diff --git a/src/app/chat/components/chat-header.tsx b/src/app/chat/components/chat-header.tsx
index 6fba6eac..6bf693bf 100644
--- a/src/app/chat/components/chat-header.tsx
+++ b/src/app/chat/components/chat-header.tsx
@@ -6,14 +6,15 @@
  *
  * 两种模式：
  *   - 游客模式（isGuest=true）：渲染 `GuestBanner` 提示注册（点击 → /auth）
- *   - 登录模式（isGuest=false）：渲染 `MenuButton`（点击 → 打开 ChatMenuBar）
+ *   - 登录模式（isGuest=false）：渲染 `MenuButton`（点击 → push 到 /sidebar）
+ *
+ * 注意：菜单按钮直接 push 到侧边栏路由，**不**打开下拉菜单
+ * （Dart 端 `MenuButton(onTap: _goSidebar)` 行为）。
  */
 import { useRouter } from "next/navigation";
-import { useState } from "react";
 
 import { ROUTES } from "@/router/routes";
 
-import { ChatMenuBar } from "./chat-menu-bar";
 import styles from "./chat-header.module.css";
 
 export interface ChatHeaderProps {
@@ -22,7 +23,6 @@ export interface ChatHeaderProps {
 
 export function ChatHeader({ isGuest }: ChatHeaderProps) {
   const router = useRouter();
-  const [menuOpen, setMenuOpen] = useState(false);
 
   if (isGuest) {
     return (
@@ -43,29 +43,20 @@ export function ChatHeader({ isGuest }: ChatHeaderProps) {
   }
 
   return (
-    <>
-      <header className={styles.header}>
-        <div className={styles.headerRow}>
-          {/* 菜单按钮（点击 → 打开 ChatMenuBar 浮层） */}
-          <button
-            type="button"
-            className={styles.menuButton}
-            onClick={() => setMenuOpen(true)}
-            aria-label="Menu"
-            aria-expanded={menuOpen}
-          >
-            <span className={styles.menuIcon} aria-hidden="true">
-              ☰
-            </span>
-          </button>
-        </div>
-      </header>
-
-      <ChatMenuBar
-        open={menuOpen}
-        onClose={() => setMenuOpen(false)}
-        environmentName="dev"
-      />
-    </>
+    <header className={styles.header}>
+      <div className={styles.headerRow}>
+        {/* 菜单按钮（点击 → push 到 /sidebar，与 Dart MenuButton 一致） */}
+        <button
+          type="button"
+          className={styles.menuButton}
+          onClick={() => router.push(ROUTES.sidebar)}
+          aria-label="Menu"
+        >
+          <span className={styles.menuIcon} aria-hidden="true">
+            ☰
+          </span>
+        </button>
+      </div>
+    </header>
   );
 }
diff --git a/src/app/chat/components/chat-input-bar.module.css b/src/app/chat/components/chat-input-bar.module.css
index f8bd14d5..4dc0a361 100644
--- a/src/app/chat/components/chat-input-bar.module.css
+++ b/src/app/chat/components/chat-input-bar.module.css
@@ -1,35 +1,32 @@
-/* ChatInputBar 输入栏容器样式 */
+/* ChatInputBar 输入栏容器样式（与 Dart chat_input_bar.dart 对齐） */
 
+/* 外层：focused 时加 padding-top + 粉色背景 + 阴影 */
 .bar {
   flex: 0 0 auto;
-  padding: var(--spacing-3, 12px) var(--spacing-5, 20px) var(--spacing-5, 20px);
-  background: var(--color-input-bar-background, rgba(0, 0, 0, 0.4));
-  backdrop-filter: blur(8px);
-  border-top: 1px solid var(--color-chat-input-border, rgba(255, 255, 255, 0.12));
-  display: flex;
-  flex-direction: column;
-  gap: var(--spacing-2, 8px);
+  padding: 0 var(--spacing-lg, 16px) var(--spacing-lg, 16px);
+  background: transparent;
+  transition: padding-top 0.2s ease, background-color 0.2s ease,
+    box-shadow 0.2s ease;
 }
 
+.barFocused {
+  padding-top: var(--spacing-md, 12px);
+  background: #feeff2;
+  box-shadow: 0 4px 12px var(--color-input-box-shadow, rgba(0, 0, 0, 0.1));
+}
+
+/* 内层：白底 + 大圆角（Dart AppRadius.radius32）+ focused 时 accent 边框 */
 .row {
   display: flex;
   align-items: center;
-  gap: var(--spacing-2, 8px);
-  padding: var(--spacing-1, 4px) var(--spacing-3, 12px);
-  background: var(--color-bubble-background, #fff);
-  border-radius: 9999px;
-  border: 1px solid var(--color-chat-input-border, rgba(255, 255, 255, 0.2));
-  transition: border-color 0.2s, box-shadow 0.2s;
+  gap: var(--spacing-sm, 8px);
+  padding: var(--spacing-sm, 8px);
+  background: #fff;
+  border-radius: 32px;
+  border: 1px solid transparent;
+  transition: border-color 0.2s ease;
 }
 
 .rowFocused {
   border-color: var(--color-accent, #f84d96);
-  box-shadow: 0 4px 12px var(--color-input-shadow, rgba(0, 0, 0, 0.1));
-}
-
-.textFieldWrap {
-  flex: 1 1 auto;
-  min-width: 0;
-  display: flex;
-  align-items: center;
 }
diff --git a/src/app/chat/components/chat-input-bar.tsx b/src/app/chat/components/chat-input-bar.tsx
index f9a132d5..e444ffde 100644
--- a/src/app/chat/components/chat-input-bar.tsx
+++ b/src/app/chat/components/chat-input-bar.tsx
@@ -4,25 +4,28 @@
  *
  * 原始 Dart: lib/ui/chat/widgets/chat_input_bar.dart（121 行）
  *
- * 组成（从左到右）：
- *   - ChatMoreButton（⊞）：展开更多选项（图片/语音/功能）
- *   - ChatInputTextField：文本输入
- *   - ChatSendButton（↑）：发送
- *
- * 状态管理（自包含）：
+ * 状态：
  *   - input：受控文本
- *   - focused：是否聚焦（视觉状态）
- *   - hasContent：是否有内容（决定发送按钮启用）
+ *   - isFocused：是否聚焦（控制外层 pink-bg / box-shadow / padding-top）
+ *   - hasContent：是否有 trim 内容（决定发送按钮是否启用）
+ *
+ * 容器层次（与 Dart 一致）：
+ *   - 外层 `.bar`：focused 时 `padding-top: md` + 粉色背景 + 阴影
+ *   - 内层 `.row`：白底 + `border-radius: 32` + focused 时 accent 边框
+ *   - Row：[ChatInputTextField (Expanded), ChatSendButton]
+ *
+ * 行为：
+ *   - send 后清空 input + 保持 textarea 焦点（与 Dart `_focusNode.requestFocus()` 一致）
+ *
+ * 注意：Dart 源里的 `ImageUploadButton` 已被注释（`// const ImageUploadButton()`），
+ *       `ChatMoreButton` / `FunctionButtonBar` 不存在于 Dart 源；本组件仅保留与 Dart 一致的部分。
  */
-import { useState } from "react";
+import { useRef, useState } from "react";
 
 import { useChatDispatch } from "@/stores/chat/chat-context";
 
 import { ChatInputTextField } from "./chat-input-text-field";
-import { ChatMoreButton } from "./chat-more-button";
 import { ChatSendButton } from "./chat-send-button";
-import { FunctionButtonBar } from "./function-button-bar";
-import { ImageUploadButton } from "./image-upload-button";
 import styles from "./chat-input-bar.module.css";
 
 export interface ChatInputBarProps {
@@ -32,8 +35,8 @@ export interface ChatInputBarProps {
 export function ChatInputBar({ disabled = false }: ChatInputBarProps) {
   const dispatch = useChatDispatch();
   const [input, setInput] = useState("");
-  const [focused, setFocused] = useState(false);
-  const [showFunctions, setShowFunctions] = useState(false);
+  const [isFocused, setIsFocused] = useState(false);
+  const textareaRef = useRef<HTMLTextAreaElement>(null);
 
   const hasContent = input.trim().length > 0;
 
@@ -41,45 +44,24 @@ export function ChatInputBar({ disabled = false }: ChatInputBarProps) {
     if (!hasContent) return;
     dispatch({ type: "ChatSendMessage", content: input });
     setInput("");
+    textareaRef.current?.focus();
   };
 
   return (
-    <div className={styles.bar}>
-      {showFunctions && (
-        <FunctionButtonBar
-          items={[
-            {
-              key: "image",
-              icon: "🖼",
-              label: "Image",
-              // ImageUploadButton 内部已管理 sheet；FunctionButtonBar 仅触发
-              onClick: () => {
-                /* 触发：ImageUploadButton 已在 ChatInputBar 中渲染 */
-              },
-            },
-            { key: "restart", icon: "↻", label: "Restart" },
-            { key: "history", icon: "⏱", label: "History" },
-            { key: "call", icon: "📞", label: "Call" },
-          ]}
+    <div className={`${styles.bar} ${isFocused ? styles.barFocused : ""}`}>
+      <div className={`${styles.row} ${isFocused ? styles.rowFocused : ""}`}>
+        <ChatInputTextField
+          ref={textareaRef}
+          value={input}
+          onChange={setInput}
+          onSubmit={handleSend}
+          onFocusChange={setIsFocused}
+          disabled={disabled}
+        />
+        <ChatSendButton
+          disabled={!hasContent || disabled}
+          onClick={handleSend}
         />
-      )}
-
-      <div className={`${styles.row} ${focused ? styles.rowFocused : ""}`}>
-        <ImageUploadButton disabled={disabled} />
-        <ChatMoreButton onClick={() => setShowFunctions((v) => !v)} />
-        <div
-          className={styles.textFieldWrap}
-          onFocus={() => setFocused(true)}
-          onBlur={() => setFocused(false)}
-        >
-          <ChatInputTextField
-            value={input}
-            onChange={setInput}
-            onSubmit={handleSend}
-            disabled={disabled}
-          />
-        </div>
-        <ChatSendButton disabled={!hasContent || disabled} onClick={handleSend} />
       </div>
     </div>
   );
diff --git a/src/app/chat/components/chat-input-text-field.module.css b/src/app/chat/components/chat-input-text-field.module.css
index fb31bc62..4c0bf8bc 100644
--- a/src/app/chat/components/chat-input-text-field.module.css
+++ b/src/app/chat/components/chat-input-text-field.module.css
@@ -1,14 +1,28 @@
-/* ChatInputTextField 输入框样式 */
+/* ChatInputTextField 输入框样式（外层白底圆角容器 + 内部 textarea） */
 
+/* 外层圆角容器（与 Dart `Container(borderRadius: AppRadius.xxxl ≈ 32)` 一致） */
+.wrap {
+  flex: 1 1 auto;
+  min-width: 0;
+  display: flex;
+  align-items: center;
+  background: transparent; /* 容器透明，背景由 .row 提供 */
+}
+
+/* textarea 本身（裸元素，背景透明让父容器透出） */
 .textField {
+  flex: 1 1 auto;
+  min-width: 0;
   width: 100%;
-  height: 40px;
-  padding: 0 var(--spacing-4, 16px);
+  min-height: 40px;
+  max-height: 120px; /* 约 5 行 × 24px line-height */
+  padding: 0;
   border: 0;
   outline: none;
   background: transparent;
   color: var(--color-text-foreground, #000);
   font-size: var(--font-size-base, 14px);
+  line-height: 24px;
   resize: none;
   font-family: inherit;
 }
diff --git a/src/app/chat/components/chat-input-text-field.tsx b/src/app/chat/components/chat-input-text-field.tsx
index b0f4c881..946fa518 100644
--- a/src/app/chat/components/chat-input-text-field.tsx
+++ b/src/app/chat/components/chat-input-text-field.tsx
@@ -5,12 +5,22 @@
  * 原始 Dart: lib/ui/chat/widgets/chat_input_text_field.dart（75 行）
  *
  * 行为：
- *   - 多行输入（最多 5 行）
- *   - Enter 直接发送（无 Shift/Ctrl）
- *   - Shift+Enter / Ctrl+Enter 换行
- *   - 受控 + 非受控：value + onChange
+ *   - 多行输入（min 1 行 / max 5 行 ≈ max-height 120px）
+ *   - Enter 直接发送（无 Shift/Ctrl/Meta）
+ *   - Shift+Enter / Ctrl+Enter / Meta+Enter 换行
+ *   - 外层白底圆角容器（与 Dart `Container(borderRadius: AppRadius.xxxl ≈ 32)` 一致）
+ *
+ * 通过 `forwardRef` 暴露 textarea 节点，父组件可在 send 后调用 `.focus()`
+ * （对齐 Dart `_focusNode.requestFocus()`）。
+ * 通过 `onFocusChange` 回调通知父组件焦点状态，用于外层容器的聚焦样式切换。
  */
-import { type FormEvent, type KeyboardEvent } from "react";
+import {
+  forwardRef,
+  type FormEvent,
+  type KeyboardEvent,
+  useImperativeHandle,
+  useRef,
+} from "react";
 
 import styles from "./chat-input-text-field.module.css";
 
@@ -18,19 +28,32 @@ export interface ChatInputTextFieldProps {
   value: string;
   onChange: (value: string) => void;
   onSubmit: () => void;
+  /** 焦点变化回调（用于父组件 ChatInputBar 切换聚焦态视觉） */
+  onFocusChange?: (focused: boolean) => void;
   placeholder?: string;
   disabled?: boolean;
   autoFocus?: boolean;
 }
 
-export function ChatInputTextField({
-  value,
-  onChange,
-  onSubmit,
-  placeholder = "Say something…",
-  disabled = false,
-  autoFocus = false,
-}: ChatInputTextFieldProps) {
+export const ChatInputTextField = forwardRef<
+  HTMLTextAreaElement,
+  ChatInputTextFieldProps
+>(function ChatInputTextField(
+  {
+    value,
+    onChange,
+    onSubmit,
+    onFocusChange,
+    placeholder = "Say something…",
+    disabled = false,
+    autoFocus = false,
+  },
+  ref,
+) {
+  const innerRef = useRef<HTMLTextAreaElement>(null);
+  // 对外暴露与 forwardRef 同名的 ref（指向内部 textarea 节点）
+  useImperativeHandle(ref, () => innerRef.current as HTMLTextAreaElement, []);
+
   const handleKeyDown = (e: KeyboardEvent<HTMLTextAreaElement>) => {
     if (e.key !== "Enter") return;
     if (e.shiftKey || e.ctrlKey || e.metaKey) return; // 修饰键 → 换行
@@ -39,18 +62,23 @@ export function ChatInputTextField({
   };
 
   return (
-    <textarea
-      className={styles.textField}
-      value={value}
-      onChange={(e: FormEvent<HTMLTextAreaElement>) =>
-        onChange(e.currentTarget.value)
-      }
-      onKeyDown={handleKeyDown}
-      placeholder={placeholder}
-      disabled={disabled}
-      autoFocus={autoFocus}
-      rows={1}
-      aria-label="Message"
-    />
+    <div className={styles.wrap}>
+      <textarea
+        ref={innerRef}
+        className={styles.textField}
+        value={value}
+        onChange={(e: FormEvent<HTMLTextAreaElement>) =>
+          onChange(e.currentTarget.value)
+        }
+        onKeyDown={handleKeyDown}
+        onFocus={() => onFocusChange?.(true)}
+        onBlur={() => onFocusChange?.(false)}
+        placeholder={placeholder}
+        disabled={disabled}
+        autoFocus={autoFocus}
+        rows={1}
+        aria-label="Message"
+      />
+    </div>
   );
-}
+});
diff --git a/src/app/chat/components/chat-menu-bar.module.css b/src/app/chat/components/chat-menu-bar.module.css
deleted file mode 100644
index b1830432..00000000
--- a/src/app/chat/components/chat-menu-bar.module.css
+++ /dev/null
@@ -1,69 +0,0 @@
-/* ChatMenuBar 菜单栏样式 */
-
-.overlay {
-  position: fixed;
-  inset: 0;
-  z-index: 60;
-}
-
-.backdrop {
-  position: absolute;
-  inset: 0;
-  background: rgba(0, 0, 0, 0.4);
-}
-
-.menu {
-  position: absolute;
-  top: 56px;
-  right: 12px;
-  min-width: 200px;
-  background: var(--color-surface, #1f1a2e);
-  border: 1px solid rgba(255, 255, 255, 0.1);
-  border-radius: var(--radius-md, 8px);
-  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
-  padding: var(--spacing-1, 4px) 0;
-  display: flex;
-  flex-direction: column;
-  overflow: hidden;
-}
-
-.item {
-  display: flex;
-  align-items: center;
-  gap: var(--spacing-3, 12px);
-  padding: var(--spacing-3, 12px) var(--spacing-4, 16px);
-  background: transparent;
-  border: 0;
-  border-radius: 0;
-  color: var(--color-text-primary, #fff);
-  font-size: var(--font-size-base, 14px);
-  text-align: left;
-  cursor: pointer;
-  width: 100%;
-}
-
-.item:hover,
-.item:focus-visible {
-  background: rgba(255, 255, 255, 0.08);
-}
-
-.itemIcon {
-  font-size: 18px;
-  width: 20px;
-  text-align: center;
-}
-
-.divider {
-  height: 1px;
-  background: rgba(255, 255, 255, 0.1);
-  margin: var(--spacing-1, 4px) 0;
-}
-
-.badge {
-  margin-left: auto;
-  font-size: var(--font-size-xs, 11px);
-  padding: 2px 6px;
-  background: var(--color-accent, #f84d96);
-  color: #fff;
-  border-radius: 9999px;
-}
diff --git a/src/app/chat/components/chat-menu-bar.tsx b/src/app/chat/components/chat-menu-bar.tsx
deleted file mode 100644
index 88cd65bb..00000000
--- a/src/app/chat/components/chat-menu-bar.tsx
+++ /dev/null
@@ -1,138 +0,0 @@
-"use client";
-/**
- * ChatMenuBar 菜单栏（悬浮下拉菜单）
- *
- * 原始 Dart: lib/ui/chat/widgets/chat_menu_bar.dart（224 行，原始文件全部注释）
- * 原始设计：横向 Row[环境 / 语言 / 登录] 三个胶囊按钮
- *
- * 本轮采用 TS 现代版：**悬浮下拉菜单**
- *   - 由 ChatHeader 的 ☰ 按钮触发
- *   - 右上方弹出 menu（环境/语言/设置/退出登录）
- *   - 点击外部 / 选项 → 关闭
- *
- * 优势：
- *   - 占用更少屏幕空间（与原 Dart 三个胶囊按钮对比）
- *   - 与 ChatHeader 的 ☰ 按钮天然配合
- *   - 易于扩展更多菜单项
- */
-import { useRouter } from "next/navigation";
-import { useEffect, useRef } from "react";
-
-import { ROUTES } from "@/router/routes";
-import { SpAsyncUtil } from "@/utils/storage";
-import { useAuthDispatch } from "@/stores/auth/auth-context";
-import { useUserDispatch } from "@/stores/user/user-context";
-
-import styles from "./chat-menu-bar.module.css";
-
-export interface ChatMenuBarProps {
-  open: boolean;
-  onClose: () => void;
-  /** 当前环境名（开发/测试/生产），用于显示在菜单中 */
-  environmentName?: string;
-}
-
-export interface ChatMenuItem {
-  key: string;
-  icon: string;
-  label: string;
-  badge?: string;
-  onClick: () => void;
-  danger?: boolean;
-}
-
-export function ChatMenuBar({
-  open,
-  onClose,
-  environmentName = "dev",
-}: ChatMenuBarProps) {
-  const router = useRouter();
-  const authDispatch = useAuthDispatch();
-  const userDispatch = useUserDispatch();
-  const menuRef = useRef<HTMLDivElement>(null);
-
-  // ESC 关闭
-  useEffect(() => {
-    if (!open) return;
-    const onKey = (e: KeyboardEvent) => {
-      if (e.key === "Escape") onClose();
-    };
-    document.addEventListener("keydown", onKey);
-    return () => document.removeEventListener("keydown", onKey);
-  }, [open, onClose]);
-
-  if (!open) return null;
-
-  const items: ChatMenuItem[] = [
-    {
-      key: "language",
-      icon: "🌐",
-      label: "Language",
-      onClick: () => {
-        // 触发语言切换弹窗（占位：alert）
-        window.alert("Language dialog: see Round 5 LanguageDialog");
-        onClose();
-      },
-    },
-    {
-      key: "environment",
-      icon: "⚙️",
-      label: `Environment: ${environmentName}`,
-      onClick: () => {
-        window.alert("Environment switcher: see Round 5");
-        onClose();
-      },
-    },
-    { key: "divider1", icon: "", label: "", onClick: () => {} },
-    {
-      key: "logout",
-      icon: "🚪",
-      label: "Sign out",
-      danger: true,
-      onClick: async () => {
-        // 清空本地存储 + 触发 logout 事件
-        await SpAsyncUtil.clear();
-        authDispatch({ type: "AuthReset" });
-        userDispatch({ type: "UserUpdate", user: null as never });
-        onClose();
-        router.push(ROUTES.splash);
-      },
-    },
-  ];
-
-  return (
-    <div className={styles.overlay}>
-      <div
-        className={styles.backdrop}
-        onClick={onClose}
-        aria-hidden="true"
-      />
-      <div
-        ref={menuRef}
-        className={styles.menu}
-        role="menu"
-        aria-orientation="vertical"
-      >
-        {items.map((item) =>
-          item.key.startsWith("divider") ? (
-            <div key={item.key} className={styles.divider} />
-          ) : (
-            <button
-              key={item.key}
-              type="button"
-              className={styles.item}
-              onClick={item.onClick}
-              role="menuitem"
-            >
-              <span className={styles.itemIcon} aria-hidden="true">
-                {item.icon}
-              </span>
-              <span>{item.label}</span>
-              {item.badge && <span className={styles.badge}>{item.badge}</span>}
-            </button>
-          ),
-        )}
-      </div>
-    </div>
-  );
-}
diff --git a/src/app/chat/components/chat-more-button.module.css b/src/app/chat/components/chat-more-button.module.css
deleted file mode 100644
index bae92809..00000000
--- a/src/app/chat/components/chat-more-button.module.css
+++ /dev/null
@@ -1,22 +0,0 @@
-/* ChatMoreButton "更多"按钮 */
-
-.button {
-  flex: 0 0 auto;
-  width: 40px;
-  height: 40px;
-  border: 0;
-  border-radius: 9999px;
-  background: var(--color-bubble-transparent, rgba(255, 255, 255, 0));
-  color: var(--color-text-primary, #fff);
-  cursor: pointer;
-  display: flex;
-  align-items: center;
-  justify-content: center;
-}
-
-.icon {
-  width: 24px;
-  height: 24px;
-  font-size: 24px;
-  line-height: 1;
-}
diff --git a/src/app/chat/components/chat-more-button.tsx b/src/app/chat/components/chat-more-button.tsx
deleted file mode 100644
index 50e468d7..00000000
--- a/src/app/chat/components/chat-more-button.tsx
+++ /dev/null
@@ -1,29 +0,0 @@
-"use client";
-/**
- * ChatMoreButton "更多"按钮
- *
- * 原始 Dart: lib/ui/chat/widgets/chat_more_button.dart（29 行）
- *
- * 用途：展开图片上传 / 语音输入 / 功能按钮等更多选项
- * 第 2 轮：仅占位（点击无操作或打开菜单）
- */
-import styles from "./chat-more-button.module.css";
-
-export interface ChatMoreButtonProps {
-  onClick: () => void;
-}
-
-export function ChatMoreButton({ onClick }: ChatMoreButtonProps) {
-  return (
-    <button
-      type="button"
-      className={styles.button}
-      onClick={onClick}
-      aria-label="More options"
-    >
-      <span className={styles.icon} aria-hidden="true">
-        ⊞
-      </span>
-    </button>
-  );
-}
diff --git a/src/app/chat/components/chat-screen.tsx b/src/app/chat/components/chat-screen.tsx
index e9ece6eb..1f798570 100644
--- a/src/app/chat/components/chat-screen.tsx
+++ b/src/app/chat/components/chat-screen.tsx
@@ -24,6 +24,8 @@ import Image from "next/image";
 import { useChatDispatch, useChatState } from "@/stores/chat/chat-context";
 import { GuestChatQuota } from "@/stores/chat/chat-types";
 
+import { MobileShell } from "@/app/_components/core/mobile-shell";
+
 import { BrowserHintOverlay } from "./browser-hint-overlay";
 import { ChatArea } from "./chat-area";
 import { ChatHeader } from "./chat-header";
@@ -76,42 +78,44 @@ export function ChatScreen() {
   }, [state.guestRemainingQuota, state.isGuest]);
 
   return (
-    <div className={styles.shell}>
-      {/* 背景图（与原 Dart MobileLayout 一致） */}
-      <div className={styles.background}>
-        <Image
-          src="/images/chat/bg-chatpage.png"
-          alt=""
-          fill
-          priority
-          sizes="(max-width: 500px) 100vw, 500px"
+    <MobileShell>
+      <div className={styles.shell}>
+        {/* 背景图（与原 Dart MobileLayout 一致） */}
+        <div className={styles.background}>
+          <Image
+            src="/images/chat/bg-chatpage.png"
+            alt=""
+            fill
+            priority
+            sizes="(max-width: 500px) 100vw, 500px"
+          />
+        </div>
+
+        <div className={styles.layout}>
+          <ChatHeader isGuest={state.isGuest} />
+
+          <ChatArea
+            messages={state.messages}
+            isReplyingAI={state.isReplyingAI}
+            isGuest={state.isGuest}
+          />
+
+          <ChatInputBar disabled={state.isReplyingAI} />
+        </div>
+
+        {/* 浏览器提示（应用内浏览器检测） */}
+        <BrowserHintOverlay />
+
+        {/* PWA 安装提示触发器（无可见 UI，3.5s 后弹 dialog） */}
+        <PwaInstallOverlay />
+
+        {/* 配额告警弹窗 */}
+        <QuotaDialog
+          open={quotaDialogOpen}
+          onClose={() => setQuotaDialogOpen(false)}
+          isExhausted={quotaExhausted}
         />
       </div>
-
-      <div className={styles.layout}>
-        <ChatHeader isGuest={state.isGuest} />
-
-        <ChatArea
-          messages={state.messages}
-          isReplyingAI={state.isReplyingAI}
-          isGuest={state.isGuest}
-        />
-
-        <ChatInputBar disabled={state.isReplyingAI} />
-      </div>
-
-      {/* 浏览器提示（应用内浏览器检测） */}
-      <BrowserHintOverlay />
-
-      {/* PWA 安装提示触发器（无可见 UI，3.5s 后弹 dialog） */}
-      <PwaInstallOverlay />
-
-      {/* 配额告警弹窗 */}
-      <QuotaDialog
-        open={quotaDialogOpen}
-        onClose={() => setQuotaDialogOpen(false)}
-        isExhausted={quotaExhausted}
-      />
-    </div>
+    </MobileShell>
   );
 }
diff --git a/src/app/chat/components/function-button-bar.module.css b/src/app/chat/components/function-button-bar.module.css
deleted file mode 100644
index 4ef3e11e..00000000
--- a/src/app/chat/components/function-button-bar.module.css
+++ /dev/null
@@ -1,30 +0,0 @@
-/* FunctionButtonBar 功能按钮栏样式 */
-
-.bar {
-  display: flex;
-  gap: var(--spacing-2, 8px);
-  padding: 0 var(--spacing-5, 20px) var(--spacing-2, 8px);
-  overflow-x: auto;
-}
-
-.button {
-  flex: 0 0 auto;
-  height: 36px;
-  padding: 0 var(--spacing-3, 12px);
-  border: 0;
-  border-radius: 9999px;
-  background: var(--color-button-background, rgba(255, 255, 255, 0.1));
-  color: var(--color-text-primary, #fff);
-  font-size: var(--font-size-sm, 12px);
-  cursor: pointer;
-  display: inline-flex;
-  align-items: center;
-  gap: var(--spacing-1, 4px);
-}
-
-.icon {
-  width: 16px;
-  height: 16px;
-  font-size: 16px;
-  line-height: 1;
-}
diff --git a/src/app/chat/components/function-button-bar.tsx b/src/app/chat/components/function-button-bar.tsx
deleted file mode 100644
index a90737bb..00000000
--- a/src/app/chat/components/function-button-bar.tsx
+++ /dev/null
@@ -1,49 +0,0 @@
-"use client";
-/**
- * FunctionButtonBar 功能按钮栏
- *
- * 原始 Dart: lib/ui/chat/widgets/function_button_bar.dart（52 行）
- *
- * 横向滚动按钮组：Restart / History / Call / 等
- * 每个按钮：图标 + 标签
- */
-import styles from "./function-button-bar.module.css";
-
-export interface FunctionButtonItem {
-  key: string;
-  icon: string; // emoji 占位（生产环境可换为 react-icons / svg）
-  label: string;
-  onClick?: () => void;
-}
-
-export interface FunctionButtonBarProps {
-  items?: readonly FunctionButtonItem[];
-}
-
-const DEFAULT_ITEMS: readonly FunctionButtonItem[] = [
-  { key: "restart", icon: "↻", label: "Restart" },
-  { key: "history", icon: "⏱", label: "History" },
-  { key: "call", icon: "📞", label: "Call" },
-];
-
-export function FunctionButtonBar({
-  items = DEFAULT_ITEMS,
-}: FunctionButtonBarProps) {
-  return (
-    <div className={styles.bar} role="toolbar" aria-label="Chat functions">
-      {items.map((it) => (
-        <button
-          key={it.key}
-          type="button"
-          className={styles.button}
-          onClick={it.onClick}
-        >
-          <span className={styles.icon} aria-hidden="true">
-            {it.icon}
-          </span>
-          <span>{it.label}</span>
-        </button>
-      ))}
-    </div>
-  );
-}
diff --git a/src/app/chat/components/image-upload-button.module.css b/src/app/chat/components/image-upload-button.module.css
deleted file mode 100644
index 6586656a..00000000
--- a/src/app/chat/components/image-upload-button.module.css
+++ /dev/null
@@ -1,62 +0,0 @@
-/* ImageUploadButton 图片上传按钮样式 */
-
-.button {
-  flex: 0 0 auto;
-  width: 40px;
-  height: 40px;
-  border: 1px solid var(--color-bubble-border, rgba(255, 255, 255, 0.2));
-  border-radius: 9999px;
-  background: var(--color-bubble-transparent, rgba(255, 255, 255, 0));
-  color: var(--color-text-primary, #fff);
-  cursor: pointer;
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  transition: opacity 0.2s;
-}
-
-.button:disabled {
-  opacity: 0.5;
-  cursor: not-allowed;
-}
-
-.hidden {
-  display: none;
-}
-
-.bottomSheet {
-  position: fixed;
-  bottom: 0;
-  left: 0;
-  right: 0;
-  z-index: 50;
-  background: var(--color-dark-surface, #1f1a2e);
-  border-top-left-radius: var(--radius-xl, 20px);
-  border-top-right-radius: var(--radius-xl, 20px);
-  padding: var(--spacing-4, 16px) 0;
-  padding-bottom: max(var(--spacing-4, 16px), env(safe-area-inset-bottom));
-  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.3);
-}
-
-.sheetItem {
-  display: flex;
-  align-items: center;
-  gap: var(--spacing-3, 12px);
-  padding: var(--spacing-3, 12px) var(--spacing-5, 20px);
-  background: transparent;
-  border: 0;
-  color: var(--color-text-primary, #fff);
-  font-size: var(--font-size-base, 14px);
-  width: 100%;
-  text-align: left;
-  cursor: pointer;
-}
-
-.sheetItem:hover,
-.sheetItem:focus-visible {
-  background: rgba(255, 255, 255, 0.05);
-}
-
-.sheetIcon {
-  font-size: 20px;
-}
diff --git a/src/app/chat/components/image-upload-button.tsx b/src/app/chat/components/image-upload-button.tsx
deleted file mode 100644
index 17c71ee3..00000000
--- a/src/app/chat/components/image-upload-button.tsx
+++ /dev/null
@@ -1,119 +0,0 @@
-"use client";
-/**
- * ImageUploadButton 图片上传按钮
- *
- * 原始 Dart: lib/ui/chat/widgets/image_upload_button.dart（159 行）
- *
- * 原 Dart 使用 image_picker 库（移动端原生相册/相机）
- * 本轮使用 Web File API（`<input type="file">`）以避免添加原生依赖
- *
- * 行为：
- *   - 点击按钮 → 弹出底部 sheet（相册 / 取消）
- *   - 选择图片 → 读取为 base64 → dispatch ChatSendImage
- *   - 上传中按钮显示加载指示器
- */
-import { useRef, useState } from "react";
-
-import { useChatDispatch } from "@/stores/chat/chat-context";
-
-import styles from "./image-upload-button.module.css";
-
-export interface ImageUploadButtonProps {
-  disabled?: boolean;
-}
-
-export function ImageUploadButton({ disabled = false }: ImageUploadButtonProps) {
-  const dispatch = useChatDispatch();
-  const fileInputRef = useRef<HTMLInputElement>(null);
-  const [showSheet, setShowSheet] = useState(false);
-  const [isUploading, setIsUploading] = useState(false);
-
-  const handleFile = async (file: File) => {
-    if (isUploading) return;
-    setIsUploading(true);
-    setShowSheet(false);
-
-    try {
-      const buffer = await file.arrayBuffer();
-      const bytes = new Uint8Array(buffer);
-      let binary = "";
-      for (let i = 0; i < bytes.byteLength; i++) {
-        binary += String.fromCharCode(bytes[i]);
-      }
-      const base64 = window.btoa(binary);
-      const ext = file.name.split(".").pop()?.toLowerCase() || "png";
-      const mime = file.type || `image/${ext}`;
-      const dataUri = `data:${mime};base64,${base64}`;
-
-      dispatch({ type: "ChatSendImage", imageBase64: dataUri });
-    } catch (e) {
-      console.error("[ImageUpload] failed:", e);
-    } finally {
-      setIsUploading(false);
-    }
-  };
-
-  return (
-    <>
-      <button
-        type="button"
-        className={styles.button}
-        disabled={disabled || isUploading}
-        onClick={() => setShowSheet(true)}
-        aria-label="Upload image"
-      >
-        {isUploading ? "⏳" : "🖼"}
-      </button>
-
-      {/* 隐藏的文件 input（触发文件选择） */}
-      <input
-        ref={fileInputRef}
-        type="file"
-        accept="image/*"
-        className={styles.hidden}
-        onChange={(e) => {
-          const file = e.currentTarget.files?.[0];
-          if (file) void handleFile(file);
-          e.currentTarget.value = ""; // 允许重选同一文件
-        }}
-      />
-
-      {/* 底部选择 sheet（相册/取消） */}
-      {showSheet && (
-        <>
-          <div
-            style={{
-              position: "fixed",
-              inset: 0,
-              zIndex: 49,
-              background: "rgba(0,0,0,0.4)",
-            }}
-            onClick={() => setShowSheet(false)}
-          />
-          <div className={styles.bottomSheet} role="dialog">
-            <button
-              type="button"
-              className={styles.sheetItem}
-              onClick={() => fileInputRef.current?.click()}
-            >
-              <span className={styles.sheetIcon} aria-hidden="true">
-                🖼
-              </span>
-              <span>Choose from gallery</span>
-            </button>
-            <button
-              type="button"
-              className={styles.sheetItem}
-              onClick={() => setShowSheet(false)}
-            >
-              <span className={styles.sheetIcon} aria-hidden="true">
-                ✕
-              </span>
-              <span>Cancel</span>
-            </button>
-          </div>
-        </>
-      )}
-    </>
-  );
-}
diff --git a/src/app/chat/components/index.ts b/src/app/chat/components/index.ts
index ac5ac0c3..e2de7188 100644
--- a/src/app/chat/components/index.ts
+++ b/src/app/chat/components/index.ts
@@ -5,9 +5,8 @@
 // 屏幕 + 顶层
 export { ChatScreen } from "./chat-screen";
 
-// 顶部 + 菜单
+// 顶部
 export { ChatHeader } from "./chat-header";
-export { ChatMenuBar } from "./chat-menu-bar";
 
 // 消息区
 export { ChatArea } from "./chat-area";
@@ -16,9 +15,6 @@ export { ChatArea } from "./chat-area";
 export { ChatInputBar } from "./chat-input-bar";
 export { ChatInputTextField } from "./chat-input-text-field";
 export { ChatSendButton } from "./chat-send-button";
-export { ChatMoreButton } from "./chat-more-button";
-export { ImageUploadButton } from "./image-upload-button";
-export { FunctionButtonBar } from "./function-button-bar";
 
 // 消息气泡
 export { MessageBubble } from "./message-bubble";
diff --git a/src/app/chat/components/pwa-install-overlay.module.css b/src/app/chat/components/pwa-install-overlay.module.css
index 42c5813b..85554c11 100644
--- a/src/app/chat/components/pwa-install-overlay.module.css
+++ b/src/app/chat/components/pwa-install-overlay.module.css
@@ -1,5 +1,5 @@
 /* PwaInstallOverlay PWA 安装弹窗触发器样式（无可见 UI，逻辑触发用） */
 
-/.hidden {
+.hidden {
   display: none;
 }
diff --git a/src/utils/storage.ts b/src/utils/storage.ts
index 280910bc..d82d3395 100644
--- a/src/utils/storage.ts
+++ b/src/utils/storage.ts
@@ -1,3 +1,4 @@
+"use client";
 /**
  * SpAsyncUtil — 键值对持久化工具类（基于 unstorage）
  *