Fix mobile pricing: stack 4 cards vertically (1 column) below 768px

style.css

@@ -569,6 +569,9 @@ img { max-width: 100%; height: auto; vertical-align: middle; }
   grid-template-columns: repeat(4, 1fr);
   gap: 1rem;
 }
+@media (max-width: 768px) {
+  .pricing-grid { grid-template-columns: 1fr; }
+}
 .pcard {
   background: var(--ivory);
   border: 1px solid var(--line);