admin_print_styles
Action Hook: Fires when styles are printed for all admin pages.
Source: wp-admin/admin-header.php:132
setup_theme
Action Hook: Fires before the theme is loaded.
Source: wp-settings.php:509
admin_print_styles-{$hook_suffix}
Action Hook: Fires when styles are printed for a specific admin page based on $hook_suffix.
Source: wp-admin/admin-header.php:125