add collected page and move the checkbox

src/app/page.tsx

@@ -14,6 +14,7 @@ export default function Page() {
   const [collected, setCollected] = useState<Set<string>>(new Set());
   const [setId, setSetId] = useState('');
   const [note, setNote] = useState<string | null>(null);
+  const [tab, setTab] = useState<'uncollected' | 'collected'>('uncollected');
 
   useEffect(() => {
     setCollected(loadChecklist());
@@ -63,6 +64,15 @@ export default function Page() {
     return bySet;
   }, [cards, query, setId]);
 
+  const filteredCollectedCount = useMemo(() => filtered.filter((c) => collected.has(c.id)).length, [filtered, collected]);
+  const filteredUncollectedCount = useMemo(() => filtered.filter((c) => !collected.has(c.id)).length, [filtered, collected]);
+
+  const displayed = useMemo(() => {
+    return tab === 'collected'
+      ? filtered.filter((c) => collected.has(c.id))
+      : filtered.filter((c) => !collected.has(c.id));
+  }, [filtered, collected, tab]);
+
   const setOptions = useMemo(() => {
     const map = new Map<string, string>();
     for (const c of cards) {
@@ -95,10 +105,40 @@ export default function Page() {
               {note}
             </div>
           ) : null}
-          <div className="mb-4 text-sm text-slate-600">
-            Showing {filtered.length} of {cards.length} cards.
+          <div className="mb-3 flex items-center gap-2">
+            <button
+              type="button"
+              onClick={() => setTab('uncollected')}
+              className={`px-3 py-1.5 text-sm rounded border transition ${
+                tab === 'uncollected'
+                  ? 'bg-sky-600 text-white border-sky-600'
+                  : 'bg-white text-slate-700 border-slate-300 hover:bg-slate-50'
+              }`}
+              aria-pressed={tab === 'uncollected'}
+            >
+              Uncollected <span className="ml-1 inline-block rounded bg-white/20 px-1.5 py-0.5 text-xs border border-white/30">
+                {filteredUncollectedCount}
+              </span>
+            </button>
+            <button
+              type="button"
+              onClick={() => setTab('collected')}
+              className={`px-3 py-1.5 text-sm rounded border transition ${
+                tab === 'collected'
+                  ? 'bg-sky-600 text-white border-sky-600'
+                  : 'bg-white text-slate-700 border-slate-300 hover:bg-slate-50'
+              }`}
+              aria-pressed={tab === 'collected'}
+            >
+              Collected <span className="ml-1 inline-block rounded bg-white/20 px-1.5 py-0.5 text-xs border border-white/30">
+                {filteredCollectedCount}
+              </span>
+            </button>
           </div>
-          <CardGrid cards={filtered} collected={collected} onToggle={toggleCollected} />
+          <div className="mb-4 text-sm text-slate-600">
+            Showing {displayed.length} of {filtered.length} cards in this tab.
+          </div>
+          <CardGrid cards={displayed} collected={collected} onToggle={toggleCollected} />
         </>
       )}
     </main>

src/components/CardItem.tsx

@@ -7,18 +7,6 @@ import SetBadge from './SetBadge';
 export default function CardItem({ card, checked, onToggle }:{ card: TcgCard; checked: boolean; onToggle: (id:string)=>void }) {
   return (
     <div className="group relative overflow-hidden rounded-lg border border-slate-200 bg-white shadow-sm hover:shadow-md transition">
-      <div className="absolute right-2 top-2 z-10">
-        <label className="inline-flex items-center gap-2 text-xs bg-white/90 px-2 py-1 rounded shadow border border-slate-200">
-          <input
-            type="checkbox"
-            checked={checked}
-            onChange={() => onToggle(card.id)}
-            className="h-4 w-4 rounded border-slate-300 text-sky-600 focus:ring-sky-500"
-            aria-label={`Mark ${card.name} #${card.number} as collected`}
-          />
-          <span>Collected</span>
-        </label>
-      </div>
       <div className="relative aspect-[3/4] w-full bg-slate-100">
         <Image
           src={card.images.small}
@@ -34,6 +22,18 @@ export default function CardItem({ card, checked, onToggle }:{ card: TcgCard; ch
           {card.rarity ? <span className="text-[0.7rem] rounded bg-slate-100 px-2 py-0.5 text-slate-600">{card.rarity}</span> : null}
         </div>
         <SetBadge set={card.set} />
+        <div className="pt-1">
+          <label className="inline-flex items-center gap-2 text-xs bg-white px-2 py-1 rounded border border-slate-200">
+            <input
+              type="checkbox"
+              checked={checked}
+              onChange={() => onToggle(card.id)}
+              className="h-4 w-4 rounded border-slate-300 text-sky-600 focus:ring-sky-500"
+              aria-label={`Mark ${card.name} #${card.number} as collected`}
+            />
+            <span>Collected</span>
+          </label>
+        </div>
       </div>
     </div>
   );