diff --git a/src/App.tsx b/src/App.tsx
index 55bb376..b8637d5 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -366,7 +366,14 @@ function MainContent(): React.JSX.Element {
     >
       {contextHolder}
       <Layout style={{ height: "100%", flexDirection: "row", overflow: "hidden" }}>
-        {!immersiveMode && (
+        <div
+          className={`ss-immersive-sidebar ${immersiveMode ? "is-hidden" : "is-visible"}`}
+          style={
+            {
+              "--ss-sidebar-width": `${sidebarCollapsed ? 64 : 200}px`,
+            } as React.CSSProperties
+          }
+        >
           <Sidebar
             activeMenu={activeMenu}
             permission={permission}
@@ -376,7 +383,7 @@ function MainContent(): React.JSX.Element {
             floatingExpanded={floatingSidebarExpanded}
             onFloatingExpandedChange={setFloatingSidebarExpanded}
           />
-        )}
+        </div>
         <ContentArea
           permission={permission}
           hasAnyPassword={hasAnyPassword}
diff --git a/src/assets/main.css b/src/assets/main.css
index 8b85e9a..c889ddc 100644
--- a/src/assets/main.css
+++ b/src/assets/main.css
@@ -225,3 +225,54 @@ html.platform-macos #root {
 .ss-group-board-modal .ant-modal-body {
   overflow: hidden;
 }
+
+.ss-immersive-sidebar {
+  --ss-sidebar-width: 200px;
+  height: 100%;
+  display: flex;
+  flex-shrink: 0;
+  width: var(--ss-sidebar-width);
+  overflow: hidden;
+  background: var(--ss-sidebar-bg);
+  opacity: 1;
+  transform: translateX(0);
+  transition:
+    width 260ms cubic-bezier(0.22, 1, 0.36, 1),
+    opacity 220ms ease,
+    transform 260ms cubic-bezier(0.22, 1, 0.36, 1);
+  will-change: width, opacity, transform;
+}
+
+.ss-immersive-sidebar .ant-layout-sider {
+  height: 100% !important;
+}
+
+.ss-immersive-sidebar.is-hidden {
+  width: 0;
+  opacity: 0;
+  transform: translateX(-10px);
+  pointer-events: none;
+}
+
+.ss-immersive-toolbar {
+  opacity: 1;
+  transform: translateX(-50%) translateY(0) scale(1);
+  transition:
+    width 420ms cubic-bezier(0.2, 1.2, 0.26, 1),
+    opacity 200ms ease,
+    transform 320ms cubic-bezier(0.2, 1.2, 0.26, 1);
+  will-change: width, opacity, transform;
+}
+
+.ss-immersive-toolbar.is-hidden {
+  opacity: 0;
+  transform: translateX(-50%) translateY(16px) scale(0.98);
+  pointer-events: none;
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .ss-immersive-sidebar,
+  .ss-immersive-toolbar {
+    transition: none !important;
+  }
+}
diff --git a/src/components/Home.tsx b/src/components/Home.tsx
index 0cd52af..a6a1a99 100644
--- a/src/components/Home.tsx
+++ b/src/components/Home.tsx
@@ -117,6 +117,9 @@ export const Home: React.FC<HomeProps> = ({
   const scrollContainerRef = useRef<HTMLDivElement>(null)
   const groupRefs = useRef<Record<string, HTMLDivElement | null>>({})
   const searchAreaRef = useRef<HTMLDivElement>(null)
+  const immersiveToolbarRef = useRef<HTMLDivElement>(null)
+  const immersiveToolbarContentRef = useRef<HTMLDivElement>(null)
+  const [immersiveToolbarWidth, setImmersiveToolbarWidth] = useState<number | null>(null)
 
   const [selectedStudent, setSelectedStudent] = useState<student | null>(null)
   const [batchMode, setBatchMode] = useState(false)
@@ -320,6 +323,33 @@ export const Home: React.FC<HomeProps> = ({
     return () => document.removeEventListener("mousedown", onDocumentClick)
   }, [])
 
+  useEffect(() => {
+    if (!immersiveMode) return
+    const contentEl = immersiveToolbarContentRef.current
+    if (!contentEl) return
+
+    let frameId: number | null = null
+    const updateToolbarWidth = () => {
+      if (frameId !== null) cancelAnimationFrame(frameId)
+      frameId = requestAnimationFrame(() => {
+        const contentWidth = Math.ceil(contentEl.getBoundingClientRect().width)
+        const nextWidth = contentWidth + 20
+        setImmersiveToolbarWidth((prev) => (prev === nextWidth ? prev : nextWidth))
+      })
+    }
+
+    updateToolbarWidth()
+    const observer = new ResizeObserver(updateToolbarWidth)
+    observer.observe(contentEl)
+    window.addEventListener("resize", updateToolbarWidth)
+
+    return () => {
+      observer.disconnect()
+      window.removeEventListener("resize", updateToolbarWidth)
+      if (frameId !== null) cancelAnimationFrame(frameId)
+    }
+  }, [immersiveMode])
+
   useEffect(() => {
     return () => {
       if (longPressTimerRef.current !== null) {
@@ -376,6 +406,10 @@ export const Home: React.FC<HomeProps> = ({
     setSearchKeyword((prev) => `${prev}${keyValue}`)
   }
 
+  const getImmersivePopupContainer = useCallback((triggerNode: HTMLElement) => {
+    return immersiveToolbarRef.current ?? triggerNode.parentElement ?? document.body
+  }, [])
+
   const getDisplayText = (name: string) => {
     if (!name) return ""
     return name.length > 2 ? name.substring(name.length - 2) : name
@@ -2467,29 +2501,34 @@ export const Home: React.FC<HomeProps> = ({
         )}
       </Modal>
 
-      {immersiveMode && (
-        <div
-          style={{
-            position: "fixed",
-            left: "50%",
-            bottom: isPortraitMode ? "12px" : "16px",
-            transform: "translateX(-50%)",
-            zIndex: 1100,
-            width: "max-content",
-            maxWidth: "calc(100vw - 20px)",
-            borderRadius: "999px",
-            border: "1px solid color-mix(in srgb, var(--ss-border-color) 80%, transparent)",
-            backgroundColor: "var(--ss-card-bg)",
-            background: "color-mix(in srgb, var(--ss-card-bg) 62%, transparent)",
-            backdropFilter: "blur(16px)",
-            WebkitBackdropFilter: "blur(16px)",
-            boxShadow: "0 8px 30px rgba(0, 0, 0, 0.16)",
-            padding: "10px",
-            overflow: "hidden",
-          }}
-        >
+      <div
+        ref={immersiveToolbarRef}
+        data-immersive-toolbar="true"
+        className={`ss-immersive-toolbar ${immersiveMode ? "is-visible" : "is-hidden"}`}
+        aria-hidden={!immersiveMode}
+        style={{
+          position: "fixed",
+          left: "50%",
+          bottom: isPortraitMode ? "12px" : "16px",
+          zIndex: 1100,
+          width: immersiveToolbarWidth ? `${immersiveToolbarWidth}px` : "max-content",
+          maxWidth: "calc(100vw - 20px)",
+          borderRadius: "999px",
+          border: "1px solid color-mix(in srgb, var(--ss-border-color) 80%, transparent)",
+          backgroundColor: "var(--ss-card-bg)",
+          background: "color-mix(in srgb, var(--ss-card-bg) 62%, transparent)",
+          backdropFilter: "blur(16px)",
+          WebkitBackdropFilter: "blur(16px)",
+          boxShadow: "0 8px 30px rgba(0, 0, 0, 0.16)",
+          padding: "10px",
+          overflow: "visible",
+        }}
+      >
           <div
-            ref={searchAreaRef}
+            ref={(node) => {
+              searchAreaRef.current = node
+              immersiveToolbarContentRef.current = node
+            }}
             style={{
               display: "flex",
               alignItems: "center",
@@ -2519,6 +2558,7 @@ export const Home: React.FC<HomeProps> = ({
             <Select
               value={sortType}
               onChange={(v) => setSortType(v as SortType)}
+              getPopupContainer={getImmersivePopupContainer}
               style={{ width: 126, flexShrink: 0 }}
               options={[
                 { value: "alphabet", label: t("home.sortBy.alphabet") },
@@ -2530,6 +2570,7 @@ export const Home: React.FC<HomeProps> = ({
             <Select
               value={layoutType}
               onChange={(v) => setLayoutType(v as LayoutType)}
+              getPopupContainer={getImmersivePopupContainer}
               style={{ width: 126, flexShrink: 0 }}
               options={[
                 { value: "grouped", label: t("home.layoutBy.grouped") },
@@ -2625,8 +2666,7 @@ export const Home: React.FC<HomeProps> = ({
               </div>
             )}
           </div>
-        </div>
-      )}
+      </div>
 
       {isPortraitMode ? (
         <Drawer
diff --git a/src/i18n/locales/zh-CN.json b/src/i18n/locales/zh-CN.json
index a6b1188..f82b8fb 100644
--- a/src/i18n/locales/zh-CN.json
+++ b/src/i18n/locales/zh-CN.json
@@ -423,7 +423,7 @@
     "operationTitle": "积分操作：{{name}}",
     "submitOperation": "提交操作",
     "operationTitleBatch": "积分操作：已选 {{count}} 人",
-    "undoLastAction": "撤销上一步",
+    "undoLastAction": "撤销",
     "undoLastHint": "撤销上一条：{{name}} {{delta}}",
     "undoUnavailable": "当前没有可撤销的积分操作",
     "undoLastSuccess": "已撤销上一步积分操作",
@@ -592,7 +592,7 @@
   },
   "rewardExchange": {
     "title": "奖励兑换",
-    "enterMode": "进入奖励兑换模式",
+    "enterMode": "奖励兑换",
     "exitMode": "退出奖励兑换模式",
     "modeHint": "当前为奖励兑换模式，点击学生卡可选择可兑换奖励。",
     "normalHint": "当前显示学生原始积分，点击按钮后将显示可兑换积分。",