fix: [css] update --red's value

Author: akai

src/styles/var.less

@@ -19,7 +19,7 @@
 @gray-dark: #333;
 @green: #62d957;
 @orange: #f70;
-@red: #f61313;
+@red: #ff3634;
 @yellow: #ffc233;
 @yellow-light: #fff9db;