToBase64(buffer) {
@@ -220,7 +137,7 @@ function arrayBufferToBase64(buffer) {
 
 // 消息处理
 chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
-  // 采集并缓存数据（不下载 JSON，由 popup 直接转化下载 PPTX）
+  // 采集并缓存数据
   if (message?.type === "WEB_TO_PPT_CAPTURE_START") {
     (async () => {
       const settings = normalizeSettings(message.options);
@@ -228,24 +145,19 @@ chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
       const tab = sender?.tab || await getActiveTab();
       assertCaptureableTab(tab);
       const data = await captureCurrentTab(tab, settings);
-      lastCaptureData = data; // 缓存数据
-      return {
-        ok: true,
-        actualViewportWidth: data.source?.actualViewportWidth,
-        requestedViewportWidth: data.source?.requestedViewportWidth
-      };
+      lastCaptureData = data;
+      return { ok: true, actualViewportWidth: data.source?.actualViewportWidth };
     })()
       .then(sendResponse)
       .catch(error => sendResponse({ ok: false, error: error.message || String(error) }));
     return true;
   }
 
-  // 获取最近一次采集数据（供 popup 转化用）
+  // 获取缓存数据
   if (message?.type === "WEB_TO_PPT_GET_DATA") {
     if (lastCaptureData) {
       sendResponse({ ok: true, data: lastCaptureData });
     } else {
-      // 如果没有缓存，重新采集
       (async () => {
         const settings = normalizeSettings({});
         const tab = await getActiveTab();
@@ -259,7 +171,7 @@ chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
     return true;
   }
 
-  // 下载 PPTX（由 popup 调用，background 执行下载）
+  // 下载 PPTX（base64 data URL）
   if (message?.type === "WEB_TO_PPT_DOWNLOAD") {
     (async () => {
       const dataUrl = 'data:application/vnd.openxmlformats-officedocument.presentationml.presentation;base64,' + message.base64;
@@ -274,11 +186,8 @@ chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
   return false;
 });
 
-// 安装时初始化设置
 chrome.runtime.onInstalled.addListener(() => {
   chrome.storage.local.get({ [SETTINGS_KEY]: DEFAULT_SETTINGS }).then(result => {
     chrome.storage.local.set({ [SETTINGS_KEY]: normalizeSettings(result[SETTINGS_KEY]) });
   });
 });
-
-// 点击图标打开 popup（MV3 默认行为）