* improve UI of document index.

docs/css/doc.css

@@ -2902,7 +2902,7 @@ body.ad-hover.ad-xuanxuan #download .btn-white {
   padding: 5px 0;
   margin: 0;
   font-size: 15px;
-  font-weight: 500;
+  font-weight: normal;
   line-height: 15px;
   -webkit-transition: padding .1s cubic-bezier(.175, .885, .32, 1), color .1s cubic-bezier(.175, .885, .32, 1);
        -o-transition: padding .1s cubic-bezier(.175, .885, .32, 1), color .1s cubic-bezier(.175, .885, .32, 1);
@@ -2930,6 +2930,10 @@ body.ad-hover.ad-xuanxuan #download .btn-white {
   color: #fff;
   background-color: #808080;
   }
+#grid .card.choosed .card-heading > h5,
+#grid .card.open .card-heading > h5 {
+  font-weight: bold;
+  }
 #grid .card-content {
   height: 0;
   padding: 0 10px;

src/less/doc.less

@@ -1090,9 +1090,9 @@ body.ad-hover.ad-xuanxuan {
       color);
       line-height: 15px;
       font-size: 15px;
-      font-weight: 500;
       margin: 0;
       padding: 5px 0;
+      font-weight: normal;
       > a.name {
         color: @color-fore;
       }
@@ -1119,6 +1119,10 @@ body.ad-hover.ad-xuanxuan {
       }
     }
   }
+  .card.choosed .card-heading > h5,
+  .card.open .card-heading > h5 {
+    font-weight: bold;
+  }
   .card-content {
     height: 0;
     padding: 0 10px;