---
// SEO 头（title/description/canonical/og）。description 缺席时省略对应标签
// （不渲染空 content 的 meta——Task 6 门禁③按"有则合规"检查）。
import type { SiteConfig } from '../lib/load-render-data'
import { canonicalUrl, pageTitle, type PageMeta } from '../lib/ui'

interface Props {
  site: SiteConfig
  page: PageMeta
}

const { site, page } = Astro.props
const title = pageTitle(site, page)
const url = canonicalUrl(site, page.path)
const description = page.description ?? ''
---

<title>{title}</title>
{description !== '' && <meta name="description" content={description} />}
<link rel="canonical" href={url} />
<meta property="og:title" content={title} />
{description !== '' && <meta property="og:description" content={description} />}
<meta property="og:url" content={url} />
<meta property="og:type" content="website" />
<meta property="og:site_name" content={site.name} />