(function () {
  var root = document.querySelector("[data-eighteen]");
  if (!root) return;

  var key = "hg_age_ok";
  var enterBtn = root.querySelector("[data-eighteen-enter]");
  var exitBtn = root.querySelector("[data-eighteen-exit]");

  function alreadyOk() {
    try {
      return window.localStorage.getItem(key) === "1";
    } catch (e) {
      return false;
    }
  }

  function close() {
    var wasOpen = root.classList.contains("is-open");
    root.classList.remove("is-open");
    document.body.classList.remove("eighteen-locked");
    document.documentElement.classList.add("eighteen-ok");
    if (wasOpen) {
      document.dispatchEvent(new CustomEvent("eighteen:closed"));
    }
  }

  function open() {
    root.classList.add("is-open");
    document.body.classList.add("eighteen-locked");
  }

  // 已确认过：不展示
  if (alreadyOk() || document.documentElement.classList.contains("eighteen-ok")) {
    close();
    return;
  }

  // 首次进入：展示
  open();

  if (enterBtn) {
    enterBtn.addEventListener("click", function () {
      try {
        window.localStorage.setItem(key, "1");
      } catch (e) {}
      close();
    });
  }

  if (exitBtn) {
    exitBtn.addEventListener("click", function () {
      window.location.href = "https://www.google.com";
    });
  }
})();