diff --git a/css/history_detail/02-layout/layout.css b/css/history_detail/02-layout/layout.css
index 6554686..964aa0e 100644
--- a/css/history_detail/02-layout/layout.css
+++ b/css/history_detail/02-layout/layout.css
@@ -34,7 +34,7 @@ body {
   display: flex;
   gap: 1.5rem; /* 大幅增加间距，更现代 */
   border-bottom: 1px solid var(--color-border-light);
-  margin-bottom: 2.5rem;
+  /* margin-bottom: 2.5rem; */
   padding-bottom: 0;
 }
 
diff --git a/css/history_detail/04-features/markdown-content.css b/css/history_detail/04-features/markdown-content.css
index 92c2aff..1ee8de5 100644
--- a/css/history_detail/04-features/markdown-content.css
+++ b/css/history_detail/04-features/markdown-content.css
@@ -78,7 +78,7 @@ h2 {
 
 .history-export-controls {
   position: relative;
-  margin-bottom: 16px;
+  /* margin-bottom: 16px; */
 }
 
 .export-panel-backdrop {
diff --git a/index.html b/index.html
index b6ef1fa..6185d08 100644
--- a/index.html
+++ b/index.html
@@ -1325,7 +1325,7 @@
 
                 <!-- 处理按钮 -->
                 <div class="flex justify-center mt-8 mb-12">
-                    <button id="processBtn" class="btn-primary-large px-10 py-4 text-lg font-semibold text-white rounded-2xl transition-all disabled:opacity-50 disabled:cursor-not-allowed flex items-center gap-3 hover:scale-[1.02] active:scale-[0.98]" style="background: var(--color-primary);">
+                    <button id="processBtn" class="btn-primary-large px-10 hidden py-4 text-lg font-semibold text-white rounded-2xl transition-all disabled:opacity-50 disabled:cursor-not-allowed flex items-center gap-3 hover:scale-[1.02] active:scale-[0.98]" style="background: var(--color-primary);">
                         <iconify-icon icon="carbon:rocket" width="24"></iconify-icon>
                         <span>开始处理</span>
                     </button>
diff --git a/js/chatbot/ui/chatbot-ui.js b/js/chatbot/ui/chatbot-ui.js
index 3bf8e00..4a54ac5 100644
--- a/js/chatbot/ui/chatbot-ui.js
+++ b/js/chatbot/ui/chatbot-ui.js
@@ -1222,7 +1222,7 @@ function initChatbotUI() {
         </div>
         <!-- 标题栏 (可拖拽移动窗口) -->
         <div id="chatbot-title-bar" class="chatbot-draggable-header" style="padding:12px 24px;display:flex;align-items:center;gap:8px;border-bottom:1px dashed rgba(0,0,0,0.1);flex-shrink:0;">
-          <div style="width:32px;height:32px;border-radius:16px;background:linear-gradient(135deg,#3b82f6,#1d4ed8);display:flex;align-items:center;justify-content:center;">
+          <div style="width:32px;height:32px;border-radius:16px;background:linear-gradient(135deg,#3b82f6,#1d4ed8);display:flex;align-items:center;justify-content:center;display:none;">
             <i class="fa-solid fa-robot" style="font-size: 14px; color: white;"></i>
           </div>
           <span style="font-weight:600;font-size:1.05em;color:#111;">AI 智能助手</span>
diff --git a/js/ui/immersive_layout_logic.js b/js/ui/immersive_layout_logic.js
index cd661da..28fc894 100644
--- a/js/ui/immersive_layout_logic.js
+++ b/js/ui/immersive_layout_logic.js
@@ -734,11 +734,21 @@
           simpleToggleBtn.innerHTML = '<i class="fas fa-eye-slash"></i>';
           simpleToggleBtn.title = '退出简单沉浸模式';
           localStorage.setItem(LS_SIMPLE_IMMERSIVE_KEY, 'true');
+
+          // 自动进入全屏
+          document.documentElement.requestFullscreen().catch(err => {
+            console.warn('无法进入全屏模式:', err);
+          });
         } else {
           // 退出简单沉浸模式
           document.body.classList.remove('simple-immersive-pdf-mode');
           document.body.classList.remove('simple-immersive-pdf-mode');
 
+          // 如果在全屏状态，退出全屏
+          if (document.fullscreenElement) {
+            document.exitFullscreen();
+          }
+
           // 恢复container的padding
           if (mainContainer && mainContainer.dataset.originalPadding !== undefined) {
             mainContainer.style.padding = mainContainer.dataset.originalPadding;
diff --git a/public/pdfjs/web/viewer.css b/public/pdfjs/web/viewer.css
index 2be1ecf..48b4077 100644
--- a/public/pdfjs/web/viewer.css
+++ b/public/pdfjs/web/viewer.css
@@ -2000,7 +2000,7 @@
   --doorhanger-icon-opacity: 0.9;
 
   --main-color: rgba(12, 12, 13, 1);
-  --body-bg-color: rgba(212, 212, 215, 1);
+  --body-bg-color: #f3f4f5;
   --progressBar-color: rgba(10, 132, 255, 1);
   --progressBar-bg-color: rgba(221, 221, 222, 1);
   --progressBar-blend-color: rgba(116, 177, 239, 1);
@@ -2011,7 +2011,7 @@
 
   --sidebar-narrow-bg-color: rgba(212, 212, 215, 0.9);
   --sidebar-toolbar-bg-color: rgba(245, 246, 247, 1);
-  --toolbar-bg-color: rgba(249, 249, 250, 1);
+  --toolbar-bg-color: #ffffff;
   --toolbar-border-color: rgba(184, 184, 184, 1);
   --toolbar-box-shadow: 0 1px 0 var(--toolbar-border-color);
   --toolbar-border-bottom: none;
@@ -2019,7 +2019,7 @@
       rgba(0, 0, 0, 0.25),
     0 1px 0 rgba(0, 0, 0, 0.15), 0 0 1px rgba(0, 0, 0, 0.1);
   --toolbarSidebar-border-bottom: none;
-  --button-hover-color: rgba(221, 222, 223, 1);
+  --button-hover-color: #e6ecfb;
   --toggled-btn-color: rgba(0, 0, 0, 1);
   --toggled-btn-bg-color: rgba(0, 0, 0, 0.3);
   --toggled-hover-active-btn-color: rgba(0, 0, 0, 0.4);
@@ -2308,6 +2308,7 @@ body {
   z-index: 9999;
   cursor: default;
   font: message-box;
+  background-color: var(--toolbar-bg-color);
 }
 
 :is(.toolbar, .editorParamsToolbar, .findbar, #sidebarContainer)
@@ -2345,7 +2346,7 @@ body {
   position: relative;
   height: 32px;
   background-color: var(--toolbar-bg-color);
-  box-shadow: var(--toolbar-box-shadow);
+  /* box-shadow: var(--toolbar-box-shadow); */
   border-bottom: var(--toolbar-border-bottom);
 }
 
@@ -3181,7 +3182,7 @@ a:is(.toolbarButton, .secondaryToolbarButton)[href="#"] {
           user-select: none;
 }
 #thumbnailView {
-  width: calc(100% - 60px);
+  width: 100%;
   padding: 10px 30px 0;
 }
 
diff --git a/public/pdfjs/web/viewer.html b/public/pdfjs/web/viewer.html
index 5763b86..be1294c 100644
--- a/public/pdfjs/web/viewer.html
+++ b/public/pdfjs/web/viewer.html
@@ -29,6 +29,9 @@ See https://github.com/adobe-type-tools/cmap-resources
 
 <!-- This snippet is used in production (included from viewer.html) -->
 <link rel="resource" type="application/l10n" href="locale/locale.properties">
+<!-- 引入tailwindcss -->
+ <link href="https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css" rel="stylesheet">
+
 <script src="../build/pdf.js"></script>
 
     <link rel="stylesheet" href="viewer.css">
@@ -269,19 +272,20 @@ See https://github.com/adobe-type-tools/cmap-resources
                 <span id="numPages" class="toolbarLabel"></span>
               </div>
               <div id="toolbarViewerRight">
-                <button id="openFile" class="toolbarButton hiddenLargeView" title="Open File" tabindex="31" data-l10n-id="open_file">
+                <!-- 直接注释会PDF加载失败 -->
+                <button id="openFile" class="toolbarButton hiddenLargeView hidden" title="Open File" tabindex="31" data-l10n-id="open_file">
                   <span data-l10n-id="open_file_label">Open</span>
                 </button>
 
-                <button id="print" class="toolbarButton hiddenMediumView" title="Print" tabindex="32" data-l10n-id="print">
+                <button id="print" class="toolbarButton hiddenMediumView hidden" title="Print" tabindex="32" data-l10n-id="print">
                   <span data-l10n-id="print_label">Print</span>
                 </button>
 
-                <button id="download" class="toolbarButton hiddenMediumView" title="Save" tabindex="33" data-l10n-id="save">
+                <button id="download" class="toolbarButton hiddenMediumView hidden" title="Save" tabindex="33" data-l10n-id="save">
                   <span data-l10n-id="save_label">Save</span>
                 </button>
 
-                <div class="verticalToolbarSeparator hiddenMediumView"></div>
+                <div class="verticalToolbarSeparator hiddenMediumView hidden"></div>
 
                 <div id="editorModeButtons" class="splitToolbarButton toggled" role="radiogroup">
                   <button id="editorFreeText" class="toolbarButton" disabled="disabled" title="Text" role="radio" aria-checked="false" aria-controls="editorFreeTextParamsToolbar" tabindex="34" data-l10n-id="editor_free_text2">