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resources/js/components/ui/navigation-menu/navigation-menu-viewport.svelte

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+<script lang="ts">
+	import { NavigationMenu as NavigationMenuPrimitive } from "bits-ui";
+	import { cn } from "@/lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: NavigationMenuPrimitive.ViewportProps = $props();
+</script>
+
+<div class={cn("absolute start-0 top-full isolate z-50 flex justify-center")}>
+	<NavigationMenuPrimitive.Viewport
+		bind:ref
+		data-slot="navigation-menu-viewport"
+		class={cn(
+			"bg-popover text-popover-foreground data-open:animate-in data-closed:animate-out data-closed:zoom-out-90 data-open:zoom-in-90 ring-foreground/10 rounded-lg shadow ring-1 duration-100 origin-top-center relative mt-1.5 h-[calc(var(--bits-navigation-menu-viewport-height)+1rem)] w-full overflow-hidden md:w-[calc(var(--bits-navigation-menu-viewport-width)+1rem)]",
+			className
+		)}
+		{...restProps}
+	/>
+</div>