feat: scroll to post bubble from recommended card + back-to-top button

Recommended cards already routed to /browse#post-<id>, but the stream had
no logic to scroll to the target bubble — and the post might not be paged
in yet. MessageStream now resolves the #post-<id> hash, auto-loads more
pages until the bubble renders, scrolls to it, and gives it a brief gold
highlight. Bubbles get scroll-mt so they clear the sticky header.

Also adds a global floating back-to-top button (BackToTop) mounted in
PublicLayout, shown after scrolling past 400px.

Bundles related staging UI work already present in the working tree.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

package-lock.json

@@ -8,7 +8,7 @@
       "name": "ark-database-web",
       "version": "1.0.0",
       "dependencies": {
-        "animate.css": "^4.1.1",
+        "framer-motion": "^11.18.2",
         "lucide-react": "^0.460.0",
         "react": "^18.3.1",
         "react-dom": "^18.3.1",
@@ -1722,12 +1722,6 @@
         "url": "https://opencollective.com/vitest"
       }
     },
-    "node_modules/animate.css": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/animate.css/-/animate.css-4.1.1.tgz",
-      "integrity": "sha512-+mRmCTv6SbCmtYJCN4faJMNFVNN5EuCTTprDTAo7YzIGji2KADmakjVA3+8mVDkZ2Bf09vayB35lSQIex2+QaQ==",
-      "license": "MIT"
-    },
     "node_modules/ansi-regex": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
@@ -2360,6 +2354,33 @@
         "url": "https://github.com/sponsors/rawify"
       }
     },
+    "node_modules/framer-motion": {
+      "version": "11.18.2",
+      "resolved": "https://registry.npmjs.org/framer-motion/-/framer-motion-11.18.2.tgz",
+      "integrity": "sha512-5F5Och7wrvtLVElIpclDT0CBzMVg3dL22B64aZwHtsIY8RB4mXICLrkajK4G9R+ieSAGcgrLeae2SeUTg2pr6w==",
+      "license": "MIT",
+      "dependencies": {
+        "motion-dom": "^11.18.1",
+        "motion-utils": "^11.18.1",
+        "tslib": "^2.4.0"
+      },
+      "peerDependencies": {
+        "@emotion/is-prop-valid": "*",
+        "react": "^18.0.0 || ^19.0.0",
+        "react-dom": "^18.0.0 || ^19.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@emotion/is-prop-valid": {
+          "optional": true
+        },
+        "react": {
+          "optional": true
+        },
+        "react-dom": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/fsevents": {
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
@@ -2774,6 +2795,21 @@
         "node": ">=4"
       }
     },
+    "node_modules/motion-dom": {
+      "version": "11.18.1",
+      "resolved": "https://registry.npmjs.org/motion-dom/-/motion-dom-11.18.1.tgz",
+      "integrity": "sha512-g76KvA001z+atjfxczdRtw/RXOM3OMSdd1f4DL77qCTF/+avrRJiawSG4yDibEQ215sr9kpinSlX2pCTJ9zbhw==",
+      "license": "MIT",
+      "dependencies": {
+        "motion-utils": "^11.18.1"
+      }
+    },
+    "node_modules/motion-utils": {
+      "version": "11.18.1",
+      "resolved": "https://registry.npmjs.org/motion-utils/-/motion-utils-11.18.1.tgz",
+      "integrity": "sha512-49Kt+HKjtbJKLtgO/LKj9Ld+6vw9BjH5d9sc40R/kVyH8GLAXgT42M2NnuPcJNuA3s9ZfZBUcwIgpmZWGEE+hA==",
+      "license": "MIT"
+    },
     "node_modules/ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
@@ -3728,6 +3764,12 @@
       "dev": true,
       "license": "Apache-2.0"
     },
+    "node_modules/tslib": {
+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
+      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
+      "license": "0BSD"
+    },
     "node_modules/typescript": {
       "version": "5.9.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",

package.json

@@ -13,7 +13,7 @@
     "test:watch": "vitest"
   },
   "dependencies": {
-    "animate.css": "^4.1.1",
+    "framer-motion": "^11.18.2",
     "lucide-react": "^0.460.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",

src/App.tsx

@@ -1,5 +1,7 @@
 import { BrowserRouter, Navigate, Route, Routes } from "react-router-dom";
 import { I18nProvider } from "./i18n";
+import { MotionProvider } from "./motion";
+import { ToastProvider } from "./components/Toast";
 import { PublicLayout } from "./layouts/PublicLayout";
 import { Home } from "./pages/Home";
 import { Browse } from "./pages/Browse";
@@ -21,6 +23,8 @@ const adminEnabled = import.meta.env.VITE_DISABLE_ADMIN !== "true";
 export default function App() {
   return (
     <I18nProvider>
+      <MotionProvider>
+        <ToastProvider>
         <AdminRouterModeProvider value="absolute">
         <ImageLightboxProvider>
           <VideoPlayerProvider>
@@ -56,6 +60,8 @@ export default function App() {
           </VideoPlayerProvider>
         </ImageLightboxProvider>
         </AdminRouterModeProvider>
+        </ToastProvider>
+      </MotionProvider>
     </I18nProvider>
   );
 }

src/components/BackToTop.tsx

@@ -0,0 +1,45 @@
+import { ArrowUp } from "lucide-react";
+import { AnimatePresence, m } from "framer-motion";
+import { useEffect, useState } from "react";
+import { useI18n } from "../i18n";
+
+const SHOW_AFTER = 400;
+
+/**
+ * Floating "back to top" button. Appears once the page is scrolled past
+ * SHOW_AFTER px and smoothly returns the window to the top on click. Sits
+ * above the mobile bottom nav and clears it on larger screens.
+ */
+export function BackToTop() {
+  const { t } = useI18n();
+  const [visible, setVisible] = useState(false);
+
+  useEffect(() => {
+    const update = () => setVisible(window.scrollY > SHOW_AFTER);
+    update();
+    window.addEventListener("scroll", update, { passive: true });
+    return () => window.removeEventListener("scroll", update);
+  }, []);
+
+  return (
+    <AnimatePresence>
+      {visible ? (
+        <m.button
+          type="button"
+          initial={{ opacity: 0, scale: 0.8, y: 8 }}
+          animate={{ opacity: 1, scale: 1, y: 0 }}
+          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"
+          aria-label={t("backToTop")}
+          title={t("backToTop")}
+        >
+          <ArrowUp className="h-5 w-5" strokeWidth={2.4} />
+        </m.button>
+      ) : null}
+    </AnimatePresence>
+  );
+}

src/components/RecommendedCard.tsx

@@ -1,4 +1,5 @@
 import { Download, LoaderCircle } from "lucide-react";
+import { m } from "framer-motion";
 import { Link } from "react-router-dom";
 import type { Resource } from "../api";
 import { assetUrl } from "../api";
@@ -11,13 +12,20 @@ import {
   downloadAttachment,
   downloadFile,
 } from "./messageStream/utils/downloadFile";
+import { useToast } from "./Toast";
 
 function isPlaceholderAsset(path: string | undefined | null) {
   return !path || path.includes("placeholder-cover");
 }
 
 const CARD_BASE_CLASS =
-  "group flex shrink-0 flex-col overflow-hidden rounded-xl border bg-[#1D1E23] transition hover:border-ark-gold/55";
+  "group flex shrink-0 flex-col overflow-hidden rounded-xl border bg-[#1D1E23] transition hover:border-ark-gold/55 hover:shadow-lg hover:shadow-black/30";
+
+const CARD_HOVER_SPRING = {
+  type: "spring",
+  stiffness: 380,
+  damping: 26,
+} as const;
 
 const CARD_CAROUSEL_SIZE_CLASS =
   "w-[208px] md:w-[240px] lg:w-[246.4px] min-[1100px]:max-xl:w-[273px] xl:w-[246.4px]";
@@ -41,6 +49,7 @@ export function RecommendedCard({
   layout?: "carousel" | "grid";
 }) {
   const { t } = useI18n();
+  const { showToast } = useToast();
   const [isDownloading, setIsDownloading] = useState(false);
   const figmaCover =
     officialRecommendationCoverFallbacks[
@@ -73,18 +82,21 @@ export function RecommendedCard({
           r.downloadAttachmentId,
           displayTitle,
         );
-        return;
+      } else {
-      }
         await downloadFile(dl, displayTitle);
+      }
+      showToast(t("downloadOk"));
     } catch {
-      /* ignore */
+      showToast(t("downloadFail"), "error");
     } finally {
       setIsDownloading(false);
     }
   };
 
   return (
-    <article
+    <m.article
+      whileHover={{ y: -4 }}
+      transition={CARD_HOVER_SPRING}
       className={`${CARD_BASE_CLASS} ${
         layout === "grid" ? CARD_GRID_SIZE_CLASS : CARD_CAROUSEL_SIZE_CLASS
       } ${
@@ -101,12 +113,9 @@ export function RecommendedCard({
           <img
             src={cover}
             alt=""
-            className={`h-full w-full object-cover transition duration-300 ${
+            className="ark-img-fade h-full w-full object-cover transition duration-300 group-hover:scale-[1.02]"
-              useFigmaDesign
-                ? "group-hover:scale-[1.02]"
-                : "group-hover:scale-[1.02]"
-            }`}
             loading="lazy"
+            onLoad={(e) => e.currentTarget.classList.add("is-loaded")}
           />
         ) : (
           <div className="h-full w-full bg-gradient-to-br from-neutral-900 to-neutral-950" />
@@ -164,8 +173,8 @@ export function RecommendedCard({
               type="button"
               className={
                 useFigmaDesign
-                  ? "flex h-10 w-10 shrink-0 items-center justify-center rounded-full bg-[#191921] text-ark-gold outline-none transition hover:bg-[#22232D] focus-visible:ring-2 focus-visible:ring-ark-gold/80 disabled:cursor-wait"
+                  ? "flex h-10 w-10 shrink-0 items-center justify-center rounded-full bg-[#191921] text-ark-gold outline-none transition hover:bg-[#22232D] active:scale-95 focus-visible:ring-2 focus-visible:ring-ark-gold/80 disabled:cursor-wait"
-                  : "shrink-0 rounded-lg p-1 text-ark-gold outline-none hover:bg-ark-gold/10 focus-visible:ring-2 focus-visible:ring-ark-gold/80 disabled:cursor-wait"
+                  : "shrink-0 rounded-lg p-1 text-ark-gold outline-none transition hover:bg-ark-gold/10 active:scale-95 focus-visible:ring-2 focus-visible:ring-ark-gold/80 disabled:cursor-wait"
               }
               title={isDownloading ? t("downloading") : t("download")}
               aria-label={isDownloading ? t("downloading") : t("download")}
@@ -179,11 +188,7 @@ export function RecommendedCard({
             >
               {isDownloading ? (
                 <LoaderCircle
-                  className={
+                  className="h-5 w-5 animate-spin"
-                    useFigmaDesign
-                      ? "h-5 w-5 animate-spin"
-                      : "h-5 w-5 animate-spin"
-                  }
                   strokeWidth={2.2}
                 />
               ) : useFigmaDesign ? (
@@ -195,7 +200,7 @@ export function RecommendedCard({
           ) : null}
         </div>
       </div>
-    </article>
+    </m.article>
   );
 }
 

src/components/Skeleton.tsx

@@ -0,0 +1,24 @@
+import type { CSSProperties } from "react";
+
+type SkeletonProps = {
+  /** Sizing / rounding utilities, e.g. "h-[88px] w-full rounded-xl". */
+  className?: string;
+  style?: CSSProperties;
+};
+
+/**
+ * Reusable shimmer placeholder. Renders the reduced-motion-guarded
+ * `.ark-skeleton` utility (defined in index.css), so the shimmer animation
+ * automatically stops when the user prefers reduced motion. Pass the same
+ * sizing/rounding classes as the real content it stands in for to avoid any
+ * layout shift when the data loads.
+ */
+export function Skeleton({ className = "", style }: SkeletonProps) {
+  return (
+    <div
+      className={`ark-skeleton ${className}`.trim()}
+      style={style}
+      aria-hidden="true"
+    />
+  );
+}

src/components/Toast.tsx

@@ -0,0 +1,98 @@
+import { AnimatePresence, m } from "framer-motion";
+import {
+  createContext,
+  useCallback,
+  useContext,
+  useMemo,
+  useRef,
+  useState,
+  type ReactNode,
+} from "react";
+
+type ToastVariant = "success" | "error";
+
+type ToastItem = {
+  id: number;
+  message: string;
+  variant: ToastVariant;
+};
+
+type ToastContextValue = {
+  showToast: (message: string, variant?: ToastVariant) => void;
+};
+
+const ToastContext = createContext<ToastContextValue | null>(null);
+
+export function useToast(): ToastContextValue {
+  const ctx = useContext(ToastContext);
+  if (!ctx) {
+    throw new Error("useToast must be used within a ToastProvider");
+  }
+  return ctx;
+}
+
+const AUTO_DISMISS_MS = 3000;
+
+/**
+ * App-level toast host. Renders an aria-live region so screen readers announce
+ * messages. Enter/exit animations go through framer's `m` (under MotionProvider),
+ * so they automatically respect the user's reduced-motion preference.
+ */
+export function ToastProvider({ children }: { children: ReactNode }) {
+  const [toasts, setToasts] = useState<ToastItem[]>([]);
+  const idRef = useRef(0);
+
+  const dismiss = useCallback((id: number) => {
+    setToasts((prev) => prev.filter((toast) => toast.id !== id));
+  }, []);
+
+  const showToast = useCallback(
+    (message: string, variant: ToastVariant = "success") => {
+      const id = (idRef.current += 1);
+      setToasts((prev) => [...prev, { id, message, variant }]);
+      window.setTimeout(() => dismiss(id), AUTO_DISMISS_MS);
+    },
+    [dismiss],
+  );
+
+  const value = useMemo(() => ({ showToast }), [showToast]);
+
+  return (
+    <ToastContext.Provider value={value}>
+      {children}
+      <div
+        className="pointer-events-none fixed inset-x-0 bottom-[92px] z-[100] flex flex-col items-center gap-2 px-4 md:bottom-6"
+        aria-live="polite"
+        aria-atomic="true"
+      >
+        <AnimatePresence initial={false}>
+          {toasts.map((toast) => (
+            <m.div
+              key={toast.id}
+              initial={{ opacity: 0, y: 12, scale: 0.96 }}
+              animate={{ opacity: 1, y: 0, scale: 1 }}
+              exit={{ opacity: 0, y: 8, scale: 0.96 }}
+              transition={{ duration: 0.22, ease: [0.22, 1, 0.36, 1] }}
+              role="status"
+              className={[
+                "pointer-events-auto flex max-w-[90vw] items-center gap-2 rounded-full border px-4 py-2.5 text-sm font-medium shadow-2xl shadow-black/50 backdrop-blur-md",
+                toast.variant === "success"
+                  ? "border-ark-gold/40 bg-[#1c1c21]/95 text-ark-gold2"
+                  : "border-red-500/40 bg-[#1c1c21]/95 text-red-300",
+              ].join(" ")}
+            >
+              <span
+                className={[
+                  "h-2 w-2 shrink-0 rounded-full",
+                  toast.variant === "success" ? "bg-ark-gold" : "bg-red-400",
+                ].join(" ")}
+                aria-hidden
+              />
+              {toast.message}
+            </m.div>
+          ))}
+        </AnimatePresence>
+      </div>
+    </ToastContext.Provider>
+  );
+}

src/components/messageStream/AttachmentDownloadPill.tsx

@@ -5,6 +5,7 @@ import { useI18n } from "../../i18n";
 import type { Attachment } from "../../types/post";
 import { downloadAttachment } from "./utils/downloadFile";
 import { formatBytes } from "./utils/formatBytes";
+import { useToast } from "../Toast";
 
 type AttachmentDownloadPillProps = {
   postId: string;
@@ -20,15 +21,21 @@ export function AttachmentDownloadPill({
   className = "absolute left-2 top-2",
 }: AttachmentDownloadPillProps) {
   const { t } = useI18n();
+  const { showToast } = useToast();
   const [isDownloading, setIsDownloading] = useState(false);
 
-  const handleDownload = (e: MouseEvent<HTMLButtonElement>) => {
+  const handleDownload = async (e: MouseEvent<HTMLButtonElement>) => {
     e.stopPropagation();
     if (isDownloading) return;
     setIsDownloading(true);
-    void downloadAttachment(postId, attachment.id, attachment.filename)
+    try {
-      .finally(() => setIsDownloading(false))
+      await downloadAttachment(postId, attachment.id, attachment.filename);
-      .catch(() => {});
+      showToast(t("downloadOk"));
+    } catch {
+      showToast(t("downloadFail"), "error");
+    } finally {
+      setIsDownloading(false);
+    }
   };
 
   return (

src/components/messageStream/MessageBubble.tsx

@@ -35,7 +35,7 @@ export function MessageBubble({ post }: { post: Post }) {
   return (
     <div
       id={`post-${post.id}`}
-      className="mx-auto w-full max-w-[358px] md:max-w-[680px] lg:max-w-[900px] xl:max-w-[1120px]"
+      className="mx-auto w-full max-w-[358px] scroll-mt-20 md:max-w-[680px] md:scroll-mt-24 lg:max-w-[900px] xl:max-w-[1120px]"
     >
       <article
         className={`relative w-full overflow-hidden rounded-2xl bg-[#272632] text-left shadow-sm ${

src/components/messageStream/MessageStream.tsx

@@ -1,8 +1,10 @@
 import { useEffect, useMemo, useRef } from "react";
-import { useSearchParams } from "react-router-dom";
+import { useLocation, useSearchParams } from "react-router-dom";
 import { postJSON } from "../../api";
 import { useI18n } from "../../i18n";
 import type { PostScope } from "../../types/post";
+import { Reveal } from "../../motion";
+import { Skeleton } from "../Skeleton";
 import { FilterChips } from "./FilterChips";
 import { MessageBubble } from "./MessageBubble";
 import { useGroupedByDay } from "./hooks/useGroupedByDay";
@@ -15,6 +17,7 @@ export type MessageStreamProps = {
 export function MessageStream({ scope }: MessageStreamProps) {
   const { t, lang } = useI18n();
   const [sp, setSp] = useSearchParams();
+  const { hash } = useLocation();
 
   const type = sp.get("type") || "all";
   const q = (sp.get("q") || "").trim();
@@ -65,6 +68,38 @@ export function MessageStream({ scope }: MessageStreamProps) {
     return () => io.disconnect();
   }, [loadMore]);
 
+  // When arriving with a `#post-<id>` hash (e.g. from a recommended card),
+  // scroll to that bubble — loading more pages until it shows up — then give
+  // it a brief highlight so the user can see where they landed.
+  const targetPostId =
+    hash.startsWith("#post-") ? hash.slice("#post-".length) : "";
+  const handledTargetRef = useRef<string>("");
+
+  useEffect(() => {
+    handledTargetRef.current = "";
+  }, [targetPostId]);
+
+  useEffect(() => {
+    if (!targetPostId || handledTargetRef.current === targetPostId) return;
+
+    const el = document.getElementById(`post-${targetPostId}`);
+    if (el) {
+      handledTargetRef.current = targetPostId;
+      const frame = window.requestAnimationFrame(() => {
+        el.scrollIntoView({ block: "start", behavior: "smooth" });
+        el.classList.add("ark-bubble-highlight");
+        window.setTimeout(
+          () => el.classList.remove("ark-bubble-highlight"),
+          2000,
+        );
+      });
+      return () => window.cancelAnimationFrame(frame);
+    }
+
+    // Not loaded yet — keep paging until it appears or the stream is exhausted.
+    if (hasMore && !isLoading) loadMore();
+  }, [targetPostId, items, hasMore, isLoading, loadMore]);
+
   const updateParam = (key: string, value: string) => {
     const n = new URLSearchParams(sp);
     if (!value || value === "all") n.delete(key);
@@ -72,15 +107,36 @@ export function MessageStream({ scope }: MessageStreamProps) {
     setSp(n, { replace: true });
   };
 
+  const isInitialLoad = isLoading && items.length === 0;
+
   return (
     <div className="mx-auto max-w-full md:max-w-[820px] lg:max-w-[1080px] xl:max-w-[1180px]">
       <FilterChips type={type} onTypeChange={(v) => updateParam("type", v)} />
 
       <div className="flex flex-col gap-3 px-4 pt-4 md:px-0 md:pt-2">
+        {isInitialLoad ? (
+          <>
+            {Array.from({ length: 10 }).map((_, i) => (
+              <div
+                key={i}
+                className="mx-auto w-full max-w-[358px] md:max-w-[680px] lg:max-w-[900px] xl:max-w-[1120px]"
+              >
+                <Skeleton
+                  className={`rounded-2xl ${
+                    i % 3 === 0 ? "h-[220px]" : "h-[80px]"
+                  }`}
+                />
+              </div>
+            ))}
+          </>
+        ) : (
+          <>
             {groups.map((group) => (
               <div key={group.dayKey} className="flex flex-col gap-3">
-            {group.items.map((post) => (
+                {group.items.map((post, index) => (
-              <MessageBubble key={post.id} post={post} />
+                  <Reveal key={post.id} delay={Math.min(index, 8) * 0.05}>
+                    <MessageBubble post={post} />
+                  </Reveal>
                 ))}
               </div>
             ))}
@@ -107,6 +163,8 @@ export function MessageStream({ scope }: MessageStreamProps) {
             {isLoading ? (
               <div className="py-4 text-center text-xs text-neutral-500">…</div>
             ) : null}
+          </>
+        )}
 
         <div ref={sentinelRef} aria-hidden className="h-1" />
       </div>

src/components/messageStream/bubbles/AlbumBubble.tsx

@@ -10,6 +10,7 @@ import { autolink } from "../utils/autolink";
 import { downloadAttachment } from "../utils/downloadFile";
 import { formatBytes } from "../utils/formatBytes";
 import { postDisplayText } from "../utils/postText";
+import { useToast } from "../../Toast";
 
 const MAX_VISIBLE = 4;
 
@@ -32,14 +33,20 @@ function ImageListDownloadButton({
   attachment: Attachment;
 }) {
   const { t } = useI18n();
+  const { showToast } = useToast();
   const [isDownloading, setIsDownloading] = useState(false);
 
-  const handleDownload = () => {
+  const handleDownload = async () => {
     if (isDownloading) return;
     setIsDownloading(true);
-    void downloadAttachment(postId, attachment.id, attachment.filename)
+    try {
-      .finally(() => setIsDownloading(false))
+      await downloadAttachment(postId, attachment.id, attachment.filename);
-      .catch(() => {});
+      showToast(t("downloadOk"));
+    } catch {
+      showToast(t("downloadFail"), "error");
+    } finally {
+      setIsDownloading(false);
+    }
   };
 
   return (

src/components/messageStream/bubbles/FileDocBubble.tsx

@@ -11,19 +11,26 @@ import {
 } from "../utils/filenameDisplay";
 import { formatBytes } from "../utils/formatBytes";
 import { postDisplayText } from "../utils/postText";
+import { useToast } from "../../Toast";
 
 function AttachmentRow({ postId, att }: { postId: string; att: Attachment }) {
   const { t } = useI18n();
+  const { showToast } = useToast();
   const { Icon, color } = fileIcon({ mime: att.mime, filename: att.filename });
   const displayFilename = filenameWithExtension(att.filename, att.mime);
   const [isDownloading, setIsDownloading] = useState(false);
 
-  const handleDownload = () => {
+  const handleDownload = async () => {
     if (isDownloading) return;
     setIsDownloading(true);
-    void downloadAttachment(postId, att.id, displayFilename)
+    try {
-      .finally(() => setIsDownloading(false))
+      await downloadAttachment(postId, att.id, displayFilename);
-      .catch(() => {});
+      showToast(t("downloadOk"));
+    } catch {
+      showToast(t("downloadFail"), "error");
+    } finally {
+      setIsDownloading(false);
+    }
   };
 
   return (

src/components/messageStream/bubbles/VideoBubble.tsx

@@ -10,6 +10,7 @@ import { autolink } from "../utils/autolink";
 import { downloadAttachment } from "../utils/downloadFile";
 import { formatBytes } from "../utils/formatBytes";
 import { postDisplayText } from "../utils/postText";
+import { useToast } from "../../Toast";
 
 const MAX_VISIBLE = 4;
 
@@ -173,14 +174,20 @@ function AttachmentListDownloadButton({
   attachment: Attachment;
 }) {
   const { t } = useI18n();
+  const { showToast } = useToast();
   const [isDownloading, setIsDownloading] = useState(false);
 
-  const handleDownload = () => {
+  const handleDownload = async () => {
     if (isDownloading) return;
     setIsDownloading(true);
-    void downloadAttachment(postId, attachment.id, attachment.filename)
+    try {
-      .finally(() => setIsDownloading(false))
+      await downloadAttachment(postId, attachment.id, attachment.filename);
-      .catch(() => {});
+      showToast(t("downloadOk"));
+    } catch {
+      showToast(t("downloadFail"), "error");
+    } finally {
+      setIsDownloading(false);
+    }
   };
 
   return (

src/i18n.tsx

@@ -32,6 +32,7 @@ const zhDict: Dict = {
   tagPostsTitle: "#{{tag}} 相关资料",
   noTagPosts: "暂时找不到带有此标签的资料。",
   viewAll: "查看全部",
+  backToTop: "回到顶部",
   heroTitle: "ARK 官方数据库",
   heroSub:
     "集中、分类、管理 ARK 数据库，让你快速找到所需资源，推动社群共识与成长。",
@@ -42,6 +43,8 @@ const zhDict: Dict = {
   preview: "预览",
   download: "下载",
   downloading: "下载中…",
+  downloadOk: "下载完成",
+  downloadFail: "下载失败，请重试",
   share: "分享",
   langLabel: "语言",
   admin: "后台",
@@ -159,6 +162,7 @@ const enDict: Dict = {
   tagPostsTitle: "#{{tag}} related posts",
   noTagPosts: "No posts with this tag yet.",
   viewAll: "View all",
+  backToTop: "Back to top",
   heroTitle: "ARK Official Library",
   heroSub:
     "Centralize, organize, and manage the ARK library so you can find what you need fast and help the community grow together.",
@@ -169,6 +173,8 @@ const enDict: Dict = {
   preview: "Preview",
   download: "Download",
   downloading: "Downloading…",
+  downloadOk: "Download complete",
+  downloadFail: "Download failed, please retry",
   share: "Share",
   langLabel: "Language",
   admin: "Admin",

src/index.css

@@ -20,9 +20,6 @@ body {
 /* Match theme: avoid default blue accent on controls */
 :root {
   accent-color: #eeb726;
-  --animate-duration: 720ms;
-  --animate-delay: 0s;
-  --animate-repeat: 1;
 }
 
 header a,
@@ -49,26 +46,6 @@ header button {
   }
 }
 
-.ark-page-fade-in {
-  animation: ark-page-fade-in 240ms ease-out both;
-}
-
-@keyframes ark-page-fade-in {
-  from {
-    opacity: 0;
-  }
-
-  to {
-    opacity: 1;
-  }
-}
-
-@media (prefers-reduced-motion: reduce) {
-  .ark-page-fade-in {
-    animation: none;
-  }
-}
-
 /* Desktop header nav: thin scrollbar when links overflow (still 單列) */
 .header-nav-scroll {
   scrollbar-width: thin;
@@ -89,6 +66,73 @@ header button {
   box-shadow: inset 0 -2px 0 #eeb726;
 }
 
+/* Reusable skeleton placeholder with a soft shimmer sweep. */
+.ark-skeleton {
+  position: relative;
+  overflow: hidden;
+  background-color: #1d1e23;
+}
+.ark-skeleton::after {
+  content: "";
+  position: absolute;
+  inset: 0;
+  transform: translateX(-100%);
+  background: linear-gradient(
+    90deg,
+    transparent,
+    rgba(255, 255, 255, 0.05),
+    transparent
+  );
+  animation: ark-shimmer 1.5s infinite;
+}
+
+@keyframes ark-shimmer {
+  100% {
+    transform: translateX(100%);
+  }
+}
+
+/* Image fade-in: add .is-loaded on the img's onLoad handler. */
+.ark-img-fade {
+  opacity: 0;
+  transition: opacity 0.4s ease-out;
+}
+.ark-img-fade.is-loaded {
+  opacity: 1;
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .ark-skeleton::after {
+    animation: none;
+  }
+  .ark-img-fade {
+    opacity: 1;
+    transition: none;
+  }
+}
+
+/* Brief gold ring pulse when a bubble is targeted via a #post-<id> deep link. */
+.ark-bubble-highlight {
+  border-radius: 1rem;
+  animation: ark-bubble-highlight 2s ease-out both;
+}
+
+@keyframes ark-bubble-highlight {
+  0%,
+  35% {
+    box-shadow: 0 0 0 2px rgba(238, 183, 38, 0.9);
+  }
+  100% {
+    box-shadow: 0 0 0 2px rgba(238, 183, 38, 0);
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .ark-bubble-highlight {
+    animation: none;
+  }
+}
+
 .message-stream-copyable-text,
 .message-stream-copyable-text * {
   -webkit-user-select: text;

src/layouts/PublicLayout.tsx

@@ -1,7 +1,15 @@
 import { ChevronDown, Menu, Search as SearchIcon, X } from "lucide-react";
+import { AnimatePresence, m } from "framer-motion";
 import { useEffect, useRef, useState } from "react";
-import { Link, Outlet, useLocation, useNavigate } from "react-router-dom";
+import {
+  Link,
+  useLocation,
+  useNavigate,
+  useOutlet,
+} from "react-router-dom";
+import { pageTransition } from "../motion";
 import { ArkLogoMark } from "../components/ArkLogoMark";
+import { BackToTop } from "../components/BackToTop";
 import { DocumentMeta } from "../components/DocumentMeta";
 import { SearchPanel } from "../components/SearchPanel";
 import { useI18n, type Lang } from "../i18n";
@@ -53,7 +61,9 @@ function navIsActive(
 
 function navClassName(active: boolean) {
   return [
-    "shrink-0 rounded-sm px-2 py-2 text-[13px] font-medium leading-none whitespace-nowrap no-underline outline-none transition-colors",
+    "relative shrink-0 rounded-sm px-2 py-2 text-[13px] font-medium leading-none whitespace-nowrap no-underline outline-none transition-colors",
+    // Hover-only gold underline that slides in (resting/active look unchanged).
+    "after:pointer-events-none after:absolute after:inset-x-2 after:bottom-1 after:h-[2px] after:origin-left after:scale-x-0 after:rounded-full after:bg-ark-gold after:transition-transform after:duration-300 hover:after:scale-x-100 motion-reduce:after:transition-none",
     "focus-visible:ring-2 focus-visible:ring-ark-gold/90 focus-visible:ring-offset-2 focus-visible:ring-offset-ark-bg",
     active
       ? "text-ark-gold visited:text-ark-gold"
@@ -274,6 +284,7 @@ function MobileLanguageButton({
 export function PublicLayout() {
   const { t, lang, setLang } = useI18n();
   const { pathname, search, hash } = useLocation();
+  const outlet = useOutlet();
   const [open, setOpen] = useState(false);
   const [mobileSearchOpen, setMobileSearchOpen] = useState(false);
   const [q, setQ] = useState("");
@@ -606,9 +617,17 @@ export function PublicLayout() {
               : "flex-1 px-4 pb-6 pt-6 min-[440px]:px-5 sm:px-6 md:px-9 md:pb-10 md:pt-10 xl:px-0"
         }`}
       >
-        <div key={`${pathname}${search}`} className="ark-page-fade-in">
+        <AnimatePresence mode="wait" initial={false}>
-          <Outlet />
+          <m.div
-        </div>
+            key={`${pathname}${search}`}
+            variants={pageTransition}
+            initial="initial"
+            animate="enter"
+            exit="exit"
+          >
+            {outlet}
+          </m.div>
+        </AnimatePresence>
       </main>
 
       <footer className="mt-auto bg-transparent md:border-t md:border-ark-line md:bg-ark-nav/90">
@@ -654,6 +673,8 @@ export function PublicLayout() {
           />
         </div>
       </nav>
+
+      <BackToTop />
     </div>
   );
 }

src/main.tsx

@@ -1,6 +1,5 @@
 import React from "react";
 import ReactDOM from "react-dom/client";
-import "animate.css";
 import "./index.css";
 
 const adminOnly = import.meta.env.VITE_ADMIN_ONLY === "true";

src/motion/MotionProvider.tsx

@@ -0,0 +1,21 @@
+import { LazyMotion, MotionConfig, domAnimation } from "framer-motion";
+import type { ReactNode } from "react";
+
+/**
+ * Wraps the app once at the root.
+ *
+ * - `LazyMotion` + `domAnimation` keeps the framer-motion bundle small
+ *   (~feature subset, lazily loaded). Components MUST use the `m` namespace
+ *   (e.g. `m.div`) rather than `motion.*`; `strict` enforces this so we never
+ *   accidentally pull in the full bundle.
+ * - `MotionConfig reducedMotion="user"` makes every framer animation respect
+ *   the OS "reduce motion" setting automatically (transforms are dropped,
+ *   opacity is kept), so individual components don't each need to handle it.
+ */
+export function MotionProvider({ children }: { children: ReactNode }) {
+  return (
+    <LazyMotion features={domAnimation} strict>
+      <MotionConfig reducedMotion="user">{children}</MotionConfig>
+    </LazyMotion>
+  );
+}

src/motion/Reveal.tsx

@@ -0,0 +1,40 @@
+import { m } from "framer-motion";
+import type { ReactNode } from "react";
+import { fadeInUp } from "./variants";
+
+type RevealProps = {
+  children: ReactNode;
+  /** Per-item delay in seconds (e.g. index * 0.06 for a staggered list). */
+  delay?: number;
+  className?: string;
+  /** Only animate the first time it enters the viewport. */
+  once?: boolean;
+  /** Fraction of the element that must be visible to trigger (0-1). */
+  amount?: number;
+};
+
+/**
+ * Fade + lift a block in as it scrolls into view. Uses framer's `whileInView`,
+ * so it respects the global `reducedMotion="user"` config from MotionProvider
+ * (no manual guard needed). Pass an incremental `delay` for simple stagger.
+ */
+export function Reveal({
+  children,
+  delay = 0,
+  className,
+  once = true,
+  amount = 0.15,
+}: RevealProps) {
+  return (
+    <m.div
+      className={className}
+      variants={fadeInUp}
+      custom={delay}
+      initial="hidden"
+      whileInView="visible"
+      viewport={{ once, amount }}
+    >
+      {children}
+    </m.div>
+  );
+}

src/motion/index.ts

@@ -0,0 +1,12 @@
+export { MotionProvider } from "./MotionProvider";
+export { Reveal } from "./Reveal";
+export { useRevealOnScroll } from "./useRevealOnScroll";
+export {
+  EASE_OUT,
+  baseTransition,
+  fadeInUp,
+  scaleIn,
+  staggerContainer,
+  pageTransition,
+  cardHover,
+} from "./variants";

src/motion/useRevealOnScroll.ts

@@ -0,0 +1,50 @@
+import { useEffect, useRef, useState } from "react";
+
+type RevealOptions = {
+  rootMargin?: string;
+  threshold?: number;
+};
+
+/**
+ * Lightweight IntersectionObserver hook. Sets `inView` to true the first time
+ * the element enters the viewport, then stops observing (fires once). Falls
+ * back to immediately visible when IntersectionObserver is unavailable (SSR /
+ * very old browsers) so content is never hidden.
+ */
+export function useRevealOnScroll<T extends HTMLElement = HTMLDivElement>(
+  options?: RevealOptions,
+) {
+  const ref = useRef<T>(null);
+  const [inView, setInView] = useState(false);
+
+  const rootMargin = options?.rootMargin ?? "0px 0px -10% 0px";
+  const threshold = options?.threshold ?? 0.1;
+
+  useEffect(() => {
+    const el = ref.current;
+    if (!el) return;
+
+    if (typeof IntersectionObserver === "undefined") {
+      setInView(true);
+      return;
+    }
+
+    const observer = new IntersectionObserver(
+      (entries) => {
+        for (const entry of entries) {
+          if (entry.isIntersecting) {
+            setInView(true);
+            observer.disconnect();
+            break;
+          }
+        }
+      },
+      { rootMargin, threshold },
+    );
+
+    observer.observe(el);
+    return () => observer.disconnect();
+  }, [rootMargin, threshold]);
+
+  return { ref, inView };
+}

src/motion/variants.ts

@@ -0,0 +1,58 @@
+import type { Transition, Variants } from "framer-motion";
+
+/** Premium ease-out curve shared by all motion. */
+export const EASE_OUT = [0.22, 1, 0.36, 1] as const;
+
+/** Base transition for reveal-style animations. */
+export const baseTransition: Transition = {
+  duration: 0.4,
+  ease: EASE_OUT,
+};
+
+/**
+ * Fade + lift in. `visible` is a function variant so callers can pass a
+ * per-item delay via `custom` (defaults to 0, e.g. when driven by a
+ * stagger container).
+ */
+export const fadeInUp: Variants = {
+  hidden: { opacity: 0, y: 16 },
+  visible: (delay: number = 0) => ({
+    opacity: 1,
+    y: 0,
+    transition: { ...baseTransition, delay },
+  }),
+};
+
+/** Fade + subtle scale in (cards, popovers). */
+export const scaleIn: Variants = {
+  hidden: { opacity: 0, scale: 0.96 },
+  visible: (delay: number = 0) => ({
+    opacity: 1,
+    scale: 1,
+    transition: { ...baseTransition, delay },
+  }),
+};
+
+/** Parent container that staggers its children's `visible` state. */
+export const staggerContainer: Variants = {
+  hidden: {},
+  visible: {
+    transition: { staggerChildren: 0.06, delayChildren: 0.02 },
+  },
+};
+
+/** Route enter/exit transition used with AnimatePresence. */
+export const pageTransition: Variants = {
+  initial: { opacity: 0, y: 8 },
+  enter: { opacity: 1, y: 0, transition: { duration: 0.24, ease: EASE_OUT } },
+  exit: { opacity: 0, y: -6, transition: { duration: 0.16, ease: EASE_OUT } },
+};
+
+/** Springy hover lift for cards. Use rest/hover states on an `m` element. */
+export const cardHover: Variants = {
+  rest: { y: 0 },
+  hover: {
+    y: -4,
+    transition: { type: "spring", stiffness: 380, damping: 26 },
+  },
+};

src/pages/About/index.tsx

@@ -1,13 +1,18 @@
 import { useI18n } from "../../i18n";
+import { Reveal } from "../../motion";
 
 export function AboutPage() {
   const { t } = useI18n();
   return (
     <div className="mx-auto max-w-2xl space-y-6">
+      <Reveal>
         <h1 className="text-2xl font-bold">{t("aboutTitle")}</h1>
+      </Reveal>
+      <Reveal delay={0.08}>
         <p className="text-neutral-300 leading-relaxed whitespace-pre-line">
           {t("aboutIntro")}
         </p>
+      </Reveal>
     </div>
   );
 }

src/pages/Categories/index.tsx

@@ -3,8 +3,10 @@ import { Link } from "react-router-dom";
 import { getJSON, itemsOrEmpty, readJSONCache, type Category } from "../../api";
 import { CategoryIcon } from "../../components/CategoryIcon";
 import { SectionHeader } from "../../components/SectionHeader";
+import { Skeleton } from "../../components/Skeleton";
 import { langQuery, useI18n } from "../../i18n";
 import { cleanCategoryDisplayName } from "../../utils/categoryDisplay";
+import { Reveal } from "../../motion";
 
 const FIGMA_CATEGORY_ORDER = [
   "project-ppt",
@@ -70,13 +72,26 @@ export function CategoriesPage() {
     );
   }
 
+  const isLoading = cats.length === 0;
+
   return (
     <section>
       <SectionHeader title={t("categorySection")} />
       <div className="mt-7 grid grid-cols-3 gap-2 md:grid-cols-5 md:gap-3 lg:grid-cols-6 xl:grid-cols-7 xl:gap-4">
-        {cats.map((category) => (
+        {isLoading
-          <Link
+          ? Array.from({ length: 14 }).map((_, i) => (
+              <Skeleton
+                key={i}
+                className="h-[88px] rounded-xl"
+              />
+            ))
+          : cats.map((category, index) => (
+              <Reveal
                 key={category.id}
+                delay={Math.min(index, 8) * 0.05}
+                className="h-[88px]"
+              >
+                <Link
                   to={`/category/${encodeURIComponent(category.slug)}`}
                   className="flex h-[88px] min-w-0 flex-col items-center justify-center gap-2 rounded-xl border border-[#27292E] bg-[#1D1E23] px-4 py-3 text-center outline-none transition hover:border-ark-gold/55 hover:bg-[#252630] focus-visible:ring-2 focus-visible:ring-ark-gold/80 focus-visible:ring-offset-2 focus-visible:ring-offset-ark-bg"
                 >
@@ -89,6 +104,7 @@ export function CategoriesPage() {
                     {cleanCategoryDisplayName(category.name)}
                   </div>
                 </Link>
+              </Reveal>
             ))}
       </div>
     </section>

src/pages/Favorites/index.tsx

@@ -1,12 +1,13 @@
 import { Heart } from "lucide-react";
 import { Link } from "react-router-dom";
 import { useI18n } from "../../i18n";
+import { Reveal } from "../../motion";
 
 export default function Favorites() {
   const { t } = useI18n();
 
   return (
-    <div className="flex min-h-[60vh] flex-col items-center justify-center gap-5 px-4 py-12 text-center">
+    <Reveal className="flex min-h-[60vh] flex-col items-center justify-center gap-5 px-4 py-12 text-center">
       <div className="flex h-20 w-20 items-center justify-center rounded-full border border-ark-gold/30 bg-ark-gold/5">
         <Heart
           className="h-10 w-10 text-ark-gold/70"
@@ -33,6 +34,6 @@ export default function Favorites() {
       >
         {t("backToHome")}
       </Link>
-    </div>
+    </Reveal>
   );
 }

src/pages/Home/index.tsx

@@ -19,6 +19,7 @@ import {
   type PostBackedResource,
 } from "../../utils/postResourceAdapter";
 import type { Post } from "../../types/post";
+import { Reveal } from "../../motion";
 
 const FIGMA_CATEGORY_ORDER = [
   "project-ppt",
@@ -269,6 +270,7 @@ export function Home() {
         <FigmaBanner />
       </section>
 
+      <Reveal delay={0}>
       <section id="categories" className="scroll-mt-16 md:scroll-mt-24">
         <div className="px-4 md:px-0">
           <SectionHeader
@@ -342,9 +344,9 @@ export function Home() {
         </div>
 
         <div className="mt-7 hidden grid-cols-3 gap-3 min-[440px]:gap-3.5 md:grid md:grid-cols-5 md:gap-3 lg:grid-cols-6 xl:grid-cols-7 xl:gap-4">
-          {figmaOrderedCategories.map((c) => (
+          {figmaOrderedCategories.map((c, index) => (
+            <Reveal key={c.id} delay={Math.min(index, 8) * 0.05}>
               <Link
-              key={c.id}
                 to={`/category/${encodeURIComponent(c.slug)}`}
                 className="flex h-[88px] min-w-0 flex-col items-center justify-center gap-2 rounded-xl border border-[#27292E] bg-[#1D1E23] px-4 py-3 text-center outline-none transition hover:border-ark-gold/55 hover:bg-[#252630] focus-visible:ring-2 focus-visible:ring-ark-gold/80 focus-visible:ring-offset-2 focus-visible:ring-offset-ark-bg"
               >
@@ -357,10 +359,13 @@ export function Home() {
                   {cleanCategoryDisplayName(c.name)}
                 </div>
               </Link>
+            </Reveal>
           ))}
         </div>
       </section>
+      </Reveal>
 
+      <Reveal>
       <section id="official" className="scroll-mt-16 md:scroll-mt-24">
         <div className="px-4 md:px-0">
           <SectionHeader
@@ -376,7 +381,9 @@ export function Home() {
           >
             {rec.map((r, index) => (
               <div key={r.id}>
+                <Reveal delay={Math.min(index, 8) * 0.05}>
                   <RecommendedCard r={r} visualIndex={index} useFigmaDesign />
+                </Reveal>
               </div>
             ))}
           </div>
@@ -435,7 +442,9 @@ export function Home() {
           ) : null}
         </div>
       </section>
+      </Reveal>
 
+      <Reveal>
       <section id="latest" className="scroll-mt-16 md:scroll-mt-24">
         <div className="px-4 md:px-0">
           <SectionHeader
@@ -490,8 +499,10 @@ export function Home() {
           ) : null}
         </div>
       </section>
+      </Reveal>
 
       {hasPopular ? (
+        <Reveal>
         <section id="popular" className="scroll-mt-16 md:scroll-mt-24">
           <div className="px-4 md:px-0">
             <SectionHeader
@@ -521,6 +532,7 @@ export function Home() {
             ))}
           </div>
         </section>
+        </Reveal>
       ) : null}
     </div>
   );

tailwind.config.js

@@ -14,6 +14,24 @@ export default {
           muted: "#8f9099",
         },
       },
+      keyframes: {
+        shimmer: {
+          "100%": { transform: "translateX(100%)" },
+        },
+        "fade-in-up": {
+          from: { opacity: "0", transform: "translateY(16px)" },
+          to: { opacity: "1", transform: "translateY(0)" },
+        },
+        "scale-in": {
+          from: { opacity: "0", transform: "scale(0.96)" },
+          to: { opacity: "1", transform: "scale(1)" },
+        },
+      },
+      animation: {
+        shimmer: "shimmer 1.5s infinite",
+        "fade-in-up": "fade-in-up 0.5s cubic-bezier(0.22, 1, 0.36, 1) both",
+        "scale-in": "scale-in 0.4s cubic-bezier(0.22, 1, 0.36, 1) both",
+      },
       fontFamily: {
         sans: [
           "Noto Sans SC",