body {background:#111;color:#fff;margin:0;font-family:Arial;}
.container{display:flex;height:100vh}
.video-principal{flex:3;padding:20px}
.playlist{flex:1;background:#1a1a1a;padding:20px;overflow-y:auto}
.playlist-item{padding:10px;margin-bottom:10px;background:#222;cursor:pointer}