/* ── Header call-to-action button ──
   Renders the "participate" main-menu entry as a highlighted button instead of
   a plain nav tab, while every other tab keeps the theme's normal styling.

   Why a CSS-only approach: Congo's header partial (themes/congo/layouts/
   _partials/header/hybrid.html, 234 lines) has no hook for per-entry styling.
   Copying it into layouts/ just to add one class would mean maintaining a fork
   of it across theme updates. Instead we match the entry by its href, which is
   stable because it follows from the section name `content/participate/`
   (/participate/ in English, /de/participate/ in German).

   The menu entry itself lives in config/_default/menus.{de,en}.toml at
   weight 60, directly after News. Rename the section and this selector must
   change with it.

   Why `li > a` and not just `a`: on /participate/ itself the language switcher
   links to /participate/ and /de/participate/, which match [href$="/participate/"]
   just as well. Those links sit nested inside a <div>, whereas the menu entry
   is a direct child of its <li>. Without the child combinator the language
   options in the dropdown get painted green too.

   Loaded site-wide via layouts/_partials/extend-head.html. */

header nav li > a[href$="/participate/"] {
    display: inline-block;
    padding: 0.45rem 1rem;
    border-radius: 999px;
    background: #0a8f37;
    color: #fff;
    font-weight: 600;
    line-height: 1.2;
    white-space: nowrap;
    text-decoration: none;
    transition: background 0.18s ease, transform 0.18s ease;
}

header nav li > a[href$="/participate/"]:hover {
    background: #05662e;
    color: #fff;
    transform: translateY(-1px);
}

header nav li > a[href$="/participate/"]:focus-visible {
    outline: 2px solid #05662e;
    outline-offset: 2px;
}

/* The theme wraps the label in a <span> carrying group-hover underline
   utilities — undo those inside the button. */
header nav li > a[href$="/participate/"] span {
    text-decoration: none !important;
    color: inherit;
}

/* Dark mode: the green carries enough contrast on its own, only the hover
   state needs to go lighter rather than darker. */
html.dark header nav li > a[href$="/participate/"] {
    background: #0a8f37;
}
html.dark header nav li > a[href$="/participate/"]:hover {
    background: #0fb347;
}
html.dark header nav li > a[href$="/participate/"]:focus-visible {
    outline-color: #4cc47a;
}

/* ── Placement ──
   The entry sits at weight 60, i.e. directly after News and before the search
   and language icons. Only the spacing needs adjusting: the theme's tab gap is
   tuned for plain text links, and the pill needs a little more room from the
   search icon that follows it. */
header nav li:has(> a[href$="/participate/"]) {
    margin-inline-end: 1.75rem;
}

/* In the mobile hamburger panel the list is right-aligned; keep the button
   flush with the other entries and give it room to breathe. */
@media (max-width: 639px) {
    header nav li > a[href$="/participate/"] {
        margin-bottom: 0.5rem;
    }
}