() => {
  /**
   * Dual-skin boot: pick desktop vs phone layout, keep a single set of IDs in the DOM.
   *
   * Rules (first match wins for force flags):
   *   ?ui=phone | ?ui=mobile  → phone
   *   ?ui=desktop | ?ui=pc    → desktop
   *   Mobile / phone UA       → phone  (HF embeds often report a WIDE iframe width)
   *   max-width ≤ 768px       → phone
   *   else                    → desktop
   *
   * Unused skin is removed so getElementById stays unambiguous for gallery.js.
   */
  function wantPhoneUI() {
    try {
      var q = new URLSearchParams(window.location.search || "");
      var force = (q.get("ui") || "").toLowerCase();
      if (force === "phone" || force === "mobile") return true;
      if (force === "desktop" || force === "pc") return false;
    } catch (e) {}

    // Real phones/tablets in portrait-ish embeds: don't trust iframe CSS width alone
    try {
      var ua = navigator.userAgent || "";
      if (/Android.+Mobile|iPhone|iPod|webOS|BlackBerry|IEMobile|Opera Mini/i.test(ua)) {
        return true;
      }
      // iPad / Android tablet — treat as phone layout (single column)
      if (/iPad|Android(?!.*Mobile)|Tablet/i.test(ua)) {
        return true;
      }
      if (navigator.platform === "MacIntel" && navigator.maxTouchPoints > 1) {
        return true; // iPadOS desktop UA
      }
    } catch (e2) {}

    try {
      if (window.matchMedia("(max-width: 768px)").matches) return true;
      // Very short + narrow-ish viewport (mobile browser chrome)
      if (window.matchMedia("(max-width: 900px) and (max-height: 900px) and (pointer: coarse)").matches) {
        return true;
      }
    } catch (e3) {
      if ((window.innerWidth || 1024) <= 768) return true;
    }
    return false;
  }

  /**
   * Gradio / Spaces often inject maximum-scale=1 or user-scalable=no, which kills
   * pinch-zoom. Restore a viewport that allows zoom (a11y + your request).
   */
  function ensureZoomableViewport() {
    try {
      var allow =
        "width=device-width, initial-scale=1, viewport-fit=cover, " +
        "minimum-scale=0.5, maximum-scale=5, user-scalable=yes";
      var metas = document.querySelectorAll('meta[name="viewport"]');
      if (!metas || !metas.length) {
        var m = document.createElement("meta");
        m.setAttribute("name", "viewport");
        m.setAttribute("content", allow);
        (document.head || document.documentElement).appendChild(m);
        return;
      }
      for (var i = 0; i < metas.length; i++) {
        metas[i].setAttribute("content", allow);
      }
    } catch (e) {}
  }

  /**
   * HF / Gradio wrap the app in transformed/overflow ancestors, so position:fixed
   * on .phone-run is relative to that box (often off-screen). Moving the bar to
   * document.body makes fixed = real viewport. Embeds often don't have those
   * ancestors — which is why floating Edit already worked there.
   */
  function pinPhoneRunBar() {
    try {
      if (window.__qwenUiSkin !== "phone") return;
      var bar = document.querySelector(".phone-run");
      if (!bar || !document.body) return;
      if (bar.parentNode === document.body) {
        bar.classList.add("phone-run--ported");
        return;
      }
      // Marker so we can leave a spacer if needed (stack already has padding-bottom)
      bar.setAttribute("data-ported", "1");
      bar.classList.add("phone-run--ported");
      document.body.appendChild(bar);
    } catch (e) {}
  }

  function activate() {
    var phone = wantPhoneUI();
    var desktop = document.getElementById("skin-desktop");
    var phoneEl = document.getElementById("skin-phone");

    // Skins not in DOM yet
    if (!desktop && !phoneEl) return false;

    // Always allow pinch/zoom — do not lock scale on phone or desktop
    ensureZoomableViewport();

    if (phone) {
      if (desktop && desktop.parentNode) desktop.parentNode.removeChild(desktop);
      if (phoneEl) {
        phoneEl.hidden = false;
        phoneEl.removeAttribute("hidden");
        phoneEl.style.display = "";
      }
      document.documentElement.setAttribute("data-ui-skin", "phone");
      try { document.body && document.body.setAttribute("data-ui-skin", "phone"); } catch (e4) {}
      window.__qwenUiSkin = "phone";
      pinPhoneRunBar();
      // DOM may still be settling on HF
      setTimeout(pinPhoneRunBar, 100);
      setTimeout(pinPhoneRunBar, 500);
      setTimeout(pinPhoneRunBar, 1500);
    } else {
      // If we previously ported the bar, remove orphan
      try {
        var orphan = document.querySelector("body > .phone-run");
        if (orphan) orphan.parentNode.removeChild(orphan);
      } catch (e6) {}
      if (phoneEl && phoneEl.parentNode) phoneEl.parentNode.removeChild(phoneEl);
      if (desktop) {
        desktop.hidden = false;
        desktop.removeAttribute("hidden");
        desktop.style.display = "";
      }
      document.documentElement.setAttribute("data-ui-skin", "desktop");
      try { document.body && document.body.setAttribute("data-ui-skin", "desktop"); } catch (e5) {}
      window.__qwenUiSkin = "desktop";
    }
    return true;
  }

  // Expose for gallery.js / lora_demo.js if boot load order is flaky
  window.__qwenActivateUiSkin = activate;
  window.__qwenWantPhoneUI = wantPhoneUI;
  window.__qwenEnsureZoomableViewport = ensureZoomableViewport;
  window.__qwenPinPhoneRunBar = pinPhoneRunBar;

  function tryActivate(n) {
    // Fix zoom even before skins appear (Gradio may set a locked viewport early)
    ensureZoomableViewport();
    if (activate()) {
      // Gradio sometimes rewrites viewport after load — re-assert zoom a few times
      setTimeout(ensureZoomableViewport, 200);
      setTimeout(ensureZoomableViewport, 1000);
      setTimeout(ensureZoomableViewport, 3000);
      return;
    }
    if (n < 60) setTimeout(function () { tryActivate(n + 1); }, 50);
  }
  tryActivate(0);
}