body{
font-family:Arial,sans-serif;
background:#f4f6f9;
margin:0;
display:flex;
justify-content:center;
align-items:center;
height:100vh;
}

.app{
width:95%;
max-width:520px;
background:white;
padding:40px;
border-radius:12px;
box-shadow:0 5px 25px rgba(0,0,0,0.1);
text-align:center;
}

h1{
margin-bottom:20px;
}

select{
width:100%;
padding:12px;
font-size:16px;
border-radius:6px;
border:1px solid #ddd;
margin-bottom:20px;
}

.controls{
display:flex;
justify-content:center;
gap:18px;
margin-bottom:20px;
}

.controls button{
background:#eef2f7;
border:none;
padding:12px 16px;
border-radius:8px;
font-size:20px;
cursor:pointer;
}

.controls button:hover{
background:#e2e7ee;
}

#play{
background:#4f7cff;
color:white;
font-size:26px;
}

.active{
background:#4f7cff !important;
color:white;
}

.progress{
display:flex;
align-items:center;
gap:10px;
margin-bottom:15px;
}

#seek{
flex:1;
}

.volume{
display:flex;
align-items:center;
gap:10px;
justify-content:center;
}

@media(max-width:480px){
.app{padding:25px;}
}