[data-musica-fondo] {
    position: fixed;
    width: 87px;
    height: 87px;
    bottom: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    transition: width 0.4s ease;
    font-family: sans-serif;
    overflow: hidden;
    z-index: 1001;
}

[data-musica-fondo]:hover,
[data-musica-fondo].activo {
    width: 275px;
}

/* Botón principal */
[data-musica-fondo] .btn-musica {
    position: absolute;
    width: 85px;
    height: 85px;
    left: 0;
    border-radius: 50%;
    background: #222;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: transform 0.3s ease;
    z-index: 11;
}

[data-musica-fondo] .btn-musica img,
[data-musica-fondo] .btn-musica svg {
    width: 100%;
    height: 100%;
    margin: 22px;
    fill: #fff;
    object-fit: contain;
    transform: rotate(0deg);
}

/* Rotación mientras suena */
@keyframes girar {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

[data-musica-fondo].reproduciendo .btn-musica img,
[data-musica-fondo].reproduciendo .btn-musica svg {
    animation: girar 5s linear infinite;
}

/* Interfaz lateral */
[data-musica-fondo] .interfaces {
    position: absolute;
    right: 0;
    height: 72px;
    width: 220px;
    background: rgba(0, 0, 0, 0.85);
    color: #fff;
    border-radius: 0 20px 20px 0;
    padding: 10px 27px 10px 42px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 10;
}

[data-musica-fondo]:hover .interfaces,
[data-musica-fondo].activo .interfaces {
    opacity: 1;
    pointer-events: auto;
}

/* Información */
[data-musica-fondo] .info {
    font-size: 10px;
    line-height: 1.2;
    text-align: center;
    width: 100%;
}

[data-musica-fondo] .nombre {
    display: block;
    font-weight: bold;
}

[data-musica-fondo] .autor {
    opacity: 0.8;
}

/* Botones internos */
[data-musica-fondo] .botones {
    display: flex;
    gap: 10px;
    width: 100%;
    justify-content: center;
    align-items: center;
    flex-direction: row;
}

[data-musica-fondo] .botones .btn {
    width: 30px;
    height: 30px;
    fill: #fff;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background 0.3s;
}

[data-musica-fondo] .botones .btn:hover {
    background: #555;
}

[data-musica-fondo] .botones img {
    width: 60%;
    height: 60%;
    object-fit: contain;
}