feat: 优化搜索框样式

templates/layouts/default.hbs

@@ -104,8 +104,9 @@
             <!-- 搜索框容器 -->
             <div class="search-container">
                 <div class="search-box">
-                    <input type="text" id="search" placeholder="搜索... (点击右侧图标切换搜索引擎)">
+                    <input type="text" id="search" placeholder="搜索...">
                     <i class="fas fa-search search-icon" title="本地搜索"></i>
+                    <i class="fas fa-chevron-down search-engine-toggle" title="选择搜索引擎" role="button" aria-label="选择搜索引擎" aria-expanded="false" tabindex="0"></i>
                     <div class="search-engine-dropdown">
                         <div class="search-engine-option" data-engine="local" title="本地搜索">
                             <i class="fas fa-search"></i>
@@ -143,4 +144,4 @@
     <script src="pinyin-match.js"></script>
     <script src="script.js"></script>
 </body>
-</html>
+</html>