diff --git a/src/components/BackToTop.tsx b/src/components/BackToTop.tsx
index 26e4475..b8b4656 100644
--- a/src/components/BackToTop.tsx
+++ b/src/components/BackToTop.tsx
@@ -31,7 +31,7 @@ export function BackToTop() {
           exit={{ opacity: 0, scale: 0.8, y: 8 }}
           transition={{ type: "spring", stiffness: 380, damping: 26 }}
           onClick={() => window.scrollTo({ top: 0, behavior: "smooth" })}
-          className="fixed bottom-[94px] right-4 z-30 flex h-11 w-11 items-center justify-center rounded-full bg-ark-gold text-black shadow-lg shadow-black/40 outline-none transition hover:bg-ark-gold2 active:scale-95 focus-visible:ring-2 focus-visible:ring-ark-gold/80 focus-visible:ring-offset-2 focus-visible:ring-offset-ark-bg md:bottom-8 md:right-8"
+          className="fixed bottom-[calc(84px+max(env(safe-area-inset-bottom),0px))] right-4 z-30 flex h-11 w-11 items-center justify-center rounded-full bg-ark-gold text-black shadow-lg shadow-black/40 outline-none transition hover:bg-ark-gold2 active:scale-95 focus-visible:ring-2 focus-visible:ring-ark-gold/80 focus-visible:ring-offset-2 focus-visible:ring-offset-ark-bg md:bottom-8 md:right-8"
           aria-label={t("backToTop")}
           title={t("backToTop")}
         >
diff --git a/src/components/messageStream/hooks/usePostStream.ts b/src/components/messageStream/hooks/usePostStream.ts
index 5a12617..491e963 100644
--- a/src/components/messageStream/hooks/usePostStream.ts
+++ b/src/components/messageStream/hooks/usePostStream.ts
@@ -112,6 +112,17 @@ function streamKey(params: PostStreamParams): string {
   return buildRealUrl(params);
 }
 
+function cacheFirstPage(
+  params: PostStreamParams,
+  page: PostListResponse,
+): void {
+  streamCache.set(streamKey(params), {
+    items: itemsOrEmpty(page.items),
+    cursor: page.nextCursor,
+    hasMore: !!page.nextCursor,
+  });
+}
+
 /**
  * Warm the cache for a stream view before the user navigates to it, so opening
  * the page shows content immediately instead of starting to load on arrival.
@@ -119,20 +130,31 @@ function streamKey(params: PostStreamParams): string {
  */
 export function prefetchPostStream(params: PostStreamParams): void {
   if (USE_MOCK) return;
+  const key = streamKey(params);
+  if (streamCache.has(key)) return;
+
   const url = buildRealUrl(params);
-  if (readJSONCache<PostListResponse>(url)) return;
-  getJSON<PostListResponse>(url).catch(() => {});
+  const cachedPage = readJSONCache<PostListResponse>(url);
+  if (cachedPage) {
+    cacheFirstPage(params, cachedPage);
+    return;
+  }
+
+  getJSON<PostListResponse>(url)
+    .then((page) => cacheFirstPage(params, page))
+    .catch(() => {});
 }
 
 export function usePostStream(params: PostStreamParams): PostStreamResult {
-  const [items, setItems] = useState<Post[]>([]);
-  const [hasMore, setHasMore] = useState(true);
-  const [isLoading, setIsLoading] = useState(false);
+  const initialCached = streamCache.get(streamKey(params));
+  const [items, setItems] = useState<Post[]>(() => initialCached?.items ?? []);
+  const [hasMore, setHasMore] = useState(() => initialCached?.hasMore ?? true);
+  const [isLoading, setIsLoading] = useState(() => !initialCached);
   const [error, setError] = useState<string | null>(null);
 
   const reqIdRef = useRef(0);
-  const cursorRef = useRef<string | undefined>(undefined);
-  const hasMoreRef = useRef(true);
+  const cursorRef = useRef<string | undefined>(initialCached?.cursor);
+  const hasMoreRef = useRef(initialCached?.hasMore ?? true);
   const loadingRef = useRef(false);
 
   const fetchPage = useCallback(
diff --git a/src/layouts/PublicLayout.tsx b/src/layouts/PublicLayout.tsx
index 748fbfd..e3210d2 100644
--- a/src/layouts/PublicLayout.tsx
+++ b/src/layouts/PublicLayout.tsx
@@ -411,7 +411,7 @@ export function PublicLayout() {
   }, [mobileSearchOpen]);
 
   return (
-    <div className="min-h-full flex flex-col">
+    <div className="flex min-h-[100dvh] flex-col bg-ark-bg">
       <DocumentMeta />
       <header className="sticky top-0 z-40 select-none bg-[#08070c] backdrop-blur-md md:border-b md:border-ark-line md:bg-ark-nav/98">
         <div className="flex h-[64px] items-center justify-between bg-[#08070c] px-4 py-3 md:hidden">
@@ -694,7 +694,7 @@ export function PublicLayout() {
       ) : null}
 
       <main
-        className={`mx-auto w-full max-w-[1280px] ${
+        className={`mx-auto w-full max-w-[1280px] max-md:pb-[calc(68px+max(env(safe-area-inset-bottom),0px)+1rem)] ${
           isHome
             ? "flex-1 px-0 pb-6 pt-0 md:px-9 md:pb-10 md:pt-10 xl:px-0"
             : footerInContentFlow
@@ -715,8 +715,8 @@ export function PublicLayout() {
         </AnimatePresence>
       </main>
 
-      <nav className="sticky inset-x-0 bottom-0 z-40 select-none bg-[#0C0D0F]/90 backdrop-blur md:hidden">
-        <div className="grid h-[78px] grid-cols-4 gap-3 px-5 py-4 text-center text-[11px] leading-[17.6px]">
+      <nav className="fixed inset-x-0 bottom-0 z-40 select-none bg-[#0C0D0F]/95 pb-[max(env(safe-area-inset-bottom),0px)] backdrop-blur md:hidden">
+        <div className="grid h-[68px] grid-cols-4 gap-3 px-5 py-[10px] text-center text-[11px] leading-[17.6px]">
           <BottomNavIcon
             to="/"
             label={t("home")}
@@ -764,9 +764,8 @@ function BottomNavIcon({
   icon: "home" | "document" | "bookmark" | "update";
   active: boolean;
 }) {
-  const src = active
-    ? `${NAVBAR_ICON_BASE}/${icon}-active.svg`
-    : `${NAVBAR_ICON_BASE}/${icon}-inactive.svg`;
+  const activeSrc = `${NAVBAR_ICON_BASE}/${icon}-active.svg`;
+  const inactiveSrc = `${NAVBAR_ICON_BASE}/${icon}-inactive.svg`;
   return (
     <Link
       to={to}
@@ -775,15 +774,30 @@ function BottomNavIcon({
         active ? "text-ark-gold" : "text-[#908F92]",
       ].join(" ")}
     >
-      <img
-        src={src}
-        alt=""
-        className="mx-auto h-6 w-6 object-contain"
-        width={24}
-        height={24}
-        loading="lazy"
-        decoding="async"
-      />
+      <span className="relative h-6 w-6" aria-hidden>
+        <img
+          src={inactiveSrc}
+          alt=""
+          className={`absolute inset-0 h-6 w-6 object-contain ${
+            active ? "opacity-0" : "opacity-100"
+          }`}
+          width={24}
+          height={24}
+          loading="eager"
+          decoding="sync"
+        />
+        <img
+          src={activeSrc}
+          alt=""
+          className={`absolute inset-0 h-6 w-6 object-contain ${
+            active ? "opacity-100" : "opacity-0"
+          }`}
+          width={24}
+          height={24}
+          loading="eager"
+          decoding="sync"
+        />
+      </span>
       <span className="leading-tight">{label}</span>
     </Link>
   );