// 页面标题切换与闪烁插件（自动运行，无全局变量泄漏）
(function() {
  const originTitle = document.title;
  let blinkTimer, restoreTimer;
  const blinkTitles = ["~你离开了哦~❤️", "~快回来，想你了~💔"];
  let idx = 0;

  document.addEventListener("visibilitychange", () => {
    clearTimeout(restoreTimer);
    restoreTimer = null;
    if (document.hidden) {
      clearInterval(blinkTimer);
      blinkTimer = setInterval(() => {
        document.title = blinkTitles[idx ^= 1];
      }, 500);
    } else {
      clearInterval(blinkTimer);
      blinkTimer = null;
      document.title = "🎉 欢迎回来！";
      restoreTimer = setTimeout(() => {
        document.title = originTitle;
      }, 2000);
    }
  });
})();