diff --git a/qwen3-tts-frontend/src/components/AudioPlayer.tsx b/qwen3-tts-frontend/src/components/AudioPlayer.tsx
index 805d153..1356548 100644
--- a/qwen3-tts-frontend/src/components/AudioPlayer.tsx
+++ b/qwen3-tts-frontend/src/components/AudioPlayer.tsx
@@ -85,11 +85,15 @@ const AudioPlayer = memo(({ audioUrl, jobId }: AudioPlayerProps) => {
   }, [])
 
   const handleDownload = useCallback(() => {
-    const link = document.createElement('a')
-    link.href = blobUrl || audioUrl
-    link.download = `tts-${jobId}-${Date.now()}.wav`
-    link.click()
-  }, [blobUrl, audioUrl, jobId])
+    if (useMobileMode) {
+      window.open(blobUrl || audioUrl, '_blank')
+    } else {
+      const link = document.createElement('a')
+      link.href = blobUrl || audioUrl
+      link.download = `tts-${jobId}-${Date.now()}.wav`
+      link.click()
+    }
+  }, [blobUrl, audioUrl, jobId, useMobileMode])
 
   if (isLoading) {
     return (
@@ -131,6 +135,8 @@ const AudioPlayer = memo(({ audioUrl, jobId }: AudioPlayerProps) => {
         customVolumeControls={[]}
         showJumpControls={false}
         volume={1}
+        preload="metadata"
+        autoPlayAfterSrcChange={false}
       />
     </div>
   )
diff --git a/qwen3-tts-frontend/src/components/ui/alert-dialog.tsx b/qwen3-tts-frontend/src/components/ui/alert-dialog.tsx
index 8722561..82cbd5f 100644
--- a/qwen3-tts-frontend/src/components/ui/alert-dialog.tsx
+++ b/qwen3-tts-frontend/src/components/ui/alert-dialog.tsx
@@ -34,7 +34,7 @@ const AlertDialogContent = React.forwardRef<
     <AlertDialogPrimitive.Content
       ref={ref}
       className={cn(
-        "fixed left-[50%] top-[50%] z-50 grid w-full max-w-lg translate-x-[-50%] translate-y-[-50%] gap-4 border bg-background p-6 shadow-lg duration-200 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[state=closed]:slide-out-to-left-1/2 data-[state=closed]:slide-out-to-top-[48%] data-[state=open]:slide-in-from-left-1/2 data-[state=open]:slide-in-from-top-[48%] sm:rounded-lg",
+        "fixed left-[50%] top-[50%] z-[51] grid w-full max-w-lg translate-x-[-50%] translate-y-[-50%] gap-4 border bg-background p-6 shadow-lg duration-200 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[state=closed]:slide-out-to-left-1/2 data-[state=closed]:slide-out-to-top-[48%] data-[state=open]:slide-in-from-left-1/2 data-[state=open]:slide-in-from-top-[48%] sm:rounded-lg",
         className
       )}
       {...props}
diff --git a/qwen3-tts-frontend/src/components/ui/dialog.tsx b/qwen3-tts-frontend/src/components/ui/dialog.tsx
index c23630e..05e8e8d 100644
--- a/qwen3-tts-frontend/src/components/ui/dialog.tsx
+++ b/qwen3-tts-frontend/src/components/ui/dialog.tsx
@@ -36,7 +36,7 @@ const DialogContent = React.forwardRef<
     <DialogPrimitive.Content
       ref={ref}
       className={cn(
-        "fixed left-[50%] top-[50%] z-50 grid w-full max-w-lg translate-x-[-50%] translate-y-[-50%] gap-4 border bg-background p-6 shadow-lg duration-200 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[state=closed]:slide-out-to-left-1/2 data-[state=closed]:slide-out-to-top-[48%] data-[state=open]:slide-in-from-left-1/2 data-[state=open]:slide-in-from-top-[48%] sm:rounded-lg",
+        "fixed left-[50%] top-[50%] z-[51] grid w-full max-w-lg translate-x-[-50%] translate-y-[-50%] gap-4 border bg-background p-6 shadow-lg duration-200 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[state=closed]:slide-out-to-left-1/2 data-[state=closed]:slide-out-to-top-[48%] data-[state=open]:slide-in-from-left-1/2 data-[state=open]:slide-in-from-top-[48%] sm:rounded-lg",
         className
       )}
       {...props}
diff --git a/qwen3-tts-frontend/src/index.css b/qwen3-tts-frontend/src/index.css
index 80c6de8..14f64fc 100644
--- a/qwen3-tts-frontend/src/index.css
+++ b/qwen3-tts-frontend/src/index.css
@@ -53,9 +53,9 @@
   }
 
   .dark {
-    --background: 0 0% 5%;
+    --background: 0 0% 10%;
     --foreground: 0 0% 98%;
-    --card: 0 0% 5%;
+    --card: 0 0% 14%;
     --card-foreground: 0 0% 98%;
     --popover: 0 0% 5%;
     --popover-foreground: 0 0% 98%;