diff --git a/package.json b/package.json
index e59f1aa..1a58105 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,7 @@
     "axios": "^1.15.0",
     "highlight.js": "^11.11.1",
     "katex": "^0.16.45",
+    "lucide-react": "^1.9.0",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
     "react-markdown": "^10.1.0",
diff --git a/src/components/StreamMessage.tsx b/src/components/StreamMessage.tsx
index f3dcea8..3868e84 100644
--- a/src/components/StreamMessage.tsx
+++ b/src/components/StreamMessage.tsx
@@ -1,6 +1,6 @@
 import { useState } from "react";
-import { CheckOutlined, CopyOutlined } from "@ant-design/icons";
 import { Button, message } from "antd";
+import { Check, Copy } from "lucide-react";
 import ReactMarkdown from "react-markdown";
 import remarkGfm from "remark-gfm";
 import remarkMath from "remark-math";
@@ -47,7 +47,7 @@ function MarkdownPreBlock(props: { children: ReactNode }) {
         <Button
           type="text"
           size="small"
-          icon={copied ? <CheckOutlined /> : <CopyOutlined />}
+          icon={copied ? <Check size={16} /> : <Copy size={16} />}
           className="text-neutral-600 hover:bg-black/5! hover:text-neutral-800!"
           onClick={() => {
             void onCopy();
diff --git a/src/index.css b/src/index.css
index 68d8d1f..c74e336 100644
--- a/src/index.css
+++ b/src/index.css
@@ -83,3 +83,9 @@ pre code.hljs {
 .ant-dropdown-menu-item-danger {
   border-radius: 12px !important;
 }
+
+/* 修正 lucide 图标在 AntD Button 中的基线偏移 */
+.ant-btn .ant-btn-icon > .lucide {
+  display: block;
+  transform: translateY(1px);
+}
diff --git a/src/pages/index.tsx b/src/pages/index.tsx
index 32fb304..c22e7d1 100644
--- a/src/pages/index.tsx
+++ b/src/pages/index.tsx
@@ -1,26 +1,27 @@
 import type { CSSProperties } from "react";
 import { useCallback, useEffect, useMemo, useRef, useState, useSyncExternalStore } from "react";
 import {
-  ArrowUpOutlined,
-  CopyOutlined,
-  DeleteOutlined,
-  EditOutlined,
-  LogoutOutlined,
-  MenuFoldOutlined,
-  MenuUnfoldOutlined,
-  MobileOutlined,
-  MoreOutlined,
-  PaperClipOutlined,
-  PlusOutlined,
-  QuestionCircleOutlined,
-  RedoOutlined,
-  SearchOutlined,
-  ShareAltOutlined,
-  SettingOutlined,
-  ThunderboltOutlined,
-  VerticalAlignTopOutlined,
-  UserOutlined,
-} from "@ant-design/icons";
+  ArrowUp,
+  ChevronDown,
+  Copy,
+  Ellipsis,
+  LogOut,
+  MessageCirclePlus,
+  Paperclip,
+  PanelLeftClose,
+  PanelLeftOpen,
+  Pencil,
+  Pin,
+  RotateCcw,
+  Search,
+  Settings,
+  Share2,
+  Smartphone,
+  Trash2,
+  User,
+  Zap,
+  CircleHelp,
+} from "lucide-react";
 import {
   Avatar,
   Button,
@@ -88,13 +89,7 @@ function subscribeUserProfile(onChange: () => void) {
   };
 }
 
-const INITIAL_MESSAGES: UiMessage[] = [
-  {
-    id: "init-assistant",
-    role: "assistant",
-    content: "你好，我是 ChatOne 助手，有什么可以帮你？",
-  },
-];
+const INITIAL_MESSAGES: UiMessage[] = [];
 
 const STREAM_TIMEOUT_MS = 90000;
 const MAX_STREAM_RETRY = 1;
@@ -155,7 +150,9 @@ export default function HomePage() {
     }
   });
   const messageListRef = useRef<HTMLDivElement | null>(null);
+  const shouldStickToBottomRef = useRef(true);
   const abortRef = useRef<AbortController | null>(null);
+  const [showScrollToBottom, setShowScrollToBottom] = useState(false);
 
   const [sessions, setSessions] = useState<ChatSession[]>([]);
   const [sessionsLoading, setSessionsLoading] = useState(false);
@@ -200,18 +197,18 @@ export default function HomePage() {
   const userMenuDividerStyle: CSSProperties = { margin: "10px 0" };
 
   const userMenuItems: MenuProps["items"] = [
-    { key: "app", icon: <MobileOutlined />, label: "下载手机应用", style: userMenuItemStyle },
-    { key: "settings", icon: <SettingOutlined />, label: "系统设置", style: userMenuItemStyle },
+    { key: "app", icon: <Smartphone size={16} />, label: "下载手机应用", style: userMenuItemStyle },
+    { key: "settings", icon: <Settings size={16} />, label: "系统设置", style: userMenuItemStyle },
     {
       key: "help",
-      icon: <QuestionCircleOutlined />,
+      icon: <CircleHelp size={16} />,
       label: "帮助与反馈",
       style: userMenuItemStyle,
     },
     { type: "divider", style: userMenuDividerStyle },
     {
       key: "logout",
-      icon: <LogoutOutlined />,
+      icon: <LogOut size={16} />,
       label: "退出登录",
       danger: true,
       style: userMenuItemStyle,
@@ -258,11 +255,42 @@ export default function HomePage() {
     };
   }, []);
 
+  const isMessageListAtBottom = useCallback(() => {
+    const el = messageListRef.current;
+    if (!el) return true;
+    // 允许少量像素误差，避免小数像素造成闪烁。
+    return el.scrollHeight - el.scrollTop - el.clientHeight <= 24;
+  }, []);
+
+  const scrollMessageListToBottom = useCallback((behavior: ScrollBehavior = "smooth") => {
+    const el = messageListRef.current;
+    if (!el) return;
+    el.scrollTo({ top: el.scrollHeight, behavior });
+  }, []);
+
   useEffect(() => {
     const el = messageListRef.current;
     if (!el) return;
-    el.scrollTop = el.scrollHeight;
-  }, [messages]);
+    const onScroll = () => {
+      const atBottom = isMessageListAtBottom();
+      shouldStickToBottomRef.current = atBottom;
+      setShowScrollToBottom(!atBottom);
+    };
+    onScroll();
+    el.addEventListener("scroll", onScroll, { passive: true });
+    return () => {
+      el.removeEventListener("scroll", onScroll);
+    };
+  }, [isMessageListAtBottom]);
+
+  useEffect(() => {
+    if (shouldStickToBottomRef.current) {
+      scrollMessageListToBottom("auto");
+      setShowScrollToBottom(false);
+    } else {
+      setShowScrollToBottom(true);
+    }
+  }, [messages, scrollMessageListToBottom]);
 
   const refreshSessionList = useCallback(async (): Promise<ChatSession[]> => {
     if (!window.localStorage.getItem(ACCESS_TOKEN_KEY)) return [];
@@ -567,7 +595,7 @@ export default function HomePage() {
           loading={sessionMutationBusy}
           disabled={sessionsLoading}
           className="h-10! rounded-xl! border-[var(--ds-border)]! bg-[var(--ds-bg-main)]! text-[13px]! font-medium shadow-none hover:border-sky-300! hover:text-sky-600!"
-          icon={<PlusOutlined />}
+          icon={<MessageCirclePlus size={14} strokeWidth={2} />}
           onClick={() => {
             void handleNewSession();
           }}
@@ -600,9 +628,9 @@ export default function HomePage() {
               const active = sid === activeSessionId;
               const itemMenu: MenuProps = {
                 items: [
-                  { key: "rename", icon: <EditOutlined />, label: "重命名" },
-                  { key: "pin", icon: <VerticalAlignTopOutlined />, label: "置顶" },
-                  { key: "delete", icon: <DeleteOutlined />, danger: true, label: "删除" },
+                  { key: "rename", icon: <Pencil size={16} />, label: "重命名" },
+                  { key: "pin", icon: <Pin size={16} />, label: "置顶" },
+                  { key: "delete", icon: <Trash2 size={16} />, danger: true, label: "删除" },
                 ],
                 onClick: ({ key, domEvent }) => {
                   domEvent.stopPropagation();
@@ -614,7 +642,7 @@ export default function HomePage() {
               return (
                 <div
                   key={sid}
-                  className="mb-1 flex w-full items-center gap-1 rounded-xl pr-1 text-[14px] text-neutral-700 transition-colors hover:bg-black/5"
+                  className="group mb-1.5 flex w-full items-center gap-1 rounded-2xl pr-1 text-[14px] text-neutral-700 transition-colors hover:bg-black/5"
                   style={{
                     background: active ? "var(--ds-active-item)" : undefined,
                     color: active ? "var(--ds-accent)" : undefined,
@@ -625,23 +653,29 @@ export default function HomePage() {
                     onClick={() => {
                       void openSession(sid);
                     }}
-                    className="flex min-h-12 min-w-0 flex-1 items-center rounded-xl px-3 py-3 text-left"
+                    className="flex h-11 min-w-0 flex-1 cursor-pointer items-center rounded-2xl px-4 text-left"
                   >
-                    {(!collapsed || isMobile) && <span className="truncate">{title}</span>}
+                    {(!collapsed || isMobile) && (
+                      <span className="min-w-0 flex-1 truncate text-[14px] leading-none">
+                        {title}
+                      </span>
+                    )}
                   </button>
                   {(!collapsed || isMobile) && (
-                    <Dropdown menu={itemMenu} trigger={["click"]} placement="bottomRight">
-                      <Button
-                        type="text"
-                        size="small"
-                        icon={<MoreOutlined />}
-                        loading={sessionActionBusyId === sid}
-                        className="text-neutral-500 hover:bg-black/5!"
-                        onClick={(event) => {
-                          event.stopPropagation();
-                        }}
-                      />
-                    </Dropdown>
+                    <div className={`${active ? "flex" : "hidden group-hover:flex"}`}>
+                      <Dropdown menu={itemMenu} trigger={["click"]} placement="bottomRight">
+                        <Button
+                          type="text"
+                          size="small"
+                          icon={<Ellipsis size={16} />}
+                          loading={sessionActionBusyId === sid}
+                          className="!flex !h-8 !w-8 !items-center !justify-center rounded-xl text-neutral-500 hover:bg-black/5!"
+                          onClick={(event) => {
+                            event.stopPropagation();
+                          }}
+                        />
+                      </Dropdown>
+                    </div>
                   )}
                 </div>
               );
@@ -650,7 +684,7 @@ export default function HomePage() {
         )}
       </div>
 
-      <div className="shrink-0 border-t border-[var(--ds-border)] p-3">
+      <div className="shrink-0 p-3">
         <Dropdown
           menu={{ items: userMenuItems, onClick: onUserMenuClick }}
           placement="topLeft"
@@ -658,14 +692,14 @@ export default function HomePage() {
         >
           <button
             type="button"
-            className={`flex w-full items-center gap-2 rounded-xl bg-neutral-100 px-2 py-2 text-left transition-colors hover:bg-neutral-200/90 ${
+            className={`flex w-full cursor-pointer items-center gap-2 rounded-xl bg-neutral-100 px-2 py-2 text-left transition-colors hover:bg-neutral-200/90 ${
               collapsed && !isMobile ? "justify-center py-2.5" : ""
             }`}
           >
             <Avatar
               size={36}
               src={userProfile.avatar}
-              icon={!userProfile.avatar ? <UserOutlined /> : undefined}
+              icon={!userProfile.avatar ? <User size={18} /> : undefined}
               className="shrink-0 bg-neutral-300"
             />
             {(!collapsed || isMobile) && (
@@ -673,7 +707,7 @@ export default function HomePage() {
                 <span className="min-w-0 flex-1 truncate text-[13px] font-medium text-neutral-800">
                   {userProfile.displayName}
                 </span>
-                <MoreOutlined className="shrink-0 text-neutral-500" />
+                <Ellipsis size={16} className="shrink-0 text-neutral-500" />
               </>
             )}
           </button>
@@ -696,10 +730,10 @@ export default function HomePage() {
           width={260}
           collapsedWidth={72}
           theme="light"
-          className="!min-h-0 !h-full !overflow-hidden !bg-[var(--ds-bg-sider)] !border-r !border-[var(--ds-border)]"
+          className="!min-h-0 !h-full !overflow-hidden !bg-[var(--ds-bg-sider)]"
         >
           <div className="flex h-full min-h-0 min-w-0 flex-col">
-            <div className="flex h-14 shrink-0 items-center gap-2 border-b border-[var(--ds-border)] px-3">
+            <div className="flex h-14 shrink-0 items-center gap-2 px-3">
               <img
                 src="/logo.png"
                 alt=""
@@ -724,7 +758,7 @@ export default function HomePage() {
         style={{ background: "var(--ds-bg-main)" }}
       >
         <Header
-          className="!flex !h-14 !shrink-0 !items-center !justify-between !border-b !border-[var(--ds-border)] !bg-[var(--ds-bg-main)] !px-5"
+          className="!flex !h-14 !shrink-0 !items-center !justify-between !bg-[var(--ds-bg-main)] !px-5"
           style={{ lineHeight: "56px" }}
         >
           <div className="flex items-center gap-3">
@@ -733,11 +767,11 @@ export default function HomePage() {
               className="text-neutral-500 hover:bg-black/5!"
               icon={
                 isMobile ? (
-                  <MenuUnfoldOutlined />
+                  <PanelLeftOpen size={16} />
                 ) : collapsed ? (
-                  <MenuUnfoldOutlined />
+                  <PanelLeftOpen size={16} />
                 ) : (
-                  <MenuFoldOutlined />
+                  <PanelLeftClose size={16} />
                 )
               }
               onClick={() => {
@@ -770,203 +804,223 @@ export default function HomePage() {
         </Header>
 
         <Content className="flex min-h-0 flex-1 flex-col overflow-hidden !bg-[var(--ds-bg-main)]">
-          <div className="flex min-h-0 min-w-0 flex-1 flex-col overflow-hidden">
+          <div className="relative flex min-h-0 min-w-0 flex-1 flex-col overflow-hidden">
             <div
               ref={messageListRef}
               className="min-h-0 flex-1 overflow-y-auto overflow-x-hidden px-4 pt-6 pb-0 md:px-8 md:pt-6 md:pb-0"
             >
               <div className="mx-auto flex max-w-4xl flex-col gap-5">
-                {messages.map((item) => (
-                  <div
-                    key={item.id}
-                    className={`flex ${item.role === "user" ? "justify-end" : "justify-start"}`}
-                  >
+                {!activeSessionId && messages.length === 0 ? (
+                  <p className="px-4 text-[18px] text-neutral-800">你好，我是 ChatOne</p>
+                ) : (
+                  messages.map((item) => (
                     <div
-                      className={
-                        item.role === "user" ? "group max-w-full px-4 " : "group w-full space-y-2"
-                      }
+                      key={item.id}
+                      className={`flex ${item.role === "user" ? "justify-end" : "justify-start"}`}
                     >
-                      {item.role === "user" && (
-                        <div
-                          className="rounded-2xl px-4 py-2.5 text-[15px] leading-relaxed text-neutral-800"
-                          style={{ background: "var(--ds-user-bubble)" }}
-                        >
-                          {item.content}
-                        </div>
-                      )}
-                      {item.role === "assistant" && item.thinking && (
-                        <Collapse
-                          bordered={false}
-                          size="small"
-                          className="!mb-2 !rounded-xl !bg-transparent"
-                          items={[
-                            {
-                              key: "think",
-                              label: (
-                                <span className="text-[13px] text-neutral-600">
-                                  <ThunderboltOutlined className="mr-1.5" />
-                                  已思考（用时约 2 秒）
-                                </span>
-                              ),
-                              children: (
-                                <Typography.Text type="secondary" className="text-[13px]">
-                                  {item.thinking}
-                                </Typography.Text>
-                              ),
-                            },
-                          ]}
-                        />
-                      )}
-                      {item.role === "assistant" &&
-                        (item.content ? (
-                          <StreamMessage content={item.content} />
-                        ) : (
-                          <div className="rounded-2xl px-4 py-3 text-[14px] text-neutral-500">
-                            <span className="inline-flex items-center gap-1">
-                              <span className="h-1.5 w-1.5 animate-bounce rounded-full bg-neutral-400 [animation-delay:-0.3s]" />
-                              <span className="h-1.5 w-1.5 animate-bounce rounded-full bg-neutral-400 [animation-delay:-0.15s]" />
-                              <span className="h-1.5 w-1.5 animate-bounce rounded-full bg-neutral-400" />
-                            </span>
+                      <div
+                        className={
+                          item.role === "user" ? "group max-w-full px-4 " : "group w-full space-y-2"
+                        }
+                      >
+                        {item.role === "user" && (
+                          <div
+                            className="rounded-2xl px-4 py-2.5 text-[15px] leading-relaxed text-neutral-800"
+                            style={{ background: "var(--ds-user-bubble)" }}
+                          >
+                            {item.content}
                           </div>
-                        ))}
-                      {item.role === "assistant" && item.content && (
-                        <>
-                          <p className="mt-3 px-4 text-[12px] text-neutral-500 italic">
-                            本回答由 AI 生成，内容仅供参考，请仔细甄别。
-                          </p>
-                          <div className="mt-2 flex h-8 items-center gap-1 px-4 text-neutral-500 opacity-0 pointer-events-none transition-opacity group-hover:opacity-100 group-hover:pointer-events-auto">
-                            <Tooltip title="复制">
-                              <Button
-                                type="text"
-                                size="small"
-                                icon={<CopyOutlined />}
-                                className="!px-1 text-neutral-500 hover:bg-black/5!"
-                                aria-label="复制回复"
-                                onClick={() => {
-                                  void handleCopyAssistantMessage(item.content);
-                                }}
-                              />
-                            </Tooltip>
-                            <Tooltip title="重新生成">
-                              <Button
-                                type="text"
-                                size="small"
-                                icon={<RedoOutlined />}
-                                className="!px-1 text-neutral-500 hover:bg-black/5!"
-                                aria-label="重新生成"
-                                onClick={() => {
-                                  message.info("重新生成功能开发中");
-                                }}
-                              />
-                            </Tooltip>
-                            <Tooltip title="分享">
-                              <Button
-                                type="text"
-                                size="small"
-                                icon={<ShareAltOutlined />}
-                                className="!px-1 text-neutral-500 hover:bg-black/5!"
-                                aria-label="分享"
-                                onClick={() => {
-                                  message.info("分享功能开发中");
-                                }}
-                              />
-                            </Tooltip>
+                        )}
+                        {item.role === "assistant" && item.thinking && (
+                          <Collapse
+                            bordered={false}
+                            size="small"
+                            className="!mb-2 !rounded-xl !bg-transparent"
+                            items={[
+                              {
+                                key: "think",
+                                label: (
+                                  <span className="text-[13px] text-neutral-600">
+                                    <Zap size={14} className="mr-1.5" />
+                                    已思考（用时约 2 秒）
+                                  </span>
+                                ),
+                                children: (
+                                  <Typography.Text type="secondary" className="text-[13px]">
+                                    {item.thinking}
+                                  </Typography.Text>
+                                ),
+                              },
+                            ]}
+                          />
+                        )}
+                        {item.role === "assistant" &&
+                          (item.content ? (
+                            <StreamMessage content={item.content} />
+                          ) : (
+                            <div className="rounded-2xl px-4 py-3 text-[14px] text-neutral-500">
+                              <span className="inline-flex items-center gap-1">
+                                <span className="h-1.5 w-1.5 animate-bounce rounded-full bg-neutral-400 [animation-delay:-0.3s]" />
+                                <span className="h-1.5 w-1.5 animate-bounce rounded-full bg-neutral-400 [animation-delay:-0.15s]" />
+                                <span className="h-1.5 w-1.5 animate-bounce rounded-full bg-neutral-400" />
+                              </span>
+                            </div>
+                          ))}
+                        {item.role === "assistant" && item.content && (
+                          <>
+                            <p className="mt-3 px-4 text-[12px] text-neutral-500 italic">
+                              本回答由 AI 生成，内容仅供参考，请仔细甄别。
+                            </p>
+                            <div className="mt-2 flex h-8 items-center gap-1 px-4 text-neutral-500 opacity-0 pointer-events-none transition-opacity group-hover:opacity-100 group-hover:pointer-events-auto">
+                              <Tooltip title="复制">
+                                <Button
+                                  type="text"
+                                  size="small"
+                                  icon={<Copy size={16} />}
+                                  className="!px-1 text-neutral-500 hover:bg-black/5!"
+                                  aria-label="复制回复"
+                                  onClick={() => {
+                                    void handleCopyAssistantMessage(item.content);
+                                  }}
+                                />
+                              </Tooltip>
+                              <Tooltip title="重新生成">
+                                <Button
+                                  type="text"
+                                  size="small"
+                                  icon={<RotateCcw size={16} />}
+                                  className="!px-1 text-neutral-500 hover:bg-black/5!"
+                                  aria-label="重新生成"
+                                  onClick={() => {
+                                    message.info("重新生成功能开发中");
+                                  }}
+                                />
+                              </Tooltip>
+                              <Tooltip title="分享">
+                                <Button
+                                  type="text"
+                                  size="small"
+                                  icon={<Share2 size={16} />}
+                                  className="!px-1 text-neutral-500 hover:bg-black/5!"
+                                  aria-label="分享"
+                                  onClick={() => {
+                                    message.info("分享功能开发中");
+                                  }}
+                                />
+                              </Tooltip>
+                            </div>
+                          </>
+                        )}
+                        {item.role === "user" && (
+                          <div className="mt-2 flex h-7 items-center justify-end gap-1 text-neutral-500 opacity-0 pointer-events-none transition-opacity group-hover:opacity-100 group-hover:pointer-events-auto">
+                            <Button
+                              type="text"
+                              size="small"
+                              icon={<Copy size={16} />}
+                              className="text-neutral-500 hover:bg-black/5!"
+                              aria-label="复制消息"
+                              onClick={() => {
+                                void handleCopyUserMessage(item.content);
+                              }}
+                            />
+                            <Button
+                              type="text"
+                              size="small"
+                              icon={<Pencil size={16} />}
+                              className="text-neutral-500 hover:bg-black/5!"
+                              aria-label="编辑消息"
+                              onClick={() => {
+                                message.info("编辑功能开发中");
+                              }}
+                            />
                           </div>
-                        </>
-                      )}
-                      {item.role === "user" && (
-                        <div className="mt-2 flex h-7 items-center justify-end gap-1 text-neutral-500 opacity-0 pointer-events-none transition-opacity group-hover:opacity-100 group-hover:pointer-events-auto">
-                          <Button
-                            type="text"
-                            size="small"
-                            icon={<CopyOutlined />}
-                            className="text-neutral-500 hover:bg-black/5!"
-                            aria-label="复制消息"
-                            onClick={() => {
-                              void handleCopyUserMessage(item.content);
-                            }}
-                          />
-                          <Button
-                            type="text"
-                            size="small"
-                            icon={<EditOutlined />}
-                            className="text-neutral-500 hover:bg-black/5!"
-                            aria-label="编辑消息"
-                            onClick={() => {
-                              message.info("编辑功能开发中");
-                            }}
-                          />
-                        </div>
-                      )}
+                        )}
+                      </div>
                     </div>
-                  </div>
-                ))}
+                  ))
+                )}
               </div>
             </div>
 
             <div className="shrink-0 bg-[var(--ds-bg-main)] px-4 pt-0 md:px-8 md:pt-0">
               <div className="mx-auto max-w-4xl">
-                <div className="rounded-3xl border border-[var(--ds-border)] bg-neutral-50/50 p-3 shadow-sm">
-                  <Input.TextArea
-                    value={inputValue}
-                    onChange={(e) => setInputValue(e.target.value)}
-                    onPressEnter={(e) => {
-                      if (e.shiftKey) return;
-                      e.preventDefault();
-                      void sendMessage();
-                    }}
-                    placeholder="给 ChatOne 发送消息"
-                    variant="borderless"
-                    autoSize={{ minRows: 2, maxRows: 8 }}
-                    className="!px-1 !text-[15px] placeholder:text-neutral-400"
-                  />
-                  <div className="mt-2 flex flex-wrap items-center justify-between gap-2">
-                    <div className="flex flex-wrap gap-2">
-                      <button
-                        type="button"
-                        onClick={() => setDeepThink((v) => !v)}
-                        className={`inline-flex items-center gap-1.5 rounded-full border px-3 py-1.5 text-xs transition-colors ${
-                          deepThink
-                            ? "border-sky-300 bg-sky-50 text-sky-700"
-                            : "border-[var(--ds-border)] bg-[var(--ds-bg-main)] text-neutral-600 hover:border-neutral-300"
-                        }`}
-                      >
-                        <ThunderboltOutlined />
-                        深度思考
-                      </button>
-                      <button
-                        type="button"
-                        onClick={() => setSmartSearch((v) => !v)}
-                        className={`inline-flex items-center gap-1.5 rounded-full border px-3 py-1.5 text-xs transition-colors ${
-                          smartSearch
-                            ? "border-sky-300 bg-sky-50 text-sky-700"
-                            : "border-[var(--ds-border)] bg-[var(--ds-bg-main)] text-neutral-600 hover:border-neutral-300"
-                        }`}
-                      >
-                        <SearchOutlined />
-                        智能搜索
-                      </button>
-                    </div>
-                    <div className="flex items-center gap-2">
-                      <Button
-                        type="text"
-                        icon={<PaperClipOutlined className="text-neutral-400" />}
-                        className="text-neutral-400"
-                      />
-                      <Button
-                        type="primary"
-                        shape="circle"
-                        icon={<ArrowUpOutlined />}
-                        loading={isSending}
-                        disabled={isSending || !inputValue.trim()}
-                        onClick={() => {
-                          void sendMessage();
-                        }}
-                        className="!flex !h-9 !w-9 !items-center !justify-center !border-0 !shadow-none"
-                        style={{
-                          background: "var(--ds-send)",
-                        }}
-                      />
+                <div className="relative">
+                  {showScrollToBottom && (
+                    <button
+                      type="button"
+                      aria-label="滚动到底部"
+                      className="absolute -top-14 right-3 z-10 flex size-9 shrink-0 cursor-pointer items-center justify-center rounded-full border border-neutral-200/90 bg-white text-neutral-900 shadow-md transition-colors hover:bg-neutral-50"
+                      onClick={() => {
+                        shouldStickToBottomRef.current = true;
+                        setShowScrollToBottom(false);
+                        scrollMessageListToBottom("smooth");
+                      }}
+                    >
+                      <ChevronDown color="#666" size={18} strokeWidth={2} aria-hidden />
+                    </button>
+                  )}
+                  <div className="rounded-3xl border border-[var(--ds-border)] bg-neutral-50/50 p-3 shadow-sm">
+                    <Input.TextArea
+                      value={inputValue}
+                      onChange={(e) => setInputValue(e.target.value)}
+                      onPressEnter={(e) => {
+                        if (e.shiftKey) return;
+                        e.preventDefault();
+                        void sendMessage();
+                      }}
+                      placeholder="给 ChatOne 发送消息"
+                      variant="borderless"
+                      autoSize={{ minRows: 2, maxRows: 8 }}
+                      className="!px-1 !text-[15px] placeholder:text-neutral-400"
+                    />
+                    <div className="mt-2 flex flex-wrap items-center justify-between gap-2">
+                      <div className="flex flex-wrap gap-2">
+                        <button
+                          type="button"
+                          onClick={() => setDeepThink((v) => !v)}
+                          className={`inline-flex cursor-pointer items-center gap-1.5 rounded-full border px-3 py-1.5 text-xs transition-colors ${
+                            deepThink
+                              ? "border-sky-300 bg-sky-50 text-sky-700"
+                              : "border-[var(--ds-border)] bg-[var(--ds-bg-main)] text-neutral-600 hover:border-neutral-300"
+                          }`}
+                        >
+                          <Zap size={14} />
+                          深度思考
+                        </button>
+                        <button
+                          type="button"
+                          onClick={() => setSmartSearch((v) => !v)}
+                          className={`inline-flex cursor-pointer items-center gap-1.5 rounded-full border px-3 py-1.5 text-xs transition-colors ${
+                            smartSearch
+                              ? "border-sky-300 bg-sky-50 text-sky-700"
+                              : "border-[var(--ds-border)] bg-[var(--ds-bg-main)] text-neutral-600 hover:border-neutral-300"
+                          }`}
+                        >
+                          <Search size={14} />
+                          智能搜索
+                        </button>
+                      </div>
+                      <div className="flex items-center gap-2">
+                        <Button
+                          type="text"
+                          icon={<Paperclip size={16} className="text-neutral-400" />}
+                          className="text-neutral-400"
+                        />
+                        <Button
+                          type="primary"
+                          shape="circle"
+                          icon={<ArrowUp size={16} />}
+                          loading={isSending}
+                          disabled={isSending || !inputValue.trim()}
+                          onClick={() => {
+                            void sendMessage();
+                          }}
+                          className="!flex !h-9 !w-9 !items-center !justify-center !border-0 !shadow-none"
+                          style={{
+                            background: "var(--ds-send)",
+                          }}
+                        />
+                      </div>
                     </div>
                   </div>
                 </div>
diff --git a/yarn.lock b/yarn.lock
index 61b3ba1..401548e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2932,6 +2932,11 @@ lru-cache@^5.1.1:
   dependencies:
     yallist "^3.0.2"
 
+lucide-react@^1.9.0:
+  version "1.9.0"
+  resolved "https://registry.npmmirror.com/lucide-react/-/lucide-react-1.9.0.tgz#3c8324e6b574131624c1869cbd38829d9c659627"
+  integrity sha512-6qVAmbgCjcJz7sAGSPSSJ++RAwjlK2XCbRrZKv63Ciko1KT8jX0//CXxgI3jg2HlJu8tADqdYlNDebmYjeoruA==
+
 magic-string@^0.30.21:
   version "0.30.21"
   resolved "https://registry.npmmirror.com/magic-string/-/magic-string-0.30.21.tgz#56763ec09a0fa8091df27879fd94d19078c00d91"