diff --git a/assets/js/core/nav.js b/assets/js/core/nav.js
index b773f568..3b9936e3 100644
--- a/assets/js/core/nav.js
+++ b/assets/js/core/nav.js
@@ -18,16 +18,42 @@
   }
 
   function clearFolding() {
-    var more = document.querySelector(".navbar-nav > li.aksrt-nav-more");
-    if (!more) return;
-    var sub = more.querySelector(".sub-menu");
-    var nav = more.parentNode;
-    if (sub && nav) {
-      while (sub.firstChild) {
-        nav.insertBefore(sub.firstChild, more);
+    // Support both zibll-style more and any legacy .aksrt-nav-more nodes.
+    var mores = document.querySelectorAll(".navbar-nav > li.aksrt-nav-more");
+    Array.prototype.forEach.call(mores, function (more) {
+      var nav = more.parentNode;
+      if (!nav) {
+        more.remove();
+        return;
       }
-    }
-    more.remove();
+      // Prefer direct child .sub-menu (zibll contract); fall back to first matching submenu.
+      var sub = null;
+      for (var i = 0; i < more.children.length; i++) {
+        var child = more.children[i];
+        if (
+          child.tagName === "UL" &&
+          (child.classList.contains("sub-menu") ||
+            child.classList.contains("aksrt-nav-more__dropdown"))
+        ) {
+          sub = child;
+          break;
+        }
+      }
+      if (!sub) {
+        sub = more.querySelector(".sub-menu, .aksrt-nav-more__dropdown");
+      }
+      if (sub) {
+        while (sub.firstChild) {
+          // Guard: only insertBefore when more is still a child of nav.
+          if (more.parentNode === nav) {
+            nav.insertBefore(sub.firstChild, more);
+          } else {
+            nav.appendChild(sub.firstChild);
+          }
+        }
+      }
+      more.remove();
+    });
   }
 
   function navFolding() {
@@ -53,6 +79,7 @@
     var navsWidth = 66;
     var foldItems = [];
     Array.prototype.forEach.call(nav.children, function (li) {
+      if (li.classList.contains("aksrt-nav-more")) return;
       navsWidth += li.offsetWidth || 0;
       if (navsWidth > surplus) foldItems.push(li);
     });
@@ -63,7 +90,9 @@
     more.innerHTML =
       '<a href="javascript:void(0);"><i class="fas fa-bars" aria-hidden="true"></i></a><ul class="sub-menu"></ul>';
     var sub = more.querySelector(".sub-menu");
-    foldItems.forEach(function (li) { sub.appendChild(li); });
+    foldItems.forEach(function (li) {
+      if (li && li.parentNode) sub.appendChild(li);
+    });
     nav.appendChild(more);
     appendChevrons(more);
   }
diff --git a/assets/js/enhancements.js b/assets/js/enhancements.js
index 6bf0bbd0..f12d6c17 100644
--- a/assets/js/enhancements.js
+++ b/assets/js/enhancements.js
@@ -521,83 +521,11 @@
   }
 
   /* ============================================================
-   * 4. 导航溢出自动折叠
-   * 菜单项超出容器宽度时折叠进「更多」下拉
+   * 4. 导航溢出折叠
+   * 由 assets/js/core/nav.js（zibll 1:1 navFolding）负责。
+   * 此处不再重复实现，避免两套逻辑争抢 .aksrt-nav-more 节点
+   * 触发 NotFoundError: insertBefore (moreLi 已被对方 remove)。
    * ============================================================ */
-  function initNavOverflow() {
-    var nav = document.querySelector('.navbar-top .nav.navbar-nav');
-    if (!nav) return;
-
-    // 创建「更多」按钮
-    var moreLi = document.createElement('li');
-    moreLi.className = 'nav-item aksrt-nav-more';
-    moreLi.style.display = 'none';
-    moreLi.innerHTML =
-      '<button type="button" class="aksrt-nav-more__btn" aria-haspopup="true" aria-expanded="false">更多 <i class="fas fa-caret-down"></i></button>' +
-      '<ul class="aksrt-nav-more__dropdown"></ul>';
-    nav.appendChild(moreLi);
-
-    var moreBtn = moreLi.querySelector('.aksrt-nav-more__btn');
-    var dropdown = moreLi.querySelector('.aksrt-nav-more__dropdown');
-
-    moreBtn.addEventListener('click', function (e) {
-      e.stopPropagation();
-      var open = dropdown.classList.toggle('is-open');
-      moreBtn.setAttribute('aria-expanded', open ? 'true' : 'false');
-    });
-
-    document.addEventListener('click', function () {
-      dropdown.classList.remove('is-open');
-      moreBtn.setAttribute('aria-expanded', 'false');
-    });
-
-    function checkOverflow() {
-      var items = Array.from(nav.children).filter(function (el) {
-        return !el.classList.contains('aksrt-nav-more');
-      });
-
-      // 重置：把所有项移回原位
-      while (dropdown.firstChild) {
-        var li = dropdown.firstChild;
-        nav.insertBefore(li, moreLi);
-      }
-      moreLi.style.display = 'none';
-
-      var navWidth = nav.clientWidth;
-      var moreWidth = 80; // 预留「更多」按钮宽度
-      var usedWidth = 0;
-      var overflowItems = [];
-
-      items.forEach(function (item) {
-        usedWidth += item.offsetWidth;
-        if (usedWidth + moreWidth > navWidth) {
-          overflowItems.push(item);
-        }
-      });
-
-      if (overflowItems.length > 0) {
-        moreLi.style.display = '';
-        overflowItems.forEach(function (item) {
-          dropdown.appendChild(item);
-        });
-      }
-    }
-
-    // ResizeObserver 监听（避免 resize 抖动）
-    if ('ResizeObserver' in window) {
-      var timer = null;
-      var ro = new ResizeObserver(function () {
-        if (timer) clearTimeout(timer);
-        timer = setTimeout(checkOverflow, 100);
-      });
-      ro.observe(nav);
-    } else {
-      window.addEventListener('resize', checkOverflow, { passive: true });
-    }
-
-    // 初始检测
-    checkOverflow();
-  }
 
   /* ============================================================
    * 初始化入口
@@ -605,7 +533,6 @@
   document.addEventListener('DOMContentLoaded', function () {
     initLightbox();
     initScrollDirection();
-    initNavOverflow();
   });
 
 })();