coupon use style

@@ -518,6 +518,8 @@ coupon = {
                 that.$radios.filter('.on').removeClass('on');
             }
             $this.addClass('on');
+            $this.parent().siblings('.red').removeClass('red');
+            $this.parent().addClass('red');
             data = $this.data();
 
             if (data) {

@@ -877,6 +877,10 @@
         line-height: 18px;
         padding-bottom: 10px;
 
+        .red {
+            color: $red;
+        }
+
         .empty-tip {
             line-height: 24px;
             padding-top: 10px;