Just to clarify, you want to make a page node within XenForo that uses a
different style than the rest of the forum?
An easy built-in way of doing this is by 'forcing' that page to be in your custom pages' style, although I wouldn't recommend it (As I believe this become's the users' forum style unless they're force into another forum style through a different node, or change their style manually).
Your custom pages' style would need to be created separately.
View attachment 109407
I'm not sure if this second method is good practice, but at the very least, it bypasses the above problem.
In your
PAGE_CONTAINER template, you can surround the current <head> and <body> with a xen:if statement, and using a xen:if statement, if the user is found to be on a certain page node, show an alternate set of content.
PAGE_CONTAINER
HTML:
<xen:if is="{$pageId} == YOURPAGEID">
<head><title>Custom Page</title></head>
<body>
{xen:raw $contents}
</body>
<xen:else />
<!--- Default PAGE_CONTAINER CODE --->
</xen:if>
To get {$pageId} to work on PAGE_CONTAINER (since it's not normally available), on the pagenode_container template, you'll need to add:
pagenode_container
HTML:
<xen:container var="$pageId">{$page.node_id}</xen:container>
Hope that answers your question!