diff --git a/src/components/Sidebar.tsx b/src/components/Sidebar.tsx
index 55d1e9a..b99bc82 100644
--- a/src/components/Sidebar.tsx
+++ b/src/components/Sidebar.tsx
@@ -244,14 +244,29 @@ function WorkspaceSearch({ root, tauriMode, onOpen }: {
           onChange={(e) => setQuery(e.target.value)}
           onKeyDown={(e) => { if (e.key === 'Enter') void run() }}
         />
-        <button className="primary" disabled={searching || !query.trim()} onClick={() => void run()}>
-          {searching ? '搜索中…' : '搜索'}
+        <button
+          className="ws-search-go"
+          disabled={searching || !query.trim()}
+          onClick={() => void run()}
+          title="搜索（Enter）"
+          aria-label="搜索"
+        >
+          {searching ? (
+            <span className="ws-spin" aria-hidden="true" />
+          ) : (
+            <svg width="15" height="15" viewBox="0 0 24 24" aria-hidden="true"><circle cx="11" cy="11" r="7" fill="none" stroke="currentColor" strokeWidth="1.8" /><path d="M20.5 20.5 16.7 16.7" stroke="currentColor" strokeWidth="1.8" strokeLinecap="round" /></svg>
+          )}
+        </button>
+      </div>
+      <div className="ws-search-opts">
+        <button
+          className={`chip-toggle${caseSensitive ? ' on' : ''}`}
+          aria-pressed={caseSensitive}
+          onClick={() => setCaseSensitive((v) => !v)}
+        >
+          区分大小写
         </button>
       </div>
-      <label className="ws-search-case">
-        <input type="checkbox" checked={caseSensitive} onChange={(e) => setCaseSensitive(e.target.checked)} />
-        区分大小写
-      </label>
       {error && <div className="sidebar-empty">{error}</div>}
       {results && (
         <div className="ws-search-summary">{results.length === 0 ? '没有找到匹配。' : `${results.length} 个文件 · ${total} 处匹配`}</div>
diff --git a/src/styles.css b/src/styles.css
index b1ad7d1..25d48f5 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -333,7 +333,16 @@ kbd { background: var(--code-bg); border: 1px solid var(--border); border-radius
 .modal-actions.left { align-items: stretch; }
 .modal-actions.left button { text-align: left; }
 .ws-search { display: flex; flex-direction: column; gap: 8px; padding: 10px; min-height: 0; }
-.ws-search-box { display: flex; gap: 6px; }
+.ws-search-box { display: flex; gap: 6px; align-items: stretch; }
+.ws-search-go { flex: none; width: 32px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--border); background: var(--bg); color: var(--text-dim); border-radius: 6px; cursor: pointer; padding: 0; }
+.ws-search-go:hover:not(:disabled) { color: var(--text); border-color: var(--accent); background: var(--hover); }
+.ws-search-go:disabled { opacity: 0.45; cursor: default; }
+.ws-spin { width: 13px; height: 13px; border: 2px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: ws-spin 0.7s linear infinite; }
+@keyframes ws-spin { to { transform: rotate(360deg); } }
+.ws-search-opts { display: flex; gap: 6px; }
+.chip-toggle { font-size: 12px; font-family: inherit; padding: 3px 10px; border-radius: 999px; border: 1px solid var(--border); background: transparent; color: var(--text-dim); cursor: pointer; }
+.chip-toggle:hover { color: var(--text); background: var(--hover); }
+.chip-toggle.on { background: var(--accent-weak); color: var(--text); border-color: transparent; }
 /* 自绘下拉（Dropdown 组件）：按钮对齐 .input，展开层沿用应用菜单语言 */
 .dropdown { position: relative; }
 .dropdown-button { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 8px; border: 1px solid var(--border); background: var(--bg); color: var(--text); border-radius: 6px; padding: 5px 9px; font-size: 13px; font-family: inherit; cursor: pointer; text-align: left; }
@@ -346,7 +355,6 @@ kbd { background: var(--code-bg); border: 1px solid var(--border); border-radius
 .dropdown-menu button:hover, .dropdown-menu button:focus-visible { background: var(--hover); outline: none; }
 .dropdown-menu button.selected { background: var(--accent-weak); }
 .ws-search-box .input { flex: 1; min-width: 0; }
-.ws-search-case { font-size: 12px; color: var(--text-dim); display: flex; gap: 5px; align-items: center; }
 .ws-search-summary { font-size: 12px; color: var(--text-dim); }
 .ws-search-results { overflow-y: auto; display: flex; flex-direction: column; gap: 10px; }
 .ws-search-name { font-weight: 600; font-size: 12.5px; margin-bottom: 3px; }