feat: redesign upload workbench layout

src/App.test.tsx

@@ -15,12 +15,30 @@ describe('App bilingual UI', () => {
 
     expect(screen.getByLabelText('switch-ui-language-zh')).toHaveAttribute('aria-pressed', 'true');
     expect(screen.getByText('字幕语言')).toBeInTheDocument();
-    expect(screen.getByText('上传视频')).toBeInTheDocument();
+    expect(screen.getAllByText('上传视频').length).toBeGreaterThan(0);
 
     fireEvent.click(screen.getByLabelText('switch-ui-language-en'));
 
     expect(screen.getByLabelText('switch-ui-language-en')).toHaveAttribute('aria-pressed', 'true');
     expect(screen.getByText('Subtitle Language')).toBeInTheDocument();
-    expect(screen.getByText('Upload Video')).toBeInTheDocument();
+    expect(screen.getAllByText('Upload Video').length).toBeGreaterThan(0);
+  });
+
+  it('shows the upload workbench header and keeps the language switcher visible', () => {
+    render(<App />);
+
+    expect(screen.getByRole('banner')).toBeInTheDocument();
+    expect(screen.getByLabelText('switch-ui-language-zh')).toBeInTheDocument();
+    expect(screen.getByLabelText('switch-ui-language-en')).toBeInTheDocument();
+
+    fireEvent.click(screen.getByLabelText('switch-ui-language-en'));
+
+    expect(screen.getByRole('heading', { name: 'Upload & prepare' })).toBeInTheDocument();
+    expect(
+      screen.getByText(
+        'Upload a source video, tune subtitle defaults, and choose dubbing settings before generation.',
+      ),
+    ).toBeInTheDocument();
+    expect(screen.getByText('Video Translate')).toBeInTheDocument();
   });
 });

src/App.tsx

@@ -38,51 +38,82 @@ function AppContent() {
     setCurrentView('editor');
   };
 
+  const languageSwitcher = (
+    <div
+      aria-label="app-language-switcher"
+      className="inline-flex rounded-full border border-slate-200/80 bg-white/80 p-1 shadow-sm shadow-slate-200/60 backdrop-blur"
+    >
+      <button
+        type="button"
+        aria-label="switch-ui-language-zh"
+        aria-pressed={locale === 'zh'}
+        onClick={() => setLocale('zh')}
+        className={`px-3 py-1.5 text-sm rounded-full transition-colors ${
+          locale === 'zh' ? 'bg-slate-900 text-white' : 'text-slate-600 hover:bg-slate-100'
+        }`}
+      >
+        {m.app.chinese}
+      </button>
+      <button
+        type="button"
+        aria-label="switch-ui-language-en"
+        aria-pressed={locale === 'en'}
+        onClick={() => setLocale('en')}
+        className={`px-3 py-1.5 text-sm rounded-full transition-colors ${
+          locale === 'en' ? 'bg-slate-900 text-white' : 'text-slate-600 hover:bg-slate-100'
+        }`}
+      >
+        {m.app.english}
+      </button>
+    </div>
+  );
+
   return (
-    <div className="min-h-screen bg-gray-50 text-gray-800 font-sans">
-      <div className="mx-auto max-w-6xl px-8 pt-4">
-        <div className="flex justify-end">
-          <div
-            aria-label="app-language-switcher"
-            className="inline-flex rounded-full border border-gray-200 bg-white p-1 shadow-sm"
+    <div className="min-h-screen bg-[radial-gradient(circle_at_top_left,_rgba(14,165,233,0.10),_transparent_24%),radial-gradient(circle_at_top_right,_rgba(16,185,129,0.10),_transparent_22%),linear-gradient(180deg,_#f8fafc_0%,_#eef2ff_52%,_#f8fafc_100%)] text-slate-900 font-sans">
+      <div className="mx-auto max-w-7xl px-4 py-5 sm:px-6 sm:py-8 lg:px-8">
+        {currentView === 'upload' ? (
+          <header
+            role="banner"
+            className="mb-8 flex flex-col gap-5 rounded-[28px] border border-white/70 bg-white/75 px-5 py-5 shadow-[0_18px_60px_-32px_rgba(15,23,42,0.35)] backdrop-blur sm:px-6 lg:flex-row lg:items-start lg:justify-between"
           >
-            <button
-              type="button"
-              aria-label="switch-ui-language-zh"
-              aria-pressed={locale === 'zh'}
-              onClick={() => setLocale('zh')}
-              className={`px-3 py-1.5 text-sm rounded-full transition-colors ${
-                locale === 'zh' ? 'bg-gray-900 text-white' : 'text-gray-600 hover:bg-gray-100'
-              }`}
-            >
-              {m.app.chinese}
-            </button>
-            <button
-              type="button"
-              aria-label="switch-ui-language-en"
-              aria-pressed={locale === 'en'}
-              onClick={() => setLocale('en')}
-              className={`px-3 py-1.5 text-sm rounded-full transition-colors ${
-                locale === 'en' ? 'bg-gray-900 text-white' : 'text-gray-600 hover:bg-gray-100'
-              }`}
-            >
-              {m.app.english}
-            </button>
-          </div>
-        </div>
+            <div className="min-w-0 space-y-3">
+              <div className="flex flex-wrap items-center gap-3 text-sm">
+                <span className="rounded-full border border-sky-200 bg-sky-50 px-3 py-1 font-medium text-sky-700">
+                  {m.upload.workbenchEyebrow}
+                </span>
+                <span className="text-slate-500">{m.app.productName}</span>
+              </div>
+              <div className="space-y-2">
+                <h1 className="text-3xl font-semibold tracking-tight text-slate-950 sm:text-4xl">
+                  {m.upload.workbenchTitle}
+                </h1>
+                <p className="max-w-2xl text-sm leading-6 text-slate-600 sm:text-base">
+                  {m.upload.workbenchDescription}
+                </p>
+              </div>
+            </div>
+
+            <div className="flex justify-start lg:justify-end">{languageSwitcher}</div>
+          </header>
+        ) : (
+          <div className="mb-4 flex justify-end">{languageSwitcher}</div>
+        )}
+      </div>
+
+      <div className="mx-auto max-w-7xl px-4 pb-8 sm:px-6 lg:px-8">
+        {currentView === 'upload' ? (
+          <UploadScreen onUpload={handleVideoUpload} />
+        ) : (
+          <EditorScreen
+            videoFile={videoFile}
+            targetLanguage={targetLanguage}
+            ttsLanguage={ttsLanguage}
+            trimRange={trimRange}
+            initialSubtitleDefaults={subtitleDefaults}
+            onBack={() => setCurrentView('upload')}
+          />
+        )}
       </div>
-      {currentView === 'upload' ? (
-        <UploadScreen onUpload={handleVideoUpload} />
-      ) : (
-        <EditorScreen 
-          videoFile={videoFile} 
-          targetLanguage={targetLanguage}
-          ttsLanguage={ttsLanguage}
-          trimRange={trimRange}
-          initialSubtitleDefaults={subtitleDefaults}
-          onBack={() => setCurrentView('upload')} 
-        />
-      )}
     </div>
   );
 }

src/components/UploadScreen.test.tsx

@@ -56,6 +56,17 @@ describe('UploadScreen', () => {
     expect(preview).toHaveStyle({ fontSize: '32px', bottom: '18%' });
   });
 
+  it('renders upload, mode, subtitle defaults, and language cards inside the responsive workbench', () => {
+    renderUploadScreen();
+
+    expect(screen.getByTestId('upload-workbench')).toBeInTheDocument();
+    expect(screen.getByTestId('upload-dropzone-card')).toBeInTheDocument();
+    expect(screen.getByTestId('upload-settings-column')).toBeInTheDocument();
+    expect(screen.getByRole('heading', { name: 'Mode & Workflow' })).toBeInTheDocument();
+    expect(screen.getByRole('heading', { name: 'Subtitle Defaults' })).toBeInTheDocument();
+    expect(screen.getByRole('heading', { name: 'Language & Dubbing' })).toBeInTheDocument();
+  });
+
   it('shows a fixed English subtitle language and the supported TTS languages', () => {
     renderUploadScreen();
 
@@ -125,4 +136,12 @@ describe('UploadScreen', () => {
     expect(screen.queryByRole('button', { name: /close trim/i })).not.toBeInTheDocument();
     expect(screen.getByRole('button', { name: /generate translated video/i })).toBeDisabled();
   });
+
+  it('keeps the upload interaction wired through the redesigned dropzone card', () => {
+    renderUploadScreen();
+
+    expect(screen.getByTestId('upload-dropzone-card')).toContainElement(
+      screen.getByLabelText(/upload video file/i),
+    );
+  });
 });

src/components/UploadScreen.tsx

@@ -33,6 +33,10 @@ export default function UploadScreen({
   const [tempFile, setTempFile] = useState<File | null>(null);
   const [subtitleDefaults, setSubtitleDefaults] = useState<SubtitleDefaults>(DEFAULT_SUBTITLE_DEFAULTS);
   const fileInputRef = useRef<HTMLInputElement | null>(null);
+  const activeModeLabel = mode === 'editing' ? m.upload.editingMode : m.upload.simpleMode;
+  const activeModeDescription = mode === 'editing' ? m.upload.editingModeDesc : m.upload.simpleModeDesc;
+  const settingsCardClass =
+    'app-surface rounded-[28px] border border-white/70 px-5 py-5 shadow-[0_18px_60px_-34px_rgba(15,23,42,0.3)] sm:px-6';
 
   const clearPendingUpload = () => {
     setTempFile(null);
@@ -55,91 +59,145 @@ export default function UploadScreen({
   };
 
   return (
-    <div className="max-w-6xl mx-auto p-8 flex gap-8 h-screen items-center">
-      {/* Left: Upload Area */}
-      <div className="flex-1 bg-white rounded-lg shadow-sm border border-gray-200 p-8 flex flex-col items-center justify-center min-h-[400px]">
-        <div className="w-full h-full border-2 border-dashed border-gray-300 rounded-lg flex flex-col items-center justify-center bg-gray-50 relative">
-          <input
-            ref={fileInputRef}
-            type="file"
-            aria-label="Upload video file"
-            className="absolute inset-0 w-full h-full opacity-0 cursor-pointer"
-            accept="video/mp4,video/quicktime,video/webm"
-            onChange={handleFileChange}
-          />
-          <Upload className="w-16 h-16 text-gray-400 mb-4" />
-          <p className="text-gray-600 mb-6">{m.upload.clickToUpload}</p>
-          <button className="bg-[#52c41a] hover:bg-[#46a616] text-white px-8 py-3 rounded-md font-medium flex items-center gap-2 transition-colors w-full max-w-md justify-center pointer-events-none">
-            <Upload className="w-5 h-5" />
-            {m.upload.uploadVideo}
-          </button>
-        </div>
-        <p className="text-sm text-gray-500 mt-4 w-full text-left">
-          {m.upload.supportedFormats}
-        </p>
-      </div>
-
-      {/* Right: Settings */}
-      <div className="w-[400px] flex flex-col gap-6">
-        {/* Mode Selection */}
-        <div className="flex gap-4">
-          <div
-            className={`flex-1 p-4 rounded-lg border-2 cursor-pointer transition-colors ${
-              mode === 'editing' ? 'border-blue-500 bg-blue-50' : 'border-gray-200 hover:border-blue-200'
-            }`}
-            onClick={() => setMode('editing')}
-          >
-            <div className="flex items-center gap-2 mb-1">
-              {mode === 'editing' ? (
-                <CheckCircle2 className="w-5 h-5 text-blue-500" />
-              ) : (
-                <Circle className="w-5 h-5 text-gray-300" />
-              )}
-              <span className="font-semibold text-gray-800">{m.upload.editingMode}</span>
-            </div>
-            <p className="text-xs text-gray-500 ml-7">{m.upload.editingModeDesc}</p>
+    <div
+      data-testid="upload-workbench"
+      className="grid items-start gap-6 lg:gap-8 xl:grid-cols-[minmax(0,1.65fr)_minmax(320px,420px)]"
+    >
+      <section
+        data-testid="upload-dropzone-card"
+        className="app-surface min-w-0 rounded-[32px] border border-white/70 px-5 py-5 shadow-[0_24px_80px_-40px_rgba(15,23,42,0.35)] sm:px-6 sm:py-6 lg:px-8 lg:py-8"
+      >
+        <div className="mb-6 flex flex-col gap-4 sm:mb-8 lg:flex-row lg:items-start lg:justify-between">
+          <div className="min-w-0 space-y-2">
+            <h2 className="text-2xl font-semibold tracking-tight text-slate-950 sm:text-3xl">
+              {m.upload.uploadPanelTitle}
+            </h2>
+            <p className="max-w-2xl text-sm leading-6 text-slate-600 sm:text-base">
+              {m.upload.uploadPanelDescription}
+            </p>
           </div>
-          <div
-            className={`flex-1 p-4 rounded-lg border-2 cursor-pointer transition-colors ${
-              mode === 'simple' ? 'border-blue-500 bg-blue-50' : 'border-gray-200 hover:border-blue-200'
-            }`}
-            onClick={() => setMode('simple')}
-          >
-            <div className="flex items-center gap-2 mb-1">
-              {mode === 'simple' ? (
-                <CheckCircle2 className="w-5 h-5 text-blue-500" />
-              ) : (
-                <Circle className="w-5 h-5 text-gray-300" />
-              )}
-              <span className="font-semibold text-gray-800">{m.upload.simpleMode}</span>
-            </div>
-            <p className="text-xs text-gray-500 ml-7">{m.upload.simpleModeDesc}</p>
+
+          <div className="rounded-2xl border border-sky-100 bg-sky-50/80 px-4 py-3 text-left shadow-sm shadow-sky-100/50">
+            <p className="text-xs font-semibold uppercase tracking-[0.2em] text-sky-600">
+              {m.upload.modeWorkflowTitle}
+            </p>
+            <p className="mt-2 text-sm font-semibold text-slate-900">{activeModeLabel}</p>
+            <p className="mt-1 max-w-xs text-xs leading-5 text-slate-600">{activeModeDescription}</p>
           </div>
         </div>
 
-        <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-6">
-          <div className="flex items-start justify-between gap-4 mb-4">
-            <div>
-              <h3 className="font-semibold text-gray-800 mb-1">{m.upload.subtitleDefaults}</h3>
-              <p className="text-xs text-gray-500">
-                {m.upload.subtitleDefaultsDesc}
+        <div className="relative overflow-hidden rounded-[28px] border border-slate-200/80 bg-[linear-gradient(180deg,rgba(248,250,252,0.95)_0%,rgba(226,232,240,0.88)_100%)] p-3 sm:p-4">
+          <div className="absolute inset-0 bg-[radial-gradient(circle_at_top,_rgba(59,130,246,0.12),_transparent_38%)]" />
+          <div className="relative flex min-h-[360px] flex-col items-center justify-center rounded-[24px] border-2 border-dashed border-slate-300 bg-white/70 px-6 py-12 text-center sm:min-h-[420px] lg:min-h-[500px]">
+            <input
+              ref={fileInputRef}
+              type="file"
+              aria-label="Upload video file"
+              className="absolute inset-0 z-10 h-full w-full cursor-pointer opacity-0"
+              accept="video/mp4,video/quicktime,video/webm"
+              onChange={handleFileChange}
+            />
+
+            <div className="pointer-events-none relative z-0 flex max-w-xl flex-col items-center">
+              <div className="mb-6 rounded-full bg-slate-900 p-5 text-white shadow-lg shadow-slate-300/70">
+                <Upload className="h-10 w-10 sm:h-12 sm:w-12" />
+              </div>
+              <h3 className="text-xl font-semibold text-slate-900 sm:text-2xl">{m.upload.uploadVideo}</h3>
+              <p className="mt-3 max-w-md text-sm leading-6 text-slate-600 sm:text-base">
+                {m.upload.clickToUpload}
               </p>
+              <button className="mt-8 flex w-full max-w-sm items-center justify-center gap-2 rounded-2xl bg-[#16a34a] px-6 py-3.5 text-sm font-semibold text-white shadow-lg shadow-emerald-200 transition-colors pointer-events-none sm:text-base">
+                <Upload className="h-5 w-5" />
+                {m.upload.uploadVideo}
+              </button>
+            </div>
+          </div>
+        </div>
+
+        <div className="mt-5 flex flex-col gap-3 text-sm text-slate-500 md:flex-row md:items-center md:justify-between">
+          <p>{m.upload.supportedFormats}</p>
+          <div className="inline-flex items-center rounded-full border border-slate-200 bg-white/80 px-3 py-1.5 font-medium text-slate-700">
+            {activeModeLabel}
+          </div>
+        </div>
+      </section>
+
+      <aside
+        data-testid="upload-settings-column"
+        className="min-w-0 space-y-5 xl:sticky xl:top-6"
+      >
+        <section className={settingsCardClass}>
+          <div className="mb-4">
+            <h2 className="text-lg font-semibold text-slate-950">{m.upload.modeWorkflowTitle}</h2>
+            <p className="mt-1 text-sm leading-6 text-slate-600">{m.upload.modeWorkflowDescription}</p>
+          </div>
+
+          <div className="grid gap-3 sm:grid-cols-2 xl:grid-cols-1">
+            <button
+              type="button"
+              aria-pressed={mode === 'editing'}
+              className={`rounded-2xl border px-4 py-4 text-left transition-all ${
+                mode === 'editing'
+                  ? 'border-sky-400 bg-sky-50 shadow-sm shadow-sky-100'
+                  : 'border-slate-200 bg-white/80 hover:border-sky-200 hover:bg-slate-50'
+              }`}
+              onClick={() => setMode('editing')}
+            >
+              <div className="flex items-center gap-3">
+                {mode === 'editing' ? (
+                  <CheckCircle2 className="h-5 w-5 text-sky-600" />
+                ) : (
+                  <Circle className="h-5 w-5 text-slate-300" />
+                )}
+                <span className="font-semibold text-slate-900">{m.upload.editingMode}</span>
+              </div>
+              <p className="mt-3 text-sm leading-6 text-slate-600">{m.upload.editingModeDesc}</p>
+            </button>
+
+            <button
+              type="button"
+              aria-pressed={mode === 'simple'}
+              className={`rounded-2xl border px-4 py-4 text-left transition-all ${
+                mode === 'simple'
+                  ? 'border-sky-400 bg-sky-50 shadow-sm shadow-sky-100'
+                  : 'border-slate-200 bg-white/80 hover:border-sky-200 hover:bg-slate-50'
+              }`}
+              onClick={() => setMode('simple')}
+            >
+              <div className="flex items-center gap-3">
+                {mode === 'simple' ? (
+                  <CheckCircle2 className="h-5 w-5 text-sky-600" />
+                ) : (
+                  <Circle className="h-5 w-5 text-slate-300" />
+                )}
+                <span className="font-semibold text-slate-900">{m.upload.simpleMode}</span>
+              </div>
+              <p className="mt-3 text-sm leading-6 text-slate-600">{m.upload.simpleModeDesc}</p>
+            </button>
+          </div>
+        </section>
+
+        <section className={settingsCardClass}>
+          <div className="mb-4 flex items-start justify-between gap-4">
+            <div>
+              <h2 className="text-lg font-semibold text-slate-950">{m.upload.subtitleDefaults}</h2>
+              <p className="mt-1 text-sm leading-6 text-slate-600">{m.upload.subtitleDefaultsDesc}</p>
             </div>
             <button
               type="button"
-              className="text-sm text-blue-600 hover:text-blue-700 font-medium"
+              className="text-sm font-medium text-sky-700 transition-colors hover:text-sky-800"
               onClick={() => setSubtitleDefaults(DEFAULT_SUBTITLE_DEFAULTS)}
             >
               {m.upload.reset}
             </button>
           </div>
 
-          <div className="rounded-xl border border-gray-200 bg-slate-950 p-4 mb-4">
-            <div className="relative h-48 rounded-lg overflow-hidden bg-[radial-gradient(circle_at_top,_rgba(148,163,184,0.35),_transparent_40%),linear-gradient(180deg,_#1e293b_0%,_#0f172a_100%)]">
+          <div className="mb-5 rounded-[24px] border border-slate-200 bg-slate-950/95 p-3">
+            <div className="relative h-40 overflow-hidden rounded-[18px] bg-[radial-gradient(circle_at_top,_rgba(148,163,184,0.35),_transparent_40%),linear-gradient(180deg,_#1e293b_0%,_#0f172a_100%)] sm:h-44">
               <div className="absolute inset-0 bg-[linear-gradient(90deg,transparent_0%,rgba(255,255,255,0.04)_50%,transparent_100%)]" />
               <p
                 data-testid="upload-subtitle-preview"
-                className="absolute left-1/2 -translate-x-1/2 text-white font-semibold text-center whitespace-pre-wrap max-w-[88%] px-3 py-1"
+                className="absolute left-1/2 max-w-[88%] -translate-x-1/2 whitespace-pre-wrap px-3 py-1 text-center font-semibold text-white"
                 style={{
                   bottom: `${subtitleDefaults.bottomOffsetPercent}%`,
                   fontSize: `${subtitleDefaults.fontSize}px`,
@@ -153,11 +211,13 @@ export default function UploadScreen({
 
           <div className="space-y-4">
             <div>
-              <div className="flex items-center justify-between mb-2">
-                <label htmlFor="subtitle-position" className="text-sm font-medium text-gray-700">
+              <div className="mb-2 flex items-center justify-between">
+                <label htmlFor="subtitle-position" className="text-sm font-medium text-slate-700">
                   {m.upload.subtitleInitialPosition}
                 </label>
-                <span className="text-xs text-gray-500">{format(m.upload.fromBottom, { value: subtitleDefaults.bottomOffsetPercent })}</span>
+                <span className="text-xs text-slate-500">
+                  {format(m.upload.fromBottom, { value: subtitleDefaults.bottomOffsetPercent })}
+                </span>
               </div>
               <input
                 id="subtitle-position"
@@ -173,16 +233,18 @@ export default function UploadScreen({
                     bottomOffsetPercent: Number(e.target.value),
                   }))
                 }
-                className="w-full accent-blue-500"
+                className="w-full accent-sky-500"
               />
             </div>
 
             <div>
-              <div className="flex items-center justify-between mb-2">
-                <label htmlFor="subtitle-size" className="text-sm font-medium text-gray-700">
+              <div className="mb-2 flex items-center justify-between">
+                <label htmlFor="subtitle-size" className="text-sm font-medium text-slate-700">
                   {m.upload.subtitleInitialSize}
                 </label>
-                <span className="text-xs text-gray-500">{format(m.upload.pxValue, { value: subtitleDefaults.fontSize })}</span>
+                <span className="text-xs text-slate-500">
+                  {format(m.upload.pxValue, { value: subtitleDefaults.fontSize })}
+                </span>
               </div>
               <input
                 id="subtitle-size"
@@ -198,48 +260,61 @@ export default function UploadScreen({
                     fontSize: Number(e.target.value),
                   }))
                 }
-                className="w-full accent-blue-500"
+                className="w-full accent-sky-500"
               />
             </div>
           </div>
-        </div>
+        </section>
 
-        {/* Language Selection */}
-        <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-6 flex-1 flex flex-col">
+        <section className={`${settingsCardClass} flex flex-col`}>
           <div className="mb-5">
-            <h3 className="font-semibold text-gray-800 mb-1">{m.upload.subtitleLanguage}</h3>
-            <p className="text-xs text-gray-500 mb-3">{m.upload.subtitleLanguageHint}</p>
-            <div className="inline-flex items-center rounded-md border border-gray-200 bg-gray-50 px-3 py-2 text-sm font-medium text-gray-700">
+            <h2 className="text-lg font-semibold text-slate-950">{m.upload.languageDubbingTitle}</h2>
+            <p className="mt-1 text-sm leading-6 text-slate-600">{m.upload.languageDubbingDescription}</p>
+          </div>
+
+          <div className="mb-5 rounded-2xl border border-slate-200 bg-white/80 p-4">
+            <h3 className="font-semibold text-slate-900">{m.upload.subtitleLanguage}</h3>
+            <p className="mt-1 text-xs text-slate-500">{m.upload.subtitleLanguageHint}</p>
+            <div className="mt-3 inline-flex items-center rounded-xl border border-slate-200 bg-slate-50 px-3 py-2 text-sm font-medium text-slate-700">
               {m.upload.languages.en}
             </div>
           </div>
 
-          <h3 className="font-semibold text-gray-800 mb-1">{m.upload.ttsLanguage}</h3>
-          <p className="text-xs text-gray-500 mb-4">{m.upload.ttsLanguageHint}</p>
-
-          {/* Alphabet Tabs */}
-          <div className="flex gap-4 border-b border-gray-100 pb-2 mb-4 text-sm text-gray-500 overflow-x-auto">
-            <button className="font-medium text-blue-600 border-b-2 border-blue-600 pb-2 -mb-[9px]">{m.upload.popular}</button>
-            <button className="hover:text-gray-800">{m.upload.groupABC}</button>
-            <button className="hover:text-gray-800">{m.upload.groupGHI}</button>
-            <button className="hover:text-gray-800">{m.upload.groupDEF}</button>
+          <div className="mb-4">
+            <h3 className="font-semibold text-slate-900">{m.upload.ttsLanguage}</h3>
+            <p className="mt-1 text-xs text-slate-500">{m.upload.ttsLanguageHint}</p>
           </div>
 
-          {/* Language List */}
-          <div className="flex-1 overflow-y-auto pr-2 custom-scrollbar">
+          <div className="mb-4 flex gap-4 overflow-x-auto border-b border-slate-200 pb-2 text-sm text-slate-500">
+            <button type="button" className="border-b-2 border-sky-600 pb-2 font-medium text-sky-600 -mb-[9px]">
+              {m.upload.popular}
+            </button>
+            <button type="button" className="hover:text-slate-800">
+              {m.upload.groupABC}
+            </button>
+            <button type="button" className="hover:text-slate-800">
+              {m.upload.groupGHI}
+            </button>
+            <button type="button" className="hover:text-slate-800">
+              {m.upload.groupDEF}
+            </button>
+          </div>
+
+          <div className="custom-scrollbar max-h-[280px] flex-1 overflow-y-auto pr-2">
             {['C', 'E', 'F', 'G', 'I'].map((letter) => (
-              <div key={letter} className="flex border-b border-gray-100 py-3 last:border-0">
-                <div className="w-8 text-green-600 font-medium">{letter}</div>
-                <div className="flex flex-wrap gap-x-6 gap-y-2 flex-1">
+              <div key={letter} className="flex border-b border-slate-100 py-3 last:border-0">
+                <div className="w-8 font-medium text-emerald-600">{letter}</div>
+                <div className="flex flex-1 flex-wrap gap-x-3 gap-y-2 sm:gap-x-4">
                   {LANGUAGES.filter((l) => l.group === letter).map((lang) => (
                     <button
                       key={lang.code}
-                      className={`text-sm hover:text-blue-600 transition-colors ${
+                      type="button"
+                      className={`rounded-full px-2.5 py-1 text-sm transition-colors ${
                         selectedTtsLanguage === lang.code
-                          ? 'bg-green-600 text-white px-2 py-0.5 rounded'
+                          ? 'bg-emerald-600 text-white'
                           : lang.code === 'zh' || lang.code === 'yue'
-                          ? 'text-orange-500'
-                          : 'text-gray-700'
+                          ? 'text-orange-500 hover:bg-orange-50'
+                          : 'text-slate-700 hover:bg-slate-100 hover:text-sky-700'
                       }`}
                       onClick={() => setSelectedTtsLanguage(lang.code)}
                     >
@@ -252,10 +327,10 @@ export default function UploadScreen({
           </div>
 
           <button
-            className={`w-full py-3 rounded-md font-medium mt-4 transition-colors ${
+            className={`mt-5 w-full rounded-2xl px-4 py-3.5 text-sm font-semibold transition-colors sm:text-base ${
               tempFile
-                ? 'bg-[#52c41a] hover:bg-[#46a616] text-white' 
-                : 'bg-gray-200 text-gray-400 cursor-not-allowed'
+                ? 'bg-[#16a34a] text-white shadow-lg shadow-emerald-200 hover:bg-[#15803d]'
+                : 'cursor-not-allowed bg-slate-200 text-slate-400'
             }`}
             onClick={() => {
               if (tempFile) setShowTrimModal(true);
@@ -264,8 +339,8 @@ export default function UploadScreen({
           >
             {m.upload.generateTranslatedVideo}
           </button>
-        </div>
-      </div>
+        </section>
+      </aside>
 
       {showTrimModal && tempFile && (
         <TrimModal

src/i18n.tsx

@@ -10,6 +10,15 @@ const messages = {
       productName: 'Translate 1.0',
     },
     upload: {
+      workbenchEyebrow: 'Video Translate',
+      workbenchTitle: '\u4e0a\u4f20\u5e76\u51c6\u5907',
+      workbenchDescription: '\u4e0a\u4f20\u6e90\u89c6\u9891\uff0c\u8c03\u6574\u5b57\u5e55\u9ed8\u8ba4\u6837\u5f0f\uff0c\u5e76\u5728\u751f\u6210\u524d\u9009\u62e9\u914d\u97f3\u8bbe\u7f6e\u3002',
+      uploadPanelTitle: '\u4e0a\u4f20\u6e90\u89c6\u9891',
+      uploadPanelDescription: '\u62d6\u62fd\u6216\u70b9\u51fb\u9009\u62e9\u89c6\u9891\u6587\u4ef6\uff0c\u6211\u4eec\u4f1a\u5728\u4e0b\u4e00\u6b65\u8fdb\u5165\u88c1\u526a\u548c\u7ffb\u8bd1\u6d41\u7a0b\u3002',
+      modeWorkflowTitle: '\u6a21\u5f0f\u4e0e\u6d41\u7a0b',
+      modeWorkflowDescription: '\u9009\u62e9\u4f60\u5e0c\u671b\u7684\u5de5\u4f5c\u65b9\u5f0f\uff0c\u4fdd\u6301\u5f53\u524d\u7ffb\u8bd1\u6d41\u7a0b\u4e0d\u53d8\u3002',
+      languageDubbingTitle: '\u8bed\u8a00\u4e0e\u914d\u97f3',
+      languageDubbingDescription: '\u786e\u8ba4\u5b57\u5e55\u8bed\u8a00\u4e0e TTS \u76ee\u6807\u8bed\u8a00\uff0c\u518d\u8fdb\u5165\u751f\u6210\u6d41\u7a0b\u3002',
       uploadVideoFile: '\u4e0a\u4f20\u89c6\u9891\u6587\u4ef6',
       clickToUpload: '\u70b9\u51fb\u4e0a\u4f20\u6216\u5c06\u89c6\u9891\u62d6\u62fd\u5230\u6b64\u5904',
       uploadVideo: '\u4e0a\u4f20\u89c6\u9891',
@@ -134,6 +143,19 @@ const messages = {
       productName: 'Translate 1.0',
     },
     upload: {
+      workbenchEyebrow: 'Video Translate',
+      workbenchTitle: 'Upload & prepare',
+      workbenchDescription:
+        'Upload a source video, tune subtitle defaults, and choose dubbing settings before generation.',
+      uploadPanelTitle: 'Upload source video',
+      uploadPanelDescription:
+        'Drop a video here or browse from your device. We will move into trim and translation setup next.',
+      modeWorkflowTitle: 'Mode & Workflow',
+      modeWorkflowDescription:
+        'Choose the workflow that best fits your editing needs while keeping the translation flow intact.',
+      languageDubbingTitle: 'Language & Dubbing',
+      languageDubbingDescription:
+        'Confirm the subtitle language and the dubbing target before starting generation.',
       uploadVideoFile: 'Upload video file',
       clickToUpload: 'Click to upload or drag files here',
       uploadVideo: 'Upload Video',

src/index.css

@@ -1,5 +1,10 @@
 @import "tailwindcss";
 
+.app-surface {
+  background: rgba(255, 255, 255, 0.82);
+  backdrop-filter: blur(18px);
+}
+
 .custom-scrollbar::-webkit-scrollbar {
   width: 6px;
   height: 6px;