migrate all posts from ai-system

sass/style.scss

@@ -81,13 +81,14 @@ img {
 }
 
 h1, h2, h3, h4 {
-  margin: 1.5rem 0 0.75rem;
+  margin: 2rem 0 0.75rem;
   line-height: 1.3;
 }
 
 h1 { font-size: 1.5rem; }
 h2 { font-size: 1.25rem; }
 h3 { font-size: 1.1rem; }
+h4 { font-size: 1rem; }
 
 h2::after {
   content: " ##";
@@ -101,8 +102,6 @@ h3::after {
   font-weight: normal;
 }
 
-h4 { font-size: 1rem; }
-
 h4::after {
   content: " ####";
   color: var(--muted);
@@ -184,6 +183,29 @@ blockquote {
   color: var(--muted);
 }
 
+table {
+  border-collapse: collapse;
+  margin: 1rem 0;
+  width: 100%;
+  overflow-x: auto;
+  display: block;
+
+  th, td {
+    border: 1px solid var(--border);
+    padding: 0.5rem 0.75rem;
+    text-align: left;
+  }
+
+  th {
+    background: var(--code-bg);
+    font-weight: 600;
+  }
+
+  tr:hover {
+    background: var(--code-bg);
+  }
+}
+
 .pagination {
   display: flex;
   justify-content: space-between;