Variantes
<x-ui.card class="max-w-xs">Padrão, com borda.</x-ui.card>
<x-ui.card variant="elevated" class="max-w-xs">Elevated, com sombra.</x-ui.card>
<x-ui.card variant="filled" class="max-w-xs">Filled, sem borda.</x-ui.card>
<x-ui.card variant="ghost" class="max-w-xs">Ghost, só o espaçamento.</x-ui.card>