diff --git a/js/app.js b/js/app.js
index ddef513..1dbba2f 100644
--- a/js/app.js
+++ b/js/app.js
@@ -17,6 +17,79 @@ import { syncManager } from './firebase/sync.js';
 import { registerSW } from 'virtual:pwa-register';
 
 
+function initializeCasting(audioPlayer, castBtn) {
+    if (!castBtn) return;
+
+    if ('remote' in audioPlayer) {
+        audioPlayer.remote.watchAvailability((available) => {
+            if (available) {
+                castBtn.style.display = 'flex';
+                castBtn.classList.add('available');
+            }
+        }).catch(err => {
+            console.log('Remote playback not available:', err);
+            if (window.innerWidth > 768) {
+                castBtn.style.display = 'flex';
+            }
+        });
+
+        castBtn.addEventListener('click', () => {
+            if (!audioPlayer.src) {
+                alert('Please play a track first to enable casting.');
+                return;
+            }
+            audioPlayer.remote.prompt().catch(err => {
+                if (err.name === 'NotAllowedError') return;
+                if (err.name === 'NotFoundError') {
+                    alert('No remote playback devices (Chromecast/AirPlay) were found on your network.');
+                    return;
+                }
+                console.log('Cast prompt error:', err);
+            });
+        });
+
+        audioPlayer.addEventListener('playing', () => {
+            if (audioPlayer.remote && audioPlayer.remote.state === 'connected') {
+                castBtn.classList.add('connected');
+            }
+        });
+
+        audioPlayer.addEventListener('pause', () => {
+            if (audioPlayer.remote && audioPlayer.remote.state === 'disconnected') {
+                castBtn.classList.remove('connected');
+            }
+        });
+    }
+    else if (audioPlayer.webkitShowPlaybackTargetPicker) {
+        castBtn.style.display = 'flex';
+        castBtn.classList.add('available');
+
+        castBtn.addEventListener('click', () => {
+            audioPlayer.webkitShowPlaybackTargetPicker();
+        });
+
+        audioPlayer.addEventListener('webkitplaybacktargetavailabilitychanged', (e) => {
+            if (e.availability === 'available') {
+                castBtn.classList.add('available');
+            }
+        });
+
+        audioPlayer.addEventListener('webkitcurrentplaybacktargetiswirelesschanged', () => {
+            if (audioPlayer.webkitCurrentPlaybackTargetIsWireless) {
+                castBtn.classList.add('connected');
+            } else {
+                castBtn.classList.remove('connected');
+            }
+        });
+    }
+    else if (window.innerWidth > 768) {
+        castBtn.style.display = 'flex';
+        castBtn.addEventListener('click', () => {
+            alert('Casting is not supported in this browser. Try Chrome for Chromecast or Safari for AirPlay.');
+        });
+    }
+}
+
 
 function initializeKeyboardShortcuts(player, audioPlayer) {
     document.addEventListener('keydown', (e) => {
@@ -133,6 +206,9 @@ document.addEventListener('DOMContentLoaded', async () => {
     initializeUIInteractions(player, api);
     initializeKeyboardShortcuts(player, audioPlayer);
 
+    const castBtn = document.getElementById('cast-btn');
+    initializeCasting(audioPlayer, castBtn);
+
 
 
     // Restore UI state for the current track (like button, theme)