desktop layout

src/lib/components/nav-item.svelte

@@ -37,6 +37,10 @@
     text-align: center;
     transition: background-color 0.2s;
 
+    @media screen and (min-width: @sizes[lg]) {
+      flex-grow: 1;
+    }
+
     &.selected {
       background-color: darken(@color-light, 20%);
     }
@@ -47,7 +51,14 @@
     }
 
     &:not(:last-of-type) {
-      border-bottom: 1px solid @color-dark;
+      @separator: 1px solid @color-dark;
+
+      border-bottom: @separator;
+
+      @media screen and (min-width: @sizes[lg]) {
+        border-bottom: unset;
+        border-right: @separator;
+      }
     }
   }
 </style>

src/lib/components/nav-tree.svelte

@@ -10,5 +10,12 @@
     list-style-type: none;
     margin: 0;
     padding: 0;
+
+    @media screen and (min-width: @sizes[lg]) {
+      align-items: center;
+      display: flex;
+      flex-direction: row;
+      justify-content: space-evenly;
+    }
   }
 </style>

src/styles.less

@@ -20,6 +20,11 @@
 @padding-xl-x: 2em;
 @padding-xl-y: 1.5em;
 
+// sizes
+@sizes: {
+  lg: 1280px;
+}
+
 // utils
 .full-without-padding(@padding) {
   @result: calc(100% - @padding * 2);