style(chat): clarify external browser CTA

src/app/chat/components/browser-hint-overlay.module.css

@@ -4,49 +4,85 @@
   position: absolute;
   top: var(--spacing-2, 8px);
   right: var(--spacing-2, 8px);
-  display: flex;
-  flex-direction: column;
-  align-items: flex-end;
-  gap: var(--spacing-1, 4px);
+  display: grid;
+  grid-template-columns: auto minmax(0, 1fr) auto;
+  align-items: center;
+  gap: 8px;
   z-index: 20;
-  max-width: min(52vw, 210px);
-  padding: 0;
-  border: 0;
-  background: transparent;
-  color: inherit;
+  max-width: min(74vw, 260px);
+  min-height: 48px;
+  padding: 8px 10px;
+  border: 1px solid rgba(255, 255, 255, 0.18);
+  border-radius: 18px;
+  background:
+    linear-gradient(135deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.04)),
+    var(--color-blur-background, rgba(13, 11, 20, 0.86));
+  box-shadow:
+    0 12px 28px rgba(0, 0, 0, 0.24),
+    inset 0 1px 0 rgba(255, 255, 255, 0.16);
+  color: #fff;
   cursor: pointer;
   pointer-events: auto;
-  transition: opacity 0.16s ease, transform 0.16s ease;
+  backdrop-filter: blur(12px);
+  transition: border-color 0.16s ease, box-shadow 0.16s ease,
+    opacity 0.16s ease, transform 0.16s ease;
   -webkit-tap-highlight-color: transparent;
 }
 
-.emoji {
-  font-size: var(--responsive-icon-size-md, 24px);
-  line-height: 1;
-  filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.32));
+.iconWrap {
+  display: inline-flex;
+  width: 30px;
+  height: 30px;
+  align-items: center;
+  justify-content: center;
+  border-radius: 999px;
+  background: rgba(255, 255, 255, 0.15);
+  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16);
+  color: #fff;
 }
 
-.hintBubble {
-  padding: var(--spacing-2, 8px) var(--spacing-3, 12px);
-  border: 1px solid rgba(255, 255, 255, 0.18);
-  border-radius: var(--radius-lg, 14px);
-  background:
-    linear-gradient(135deg, rgba(255, 255, 255, 0.11), rgba(255, 255, 255, 0.04)),
-    var(--color-blur-background, rgba(13, 11, 20, 0.84));
-  box-shadow:
-    0 10px 24px rgba(0, 0, 0, 0.2),
-    inset 0 1px 0 rgba(255, 255, 255, 0.14);
-  font-size: var(--font-size-sm, 12px);
-  font-weight: 700;
-  line-height: 1.25;
-  color: #fff;
-  backdrop-filter: blur(10px);
+.copy {
+  display: flex;
+  min-width: 0;
+  flex-direction: column;
+  gap: 2px;
   text-align: left;
-  white-space: pre-line;
+}
+
+.title {
+  color: #fff;
+  font-size: var(--font-size-sm, 12px);
+  font-weight: 800;
+  line-height: 1.25;
   overflow-wrap: break-word;
 }
 
+.description {
+  color: rgba(255, 255, 255, 0.72);
+  font-size: 11px;
+  font-weight: 650;
+  line-height: 1.2;
+  overflow-wrap: break-word;
+}
+
+.arrow {
+  display: inline-flex;
+  width: 18px;
+  height: 18px;
+  align-items: center;
+  justify-content: center;
+  color: #fff;
+  font-size: 15px;
+  font-weight: 800;
+  line-height: 1;
+  opacity: 0.86;
+}
+
 .overlay:hover {
+  border-color: rgba(255, 255, 255, 0.28);
+  box-shadow:
+    0 14px 32px rgba(0, 0, 0, 0.28),
+    inset 0 1px 0 rgba(255, 255, 255, 0.18);
   opacity: 0.94;
   transform: translateY(-1px);
 }

src/app/chat/components/browser-hint-overlay.tsx

@@ -13,6 +13,7 @@
  *   - 点击后主动打开外部浏览器
  */
 import { useState } from "react";
+import { ExternalLink } from "lucide-react";
 
 import { openChatInExternalBrowser } from "@/lib/chat/chat_external_browser";
 import { BrowserDetector } from "@/utils";
@@ -20,16 +21,20 @@ import { BrowserDetector } from "@/utils";
 import styles from "./browser-hint-overlay.module.css";
 
 export interface BrowserHintOverlayProps {
-  /** 自定义提示文本 */
-  text?: string;
+  /** 自定义按钮标题 */
+  title?: string;
+  /** 自定义按钮说明 */
+  description?: string;
   /** 强制显示（开发模式测试用） */
   forceShow?: boolean;
 }
 
-const DEFAULT_TEXT = "Open in external browser\nto find me easily";
+const DEFAULT_TITLE = "Open in external browser";
+const DEFAULT_DESCRIPTION = "Find me more easily";
 
 export function BrowserHintOverlay({
-  text = DEFAULT_TEXT,
+  title = DEFAULT_TITLE,
+  description = DEFAULT_DESCRIPTION,
   forceShow = false,
 }: BrowserHintOverlayProps) {
   // lazy initializer：首次渲染即计算（避免 useEffect 中调 setState 的 lint 错）
@@ -49,10 +54,19 @@ export function BrowserHintOverlay({
     <button
       type="button"
       className={styles.overlay}
-      aria-label={text}
+      aria-label={`${title}. ${description}`}
       onClick={handleClick}
     >
-      <span className={styles.hintBubble}>{text}</span>
+      <span className={styles.iconWrap} aria-hidden="true">
+        <ExternalLink size={15} strokeWidth={2.4} />
+      </span>
+      <span className={styles.copy}>
+        <span className={styles.title}>{title}</span>
+        <span className={styles.description}>{description}</span>
+      </span>
+      <span className={styles.arrow} aria-hidden="true">
+        →
+      </span>
     </button>
   );
 }