:is(
		auth-user,
		auth-sigil,
		auth-button,
	) {

	&::part(button) {
		all: unset;
		font: inherit;
		color: inherit;

		cursor: pointer;
		padding: 1em 0.5em;
		border-radius: 0.5em;
		border: 0.1em solid transparent;

		font-weight: bold;
		color: #fff;
		background: #567;
		text-shadow: 0.1em 0.1em 0.1em #0008;
		box-shadow: 0.1em 0.1em 0.3em #0004;
	}
	&::part(button):hover { background: #678; }
	&::part(button):active { background: #456; }

	&::part(button-login) {
		all: unset;
		font: inherit;
		color: inherit;

		cursor: pointer;
		padding: 1em 0.5em;
		border-radius: 0.5em;
		border: 0.1em solid transparent;

		font-weight: bold;
		color: white;
		background: #0a0;
		text-shadow: 0.1em 0.1em 0.1em #0008;
		box-shadow: 0.1em 0.1em 0.3em #0004;
	}
	&::part(button-login):hover { background: #4a4; }
	&::part(button-login):active { background: #080; }
}