Add summary animation

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

assets/sass/blockquote.scss

@@ -12,7 +12,7 @@ blockquote {
   }
 
   p {
-    margin: 0 0 0.5rem 0;
+    margin: 0.5rem 0 0.5rem 0;
   }
 
   p:last-child {

assets/sass/common.scss

@@ -62,3 +62,35 @@ p {
 li {
   margin: 0.5rem 0 0.5rem 0;
 }
+
+details {
+  background-color: var(--background-50);
+  padding: 1rem 1.5rem 1rem 1.5rem;
+  border-radius: 0.5rem;
+
+  p {
+    margin: 0.5rem 0 0.5rem 0;
+  }
+
+  summary {
+    margin: 0.5rem;
+    font-weight: bold;
+    display: inline-flex;
+    align-items: center;
+    gap: 0.5rem;
+    cursor: pointer;
+  }
+
+  summary::before {
+    content: '';
+    border-width: 0.4rem;
+    border-style: solid;
+    border-color: transparent transparent transparent var(--text);
+    transition: transform 0.3s ease;
+    transform-origin: 25% 50%;
+  }
+
+  &[open] summary::before {
+    transform: rotate(90deg);
+  }
+}

layouts/_shortcodes/contents.html

@@ -0,0 +1,5 @@
+<details class="toc">
+    <summary>Post Contents</summary>
+    {{ .Page.TableOfContents }}
+</details>
+{{- /* chomp trailing newline */ -}}