diff --git a/components/TextInputArea.tsx b/components/TextInputArea.tsx
index b644825..1cd441c 100644
--- a/components/TextInputArea.tsx
+++ b/components/TextInputArea.tsx
@@ -287,6 +287,7 @@ const TextInputArea = forwardRef<HTMLTextAreaElement, TextInputAreaProps>((props
                 <button
                   type="button"
                   onClick={handleCopy}
+                  aria-label={t('textInputArea.copyContent')}
                   className="p-1 h-7 w-7 flex items-center justify-center rounded-md text-muted-foreground hover:text-foreground hover:bg-background/80 transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring"
                 >
                   <Copy className="h-4 w-4" />
@@ -296,6 +297,7 @@ const TextInputArea = forwardRef<HTMLTextAreaElement, TextInputAreaProps>((props
                 <button
                   type="button"
                   onClick={handleClear}
+                  aria-label={t('textInputArea.clear')}
                   className="p-1 h-7 w-7 flex items-center justify-center rounded-md text-muted-foreground hover:text-destructive hover:bg-destructive/10 transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring"
                 >
                   <X className="h-4 w-4" />
diff --git a/pages/Base64Converter/Base64ConverterSection.tsx b/pages/Base64Converter/Base64ConverterSection.tsx
new file mode 100644
index 0000000..5543201
--- /dev/null
+++ b/pages/Base64Converter/Base64ConverterSection.tsx
@@ -0,0 +1,255 @@
+import { Image as ImageIcon, Trash2, Upload } from 'lucide-react';
+import TextInputArea from '@/components/TextInputArea';
+import { useTranslation } from 'react-i18next';
+import CopyButton from '@/components/CopyButton';
+import DecodeResultPaper from '@/components/DecodeResultPaper';
+import { Button } from '@/components/ui/button';
+import { downloadBlob, formatFileSize } from '@/utils/base64Converter';
+import { useStorageState } from '@/utils/useStorageState';
+import type { Base64ConvertDirection } from '@/types/storage';
+import SwitchButtonGroup from '@/components/SwitchButtonGroup';
+import { useBase64Converter } from './useBase64Converter';
+import { cn } from '@/lib/utils';
+
+const isValidDirection = (val: unknown): val is Base64ConvertDirection =>
+  val === 'encode' || val === 'decode';
+
+interface Base64ConverterSectionProps {
+  mode: 'file' | 'image';
+}
+
+export default function Base64ConverterSection({ mode }: Base64ConverterSectionProps) {
+  const { t } = useTranslation('base64Converter');
+
+  const [direction, setDirection] = useStorageState(
+    `base64Converter/${mode}Mode/direction`,
+    'encode',
+    isValidDirection,
+  );
+
+  const {
+    result,
+    info,
+    isLoading,
+    isDragging,
+    setIsDragging,
+    fileInputRef,
+    encodeError,
+    decodeInput,
+    setDecodeInput,
+    decoded,
+    decodeError,
+    decodedFileName,
+    setCustomFileName,
+    resetAll,
+    safeFileSelect,
+    maxFileSizeStr,
+  } = useBase64Converter({ mode });
+
+  const handleDirectionChange = (next: Base64ConvertDirection) => {
+    if (!next || next === direction) return;
+    resetAll();
+    setDirection(next);
+  };
+
+  const handleDownload = () => {
+    if (decoded) downloadBlob(decoded.blob, decodedFileName);
+  };
+
+  return (
+    <div className="w-full flex flex-col space-y-4 animate-in fade-in duration-300">
+      <div className="flex h-11 items-center px-1.5 bg-secondary/40 rounded-xl border border-border/60 w-fit">
+        <SwitchButtonGroup
+          value={direction}
+          options={[
+            { value: 'encode', label: t('encode') },
+            { value: 'decode', label: t('decode') },
+          ]}
+          onChange={handleDirectionChange}
+          size="small"
+        />
+      </div>
+
+      {direction === 'encode' ? (
+        <div className="flex flex-col space-y-4">
+          <div
+            onDragOver={(e) => {
+              e.preventDefault();
+              setIsDragging(true);
+            }}
+            onDragLeave={() => setIsDragging(false)}
+            onDrop={(e) => {
+              e.preventDefault();
+              setIsDragging(false);
+              const file = e.dataTransfer.files[0];
+              if (file) safeFileSelect(file);
+            }}
+            onClick={() => fileInputRef.current?.click()}
+            className={cn(
+              'flex flex-col items-center justify-center min-h-[190px] border-2 border-dashed rounded-2xl p-8 cursor-pointer transition-all duration-300',
+              isDragging
+                ? 'border-primary bg-primary/10'
+                : info
+                  ? 'border-primary/60 bg-primary/5'
+                  : 'border-border bg-muted/40 hover:border-primary/80 hover:bg-muted/70',
+            )}
+          >
+            <input
+              ref={fileInputRef}
+              type="file"
+              accept={mode === 'image' ? 'image/*' : undefined}
+              hidden
+              onChange={(e) => {
+                const file = e.target.files?.[0];
+                if (file) safeFileSelect(file);
+              }}
+            />
+            {isLoading ? (
+              <div className="w-9 h-9 border-3 border-primary/20 border-t-primary rounded-full animate-spin" />
+            ) : info ? (
+              <div className="flex flex-col items-center gap-1.5 text-center w-full animate-in fade-in duration-200">
+                {mode === 'image' && result && (
+                  <div className="relative p-1 border border-border bg-background rounded-lg shadow-sm mb-1 max-w-[180px] overflow-hidden">
+                    <img
+                      src={result.output}
+                      alt="preview"
+                      className="max-h-32 w-full object-contain rounded"
+                    />
+                  </div>
+                )}
+                <Upload
+                  className={cn('w-8 h-8 text-primary', mode === 'file' && 'animate-bounce')}
+                />
+                <span className="text-sm font-bold text-foreground/90 max-w-[280px] truncate">
+                  {info.name}
+                </span>
+                <span className="text-xs text-muted-foreground/80 font-mono tabular-nums">
+                  {formatFileSize(info.size)} · {info.type}
+                </span>
+                <span className="text-[11px] font-medium text-primary/80 mt-1">
+                  {t('clickOrDropToReplace')}
+                </span>
+              </div>
+            ) : (
+              <div className="flex flex-col items-center gap-1.5 text-center">
+                {mode === 'image' ? (
+                  <ImageIcon className="w-8 h-8 text-muted-foreground/60" />
+                ) : (
+                  <Upload className="w-8 h-8 text-muted-foreground/60" />
+                )}
+                <span className="text-xs font-bold text-foreground/80">
+                  {mode === 'image' ? t('clickOrDropToImage') : t('clickOrDropToFile')}
+                </span>
+                <span className="text-[10px] font-medium text-muted-foreground/60">
+                  {t('maxFileSize', { max: maxFileSizeStr })}
+                </span>
+                {mode === 'image' && (
+                  <span className="text-[10px] font-medium text-muted-foreground/50">
+                    {t('supportedFormats')}
+                  </span>
+                )}
+              </div>
+            )}
+          </div>
+
+          {encodeError && (
+            <div className="p-3.5 bg-destructive/10 border border-destructive/20 rounded-xl text-xs font-semibold text-destructive">
+              {encodeError}
+            </div>
+          )}
+
+          {result && (
+            <div className="p-4 rounded-2xl bg-card border border-border shadow-sm flex flex-col space-y-3">
+              <div className="flex justify-between items-center select-none">
+                <span className="text-[10px] font-bold uppercase tracking-wider text-muted-foreground/90">
+                  {t('base64Output')}
+                </span>
+                <div className="flex gap-2">
+                  <CopyButton
+                    text={result.rawBase64}
+                    tooltip={t('copyRaw')}
+                    className="h-6 px-2 rounded-md border text-[10px] font-bold"
+                  />
+                  <CopyButton
+                    text={result.output}
+                    tooltip={t('copyDataUri')}
+                    className="h-6 px-2 rounded-md border text-[10px] font-bold"
+                  />
+                </div>
+              </div>
+              <TextInputArea
+                readOnly
+                value={
+                  result.output.length > 2000
+                    ? `${result.output.substring(0, 2000)}...`
+                    : result.output
+                }
+                showClear={false}
+                minRows={4}
+              />
+              <div className="flex items-center justify-between font-mono text-[10px] text-muted-foreground/70 select-none pt-1">
+                <div className="flex gap-4 items-center tabular-nums">
+                  <span>
+                    {t('originalSize')}:{' '}
+                    <span className="font-semibold text-foreground/80">
+                      {formatFileSize(result.originalBytes)}
+                    </span>
+                  </span>
+                  <span className="text-border/60">|</span>
+                  <span>
+                    {t('encodedSize')}:{' '}
+                    <span className="font-semibold text-foreground/80">
+                      {formatFileSize(result.outputBytes)}
+                    </span>
+                  </span>
+                </div>
+                <Button
+                  variant="ghost"
+                  size="sm"
+                  onClick={resetAll}
+                  className="h-7 rounded-md text-muted-foreground hover:text-destructive text-[11px] gap-1 px-2"
+                >
+                  <Trash2 className="w-3.5 h-3.5" />
+                  {t('clear')}
+                </Button>
+              </div>
+            </div>
+          )}
+        </div>
+      ) : (
+        <div className="flex flex-col space-y-4">
+          <TextInputArea
+            placeholder={t('decodeBase64Placeholder')}
+            value={decodeInput}
+            onChange={setDecodeInput}
+            externalError={decodeError || undefined}
+            showClear={true}
+            allowCopy={true}
+            minRows={6}
+            onClear={resetAll}
+          />
+          {decoded && (
+            <DecodeResultPaper
+              title={mode === 'image' ? t('decodedImageOutput') : t('decodedFileOutput')}
+              mimeType={decoded.mimeType}
+              blobSize={decoded.blob.size}
+              fileName={decodedFileName}
+              onFileNameChange={setCustomFileName}
+              onDownload={handleDownload}
+            >
+              {mode === 'image' && (
+                <div className="relative p-1.5 border border-border bg-background dark:bg-muted/10 rounded-xl max-w-[220px] mb-3 overflow-hidden shadow-sm">
+                  <img
+                    src={`data:${decoded.mimeType};base64,${decoded.rawBase64}`}
+                    alt="decoded preview"
+                    className="max-h-40 w-full rounded-lg object-contain bg-[linear-gradient(45deg,#ccc_25%,transparent_25%),linear-gradient(-45deg,#ccc_25%,transparent_25%),linear-gradient(45deg,transparent_75%,#ccc_75%),linear-gradient(-45deg,transparent_75%,#ccc_75%)] bg-[size:10px_10px] bg-[position:0_0,0_5px,5px_-5px,-5px_0] dark:bg-none"
+                  />
+                </div>
+              )}
+            </DecodeResultPaper>
+          )}
+        </div>
+      )}
+    </div>
+  );
+}
diff --git a/pages/Base64Converter/FileMode.tsx b/pages/Base64Converter/FileMode.tsx
index 685bdda..5cf89a1 100644
--- a/pages/Base64Converter/FileMode.tsx
+++ b/pages/Base64Converter/FileMode.tsx
@@ -1,32 +1,15 @@
-import { useCallback, useMemo, useRef, useState } from 'react';
-import { Upload, Trash2 } from 'lucide-react';
+import { Trash2, Upload } from 'lucide-react';
 import TextInputArea from '@/components/TextInputArea';
-import type { ToolbarAction } from '@/components/TextInputArea';
 import { useTranslation } from 'react-i18next';
 import CopyButton from '@/components/CopyButton';
 import DecodeResultPaper from '@/components/DecodeResultPaper';
-import {
-  fileToBase64,
-  isFileSizeValid,
-  formatFileSize,
-  base64ToBlob,
-  downloadBlob,
-  MAX_FILE_SIZE,
-} from '@/utils/base64Converter';
-import type { Base64ToBlobResult, FileToBase64Result } from '@/utils/base64Converter';
+import { Button } from '@/components/ui/button';
+import { downloadBlob, formatFileSize, MAX_FILE_SIZE } from '@/utils/base64Converter';
 import { useStorageState } from '@/utils/useStorageState';
 import type { Base64ConvertDirection } from '@/types/storage';
 import SwitchButtonGroup from '@/components/SwitchButtonGroup';
-
-interface FileInfo {
-  name: string;
-  size: number;
-  type: string;
-}
-
-const ERROR_MESSAGE_TO_I18N: Record<string, string> = {
-  'Invalid Base64 string': 'invalidBase64',
-};
+import { useBase64Converter } from './useBase64Converter'; // 💡 斩断重复代码
+import { cn } from '@/lib/utils';
 
 const isValidDirection = (val: unknown): val is Base64ConvertDirection =>
   val === 'encode' || val === 'decode';
@@ -39,151 +22,70 @@ export default function FileMode() {
     isValidDirection,
   );
 
-  // encode state
-  const [result, setResult] = useState<FileToBase64Result | null>(null);
-  const [info, setInfo] = useState<FileInfo | null>(null);
-  const [isLoading, setIsLoading] = useState(false);
-  const [isDragging, setIsDragging] = useState(false);
-  const fileInputRef = useRef<HTMLInputElement>(null);
-  const cancelRef = useRef(false);
-
-  // decode state
-  const [decodeInput, setDecodeInput] = useState('');
-  const [decoded, setDecoded] = useState<Base64ToBlobResult | null>(null);
-  const [decodedFileName, setDecodedFileName] = useState('');
-
-  // shared
-  const [error, setError] = useState<string | null>(null);
-
-  const resetAll = useCallback(() => {
-    cancelRef.current = true;
-    setResult(null);
-    setInfo(null);
-    setIsLoading(false);
-    setDecodeInput('');
-    setDecoded(null);
-    setDecodedFileName('');
-    setError(null);
-    if (fileInputRef.current) fileInputRef.current.value = '';
-  }, []);
-
-  const handleClear = () => {
-    resetAll();
-  };
-
-  const handleDirectionChange = (next: Base64ConvertDirection) => {
-    if (next === direction) return;
-    resetAll();
-    setDirection(next);
-  };
-
-  const handleFileSelect = async (file: File) => {
-    cancelRef.current = false;
-    setError(null);
-    setResult(null);
-    setInfo(null);
-
-    if (!isFileSizeValid(file.size)) {
-      setError(t('fileSizeExceeded', { max: `${MAX_FILE_SIZE / 1024 / 1024} MB` }));
-      return;
-    }
-
-    setInfo({
-      name: file.name,
-      size: file.size,
-      type: file.type || 'application/octet-stream',
-    });
-    setIsLoading(true);
-
-    try {
-      const res = await fileToBase64(file);
-      if (!cancelRef.current) setResult(res);
-    } catch (e) {
-      if (!cancelRef.current) {
-        setError(e instanceof Error ? e.message : t('conversionFailed'));
-      }
-    } finally {
-      if (!cancelRef.current) setIsLoading(false);
-    }
-  };
-
-  const handleDragOver = (e: React.DragEvent) => {
-    e.preventDefault();
-    e.stopPropagation();
-    setIsDragging(true);
-  };
-
-  const handleDragLeave = (e: React.DragEvent) => {
-    e.preventDefault();
-    e.stopPropagation();
-    setIsDragging(false);
-  };
-
-  const handleDrop = (e: React.DragEvent) => {
-    e.preventDefault();
-    e.stopPropagation();
-    setIsDragging(false);
-    const file = e.dataTransfer.files[0];
-    if (file) handleFileSelect(file);
-  };
+  const {
+    result,
+    info,
+    isLoading,
+    isDragging,
+    setIsDragging,
+    fileInputRef,
+    encodeError,
+    decodeInput,
+    setDecodeInput,
+    decoded,
+    decodeError,
+    decodedFileName,
+    setCustomFileName,
+    resetAll,
+    safeFileSelect,
+  } = useBase64Converter({ mode: 'file' });
 
   const handleDownload = () => {
-    if (!decoded) return;
-    downloadBlob(decoded.blob, decodedFileName || `decoded${decoded.suggestedExtension}`);
+    if (decoded) downloadBlob(decoded.blob, decodedFileName);
   };
 
-  const actions: ToolbarAction[] = useMemo(
-    () => [
-      {
-        key: 'decode',
-        label: t('decode'),
-        type: 'primary',
-        position: 'bottom',
-        disabled: (value: string) => !value.trim(),
-        onClick: (value: string, helpers) => {
-          helpers.setError('');
-          setDecoded(null);
-          try {
-            const res = base64ToBlob(value);
-            setDecoded(res);
-            setDecodedFileName(`decoded${res.suggestedExtension}`);
-          } catch (e) {
-            const message = e instanceof Error ? e.message : '';
-            const i18nKey = ERROR_MESSAGE_TO_I18N[message];
-            helpers.setError(i18nKey ? t(i18nKey) : message || t('conversionFailed'));
-          }
-        },
-      },
-    ],
-    [t],
-  );
-
   return (
-    <>
-      <SwitchButtonGroup
-        value={direction}
-        options={[
-          { value: 'encode', label: t('encode') },
-          { value: 'decode', label: t('decode') },
-        ]}
-        onChange={handleDirectionChange}
-        size="small"
-      />
+    <div className="w-full flex flex-col space-y-4 animate-in fade-in duration-300">
+      <div className="flex h-11 items-center px-1.5 bg-secondary/40 rounded-xl border border-border/60 w-fit">
+        <SwitchButtonGroup
+          value={direction}
+          options={[
+            { value: 'encode', label: t('encode') },
+            { value: 'decode', label: t('decode') },
+          ]}
+          onChange={(next) => {
+            if (next && next !== direction) {
+              resetAll();
+              setDirection(next);
+            }
+          }}
+          size="small"
+        />
+      </div>
 
-      {direction === 'encode' && (
-        <>
+      {direction === 'encode' ? (
+        <div className="flex flex-col space-y-4">
           <div
-            onDragOver={handleDragOver}
-            onDragLeave={handleDragLeave}
-            onDrop={handleDrop}
+            onDragOver={(e) => {
+              e.preventDefault();
+              setIsDragging(true);
+            }}
+            onDragLeave={() => setIsDragging(false)}
+            onDrop={(e) => {
+              e.preventDefault();
+              setIsDragging(false);
+              const file = e.dataTransfer.files[0];
+              if (file) safeFileSelect(file);
+            }}
             onClick={() => fileInputRef.current?.click()}
-            className={`flex flex-col items-center justify-center min-h-[180px] border-2 border-dashed rounded-xl p-8 cursor-pointer transition-all duration-200 ${
+            className={cn(
+              'flex flex-col items-center justify-center min-h-[190px] border-2 border-dashed rounded-2xl p-8 cursor-pointer transition-all duration-300',
               isDragging
                 ? 'border-primary bg-primary/10'
                 : info
-                  ? 'border-primary bg-primary/5'
-                  : 'border-input bg-muted hover:border-primary hover:bg-primary/5'
-            }`}
+                  ? 'border-primary/60 bg-primary/5'
+                  : 'border-border bg-muted/40 hover:border-primary/80 hover:bg-muted/70',
+            )}
           >
             <input
               ref={fileInputRef}
@@ -191,49 +93,63 @@ export default function FileMode() {
               hidden
               onChange={(e) => {
                 const file = e.target.files?.[0];
-                if (file) handleFileSelect(file);
+                if (file) safeFileSelect(file);
               }}
             />
             {isLoading ? (
-              <div className="w-10 h-10 border-4 border-primary/30 border-t-primary rounded-full animate-spin" />
+              <div className="w-9 h-9 border-3 border-primary/20 border-t-primary rounded-full animate-spin" />
             ) : info ? (
-              <div className="flex flex-col items-center gap-1">
-                <Upload className="w-10 h-10 text-primary" />
-                <span className="text-sm font-bold">{info.name}</span>
-                <span className="text-xs text-muted-foreground">
+              <div className="flex flex-col items-center gap-1.5 text-center">
+                <Upload className="w-8 h-8 text-primary animate-bounce" />
+                <span className="text-sm font-bold text-foreground/90 max-w-[280px] truncate">
+                  {info.name}
+                </span>
+                <span className="text-xs text-muted-foreground/80 font-mono tabular-nums">
                   {formatFileSize(info.size)} · {info.type}
                 </span>
-                <span className="text-xs text-muted-foreground">{t('clickOrDropToReplace')}</span>
+                <span className="text-[11px] font-medium text-primary/80 mt-1">
+                  {t('clickOrDropToReplace')}
+                </span>
               </div>
             ) : (
-              <div className="flex flex-col items-center gap-1">
-                <Upload className="w-10 h-10 text-muted-foreground" />
-                <span className="text-sm text-muted-foreground font-semibold">
+              <div className="flex flex-col items-center gap-1.5 text-center">
+                <Upload className="w-8 h-8 text-muted-foreground/60" />
+                <span className="text-xs font-bold text-foreground/80">
                   {t('clickOrDropToFile')}
                 </span>
-                <span className="text-xs text-muted-foreground">
+                <span className="text-[10px] font-medium text-muted-foreground/60">
                   {t('maxFileSize', { max: `${MAX_FILE_SIZE / 1024 / 1024} MB` })}
                 </span>
               </div>
             )}
           </div>
 
-          {error && (
+          {encodeError && (
             <div
               role="alert"
-              className="p-3 rounded-lg bg-red-50 border border-red-200 text-sm text-red-700"
+              className="p-3.5 bg-destructive/10 border border-destructive/20 rounded-xl text-xs font-semibold text-destructive"
             >
-              {error}
+              {encodeError}
             </div>
           )}
 
           {result && (
-            <div className="p-4 rounded-xl bg-primary/10 border border-primary/30">
-              <div className="flex justify-between items-center mb-2">
-                <span className="text-xs font-bold text-muted-foreground">{t('base64Output')}</span>
-                <div className="flex gap-1">
-                  <CopyButton text={result.rawBase64} tooltip={t('copyRaw')} />
-                  <CopyButton text={result.output} tooltip={t('copyDataUri')} color="info" />
+            <div className="p-4 rounded-2xl bg-card border border-border shadow-sm flex flex-col space-y-3">
+              <div className="flex justify-between items-center select-none">
+                <span className="text-[10px] font-bold uppercase tracking-wider text-muted-foreground/90">
+                  {t('base64Output')}
+                </span>
+                <div className="flex gap-2">
+                  <CopyButton
+                    text={result.rawBase64}
+                    tooltip={t('copyRaw')}
+                    className="h-6 px-2 rounded-md border text-[10px] font-bold"
+                  />
+                  <CopyButton
+                    text={result.output}
+                    tooltip={t('copyDataUri')}
+                    className="h-6 px-2 rounded-md border text-[10px] font-bold"
+                  />
                 </div>
               </div>
               <TextInputArea
@@ -244,70 +160,61 @@ export default function FileMode() {
                     : result.output
                 }
                 showClear={false}
-                showCount
+                minRows={4}
               />
-              <div className="flex items-center gap-4 mt-2">
-                <span className="text-xs text-muted-foreground">
-                  {t('originalSize')}: {formatFileSize(result.originalBytes)}
-                </span>
-                <span className="text-xs text-muted-foreground">
-                  {t('encodedSize')}: {formatFileSize(result.outputBytes)}
-                </span>
-                <div className="flex-1" />
-                <button
-                  type="button"
-                  onClick={handleClear}
-                  className="flex items-center gap-1 px-2 py-1 text-xs text-muted-foreground hover:bg-accent rounded-md transition-colors"
+              <div className="flex items-center justify-between font-mono text-[10px] text-muted-foreground/70 select-none pt-1">
+                <div className="flex gap-4 items-center tabular-nums">
+                  <span>
+                    {t('originalSize')}:{' '}
+                    <span className="font-semibold text-foreground/80">
+                      {formatFileSize(result.originalBytes)}
+                    </span>
+                  </span>
+                  <span className="text-border/60">|</span>
+                  <span>
+                    {t('encodedSize')}:{' '}
+                    <span className="font-semibold text-foreground/80">
+                      {formatFileSize(result.outputBytes)}
+                    </span>
+                  </span>
+                </div>
+                <Button
+                  variant="ghost"
+                  size="sm"
+                  onClick={resetAll}
+                  className="h-7 rounded-md text-muted-foreground hover:text-destructive text-[11px] gap-1 px-2"
                 >
-                  <Trash2 className="w-3 h-3" />
+                  <Trash2 className="w-3.5 h-3.5" />
                   {t('clear')}
-                </button>
+                </Button>
               </div>
             </div>
           )}
-
-          {info && !result && (
-            <button
-              type="button"
-              onClick={handleClear}
-              className="flex items-center gap-1 px-3 py-2 text-sm text-muted-foreground hover:bg-accent rounded-lg transition-colors"
-            >
-              <Trash2 className="w-4 h-4" />
-              {t('clear')}
-            </button>
-          )}
-        </>
-      )}
-
-      {direction === 'decode' && (
-        <>
+        </div>
+      ) : (
+        <div className="flex flex-col space-y-4">
           <TextInputArea
             placeholder={t('decodeBase64Placeholder')}
             value={decodeInput}
-            onChange={(v) => {
-              setDecodeInput(v);
-              setError(null);
-            }}
-            actions={actions}
-            externalError={error || undefined}
-            onClear={() => {
-              setDecoded(null);
-              setDecodedFileName('');
-            }}
+            onChange={setDecodeInput}
+            externalError={decodeError || undefined}
+            showClear={true}
+            allowCopy={true}
+            minRows={6}
+            onClear={resetAll}
           />
-
           {decoded && (
             <DecodeResultPaper
               title={t('decodedFileOutput')}
               mimeType={decoded.mimeType}
               blobSize={decoded.blob.size}
               fileName={decodedFileName}
-              onFileNameChange={setDecodedFileName}
+              onFileNameChange={setCustomFileName}
               onDownload={handleDownload}
             />
           )}
-        </>
+        </div>
       )}
-    </>
+    </div>
   );
 }
diff --git a/pages/Base64Converter/ImageMode.tsx b/pages/Base64Converter/ImageMode.tsx
index 1f68cef..7c5cd00 100644
--- a/pages/Base64Converter/ImageMode.tsx
+++ b/pages/Base64Converter/ImageMode.tsx
@@ -1,33 +1,15 @@
-import { useCallback, useMemo, useRef, useState } from 'react';
-import { Image, Trash2 } from 'lucide-react';
-import TextInputArea, { type ToolbarAction } from '@/components/TextInputArea';
+import { Image as ImageIcon, Trash2 } from 'lucide-react';
+import TextInputArea from '@/components/TextInputArea';
 import { useTranslation } from 'react-i18next';
 import CopyButton from '@/components/CopyButton';
 import DecodeResultPaper from '@/components/DecodeResultPaper';
-import {
-  fileToBase64,
-  isFileSizeValid,
-  isSupportedImageType,
-  isSupportedImageExtension,
-  formatFileSize,
-  base64ToBlob,
-  downloadBlob,
-  MAX_FILE_SIZE,
-} from '@/utils/base64Converter';
-import type { Base64ToBlobResult, FileToBase64Result } from '@/utils/base64Converter';
+import { Button } from '@/components/ui/button';
+import { downloadBlob, formatFileSize } from '@/utils/base64Converter';
 import { useStorageState } from '@/utils/useStorageState';
 import type { Base64ConvertDirection } from '@/types/storage';
 import SwitchButtonGroup from '@/components/SwitchButtonGroup';
-
-interface FileInfo {
-  name: string;
-  size: number;
-  type: string;
-}
-
-const ERROR_MESSAGE_TO_I18N: Record<string, string> = {
-  'Invalid Base64 string': 'invalidBase64',
-};
+import { useBase64Converter } from './useBase64Converter'; // 💡 引入共享核心
+import { cn } from '@/lib/utils';
 
 const isValidDirection = (val: unknown): val is Base64ConvertDirection =>
   val === 'encode' || val === 'decode';
@@ -40,37 +22,24 @@ export default function ImageMode() {
     isValidDirection,
   );
 
-  // encode state
-  const [result, setResult] = useState<FileToBase64Result | null>(null);
-  const [info, setInfo] = useState<FileInfo | null>(null);
-  const [isLoading, setIsLoading] = useState(false);
-  const [isDragging, setIsDragging] = useState(false);
-  const imageInputRef = useRef<HTMLInputElement>(null);
-  const cancelRef = useRef(false);
-
-  // decode state
-  const [decodeInput, setDecodeInput] = useState('');
-  const [decoded, setDecoded] = useState<Base64ToBlobResult | null>(null);
-  const [decodedFileName, setDecodedFileName] = useState('');
-
-  // shared
-  const [error, setError] = useState<string | null>(null);
-
-  const resetAll = useCallback(() => {
-    cancelRef.current = true;
-    setResult(null);
-    setInfo(null);
-    setIsLoading(false);
-    setDecodeInput('');
-    setDecoded(null);
-    setDecodedFileName('');
-    setError(null);
-    if (imageInputRef.current) imageInputRef.current.value = '';
-  }, []);
-
-  const handleClear = () => {
-    resetAll();
-  };
+  // 消费完全托管的核心 Hook，消灭本地多余状态机
+  const {
+    result,
+    info,
+    isLoading,
+    isDragging,
+    setIsDragging,
+    fileInputRef,
+    encodeError,
+    decodeInput,
+    setDecodeInput,
+    decoded,
+    decodeError,
+    decodedFileName,
+    setCustomFileName,
+    resetAll,
+    safeFileSelect,
+  } = useBase64Converter({ mode: 'image' });
 
   const handleDirectionChange = (next: Base64ConvertDirection) => {
     if (!next || next === direction) return;
@@ -78,239 +47,213 @@ export default function ImageMode() {
     setDirection(next);
   };
 
-  const handleFileSelect = async (file: File) => {
-    cancelRef.current = false;
-    setError(null);
-    setResult(null);
-    setInfo(null);
-
-    if (!isFileSizeValid(file.size)) {
-      setError(t('fileSizeExceeded', { max: `${MAX_FILE_SIZE / 1024 / 1024} MB` }));
-      return;
-    }
-
-    if (!isSupportedImageType(file.type) && !isSupportedImageExtension(file.name)) {
-      setError(t('unsupportedImageType'));
-      return;
-    }
-
-    setInfo({
-      name: file.name,
-      size: file.size,
-      type: file.type || 'application/octet-stream',
-    });
-    setIsLoading(true);
-
-    try {
-      const res = await fileToBase64(file);
-      if (!cancelRef.current) setResult(res);
-    } catch (e) {
-      if (!cancelRef.current) {
-        setError(e instanceof Error ? e.message : t('conversionFailed'));
-      }
-    } finally {
-      if (!cancelRef.current) setIsLoading(false);
-    }
-  };
-
-  const handleDragOver = (e: React.DragEvent) => {
-    e.preventDefault();
-    e.stopPropagation();
-    setIsDragging(true);
-  };
-
-  const handleDragLeave = (e: React.DragEvent) => {
-    e.preventDefault();
-    e.stopPropagation();
-    setIsDragging(false);
-  };
-
-  const handleDrop = (e: React.DragEvent) => {
-    e.preventDefault();
-    e.stopPropagation();
-    setIsDragging(false);
-    const file = e.dataTransfer.files[0];
-    if (file) handleFileSelect(file);
-  };
-
   const handleDownload = () => {
-    if (!decoded) return;
-    downloadBlob(decoded.blob, decodedFileName || `decoded${decoded.suggestedExtension}`);
+    if (decoded) downloadBlob(decoded.blob, decodedFileName);
   };
 
-  const actions: ToolbarAction[] = useMemo(
-    () => [
-      {
-        key: 'decode',
-        label: t('decode'),
-        type: 'primary',
-        position: 'bottom',
-        disabled: (value: string) => !value.trim(),
-        onClick: (value: string, helpers) => {
-          helpers.setError('');
-          setDecoded(null);
-          try {
-            const res = base64ToBlob(value);
-            setDecoded(res);
-            setDecodedFileName(`decoded${res.suggestedExtension}`);
-          } catch (e) {
-            const message = e instanceof Error ? e.message : '';
-            const i18nKey = ERROR_MESSAGE_TO_I18N[message];
-            helpers.setError(i18nKey ? t(i18nKey) : message || t('conversionFailed'));
-          }
-        },
-      },
-    ],
-    [t],
-  );
-
   return (
-    <>
-      <SwitchButtonGroup
-        value={direction}
-        options={[
-          { value: 'encode', label: t('encode') },
-          { value: 'decode', label: t('decode') },
-        ]}
-        onChange={handleDirectionChange}
-        size="small"
-      />
+    <div className="w-full flex flex-col space-y-4 animate-in fade-in duration-300">
+      <div className="flex h-11 items-center px-1.5 bg-secondary/40 rounded-xl border border-border/60 w-fit">
+        <SwitchButtonGroup
+          value={direction}
+          options={[
+            { value: 'encode', label: t('encode') },
+            { value: 'decode', label: t('decode') },
+          ]}
+          onChange={handleDirectionChange}
+          size="small"
+        />
+      </div>
 
-      {direction === 'encode' && (
-        <>
+      {direction === 'encode' ? (
+        <div className="flex flex-col space-y-4">
+          {/* 图片拖拽投递箱终端 */}
           <div
-            onDragOver={handleDragOver}
-            onDragLeave={handleDragLeave}
-            onDrop={handleDrop}
-            onClick={() => imageInputRef.current?.click()}
-            className={`flex flex-col items-center justify-center min-h-[180px] border-2 border-dashed rounded-xl p-8 cursor-pointer transition-all duration-200 ${
+            onDragOver={(e) => {
+              e.preventDefault();
+              setIsDragging(true);
+            }}
+            onDragLeave={() => setIsDragging(false)}
+            onDrop={(e) => {
+              e.preventDefault();
+              setIsDragging(false);
+              const file = e.dataTransfer.files[0];
+              if (file) safeFileSelect(file);
+            }}
+            onClick={() => fileInputRef.current?.click()}
+            className={cn(
+              'flex flex-col items-center justify-center min-h-[190px] border-2 border-dashed rounded-2xl p-8 cursor-pointer transition-all duration-300',
               isDragging
                 ? 'border-primary bg-primary/10'
                 : info
-                  ? 'border-primary bg-primary/5'
-                  : 'border-input bg-muted hover:border-primary hover:bg-primary/5'
-            }`}
+                  ? 'border-primary/60 bg-primary/5'
+                  : 'border-border bg-muted/40 hover:border-primary/80 hover:bg-muted/70',
+            )}
           >
             <input
-              ref={imageInputRef}
+              ref={fileInputRef}
               type="file"
               accept="image/*"
               hidden
               onChange={(e) => {
                 const file = e.target.files?.[0];
-                if (file) handleFileSelect(file);
+                if (file) safeFileSelect(file);
               }}
             />
             {isLoading ? (
-              <div className="w-10 h-10 border-4 border-primary/30 border-t-primary rounded-full animate-spin" />
+              <div className="w-9 h-9 border-3 border-primary/20 border-t-primary rounded-full animate-spin" />
             ) : info ? (
-              <div className="flex flex-col items-center gap-1">
+              <div className="flex flex-col items-center gap-1.5 text-center animate-in fade-in duration-200 w-full">
                 {result && (
-                  <img
-                    src={result.output}
-                    alt="preview"
-                    className="max-w-full max-h-40 rounded-lg object-contain mb-2"
-                  />
+                  <div className="relative p-1 border border-border bg-background rounded-lg shadow-sm mb-1 max-w-[180px] overflow-hidden">
+                    <img
+                      src={result.output}
+                      alt="preview"
+                      className="max-h-32 w-full object-contain rounded"
+                    />
+                  </div>
                 )}
-                <span className="text-sm font-bold">{info.name}</span>
-                <span className="text-xs text-muted-foreground">
+                <span className="text-sm font-bold text-foreground/90 max-w-[280px] truncate">
+                  {info.name}
+                </span>
+                <span className="text-xs text-muted-foreground/80 font-mono tabular-nums">
                   {formatFileSize(info.size)} · {info.type}
                 </span>
-                <span className="text-xs text-muted-foreground">{t('clickOrDropToReplace')}</span>
+                <span className="text-[11px] font-medium text-primary/80 mt-1">
+                  {t('clickOrDropToReplace')}
+                </span>
               </div>
             ) : (
-              <div className="flex flex-col items-center gap-1">
-                <Image className="w-10 h-10 text-muted-foreground" />
-                <span className="text-sm text-muted-foreground font-semibold">
+              <div className="flex flex-col items-center gap-1.5 text-center">
+                <ImageIcon className="w-8 h-8 text-muted-foreground/60" />
+                <span className="text-xs font-bold text-foreground/80">
                   {t('clickOrDropToImage')}
                 </span>
-                <span className="text-xs text-muted-foreground">{t('supportedFormats')}</span>
+                <span className="text-[10px] font-medium text-muted-foreground/60">
+                  {t('supportedFormats')}
+                </span>
               </div>
             )}
           </div>
 
-          {error && (
+          {encodeError && (
             <div
               role="alert"
-              className="p-3 rounded-lg bg-red-50 border border-red-200 text-sm text-red-700"
+              className="p-3.5 bg-destructive/10 border border-destructive/20 rounded-xl text-xs font-semibold text-destructive tracking-wide"
             >
-              {error}
+              {encodeError}
             </div>
           )}
 
           {result && (
-            <div className="p-4 rounded-xl bg-primary/10 border border-primary/30">
-              <div className="flex justify-between items-center mb-2">
-                <span className="text-xs font-bold text-muted-foreground">{t('base64Output')}</span>
-                <div className="flex gap-1">
-                  <CopyButton text={result.rawBase64} tooltip={t('copyRaw')} />
-                  <CopyButton text={result.output} tooltip={t('copyDataUri')} color="info" />
+            <div className="p-4 rounded-2xl bg-card border border-border shadow-sm flex flex-col space-y-3">
+              <div className="flex justify-between items-center select-none">
+                <span className="text-[10px] font-bold uppercase tracking-wider text-muted-foreground/90">
+                  {t('base64Output')}
+                </span>
+                <div className="flex gap-2">
+                  <CopyButton
+                    text={result.rawBase64}
+                    tooltip={t('copyRaw')}
+                    className="h-6 px-2 rounded-md border text-[10px] font-bold"
+                  />
+                  <CopyButton
+                    text={result.output}
+                    tooltip={t('copyDataUri')}
+                    className="h-6 px-2 rounded-md border text-[10px] font-bold"
+                  />
                 </div>
               </div>
-              <div className="font-mono text-xs break-all max-h-[200px] overflow-y-auto leading-relaxed text-primary font-semibold">
-                {result.output.length > 2000
-                  ? `${result.output.substring(0, 2000)}...`
-                  : result.output}
-              </div>
-              <div className="flex gap-4 mt-2">
-                <span className="text-xs text-muted-foreground">
-                  {t('originalSize')}: {formatFileSize(result.originalBytes)}
-                </span>
-                <span className="text-xs text-muted-foreground">
-                  {t('encodedSize')}: {formatFileSize(result.outputBytes)}
-                </span>
+
+              <TextInputArea
+                readOnly
+                value={
+                  result.output.length > 2000
+                    ? `${result.output.substring(0, 2000)}...`
+                    : result.output
+                }
+                showClear={false}
+                minRows={4}
+              />
+
+              <div className="flex items-center justify-between font-mono text-[10px] text-muted-foreground/70 select-none pt-1">
+                <div className="flex gap-4 items-center tabular-nums">
+                  <span>
+                    {t('originalSize')}:{' '}
+                    <span className="font-semibold text-foreground/80">
+                      {formatFileSize(result.originalBytes)}
+                    </span>
+                  </span>
+                  <span className="text-border/60">|</span>
+                  <span>
+                    {t('encodedSize')}:{' '}
+                    <span className="font-semibold text-foreground/80">
+                      {formatFileSize(result.outputBytes)}
+                    </span>
+                  </span>
+                </div>
+
+                <Button
+                  variant="ghost"
+                  size="sm"
+                  onClick={resetAll}
+                  className="h-7 rounded-md text-muted-foreground hover:text-destructive text-[11px] gap-1 px-2"
+                >
+                  <Trash2 className="w-3.5 h-3.5" />
+                  {t('clear')}
+                </Button>
               </div>
             </div>
           )}
 
-          {info && (
-            <button
-              type="button"
-              onClick={handleClear}
-              className="flex items-center gap-1 px-3 py-2 text-sm text-muted-foreground hover:bg-accent rounded-lg transition-colors"
-            >
-              <Trash2 className="w-4 h-4" />
-              {t('clear')}
-            </button>
+          {info && !result && (
+            <div className="flex justify-end select-none">
+              <Button
+                variant="outline"
+                size="sm"
+                onClick={resetAll}
+                className="h-8 rounded-md text-xs gap-1.5 text-destructive hover:text-destructive hover:bg-destructive/5 dark:hover:bg-destructive/10"
+              >
+                <Trash2 className="w-3.5 h-3.5" />
+                {t('clear')}
+              </Button>
+            </div>
           )}
-        </>
-      )}
-
-      {direction === 'decode' && (
-        <>
+        </div>
+      ) : (
+        <div className="flex flex-col space-y-4">
           <TextInputArea
             placeholder={t('decodeBase64Placeholder')}
             value={decodeInput}
-            onChange={(v) => {
-              setDecodeInput(v);
-              setError(null);
-            }}
-            actions={actions}
-            externalError={error || undefined}
-            onClear={() => {
-              setDecoded(null);
-              setDecodedFileName('');
-            }}
+            onChange={setDecodeInput}
+            externalError={decodeError || undefined}
+            showClear={true}
+            allowCopy={true}
+            minRows={6}
+            onClear={resetAll}
           />
-
           {decoded && (
-            <DecodeResultPaper
-              title={t('decodedImageOutput')}
-              mimeType={decoded.mimeType}
-              blobSize={decoded.blob.size}
-              fileName={decodedFileName}
-              onFileNameChange={setDecodedFileName}
-              onDownload={handleDownload}
-            >
-              <img
-                src={`data:${decoded.mimeType};base64,${decoded.rawBase64}`}
-                alt="decoded preview"
-                className="max-w-full max-h-40 rounded-lg object-contain mb-3"
-              />
-            </DecodeResultPaper>
+            <div className="animate-in slide-in-from-bottom-2 duration-300">
+              <DecodeResultPaper
+                title={t('decodedImageOutput')}
+                mimeType={decoded.mimeType}
+                blobSize={decoded.blob.size}
+                fileName={decodedFileName}
+                onFileNameChange={setCustomFileName}
+                onDownload={handleDownload}
+              >
+                <div className="relative p-1.5 border border-border bg-background dark:bg-muted/10 rounded-xl max-w-[220px] mb-3 overflow-hidden shadow-sm">
+                  <img
+                    src={`data:${decoded.mimeType};base64,${decoded.rawBase64}`}
+                    alt="decoded preview"
+                    className="max-h-40 w-full rounded-lg object-contain bg-[linear-gradient(45deg,#ccc_25%,transparent_25%),linear-gradient(-45deg,#ccc_25%,transparent_25%),linear-gradient(45deg,transparent_75%,#ccc_75%),linear-gradient(-45deg,transparent_75%,#ccc_75%)] bg-[size:10px_10px] bg-[position:0_0,0_5px,5px_-5px,-5px_0] dark:bg-none"
+                  />
+                </div>
+              </DecodeResultPaper>
+            </div>
           )}
-        </>
+        </div>
       )}
-    </>
+    </div>
   );
 }
diff --git a/pages/Base64Converter/TextMode.tsx b/pages/Base64Converter/TextMode.tsx
index 4b3db19..c78960d 100644
--- a/pages/Base64Converter/TextMode.tsx
+++ b/pages/Base64Converter/TextMode.tsx
@@ -1,11 +1,11 @@
-import { useCallback, useMemo, useState } from 'react';
-import { ArrowLeftRight } from 'lucide-react';
-import TextInputArea, { type ToolbarAction } from '@/components/TextInputArea';
+import { useCallback, useEffect, useMemo, useState } from 'react';
+import TextInputArea from '@/components/TextInputArea';
 import { useTranslation } from 'react-i18next';
 import CopyButton from '@/components/CopyButton';
-import { textToBase64, base64ToText } from '@/utils/base64Converter';
+import { base64ToText, textToBase64 } from '@/utils/base64Converter';
 import SwitchButtonGroup from '@/components/SwitchButtonGroup';
 import { useContextMenuData } from '@/utils/useContextMenuData';
+import { Button } from '@/components/ui/button';
 
 const IMAGE_DATA_URI_PATTERN = /^\s*data:image\//i;
 
@@ -21,31 +21,56 @@ interface TextModeProps {
 
 export default function TextMode({ onSwitchToImageMode }: TextModeProps = {}) {
   const { t } = useTranslation('base64Converter');
+
+  // 1. 纯净的核心源状态机：只保留输入源和转换方向
   const [input, setInput] = useState('');
-  const [output, setOutput] = useState('');
-  const [error, setError] = useState<string | null>(null);
+  const [debouncedInput, setDebouncedInput] = useState('');
   const [direction, setDirection] = useState<'encode' | 'decode'>('encode');
 
-  const handleContextMenuData = useCallback(
-    (payload: string) => {
-      setInput(payload);
-      setDirection('decode');
-      setError(null);
-      try {
-        const decoded = base64ToText(payload);
-        setOutput(decoded);
-      } catch (e) {
-        const message = e instanceof Error ? e.message : '';
-        const i18nKey = ERROR_MESSAGE_TO_I18N[message];
-        setError(i18nKey ? t(i18nKey) : message || t('conversionFailed'));
-      }
-    },
-    [t],
-  );
+  // 2. 文本高频敲击防抖大闸：斩断频繁进行文本转 Base64 带来的 CPU 计算过热
+  useEffect(() => {
+    const handle = setTimeout(() => {
+      setDebouncedInput(input);
+    }, 200);
+    return () => clearTimeout(handle);
+  }, [input]);
+
+  // 3. 右键联动数据上下文：优雅原地合并受控状态
+  const handleContextMenuData = useCallback((payload: string) => {
+    setInput(payload);
+    setDebouncedInput(payload);
+    setDirection('decode');
+  }, []);
 
   useContextMenuData({ featureKey: 'base64Converter', onData: handleContextMenuData });
 
-  const actionLabel = direction === 'encode' ? t('encode') : t('decode');
+  // 💡 4. 贯彻方案 A（彻底消灭 setOutput / setError）：
+  // 让所有的转化逻辑、类型安全校验在 useMemo 内存管道中单次渲染一气呵成！
+  const conversionPipeline = useMemo(() => {
+    const trimmed = debouncedInput.trim();
+    if (!trimmed) return { output: '', error: null };
+
+    try {
+      if (direction === 'encode') {
+        const result = textToBase64(debouncedInput);
+        return { output: result.output, error: null };
+      } else {
+        const decoded = base64ToText(trimmed);
+        return { output: decoded, error: null };
+      }
+    } catch (e) {
+      const message = e instanceof Error ? e.message : '';
+      const i18nKey = ERROR_MESSAGE_TO_I18N[message];
+      return {
+        output: '',
+        error: i18nKey ? t(i18nKey) : message || t('conversionFailed'),
+      };
+    }
+  }, [debouncedInput, direction, t]);
+
+  const output = conversionPipeline.output;
+  const error = conversionPipeline.error;
+
   const placeholder =
     direction === 'encode' ? t('textInputPlaceholder') : t('base64InputPlaceholder');
   const outputLabel = direction === 'encode' ? t('base64Output') : t('textOutput');
@@ -55,97 +80,88 @@ export default function TextMode({ onSwitchToImageMode }: TextModeProps = {}) {
     [direction, input],
   );
 
-  const handleDirectionChange = useCallback(
-    (value: 'encode' | 'decode') => {
-      if (value === direction) return;
-      setDirection(value);
-      setOutput('');
-      setError(null);
-    },
-    [direction],
-  );
+  const handleDirectionChange = (value: 'encode' | 'decode') => {
+    if (value === direction) return;
+    setDirection(value);
+    setInput('');
+    setDebouncedInput('');
+  };
 
-  const actions: ToolbarAction[] = useMemo(
-    () => [
-      {
-        key: 'convert',
-        label: actionLabel,
-        icon: <ArrowLeftRight />,
-        type: 'primary',
-        position: 'bottom',
-        disabled: (value: string) => !value.trim(),
-        onClick: (value: string) => {
-          setError(null);
-          try {
-            if (direction === 'encode') {
-              const result = textToBase64(value);
-              setOutput(result.output);
-            } else {
-              const decoded = base64ToText(value);
-              setOutput(decoded);
-            }
-          } catch (e) {
-            const message = e instanceof Error ? e.message : '';
-            const i18nKey = ERROR_MESSAGE_TO_I18N[message];
-            setError(i18nKey ? t(i18nKey) : message || t('conversionFailed'));
-          }
-        },
-      },
-    ],
-    [direction, t, actionLabel],
-  );
+  const handleClear = () => {
+    setInput('');
+    setDebouncedInput('');
+  };
 
   return (
-    <>
-      <SwitchButtonGroup
-        value={direction}
-        options={[
-          { value: 'encode', label: t('encode') },
-          { value: 'decode', label: t('decode') },
-        ]}
-        onChange={handleDirectionChange}
-        size="small"
-      />
+    <div className="w-full flex flex-col space-y-4 animate-in fade-in duration-300">
+      {/* 受控方向切流中枢 */}
+      <div className="flex h-11 items-center px-1.5 bg-secondary/40 rounded-xl border border-border/60 w-fit">
+        <SwitchButtonGroup
+          value={direction}
+          options={[
+            { value: 'encode', label: t('encode') },
+            { value: 'decode', label: t('decode') },
+          ]}
+          onChange={handleDirectionChange}
+          size="small"
+        />
+      </div>
 
+      {/* 高性能受控文本输入端 */}
       <TextInputArea
         placeholder={placeholder}
         value={input}
-        onChange={(v) => {
-          setInput(v);
-          setError(null);
-        }}
-        actions={actions}
-        externalError={error || undefined}
-        onClear={() => setOutput('')}
+        onChange={setInput}
+        externalError={error || undefined} // 💡 流式异常大闸动态注入
+        showClear={true}
+        allowCopy={true}
+        minRows={5}
+        maxRows={10}
+        onClear={handleClear}
       />
 
+      {/* 图片 URI 类型劫持警告引导区：
+        - 💡 修复点：彻底废除原生亮色硬编码 hover:bg-blue-100 类名，
+        - 完美向全站 shadcn 暗黑生态看齐，采用标准的 bg-primary/10 混合变体。
+      */}
       {showImageHint && (
-        <div className="flex items-center justify-between p-3 rounded-lg bg-primary/10 border border-primary/30">
-          <span className="text-sm text-primary">{t('imageDataUriHint')}</span>
-          <button
+        <div className="flex items-center justify-between p-3.5 rounded-xl bg-primary/10 border border-primary/20 animate-in slide-in-from-top-1 duration-200">
+          <span className="text-xs font-semibold text-primary tracking-tight">
+            {t('imageDataUriHint')}
+          </span>
+          <Button
             type="button"
+            variant="ghost"
+            size="sm"
             onClick={onSwitchToImageMode}
-            className="px-3 py-1 text-sm font-medium text-primary hover:bg-blue-100 rounded-md transition-colors"
+            className="h-7 rounded-md text-xs font-bold text-primary hover:text-primary hover:bg-primary/20 dark:hover:bg-primary/10 transition-colors px-2.5"
           >
             {t('switchToImageMode')}
-          </button>
+          </Button>
         </div>
       )}
 
+      {/* 5. 编码/解码核心数据承载流卡片 */}
       {output && (
-        <div className="p-4 rounded-xl bg-primary/10 border border-primary/30">
-          <div className="flex justify-between items-center mb-2">
-            <span className="text-xs font-bold text-muted-foreground">{outputLabel}</span>
-            <CopyButton text={output} />
+        <div className="p-4 rounded-2xl bg-card border border-border shadow-sm flex flex-col space-y-3 animate-in slide-in-from-bottom-2 duration-300">
+          <div className="flex justify-between items-center select-none">
+            <span className="text-[10px] font-bold uppercase tracking-wider text-muted-foreground/90">
+              {outputLabel}
+            </span>
+            <CopyButton
+              text={output}
+              className="h-6 px-2 rounded-md border text-[10px] font-bold"
+            />
           </div>
+
           <TextInputArea
             readOnly
             value={output.length > 2000 ? `${output.substring(0, 2000)}...` : output}
             showClear={false}
-            showCount
+            minRows={4}
           />
         </div>
       )}
-    </>
+    </div>
   );
 }
diff --git a/pages/Base64Converter/__tests__/FileMode.test.tsx b/pages/Base64Converter/__tests__/FileMode.test.tsx
index 09cd890..3e9f91a 100644
--- a/pages/Base64Converter/__tests__/FileMode.test.tsx
+++ b/pages/Base64Converter/__tests__/FileMode.test.tsx
@@ -1,5 +1,5 @@
-import { describe, it, expect, vi, beforeEach } from 'vitest';
-import { render, screen, fireEvent, waitFor, act } from '@testing-library/react';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { act, fireEvent, render, screen, waitFor } from '@testing-library/react';
 import FileMode from '../FileMode';
 
 // Mock CopyButton
@@ -13,6 +13,11 @@ vi.mock('@/components/CopyButton', () => ({
 
 beforeEach(() => {
   localStorage.clear();
+  vi.useFakeTimers({ shouldAdvanceTime: true });
+});
+
+afterEach(() => {
+  vi.useRealTimers();
 });
 
 // useStorageState's async loadState may overwrite user toggle if we click before the
@@ -124,7 +129,7 @@ describe('FileMode', () => {
 
   it('应该渲染 encode/decode 切换按钮', () => {
     render(<FileMode />);
-    expect(screen.getAllByText('encode').length).toBeGreaterThanOrEqual(1);
+    expect(screen.getByText('encode')).toBeInTheDocument();
     expect(screen.getByText('decode')).toBeInTheDocument();
   });
 
@@ -143,7 +148,9 @@ describe('FileMode', () => {
     const input = await screen.findByPlaceholderText('decodeBase64Placeholder');
     fireEvent.change(input, { target: { value: 'JVBERi0K' } });
 
-    fireEvent.click(screen.getAllByText('decode')[1]);
+    act(() => {
+      vi.advanceTimersByTime(250);
+    });
 
     await waitFor(() => {
       expect(screen.getByText('decodedFileOutput')).toBeInTheDocument();
@@ -159,7 +166,10 @@ describe('FileMode', () => {
 
     const input = await screen.findByPlaceholderText('decodeBase64Placeholder');
     fireEvent.change(input, { target: { value: 'JVBERi0K' } });
-    fireEvent.click(screen.getAllByText('decode')[1]);
+
+    act(() => {
+      vi.advanceTimersByTime(250);
+    });
 
     const filenameInput = (await screen.findByDisplayValue('decoded.pdf')) as HTMLInputElement;
     fireEvent.change(filenameInput, { target: { value: 'my-report.pdf' } });
@@ -173,7 +183,10 @@ describe('FileMode', () => {
 
     const input = await screen.findByPlaceholderText('decodeBase64Placeholder');
     fireEvent.change(input, { target: { value: 'JVBERi0K' } });
-    fireEvent.click(screen.getAllByText('decode')[1]);
+
+    act(() => {
+      vi.advanceTimersByTime(250);
+    });
 
     expect(await screen.findByText('download')).toBeInTheDocument();
   });
@@ -185,7 +198,10 @@ describe('FileMode', () => {
 
     const input = await screen.findByPlaceholderText('decodeBase64Placeholder');
     fireEvent.change(input, { target: { value: '!!!not base64' } });
-    fireEvent.click(screen.getAllByText('decode')[1]);
+
+    act(() => {
+      vi.advanceTimersByTime(250);
+    });
 
     await waitFor(() => {
       expect(screen.getByText('invalidBase64')).toBeInTheDocument();
@@ -199,13 +215,16 @@ describe('FileMode', () => {
 
     const input = await screen.findByPlaceholderText('decodeBase64Placeholder');
     fireEvent.change(input, { target: { value: 'JVBERi0K' } });
-    fireEvent.click(screen.getAllByText('decode')[1]);
+
+    act(() => {
+      vi.advanceTimersByTime(250);
+    });
 
     await waitFor(() => {
       expect(screen.getByText('decodedFileOutput')).toBeInTheDocument();
     });
 
-    fireEvent.click(screen.getAllByText('encode')[0]);
+    fireEvent.click(screen.getByText('encode'));
 
     await waitFor(() => {
       expect(screen.queryByText('decodedFileOutput')).not.toBeInTheDocument();
diff --git a/pages/Base64Converter/__tests__/ImageMode.test.tsx b/pages/Base64Converter/__tests__/ImageMode.test.tsx
index bcc163a..e8ccfc7 100644
--- a/pages/Base64Converter/__tests__/ImageMode.test.tsx
+++ b/pages/Base64Converter/__tests__/ImageMode.test.tsx
@@ -1,5 +1,5 @@
-import { describe, it, expect, vi, beforeEach } from 'vitest';
-import { render, screen, fireEvent, waitFor, act } from '@testing-library/react';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { act, fireEvent, render, screen, waitFor } from '@testing-library/react';
 import ImageMode from '../ImageMode';
 
 // Mock CopyButton
@@ -13,6 +13,11 @@ vi.mock('@/components/CopyButton', () => ({
 
 beforeEach(() => {
   localStorage.clear();
+  vi.useFakeTimers({ shouldAdvanceTime: true });
+});
+
+afterEach(() => {
+  vi.useRealTimers();
 });
 
 const waitForStorageReady = () => act(() => Promise.resolve());
@@ -119,7 +124,7 @@ describe('ImageMode', () => {
   it('应该渲染 encode/decode 切换按钮', async () => {
     render(<ImageMode />);
     await waitForStorageReady();
-    expect(screen.getAllByText('encode').length).toBeGreaterThanOrEqual(1);
+    expect(screen.getByText('encode')).toBeInTheDocument();
     expect(screen.getByText('decode')).toBeInTheDocument();
   });
 
@@ -130,7 +135,10 @@ describe('ImageMode', () => {
 
     const input = await screen.findByPlaceholderText('decodeBase64Placeholder');
     fireEvent.change(input, { target: { value: 'iVBORw0KGgo=' } });
-    fireEvent.click(screen.getAllByText('decode')[1]);
+
+    act(() => {
+      vi.advanceTimersByTime(250);
+    });
 
     await waitFor(() => {
       expect(screen.getByText('decodedImageOutput')).toBeInTheDocument();
@@ -147,7 +155,10 @@ describe('ImageMode', () => {
 
     const input = await screen.findByPlaceholderText('decodeBase64Placeholder');
     fireEvent.change(input, { target: { value: 'iVBORw0KGgo=' } });
-    fireEvent.click(screen.getAllByText('decode')[1]);
+
+    act(() => {
+      vi.advanceTimersByTime(250);
+    });
 
     expect(await screen.findByDisplayValue('decoded.png')).toBeInTheDocument();
   });
@@ -159,7 +170,10 @@ describe('ImageMode', () => {
 
     const input = await screen.findByPlaceholderText('decodeBase64Placeholder');
     fireEvent.change(input, { target: { value: '!!!not base64' } });
-    fireEvent.click(screen.getAllByText('decode')[1]);
+
+    act(() => {
+      vi.advanceTimersByTime(250);
+    });
 
     await waitFor(() => {
       expect(screen.getByText('invalidBase64')).toBeInTheDocument();
diff --git a/pages/Base64Converter/__tests__/TextMode.test.tsx b/pages/Base64Converter/__tests__/TextMode.test.tsx
index 573001d..cae191a 100644
--- a/pages/Base64Converter/__tests__/TextMode.test.tsx
+++ b/pages/Base64Converter/__tests__/TextMode.test.tsx
@@ -1,5 +1,5 @@
-import { describe, it, expect, vi } from 'vitest';
-import { render, screen, fireEvent, waitFor, act } from '@testing-library/react';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { act, fireEvent, render, screen, waitFor } from '@testing-library/react';
 import TextMode from '../TextMode';
 
 // Mock CopyButton
@@ -8,9 +8,17 @@ vi.mock('@/components/CopyButton', () => ({
 }));
 
 describe('TextMode', () => {
+  beforeEach(() => {
+    vi.useFakeTimers({ shouldAdvanceTime: true });
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
   it('应该渲染编码/解码切换按钮', () => {
     render(<TextMode />);
-    expect(screen.getAllByText('encode').length).toBeGreaterThanOrEqual(1);
+    expect(screen.getByText('encode')).toBeInTheDocument();
     expect(screen.getByText('decode')).toBeInTheDocument();
   });
 
@@ -24,13 +32,13 @@ describe('TextMode', () => {
     const input = screen.getByPlaceholderText('textInputPlaceholder');
     fireEvent.change(input, { target: { value: 'Hello' } });
 
-    const convertBtn = screen.getAllByText('encode')[1];
-    fireEvent.click(convertBtn);
+    act(() => {
+      vi.advanceTimersByTime(200);
+    });
 
     await waitFor(() => {
       expect(screen.getByText('base64Output')).toBeInTheDocument();
     });
-    // 输出内容在 CopyButton 的 data-testid 中
     expect(screen.getByTestId('copy-button')).toHaveTextContent('SGVsbG8=');
   });
 
@@ -43,8 +51,9 @@ describe('TextMode', () => {
     const input = screen.getByPlaceholderText('base64InputPlaceholder');
     fireEvent.change(input, { target: { value: 'SGVsbG8=' } });
 
-    const convertBtn = screen.getAllByText('decode')[1];
-    fireEvent.click(convertBtn);
+    act(() => {
+      vi.advanceTimersByTime(200);
+    });
 
     await waitFor(() => {
       expect(screen.getByText('textOutput')).toBeInTheDocument();
@@ -61,8 +70,9 @@ describe('TextMode', () => {
     const input = screen.getByPlaceholderText('base64InputPlaceholder');
     fireEvent.change(input, { target: { value: 'invalid!!!' } });
 
-    const convertBtn = screen.getAllByText('decode')[1];
-    fireEvent.click(convertBtn);
+    act(() => {
+      vi.advanceTimersByTime(200);
+    });
 
     await waitFor(() => {
       expect(screen.getByText('invalidBase64')).toBeInTheDocument();
@@ -75,16 +85,17 @@ describe('TextMode', () => {
     // 先编码
     const input = screen.getByPlaceholderText('textInputPlaceholder');
     fireEvent.change(input, { target: { value: 'Hello' } });
-    fireEvent.click(screen.getAllByText('encode')[1]);
+
+    act(() => {
+      vi.advanceTimersByTime(200);
+    });
 
     await waitFor(() => {
       expect(screen.getByTestId('copy-button')).toHaveTextContent('SGVsbG8=');
     });
 
     // 切换方向
-    await act(async () => {
-      fireEvent.click(screen.getByText('decode'));
-    });
+    fireEvent.click(screen.getByText('decode'));
 
     // 输出应该被清除
     await waitFor(() => {
@@ -97,7 +108,10 @@ describe('TextMode', () => {
 
     const input = screen.getByPlaceholderText('textInputPlaceholder');
     fireEvent.change(input, { target: { value: 'Hello' } });
-    fireEvent.click(screen.getAllByText('encode')[1]);
+
+    act(() => {
+      vi.advanceTimersByTime(200);
+    });
 
     await waitFor(() => {
       expect(screen.getByTestId('copy-button')).toHaveTextContent('SGVsbG8=');
@@ -111,20 +125,6 @@ describe('TextMode', () => {
     });
   });
 
-  it('空输入时转换按钮应该禁用', () => {
-    render(<TextMode />);
-    const convertBtn = screen.getAllByText('encode')[1];
-    expect(convertBtn).toBeDisabled();
-  });
-
-  it('输入非空时转换按钮应该启用', () => {
-    render(<TextMode />);
-    const input = screen.getByPlaceholderText('textInputPlaceholder');
-    fireEvent.change(input, { target: { value: 'Hello' } });
-    const convertBtn = screen.getAllByText('encode')[1];
-    expect(convertBtn).not.toBeDisabled();
-  });
-
   it('解码模式下粘贴图片 data URI 时应该显示切换图像模式的提示', () => {
     render(<TextMode />);
 
@@ -172,8 +172,9 @@ describe('TextMode', () => {
     const input = screen.getByPlaceholderText('base64InputPlaceholder');
     fireEvent.change(input, { target: { value: 'iVBORw0KGgo=' } });
 
-    const convertBtn = screen.getAllByText('decode')[1];
-    fireEvent.click(convertBtn);
+    act(() => {
+      vi.advanceTimersByTime(200);
+    });
 
     await waitFor(() => {
       expect(screen.getByText('binaryDataDetected')).toBeInTheDocument();
diff --git a/pages/Base64Converter/__tests__/index.test.tsx b/pages/Base64Converter/__tests__/index.test.tsx
index c099382..41395c2 100644
--- a/pages/Base64Converter/__tests__/index.test.tsx
+++ b/pages/Base64Converter/__tests__/index.test.tsx
@@ -1,5 +1,5 @@
-import { describe, it, expect, vi } from 'vitest';
-import { render, screen, fireEvent } from '@testing-library/react';
+import { describe, expect, it, vi } from 'vitest';
+import { act, fireEvent, render, screen, waitFor } from '@testing-library/react';
 import Base64ConverterPage from '../index';
 
 // Mock useLazyTranslation
@@ -22,46 +22,61 @@ vi.mock('@/config/features', async (importOriginal) => {
 
 // Mock 子组件
 vi.mock('../TextMode', () => ({
-  default: () => <div data-testid="text-mode">TextMode</div>,
+  default: ({ onSwitchToImageMode }: { onSwitchToImageMode?: () => void }) => (
+    <div data-testid="text-mode">
+      TextMode
+      {onSwitchToImageMode && <button onClick={onSwitchToImageMode}>switchToImage</button>}
+    </div>
+  ),
 }));
 
-vi.mock('../FileMode', () => ({
-  default: () => <div data-testid="file-mode">FileMode</div>,
+vi.mock('../Base64ConverterSection', () => ({
+  default: ({ mode }: { mode: string }) => <div data-testid={`${mode}-mode`}>{mode}</div>,
 }));
 
-vi.mock('../ImageMode', () => ({
-  default: () => <div data-testid="image-mode">ImageMode</div>,
-}));
+const waitForStorageInit = () =>
+  act(async () => {
+    await Promise.resolve();
+  });
 
 describe('Base64ConverterPage', () => {
-  it('应该默认渲染文本模式', () => {
+  it('应该默认渲染文本模式', async () => {
     render(<Base64ConverterPage />);
+    await waitForStorageInit();
     expect(screen.getByTestId('text-mode')).toBeInTheDocument();
   });
 
-  it('应该渲染模式切换按钮', () => {
+  it('应该渲染模式切换按钮', async () => {
     render(<Base64ConverterPage />);
+    await waitForStorageInit();
     expect(screen.getByText('base64Converter:textMode')).toBeInTheDocument();
     expect(screen.getByText('base64Converter:fileMode')).toBeInTheDocument();
     expect(screen.getByText('base64Converter:imageMode')).toBeInTheDocument();
   });
 
-  it('切换到文件模式应该渲染 FileMode', () => {
+  it('切换到文件模式应该渲染 FileMode', async () => {
     render(<Base64ConverterPage />);
+    await waitForStorageInit();
     fireEvent.click(screen.getByText('base64Converter:fileMode'));
-    expect(screen.getByTestId('file-mode')).toBeInTheDocument();
+    await waitFor(() => {
+      expect(screen.getByTestId('file-mode')).toBeInTheDocument();
+    });
     expect(screen.queryByTestId('text-mode')).not.toBeInTheDocument();
   });
 
-  it('切换到图像模式应该渲染 ImageMode', () => {
+  it('切换到图像模式应该渲染 ImageMode', async () => {
     render(<Base64ConverterPage />);
+    await waitForStorageInit();
     fireEvent.click(screen.getByText('base64Converter:imageMode'));
-    expect(screen.getByTestId('image-mode')).toBeInTheDocument();
+    await waitFor(() => {
+      expect(screen.getByTestId('image-mode')).toBeInTheDocument();
+    });
     expect(screen.queryByTestId('text-mode')).not.toBeInTheDocument();
   });
 
-  it('应该渲染页面标题', () => {
+  it('应该渲染页面标题', async () => {
     render(<Base64ConverterPage />);
+    await waitForStorageInit();
     expect(screen.getByText('base64Converter:pageTitle')).toBeInTheDocument();
     expect(screen.getByText('base64Converter:pageSubtitle')).toBeInTheDocument();
   });
diff --git a/pages/Base64Converter/index.tsx b/pages/Base64Converter/index.tsx
index 0a943dc..485dd7d 100644
--- a/pages/Base64Converter/index.tsx
+++ b/pages/Base64Converter/index.tsx
@@ -1,16 +1,14 @@
-import { Type, Upload, Image } from 'lucide-react';
+import { Image as ImageIcon, Type, Upload } from 'lucide-react';
 import { useLazyTranslation } from '@/utils/useLazyTranslation';
 import PageHeader from '@/components/PageHeader';
 import { base64ConverterPageStyles } from '@/config/pageTheme';
 import { useStorageState } from '@/utils/useStorageState';
 import type { Base64ConverterPageMode } from '@/types/storage';
 import TextMode from './TextMode';
-import FileMode from './FileMode';
-import ImageMode from './ImageMode';
+import Base64ConverterSection from './Base64ConverterSection'; // ✅ 正确对接全新的一体化大组件
 import SwitchButtonGroup from '@/components/SwitchButtonGroup';
 
 const VALID_PAGE_MODES: readonly Base64ConverterPageMode[] = ['text', 'file', 'image'];
-
 const isValidPageMode = (val: unknown): val is Base64ConverterPageMode =>
   typeof val === 'string' && (VALID_PAGE_MODES as readonly string[]).includes(val);
 
@@ -25,37 +23,37 @@ export default function Index() {
   );
 
   const modeIcon: Record<PageMode, React.ReactNode> = {
-    text: <Type />,
-    file: <Upload />,
-    image: <Image />,
+    text: <Type className="h-4 w-4" />,
+    file: <Upload className="h-4 w-4" />,
+    image: <ImageIcon className="h-4 w-4" />,
   };
 
   return (
-    <div>
-      <div className="p-2">
-        <PageHeader
-          title={t('base64Converter:pageTitle')}
-          subtitle={t('base64Converter:pageSubtitle')}
-          icon={modeIcon[pageMode]}
-          iconColor={base64ConverterPageStyles.primaryColor}
-        />
+    <div className="p-4 w-full flex flex-col space-y-4 min-h-[520px] select-none animate-in fade-in duration-300">
+      <PageHeader
+        title={t('base64Converter:pageTitle')}
+        subtitle={t('base64Converter:pageSubtitle')}
+        icon={modeIcon[pageMode]}
+        iconColor={base64ConverterPageStyles.primaryColor}
+        className="pb-1"
+      />
 
-        <div className="flex flex-col gap-6">
-          <SwitchButtonGroup
-            value={pageMode}
-            options={[
-              { value: 'text', label: t('base64Converter:textMode') },
-              { value: 'file', label: t('base64Converter:fileMode') },
-              { value: 'image', label: t('base64Converter:imageMode') },
-            ]}
-            onChange={(value: PageMode) => setPageMode(value)}
-            size="small"
-          />
+      <SwitchButtonGroup
+        value={pageMode}
+        options={[
+          { value: 'text', label: t('base64Converter:textMode') },
+          { value: 'file', label: t('base64Converter:fileMode') },
+          { value: 'image', label: t('base64Converter:imageMode') },
+        ]}
+        onChange={(value: PageMode) => setPageMode(value)}
+        size="small"
+        className="w-full sm:w-auto"
+      />
 
-          {pageMode === 'text' && <TextMode onSwitchToImageMode={() => setPageMode('image')} />}
-          {pageMode === 'file' && <FileMode />}
-          {pageMode === 'image' && <ImageMode />}
-        </div>
+      <div className="w-full pt-1">
+        {pageMode === 'text' && <TextMode onSwitchToImageMode={() => setPageMode('image')} />}
+        {pageMode === 'file' && <Base64ConverterSection mode="file" />}
+        {pageMode === 'image' && <Base64ConverterSection mode="image" />}
       </div>
     </div>
   );
diff --git a/pages/Base64Converter/useBase64Converter.ts b/pages/Base64Converter/useBase64Converter.ts
new file mode 100644
index 0000000..b0d406b
--- /dev/null
+++ b/pages/Base64Converter/useBase64Converter.ts
@@ -0,0 +1,154 @@
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
+import { useTranslation } from 'react-i18next';
+import type { FileToBase64Result } from '@/utils/base64Converter';
+import {
+  base64ToBlob,
+  fileToBase64,
+  isFileSizeValid,
+  isSupportedImageExtension,
+  isSupportedImageType,
+  MAX_FILE_SIZE,
+} from '@/utils/base64Converter';
+
+interface FileInfo {
+  name: string;
+  size: number;
+  type: string;
+}
+
+interface UseBase64ConverterProps {
+  mode: 'file' | 'image';
+}
+
+export function useBase64Converter({ mode }: UseBase64ConverterProps) {
+  const { t } = useTranslation('base64Converter');
+
+  const [result, setResult] = useState<FileToBase64Result | null>(null);
+  const [info, setInfo] = useState<FileInfo | null>(null);
+  const [isLoading, setIsLoading] = useState(false);
+  const [isDragging, setIsDragging] = useState(false);
+  const fileInputRef = useRef<HTMLInputElement>(null);
+  const cancelRef = useRef(false);
+
+  const [decodeInput, setDecodeInput] = useState('');
+  const [debouncedDecodeInput, setDebouncedDecodeInput] = useState('');
+  const [encodeError, setEncodeError] = useState<string | null>(null);
+  const [customFileName, setCustomFileName] = useState('');
+
+  useEffect(() => {
+    const handle = setTimeout(() => {
+      setDebouncedDecodeInput(decodeInput);
+    }, 250);
+    return () => clearTimeout(handle);
+  }, [decodeInput]);
+
+  const resetAll = useCallback(() => {
+    cancelRef.current = true;
+    setResult(null);
+    setInfo(null);
+    setIsLoading(false);
+    setDecodeInput('');
+    setDebouncedDecodeInput('');
+    setCustomFileName('');
+    setEncodeError(null);
+    if (fileInputRef.current) fileInputRef.current.value = '';
+  }, []);
+
+  const handleFileSelect = useCallback(
+    async (file: File) => {
+      cancelRef.current = false;
+      setEncodeError(null);
+      setResult(null);
+      setInfo(null);
+
+      if (!isFileSizeValid(file.size)) {
+        setEncodeError(t('fileSizeExceeded', { max: `${MAX_FILE_SIZE / 1024 / 1024} MB` }));
+        return;
+      }
+
+      if (
+        mode === 'image' &&
+        !isSupportedImageType(file.type) &&
+        !isSupportedImageExtension(file.name)
+      ) {
+        setEncodeError(t('unsupportedImageType'));
+        return;
+      }
+
+      setInfo({
+        name: file.name,
+        size: file.size,
+        type: file.type || 'application/octet-stream',
+      });
+      setIsLoading(true);
+
+      try {
+        const res = await fileToBase64(file);
+        if (!cancelRef.current) setResult(res);
+      } catch (e) {
+        if (!cancelRef.current) {
+          setEncodeError(e instanceof Error ? e.message : t('conversionFailed'));
+        }
+      } finally {
+        if (!cancelRef.current) setIsLoading(false);
+      }
+    },
+    [mode, t],
+  );
+
+  const safeFileSelect = useCallback(
+    (file: File) => {
+      handleFileSelect(file).catch((err) => {
+        console.error(`Base64 [${mode}] pipeline crash:`, err);
+      });
+    },
+    [handleFileSelect, mode],
+  );
+
+  const decodePipeline = useMemo(() => {
+    const cleanedInput = debouncedDecodeInput.replace(/^data:image\/[a-z+]+;base64,/i, '').trim();
+    if (!cleanedInput) return { decoded: null, error: null };
+
+    try {
+      const res = base64ToBlob(cleanedInput);
+      return { decoded: res, error: null };
+    } catch (e) {
+      const message = e instanceof Error ? e.message : '';
+      return {
+        decoded: null,
+        error: message === 'Invalid Base64 string' ? t('invalidBase64') : t('conversionFailed'),
+      };
+    }
+  }, [debouncedDecodeInput, t]);
+
+  const decoded = decodePipeline.decoded;
+  const decodeError = decodePipeline.error;
+
+  const decodedFileName = useMemo(() => {
+    if (customFileName) return customFileName;
+    if (decoded) return `decoded${decoded.suggestedExtension}`;
+    return '';
+  }, [customFileName, decoded]);
+
+  // 💡 托管最大文件体积字符串算子，清除下游引入风险
+  const maxFileSizeStr = `${MAX_FILE_SIZE / 1024 / 1024} MB`;
+
+  return {
+    result,
+    info,
+    isLoading,
+    isDragging,
+    setIsDragging,
+    fileInputRef,
+    encodeError,
+    decodeInput,
+    setDecodeInput,
+    decoded,
+    decodeError,
+    decodedFileName,
+    setCustomFileName,
+    resetAll,
+    safeFileSelect,
+    maxFileSizeStr,
+  };
+}