(function() {
  'use strict';

  var transitionMs = 120;

  function prefersReducedMotion() {
    return window.matchMedia && window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  }

  function isInternalNavigation(link) {
    if (!link || !link.href || link.target || link.hasAttribute('download')) return false;

    var targetUrl;
    try {
      targetUrl = new URL(link.href, window.location.href);
    } catch (_error) {
      return false;
    }

    if (targetUrl.origin !== window.location.origin) return false;
    if (targetUrl.pathname === window.location.pathname && targetUrl.search === window.location.search) {
      return targetUrl.hash && targetUrl.hash !== window.location.hash;
    }
    return true;
  }

  function initPageTransitions() {
    if (prefersReducedMotion()) return;

    document.addEventListener('click', function(event) {
      if (event.defaultPrevented || event.button !== 0 || event.metaKey || event.ctrlKey || event.shiftKey || event.altKey) {
        return;
      }

      var link = event.target.closest ? event.target.closest('a[href]') : null;
      if (!isInternalNavigation(link)) return;

      var targetUrl = new URL(link.href, window.location.href);
      if (targetUrl.pathname === window.location.pathname && targetUrl.search === window.location.search) return;

      event.preventDefault();
      document.body.classList.add('page-leaving');
      window.setTimeout(function() {
        window.location.href = targetUrl.href;
      }, transitionMs);
    });
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', initPageTransitions, { once: true });
  } else {
    initPageTransitions();
  }
})();