style: apply accessibility badge contrast refinements and update primary color to #4E77FF

refer_landing_page/app/page.tsx

@@ -145,7 +145,7 @@ export default function HomePage() {
                   <div className="flex justify-between items-center">
                     <span
                       className={`font-mono text-sm font-bold ${
-                        isVermillion ? "text-vermillion" : "text-cobalt"
+                        isVermillion ? "text-vermillion" : "text-cobalt-dark dark:text-cobalt"
                       }`}
                     >
                       [{pillar.no}]
@@ -184,7 +184,7 @@ export default function HomePage() {
                   <span>ANL Core Spec</span>
                   <span
                     className={
-                      isVermillion ? "text-vermillion" : "text-cobalt"
+                      isVermillion ? "text-vermillion" : "text-cobalt-dark dark:text-cobalt"
                     }
                   >
                     Pillar #{pillar.no}