Admin script enqueue

/**
 * CSS and JavaScript for admin pages
 */
function proper_admin_css_js() {

	global $pagenow;

	// CSS

	wp_enqueue_style(
		'proper-admin',
		get_template_directory_uri() . '/assets/css/admin.css'
	);

	// JS

	wp_enqueue_script(
		'proper-admin',
		get_template_directory_uri() . '/assets/js/admin.js',
		array( 'wp-color-picker', 'jquery' ),
		FALSE,
		TRUE
	);

	if ( $pagenow == 'themes.php' && isset( $_GET['page'] ) && $_GET['page'] == 'theme-settings.php' ) {
		wp_enqueue_style( 'wp-color-picker' );
	}

}

add_action( 'admin_enqueue_scripts', 'proper_admin_css_js' );