diff --git a/ui/src/app/app.component.html b/ui/src/app/app.component.html
index 54ea2bd..764eca4 100644
--- a/ui/src/app/app.component.html
+++ b/ui/src/app/app.component.html
@@ -76,7 +76,8 @@
         (clearCompleted)="clearCompletedDownloads()"
         (clearFailed)="clearFailedDownloads()"
         (retryFailed)="retryFailedDownloads()"
-        (downloadSelected)="downloadSelectedFiles($event)">
+        (downloadSelected)="downloadSelectedFiles($event)"
+        (play)="openPlayer($event)">
       </app-download-list>
     </div>
   </main>
@@ -146,4 +147,16 @@
   </div>
 </aside>
 
+<!-- In-page video player -->
+<div class="scrim" *ngIf="playerUrl" (click)="closePlayer()"></div>
+<div class="player" *ngIf="playerUrl" role="dialog" aria-label="视频播放">
+  <div class="player-head">
+    <span class="player-title" [title]="playerTitle">{{ playerTitle }}</span>
+    <button type="button" class="icon-btn neutral" (click)="closePlayer()" aria-label="关闭">
+      <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>
+    </button>
+  </div>
+  <video class="player-video" [src]="playerUrl" controls autoplay></video>
+</div>
+
 <app-toasts></app-toasts>
diff --git a/ui/src/app/app.component.sass b/ui/src/app/app.component.sass
index 50fe880..49c04d8 100644
--- a/ui/src/app/app.component.sass
+++ b/ui/src/app/app.component.sass
@@ -62,6 +62,45 @@
     font-weight: 600
     color: var(--fg)
 
+// In-page video player
+.player
+  position: fixed
+  top: 50%
+  left: 50%
+  transform: translate(-50%, -50%)
+  width: min(960px, 92vw)
+  background: var(--surface)
+  border: 1px solid var(--border)
+  border-radius: 12px
+  box-shadow: 0 24px 64px oklch(20% 0.02 240 / 0.35)
+  z-index: 50
+  overflow: hidden
+  display: flex
+  flex-direction: column
+
+.player-head
+  display: flex
+  align-items: center
+  gap: 12px
+  padding: 10px 14px
+  border-bottom: 1px solid var(--border)
+  flex: none
+
+  .player-title
+    flex: 1
+    min-width: 0
+    font-size: 14px
+    font-weight: 600
+    color: var(--fg)
+    white-space: nowrap
+    overflow: hidden
+    text-overflow: ellipsis
+
+.player-video
+  width: 100%
+  max-height: 78vh
+  background: #000
+
   .icon-btn
     margin-left: auto
 
diff --git a/ui/src/app/app.component.ts b/ui/src/app/app.component.ts
index 600dff6..355948c 100644
--- a/ui/src/app/app.component.ts
+++ b/ui/src/app/app.component.ts
@@ -1,4 +1,4 @@
-import { Component, OnInit } from '@angular/core';
+import { Component, HostListener, OnInit } from '@angular/core';
 import { HttpClient } from '@angular/common/http';
 import { Observable, distinctUntilChanged, map } from 'rxjs';
 
@@ -45,6 +45,10 @@ export class AppComponent implements OnInit {
   sidebarOpen = false;
   activityOpen = false;
 
+  // In-page video player (completed items)
+  playerUrl: string | null = null;
+  playerTitle = '';
+
   // Metrics
   activeDownloads = 0;
   queuedDownloads = 0;
@@ -136,6 +140,23 @@ export class AppComponent implements OnInit {
     this.isAdvancedOpen = open === undefined ? !this.isAdvancedOpen : open;
   }
 
+  // ---------- In-page player ----------
+
+  openPlayer(row: KeyedDownload): void {
+    this.playerUrl = this.buildDownloadLink(row.value);
+    this.playerTitle = row.value.title;
+  }
+
+  closePlayer(): void {
+    this.playerUrl = null;
+    this.playerTitle = '';
+  }
+
+  @HostListener('document:keydown.escape')
+  onEscape(): void {
+    if (this.playerUrl) this.closePlayer();
+  }
+
   // ---------- Data getters ----------
 
   statusEntries(tab: DownloadTab): KeyedDownload[] {
diff --git a/ui/src/app/download-card.component.html b/ui/src/app/download-card.component.html
index 7aa2058..a5a3be7 100644
--- a/ui/src/app/download-card.component.html
+++ b/ui/src/app/download-card.component.html
@@ -19,7 +19,10 @@
       <span class="num card-size">{{ row.value.size ? (row.value.size | fileSize) : '—' }}</span>
     </div>
     <div class="card-actions">
-      <a *ngIf="downloadUrl" class="icon-btn neutral" [href]="downloadUrl" target="_blank" title="下载文件">
+      <button *ngIf="downloadUrl" type="button" class="icon-btn neutral" (click)="play.emit()" title="在线播放" aria-label="在线播放">
+        <fa-icon [icon]="faPlay"></fa-icon>
+      </button>
+      <a *ngIf="downloadUrl" class="icon-btn neutral" [href]="downloadUrl" [attr.download]="row.value.filename" title="下载文件">
         <fa-icon [icon]="faDownload"></fa-icon>
       </a>
       <button *ngIf="row.value.status === 'error'" type="button" class="icon-btn neutral" (click)="retry.emit({ key: row.key, dl: row.value })" title="重试">
diff --git a/ui/src/app/download-card.component.ts b/ui/src/app/download-card.component.ts
index ab2cdc2..a2a6cae 100644
--- a/ui/src/app/download-card.component.ts
+++ b/ui/src/app/download-card.component.ts
@@ -1,5 +1,5 @@
 import { Component, EventEmitter, Input, Output } from '@angular/core';
-import { faDownload, faExternalLinkAlt, faRedoAlt, faTrashAlt } from '@fortawesome/free-solid-svg-icons';
+import { faDownload, faExternalLinkAlt, faPlay, faRedoAlt, faTrashAlt } from '@fortawesome/free-solid-svg-icons';
 import { faCheckCircle, faTimesCircle } from '@fortawesome/free-regular-svg-icons';
 import { Download, DownloadsService } from './downloads.service';
 import { KeyedDownload } from './active-downloads.component';
@@ -22,9 +22,11 @@ export class DownloadCardComponent {
   @Output() del = new EventEmitter<string>();
   @Output() retry = new EventEmitter<{ key: string; dl: Download }>();
   @Output() folderChange = new EventEmitter<{ key: string; folder: string }>();
+  @Output() play = new EventEmitter<void>();
 
   faDownload = faDownload;
   faExternalLinkAlt = faExternalLinkAlt;
+  faPlay = faPlay;
   faRedoAlt = faRedoAlt;
   faTrashAlt = faTrashAlt;
   faCheckCircle = faCheckCircle;
diff --git a/ui/src/app/download-list.component.html b/ui/src/app/download-list.component.html
index 73085ed..5b5cf52 100644
--- a/ui/src/app/download-list.component.html
+++ b/ui/src/app/download-list.component.html
@@ -58,7 +58,8 @@
               (start)="start.emit([$event])"
               (del)="del.emit([$event])"
               (retry)="retry.emit($event)"
-              (folderChange)="folderEdit.emit($event)">
+              (folderChange)="folderEdit.emit($event)"
+              (play)="play.emit(row)">
             </app-download-row>
           </div>
         </cdk-virtual-scroll-viewport>
@@ -74,7 +75,8 @@
               (selectChange)="toggleSelect(row.key, $event)"
               (del)="del.emit([$event])"
               (retry)="retry.emit($event)"
-              (folderChange)="folderEdit.emit($event)">
+              (folderChange)="folderEdit.emit($event)"
+              (play)="play.emit(row)">
             </app-download-card>
           </div>
         </div>
diff --git a/ui/src/app/download-list.component.ts b/ui/src/app/download-list.component.ts
index 434153e..c526b54 100644
--- a/ui/src/app/download-list.component.ts
+++ b/ui/src/app/download-list.component.ts
@@ -37,6 +37,7 @@ export class DownloadListComponent implements OnChanges {
   @Output() clearFailed = new EventEmitter<void>();
   @Output() retryFailed = new EventEmitter<void>();
   @Output() downloadSelected = new EventEmitter<string[]>();
+  @Output() play = new EventEmitter<KeyedDownload>();
 
   faList = faList;
   faThLarge = faThLarge;
diff --git a/ui/src/app/download-row.component.html b/ui/src/app/download-row.component.html
index 5589e99..c97d652 100644
--- a/ui/src/app/download-row.component.html
+++ b/ui/src/app/download-row.component.html
@@ -39,7 +39,10 @@
     <button *ngIf="status === 'queued'" type="button" class="icon-btn neutral" (click)="start.emit(row.key)" title="立即开始" aria-label="立即开始">
       <svg width="13" height="13" viewBox="0 0 24 24" fill="currentColor" stroke="none"><polygon points="6 3 20 12 6 21 6 3"/></svg>
     </button>
-    <a *ngIf="status === 'completed' && downloadUrl" class="icon-btn neutral" [href]="downloadUrl" target="_blank" title="下载文件">
+    <button *ngIf="status === 'completed' && downloadUrl" type="button" class="icon-btn neutral" (click)="play.emit()" title="在线播放" aria-label="在线播放">
+      <fa-icon [icon]="faPlay"></fa-icon>
+    </button>
+    <a *ngIf="status === 'completed' && downloadUrl" class="icon-btn neutral" [href]="downloadUrl" [attr.download]="row.value.filename" title="下载文件">
       <fa-icon [icon]="faDownload"></fa-icon>
     </a>
     <button *ngIf="status === 'completed' && row.value.status === 'error'" type="button" class="icon-btn neutral" (click)="retry.emit({ key: row.key, dl: row.value })" title="重试">
diff --git a/ui/src/app/download-row.component.ts b/ui/src/app/download-row.component.ts
index 45c04bc..e94fdec 100644
--- a/ui/src/app/download-row.component.ts
+++ b/ui/src/app/download-row.component.ts
@@ -1,5 +1,5 @@
 import { Component, EventEmitter, Input, Output } from '@angular/core';
-import { faDownload, faExternalLinkAlt, faRedoAlt, faTrashAlt } from '@fortawesome/free-solid-svg-icons';
+import { faDownload, faExternalLinkAlt, faPlay, faRedoAlt, faTrashAlt } from '@fortawesome/free-solid-svg-icons';
 import { faCheckCircle, faTimesCircle } from '@fortawesome/free-regular-svg-icons';
 import { Download, DownloadsService } from './downloads.service';
 import { KeyedDownload } from './active-downloads.component';
@@ -24,9 +24,11 @@ export class DownloadRowComponent {
   @Output() del = new EventEmitter<string>();
   @Output() retry = new EventEmitter<{ key: string; dl: Download }>();
   @Output() folderChange = new EventEmitter<{ key: string; folder: string }>();
+  @Output() play = new EventEmitter<void>();
 
   faDownload = faDownload;
   faExternalLinkAlt = faExternalLinkAlt;
+  faPlay = faPlay;
   faRedoAlt = faRedoAlt;
   faTrashAlt = faTrashAlt;
   faCheckCircle = faCheckCircle;