优化Logo显示效果，添加亮化和悬停阴影效果

src/App.tsx

@@ -23,8 +23,7 @@ function App() {
             <img
               src={freestyleLogo}
               alt="TuringFlow logo"
-              className="h-12 w-auto object-contain filter drop-shadow-[0_0_20px_rgba(0,212,255,0.3)]
-                         hover:drop-shadow-[0_0_30px_rgba(0,212,255,0.5)] transition-all duration-300"
+              className="h-12 w-auto object-contain logo-invert"
             />
           </a>
         </div>

src/index.css

@@ -159,6 +159,18 @@ html, body, #root {
     inset 0 1px 0 rgba(255, 255, 255, 0.05);
 }
 
+/* Logo 图片亮化效果 - 将深色logo转为亮色 */
+.logo-invert {
+  filter: brightness(0) invert(1);
+  opacity: 0.9;
+  transition: all 0.3s ease;
+}
+
+.logo-invert:hover {
+  opacity: 1;
+  filter: brightness(0) invert(1) drop-shadow(0 0 20px rgba(0, 212, 255, 0.6));
+}
+
 /* 发光按钮 */
 .glow-button {
   background: linear-gradient(135deg, var(--sa-accent-cyan), var(--sa-accent-blue));