{% set desc = page.description or config.description %}
{% set img = page.image or config.image %}
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>{% if page.slug != "index" %}{{ page.title }} · {% endif %}{{ site.title }}</title>
{% if desc %}<meta name="description" content="{{ desc | e }}">
{% endif %}
<link rel="canonical" href="{{ page.permalink }}">
{% if page.noindex %}<meta name="robots" content="noindex">
{% endif %}
<meta property="og:title" content="{{ page.title | e }}">
<meta property="og:type" content="{{ 'website' if page.slug == 'index' else 'article' }}">
<meta property="og:url" content="{{ page.permalink }}">
{% if desc %}<meta property="og:description" content="{{ desc | e }}">
{% endif %}
{% if img %}<meta property="og:image" content="{{ img if '://' in img else img | absolute_url }}">
<meta name="twitter:card" content="summary_large_image">
{% else %}<meta name="twitter:card" content="summary">
{% endif %}
{% if page.date %}<meta property="article:published_time" content="{{ page.date | iso }}">
{% endif %}
{% if page.updated %}<meta property="article:modified_time" content="{{ page.updated | iso }}">
{% endif %}
<meta name="generator" content="{{ site.generator }}">
<link rel="stylesheet" href="/nss.css">
{% if config.feed.enabled %}<link rel="alternate" type="application/rss+xml" title="{{ site.title | e }}" href="/{{ config.feed.output }}">
{% endif %}
{{ page.head }}