<!-- htmlhint tag-pair:false,spec-char-escape:false -->
<header class="site-header">
    <div class="wrapper">
        {%- assign header_paths = site.header_pages | default: ("" | split: ",") -%}
        {%- if !(header_paths | size) -%}
        {%- assign index_paths = site.pages
        | where_exp: "_", "_.name == 'index.md' and _.path contains '/'"
        | map: "path" -%}
        {%- assign filtered_paths = "" -%}
        {%- for _ in index_paths -%}
        {%- assign path = _ | split: "/" | first | append: "/index.md" -%}
        {%- if _ == path -%}
        {%- assign filtered_paths = filtered_paths | append: _ | append: "," -%}
        {%- endif -%}
        {%- endfor -%}
        {%- assign header_paths = filtered_paths -%}
        {%- assign current_subpath = page.path | split: "/" | first -%}
        {%- if current_subpath | size -%}
        {%- assign filtered_paths = "" -%}
        {%- for _ in index_paths -%}
        {%- assign subpath = _ | split: "/" | first -%}
        {%- if subpath == current_subpath -%}
        {%- assign filtered_paths = filtered_paths | append: _ | append: "," -%}
        {%- endif -%}
        {%- endfor -%}
        {%- assign filtered_paths = filtered_paths | split: "," -%}
        {%- if filtered_paths.size > 1 -%}
        {%- assign header_paths = filtered_paths -%}
        {%- endif -%}
        {%- endif -%}
        {%- endif -%}
        {%- assign header_pages = site.pages
        | where_exp: "_", "header_paths contains _.path and _.title and _.url != '/'"
        | sort: "order" -%}
        <a class="site-title" rel="author" href="{{ '/' | relative_url }}">{{ site.title | escape }}</a>

        {%- if header_pages | size -%}
        <nav class="site-nav">
            <input type="checkbox" id="nav-trigger" class="nav-trigger" aria-label="Navigation" />
            <label for="nav-trigger">
                <span class="menu-icon">
                    <svg viewBox="0 0 18 15" width="18px" height="15px">
                        <path
                            d="M18,1.484c0,0.82-0.665,1.484-1.484,1.484H1.484C0.665,2.969,0,2.304,0,1.484l0,0C0,0.665,0.665,0,1.484,0 h15.032C17.335,0,18,0.665,18,1.484L18,1.484z M18,7.516C18,8.335,17.335,9,16.516,9H1.484C0.665,9,0,8.335,0,7.516l0,0 c0-0.82,0.665-1.484,1.484-1.484h15.032C17.335,6.031,18,6.696,18,7.516L18,7.516z M18,13.516C18,14.335,17.335,15,16.516,15H1.484 C0.665,15,0,14.335,0,13.516l0,0c0-0.82,0.665-1.483,1.484-1.483h15.032C17.335,12.031,18,12.695,18,13.516L18,13.516z" />
                    </svg>
                </span>
            </label>

            <div class="trigger">
                {%- for _ in header_pages -%}
                {%- assign title = _.title -%}
                {%- assign duplicated = header_pages
                | where_exp: "__", "_.title == __.title and _.path != __.path"
                | map: "path" -%}
                {%- if _.path contains "/" and duplicated.size > 0 -%}
                {%- assign title = _.path | split: "/" | first -%}
                {%- for __ in duplicated -%}
                {%- assign subpath = __ | split: "/" | first -%}
                {%- if subpath == title -%}
                {%- assign title = _.path | prepend: " (" | append: ")" | prepend: _.title -%}
                {%- break -%}
                {%- endif -%}
                {%- endfor -%}
                {%- endif -%}
                <a class="page-link" href="{{ _.url | relative_url }}">{{ title | escape | capitalize }}</a>
                {%- endfor -%}
            </div>
        </nav>
        {%- endif -%}
    </div>
</header>