diff --git a/web/navi.css b/web/navi.css
index bc2dbdb..ca98c84 100644
--- a/web/navi.css
+++ b/web/navi.css
@@ -1782,3 +1782,29 @@ html.navi-dark body .navi-ws-modal-title,
 html.navi-dark body .navi-ws-notice-title {
   color: #e8eefc !important;
 }
+
+/* ── 矮视口下备案号不再撑高页面 ──
+   实测复现：900x520 时 .navi-footer-host 从 39px 换行涨到 69px，
+   而它在文档流里（margin-top:auto），于是页面被顶高 47px → 出现纵向滚动。
+   只对"矮窗口"收紧：缩小内边距/字号并禁止换行（矮窗口通常较宽，不会横向溢出）。
+   高窗口与移动端不受影响。 */
+@media (max-height: 560px) {
+  html[data-theme] .navi-footer-host {
+    padding: 2px !important;
+  }
+  html[data-theme] .navi-footer {
+    margin: 4px auto 0 !important;
+    padding: 5px 12px !important;
+    font-size: 11.5px !important;
+    flex-wrap: nowrap !important;
+    white-space: nowrap !important;
+    max-width: calc(100% - 12px) !important;
+    overflow: hidden !important;
+  }
+  html[data-theme] .navi-search-bar {
+    bottom: calc(60px + env(safe-area-inset-bottom, 0px)) !important;
+  }
+  html[data-theme] .navi-dock {
+    bottom: calc(60px + env(safe-area-inset-bottom, 0px)) !important;
+  }
+}