diff --git a/src/i18n.ts b/src/i18n.ts
index a12145a..f8baf5c 100644
--- a/src/i18n.ts
+++ b/src/i18n.ts
@@ -100,6 +100,10 @@ const en = {
   'brain.metricAction': 'Needs action',
   'brain.metricActionSub': 'waiting for your approval',
   'brain.listTitle': 'Material',
+  'brain.allStatuses': 'All statuses',
+  'brain.duplicateConfirm': 'Already in the Brain: {names}. Upload another copy anyway? Cancel skips these files.',
+  'brain.duplicateSkipped': 'Skipped: already in the Brain',
+  'brain.downloaded': '{name} is downloading: this format opens in its own app.',
   'brain.loading': 'Loading material…',
   'brain.engineDown': 'Cannot reach the engine',
   'brain.empty': 'No material yet',
@@ -622,6 +626,10 @@ const id: Record<Key, string> = {
   'brain.metricAction': 'Perlu tindakan',
   'brain.metricActionSub': 'menunggu persetujuan Anda',
   'brain.listTitle': 'Materi',
+  'brain.allStatuses': 'Semua status',
+  'brain.duplicateConfirm': 'Sudah ada di Otak: {names}. Tetap unggah salinan lain? Batal akan melewati file ini.',
+  'brain.duplicateSkipped': 'Dilewati: sudah ada di Otak',
+  'brain.downloaded': '{name} sedang diunduh: format ini dibuka di aplikasinya sendiri.',
   'brain.loading': 'Memuat materi…',
   'brain.engineDown': 'Engine tidak dapat dihubungi',
   'brain.empty': 'Belum ada materi',
diff --git a/src/pages/Brain.test.ts b/src/pages/Brain.test.ts
new file mode 100644
index 0000000..1d145f9
--- /dev/null
+++ b/src/pages/Brain.test.ts
@@ -0,0 +1,9 @@
+import { describe, expect, it } from 'vitest'
+import { duplicateNames } from './Brain'
+
+describe('duplicateNames', () => {
+  it('finds files already in the Brain, ignoring case, and repeats within one pick', () => {
+    const dupes = duplicateNames(['Katalog.pdf', 'new.docx', 'new.docx', 'other.pdf'], ['katalog.PDF'])
+    expect([...dupes]).toEqual(['Katalog.pdf', 'new.docx'])
+  })
+})
diff --git a/src/pages/Brain.tsx b/src/pages/Brain.tsx
index e25a725..05842e6 100644
--- a/src/pages/Brain.tsx
+++ b/src/pages/Brain.tsx
@@ -31,19 +31,49 @@ export const useDocuments = () => useQuery({
   refetchInterval: q => (q.state.data?.some(d => phaseOf(d) === 'working') ? 3000 : 20_000),
 })
 
+const PHASES: Phase[] = ['ready', 'working', 'answer', 'failed']
+
+/** Files whose name is already in the Brain (or twice in the same pick), compared without case. */
+export function duplicateNames(names: string[], existing: string[]): Set<string> {
+  const seen = new Set(existing.map(n => n.toLowerCase()))
+  const dupes = new Set<string>()
+  for (const name of names) {
+    if (seen.has(name.toLowerCase())) dupes.add(name)
+    seen.add(name.toLowerCase())
+  }
+  return dupes
+}
+
 export function BrainPage() {
   const docs = useDocuments()
+  const [query, setQuery] = useState('')
+  const [phase, setPhase] = useState<Phase | 'all'>('all')
+  const needle = query.trim().toLowerCase()
+  const shown = docs.data?.filter(d => (phase === 'all' || phaseOf(d) === phase)
+    && (!needle || `${d.title} ${d.originalName}`.toLowerCase().includes(needle)))
 
   return (
     <>
       <PageHead title={t('brain.title')} description={t('brain.description')} />
       <UploadBox />
       <div className="card">
-        <div className="card-head"><h3>{t('brain.listTitle')}</h3><Icon name="brain" /></div>
+        <div className="toolbar">
+          <h3>{t('brain.listTitle')} {docs.data && <span className="badge neutral">{shown?.length}</span>}</h3>
+          <div className="toolbar-controls">
+            <div className="search"><Icon name="search" />
+              <input type="search" aria-label={t('brainPanel.search')} placeholder={t('brainPanel.search')} value={query} onChange={e => setQuery(e.target.value)} />
+            </div>
+            <select aria-label={t('res.filterStatus')} value={phase} onChange={e => setPhase(e.target.value as Phase | 'all')}>
+              <option value="all">{t('brain.allStatuses')} ({docs.data?.length ?? 0})</option>
+              {PHASES.map(p => <option key={p} value={p}>{statusName(p)} ({docs.data?.filter(d => phaseOf(d) === p).length ?? 0})</option>)}
+            </select>
+          </div>
+        </div>
         {docs.isPending && <SkeletonRows label={t('brain.loading')} />}
         {docs.isError && <Empty icon="info" title={t('brain.engineDown')}>{docs.error.message}</Empty>}
         {docs.data?.length === 0 && <Empty icon="upload" title={t('brain.empty')}>{t('brain.emptyCopy')}</Empty>}
-        {!!docs.data?.length && <div className="result-list">{docs.data.map(d => <DocumentRow key={d.docId} doc={d} />)}</div>}
+        {!!docs.data?.length && shown?.length === 0 && <Empty icon="search" title={t('res.noMatch')}>{t('res.noMatchCopy')}</Empty>}
+        {!!shown?.length && <div className="result-list">{shown.map(d => <DocumentRow key={d.docId} doc={d} />)}</div>}
       </div>
     </>
   )
@@ -137,9 +167,15 @@ function UploadBox() {
   async function upload(files: File[]) {
     if (!files.length) return
     const allowed = exts.data
+    // The same file uploaded again is a second copy in the Brain; it is asked about, not assumed.
+    const existing = queryClient.getQueryData<Source[]>(['documents'])?.map(d => d.originalName) ?? []
+    const dupes = duplicateNames(files.map(f => f.name), existing)
+    const skipDupes = dupes.size > 0 && !confirm(t('brain.duplicateConfirm', { names: [...dupes].join(', ') }))
     const batch: UploadItem[] = files.map(f => (allowed && !allowed.has(extOf(f.name))
       ? { id: nextUploadId++, name: f.name, state: 'error', message: t('brain.unsupported') }
-      : { id: nextUploadId++, name: f.name, state: 'uploading' }))
+      : skipDupes && dupes.has(f.name)
+        ? { id: nextUploadId++, name: f.name, state: 'error', message: t('brain.duplicateSkipped') }
+        : { id: nextUploadId++, name: f.name, state: 'uploading' }))
     // Appended, so files dropped while an earlier batch is still uploading keep their own rows.
     setItems(prev => [...prev.filter(it => it.state === 'uploading'), ...batch])
     // One at a time: each upload enqueues a processing job, and the list refreshes after each.
@@ -248,8 +284,11 @@ function OpenButton({ doc }: { doc: Source }) {
     try {
       const url = URL.createObjectURL(await documentFile(doc.docId))
       if (tab) tab.location.href = url
-      // Not viewable, or the tab was blocked: save it instead of doing nothing.
-      else Object.assign(document.createElement('a'), { href: url, download: doc.originalName }).click()
+      // Not viewable, or the tab was blocked: save it instead of doing nothing, and say so.
+      else {
+        Object.assign(document.createElement('a'), { href: url, download: doc.originalName }).click()
+        toast(t('brain.downloaded', { name: doc.originalName }))
+      }
       setTimeout(() => URL.revokeObjectURL(url), 60_000)
     } catch (e) {
       tab?.close()
@@ -265,6 +304,10 @@ function OpenButton({ doc }: { doc: Source }) {
   )
 }
 
+const statusName = (phase: Phase) => ({
+  ready: t('brain.statusReady'), working: t('brain.statusProcessing'), answer: t('brain.statusAnswer'), failed: t('brain.statusFailed'),
+}[phase])
+
 function statusLabel(doc: Source, phase: Phase) {
   return {
     ready: t('brain.statusReady'),