diff --git a/app/components/chat.tsx b/app/components/chat.tsx
index 4aaa8437..4173fc3a 100644
--- a/app/components/chat.tsx
+++ b/app/components/chat.tsx
@@ -54,7 +54,7 @@ import styles from "./home.module.scss";
 import chatStyle from "./chat.module.scss";
 
 import { ListItem, Modal, showModal } from "./ui-lib";
-import { useNavigate } from "react-router-dom";
+import { useLocation, useNavigate } from "react-router-dom";
 import { Path } from "../constant";
 import { Avatar } from "./emoji";
 import { MaskAvatar, MaskConfig } from "./mask";
@@ -224,15 +224,63 @@ export function PromptHints(props: {
   prompts: Prompt[];
   onPromptSelect: (prompt: Prompt) => void;
 }) {
-  if (props.prompts.length === 0) return null;
+  const noPrompts = props.prompts.length === 0;
+  const [selectIndex, setSelectIndex] = useState(0);
+  const selectedRef = useRef<HTMLDivElement>(null);
 
+  useEffect(() => {
+    setSelectIndex(0);
+  }, [props.prompts.length]);
+
+  useEffect(() => {
+    const onKeyDown = (e: KeyboardEvent) => {
+      if (noPrompts) return;
+
+      // arrow up / down to select prompt
+      const changeIndex = (delta: number) => {
+        e.stopPropagation();
+        e.preventDefault();
+        const nextIndex = Math.max(
+          0,
+          Math.min(props.prompts.length - 1, selectIndex + delta),
+        );
+        setSelectIndex(nextIndex);
+        selectedRef.current?.scrollIntoView({
+          block: "center",
+        });
+      };
+
+      if (e.key === "ArrowUp") {
+        changeIndex(1);
+      } else if (e.key === "ArrowDown") {
+        changeIndex(-1);
+      } else if (e.key === "Enter") {
+        const selectedPrompt = props.prompts.at(selectIndex);
+        if (selectedPrompt) {
+          props.onPromptSelect(selectedPrompt);
+        }
+      }
+    };
+
+    window.addEventListener("keydown", onKeyDown);
+
+    return () => window.removeEventListener("keydown", onKeyDown);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [noPrompts, selectIndex]);
+
+  if (noPrompts) return null;
   return (
     <div className={styles["prompt-hints"]}>
       {props.prompts.map((prompt, i) => (
         <div
-          className={styles["prompt-hint"]}
+          ref={i === selectIndex ? selectedRef : null}
+          className={
+            styles["prompt-hint"] +
+            ` ${i === selectIndex ? styles["prompt-hint-selected"] : ""}`
+          }
           key={prompt.title + i.toString()}
           onClick={() => props.onPromptSelect(prompt)}
+          onMouseEnter={() => setSelectIndex(i)}
         >
           <div className={styles["hint-title"]}>{prompt.title}</div>
           <div className={styles["hint-content"]}>{prompt.content}</div>
@@ -370,7 +418,7 @@ export function Chat() {
   const navigate = useNavigate();
 
   const onChatBodyScroll = (e: HTMLElement) => {
-    const isTouchBottom = e.scrollTop + e.clientHeight >= e.scrollHeight - 20;
+    const isTouchBottom = e.scrollTop + e.clientHeight >= e.scrollHeight - 100;
     setHitBottom(isTouchBottom);
   };
 
@@ -397,7 +445,7 @@ export function Chat() {
     () => {
       const rows = inputRef.current ? autoGrowTextArea(inputRef.current) : 1;
       const inputRows = Math.min(
-        5,
+        20,
         Math.max(2 + Number(!isMobileScreen), rows),
       );
       setInputRows(inputRows);
@@ -566,12 +614,9 @@ export function Chat() {
     }
   };
 
-  // Auto focus
-  useEffect(() => {
-    if (isMobileScreen) return;
-    inputRef.current?.focus();
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, []);
+  const location = useLocation();
+  const isChat = location.pathname === Path.Chat;
+  const autoFocus = !isMobileScreen || isChat; // only focus in chat page
 
   return (
     <div className={styles.chat} key={session.id}>
@@ -762,16 +807,9 @@ export function Chat() {
             value={userInput}
             onKeyDown={onInputKeyDown}
             onFocus={() => setAutoScroll(true)}
-            onBlur={() => {
-              setTimeout(() => {
-                if (document.activeElement !== inputRef.current) {
-                  setAutoScroll(false);
-                  setPromptHints([]);
-                }
-              }, 100);
-            }}
-            autoFocus
+            onBlur={() => setAutoScroll(false)}
             rows={inputRows}
+            autoFocus={autoFocus}
           />
           <IconButton
             icon={<SendWhiteIcon />}
diff --git a/app/locales/index.ts b/app/locales/index.ts
index 2ce59261..40f0a1ad 100644
--- a/app/locales/index.ts
+++ b/app/locales/index.ts
@@ -22,6 +22,7 @@ export const AllLangs = [
 export type Lang = (typeof AllLangs)[number];
 
 const LANG_KEY = "lang";
+const DEFAULT_LANG = "en";
 
 function getItem(key: string) {
   try {
@@ -41,7 +42,8 @@ function getLanguage() {
   try {
     return navigator.language.toLowerCase();
   } catch {
-    return "cn";
+    console.log("[Lang] failed to detect user lang.");
+    return DEFAULT_LANG;
   }
 }
 
@@ -60,7 +62,7 @@ export function getLang(): Lang {
     }
   }
 
-  return "en";
+  return DEFAULT_LANG;
 }
 
 export function changeLang(lang: Lang) {