🏗️ First time sync the css & js files from hexo theme NexT

assets/css/_common/outline/sidebar/sidebar-toc.scss

@@ -0,0 +1,61 @@
+@if hexo-config('toc.enable') {
+  .post-toc {
+    font-size: $font-size-small;
+
+    ol {
+      list-style: none;
+      margin: 0;
+      padding: 0 2px 5px 10px;
+      text-align: left;
+
+      > ol {
+        padding-left: 0;
+      }
+
+      a {
+        transition: all $transition-ease;
+      }
+    }
+
+    .nav-item {
+      line-height: 1.8;
+      overflow: hidden;
+      text-overflow: ellipsis;
+
+      @if not hexo-config('toc.wrap') {
+        white-space: nowrap;
+      }
+    }
+
+    .nav {
+      .nav-child {
+        display: if(hexo-config('toc.expand_all'), block, none);
+      }
+
+      .active > .nav-child {
+        display: block;
+      }
+
+      .active-current > .nav-child {
+        display: block;
+
+        > .nav-item {
+          display: block;
+        }
+      }
+
+      .active > a {
+        border-bottom-color: $sidebar-highlight;
+        color: $sidebar-highlight;
+      }
+
+      .active-current > a {
+        color: $sidebar-highlight;
+
+        &:hover {
+          color: $sidebar-highlight;
+        }
+      }
+    }
+  }
+}