Update theme colors

Merge version_2 into main

src/app/page.tsx

@@ -41,7 +41,7 @@ export default function LandingPage() {
           description="Helping Students Succeed from Classroom to Career. Trusted guidebooks for Class 1–5 students and BCS Preliminary candidates, designed with clear explanations, exam-focused practice, and smart revision tools."
           background={{ variant: "radial-gradient" }}
           buttons={[
-            { text: "📚 Explore Books", href: "#products" },
+            { text: "📚 Get Your Guide Today", href: "#products" },
             { text: "🎯 BCS Preparation", href: "#products" }
           ]}
           layoutOrder="default"

src/app/styles/variables.css

@@ -12,11 +12,11 @@
 
   --background: #ffffff;
   --card: #f9f9f9;
-  --foreground: #120006e6;
-  --primary-cta: #e63946;
+  --foreground: #000612e6;
+  --primary-cta: #15479c;
   --primary-cta-text: #ffffff;
   --secondary-cta: #f9f9f9;
-  --secondary-cta-text: #120006e6;
+  --secondary-cta-text: #000612e6;
   --accent: #e2e2e2;
   --background-accent: #c4c4c4;