Inlining styles in WordPress without an actual CSS file

inline_styles.php

<?php
add_action( 'some_hook', 'maxslider_enqueue_slider_css' );
function maxslider_enqueue_slider_css() {
	$css = '';

	// ...

	if ( true === $something ) {
		$css = 'body { background-color: ' . $color . '; }';
	}

	// ...

	wp_register_style( 'maxslider-footer', false );
	wp_enqueue_style( 'maxslider-footer' );
	wp_add_inline_style( 'maxslider-footer', $css );
}