/*! Fiesta 1.1.0 | MPL-2.0 | https://fiesta.rastrillo.org */
(function () {
  "use strict";

  var ROOT = "[rst-shell-sidebar],[rst-shell-console],.rst-shell-sidebar,.rst-shell-console";
  var INDEX = '[rst-shell-sidebar~="index"],[rst-shell-console~="index"],.rst-shell-sidebar--index,.rst-shell-console--index';
  var PAGE = '[rst-shell-sidebar~="page"],[rst-shell-console~="page"],.rst-shell-sidebar--page,.rst-shell-console--page';
  var BACK = "[rst-shell-back] > a[href],.rst-shell__back > a[href]";
  var NAV = "[rst-shell-nav] a[href],.rst-shell__nav a[href]";
  var NARROW = "(max-width: 799.98px)";
  var RETURN = "rst-shell-return", WENT_BACK = "rst-shell-back";

  function store(fn) {
    try { return fn(window.sessionStorage); } catch (e) { return null; }
  }
  function take(key) {
    return store(function (s) { var v = s.getItem(key); s.removeItem(key); return v; });
  }
  function place(href) {
    var u = new URL(href, location.href);
    return u.origin === location.origin ? u.pathname + u.search : null;
  }
  function view(sel) {
    var r = document.querySelector(ROOT);
    return !!r && r.matches(sel);
  }

  function returnFocus() {
    if (document.prerendering || !view(INDEX)) return;
    var rec = take(RETURN), links, hit = null, i, id;
    if (!matchMedia(NARROW).matches) return;
    links = document.querySelectorAll(NAV);
    for (i = 0; rec && !hit && i < links.length; i++) {
      if (place(links[i].href) === rec) hit = links[i];
    }
    if (!hit && location.hash) {
      try { id = decodeURIComponent(location.hash.slice(1)); } catch (e) { id = location.hash.slice(1); }
      hit = document.getElementById(id);
      if (hit && !hit.matches(NAV)) hit = null;
    }
    if (hit) hit.focus();
  }

  function reveal(e) {
    var back = take(WENT_BACK) === location.pathname + location.search, a = window.navigation && navigation.activation;
    if (!back && a && a.navigationType === "traverse" && a.from && a.entry) back = a.entry.index < a.from.index;
    returnFocus();
    if (e.viewTransition && e.viewTransition.types) e.viewTransition.types.add(back ? "back" : "forward");
  }
  if ("onpagereveal" in window) window.addEventListener("pagereveal", reveal);
  else window.addEventListener("pageshow", returnFocus);

  function leave() {
    if (view(PAGE)) store(function (s) { s.setItem(RETURN, location.pathname + location.search); });
  }
  window.addEventListener("onpageswap" in window ? "pageswap" : "pagehide", leave);

  document.addEventListener("click", function (e) {
    var a = e.target.closest && e.target.closest(BACK), nav = window.navigation, cur, prev, want;
    if (!a || e.defaultPrevented || e.button !== 0 || e.ctrlKey || e.metaKey || e.shiftKey || e.altKey) return;
    want = place(a.href);
    if (want !== null) store(function (s) { s.setItem(WENT_BACK, want); });
    cur = nav && nav.currentEntry;
    if (!cur || cur.index < 1) return;
    prev = nav.entries()[cur.index - 1];
    if (want !== null && prev && !prev.sameDocument && prev.url && place(prev.url) === want) {
      e.preventDefault();
      history.back();
    }
  });
})();