diff --git a/public/themes/dist_static/static/css/common.css b/public/themes/dist_static/static/css/common.css
index e2aec54..f45150e 100644
--- a/public/themes/dist_static/static/css/common.css
+++ b/public/themes/dist_static/static/css/common.css
@@ -309,7 +309,17 @@ body {
 }html {
   font-size: 16Px;
   scrollbar-gutter: stable;
-}body {
+}
+/* 覆盖 Lenis 默认 overflow:clip，尽量保住滚动条 */
+html.lenis.lenis-stopped {
+  overflow: auto !important;
+}
+/* 若滚动条仍消失：只收窄 fixed 头部，不改内容区宽度 */
+html.is-scroll-locked .site-header {
+  width: auto;
+  right: var(--scroll-lock-compensation, 0px);
+}
+body {
   overflow-x: hidden;
   font-family: "MiSans VF", "PingFang SC", sans-serif;
   color: var(--color-text);
diff --git a/public/themes/dist_static/static/js/common.js b/public/themes/dist_static/static/js/common.js
index 46a695a..e99cb9f 100644
--- a/public/themes/dist_static/static/js/common.js
+++ b/public/themes/dist_static/static/js/common.js
@@ -147,16 +147,41 @@ $(function() {
 		$(this).attr("aria-expanded", !isExpanded);
 	});
 
-	// Lenis.stop() 会 preventDefault 所有滚轮；面板需 data-lenis-prevent 才能内部滚动
+	// Lenis.stop() 会加 .lenis-stopped { overflow: clip }，经典滚动条（如360）消失后
+	// fixed 头部会变宽；内容区通常不变。只补偿头部，不给 html/body 加 padding。
+	function getScrollbarWidth() {
+		return Math.max(0, window.innerWidth - document.documentElement.clientWidth);
+	}
+	function lockPageScroll() {
+		const root = document.documentElement;
+		if (root.classList.contains("is-scroll-locked")) return;
+		const sbw = getScrollbarWidth();
+		root.style.setProperty("--scroll-lock-compensation", `${sbw}px`);
+		root.classList.add("is-scroll-locked");
+		lenis.stop();
+		// 若 CSS 已保住滚动条，则清零补偿，避免头部被多余收窄
+		requestAnimationFrame(() => {
+			if (getScrollbarWidth() > 0) {
+				root.style.setProperty("--scroll-lock-compensation", "0px");
+			}
+		});
+	}
+	function unlockPageScroll() {
+		const root = document.documentElement;
+		if (!root.classList.contains("is-scroll-locked")) return;
+		root.classList.remove("is-scroll-locked");
+		root.style.removeProperty("--scroll-lock-compensation");
+		lenis.start();
+	}
+
 	$(".nav-mega").attr("data-lenis-prevent", "");
 
-	// hover 展开 mega 面板时禁止/恢复页面滚动
 	$(".site-header__nav-item--mega").on("mouseenter", function() {
 		if ($("body").hasClass("is-mask-open")) return;
-		lenis.stop();
+		lockPageScroll();
 	}).on("mouseleave", function() {
 		if ($("body").hasClass("is-mask-open")) return;
-		lenis.start();
+		unlockPageScroll();
 	});
 });
 //#endregion
diff --git a/public/themes/static_new/styles/base.css b/public/themes/static_new/styles/base.css
index e7c10ae..b8a71b4 100644
--- a/public/themes/static_new/styles/base.css
+++ b/public/themes/static_new/styles/base.css
@@ -6,6 +6,13 @@ html {
   font-size: 16px;
   scrollbar-gutter: stable;
 }
+html.lenis.lenis-stopped {
+  overflow: auto !important;
+}
+html.is-scroll-locked .site-header {
+  width: auto;
+  right: var(--scroll-lock-compensation, 0px);
+}
 html,body{
   width: 100%;
   height: 100%;