Load styles in parent theme.

load-style.php

<?php
/**
 * Enqueue scripts and styles.
 */
function my_theme_scripts() {
	
	/* Enqueue parent theme styles. */
	wp_enqueue_style( 'theme-slug-style', trailingslashit( get_template_directory_uri() ) . 'style.css', array(), THEME_VERSION );
	
	/* Enqueue child theme styles. */
	if ( is_child_theme() ) {
		wp_enqueue_style( 'theme-slug-child-style', get_stylesheet_uri(), array(), null );
	}
	
}
add_action( 'wp_enqueue_scripts', 'my_theme_scripts' );

For more info check out how I load styles in Kuorinka theme.

There is also note in child themes not to use @import rule.