diff --git a/app/web/src/components/pages/WatchBody.tsx b/app/web/src/components/pages/WatchBody.tsx
index 1fc479d..0b966cd 100644
--- a/app/web/src/components/pages/WatchBody.tsx
+++ b/app/web/src/components/pages/WatchBody.tsx
@@ -3,7 +3,7 @@ import { t } from "@app/i18n";
 import { Button } from "@app/ui";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import Artplayer from "artplayer";
-import { useEffect, useMemo, useRef, useState } from "react";
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { parseDanmakuXml, startDanmakuLoop } from "~/lib/danmaku-render";
 import { createTRPCReactClient, trpc } from "~/lib/trpc";
 
@@ -11,6 +11,12 @@ const DANMAKU_SETTINGS_KEY = "media-danmaku-settings";
 
 type DanmakuPrefs = { enabled: boolean; opacity: number };
 
+type ProgressInput = {
+    mediaItemId: string;
+    positionMs: number;
+    durationMs: number;
+};
+
 function readDanmakuPrefs(): DanmakuPrefs {
     const fallback: DanmakuPrefs = { enabled: true, opacity: 0.8 };
     try {
@@ -27,6 +33,31 @@ function readDanmakuPrefs(): DanmakuPrefs {
     }
 }
 
+/** 页面卸载时 fetch 可能被取消，用 keepalive 走与 httpBatchLink 相同的批格式兜底 */
+function sendProgressBeacon(input: ProgressInput) {
+    const url = "/api/trpc/media.playbackReport?batch=1";
+    const body = JSON.stringify({ 0: input });
+    try {
+        if (typeof navigator !== "undefined" && typeof navigator.sendBeacon === "function") {
+            const ok = navigator.sendBeacon(url, new Blob([body], { type: "application/json" }));
+            if (ok) return;
+        }
+    } catch {
+        /* fall through */
+    }
+    try {
+        void fetch(url, {
+            method: "POST",
+            headers: { "content-type": "application/json" },
+            body,
+            keepalive: true,
+            credentials: "same-origin",
+        });
+    } catch {
+        /* noop */
+    }
+}
+
 function WatchInner(props: { locale: Locale; mediaItemId: string }) {
     const { locale, mediaItemId } = props;
     const wrapperRef = useRef<HTMLDivElement>(null);
@@ -87,12 +118,23 @@ function WatchInner(props: { locale: Locale; mediaItemId: string }) {
         };
         art.on("video:loadedmetadata", seekToStart);
 
-        const reportNow = () => {
-            reportRef.current.mutate({
+        const snapshot = (): ProgressInput | null => {
+            if (!art.duration) return null;
+            return {
                 mediaItemId,
                 positionMs: Math.floor((art.currentTime || 0) * 1000),
                 durationMs: Math.floor((art.duration || 0) * 1000),
-            });
+            };
+        };
+        const reportNow = () => {
+            const input = snapshot();
+            if (input) reportRef.current.mutate(input);
+        };
+        const flushUnload = () => {
+            const input = snapshot();
+            if (!input) return;
+            reportRef.current.mutate(input);
+            sendProgressBeacon(input);
         };
 
         let timer: ReturnType<typeof setInterval> | null = null;
@@ -115,8 +157,17 @@ function WatchInner(props: { locale: Locale; mediaItemId: string }) {
             reportNow();
         });
 
+        const onVisibility = () => {
+            if (document.visibilityState === "hidden") flushUnload();
+        };
+        window.addEventListener("pagehide", flushUnload);
+        document.addEventListener("visibilitychange", onVisibility);
+
         return () => {
+            window.removeEventListener("pagehide", flushUnload);
+            document.removeEventListener("visibilitychange", onVisibility);
             if (timer) clearInterval(timer);
+            flushUnload();
             art.destroy(false);
             artRef.current = null;
         };
@@ -148,14 +199,58 @@ function WatchInner(props: { locale: Locale; mediaItemId: string }) {
         return stop;
     }, [items, danmakuOpacity]);
 
-    function onImportXml(file: File) {
-        const reader = new FileReader();
-        reader.onload = () => {
-            const text = String(reader.result ?? "");
-            setLocalXml(text);
-            importMeta.mutate({ mediaItemId, byteSize: file.size });
-        };
-        reader.readAsText(file);
+    const onImportXml = useCallback(
+        (file: File) => {
+            const reader = new FileReader();
+            reader.onload = () => {
+                const text = String(reader.result ?? "");
+                setLocalXml(text);
+                importMeta.mutate({ mediaItemId, byteSize: file.size });
+            };
+            reader.readAsText(file);
+        },
+        [importMeta, mediaItemId],
+    );
+
+    const goLibrary = useCallback(() => {
+        window.location.href = `/${locale}/library`;
+    }, [locale]);
+
+    if (detail.isError) {
+        return (
+            <div className="space-y-3">
+                <h1 className="text-xl font-semibold">{t(locale, "watch.loadError")}</h1>
+                <p className="text-sm text-muted-foreground">{t(locale, "watch.loadErrorHint")}</p>
+                <div className="flex gap-2">
+                    <Button size="sm" onClick={() => detail.refetch()}>
+                        {t(locale, "error.retry")}
+                    </Button>
+                    <Button size="sm" variant="ghost" onClick={goLibrary}>
+                        {t(locale, "watch.backToLibrary")}
+                    </Button>
+                </div>
+            </div>
+        );
+    }
+
+    if (!detail.data) {
+        if (detail.isPending) {
+            return (
+                <div className="space-y-3">
+                    <h1 className="text-xl font-semibold">{t(locale, "watch.loading")}</h1>
+                    <div className="aspect-video w-full animate-pulse rounded-lg bg-muted" />
+                </div>
+            );
+        }
+        return (
+            <div className="space-y-3">
+                <h1 className="text-xl font-semibold">{t(locale, "watch.notFound")}</h1>
+                <p className="text-sm text-muted-foreground">{t(locale, "watch.notFoundHint")}</p>
+                <Button size="sm" variant="ghost" onClick={goLibrary}>
+                    {t(locale, "watch.backToLibrary")}
+                </Button>
+            </div>
+        );
     }
 
     const sourceLabel = !danmakuOn
@@ -173,9 +268,7 @@ function WatchInner(props: { locale: Locale; mediaItemId: string }) {
     return (
         <div className="space-y-3">
             <div className="flex flex-wrap items-center gap-2">
-                <h1 className="text-xl font-semibold">
-                    {detail.data?.title ?? t(locale, "watch.loading")}
-                </h1>
+                <h1 className="text-xl font-semibold">{detail.data.title}</h1>
                 <div className="ml-auto flex gap-2">
                     <Button
                         size="sm"
@@ -197,13 +290,7 @@ function WatchInner(props: { locale: Locale; mediaItemId: string }) {
                             }}
                         />
                     </label>
-                    <Button
-                        size="sm"
-                        variant="ghost"
-                        onClick={() => {
-                            window.location.href = `/${locale}/library`;
-                        }}
-                    >
+                    <Button size="sm" variant="ghost" onClick={goLibrary}>
                         {t(locale, "watch.backToLibrary")}
                     </Button>
                 </div>
diff --git a/packages/i18n/src/messages/en.ts b/packages/i18n/src/messages/en.ts
index 884141e..7e4b3c1 100644
--- a/packages/i18n/src/messages/en.ts
+++ b/packages/i18n/src/messages/en.ts
@@ -83,6 +83,10 @@ export const en: Record<MessageKey, string> = {
     "watch.danmakuCount": "{count} danmaku",
     "watch.backToLibrary": "Back to library",
     "watch.progressHint": "Progress saved every ~5s",
+    "watch.loadError": "Failed to load",
+    "watch.loadErrorHint": "Could not load this media. Check the link or try again later.",
+    "watch.notFound": "Media not found",
+    "watch.notFoundHint": "This media may have been removed, or you do not have access.",
 
     "danmaku.title": "Danmaku settings",
     "danmaku.opacity": "Opacity",
diff --git a/packages/i18n/src/messages/zh-CN.ts b/packages/i18n/src/messages/zh-CN.ts
index c26f4ee..95fd764 100644
--- a/packages/i18n/src/messages/zh-CN.ts
+++ b/packages/i18n/src/messages/zh-CN.ts
@@ -84,6 +84,10 @@ export const zhCN = {
     "watch.danmakuCount": "弹幕 {count} 条",
     "watch.backToLibrary": "返回媒体库",
     "watch.progressHint": "进度约每 5 秒保存",
+    "watch.loadError": "加载失败",
+    "watch.loadErrorHint": "无法加载该媒体，请检查链接或稍后重试。",
+    "watch.notFound": "媒体不存在",
+    "watch.notFoundHint": "该媒体可能已被删除，或你没有访问权限。",
 
     "danmaku.title": "弹幕设置",
     "danmaku.opacity": "不透明度",