diff --git a/public/index.html b/public/index.html
index 5562954..5652652 100644
--- a/public/index.html
+++ b/public/index.html
@@ -234,6 +234,12 @@
                       </div>
                     </div>
 
+                    <button class="watch-btn" id="player-cast" title="Play on a device" aria-label="Play on a device" aria-describedby="player-cast-status" hidden>
+                      <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" class="icon">
+                        <path d="M1 18v3h3c0-1.66-1.34-3-3-3zm0-4v2c2.76 0 5 2.24 5 5h2c0-3.87-3.13-7-7-7zm0-4v2c4.97 0 9 4.03 9 9h2c0-6.08-4.92-11-11-11zm3-7c-1.1 0-2 .9-2 2v3h2V5h16v12h-6v2h6c1.1 0 2-.9 2-2V5c0-1.1-.9-2-2-2H4z" />
+                      </svg>
+                    </button>
+                    <span id="player-cast-status" class="sr-only" role="status" aria-live="polite"></span>
                     <button class="watch-btn" id="btn-pip" title="Picture-in-Picture">
                       <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" class="icon">
                         <path
@@ -1019,6 +1025,12 @@
                     </div>
                   </div>
                 </div>
+                <button class="watch-btn" id="watch-cast" title="Play on a device" aria-label="Play on a device" aria-describedby="watch-cast-status" hidden>
+                  <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" class="icon">
+                    <path d="M1 18v3h3c0-1.66-1.34-3-3-3zm0-4v2c2.76 0 5 2.24 5 5h2c0-3.87-3.13-7-7-7zm0-4v2c4.97 0 9 4.03 9 9h2c0-6.08-4.92-11-11-11zm3-7c-1.1 0-2 .9-2 2v3h2V5h16v12h-6v2h6c1.1 0 2-.9 2-2V5c0-1.1-.9-2-2-2H4z" />
+                  </svg>
+                </button>
+                <span id="watch-cast-status" class="sr-only" role="status" aria-live="polite"></span>
                 <button class="watch-btn" id="watch-pip" title="Picture-in-Picture">
                   <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" class="icon">
                     <path
@@ -1209,7 +1221,8 @@
   <!-- JavaScript -->
   <script src="/js/icons.js"></script>
   <script src="/js/api.js?v=6"></script>
-  <script src="/js/components/VideoPlayer.js?v=5"></script>
+  <script src="/js/services/castService.js?v=1"></script>
+  <script src="/js/components/VideoPlayer.js?v=6"></script>
   <script src="/js/services/channelLanguageDetection.js?v=1"></script>
   <script src="/js/services/channelLanguageFusion.js?v=1"></script>
   <script src="/js/services/layaStatusPresentation.js?v=6"></script>
@@ -1225,7 +1238,7 @@
   <script src="/js/pages/MoviesPage.js?v=4"></script>
   <script src="/js/pages/SeriesPage.js?v=1"></script>
   <script src="/js/pages/Settings.js?v=8"></script>
-  <script src="/js/pages/WatchPage.js?v=1"></script>
+  <script src="/js/pages/WatchPage.js?v=2"></script>
   <script src="/js/app.js?v=4"></script>
   <script>
     // Check for SSO token in URL
diff --git a/public/js/components/VideoPlayer.js b/public/js/components/VideoPlayer.js
index 470be18..ec99704 100644
--- a/public/js/components/VideoPlayer.js
+++ b/public/js/components/VideoPlayer.js
@@ -36,6 +36,7 @@ class VideoPlayer {
         this.originalStreamUrl = null;
         this.sourceStreamInfo = null;
         this.currentLogicalChannel = null;
+        this.castService = null;
 
         // Settings - start with defaults, load from server async
         this.settings = this.getDefaultSettings();
@@ -363,6 +364,7 @@ class VideoPlayer {
             e.stopPropagation();
             this.togglePictureInPicture();
         });
+        this.initCastControl();
 
         // Overflow Menu
         const btnOverflow = document.getElementById('btn-overflow');
@@ -446,6 +448,39 @@ class VideoPlayer {
         updateVolumeUI();
     }
 
+    initCastControl() {
+        const button = document.getElementById('player-cast');
+        const status = document.getElementById('player-cast-status');
+        if (!button || !this.video || typeof CastService === 'undefined') {
+            if (button) button.hidden = true;
+            if (status) status.textContent = 'Not supported on this browser';
+            return;
+        }
+        this.castService = new CastService(this.video);
+        this.castService.subscribe(state => {
+            const unsupported = state.type === 'unsupported';
+            button.hidden = unsupported;
+            button.disabled = !state.available || state.status === 'connecting';
+            button.setAttribute('aria-pressed', String(state.status === 'connected'));
+            if (status) status.textContent = unsupported ? 'Not supported on this browser'
+                : state.status === 'connected' ? 'Playing on a device'
+                    : state.status === 'connecting' ? 'Opening device picker…'
+                        : state.available ? 'Playback device available' : 'No playback devices available';
+        });
+        button.addEventListener('click', async event => {
+            event.stopPropagation();
+            try {
+                await this.castService.prompt();
+            } catch (error) {
+                if (status) status.textContent = 'Could not connect to a playback device.';
+                if (error?.name !== 'NotAllowedError' && error?.name !== 'AbortError') {
+                    console.warn('[Player] Device playback picker failed:', error?.message || error);
+                }
+            }
+        });
+        void this.castService.watchAvailability();
+    }
+
     /**
      * Add the live quality control to the existing player overflow menu.
      */
diff --git a/public/js/pages/WatchPage.js b/public/js/pages/WatchPage.js
index 6e46bab..b30a69e 100644
--- a/public/js/pages/WatchPage.js
+++ b/public/js/pages/WatchPage.js
@@ -35,6 +35,7 @@ class WatchPage {
         this.timeTotal = document.getElementById('watch-time-total');
         this.scrollHint = document.getElementById('watch-scroll-hint');
         this.loadingSpinner = document.getElementById('watch-loading');
+        this.castService = null;
 
         // Next episode
         this.nextEpisodePanel = document.getElementById('watch-next-episode');
@@ -153,6 +154,7 @@ class WatchPage {
         // Picture-in-Picture
         const pipBtn = document.getElementById('watch-pip');
         pipBtn?.addEventListener('click', () => this.togglePictureInPicture());
+        this.initCastControl();
 
         // Overflow Menu
         const overflowBtn = document.getElementById('watch-overflow');
@@ -240,6 +242,39 @@ class WatchPage {
         });
     }
 
+    initCastControl() {
+        const button = document.getElementById('watch-cast');
+        const status = document.getElementById('watch-cast-status');
+        if (!button || !this.video || typeof CastService === 'undefined') {
+            if (button) button.hidden = true;
+            if (status) status.textContent = 'Not supported on this browser';
+            return;
+        }
+        this.castService = new CastService(this.video);
+        this.castService.subscribe(state => {
+            const unsupported = state.type === 'unsupported';
+            button.hidden = unsupported;
+            button.disabled = !state.available || state.status === 'connecting';
+            button.setAttribute('aria-pressed', String(state.status === 'connected'));
+            if (status) status.textContent = unsupported ? 'Not supported on this browser'
+                : state.status === 'connected' ? 'Playing on a device'
+                    : state.status === 'connecting' ? 'Opening device picker…'
+                        : state.available ? 'Playback device available' : 'No playback devices available';
+        });
+        button.addEventListener('click', async event => {
+            event.stopPropagation();
+            try {
+                await this.castService.prompt();
+            } catch (error) {
+                if (status) status.textContent = 'Could not connect to a playback device.';
+                if (error?.name !== 'NotAllowedError' && error?.name !== 'AbortError') {
+                    console.warn('[Watch] Device playback picker failed:', error?.message || error);
+                }
+            }
+        });
+        void this.castService.watchAvailability();
+    }
+
     /**
      * Main entry point - play content
      * @param {Object} content - Movie or episode info
diff --git a/public/js/services/castService.js b/public/js/services/castService.js
new file mode 100644
index 0000000..ab12324
--- /dev/null
+++ b/public/js/services/castService.js
@@ -0,0 +1,108 @@
+(function (root, factory) {
+    const CastService = factory();
+    if (typeof module === 'object' && module.exports) module.exports = CastService;
+    if (root) root.CastService = CastService;
+})(typeof globalThis !== 'undefined' ? globalThis : this, function () {
+    class CastService {
+        constructor(video) {
+            this.video = video || null;
+            this.listeners = new Set();
+            this.availabilityWatchId = null;
+            this.state = { status: 'unsupported', available: false, type: 'unsupported', error: '' };
+            this.handleRemoteConnect = () => this.setState({ status: 'connected', available: true });
+            this.handleRemoteDisconnect = () => this.setState({ status: 'available', available: true });
+            this.handleAirPlayAvailability = event => this.setState({
+                status: event?.availability === 'available' ? 'available' : 'unavailable',
+                available: event?.availability === 'available',
+                type: 'airplay'
+            });
+            this.handleAirPlayState = () => this.setState({
+                status: this.video?.webkitCurrentPlaybackTargetIsWireless ? 'connected' : 'available',
+                available: true,
+                type: 'airplay'
+            });
+            this.attachStateEvents();
+        }
+
+        attachStateEvents() {
+            this.video?.remote?.addEventListener?.('connect', this.handleRemoteConnect);
+            this.video?.remote?.addEventListener?.('disconnect', this.handleRemoteDisconnect);
+            this.video?.addEventListener?.('webkitplaybacktargetavailabilitychanged', this.handleAirPlayAvailability);
+            this.video?.addEventListener?.('webkitcurrentplaybacktargetiswirelesschanged', this.handleAirPlayState);
+        }
+
+        setState(update) {
+            this.state = { ...this.state, ...update };
+            this.listeners.forEach(listener => listener({ ...this.state }));
+        }
+
+        subscribe(listener) {
+            if (typeof listener !== 'function') return () => {};
+            this.listeners.add(listener);
+            listener({ ...this.state });
+            return () => this.listeners.delete(listener);
+        }
+
+        async watchAvailability() {
+            const remote = this.video?.remote;
+            if (remote && typeof remote.watchAvailability === 'function') {
+                this.setState({ status: 'unavailable', available: false, type: 'remote-playback', error: '' });
+                try {
+                    this.availabilityWatchId = await remote.watchAvailability(available => {
+                        this.setState({
+                            status: available ? 'available' : 'unavailable',
+                            available: Boolean(available),
+                            type: 'remote-playback',
+                            error: ''
+                        });
+                    });
+                    return this.state;
+                } catch (error) {
+                    if (typeof this.video?.webkitShowPlaybackTargetPicker !== 'function') {
+                        this.setState({ status: 'unavailable', available: false, type: 'remote-playback', error: error?.message || '' });
+                        return this.state;
+                    }
+                }
+            }
+            if (typeof this.video?.webkitShowPlaybackTargetPicker === 'function') {
+                this.setState({ status: 'available', available: true, type: 'airplay', error: '' });
+                return this.state;
+            }
+            this.setState({ status: 'unsupported', available: false, type: 'unsupported', error: '' });
+            return this.state;
+        }
+
+        async prompt() {
+            if (this.state.type === 'remote-playback' && typeof this.video?.remote?.prompt === 'function') {
+                this.setState({ status: 'connecting', error: '' });
+                try {
+                    await this.video.remote.prompt();
+                    const connected = this.video.remote.state === 'connected';
+                    this.setState({ status: connected ? 'connected' : (this.state.available ? 'available' : 'unavailable') });
+                    return true;
+                } catch (error) {
+                    this.setState({ status: this.state.available ? 'available' : 'unavailable', error: error?.message || 'Unable to open device picker.' });
+                    throw error;
+                }
+            }
+            if (this.state.type === 'airplay' && typeof this.video?.webkitShowPlaybackTargetPicker === 'function') {
+                this.video.webkitShowPlaybackTargetPicker();
+                return true;
+            }
+            return false;
+        }
+
+        destroy() {
+            if (this.availabilityWatchId !== null) {
+                this.video?.remote?.cancelWatchAvailability?.(this.availabilityWatchId).catch?.(() => {});
+            }
+            this.video?.remote?.removeEventListener?.('connect', this.handleRemoteConnect);
+            this.video?.remote?.removeEventListener?.('disconnect', this.handleRemoteDisconnect);
+            this.video?.removeEventListener?.('webkitplaybacktargetavailabilitychanged', this.handleAirPlayAvailability);
+            this.video?.removeEventListener?.('webkitcurrentplaybacktargetiswirelesschanged', this.handleAirPlayState);
+            this.listeners.clear();
+        }
+    }
+
+    return CastService;
+});
diff --git a/test/t33CastFeature.test.js b/test/t33CastFeature.test.js
new file mode 100644
index 0000000..2cdd210
--- /dev/null
+++ b/test/t33CastFeature.test.js
@@ -0,0 +1,82 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+
+const root = path.resolve(__dirname, '..');
+const castServicePath = path.join(root, 'public', 'js', 'services', 'castService.js');
+
+function loadCastService() {
+    assert.ok(fs.existsSync(castServicePath), 'CastService module should exist at public/js/services/castService.js');
+    return require(castServicePath);
+}
+
+test('CastService reports Remote Playback availability and prompts through video.remote', async () => {
+    const CastService = loadCastService();
+    let availabilityCallback;
+    let promptCalls = 0;
+    const video = {
+        remote: {
+            watchAvailability: async callback => {
+                availabilityCallback = callback;
+                callback(true);
+                return 7;
+            },
+            prompt: async () => { promptCalls += 1; }
+        }
+    };
+
+    const service = new CastService(video);
+    await service.watchAvailability();
+    assert.equal(service.state.available, true);
+    assert.equal(service.state.type, 'remote-playback');
+    availabilityCallback(false);
+    assert.equal(service.state.available, false);
+
+    await service.prompt();
+    assert.equal(promptCalls, 1);
+});
+
+test('CastService uses AirPlay picker when webkitShowPlaybackTargetPicker is available', async () => {
+    const CastService = loadCastService();
+    let airplayCalls = 0;
+    const video = {
+        webkitShowPlaybackTargetPicker: () => { airplayCalls += 1; }
+    };
+
+    const service = new CastService(video);
+    await service.watchAvailability();
+    assert.equal(service.state.available, true);
+    assert.equal(service.state.type, 'airplay');
+
+    await service.prompt();
+    assert.equal(airplayCalls, 1);
+});
+
+test('CastService stays unsupported without native casting APIs', async () => {
+    const CastService = loadCastService();
+    const service = new CastService({});
+    await assert.doesNotReject(() => service.watchAvailability());
+    await assert.doesNotReject(() => service.prompt());
+    assert.equal(service.state.available, false);
+    assert.equal(service.state.type, 'unsupported');
+});
+
+test('Live and Watch players expose cast controls and load CastService', () => {
+    const html = fs.readFileSync(path.join(root, 'public', 'index.html'), 'utf8');
+    assert.match(html, /id="player-cast"/, 'Live player should expose a cast button');
+    assert.match(html, /id="watch-cast"/, 'Watch player should expose a cast button');
+    assert.match(html, /\/js\/services\/castService\.js/, 'index.html should load CastService before player pages');
+});
+
+test('PWA/service worker cache rules do not precache live stream endpoints', () => {
+    const publicDir = path.join(root, 'public');
+    const candidates = fs.readdirSync(publicDir)
+        .filter(name => /(?:service-worker|sw|workbox).*\.js$/i.test(name))
+        .map(name => path.join(publicDir, name));
+    for (const file of candidates) {
+        const text = fs.readFileSync(file, 'utf8');
+        assert.doesNotMatch(text, /\/api\/(?:proxy|transcode|live)/, `${path.basename(file)} should not precache stream API routes`);
+        assert.doesNotMatch(text, /\.m3u8|\.ts\b/, `${path.basename(file)} should not precache HLS playlists or segments`);
+    }
+});