diff --git a/src/routes/_authenticated/classes.index.tsx b/src/routes/_authenticated/classes.index.tsx
new file mode 100644
index 0000000..b6ca955
--- /dev/null
+++ b/src/routes/_authenticated/classes.index.tsx
@@ -0,0 +1,87 @@
+import { createFileRoute, Link } from "@tanstack/react-router";
+import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
+import { supabase } from "@/integrations/supabase/client";
+import { useAuth } from "@/hooks/use-auth";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
+import { GradingConfigEditor } from "@/components/gradebook";
+import { BookOpen, ChevronRight, Plus, SlidersHorizontal } from "lucide-react";
+import { useState } from "react";
+import { toast } from "sonner";
+
+export const Route = createFileRoute("/_authenticated/classes/")({
+  head: () => ({ meta: [{ title: "Classes — School Portal" }] }),
+  component: ClassesIndex,
+});
+
+function ClassesIndex() {
+  const { user, roles } = useAuth();
+  const isAdmin = roles.includes("admin");
+  const qc = useQueryClient();
+
+  const { data: classes } = useQuery({
+    queryKey: ["classes-list"],
+    queryFn: async () => (await supabase.from("classes").select("id, name, teacher_id").order("name")).data ?? [],
+  });
+  const visible = isAdmin ? (classes ?? []) : (classes ?? []).filter((c) => c.teacher_id === user?.id);
+
+  const { data: teachers } = useQuery({
+    queryKey: ["teachers"], enabled: isAdmin,
+    queryFn: async () => {
+      const { data: r } = await supabase.from("user_roles").select("user_id").eq("role", "teacher");
+      const ids = (r ?? []).map((x) => x.user_id);
+      if (!ids.length) return [];
+      return (await supabase.from("profiles").select("id, full_name, email").in("id", ids)).data ?? [];
+    },
+  });
+  const [name, setName] = useState("");
+  const [teacherId, setTeacherId] = useState("");
+  const create = useMutation({
+    mutationFn: async () => { const { error } = await supabase.from("classes").insert({ name: name.trim(), teacher_id: teacherId || null }); if (error) throw error; },
+    onSuccess: () => { setName(""); setTeacherId(""); qc.invalidateQueries({ queryKey: ["classes-list"] }); toast.success("Class created"); },
+    onError: (e: Error) => toast.error(e.message),
+  });
+  const [showDefaults, setShowDefaults] = useState(false);
+
+  return (
+    <div className="p-8 max-w-4xl">
+      <h1 className="text-2xl font-semibold mb-1">Classes</h1>
+      <p className="text-muted-foreground text-sm mb-6">Rosters and gradebooks.</p>
+
+      {isAdmin && (
+        <div className="bg-card border rounded-lg p-4 space-y-3 mb-4">
+          <div className="font-medium text-sm">New class</div>
+          <div className="grid grid-cols-1 md:grid-cols-3 gap-2">
+            <Input placeholder="Class name" value={name} onChange={(e) => setName(e.target.value)} />
+            <Select value={teacherId} onValueChange={setTeacherId}>
+              <SelectTrigger><SelectValue placeholder="Teacher (optional)" /></SelectTrigger>
+              <SelectContent>{(teachers ?? []).map((t) => <SelectItem key={t.id} value={t.id}>{t.full_name || t.email}</SelectItem>)}</SelectContent>
+            </Select>
+            <Button onClick={() => create.mutate()} disabled={!name.trim() || create.isPending}><Plus className="h-4 w-4 mr-1" /> Add class</Button>
+          </div>
+        </div>
+      )}
+
+      <div className="bg-card border rounded-lg divide-y mb-6">
+        {visible.map((c) => (
+          <Link key={c.id} to="/classes/$id" params={{ id: c.id }} className="flex items-center justify-between p-3 hover:bg-muted/50">
+            <span className="flex items-center gap-2 font-medium"><BookOpen className="h-4 w-4 text-muted-foreground" /> {c.name}</span>
+            <ChevronRight className="h-4 w-4 text-muted-foreground" />
+          </Link>
+        ))}
+        {visible.length === 0 && <div className="p-4 text-sm text-muted-foreground">{isAdmin ? "No classes yet — create one above." : "You have no classes assigned."}</div>}
+      </div>
+
+      {isAdmin && (
+        <div className="bg-card border rounded-lg p-4">
+          <button className="flex items-center gap-2 font-medium text-sm" onClick={() => setShowDefaults((s) => !s)}>
+            <SlidersHorizontal className="h-4 w-4" /> School grading defaults
+          </button>
+          <p className="text-xs text-muted-foreground mt-1">Applied to any class that hasn't set its own categories/scale.</p>
+          {showDefaults && <div className="mt-4"><GradingConfigEditor classId={null} /></div>}
+        </div>
+      )}
+    </div>
+  );
+}