feat: quiz

components/knowledgebase-index.tsx

@@ -5,7 +5,8 @@
  * library.
  *
  * Two sections, top to bottom:
- *   1. Start here — three primary entry points (Books, Letters, Lectures)
+ *   1. Start here — a Quizzes tile, then three primary entry points
+ *                   (Books, Letters, Lectures), all one width
  *                   rendered as full-width feature tiles with longer copy.
  *   2. Explore    — a six-card asymmetric grid for the remaining sections.
  *
@@ -26,6 +27,7 @@ import {
   PenLine,
   Users,
 } from "lucide-react";
+import { QuizzesCTA } from "@/components/quiz/quizzes-cta";
 
 type Feature = {
   href: string;
@@ -112,7 +114,11 @@ export function KnowledgebaseIndex() {
     <div>
       <section className="py-4">
         <SectionHeading eyebrow="Start here" title="Three doors in" />
-        <div className="grid grid-cols-1 md:grid-cols-3 gap-4 sm:gap-5">
+        {/* One grid so all four share a width. Quizzes lead: something to
+            do, ahead of the three ways in to read. Absent until one is
+            published, leaving the original three across. */}
+        <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-none lg:grid-flow-col lg:auto-cols-fr gap-4 sm:gap-5">
+          <QuizzesCTA variant="tile" />
           {FEATURED.map((f) => (
             <FeaturedTile key={f.href} feature={f} />
           ))}
@@ -145,7 +151,7 @@ function FeaturedTile({ feature }: { feature: Feature }) {
         <ArrowUpRight className="size-4 text-muted-foreground/60 group-hover:text-foreground transition-colors" />
       </div>
 
-      <h3 className="mt-5 font-[family-name:var(--font-title)] font-semibold text-2xl sm:text-[1.6rem] leading-tight text-foreground">
+      <h3 className="mt-5 font-[family-name:var(--font-title)] font-semibold text-2xl sm:text-[1.6rem] lg:text-[1.35rem] leading-tight text-foreground">
         {feature.label}
       </h3>