(function() {
  'use strict';

  function initHeader() {
    var header = document.querySelector('.gongxue-header');
    if (!header) return;
    var update = function() { header.classList.toggle('scrolled', window.scrollY > 20); };
    window.addEventListener('scroll', update, { passive: true });
    update();
  }

  function initHeaderFocusGuard() {
    var header = document.querySelector('.gongxue-header');
    if (!header) return;

    var clearFocus = function(target) {
      if (target && typeof target.blur === 'function') {
        requestAnimationFrame(function() { target.blur(); });
      }
    };

    header.addEventListener('pointerdown', function(e) {
      clearFocus(e.target.closest('a,button'));
    });
    header.addEventListener('click', function(e) {
      clearFocus(e.target.closest('a,button'));
    });
    window.addEventListener('pageshow', function() {
      if (header.contains(document.activeElement)) {
        clearFocus(document.activeElement);
      }
    });
  }

  function initMobileMenu() {
    var toggle = document.querySelector('.mobile-menu-toggle');
    var menu = document.querySelector('.mobile-menu');
    if (!toggle || !menu) return;
    toggle.addEventListener('click', function() {
      var open = menu.classList.contains('active');
      menu.classList.toggle('active');
      menu.classList.toggle('hidden');
      document.body.style.overflow = open ? '' : 'hidden';
    });
    menu.querySelectorAll('a').forEach(function(link) {
      link.addEventListener('click', function() {
        menu.classList.remove('active');
        menu.classList.add('hidden');
        document.body.style.overflow = '';
      });
    });
  }

  function initHeroVideo() {
    document.querySelectorAll('[data-gx-video]').forEach(function(box) {
      var video = box.querySelector('video');
      var play = box.querySelector('[data-gx-play]');
      var cover = box.querySelector('[data-gx-cover]');
      if (!video || !play) return;
      play.addEventListener('click', function() {
        if (!video.src && video.dataset.src) video.src = video.dataset.src;
        video.controls = true;
        video.play();
        video.classList.remove('opacity-0');
        video.classList.add('opacity-100');
        if (cover) cover.classList.add('hidden');
        play.classList.add('hidden');
      });
    });
  }

  function initModals() {
    document.querySelectorAll('[data-gx-modal-open]').forEach(function(button) {
      button.addEventListener('click', function() {
        var modal = document.querySelector(button.dataset.gxModalOpen);
        if (modal) modal.classList.add('active');
      });
    });
    document.querySelectorAll('[data-gx-modal-close], .gx-modal-backdrop').forEach(function(button) {
      button.addEventListener('click', function() {
        var modal = button.closest('.gx-modal');
        if (modal) modal.classList.remove('active');
      });
    });
  }

  function initFloatingService() {
    var toggle = document.querySelector('.service-toggle');
    var menu = document.querySelector('.service-menu');
    if (!toggle || !menu) return;
    toggle.addEventListener('click', function() {
      menu.classList.toggle('closed');
      toggle.classList.toggle('rotate-90');
    });
    document.addEventListener('click', function(e) {
      var service = document.querySelector('.floating-service');
      if (service && !service.contains(e.target)) {
        menu.classList.add('closed');
        toggle.classList.remove('rotate-90');
      }
    });
  }

  function initShare() {
    document.querySelectorAll('.gx-share').forEach(function(button) {
      button.addEventListener('click', function() {
        var url = button.dataset.url || location.href;
        var title = button.dataset.title || document.title;
        if (navigator.share) {
          navigator.share({ title: title, url: url }).catch(function() {});
        } else if (navigator.clipboard) {
          navigator.clipboard.writeText(url);
          button.textContent = '链接已复制';
          setTimeout(function() { button.textContent = '分享文章'; }, 1400);
        }
      });
    });
  }

  function initCounters() {
    var nodes = document.querySelectorAll('[data-count-end]');
    if (!nodes.length || !('IntersectionObserver' in window)) return;
    var observer = new IntersectionObserver(function(entries) {
      entries.forEach(function(entry) {
        if (!entry.isIntersecting || entry.target.dataset.done) return;
        entry.target.dataset.done = '1';
        var el = entry.target;
        var end = parseFloat(el.dataset.countEnd) || 0;
        var suffix = el.dataset.countSuffix || '';
        var start = performance.now();
        function frame(now) {
          var t = Math.min((now - start) / 1800, 1);
          var value = end * (1 - Math.pow(1 - t, 4));
          el.textContent = Math.round(value) + suffix;
          if (t < 1) requestAnimationFrame(frame);
        }
        requestAnimationFrame(frame);
      });
    }, { threshold: 0.4 });
    nodes.forEach(function(node) { observer.observe(node); });
  }

  document.addEventListener('DOMContentLoaded', function() {
    initHeader();
    initHeaderFocusGuard();
    initMobileMenu();
    initHeroVideo();
    initModals();
    initFloatingService();
    initShare();
    initCounters();
  });
})();