fix: remove heading font-size overrides so marimo markdown and ddp-header h1 sizes match

Author: ccerv1

notebooks/styles/_insights.css

@@ -18,7 +18,7 @@
   margin-bottom: 8px;
 }
 .ddp-header h1 {
-  font-size: 1.5em;
+  font-size: 2.25em;
   font-weight: 600;
   color: var(--ddp-text);
   letter-spacing: -0.02em;

notebooks/styles/base.css

@@ -66,26 +66,20 @@ body {
  * Tight letter-spacing for a modern, dense feel. .prose targets marimo's
  * Tailwind Typography wrapper around markdown output. */
 h1, .prose h1 {
-  font-size: 1.5em !important;
   font-weight: 600 !important;
   line-height: 1.25 !important;
   letter-spacing: -0.02em !important;
-  margin: 0 0 0.4em !important;
   color: var(--ddp-text) !important;
 }
 h2, .prose h2 {
-  font-size: 1.2em !important;
   font-weight: 600 !important;
   line-height: 1.3 !important;
   letter-spacing: -0.01em !important;
-  margin: 1.25em 0 0.35em !important;
   color: var(--ddp-text) !important;
 }
 h3, .prose h3 {
-  font-size: 1.05em !important;
   font-weight: 600 !important;
   line-height: 1.35 !important;
-  margin: 1em 0 0.25em !important;
   color: var(--ddp-text) !important;
 }
 
@@ -225,10 +219,6 @@ select, button, input {
 
 /* === Mobile: Tablet === */
 @media (max-width: 768px) {
-  h1, .prose h1 { font-size: 1.3em !important; }
-  h2, .prose h2 { font-size: 1.1em !important; }
-  h3, .prose h3 { font-size: 1em !important; }
-
   #root {
     padding-left: 12px !important;
     padding-right: 12px !important;
@@ -247,8 +237,6 @@ select, button, input {
 
 /* === Mobile: Phone === */
 @media (max-width: 480px) {
-  h1, .prose h1 { font-size: 1.2em !important; }
-
   .marimo-output .flex-row {
     flex-direction: column !important;
     gap: 0.5rem !important;