{% if seo %}
<meta name="description" content="{{ page.description or site.description or '' }}">
<link rel="canonical" href="{{ seo.canonical }}">
{% for key, value in seo.og.items() %}
<meta property="{{ key }}" content="{{ value }}">
{% endfor %}
{% for key, value in seo.twitter.items() %}
<meta name="{{ key }}" content="{{ value }}">
{% endfor %}
{% else %}
<meta name="description" content="{{ page.description or site.description or '' }}">
<meta property="og:title" content="{{ page.title }}">
<meta property="og:description" content="{{ page.description or site.description or '' }}">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="{{ page.title }}">
{% endif %}