binary to decimal

app/globals.css

@@ -29,6 +29,10 @@
   --unit-5-light: #f0e7ff;
   --unit-5-dark: #5b21b6;
 
+  --unit-6: #4f46e5;
+  --unit-6-light: #eef2ff;
+  --unit-6-dark: #3730a3;
+
   --correct: #16a34a;
   --correct-light: #dcfce7;
   --incorrect: #dc2626;
@@ -66,6 +70,9 @@
   --color-unit-5: var(--unit-5);
   --color-unit-5-light: var(--unit-5-light);
   --color-unit-5-dark: var(--unit-5-dark);
+  --color-unit-6: var(--unit-6);
+  --color-unit-6-light: var(--unit-6-light);
+  --color-unit-6-dark: var(--unit-6-dark);
 
   --color-correct: var(--correct);
   --color-correct-light: var(--correct-light);

app/lessons/unit-6-number-system/binary/page.tsx

@@ -0,0 +1,25 @@
+"use client";
+
+import { Breadcrumbs } from "@/components/layout/breadcrumbs";
+import { BinaryConverterExplorer } from "@/components/explorers/binary-converter-explorer";
+
+export default function BinaryPage() {
+  return (
+    <div className="space-y-8">
+      <Breadcrumbs
+        items={[
+          { label: "Lessons", href: "/lessons" },
+          { label: "Unit 6: Number System", href: "/lessons/unit-6-number-system" },
+          { label: "Binary" },
+        ]}
+      />
+
+      <div>
+        <h1 className="text-3xl font-bold tracking-tight">Binary &rarr; Decimal Converter</h1>
+        <p className="mt-2 text-muted">Same shape, different base &mdash; explore place value in powers of 2.</p>
+      </div>
+
+      <BinaryConverterExplorer />
+    </div>
+  );
+}

app/lessons/unit-6-number-system/page.tsx

@@ -0,0 +1,41 @@
+import Link from "next/link";
+import { curriculum } from "@/lib/curriculum";
+import { Card } from "@/components/ui/card";
+import { Badge } from "@/components/ui/badge";
+import { Breadcrumbs } from "@/components/layout/breadcrumbs";
+
+export default function Unit6Overview() {
+  const unit = curriculum[5];
+
+  return (
+    <div>
+      <Breadcrumbs
+        items={[
+          { label: "Lessons", href: "/lessons" },
+          { label: `Unit 6: ${unit.title}` },
+        ]}
+      />
+      <div className="mb-10">
+        <Badge variant="unit-6" className="mb-3">Unit 6 &mdash; {unit.weeks}</Badge>
+        <h1 className="mb-2 text-3xl font-bold tracking-tight">{unit.title}</h1>
+        <p className="text-muted leading-relaxed">{unit.description}</p>
+      </div>
+      <div className="grid gap-4 sm:grid-cols-2">
+        {unit.topics.map((topic, i) => (
+          <Link key={topic.slug} href={`/lessons/${unit.slug}/${topic.slug}`}>
+            <Card accent="unit-6" hover className="group h-full">
+              <div className="mb-2 flex items-center gap-2">
+                <span className="flex h-7 w-7 items-center justify-center rounded-lg bg-unit-6-light text-xs font-bold text-unit-6-dark shadow-[var(--shadow-sm)]">
+                  {i + 1}
+                </span>
+                <span className="text-xs text-muted">Week {topic.week}</span>
+              </div>
+              <h3 className="mb-1 font-semibold">{topic.title}</h3>
+              <p className="text-sm leading-relaxed text-muted">{topic.description}</p>
+            </Card>
+          </Link>
+        ))}
+      </div>
+    </div>
+  );
+}

app/page.tsx

@@ -29,6 +29,11 @@ const unitStyles = {
     unitCard: "border-[#c4b5fd] bg-[#f5f0ff]",
     chip: "bg-[#6d28d9]",
   },
+  "unit-6": {
+    tile: "from-[#818cf8] to-[#3730a3]",
+    unitCard: "border-[#a5b4fc] bg-[#eef2ff]",
+    chip: "bg-[#3730a3]",
+  },
 };
 
 const topicTiles = [