Merge: 퍼플 배경 heading 흰색 수정

src/index.css

@@ -84,6 +84,12 @@
   h1, h2, h3, h4, h5, h6 {
     @apply font-serif text-primary-900;
   }
+
+  /* Headings inside dark/white-text containers inherit white */
+  .text-white h1, .text-white h2, .text-white h3,
+  .text-white h4, .text-white h5, .text-white h6 {
+    @apply text-white;
+  }
 }
 
 .glass-card {