diff --git a/css/history_detail/02-layout/immersive.css b/css/history_detail/02-layout/immersive.css
index 561a075..5f8c40e 100644
--- a/css/history_detail/02-layout/immersive.css
+++ b/css/history_detail/02-layout/immersive.css
@@ -674,10 +674,7 @@ body.immersive-active #immersive-main-content-area .container {
   flex-direction: column !important;
 }
 
-/* 沉浸模式下显示 PDF 对照按钮（用户要求在沉浸模式中也能使用） */
-body.immersive-active #tab-pdf-compare {
-  display: flex !important;
-}
+/* PDF 对照按钮已隐藏（用户要求页面始终沉浸模式，无需此功能） */
 
 /* Modal 和右键菜单的 z-index 提升 */
 body.immersive-active .modal-overlay {
diff --git a/js/ui/immersive_layout_logic.js b/js/ui/immersive_layout_logic.js
index 28fc894..bc22c41 100644
--- a/js/ui/immersive_layout_logic.js
+++ b/js/ui/immersive_layout_logic.js
@@ -431,127 +431,10 @@
     localStorage.setItem(LS_IMMERSIVE_KEY, 'true');
     document.dispatchEvent(new CustomEvent('immersiveModeEntered'));
   }
+  // 禁用退出沉浸模式功能 - 页面始终保持在沉浸式布局
   function exitImmersiveMode() {
-    reQueryDynamicElements();
-    isImmersiveActive = false;
-
-    // 添加退出动画
-    document.body.classList.add('immersive-exiting');
-    if (immersiveContainer) {
-      immersiveContainer.style.transition = 'opacity 0.3s ease, transform 0.3s ease';
-      immersiveContainer.style.opacity = '0';
-      immersiveContainer.style.transform = 'scale(0.98)';
-    }
-
-    setTimeout(() => {
-      destroyTocDockResizer();
-
-      // Remove the TOC vs Dock resize handle
-      if (tocVsDockResizeHandle && tocVsDockResizeHandle.parentNode === immersiveTocArea) {
-          immersiveTocArea.removeChild(tocVsDockResizeHandle);
-      }
-
-      // 恢复元素位置的逻辑保持不变...
-      if (originalTocPopupParent && tocPopupElement && tocPopupElement.parentNode === immersiveTocArea) {
-        originalTocPopupParent.insertBefore(tocPopupElement, originalTocPopupNextSibling);
-      } else if (tocPopupElement && immersiveTocArea.contains(tocPopupElement)) {
-          immersiveTocArea.removeChild(tocPopupElement);
-          if (originalTocPopupParent) {
-               originalTocPopupParent.insertBefore(tocPopupElement, originalTocPopupNextSibling);
-          }
-      }
-
-      if (originalMainContainerParent && mainPageContainer && mainPageContainer.parentNode === immersiveMainArea) {
-        originalMainContainerParent.insertBefore(mainPageContainer, originalMainContainerNextSibling);
-      } else if (mainPageContainer && immersiveMainArea.contains(mainPageContainer)) {
-          immersiveMainArea.removeChild(mainPageContainer);
-          if (originalMainContainerParent) {
-              originalMainContainerParent.insertBefore(mainPageContainer, originalMainContainerNextSibling);
-          }
-      }
-
-      if (chatbotModalElement && originalChatbotModalParent && chatbotModalElement.parentNode === immersiveChatbotArea) {
-        originalChatbotModalParent.insertBefore(chatbotModalElement, originalChatbotModalNextSibling);
-      } else if (chatbotModalElement && immersiveChatbotArea.contains(chatbotModalElement)) {
-         immersiveChatbotArea.removeChild(chatbotModalElement);
-         if (originalChatbotModalParent) {
-              originalChatbotModalParent.insertBefore(chatbotModalElement, originalChatbotModalNextSibling);
-         }
-      } else if (!chatbotModalElement && originalChatbotModalParent) {
-        immersiveChatbotArea.innerHTML = '';
-      }
-
-      if (dockElement && originalDockElementParent) {
-          if (immersiveDockPlaceholderElement && immersiveDockPlaceholderElement.contains(dockElement)) {
-              immersiveDockPlaceholderElement.removeChild(dockElement);
-          }
-          originalDockElementParent.insertBefore(dockElement, originalDockElementNextSibling);
-      } else if (dockElement && immersiveDockPlaceholderElement && immersiveDockPlaceholderElement.contains(dockElement)){
-          immersiveDockPlaceholderElement.removeChild(dockElement);
-      }
-
-      document.body.classList.remove('immersive-active', 'no-scroll', 'immersive-exiting');
-      if (immersiveContainer) {
-        immersiveContainer.style.display = 'none';
-        immersiveContainer.style.transition = '';
-        immersiveContainer.style.opacity = '';
-        immersiveContainer.style.transform = '';
-      }
-
-      // 清理滚动容器标记 class
-      if (mainPageContainer) {
-        const tabContent = mainPageContainer.querySelector('.tab-content');
-        if (tabContent) {
-          tabContent.classList.remove('js-scroll-container');
-          console.log("[ImmersiveLayout] 已移除 tab-content 的 js-scroll-container 标记");
-        }
-      }
-
-      if (toggleBtn) {
-        toggleBtn.innerHTML = '<i class="fas fa-expand-alt"></i>';
-        toggleBtn.classList.remove('immersive-exit-btn-active');
-        toggleBtn.title = '进入沉浸式布局';
-      }
-
-      // 其他退出逻辑保持不变...
-      if (typeof window.refreshTocList === 'function') {
-        window.refreshTocList();
-      }
-
-      if (typeof window.docIdForLocalStorage !== 'undefined' && window.docIdForLocalStorage) {
-          const savedChatbotOpenState = localStorage.getItem(`chatbotOpenState_${window.docIdForLocalStorage}`);
-          if (savedChatbotOpenState === 'true') {
-              window.isChatbotOpen = true;
-          } else if (savedChatbotOpenState === 'false') {
-              window.isChatbotOpen = false;
-          }
-      }
-
-      if (window.ChatbotUI && typeof window.ChatbotUI.updateChatbotUI === 'function') {
-        window.ChatbotUI.updateChatbotUI();
-      }
-
-      if (window.DockLogic && typeof window.DockLogic.updateStats === 'function' && window.data && window.currentVisibleTabId) {
-          dockElement.style.display = '';
-          window.DockLogic.updateStats(window.data, window.currentVisibleTabId);
-      }
-
-      setTimeout(() => {
-          if (window.DockLogic) {
-              if (typeof window.DockLogic.unbindScrollForCurrentScrollable === 'function') {
-                  console.log("[ImmersiveLayout] 退出沉浸模式前，先解绑旧的滚动事件");
-                  window.DockLogic.unbindScrollForCurrentScrollable();
-              }
-              if (typeof window.DockLogic.forceUpdateReadingProgress === 'function') {
-                  console.log("[ImmersiveLayout] 退出沉浸模式后，延迟调用 forceUpdateReadingProgress");
-                  window.DockLogic.forceUpdateReadingProgress();
-              }
-          }
-      }, 300);
-
-      localStorage.setItem(LS_IMMERSIVE_KEY, 'false');
-      document.dispatchEvent(new CustomEvent('immersiveModeExited'));
-    }, 300);
+    // 已禁用：页面始终保持在沉浸式布局
+    console.log('[ImmersiveLayout] 退出沉浸模式功能已禁用');
   }
 
   function initResizeHandles() {
@@ -637,228 +520,39 @@
 
     reQueryDynamicElements();
 
-    // 标准沉浸模式切换按钮
-    const standardToggleBtn = document.getElementById('toggle-immersive-btn');
-    // 简单沉浸模式切换按钮
-    const simpleToggleBtn = document.getElementById('toggle-simple-immersive-btn');
-
-    // 标准沉浸模式功能
-    if (standardToggleBtn) {
-      standardToggleBtn.addEventListener('click', () => {
-        // 检查是否为移动端设备（屏幕宽度小于等于700px）
-        if (window.innerWidth <= 700) {
-          console.warn('沉浸式布局在移动端（≤700px）不可用');
-          // 可选：显示提示消息
-          if (window.showToast) {
-            window.showToast('沉浸式布局在手机端不可用', 'warning');
-          } else {
-            alert('沉浸式布局在手机端不可用，请在更大的屏幕上使用');
-          }
-          return;
-        }
-
-        if (isImmersiveActive) {
-          exitImmersiveMode();
-        } else {
-          enterImmersiveMode();
-        }
-      });
-    }
-
-    // 简单沉浸模式功能
-    if (simpleToggleBtn) {
-      simpleToggleBtn.addEventListener('click', () => {
-        isSimpleImmersiveActive = !isSimpleImmersiveActive;
-
-        // 检查是否在"原始文件"标签页（PDF查看器）
-        const isOriginalFileTab = window.currentVisibleTabId === 'original-file';
-        const pdfIframeWrapper = document.getElementById('pdf-iframe-wrapper');
-        const pdfIframe = document.getElementById('pdf-viewer-iframe');
-        const mainContainer = document.querySelector('.container');
-
-        if (isSimpleImmersiveActive) {
-          // 如果是PDF查看器标签页，进行特殊处理
-          if (isOriginalFileTab && pdfIframeWrapper && mainContainer) {
-            // 添加特殊类用于PDF全屏模式
-            document.body.classList.add('simple-immersive-pdf-mode');
-
-            // 移除container的padding
-            mainContainer.dataset.originalPadding = mainContainer.style.padding || '';
-            mainContainer.style.padding = '0 !important';
-
-            // 让iframe wrapper充满container（接近全屏）
-            pdfIframeWrapper.style.cssText = `
-              width: 100%;
-              height: calc(100vh - 20px);
-              min-height: calc(100vh - 20px);
-              position: relative;
-              background: #525659;
-            `;
-
-            if (pdfIframe) {
-              pdfIframe.style.cssText = `
-                width: 100%;
-                height: 100%;
-                border: none;
-              `;
-            }
-
-            // 隐藏其他UI元素
-            const elementsToHide = [
-              { selector: '.tabs-container', el: document.querySelector('.tabs-container') },
-              { selector: '.history-export-controls', el: document.querySelector('.history-export-controls') },
-              { selector: '#bottom-left-dock', el: document.getElementById('bottom-left-dock') },
-              { selector: '#toc-popup', el: document.getElementById('toc-popup') },
-              { selector: '#fileName', el: document.getElementById('fileName') },
-              { selector: '#fileMeta', el: document.getElementById('fileMeta') }
-            ];
-
-            elementsToHide.forEach(item => {
-              if (item.el) {
-                item.el.dataset.originalDisplay = item.el.style.display || '';
-                item.el.style.display = 'none';
-              }
-            });
-
-            // 隐藏loading指示器
-            const loading = document.getElementById('pdf-viewer-loading');
-            if (loading) loading.style.display = 'none';
-
-            // 确保iframe显示
-            if (pdfIframe) pdfIframe.style.display = 'block';
-          } else {
-            // 非PDF查看器标签页，使用原有的简单沉浸模式
-            document.body.classList.add('simple-immersive-pdf-mode');
-          }
-
-          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;
-            delete mainContainer.dataset.originalPadding;
-          }
-
-          // 恢复所有被隐藏的元素
-          const elementsToRestore = [
-            { selector: '.tabs-container', el: document.querySelector('.tabs-container') },
-            { selector: '.history-export-controls', el: document.querySelector('.history-export-controls') },
-            { selector: '#bottom-left-dock', el: document.getElementById('bottom-left-dock') },
-            { selector: '#toc-popup', el: document.getElementById('toc-popup') },
-            { selector: '#fileName', el: document.getElementById('fileName') },
-            { selector: '#fileMeta', el: document.getElementById('fileMeta') }
-          ];
-
-          elementsToRestore.forEach(item => {
-            if (item.el && item.el.dataset.originalDisplay !== undefined) {
-              item.el.style.display = item.el.dataset.originalDisplay;
-              delete item.el.dataset.originalDisplay;
-            }
-          });
-
-          // 恢复iframe wrapper的原始样式
-          if (pdfIframeWrapper) {
-            pdfIframeWrapper.style.cssText = `
-              width: 100%;
-              height: 100%;
-              min-height: 500px;
-              position: relative;
-              background: #525659;
-            `;
-          }
-
-          simpleToggleBtn.innerHTML = '<i class="fas fa-eye"></i>';
-          simpleToggleBtn.title = '进入简单沉浸模式';
-          localStorage.setItem(LS_SIMPLE_IMMERSIVE_KEY, 'false');
-        }
-      });
-    }
+    // 按钮已隐藏，退出功能已禁用，页面始终处于沉浸模式
+    // 不再需要按钮事件监听器
 
     initResizeHandles();
 
-    // 监听窗口大小变化，如果变成移动端尺寸则自动退出沉浸模式
-    function handleWindowResize() {
-      if (window.innerWidth <= 700 && isImmersiveActive) {
-        console.log('检测到屏幕缩小到移动端尺寸，自动退出沉浸式布局');
-        exitImmersiveMode();
-      }
-    }
+    // 禁用：窗口大小变化时不再自动退出沉浸模式
+    // function handleWindowResize() {
+    //   if (window.innerWidth <= 700 && isImmersiveActive) {
+    //     console.log('检测到屏幕缩小到移动端尺寸，自动退出沉浸式布局');
+    //     exitImmersiveMode();
+    //   }
+    // }
+    // window.addEventListener('resize', handleWindowResize);
 
-    // 添加窗口大小变化监听器
-    window.addEventListener('resize', handleWindowResize);
+    // 强制始终进入沉浸模式（忽略 localStorage 状态）
+    // 页面默认沉浸式布局，且无法退出
+    const shouldEnterImmersive = true;
 
-    // Restore immersive state from localStorage
-    const savedImmersiveState = localStorage.getItem(LS_IMMERSIVE_KEY);
+    console.log('[ImmersiveLayout] 强制进入沉浸模式');
 
-    // 历史详情页默认进入沉浸模式，只有用户明确退出过才不进入
-    // 注意：null 表示首次访问，'true' 表示用户之前处于沉浸模式
-    // 只有 'false' 才表示用户主动退出过沉浸模式
-    const shouldEnterImmersive = savedImmersiveState !== 'false';
-
-    console.log('[ImmersiveLayout] savedImmersiveState:', savedImmersiveState, 'shouldEnterImmersive:', shouldEnterImmersive);
-
-    if (shouldEnterImmersive) {
-      // 检查是否为移动端，如果是则不恢复沉浸模式
-      if (window.innerWidth <= 700) {
-        console.log('检测到移动端设备，不进入沉浸式布局');
-        localStorage.setItem(LS_IMMERSIVE_KEY, 'false');
-        // 显示页面
-        document.documentElement.classList.remove('immersive-pending');
-        document.documentElement.classList.add('immersive-ready');
-        document.body.classList.remove('immersive-pending');
-        document.body.classList.add('immersive-ready');
-      } else {
-        // 立即进入沉浸模式（静默模式，无动画）
-        console.log('[ImmersiveLayout] 准备进入沉浸模式, isImmersiveActive:', isImmersiveActive);
-        enterImmersiveMode({ silent: true });
-        console.log('[ImmersiveLayout] enterImmersiveMode 调用完成, isImmersiveActive:', isImmersiveActive);
-      }
-    } else {
-      // 不需要沉浸模式，直接显示页面
+    // 检查是否为移动端，如果是则不进入沉浸模式
+    if (window.innerWidth <= 700) {
+      console.log('检测到移动端设备，不进入沉浸式布局');
+      // 显示页面
       document.documentElement.classList.remove('immersive-pending');
       document.documentElement.classList.add('immersive-ready');
       document.body.classList.remove('immersive-pending');
       document.body.classList.add('immersive-ready');
-    }
-
-    // Restore simple immersive state from localStorage
-    const savedSimpleImmersiveState = localStorage.getItem(LS_SIMPLE_IMMERSIVE_KEY);
-    if (savedSimpleImmersiveState === 'true') {
-      // 检查是否为移动端，如果是则不启用简单沉浸模式
-      if (window.innerWidth <= 700) {
-        console.log('检测到移动端设备，不启用简单沉浸式布局状态');
-        localStorage.setItem(LS_SIMPLE_IMMERSIVE_KEY, 'false'); // 清除保存的状态
-      } else {
-        // 如果不在标准沉浸模式下，才启用简单沉浸模式
-        if (!isImmersiveActive) {
-          setTimeout(() => {
-            if (!isSimpleImmersiveActive) {
-              document.body.classList.add('simple-immersive-pdf-mode');
-              isSimpleImmersiveActive = true;
-              if (toggleBtn) {
-                toggleBtn.innerHTML = '<i class="fas fa-compress-alt"></i>';
-                toggleBtn.title = '退出简单沉浸模式';
-              }
-            }
-          }, 200);
-        }
-      }
+    } else {
+      // 立即进入沉浸模式（静默模式，无动画）
+      console.log('[ImmersiveLayout] 准备进入沉浸模式, isImmersiveActive:', isImmersiveActive);
+      enterImmersiveMode({ silent: true });
+      console.log('[ImmersiveLayout] enterImmersiveMode 调用完成, isImmersiveActive:', isImmersiveActive);
     }
 
     console.log('Immersive layout logic initialized.');
diff --git a/views/history/history_detail.html b/views/history/history_detail.html
index 79f186c..962dcf0 100644
--- a/views/history/history_detail.html
+++ b/views/history/history_detail.html
@@ -111,7 +111,7 @@
     </button>
 
     <!-- Simple Immersive Mode Toggle Button -->
-    <button id="toggle-simple-immersive-btn" class="tiny-round-btn" style="top: 70px !important;" title="进入简单沉浸模式">
+    <button id="toggle-simple-immersive-btn" class="tiny-round-btn hidden" style="display: none;" title="进入简单沉浸模式">
       <i class="fas fa-eye"></i>
       <!-- Icon for simple immersive mode -->
     </button>