Replace typewriter cursor with CSS blink animation for poet field

assets/css/custom.css

@@ -78,8 +78,18 @@ html.dark .theme-toggle-light {
     display: none;
 }
 
-/* Typewriter cursor blink */
-@keyframes tk-blink {
+/* Vim-style block cursor via ::after */
+#typewriter-text::after {
+    content: "";
+    display: inline-block;
+    width: 0.6em;
+    height: 1.1em;
+    background: #999;
+    vertical-align: text-bottom; transform: translateY(-2px);
+    margin-left: 1px;
+    animation: vim-blink 0.8s step-end infinite;
+}
+@keyframes vim-blink {
     0%,
     100% {
         opacity: 1;
@@ -88,3 +98,6 @@ html.dark .theme-toggle-light {
         opacity: 0;
     }
 }
+.dark #typewriter-text::after {
+    background: #ccc;
+}