html 由固定 height: 100% 改為 min-height: 100%／100dvh，避免長頁底部露出白邊。

src/app/global.css

@@ -2,6 +2,8 @@
 @tailwind components;
 @tailwind utilities;
 
+/* FP-MTMS Version Checklist | Functions Ref. No. 57 | v1.0.0 | 2026-08-06 */
+
 /* UI standard: light default, primary #3b82f6, accent #10b981 */
 @layer base {
   :root {
@@ -41,11 +43,14 @@ html:has([data-po-workbench-layout]) body {
 
 /* Tablet/mobile: stable layout when virtual keyboard opens */
 html {
-  /* Prefer dynamic viewport height so layout can adapt to keyboard (if browser resizes) */
-  height: 100%;
+  /* min-height (not height) so the document can grow with content;
+     fixed height: 100% locked the box to the viewport and exposed white below long pages. */
+  min-height: 100%;
+  min-height: 100dvh;
   /* Base font size: slightly larger for readability */
   font-size: 16px;
 }
+
 @media (min-width: 640px) {
   html {
     font-size: 17px;