Merge branch 'develop'

# Conflicts:
#	src/pages/JsonTools/__tests__/useJsonTools.test.ts
#	src/pages/JsonTools/components/JsonDiffPanel.tsx
#	src/pages/JsonTools/useJsonTools.ts

src/components/PageSkeleton.tsx

@@ -1,41 +0,0 @@
-/**
- * PageSkeleton 组件 - 页面加载骨架屏
- *
- * 用于 Suspense fallback 和初始加载状态，提供平滑的视觉过渡
- * 避免白屏闪烁，减少布局偏移
- */
-
-/**
- * 工具页面骨架屏
- */
-function ToolPageSkeleton() {
-  return (
-    <div className="p-5">
-      {/* 标题区域 */}
-      <div className="w-44 h-7 bg-muted rounded animate-pulse mb-4" />
-
-      {/* 输入区域 */}
-      <div className="w-full h-[120px] bg-muted rounded-xl animate-pulse mb-4" />
-
-      {/* 控制栏 */}
-      <div className="flex gap-2 mb-4">
-        <div className="w-24 h-9 bg-muted rounded-lg animate-pulse" />
-        <div className="w-20 h-9 bg-muted rounded-lg animate-pulse" />
-        <div className="flex-1" />
-        <div className="w-24 h-9 bg-muted rounded-lg animate-pulse" />
-      </div>
-
-      {/* 结果区域 */}
-      <div className="w-full h-[160px] bg-muted rounded-xl animate-pulse" />
-    </div>
-  );
-}
-
-/**
- * 页面加载骨架屏
- */
-export default function PageSkeleton() {
-  return <ToolPageSkeleton />;
-}
-
-PageSkeleton.displayName = 'PageSkeleton';

src/components/README.md

@@ -6,7 +6,7 @@
 
 | 组件                    | 用途                                                                                                   |
 | ----------------------- | ------------------------------------------------------------------------------------------------------ |
-| `RouterContainer.tsx`   | 路由容器，根据当前路由动态渲染对应页面组件，集成错误边界和骨架屏                                       |
+| `RouterContainer.tsx`   | 路由容器，根据当前路由动态渲染对应页面组件，集成错误边界                                               |
 | `SwitchButtonGroup.tsx` | 通用切换按钮组，支持 `small/medium/large` 三种尺寸，用于页面子模式切换                                 |
 | `EmptyPlaceholder.tsx`  | 虚线边框空状态占位，统一工具页「暂无结果」提示样式                                                     |
 | `TextInputArea.tsx`     | 增强文本输入区域，支持校验规则、工具栏操作、字符计数、清空                                             |
@@ -17,7 +17,6 @@
 | `GlobalSnackbar.tsx`    | 全局消息提示组件 + Context Provider，支持受控/Hook/全局单例三种使用方式                                |
 | `ErrorBoundary.tsx`     | 全局错误边界（类组件），捕获子组件树 JS 错误并展示友好错误页面                                         |
 | `PageErrorBoundary.tsx` | 页面级错误边界，适配 shadcn 暗黑模式，支持 `resetKey` 自动恢复                                         |
-| `PageSkeleton.tsx`      | 页面骨架屏，提供 `dashboard` 和 `tool` 两种变体，用于 Suspense fallback                                |
 
 ## 使用约定
 

src/components/RouterContainer.tsx

@@ -4,7 +4,6 @@ import { useRouter } from '@/providers/RouterProvider';
 import type { PageType } from '@/types/storage';
 import { type ComponentType, useEffect, useState } from 'react';
 import PageErrorBoundary from '@/components/PageErrorBoundary';
-import PageSkeleton from '@/components/PageSkeleton';
 import { cn } from '@/lib/utils';
 import { AlertTriangle } from 'lucide-react';
 
@@ -30,7 +29,7 @@ function LoadedPage({ pageKey }: { pageKey: PageType }) {
   }, [pageKey]);
 
   if (!Page) {
-    return <PageSkeleton />;
+    return <div className="flex-1" aria-hidden="true" />;
   }
 
   return <Page />;

src/components/SwitchButtonGroup.tsx

@@ -15,7 +15,6 @@ export interface SwitchButtonGroupProps<T extends string | number = string> exte
   options: SwitchOption<T>[];
   onChange: (value: T) => void;
   size?: 'small' | 'medium' | 'large';
-  buttonClassName?: string;
 }
 
 const SIZE_CLASSES = {
@@ -24,8 +23,12 @@ const SIZE_CLASSES = {
   large: 'text-base h-11 px-4 py-2 rounded-lg',
 } as const;
 
-const SELECTED_CLASSES = 'bg-background text-foreground shadow-sm font-semibold fade-in-zoom-95';
-const UNSELECTED_CLASSES = 'hover:bg-background/50 hover:text-foreground/80';
+const INTERACTIVE_CLASSES =
+  'active:scale-[0.98] focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-1 focus-visible:ring-offset-muted';
+
+const SELECTED_CLASSES =
+  'bg-background text-foreground shadow-sm font-semibold hover:bg-background hover:text-foreground';
+const UNSELECTED_CLASSES = 'text-muted-foreground hover:bg-accent hover:text-accent-foreground';
 
 export default function SwitchButtonGroup<T extends string | number = string>({
   value,
@@ -33,13 +36,12 @@ export default function SwitchButtonGroup<T extends string | number = string>({
   onChange,
   size = 'medium',
   className,
-  buttonClassName,
   ...props
 }: SwitchButtonGroupProps<T>) {
   return (
     <div
       className={cn(
-        'inline-flex w-full items-center justify-center rounded-lg bg-muted text-muted-foreground p-1',
+        'inline-flex w-full items-center justify-center rounded-lg bg-muted p-1',
         className,
       )}
       {...props}
@@ -53,8 +55,8 @@ export default function SwitchButtonGroup<T extends string | number = string>({
           className={cn(
             'flex-1 transition-all',
             SIZE_CLASSES[size],
+            INTERACTIVE_CLASSES,
             value === option.value ? SELECTED_CLASSES : UNSELECTED_CLASSES,
-            buttonClassName,
           )}
         >
           {option.label}

src/components/TextInputArea.tsx

@@ -42,6 +42,15 @@ export interface TextInputAreaProps extends Omit<
   title?: string;
   externalError?: string;
   onClear?: () => void;
+
+  /**
+   * 撑满父容器高度并启用内部滚动（而非按 minRows/maxRows 自动撑高）。
+   * 用于需要固定高度 + 内部滚动的卡片面板。
+   */
+  fill?: boolean;
+
+  /** 是否无边框、无阴影、无圆角（适用于嵌套在其他有边框的容器中） */
+  borderless?: boolean;
 }
 
 function ActionButton({
@@ -106,6 +115,8 @@ const TextInputArea = forwardRef<HTMLTextAreaElement, TextInputAreaProps>((props
     title,
     externalError,
     onClear,
+    fill = false,
+    borderless = false,
     ...restProps
   } = props;
 
@@ -122,6 +133,7 @@ const TextInputArea = forwardRef<HTMLTextAreaElement, TextInputAreaProps>((props
   useImperativeHandle(ref, () => internalRef.current as HTMLTextAreaElement);
 
   const adjustHeight = useCallback(() => {
+    if (fill) return;
     const textArea = internalRef.current;
     if (!textArea) return;
 
@@ -132,7 +144,7 @@ const TextInputArea = forwardRef<HTMLTextAreaElement, TextInputAreaProps>((props
     const nextHeight = Math.max(textArea.scrollHeight, computedMin);
 
     textArea.style.height = `${Math.min(nextHeight, computedMax)}px`;
-  }, [minRows, maxRows]);
+  }, [minRows, maxRows, fill]);
 
   React.useEffect(() => {
     adjustHeight();
@@ -204,7 +216,7 @@ const TextInputArea = forwardRef<HTMLTextAreaElement, TextInputAreaProps>((props
   const hasBottomBar = allowCopy || showClear || bottomActions.length > 0;
 
   return (
-    <div className={cn('w-full flex flex-col gap-1.5', className)}>
+    <div className={cn('w-full flex flex-col gap-1.5', fill && 'flex-1 min-h-0', className)}>
       {hasTopBar && (
         <div className="flex items-center justify-between px-0.5">
           <div className="flex items-center gap-2">
@@ -233,7 +245,11 @@ const TextInputArea = forwardRef<HTMLTextAreaElement, TextInputAreaProps>((props
 
       <div
         className={cn(
-          'rounded-md border border-input bg-background shadow-sm transition-all focus-within:ring-1 focus-within:ring-ring focus-within:border-input overflow-hidden',
+          borderless
+            ? 'bg-transparent overflow-hidden'
+            : 'rounded-md border border-input bg-background shadow-sm transition-all focus-within:ring-1 focus-within:ring-ring focus-within:border-input overflow-hidden',
+          fill && 'flex-1 min-h-0 flex flex-col',
+          !borderless &&
             displayError &&
             'border-destructive focus-within:ring-destructive focus-within:border-destructive',
         )}
@@ -247,7 +263,10 @@ const TextInputArea = forwardRef<HTMLTextAreaElement, TextInputAreaProps>((props
           autoFocus={autoFocus}
           readOnly={readOnly}
           placeholder={placeholder}
-          className="w-full bg-transparent px-4 py-3 font-mono text-sm leading-relaxed text-foreground placeholder:text-muted-foreground/50 focus:outline-none resize-none border-0 block"
+          className={cn(
+            'w-full bg-transparent px-4 py-3 font-mono text-sm leading-relaxed text-foreground placeholder:text-muted-foreground/50 focus:outline-none resize-none border-0 block',
+            fill && 'flex-1 h-full overflow-auto diff-scroll',
+          )}
           {...restProps}
         />
 

src/components/__tests__/PageSkeleton.test.tsx

@@ -1,32 +0,0 @@
-import { describe, expect, it } from 'vitest';
-import { render } from '@testing-library/react';
-import PageSkeleton from '@/components/PageSkeleton';
-
-describe('PageSkeleton 组件', () => {
-  describe('渲染测试', () => {
-    it('应渲染工具页面骨架', () => {
-      const { container } = render(<PageSkeleton />);
-
-      const skeletons = container.querySelectorAll('.animate-pulse');
-      expect(skeletons.length).toBeGreaterThan(0);
-    });
-  });
-
-  describe('布局结构测试', () => {
-    it('工具骨架屏应有内边距', () => {
-      const { container } = render(<PageSkeleton />);
-      const toolContainer = container.firstChild as HTMLElement;
-
-      expect(toolContainer).toHaveClass('p-5');
-    });
-  });
-
-  describe('骨架屏元素测试', () => {
-    it('工具骨架屏应包含动画脉冲效果', () => {
-      const { container } = render(<PageSkeleton />);
-
-      const skeletons = container.querySelectorAll('.animate-pulse');
-      expect(skeletons.length).toBeGreaterThan(0);
-    });
-  });
-});

src/components/__tests__/SwitchButtonGroup.test.tsx

@@ -22,7 +22,7 @@ describe('SwitchButtonGroup 组件', () => {
     const buttonB = screen.getByRole('button', { name: /选项B/i });
 
     expect(buttonA).toHaveClass('bg-background', 'text-foreground', 'shadow-sm');
-    expect(buttonB).toHaveClass('hover:bg-background/50');
+    expect(buttonB).toHaveClass('hover:bg-accent', 'hover:text-accent-foreground');
   });
 
   it('点击未选中按钮时应触发 onChange 并传入选中值', () => {
@@ -34,11 +34,12 @@ describe('SwitchButtonGroup 组件', () => {
     expect(handleChange).toHaveBeenCalledWith('b');
   });
 
-  it('点击已选中按钮时不应触发 onChange', () => {
+  it('点击已选中按钮时仍会触发 onChange 并传回原值', () => {
     const handleChange = vi.fn();
     render(<SwitchButtonGroup value="a" options={options} onChange={handleChange} />);
 
     fireEvent.click(screen.getByRole('button', { name: /选项A/i }));
+    expect(handleChange).toHaveBeenCalledTimes(1);
     expect(handleChange).toHaveBeenCalledWith('a');
   });
 
@@ -58,13 +59,6 @@ describe('SwitchButtonGroup 组件', () => {
     expect(button).toHaveClass('text-xs');
   });
 
-  it('应支持 buttonSx 自定义按钮样式', () => {
-    render(<SwitchButtonGroup value="a" options={options} onChange={vi.fn()} />);
-
-    const button = screen.getByRole('button', { name: /选项A/i });
-    expect(button).toBeInTheDocument();
-  });
-
   it('应支持 ReactNode 类型的 label', () => {
     const nodeOptions = [{ value: 'x', label: <span data-testid="custom-label">自定义</span> }];
     render(<SwitchButtonGroup value="x" options={nodeOptions} onChange={vi.fn()} />);
@@ -72,20 +66,6 @@ describe('SwitchButtonGroup 组件', () => {
     expect(screen.getByTestId('custom-label')).toBeInTheDocument();
   });
 
-  it('默认按钮样式应禁止文字换行', () => {
-    render(<SwitchButtonGroup value="a" options={options} onChange={vi.fn()} />);
-
-    const button = screen.getByRole('button', { name: /选项A/i });
-    expect(button).toHaveClass('whitespace-nowrap');
-  });
-
-  it('buttonSx 传入时应覆盖默认换行样式', () => {
-    render(<SwitchButtonGroup value="a" options={options} onChange={vi.fn()} />);
-
-    const button = screen.getByRole('button', { name: /选项A/i });
-    expect(button).toBeInTheDocument();
-  });
-
   describe('number 类型支持', () => {
     const numberOptions = [
       { value: 2, label: '2' },
@@ -105,7 +85,7 @@ describe('SwitchButtonGroup 组件', () => {
       const button2 = screen.getByRole('button', { name: /^2$/i });
       const button4 = screen.getByRole('button', { name: /^4$/i });
 
-      expect(button2).toHaveClass('hover:bg-background/50');
+      expect(button2).toHaveClass('hover:bg-accent', 'hover:text-accent-foreground');
       expect(button4).toHaveClass('bg-background', 'text-foreground', 'shadow-sm');
     });
 

src/components/ui/badge.tsx

@@ -22,11 +22,11 @@ const badgeVariants = cva(
   },
 );
 
-export interface BadgeProps
+interface BadgeProps
   extends React.HTMLAttributes<HTMLDivElement>, VariantProps<typeof badgeVariants> {}
 
 function Badge({ className, variant, ...props }: BadgeProps) {
   return <div className={cn(badgeVariants({ variant }), className)} {...props} />;
 }
 
-export { Badge, badgeVariants };
+export { Badge };

src/components/ui/button.tsx

@@ -46,4 +46,4 @@ const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
 );
 Button.displayName = 'Button';
 
-export { Button, buttonVariants };
+export { Button };

src/components/ui/checkbox.tsx

@@ -5,7 +5,7 @@ import { Check } from 'lucide-react';
 import { cn } from '@/lib/utils';
 
 const Checkbox = React.forwardRef<
-  React.ElementRef<typeof CheckboxPrimitive.Root>,
+  React.ComponentRef<typeof CheckboxPrimitive.Root>,
   React.ComponentPropsWithoutRef<typeof CheckboxPrimitive.Root>
 >(({ className, ...props }, ref) => (
   <CheckboxPrimitive.Root

src/components/ui/dialog.tsx

@@ -12,7 +12,7 @@ const DialogPortal = DialogPrimitive.Portal;
 const DialogClose = DialogPrimitive.Close;
 
 const DialogOverlay = React.forwardRef<
-  React.ElementRef<typeof DialogPrimitive.Overlay>,
+  React.ComponentRef<typeof DialogPrimitive.Overlay>,
   React.ComponentPropsWithoutRef<typeof DialogPrimitive.Overlay>
 >(({ className, ...props }, ref) => (
   <DialogPrimitive.Overlay
@@ -33,7 +33,7 @@ interface DialogContentProps extends React.ComponentPropsWithoutRef<
 }
 
 const DialogContent = React.forwardRef<
-  React.ElementRef<typeof DialogPrimitive.Content>,
+  React.ComponentRef<typeof DialogPrimitive.Content>,
   DialogContentProps
 >(({ className, children, showCloseButton = true, ...props }, ref) => (
   <DialogPortal>
@@ -72,7 +72,7 @@ const DialogFooter = ({ className, ...props }: React.HTMLAttributes<HTMLDivEleme
 DialogFooter.displayName = 'DialogFooter';
 
 const DialogTitle = React.forwardRef<
-  React.ElementRef<typeof DialogPrimitive.Title>,
+  React.ComponentRef<typeof DialogPrimitive.Title>,
   React.ComponentPropsWithoutRef<typeof DialogPrimitive.Title>
 >(({ className, ...props }, ref) => (
   <DialogPrimitive.Title
@@ -84,7 +84,7 @@ const DialogTitle = React.forwardRef<
 DialogTitle.displayName = DialogPrimitive.Title.displayName;
 
 const DialogDescription = React.forwardRef<
-  React.ElementRef<typeof DialogPrimitive.Description>,
+  React.ComponentRef<typeof DialogPrimitive.Description>,
   React.ComponentPropsWithoutRef<typeof DialogPrimitive.Description>
 >(({ className, ...props }, ref) => (
   <DialogPrimitive.Description

src/components/ui/label.tsx

@@ -9,7 +9,7 @@ const labelVariants = cva(
 );
 
 const Label = React.forwardRef<
-  React.ElementRef<typeof LabelPrimitive.Root>,
+  React.ComponentRef<typeof LabelPrimitive.Root>,
   React.ComponentPropsWithoutRef<typeof LabelPrimitive.Root> & VariantProps<typeof labelVariants>
 >(({ className, ...props }, ref) => (
   <LabelPrimitive.Root ref={ref} className={cn(labelVariants(), className)} {...props} />

src/components/ui/select.tsx

@@ -10,7 +10,7 @@ const SelectGroup = SelectPrimitive.Group;
 const SelectValue = SelectPrimitive.Value;
 
 const SelectTrigger = React.forwardRef<
-  React.ElementRef<typeof SelectPrimitive.Trigger>,
+  React.ComponentRef<typeof SelectPrimitive.Trigger>,
   React.ComponentPropsWithoutRef<typeof SelectPrimitive.Trigger>
 >(({ className, children, ...props }, ref) => (
   <SelectPrimitive.Trigger
@@ -30,7 +30,7 @@ const SelectTrigger = React.forwardRef<
 SelectTrigger.displayName = SelectPrimitive.Trigger.displayName;
 
 const SelectScrollUpButton = React.forwardRef<
-  React.ElementRef<typeof SelectPrimitive.ScrollUpButton>,
+  React.ComponentRef<typeof SelectPrimitive.ScrollUpButton>,
   React.ComponentPropsWithoutRef<typeof SelectPrimitive.ScrollUpButton>
 >(({ className, ...props }, ref) => (
   <SelectPrimitive.ScrollUpButton
@@ -44,7 +44,7 @@ const SelectScrollUpButton = React.forwardRef<
 SelectScrollUpButton.displayName = SelectPrimitive.ScrollUpButton.displayName;
 
 const SelectScrollDownButton = React.forwardRef<
-  React.ElementRef<typeof SelectPrimitive.ScrollDownButton>,
+  React.ComponentRef<typeof SelectPrimitive.ScrollDownButton>,
   React.ComponentPropsWithoutRef<typeof SelectPrimitive.ScrollDownButton>
 >(({ className, ...props }, ref) => (
   <SelectPrimitive.ScrollDownButton
@@ -58,7 +58,7 @@ const SelectScrollDownButton = React.forwardRef<
 SelectScrollDownButton.displayName = SelectPrimitive.ScrollDownButton.displayName;
 
 const SelectContent = React.forwardRef<
-  React.ElementRef<typeof SelectPrimitive.Content>,
+  React.ComponentRef<typeof SelectPrimitive.Content>,
   React.ComponentPropsWithoutRef<typeof SelectPrimitive.Content>
 >(({ className, children, position = 'popper', ...props }, ref) => (
   <SelectPrimitive.Portal>
@@ -90,7 +90,7 @@ const SelectContent = React.forwardRef<
 SelectContent.displayName = SelectPrimitive.Content.displayName;
 
 const SelectLabel = React.forwardRef<
-  React.ElementRef<typeof SelectPrimitive.Label>,
+  React.ComponentRef<typeof SelectPrimitive.Label>,
   React.ComponentPropsWithoutRef<typeof SelectPrimitive.Label>
 >(({ className, ...props }, ref) => (
   <SelectPrimitive.Label
@@ -102,7 +102,7 @@ const SelectLabel = React.forwardRef<
 SelectLabel.displayName = SelectPrimitive.Label.displayName;
 
 const SelectItem = React.forwardRef<
-  React.ElementRef<typeof SelectPrimitive.Item>,
+  React.ComponentRef<typeof SelectPrimitive.Item>,
   React.ComponentPropsWithoutRef<typeof SelectPrimitive.Item>
 >(({ className, children, ...props }, ref) => (
   <SelectPrimitive.Item
@@ -124,27 +124,4 @@ const SelectItem = React.forwardRef<
 ));
 SelectItem.displayName = SelectPrimitive.Item.displayName;
 
-const SelectSeparator = React.forwardRef<
-  React.ElementRef<typeof SelectPrimitive.Separator>,
-  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Separator>
->(({ className, ...props }, ref) => (
-  <SelectPrimitive.Separator
-    ref={ref}
-    className={cn('-mx-1 my-1 h-px bg-muted', className)}
-    {...props}
-  />
-));
-SelectSeparator.displayName = SelectPrimitive.Separator.displayName;
-
-export {
-  Select,
-  SelectGroup,
-  SelectValue,
-  SelectTrigger,
-  SelectContent,
-  SelectLabel,
-  SelectItem,
-  SelectSeparator,
-  SelectScrollUpButton,
-  SelectScrollDownButton,
-};
+export { Select, SelectGroup, SelectValue, SelectTrigger, SelectContent, SelectLabel, SelectItem };

src/components/ui/switch.tsx

@@ -4,7 +4,7 @@ import * as SwitchPrimitives from '@radix-ui/react-switch';
 import { cn } from '@/lib/utils';
 
 const Switch = React.forwardRef<
-  React.ElementRef<typeof SwitchPrimitives.Root>,
+  React.ComponentRef<typeof SwitchPrimitives.Root>,
   React.ComponentPropsWithoutRef<typeof SwitchPrimitives.Root>
 >(({ className, ...props }, ref) => (
   <SwitchPrimitives.Root

src/hooks/useMediaQuery.ts

@@ -0,0 +1,25 @@
+import { useCallback, useSyncExternalStore } from 'react';
+
+/**
+ * 监听媒体查询，返回是否匹配。
+ * 用于在窄屏（popup/sidepanel）与宽屏（tab）间切换布局。
+ */
+export function useMediaQuery(query: string): boolean {
+  const subscribe = useCallback(
+    (onChange: () => void) => {
+      if (typeof window === 'undefined' || !window.matchMedia) return () => {};
+      const mql = window.matchMedia(query);
+      mql.addEventListener('change', onChange);
+      return () => mql.removeEventListener('change', onChange);
+    },
+    [query],
+  );
+
+  const getSnapshot = useCallback(
+    () =>
+      typeof window !== 'undefined' && window.matchMedia ? window.matchMedia(query).matches : false,
+    [query],
+  );
+
+  return useSyncExternalStore(subscribe, getSnapshot, () => false);
+}

src/lib/utils.ts

@@ -1,5 +1,6 @@
 import { type ClassValue, clsx } from 'clsx';
+import { twMerge } from 'tailwind-merge';
 
 export function cn(...inputs: ClassValue[]) {
-  return clsx(inputs);
+  return twMerge(clsx(inputs));
 }

src/pages/JsonTools/__tests__/index.test.tsx

@@ -1,10 +1,43 @@
 import { render, screen } from '@testing-library/react';
-import { describe, it, expect } from 'vitest';
+import { describe, it, expect, vi, beforeEach } from 'vitest';
 import Index from '../index';
 
+const setWide = (wide: boolean) => {
+  window.matchMedia = vi.fn().mockImplementation((query: string) => ({
+    matches: wide,
+    media: query,
+    onchange: null,
+    addListener: vi.fn(),
+    removeListener: vi.fn(),
+    addEventListener: vi.fn(),
+    removeEventListener: vi.fn(),
+    dispatchEvent: vi.fn(),
+  }));
+};
+
 describe('JsonTools 页面', () => {
+  beforeEach(() => {
+    // 默认窄屏（matches:false）
+    setWide(false);
+  });
+
   it('应该渲染模式切换按钮', () => {
     render(<Index />);
     expect(screen.getAllByRole('button').length).toBeGreaterThan(0);
   });
+
+  it('窄屏渲染 A/B 数据面板与 Compare 按钮', () => {
+    setWide(false);
+    render(<Index />);
+    expect(screen.getByText('数据 A（原始）')).toBeInTheDocument();
+    expect(screen.getByText('数据 B（目标）')).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: /Compare A & B/i })).toBeInTheDocument();
+  });
+
+  it('宽屏渲染原始/目标 JSON 标签', () => {
+    setWide(true);
+    render(<Index />);
+    expect(screen.getByText('原始 JSON')).toBeInTheDocument();
+    expect(screen.getByText('目标 JSON')).toBeInTheDocument();
+  });
 });

src/pages/JsonTools/__tests__/useJsonTools.test.ts

@@ -0,0 +1,78 @@
+import { renderHook, act } from '@testing-library/react';
+import { describe, it, expect } from 'vitest';
+import { useJsonTools } from '../useJsonTools';
+
+describe('useJsonTools 窄屏手动比对', () => {
+  it('canCompare 在两侧输入合法前为 false', () => {
+    const { result } = renderHook(() => useJsonTools());
+    expect(result.current.canCompare).toBe(false);
+
+    act(() => result.current.setLeftInput('{"a":1}'));
+    expect(result.current.canCompare).toBe(false);
+
+    act(() => result.current.setRightInput('{"b":2}'));
+    expect(result.current.canCompare).toBe(true);
+  });
+
+  it('非法 JSON 时 canCompare 为 false', () => {
+    const { result } = renderHook(() => useJsonTools());
+    act(() => {
+      result.current.setLeftInput('{"a":1}');
+      result.current.setRightInput('not json');
+    });
+    expect(result.current.canCompare).toBe(false);
+  });
+
+  it('handleCompare 生成结果并自动折叠两侧面板', () => {
+    const { result } = renderHook(() => useJsonTools());
+    act(() => {
+      result.current.setLeftInput('{"a":1}');
+      result.current.setRightInput('{"a":2}');
+    });
+    act(() => result.current.handleCompare());
+
+    expect(result.current.hasCompared).toBe(true);
+    expect(result.current.activeResult).not.toBeNull();
+    expect(result.current.total).toBeGreaterThan(0);
+    expect(result.current.collapsedA).toBe(true);
+    expect(result.current.collapsedB).toBe(true);
+  });
+
+  it('比对后修改输入会重置结果，但保留折叠态', () => {
+    const { result } = renderHook(() => useJsonTools());
+    act(() => {
+      result.current.setLeftInput('{"a":1}');
+      result.current.setRightInput('{"a":2}');
+    });
+    act(() => result.current.handleCompare());
+    expect(result.current.hasCompared).toBe(true);
+    expect(result.current.collapsedA).toBe(true);
+    expect(result.current.collapsedB).toBe(true);
+
+    act(() => result.current.setLeftInput('{"a":3}'));
+    expect(result.current.hasCompared).toBe(false);
+    expect(result.current.activeResult).toBeNull();
+    expect(result.current.collapsedA).toBe(true);
+    expect(result.current.collapsedB).toBe(true);
+  });
+
+  it('toggleCollapseA/B 可逆切换折叠态', () => {
+    const { result } = renderHook(() => useJsonTools());
+    expect(result.current.collapsedA).toBe(false);
+    act(() => result.current.toggleCollapseA());
+    expect(result.current.collapsedA).toBe(true);
+    act(() => result.current.toggleCollapseA());
+    expect(result.current.collapsedA).toBe(false);
+  });
+
+  it('单输入经防抖后持久化，重挂载可恢复', async () => {
+    localStorage.clear();
+    const { result, unmount } = renderHook(() => useJsonTools());
+    act(() => result.current.setInput('{"x":1}'));
+    await new Promise((r) => setTimeout(r, 300));
+    unmount();
+
+    const { result: result2 } = renderHook(() => useJsonTools());
+    expect(result2.current.input).toBe('{"x":1}');
+  });
+});

src/pages/JsonTools/components/CollapsiblePanel.tsx

@@ -0,0 +1,72 @@
+import React from 'react';
+import { ChevronRight } from 'lucide-react';
+import { cn } from '@/lib/utils';
+
+export interface CollapsiblePanelProps extends Omit<React.HTMLAttributes<HTMLDivElement>, 'title'> {
+  /** 面板标题 */
+  title: string;
+  /** 是否处于折叠态 */
+  collapsed: boolean;
+  onToggleCollapse: () => void;
+  /** 折叠态展示的单行缩略预览文本 */
+  preview?: string;
+  /** 展开态内容 */
+  children?: React.ReactNode;
+}
+
+export default function CollapsiblePanel({
+  title,
+  collapsed,
+  onToggleCollapse,
+  preview,
+  children,
+  className,
+  ...props
+}: CollapsiblePanelProps) {
+  return (
+    <div
+      className={cn(
+        'flex flex-col overflow-hidden rounded-md border bg-card transition-all duration-300 ease-in-out',
+        className,
+      )}
+      style={{
+        flex: collapsed ? '0 0 36px' : '1 1 120px',
+      }}
+      {...props}
+    >
+      <button
+        type="button"
+        onClick={onToggleCollapse}
+        className={cn(
+          'flex h-[36px] w-full cursor-pointer select-none items-center justify-between bg-muted/20 hover:bg-muted/30 transition-colors px-3 shrink-0 text-left focus:outline-none focus:bg-muted/40',
+          !collapsed && 'border-b border-border/60',
+        )}
+      >
+        <span className="text-[11px] font-semibold text-foreground/90 shrink-0">{title}</span>
+        <span
+          className={cn(
+            'flex-1 truncate font-mono text-xs text-muted-foreground/70 ml-3 transition-all duration-300',
+            collapsed ? 'opacity-100 max-w-full' : 'opacity-0 max-w-0 pointer-events-none',
+          )}
+        >
+          {preview}
+        </span>
+        <ChevronRight
+          className={cn(
+            'h-4 w-4 shrink-0 text-muted-foreground hover:text-foreground transition-transform duration-300',
+            !collapsed && 'rotate-90',
+          )}
+        />
+      </button>
+
+      <div
+        className={cn(
+          'flex-1 min-h-0 flex flex-col transition-opacity duration-300',
+          collapsed ? 'opacity-0 pointer-events-none' : 'opacity-100',
+        )}
+      >
+        {children}
+      </div>
+    </div>
+  );
+}

src/pages/JsonTools/components/CompareActionBar.tsx

@@ -0,0 +1,72 @@
+import React from 'react';
+import { ArrowLeftRight } from 'lucide-react';
+import DiffNavigator from './DiffNavigator';
+import { cn } from '@/lib/utils';
+
+export interface CompareActionBarProps extends React.HTMLAttributes<HTMLDivElement> {
+  canCompare: boolean;
+  onCompare: () => void;
+  hasCompared: boolean;
+  total: number;
+  currentIndex: number;
+  onPrev: () => void;
+  onNext: () => void;
+  resultsVisible?: boolean;
+  onShowResults?: () => void;
+}
+
+export default function CompareActionBar({
+  canCompare,
+  onCompare,
+  hasCompared,
+  total,
+  currentIndex,
+  onPrev,
+  onNext,
+  resultsVisible = true,
+  onShowResults,
+  className,
+  ...props
+}: CompareActionBarProps) {
+  return (
+    <div className={cn('flex shrink-0 items-center justify-center py-0.5', className)} {...props}>
+      {hasCompared ? (
+        resultsVisible ? (
+          <DiffNavigator
+            total={total}
+            currentIndex={currentIndex}
+            onPrev={onPrev}
+            onNext={onNext}
+          />
+        ) : (
+          <button
+            type="button"
+            onClick={onShowResults}
+            className={cn(
+              'inline-flex h-8 items-center gap-1.5 rounded-md px-3 text-xs font-semibold transition-colors bg-primary text-primary-foreground hover:bg-primary/90',
+            )}
+          >
+            <ArrowLeftRight className="h-3.5 w-3.5" />
+            查看对比结果
+          </button>
+        )
+      ) : (
+        <button
+          type="button"
+          disabled={!canCompare}
+          onClick={onCompare}
+          className={cn(
+            'inline-flex h-8 items-center gap-1.5 rounded-md px-3 text-xs font-semibold transition-colors',
+            'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-1 focus-visible:ring-offset-muted',
+            canCompare
+              ? 'bg-primary text-primary-foreground hover:bg-primary/90'
+              : 'cursor-not-allowed bg-muted text-muted-foreground',
+          )}
+        >
+          <ArrowLeftRight className="h-3.5 w-3.5" />
+          Compare A &amp; B
+        </button>
+      )}
+    </div>
+  );
+}

src/pages/JsonTools/components/DiffResult.tsx

@@ -7,28 +7,99 @@ export interface DiffResultProps extends React.HTMLAttributes<HTMLDivElement> {
   result: DiffResultType;
   viewMode: ViewMode;
   activePath?: string;
+  /** 窄屏填充模式：撑满父容器可用高度并内部滚动，而非使用固定最小/最大高度 */
+  fill?: boolean;
 }
 
 export default function DiffResult({
   result,
   viewMode,
   activePath,
+  fill = false,
   className,
   ...props
 }: DiffResultProps) {
+  const [expandedPaths, setExpandedPaths] = React.useState<Record<string, 'open' | 'closed'>>({});
+  const togglePath = React.useCallback((path: string, currentExpanded: boolean) => {
+    setExpandedPaths((prev) => ({
+      ...prev,
+      [path]: currentExpanded ? 'closed' : 'open',
+    }));
+  }, []);
+
+  const leftRef = React.useRef<HTMLDivElement | null>(null);
+  const rightRef = React.useRef<HTMLDivElement | null>(null);
+
+  React.useEffect(() => {
+    const leftEl = leftRef.current;
+    const rightEl = rightRef.current;
+    if (!leftEl || !rightEl) return;
+
+    let isSyncingLeftScroll = false;
+    let isSyncingRightScroll = false;
+
+    const handleLeftScroll = () => {
+      if (isSyncingLeftScroll) {
+        isSyncingLeftScroll = false;
+        return;
+      }
+      isSyncingRightScroll = true;
+      rightEl.scrollTop = leftEl.scrollTop;
+      rightEl.scrollLeft = leftEl.scrollLeft;
+    };
+
+    const handleRightScroll = () => {
+      if (isSyncingRightScroll) {
+        isSyncingRightScroll = false;
+        return;
+      }
+      isSyncingLeftScroll = true;
+      leftEl.scrollTop = rightEl.scrollTop;
+      leftEl.scrollLeft = rightEl.scrollLeft;
+    };
+
+    leftEl.addEventListener('scroll', handleLeftScroll);
+    rightEl.addEventListener('scroll', handleRightScroll);
+
+    return () => {
+      leftEl.removeEventListener('scroll', handleLeftScroll);
+      rightEl.removeEventListener('scroll', handleRightScroll);
+    };
+  }, [viewMode]);
+
   if (viewMode === 'sideBySide') {
     return (
       <div
-        className={cn('flex flex-col md:flex-row gap-4 items-stretch w-full', className)}
+        className={cn(
+          'flex flex-col md:flex-row gap-4 items-stretch rounded-xl border border-border bg-muted/30 p-1.5 w-full',
+          fill ? 'min-h-0 flex-1' : '',
+          className,
+        )}
         {...props}
       >
-        <div className="flex-1 min-w-0">
+        <div className="flex-1 min-w-0 min-h-0 flex flex-col">
           <SectionLabel text="原始 JSON" />
-          <JsonTree node={result.root} side="left" activePath={activePath} />
+          <JsonTree
+            ref={leftRef}
+            node={result.root}
+            side="left"
+            activePath={activePath}
+            fill={fill}
+            expandedPaths={expandedPaths}
+            onTogglePath={togglePath}
+          />
         </div>
-        <div className="flex-1 min-w-0">
+        <div className="flex-1 min-w-0 min-h-0 flex flex-col">
           <SectionLabel text="目标 JSON" />
-          <JsonTree node={result.root} side="right" activePath={activePath} />
+          <JsonTree
+            ref={rightRef}
+            node={result.root}
+            side="right"
+            activePath={activePath}
+            fill={fill}
+            expandedPaths={expandedPaths}
+            onTogglePath={togglePath}
+          />
         </div>
       </div>
     );
@@ -37,13 +108,16 @@ export default function DiffResult({
   return (
     <div
       className={cn(
-        'rounded-xl border border-border bg-card font-mono text-xs shadow-sm overflow-x-auto min-h-[200px] max-h-[520px] overflow-y-auto p-1.5',
+        'flex flex-col rounded-xl border border-border bg-muted/30 font-mono text-xs shadow-sm overflow-x-auto overflow-y-auto p-1.5',
+        fill ? 'min-h-0 flex-1' : 'min-h-[200px] max-h-[520px]',
         className,
       )}
       {...props}
     >
+      <div className="min-w-full w-fit">
         <UnifiedView node={result.root} depth={0} activePath={activePath} />
       </div>
+    </div>
   );
 }
 
@@ -189,7 +263,7 @@ const UnifiedRow = ({ depth, type, text, active, multiline }: UnifiedRowProps) =
         currentTheme.bg,
         currentTheme.text,
         active &&
-          'bg-primary/10 relative before:absolute before:left-0 before:top-0 before:bottom-0 before:w-1 before:bg-blue-500',
+          'bg-primary/10 relative before:absolute before:left-0 before:top-0 before:bottom-0 before:w-1 before:bg-blue-500 before:content-[""]',
       )}
       style={{
         paddingLeft: `${Math.max(0.5, depth * 1.25)}rem`,

src/pages/JsonTools/components/DiffWorkspace.tsx

@@ -0,0 +1,154 @@
+import JsonDiffInput from './JsonDiffInput';
+import JsonDiffPanel from './JsonDiffPanel';
+import CompareActionBar from './CompareActionBar';
+import DiffResult from './DiffResult';
+import DiffNavigator from './DiffNavigator';
+import SwitchButtonGroup from '@/components/SwitchButtonGroup';
+import EmptyPlaceholder from '@/components/EmptyPlaceholder';
+import type { UseJsonToolsReturn } from '../useJsonTools';
+import type { ViewMode } from '../types';
+
+interface DiffWorkspaceProps {
+  tools: UseJsonToolsReturn;
+}
+
+const VIEW_OPTIONS: { value: ViewMode; label: string }[] = [
+  { value: 'sideBySide', label: '并排' },
+  { value: 'unified', label: '统一' },
+];
+
+export default function DiffWorkspace({ tools }: DiffWorkspaceProps) {
+  const {
+    isWide,
+    viewMode,
+    setViewMode,
+    leftInput,
+    rightInput,
+    setLeftInput,
+    setRightInput,
+    leftError,
+    rightError,
+    activeResult,
+    total,
+    currentDiffIndex,
+    handlePrev,
+    handleNext,
+    activePath,
+    hasCompared,
+    collapsedA,
+    collapsedB,
+    toggleCollapseA,
+    toggleCollapseB,
+    canCompare,
+    handleCompare,
+    previewA,
+    previewB,
+  } = tools;
+
+  const viewToggle = (
+    <div className="flex h-10 items-center justify-between rounded-xl border border-border/60 bg-secondary/40 px-1.5">
+      <SwitchButtonGroup
+        value={viewMode}
+        onChange={(v: ViewMode) => setViewMode(v)}
+        options={VIEW_OPTIONS}
+        size="small"
+      />
+    </div>
+  );
+
+  if (isWide) {
+    return (
+      <div className="flex flex-1 min-h-0 flex-col space-y-4">
+        {viewToggle}
+
+        <div className="flex w-full flex-col items-stretch gap-4 md:flex-row shrink-0">
+          <JsonDiffInput
+            label="原始 JSON"
+            placeholder="输入原始 JSON..."
+            value={leftInput}
+            onChange={setLeftInput}
+            error={leftError}
+            minRows={9}
+          />
+          <JsonDiffInput
+            label="目标 JSON"
+            placeholder="输入目标 JSON..."
+            value={rightInput}
+            onChange={setRightInput}
+            error={rightError}
+            minRows={9}
+          />
+        </div>
+
+        {activeResult ? (
+          <div className="flex min-h-0 flex-1 flex-col space-y-3.5 pt-1">
+            <div className="flex w-full justify-center shrink-0">
+              <DiffNavigator
+                total={total}
+                currentIndex={currentDiffIndex}
+                onPrev={handlePrev}
+                onNext={handleNext}
+              />
+            </div>
+            <DiffResult result={activeResult} viewMode={viewMode} activePath={activePath} fill />
+          </div>
+        ) : (
+          <EmptyPlaceholder className="min-h-[140px] flex-1" messageClassName="max-w-[260px]">
+            {leftError || rightError
+              ? '请修正上方 JSON 的语法错误以开启实时流式比对'
+              : '输入两侧 JSON 后点击比较'}
+          </EmptyPlaceholder>
+        )}
+      </div>
+    );
+  }
+
+  const resultsVisible = collapsedA && collapsedB;
+
+  const handleShowResults = () => {
+    if (!collapsedA) toggleCollapseA();
+    if (!collapsedB) toggleCollapseB();
+  };
+
+  return (
+    <div className="flex flex-1 min-h-0 flex-col gap-3">
+      <JsonDiffPanel
+        title="数据 A（原始）"
+        placeholder="输入原始 JSON..."
+        value={leftInput}
+        onChange={setLeftInput}
+        error={leftError}
+        collapsed={collapsedA}
+        onToggleCollapse={toggleCollapseA}
+        preview={previewA}
+      />
+      <CompareActionBar
+        canCompare={canCompare}
+        onCompare={handleCompare}
+        hasCompared={hasCompared}
+        total={total}
+        currentIndex={currentDiffIndex}
+        onPrev={handlePrev}
+        onNext={handleNext}
+        resultsVisible={resultsVisible}
+        onShowResults={handleShowResults}
+      />
+      <JsonDiffPanel
+        title="数据 B（目标）"
+        placeholder="输入目标 JSON..."
+        value={rightInput}
+        onChange={setRightInput}
+        error={rightError}
+        collapsed={collapsedB}
+        onToggleCollapse={toggleCollapseB}
+        preview={previewB}
+      />
+
+      {activeResult && resultsVisible ? (
+        <div className="flex min-h-0 flex-1">
+          <DiffResult result={activeResult} viewMode={viewMode} activePath={activePath} fill />
+        </div>
+      ) : null}
+    </div>
+  );
+}

src/pages/JsonTools/components/JsonConvertSection.tsx

@@ -1,55 +1,45 @@
-import React, { useEffect, useMemo, useState } from 'react';
-import EmptyPlaceholder from '@/components/EmptyPlaceholder';
+import React, { useMemo } from 'react';
 import TextInputArea from '@/components/TextInputArea';
 import JsonResultPanel from './JsonResultPanel';
+import CollapsiblePanel from './CollapsiblePanel';
 import { validateJson } from '@/utils/jsonFormatter';
 import { cn } from '@/lib/utils';
+import { buildPreview, type UseJsonToolsReturn } from '../useJsonTools';
 import type { ConvertFunction, ConvertResult } from '../types';
 
-const CONVERT_LABELS: Record<
-  string,
-  { inputPlaceholder: string; outputLabel: string; emptyHint: string }
-> = {
+const CONVERT_LABELS: Record<string, { inputPlaceholder: string; outputLabel: string }> = {
   yaml: {
     inputPlaceholder: '输入需要转换的 JSON...',
     outputLabel: 'YAML 结果',
-    emptyHint: '输入 JSON 后点击转换',
   },
   toml: {
     inputPlaceholder: '输入需要转换的 JSON...',
     outputLabel: 'TOML 结果',
-    emptyHint: '输入 JSON 后点击转换',
   },
   minify: {
     inputPlaceholder: '输入需要压缩的 JSON...',
     outputLabel: '压缩结果',
-    emptyHint: '输入 JSON 后点击压缩',
   },
 };
 
 interface JsonConvertSectionProps extends React.HTMLAttributes<HTMLDivElement> {
+  tools: UseJsonToolsReturn;
   mode: string;
   convertFunction: ConvertFunction;
 }
 
 export default function JsonConvertSection({
+  tools,
   mode,
   convertFunction,
   className,
   ...props
 }: JsonConvertSectionProps) {
-  const [input, setInput] = useState('');
-  const [debouncedInput, setDebouncedInput] = useState('');
+  const { input, setInput, debouncedInput } = tools;
+  const [inputCollapsed, setInputCollapsed] = useState(false);
 
   const labels = CONVERT_LABELS[mode] ?? CONVERT_LABELS.yaml;
 
-  useEffect(() => {
-    const handle = setTimeout(() => {
-      setDebouncedInput(input);
-    }, 250);
-    return () => clearTimeout(handle);
-  }, [input]);
-
   const error = useMemo(() => {
     return validateJson(debouncedInput);
   }, [debouncedInput]);
@@ -71,32 +61,40 @@ export default function JsonConvertSection({
     }
   }, [debouncedInput, error, convertFunction]);
 
+  const preview = useMemo(() => buildPreview(input), [input]);
+
   return (
-    <div className={cn('w-full flex flex-col gap-4', className)} {...props}>
+    <div className={cn('w-full flex flex-1 min-h-0 flex-col gap-3', className)} {...props}>
+      <CollapsiblePanel
+        title="JSON 输入"
+        collapsed={inputCollapsed}
+        onToggleCollapse={() => setInputCollapsed((v) => !v)}
+        preview={preview}
+      >
         <TextInputArea
+          fill
+          borderless
           placeholder={labels.inputPlaceholder}
           value={input}
           onChange={setInput}
           externalError={error || runtimeError || undefined}
           showClear={true}
           allowCopy={true}
-        minRows={7}
-        maxRows={14}
+          className="min-h-0 flex-1"
           onClear={() => setInput('')}
         />
+      </CollapsiblePanel>
 
-      {result?.output ? (
+      {result?.output && (
+        <div className="flex min-h-0 flex-1">
           <JsonResultPanel
+            fill
             title={labels.outputLabel}
             content={result.output}
             originalBytes={result.originalBytes}
             outputBytes={result.outputBytes}
-          maxHeight="380px"
           />
-      ) : (
-        <EmptyPlaceholder>
-          {error ? '请修正上方 JSON 的语法错误以开启实时流式格式化' : labels.emptyHint}
-        </EmptyPlaceholder>
+        </div>
       )}
     </div>
   );

src/pages/JsonTools/components/JsonDiffPanel.tsx

@@ -0,0 +1,59 @@
+import React from 'react';
+import TextInputArea from '@/components/TextInputArea';
+import CollapsiblePanel from './CollapsiblePanel';
+import { cn } from '@/lib/utils';
+
+export interface JsonDiffPanelProps extends Omit<React.HTMLAttributes<HTMLDivElement>, 'onChange'> {
+  /** 面板标题，如 "数据 A（原始）" */
+  title: string;
+  placeholder: string;
+  value: string;
+  onChange: (value: string) => void;
+  error?: string | null;
+  /** 是否处于折叠态 */
+  collapsed: boolean;
+  onToggleCollapse: () => void;
+  /** 折叠态展示的单行缩略预览文本 */
+  preview: string;
+}
+
+export default function JsonDiffPanel({
+  title,
+  placeholder,
+  value,
+  onChange,
+  error,
+  collapsed,
+  onToggleCollapse,
+  preview,
+  className,
+  ...props
+}: JsonDiffPanelProps) {
+  return (
+    <CollapsiblePanel
+      title={title}
+      collapsed={collapsed}
+      onToggleCollapse={onToggleCollapse}
+      preview={preview}
+      className={cn(
+        error
+          ? 'border-destructive focus-within:ring-1 focus-within:ring-destructive focus-within:border-destructive'
+          : 'border-border focus-within:ring-1 focus-within:ring-ring focus-within:border-border/80',
+        className,
+      )}
+      {...props}
+    >
+      <TextInputArea
+        fill
+        value={value}
+        onChange={onChange}
+        placeholder={placeholder}
+        externalError={error ?? undefined}
+        showClear={true}
+        allowCopy={true}
+        borderless
+        className="min-h-0 flex-1"
+      />
+    </CollapsiblePanel>
+  );
+}

src/pages/JsonTools/components/JsonFormatSection.tsx

@@ -1,29 +1,27 @@
-import { useEffect, useMemo, useState } from 'react';
+import { useMemo, useState } from 'react';
 import {
   formatJson,
   type JsonFormatOptions,
   type JsonFormatResult,
   validateJson,
 } from '@/utils/jsonFormatter';
-import EmptyPlaceholder from '@/components/EmptyPlaceholder';
 import SwitchButtonGroup from '@/components/SwitchButtonGroup';
 import TextInputArea from '@/components/TextInputArea';
+import CollapsiblePanel from './CollapsiblePanel';
 import JsonResultPanel from './JsonResultPanel';
 import { Checkbox } from '@/components/ui/checkbox';
 import { Label } from '@/components/ui/label';
+import { buildPreview, type UseJsonToolsReturn } from '../useJsonTools';
 
-export default function JsonFormatSection() {
-  const [input, setInput] = useState('');
-  const [debouncedInput, setDebouncedInput] = useState('');
+interface JsonFormatSectionProps {
+  tools: UseJsonToolsReturn;
+}
+
+export default function JsonFormatSection({ tools }: JsonFormatSectionProps) {
+  const { input, setInput, debouncedInput } = tools;
   const [indentSize, setIndentSize] = useState<number>(2);
   const [sortKeys, setSortKeys] = useState(false);
-
-  useEffect(() => {
-    const handle = setTimeout(() => {
-      setDebouncedInput(input);
-    }, 250);
-    return () => clearTimeout(handle);
-  }, [input]);
+  const [inputCollapsed, setInputCollapsed] = useState(false);
 
   const error = useMemo(() => {
     return validateJson(debouncedInput);
@@ -47,9 +45,11 @@ export default function JsonFormatSection() {
     }
   }, [debouncedInput, error, indentSize, sortKeys]);
 
+  const preview = useMemo(() => buildPreview(input), [input]);
+
   return (
-    <div className="w-full flex flex-col gap-4">
-      <div className="flex h-10 items-center justify-between px-1.5 bg-secondary/40 rounded-xl border border-border/60">
+    <div className="w-full flex flex-1 min-h-0 flex-col gap-3">
+      <div className="flex h-10 items-center justify-between px-1.5 bg-secondary/40 rounded-xl border border-border/60 shrink-0">
         <div className="flex gap-4 items-center w-full">
           <div className="flex gap-2 items-center shrink-0 select-none">
             <span className="text-[10px] font-bold text-muted-foreground/90 uppercase tracking-wider">
@@ -57,7 +57,7 @@ export default function JsonFormatSection() {
             </span>
             <SwitchButtonGroup
               value={indentSize}
-              onChange={(v) => setIndentSize(Number(v))}
+              onChange={(v: number) => setIndentSize(Number(v))}
               options={[2, 4, 6, 8].map((size) => ({ value: size, label: String(size) }))}
               size="small"
             />
@@ -86,29 +86,36 @@ export default function JsonFormatSection() {
         </div>
       </div>
 
+      <CollapsiblePanel
+        title="JSON 输入"
+        collapsed={inputCollapsed}
+        onToggleCollapse={() => setInputCollapsed((v) => !v)}
+        preview={preview}
+      >
         <TextInputArea
+          fill
+          borderless
           placeholder="输入需要格式化的 JSON..."
           value={input}
           onChange={setInput}
           externalError={error || runtimeError || undefined}
           showClear={true}
           allowCopy={true}
-        minRows={8}
-        maxRows={15}
+          className="min-h-0 flex-1"
           onClear={() => setInput('')}
         />
+      </CollapsiblePanel>
 
-      {result?.formatted ? (
+      {result?.formatted && (
+        <div className="flex min-h-0 flex-1">
           <JsonResultPanel
+            fill
             title="格式化结果"
             content={result.formatted}
             originalBytes={result.originalBytes}
             outputBytes={result.formattedBytes}
           />
-      ) : (
-        <EmptyPlaceholder>
-          {error ? '请修正上方 JSON 的语法错误以开启实时流式格式化' : '输入 JSON 后点击格式化'}
-        </EmptyPlaceholder>
+        </div>
       )}
     </div>
   );

src/pages/JsonTools/components/JsonResultPanel.tsx

@@ -1,5 +1,6 @@
 import { formatBytes } from '@/utils/format';
 import { CopyButton } from '@/components/CopyButton';
+import { cn } from '@/lib/utils';
 
 export interface JsonResultPanelProps {
   title: string;
@@ -8,6 +9,11 @@ export interface JsonResultPanelProps {
   outputBytes: number;
   outputSizeLabel?: string;
   maxHeight?: string;
+  /**
+   * 撑满父容器剩余高度并启用内部滚动（而非按 maxHeight 截断）。
+   * 用于 popup / sidepanel 等固定高度场景下与折叠输入面板共享垂直空间。
+   */
+  fill?: boolean;
 }
 
 export default function JsonResultPanel({
@@ -17,9 +23,15 @@ export default function JsonResultPanel({
   outputBytes,
   outputSizeLabel = '格式化后大小',
   maxHeight = '420px',
+  fill = false,
 }: JsonResultPanelProps) {
   return (
-    <div className="relative rounded-xl border border-border bg-card text-card-foreground shadow-sm overflow-hidden">
+    <div
+      className={cn(
+        'relative rounded-xl border border-border bg-card text-card-foreground shadow-sm overflow-hidden',
+        fill ? 'flex flex-col flex-1 min-h-0' : 'flex flex-col',
+      )}
+    >
       <div className="flex h-9 items-center justify-between px-4 border-b border-border bg-muted/50 select-none">
         <div className="flex gap-4 items-center">
           <span className="text-[10px] font-bold uppercase tracking-wider text-muted-foreground/90">
@@ -43,8 +55,11 @@ export default function JsonResultPanel({
       </div>
 
       <div
-        className="p-4 font-mono text-xs text-foreground/90 whitespace-pre-wrap break-all overflow-y-auto leading-relaxed select-text"
-        style={{ maxHeight }}
+        className={cn(
+          'p-4 font-mono text-xs text-foreground/90 whitespace-pre-wrap break-all overflow-y-auto leading-relaxed select-text',
+          fill && 'flex-1 min-h-0',
+        )}
+        style={fill ? undefined : { maxHeight }}
       >
         {content}
       </div>

src/pages/JsonTools/components/JsonTree.tsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useMemo, useRef, useState } from 'react';
+import React, { useEffect, useMemo, useRef } from 'react';
 import { ChevronDown, ChevronRight } from 'lucide-react';
 import type { DiffNode, DiffType } from '../types';
 import { cn } from '@/lib/utils';
@@ -10,6 +10,9 @@ export interface JsonTreeProps extends React.HTMLAttributes<HTMLDivElement> {
   side: TreeSide;
   defaultExpandDepth?: number;
   activePath?: string;
+  fill?: boolean;
+  expandedPaths?: Record<string, 'open' | 'closed'>;
+  onTogglePath?: (path: string, currentExpanded: boolean) => void;
 }
 
 interface NodeRowProps {
@@ -19,6 +22,8 @@ interface NodeRowProps {
   defaultExpandDepth: number;
   activePath?: string;
   isLastChild: boolean;
+  expandedPaths?: Record<string, 'open' | 'closed'>;
+  onTogglePath?: (path: string, currentExpanded: boolean) => void;
 }
 
 const formatPrimitive = (v: unknown): string => {
@@ -62,8 +67,17 @@ const isContainerValue = (v: unknown): boolean => {
 };
 
 const NodeRow = React.memo(
-  ({ node, side, depth, defaultExpandDepth, activePath, isLastChild }: NodeRowProps) => {
-    const [override, setOverride] = useState<'auto' | 'open' | 'closed'>('auto');
+  ({
+    node,
+    side,
+    depth,
+    defaultExpandDepth,
+    activePath,
+    isLastChild,
+    expandedPaths = {},
+    onTogglePath,
+  }: NodeRowProps) => {
+    const override = expandedPaths[node.path] || 'auto';
     const rowRef = useRef<HTMLDivElement | null>(null);
 
     const onActivePath = useMemo(() => {
@@ -123,7 +137,7 @@ const NodeRow = React.memo(
       return (
         <div ref={rowRef} className="w-full flex flex-col">
           <div
-            onClick={() => setOverride(expanded ? 'closed' : 'open')}
+            onClick={() => onTogglePath?.(node.path, expanded)}
             className={cn(
               'group flex items-center gap-1 py-0.5 pr-2 text-xs font-mono select-none cursor-pointer rounded-sm w-full h-[22px] leading-relaxed',
               theme.bg,
@@ -171,6 +185,8 @@ const NodeRow = React.memo(
                   defaultExpandDepth={defaultExpandDepth}
                   activePath={activePath}
                   isLastChild={idx === node.children!.length - 1}
+                  expandedPaths={expandedPaths}
+                  onTogglePath={onTogglePath}
                 />
               ))}
             </div>
@@ -204,7 +220,7 @@ const NodeRow = React.memo(
         {!isRoot && (
           <span className="text-foreground/90 font-bold tracking-tight">{node.key}:</span>
         )}
-        <span className={cn('font-medium tracking-tight truncate flex-1', theme.text)}>
+        <span className={cn('font-medium tracking-tight whitespace-nowrap', theme.text)}>
           {formatPrimitive(value)}
           <span className="text-foreground/60 font-sans">{isLastChild ? '' : ','}</span>
         </span>
@@ -215,22 +231,32 @@ const NodeRow = React.memo(
 
 NodeRow.displayName = 'NodeRow';
 
-export default function JsonTree({
+const JsonTree = React.forwardRef<HTMLDivElement, JsonTreeProps>(
+  (
+    {
       node,
       side,
       defaultExpandDepth = 2,
       activePath,
+      fill = false,
+      expandedPaths,
+      onTogglePath,
       className,
       ...props
-}: JsonTreeProps) {
+    },
+    ref,
+  ) => {
     return (
       <div
+        ref={ref}
         className={cn(
-        'rounded-xl border border-border bg-card text-card-foreground font-mono text-xs shadow-sm overflow-x-auto min-h-[200px] max-h-[520px] overflow-y-auto p-2.5 tabular-nums select-text',
+          'rounded-xl border border-border bg-card text-card-foreground font-mono text-xs shadow-sm overflow-x-auto overflow-y-auto p-2.5 tabular-nums select-text',
+          fill ? 'min-h-0 flex-1' : 'min-h-[200px] max-h-[520px]',
           className,
         )}
         {...props}
       >
+        <div className="min-w-full w-fit">
           <NodeRow
             node={node}
             side={side}
@@ -238,10 +264,18 @@ export default function JsonTree({
             defaultExpandDepth={defaultExpandDepth}
             activePath={activePath}
             isLastChild
+            expandedPaths={expandedPaths}
+            onTogglePath={onTogglePath}
           />
         </div>
+      </div>
     );
-}
+  },
+);
+
+JsonTree.displayName = 'JsonTree';
+
+export default JsonTree;
 
 const summarize = (v: unknown): string => {
   if (Array.isArray(v)) return `${v.length} ${v.length === 1 ? 'item' : 'items'}`;

src/pages/JsonTools/components/__tests__/CompareActionBar.test.tsx

@@ -0,0 +1,56 @@
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { describe, it, expect, vi } from 'vitest';
+import CompareActionBar from '../CompareActionBar';
+
+describe('CompareActionBar', () => {
+  it('不可比较时按钮禁用', () => {
+    render(
+      <CompareActionBar
+        canCompare={false}
+        onCompare={() => {}}
+        hasCompared={false}
+        total={0}
+        currentIndex={0}
+        onPrev={() => {}}
+        onNext={() => {}}
+      />,
+    );
+    expect(screen.getByRole('button', { name: /Compare A & B/i })).toBeDisabled();
+  });
+
+  it('可比较时点击触发 onCompare', async () => {
+    const user = userEvent.setup();
+    const onCompare = vi.fn();
+    render(
+      <CompareActionBar
+        canCompare={true}
+        onCompare={onCompare}
+        hasCompared={false}
+        total={0}
+        currentIndex={0}
+        onPrev={() => {}}
+        onNext={() => {}}
+      />,
+    );
+    await user.click(screen.getByRole('button', { name: /Compare A & B/i }));
+    expect(onCompare).toHaveBeenCalled();
+  });
+
+  it('已比较后展示 DiffNavigator（上一处/下一处）', () => {
+    render(
+      <CompareActionBar
+        canCompare={true}
+        onCompare={() => {}}
+        hasCompared={true}
+        total={3}
+        currentIndex={1}
+        onPrev={() => {}}
+        onNext={() => {}}
+      />,
+    );
+    expect(screen.getByLabelText('上一个')).toBeInTheDocument();
+    expect(screen.getByLabelText('下一个')).toBeInTheDocument();
+    expect(screen.queryByText('无差异')).not.toBeInTheDocument();
+  });
+});

src/pages/JsonTools/components/__tests__/JsonDiffPanel.test.tsx

@@ -0,0 +1,57 @@
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { describe, it, expect, vi } from 'vitest';
+import JsonDiffPanel from '../JsonDiffPanel';
+
+describe('JsonDiffPanel', () => {
+  it('展开态渲染标题与输入框', () => {
+    render(
+      <JsonDiffPanel
+        title="数据 A（原始）"
+        placeholder="x"
+        value=""
+        onChange={() => {}}
+        collapsed={false}
+        onToggleCollapse={() => {}}
+        preview=""
+      />,
+    );
+    expect(screen.getByText('数据 A（原始）')).toBeInTheDocument();
+    expect(screen.getByPlaceholderText('x')).toBeInTheDocument();
+  });
+
+  it('折叠态渲染预览并隐藏输入框', () => {
+    render(
+      <JsonDiffPanel
+        title="数据 A（原始）"
+        placeholder="x"
+        value=""
+        onChange={() => {}}
+        collapsed={true}
+        onToggleCollapse={() => {}}
+        preview="abc（点击展开）"
+      />,
+    );
+    expect(screen.getByText('abc（点击展开）')).toBeInTheDocument();
+    const input = screen.getByPlaceholderText('x');
+    expect(input.closest('.opacity-0')).toBeInTheDocument();
+  });
+
+  it('点击标题可切换折叠', async () => {
+    const user = userEvent.setup();
+    const onToggle = vi.fn();
+    render(
+      <JsonDiffPanel
+        title="T"
+        placeholder="x"
+        value=""
+        onChange={() => {}}
+        collapsed={false}
+        onToggleCollapse={onToggle}
+        preview=""
+      />,
+    );
+    await user.click(screen.getByText('T'));
+    expect(onToggle).toHaveBeenCalled();
+  });
+});

src/pages/JsonTools/components/__tests__/JsonFormatSection.test.tsx

@@ -0,0 +1,62 @@
+import { render, screen, waitFor } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { useEffect, useState } from 'react';
+import { describe, it, expect } from 'vitest';
+import JsonFormatSection from '../JsonFormatSection';
+import type { UseJsonToolsReturn } from '../../useJsonTools';
+
+function Harness({ initial = '' }: { initial?: string }) {
+  const [input, setInput] = useState(initial);
+  const [debouncedInput, setDebouncedInput] = useState(initial);
+  useEffect(() => {
+    const t = setTimeout(() => setDebouncedInput(input), 250);
+    return () => clearTimeout(t);
+  }, [input]);
+  const tools = { input, setInput, debouncedInput } as unknown as UseJsonToolsReturn;
+  return <JsonFormatSection tools={tools} />;
+}
+
+describe('JsonFormatSection', () => {
+  it('渲染输入面板标题与缩进/键名排序工具栏', () => {
+    render(<Harness />);
+    expect(screen.getByText('JSON 输入')).toBeInTheDocument();
+    expect(screen.getByText('缩进')).toBeInTheDocument();
+    expect(screen.getByText('键名排序')).toBeInTheDocument();
+  });
+
+  it('输入无效 JSON 时不渲染结果面板与占位区', async () => {
+    render(<Harness initial="{ invalid json " />);
+    await waitFor(() => {
+      expect(screen.queryByText('格式化结果')).not.toBeInTheDocument();
+    });
+    expect(
+      screen.queryByText('请修正上方 JSON 的语法错误以开启实时流式格式化'),
+    ).not.toBeInTheDocument();
+    expect(screen.queryByText('输入 JSON 后点击格式化')).not.toBeInTheDocument();
+  });
+
+  it('输入有效 JSON 后渲染格式化结果面板', async () => {
+    render(<Harness initial='{"a":1,"b":2}' />);
+    await waitFor(() => {
+      expect(screen.getByText('格式化结果')).toBeInTheDocument();
+    });
+    expect(screen.getByText(/"a": 1/)).toBeInTheDocument();
+    expect(screen.getByText(/"b": 2/)).toBeInTheDocument();
+  });
+
+  it('点击标题可折叠输入面板', async () => {
+    const user = userEvent.setup();
+    render(<Harness initial='{"a":1}' />);
+    await waitFor(() => {
+      expect(screen.getByText('格式化结果')).toBeInTheDocument();
+    });
+
+    await user.click(screen.getByText('JSON 输入'));
+
+    const input = screen.getByPlaceholderText('输入需要格式化的 JSON...');
+    await waitFor(() => {
+      expect(input.closest('.opacity-0')).toBeInTheDocument();
+    });
+    expect(screen.getByText('{"a":1}（点击展开）')).toBeInTheDocument();
+  });
+});

src/pages/JsonTools/index.tsx

@@ -1,41 +1,18 @@
-import JsonDiffInput from './components/JsonDiffInput';
-import DiffResult from './components/DiffResult';
-import DiffNavigator from './components/DiffNavigator';
+import DiffWorkspace from './components/DiffWorkspace';
 import JsonFormatSection from './components/JsonFormatSection';
 import JsonConvertSection from './components/JsonConvertSection';
 import SwitchButtonGroup from '@/components/SwitchButtonGroup';
-import EmptyPlaceholder from '@/components/EmptyPlaceholder';
 import { useJsonTools } from './useJsonTools';
 import type { JsonToolsPageMode } from '@/types/storage';
-import type { ViewMode } from './types';
 
 type PageMode = JsonToolsPageMode;
 
 export default function Index() {
-  const {
-    pageMode,
-    setPageMode,
-    leftInput,
-    rightInput,
-    setLeftInput,
-    setRightInput,
-    leftError,
-    rightError,
-    viewMode,
-    setViewMode,
-    diffResult,
-    total,
-    currentDiffIndex,
-    handlePrev,
-    handleNext,
-    activePath,
-    yamlConvert,
-    tomlConvert,
-    minifyConvert,
-  } = useJsonTools();
+  const tools = useJsonTools();
+  const { pageMode, setPageMode, yamlConvert, tomlConvert, minifyConvert } = tools;
 
   return (
-    <div className="p-4 w-full flex flex-col space-y-4 min-h-[500px] select-none">
+    <div className="flex h-full min-h-0 w-full select-none flex-col space-y-4 p-4">
       <SwitchButtonGroup
         value={pageMode}
         onChange={(v: PageMode) => setPageMode(v)}
@@ -47,70 +24,19 @@ export default function Index() {
           { value: 'minify', label: '压缩' },
         ]}
         size="small"
-        className="w-full sm:w-auto"
+        className="w-full shrink-0 sm:w-auto"
       />
 
       {pageMode === 'diff' ? (
-        <div className="flex flex-col space-y-4">
-          <div className="flex h-10 items-center justify-between px-1.5 bg-secondary/40 rounded-xl border border-border/60">
-            <SwitchButtonGroup
-              value={viewMode}
-              onChange={(v: ViewMode) => setViewMode(v)}
-              options={[
-                { value: 'sideBySide', label: '并排' },
-                { value: 'unified', label: '统一' },
-              ]}
-              size="small"
-            />
-          </div>
-
-          <div className="flex flex-col md:flex-row gap-4 w-full items-stretch">
-            <JsonDiffInput
-              label="原始 JSON"
-              placeholder="输入原始 JSON..."
-              value={leftInput}
-              onChange={setLeftInput}
-              error={leftError}
-              minRows={9}
-            />
-            <JsonDiffInput
-              label="目标 JSON"
-              placeholder="输入目标 JSON..."
-              value={rightInput}
-              onChange={setRightInput}
-              error={rightError}
-              minRows={9}
-            />
-          </div>
-
-          {diffResult ? (
-            <div className="flex flex-col space-y-3.5 w-full pt-1">
-              <div className="flex justify-center w-full">
-                <DiffNavigator
-                  total={total}
-                  currentIndex={currentDiffIndex}
-                  onPrev={handlePrev}
-                  onNext={handleNext}
-                />
-              </div>
-              <DiffResult result={diffResult} viewMode={viewMode} activePath={activePath} />
-            </div>
-          ) : (
-            <EmptyPlaceholder className="min-h-[140px]" messageClassName="max-w-[260px]">
-              {leftError || rightError
-                ? '请修正上方 JSON 的语法错误以开启实时流式比对'
-                : '输入两侧 JSON 后点击比较'}
-            </EmptyPlaceholder>
-          )}
-        </div>
+        <DiffWorkspace tools={tools} />
       ) : pageMode === 'format' ? (
-        <JsonFormatSection />
+        <JsonFormatSection tools={tools} />
       ) : pageMode === 'yaml' ? (
-        <JsonConvertSection mode="yaml" convertFunction={yamlConvert} />
+        <JsonConvertSection tools={tools} mode="yaml" convertFunction={yamlConvert} />
       ) : pageMode === 'toml' ? (
-        <JsonConvertSection mode="toml" convertFunction={tomlConvert} />
+        <JsonConvertSection tools={tools} mode="toml" convertFunction={tomlConvert} />
       ) : (
-        <JsonConvertSection mode="minify" convertFunction={minifyConvert} />
+        <JsonConvertSection tools={tools} mode="minify" convertFunction={minifyConvert} />
       )}
     </div>
   );

src/pages/JsonTools/useJsonTools.ts

@@ -5,10 +5,14 @@ import { jsonToYaml } from '@/utils/jsonToYaml';
 import { jsonToToml } from '@/utils/jsonToToml';
 import { minifyJson } from '@/utils/jsonFormatter';
 import { isValidPageMode, tryParse } from './constants';
+import { useMediaQuery } from '@/hooks/useMediaQuery';
 import type { JsonToolsPageMode } from '@/types/storage';
 import type { ConvertFunction, ViewMode } from './types';
 
+type DiffResultValue = ReturnType<typeof diffJson>;
+
 export interface UseJsonToolsReturn {
+  isWide: boolean;
   pageMode: JsonToolsPageMode;
   setPageMode: (mode: JsonToolsPageMode) => void;
   leftInput: string;
@@ -17,34 +21,77 @@ export interface UseJsonToolsReturn {
   setRightInput: (val: string) => void;
   leftError: string | null;
   rightError: string | null;
+  /** format/yaml/toml/minify 共享的输入内容（已持久化） */
+  input: string;
+  setInput: (val: string) => void;
+  /** input 防抖后的快照，用于格式化/转换计算与持久化 */
+  debouncedInput: string;
   viewMode: ViewMode;
   setViewMode: (mode: ViewMode) => void;
-  diffResult: ReturnType<typeof diffJson> | null;
+  /** 当前生效的差异结果：宽屏为实时计算，窄屏为手动 Compare 后的结果 */
+  activeResult: DiffResultValue | null;
   total: number;
   currentDiffIndex: number;
   handlePrev: () => void;
   handleNext: () => void;
   activePath: string | undefined;
+  /** 窄屏：是否已点击 Compare 生成结果 */
+  hasCompared: boolean;
+  /** 窄屏：左右面板是否折叠 */
+  collapsedA: boolean;
+  collapsedB: boolean;
+  toggleCollapseA: () => void;
+  toggleCollapseB: () => void;
+  /** 窄屏：两侧均有合法非空输入时可触发比对 */
+  canCompare: boolean;
+  handleCompare: () => void;
+  /** 窄屏：折叠态单行预览文本 */
+  previewA: string;
+  previewB: string;
   yamlConvert: ConvertFunction;
   tomlConvert: ConvertFunction;
   minifyConvert: ConvertFunction;
 }
 
+export const buildPreview = (raw: string): string => {
+  const single = raw.replace(/\s+/g, ' ').trim();
+  const truncated = single.length > 80 ? `${single.slice(0, 80)}…` : single;
+  return truncated ? `${truncated}（点击展开）` : '（点击展开）';
+};
+
 export function useJsonTools(): UseJsonToolsReturn {
+  const isWide = useMediaQuery('(min-width: 768px)');
+
   const [pageMode, setPageMode] = useStorageState('jsonTools/pageMode', 'diff', isValidPageMode);
 
-  const [leftInput, setLeftInput] = useState('');
-  const [rightInput, setRightInput] = useState('');
-  const [debouncedLeft, setDebouncedLeft] = useState('');
-  const [debouncedRight, setDebouncedRight] = useState('');
+  const [persistedLeft, setPersistedLeft] = useStorageState('jsonTools/diffLeft', '');
+  const [persistedRight, setPersistedRight] = useStorageState('jsonTools/diffRight', '');
+  const [persistedInput, setPersistedInput] = useStorageState('jsonTools/input', '');
+
+  const [leftInput, setLeftInputState] = useState<string>(persistedLeft);
+  const [rightInput, setRightInputState] = useState<string>(persistedRight);
+  const [input, setInput] = useState<string>(persistedInput);
+  const [debouncedLeft, setDebouncedLeft] = useState<string>(persistedLeft);
+  const [debouncedRight, setDebouncedRight] = useState<string>(persistedRight);
+  const [debouncedInput, setDebouncedInput] = useState<string>(persistedInput);
 
   useEffect(() => {
     const handle = setTimeout(() => {
       setDebouncedLeft(leftInput);
       setDebouncedRight(rightInput);
+      setPersistedLeft(leftInput);
+      setPersistedRight(rightInput);
     }, 250);
     return () => clearTimeout(handle);
-  }, [leftInput, rightInput]);
+  }, [leftInput, rightInput, setPersistedLeft, setPersistedRight]);
+
+  useEffect(() => {
+    const handle = setTimeout(() => {
+      setDebouncedInput(input);
+      setPersistedInput(input);
+    }, 250);
+    return () => clearTimeout(handle);
+  }, [input, setPersistedInput]);
 
   const parseState = useMemo(() => {
     const invalidMsg = '无效的 JSON 格式';
@@ -58,9 +105,17 @@ export function useJsonTools(): UseJsonToolsReturn {
   const rightError = parseState.right.error;
 
   const [viewMode, setViewMode] = useState<ViewMode>('sideBySide');
+  const activeViewMode = isWide ? viewMode : 'unified';
   const [currentDiffIndex, setCurrentDiffIndex] = useState(0);
 
-  const diffResult = useMemo(() => {
+  // 窄屏手动比对状态
+  const [hasCompared, setHasCompared] = useState(false);
+  const [manualResult, setManualResult] = useState<DiffResultValue | null>(null);
+  const [collapsedA, setCollapsedA] = useState(false);
+  const [collapsedB, setCollapsedB] = useState(false);
+
+  // 宽屏：实时流式比对（保持原行为）
+  const liveResult = useMemo<DiffResultValue | null>(() => {
     const { left, right } = parseState;
     if (left.error || right.error || debouncedLeft.trim() === '' || debouncedRight.trim() === '') {
       return null;
@@ -68,7 +123,70 @@ export function useJsonTools(): UseJsonToolsReturn {
     return diffJson(left.value, right.value);
   }, [parseState, debouncedLeft, debouncedRight]);
 
-  const total = diffResult?.diffPaths.length ?? 0;
+  const activeResult = isWide ? liveResult : manualResult;
+
+  // 即时解析（用于比对按钮可用态与折叠预览，避免 250ms 延迟）
+  const immediateParse = useMemo(() => {
+    const invalidMsg = '无效的 JSON 格式';
+    return {
+      left: tryParse(leftInput, invalidMsg),
+      right: tryParse(rightInput, invalidMsg),
+    };
+  }, [leftInput, rightInput]);
+
+  const canCompare =
+    leftInput.trim() !== '' &&
+    rightInput.trim() !== '' &&
+    !immediateParse.left.error &&
+    !immediateParse.right.error;
+
+  const previewA = useMemo(() => buildPreview(leftInput), [leftInput]);
+  const previewB = useMemo(() => buildPreview(rightInput), [rightInput]);
+
+  const setLeftInput = useCallback(
+    (val: string) => {
+      setLeftInputState(val);
+      if (hasCompared) {
+        setHasCompared(false);
+        setManualResult(null);
+        setCurrentDiffIndex(0);
+      } else {
+        setCurrentDiffIndex(0);
+      }
+    },
+    [hasCompared],
+  );
+
+  const setRightInput = useCallback(
+    (val: string) => {
+      setRightInputState(val);
+      if (hasCompared) {
+        setHasCompared(false);
+        setManualResult(null);
+        setCurrentDiffIndex(0);
+      } else {
+        setCurrentDiffIndex(0);
+      }
+    },
+    [hasCompared],
+  );
+
+  const handleCompare = useCallback(() => {
+    if (!canCompare) return;
+    const left = immediateParse.left.value;
+    const right = immediateParse.right.value;
+    const result = diffJson(left, right);
+    setManualResult(result);
+    setHasCompared(true);
+    setCollapsedA(true);
+    setCollapsedB(true);
+    setCurrentDiffIndex(0);
+  }, [canCompare, immediateParse]);
+
+  const toggleCollapseA = useCallback(() => setCollapsedA((v) => !v), []);
+  const toggleCollapseB = useCallback(() => setCollapsedB((v) => !v), []);
+
+  const total = activeResult?.diffPaths.length ?? 0;
 
   const handlePrev = useCallback(() => {
     if (total === 0) return;
@@ -80,7 +198,10 @@ export function useJsonTools(): UseJsonToolsReturn {
     setCurrentDiffIndex((idx) => (idx + 1) % total);
   }, [total]);
 
-  const activePath = diffResult && total > 0 ? diffResult.diffPaths[currentDiffIndex] : undefined;
+  const activePath =
+    activeResult && total > 0 && currentDiffIndex < total
+      ? activeResult.diffPaths[currentDiffIndex]
+      : undefined;
 
   const yamlConvert: ConvertFunction = useCallback((text: string) => {
     const r = jsonToYaml(text);
@@ -98,28 +219,35 @@ export function useJsonTools(): UseJsonToolsReturn {
   }, []);
 
   return {
+    isWide,
     pageMode,
     setPageMode,
     leftInput,
     rightInput,
-    setLeftInput: (val: string) => {
-      setLeftInput(val);
-      setCurrentDiffIndex(0);
-    },
-    setRightInput: (val: string) => {
-      setRightInput(val);
-      setCurrentDiffIndex(0);
-    },
+    setLeftInput,
+    setRightInput,
     leftError,
     rightError,
-    viewMode,
+    input,
+    setInput,
+    debouncedInput,
+    viewMode: activeViewMode,
     setViewMode,
-    diffResult,
+    activeResult,
     total,
     currentDiffIndex,
     handlePrev,
     handleNext,
     activePath,
+    hasCompared,
+    collapsedA,
+    collapsedB,
+    toggleCollapseA,
+    toggleCollapseB,
+    canCompare,
+    handleCompare,
+    previewA,
+    previewB,
     yamlConvert,
     tomlConvert,
     minifyConvert,

src/pages/TestDataGenerator/components/GeneratorConfig.tsx

@@ -84,7 +84,11 @@ export default function GeneratorConfig({ generator, params, onChange }: Generat
               </SelectTrigger>
               <SelectContent>
                 {param.options?.map((option) => (
-                  <SelectItem key={String(option.value)} value={String(option.value)}>
+                  <SelectItem
+                    key={String(option.value)}
+                    value={String(option.value)}
+                    className="cursor-pointer"
+                  >
                     {option.label}
                   </SelectItem>
                 ))}

src/pages/Timestamp/components/ConverterForm.tsx

@@ -41,10 +41,7 @@ export default function ConverterForm({
           placeholder={INPUT_PLACEHOLDERS[mode]}
           value={input}
           onChange={(e) => setInput(e.target.value)}
-          className={cn(
-            'font-mono font-semibold h-10 shadow-sm placeholder:text-muted-foreground/60 focus:bg-background',
-            error && 'border-destructive focus-visible:ring-destructive',
-          )}
+          className={cn('h-10', error && 'border-destructive')}
         />
 
         {error && <p className="text-destructive text-xs font-medium px-0.5">{error}</p>}
@@ -60,16 +57,13 @@ export default function ConverterForm({
         />
 
         <Select value={zone} onValueChange={(v: string) => setZone(v as ZoneType)}>
-          <SelectTrigger className="flex-1 font-mono font-semibold h-9 shadow-sm bg-background">
+          <SelectTrigger>
             <SelectValue placeholder="选择时区" />
           </SelectTrigger>
-          <SelectContent className="max-h-64 font-mono">
+
+          <SelectContent className="max-h-64">
             {ZONES.map((z) => (
-              <SelectItem
-                key={z}
-                value={z}
-                className="text-xs font-semibold focus:bg-accent cursor-pointer"
-              >
+              <SelectItem key={z} value={z} className="cursor-pointer">
                 {z}
               </SelectItem>
             ))}

src/pages/Timestamp/components/LiveClock.tsx

@@ -1,4 +1,5 @@
-import React, { useEffect, useState } from 'react';
+import type { HTMLAttributes } from 'react';
+import { useEffect, useState } from 'react';
 import { Clock } from 'lucide-react';
 import { toast } from 'sonner';
 import { CopyButton } from '@/components/CopyButton';
@@ -7,7 +8,7 @@ import { msToUnit } from '../constants';
 import { cn } from '@/lib/utils';
 import { Button } from '@/components/ui/button';
 
-interface LiveClockProps extends React.HTMLAttributes<HTMLDivElement> {
+interface LiveClockProps extends HTMLAttributes<HTMLDivElement> {
   unit: UnitType;
   onUseNow: (val: number) => void;
 }
@@ -28,18 +29,14 @@ export default function LiveClock({ unit, onUseNow, className, ...props }: LiveC
   return (
     <div
       className={cn(
-        'flex items-center gap-3 px-3 h-10 rounded-lg border border-border/80 bg-secondary/50',
+        'flex items-center gap-3 px-3 h-10 rounded-lg font-bold text-[12px] border px-[20px]',
         className,
       )}
       {...props}
     >
-      <span className="text-muted-foreground font-bold text-[10px] uppercase tracking-wider whitespace-nowrap shrink-0 selection:bg-transparent select-none">
-        当前时间戳
-      </span>
+      <span>当前时间戳</span>
 
-      <span className="flex-1 font-mono font-bold text-foreground text-sm tracking-tight leading-none truncate tabular-nums">
-        {text}
-      </span>
+      <span className="flex-1 text-sm ">{text}</span>
 
       <Button
         type="button"
@@ -50,12 +47,12 @@ export default function LiveClock({ unit, onUseNow, className, ...props }: LiveC
         title="填充到下方"
         variant="ghost"
         size="icon"
-        className="h-7 w-7 text-muted-foreground hover:text-foreground"
+        className="h-7 w-7"
       >
         <Clock className="w-3.5 h-3.5" />
       </Button>
 
-      <CopyButton text={text} tooltip="复制时间戳" className="h-7 w-7 rounded-md border" />
+      <CopyButton text={text} tooltip="复制时间戳" className="h-7 w-7" />
     </div>
   );
 }

src/pages/Timestamp/components/ResultView.tsx

@@ -34,16 +34,15 @@ export default function ResultView({
         转换结果
       </span>
 
-      <div className="bg-card text-card-foreground border border-border p-4 sm:p-5 rounded-xl relative shadow-sm flex justify-between items-center gap-4 focus-within:ring-1 focus-within:ring-ring">
-        <span className="font-mono font-extrabold text-foreground break-all text-xl sm:text-2xl tracking-tight leading-tight select-all tabular-nums">
-          {result}
-        </span>
+      <div className="bg-card border p-4 rounded-lg flex items-center gap-3 justify-between">
+        <span className="break-all text-lg select-all flex-1">{result}</span>
+
         <CopyButton
           text={result}
           tooltip="复制结果"
           variant="ghost"
           size="icon"
-          className="h-7 w-7 text-muted-foreground hover:text-foreground"
+          className="h-7 w-7"
         />
       </div>
     </div>

src/styles/shell.css

@@ -93,6 +93,27 @@
   display: none;
 }
 
+/* 细滚动条：仅作用于需要内部滚动的面板/结果区（覆盖上方的全局隐藏） */
+.diff-scroll {
+  scrollbar-width: thin;
+  scrollbar-color: rgba(0, 0, 0, 0.2) transparent;
+}
+.diff-scroll::-webkit-scrollbar {
+  display: block;
+  width: 6px;
+  height: 6px;
+}
+.diff-scroll::-webkit-scrollbar-track {
+  background: transparent;
+}
+.diff-scroll::-webkit-scrollbar-thumb {
+  background: rgba(0, 0, 0, 0.2);
+  border-radius: 3px;
+}
+.dark .diff-scroll::-webkit-scrollbar-thumb {
+  background: rgba(255, 255, 255, 0.25);
+}
+
 @layer components {
   .page-transition-enter {
     @apply motion-reduce:transition-none;

src/types/storage.d.ts

@@ -89,6 +89,12 @@ export interface StorageSchema {
   'qrCode/urlExpanded': boolean;
   /** JSON 工具页面当前子模式 */
   'jsonTools/pageMode': JsonToolsPageMode;
+  /** JSON 工具：format/yaml/toml/minify 共享的输入内容 */
+  'jsonTools/input': string;
+  /** JSON 工具：diff 模式左侧输入内容 */
+  'jsonTools/diffLeft': string;
+  /** JSON 工具：diff 模式右侧输入内容 */
+  'jsonTools/diffRight': string;
   /** Base64 转换器页面当前子模式 */
   'base64Converter/pageMode': Base64ConverterPageMode;
   /** Base64 转换器「文件」子模式当前方向 */

src/utils/diffEngine.ts

@@ -19,7 +19,6 @@ const buildPath = (parent: string, key: string, isArrayChild: boolean): string =
   }
   const needsEscaping = key.includes('.') || key.includes('[') || key.includes(' ');
   const formattedKey = needsEscaping ? `["${key}"]` : `.${key}`;
-
   return parent === ROOT_PATH ? `${ROOT_PATH}${formattedKey}` : `${parent}${formattedKey}`;
 };
 
@@ -30,104 +29,48 @@ const primitiveEqual = (a: unknown, b: unknown): boolean => {
   return a === b;
 };
 
-const diffNode = (
+// ---------- 迭代遍历框架 ----------
+
+interface StackFrame {
+  left: MaybeMissing;
+  right: MaybeMissing;
+  key: string;
+  path: string;
+  /** 子节点数量（组装时从 resultStack 弹出） */
+  childCount: number;
+  /** 是否已展开 */
+  assembled: boolean;
+  /** 分类结果缓存 */
+  leftObj: boolean;
+  rightObj: boolean;
+  leftArr: boolean;
+  rightArr: boolean;
+  leftIsContainer: boolean;
+  rightIsContainer: boolean;
+}
+
+const createLeafNode = (
+  key: string,
+  path: string,
+  type: DiffNode['type'],
+  oldValue: MaybeMissing,
+  newValue: MaybeMissing,
+): DiffNode => ({
+  key,
+  type,
+  oldValue: oldValue === SENTINEL ? undefined : oldValue,
+  newValue: newValue === SENTINEL ? undefined : newValue,
+  path,
+  isLeaf: true,
+  hasDiffInChildren: false,
+});
+
+const classifyPrimitive = (
   left: MaybeMissing,
   right: MaybeMissing,
   key: string,
   path: string,
-  diffPaths: string[],
-): DiffNode => {
-  if (left === SENTINEL && right !== SENTINEL) {
-    diffPaths.push(path);
-    return {
-      key,
-      type: 'added',
-      oldValue: undefined,
-      newValue: right,
-      path,
-      isLeaf: !isObject(right) && !isArray(right),
-      hasDiffInChildren: false,
-    };
-  }
-
-  if (right === SENTINEL && left !== SENTINEL) {
-    diffPaths.push(path);
-    return {
-      key,
-      type: 'removed',
-      oldValue: left,
-      newValue: undefined,
-      path,
-      isLeaf: !isObject(left) && !isArray(left),
-      hasDiffInChildren: false,
-    };
-  }
-
-  const leftObj = isObject(left);
-  const rightObj = isObject(right);
-  const leftArr = isArray(left);
-  const rightArr = isArray(right);
-
-  if (leftObj && rightObj) {
-    const keySet = new Set<string>();
-    const leftKeys = Object.keys(left);
-    const rightKeys = Object.keys(right);
-
-    for (let i = 0; i < leftKeys.length; i++) keySet.add(leftKeys[i]);
-    for (let i = 0; i < rightKeys.length; i++) keySet.add(rightKeys[i]);
-
-    const children: DiffNode[] = [];
-    keySet.forEach((k) => {
-      const childPath = buildPath(path, k, false);
-      const l: MaybeMissing = k in left ? left[k] : SENTINEL;
-      const r: MaybeMissing = k in right ? right[k] : SENTINEL;
-      children.push(diffNode(l, r, k, childPath, diffPaths));
-    });
-
-    const hasDiffInChildren = children.some((c) => c.type !== 'unchanged' || c.hasDiffInChildren);
-
-    return {
-      key,
-      type: hasDiffInChildren ? 'modified' : 'unchanged',
-      oldValue: left,
-      newValue: right,
-      children,
-      path,
-      isLeaf: false,
-      hasDiffInChildren,
-    };
-  }
-
-  if (leftArr && rightArr) {
-    const len = Math.max(left.length, right.length);
-    const children: DiffNode[] = new Array(len);
-
-    for (let i = 0; i < len; i++) {
-      const k = String(i);
-      const childPath = buildPath(path, k, true);
-      const l: MaybeMissing = i < left.length ? left[i] : SENTINEL;
-      const r: MaybeMissing = i < right.length ? right[i] : SENTINEL;
-      children[i] = diffNode(l, r, k, childPath, diffPaths);
-    }
-
-    const hasDiffInChildren = children.some((c) => c.type !== 'unchanged' || c.hasDiffInChildren);
-
-    return {
-      key,
-      type: hasDiffInChildren ? 'modified' : 'unchanged',
-      oldValue: left,
-      newValue: right,
-      children,
-      path,
-      isLeaf: false,
-      hasDiffInChildren,
-    };
-  }
-
-  const leftIsContainer = leftObj || leftArr;
-  const rightIsContainer = rightObj || rightArr;
-
-  if (!leftIsContainer && !rightIsContainer) {
+): DiffNode | null => {
   if (left === null || right === null) {
     if (left === null && right === null) {
       return {
@@ -140,8 +83,9 @@ const diffNode = (
         hasDiffInChildren: false,
       };
     }
-    } else if (typeof left === typeof right) {
-      if (primitiveEqual(left, right)) {
+    return null;
+  }
+  if (typeof left === typeof right && primitiveEqual(left, right)) {
     return {
       key,
       type: 'unchanged',
@@ -152,27 +96,172 @@ const diffNode = (
       hasDiffInChildren: false,
     };
   }
-    }
-  }
-
-  diffPaths.push(path);
-  return {
-    key,
-    type: 'modified',
-    oldValue: left,
-    newValue: right,
-    path,
-    isLeaf: !leftIsContainer && !rightIsContainer,
-    hasDiffInChildren: false,
-  };
+  return null;
 };
 
 /**
- * 比较两个 JSON 值的差异
+ * 合并对象 key：左全部 + 右独有的（无需 Set，O(K) in 查找）
+ */
+const mergedKeys = (left: Record<string, unknown>, right: Record<string, unknown>): string[] => {
+  const result: string[] = Object.keys(left);
+  for (const k of Object.keys(right)) {
+    if (!(k in left)) result.push(k);
+  }
+  return result;
+};
+
+/**
+ * 比较两个 JSON 值的差异（迭代版，显式栈替代递归）
  */
 export const diffJson = (left: unknown, right: unknown): DiffResult => {
   const diffPaths: string[] = [];
-  const root = diffNode(left, right, '', ROOT_PATH, diffPaths);
+
+  const rootFrame: StackFrame = {
+    left,
+    right,
+    key: '',
+    path: ROOT_PATH,
+    childCount: 0,
+    assembled: false,
+    leftObj: isObject(left),
+    rightObj: isObject(right),
+    leftArr: isArray(left),
+    rightArr: isArray(right),
+    leftIsContainer: isObject(left) || isArray(left),
+    rightIsContainer: isObject(right) || isArray(right),
+  };
+
+  const stack: StackFrame[] = [rootFrame];
+  const resultStack: DiffNode[] = [];
+
+  while (stack.length > 0) {
+    const frame = stack.pop()!;
+
+    // ---- 组装阶段：从 resultStack 弹出子节点 ----
+    if (frame.assembled) {
+      const { childCount } = frame;
+      const children: DiffNode[] = new Array(childCount);
+      // 子节点按正序压入 resultStack，弹出时逆序取
+      for (let i = childCount - 1; i >= 0; i--) {
+        children[i] = resultStack.pop()!;
+      }
+
+      const hasDiffInChildren = children.some((c) => c.type !== 'unchanged' || c.hasDiffInChildren);
+      const type: DiffNode['type'] = hasDiffInChildren ? 'modified' : 'unchanged';
+
+      const node: DiffNode = {
+        key: frame.key,
+        type,
+        oldValue: frame.left === SENTINEL ? undefined : frame.left,
+        newValue: frame.right === SENTINEL ? undefined : frame.right,
+        children,
+        path: frame.path,
+        isLeaf: false,
+        hasDiffInChildren,
+      };
+      resultStack.push(node);
+      continue;
+    }
+
+    const { left: l, right: r } = frame;
+
+    // ---- 一侧缺失 ----
+    if (l === SENTINEL && r !== SENTINEL) {
+      diffPaths.push(frame.path);
+      resultStack.push(createLeafNode(frame.key, frame.path, 'added', undefined, r));
+      continue;
+    }
+    if (r === SENTINEL && l !== SENTINEL) {
+      diffPaths.push(frame.path);
+      resultStack.push(createLeafNode(frame.key, frame.path, 'removed', l, undefined));
+      continue;
+    }
+
+    // ---- 双侧对象 ----
+    if (frame.leftObj && frame.rightObj) {
+      const keys = mergedKeys(l as Record<string, unknown>, r as Record<string, unknown>);
+      // 压入组装帧
+      stack.push({ ...frame, childCount: keys.length, assembled: true });
+      // 逆序压入子帧，保证正序处理
+      for (let i = keys.length - 1; i >= 0; i--) {
+        const k = keys[i];
+        const childPath = buildPath(frame.path, k, false);
+        const leftVal: MaybeMissing =
+          k in (l as Record<string, unknown>) ? (l as Record<string, unknown>)[k] : SENTINEL;
+        const rightVal: MaybeMissing =
+          k in (r as Record<string, unknown>) ? (r as Record<string, unknown>)[k] : SENTINEL;
+        stack.push({
+          left: leftVal,
+          right: rightVal,
+          key: k,
+          path: childPath,
+          childCount: 0,
+          assembled: false,
+          leftObj: isObject(leftVal),
+          rightObj: isObject(rightVal),
+          leftArr: isArray(leftVal),
+          rightArr: isArray(rightVal),
+          leftIsContainer: isObject(leftVal) || isArray(leftVal),
+          rightIsContainer: isObject(rightVal) || isArray(rightVal),
+        });
+      }
+      continue;
+    }
+
+    // ---- 双侧数组 ----
+    if (frame.leftArr && frame.rightArr) {
+      const leftArr = l as unknown[];
+      const rightArr = r as unknown[];
+      const len = Math.max(leftArr.length, rightArr.length);
+
+      stack.push({ ...frame, childCount: len, assembled: true });
+      for (let i = len - 1; i >= 0; i--) {
+        const k = String(i);
+        const childPath = buildPath(frame.path, k, true);
+        const leftVal: MaybeMissing = i < leftArr.length ? leftArr[i] : SENTINEL;
+        const rightVal: MaybeMissing = i < rightArr.length ? rightArr[i] : SENTINEL;
+        stack.push({
+          left: leftVal,
+          right: rightVal,
+          key: k,
+          path: childPath,
+          childCount: 0,
+          assembled: false,
+          leftObj: isObject(leftVal),
+          rightObj: isObject(rightVal),
+          leftArr: isArray(leftVal),
+          rightArr: isArray(rightVal),
+          leftIsContainer: isObject(leftVal) || isArray(leftVal),
+          rightIsContainer: isObject(rightVal) || isArray(rightVal),
+        });
+      }
+      continue;
+    }
+
+    // ---- 原始值比较 ----
+    if (!frame.leftIsContainer && !frame.rightIsContainer) {
+      const primitiveResult = classifyPrimitive(l, r, frame.key, frame.path);
+      if (primitiveResult) {
+        resultStack.push(primitiveResult);
+        continue;
+      }
+    }
+
+    // 类型不同或容器 vs 原始值 → modified
+    diffPaths.push(frame.path);
+    resultStack.push({
+      key: frame.key,
+      type: 'modified',
+      oldValue: l,
+      newValue: r,
+      path: frame.path,
+      isLeaf: !frame.leftIsContainer && !frame.rightIsContainer,
+      hasDiffInChildren: false,
+    });
+  }
+
+  const root = resultStack[resultStack.length - 1];
+
   return {
     root,
     diffPaths,

tailwind.shell.config.js

@@ -11,7 +11,6 @@ export default {
     './src/components/ErrorBoundary.tsx',
     './src/components/ErrorFallback.tsx',
     './src/components/PageErrorBoundary.tsx',
-    './src/components/PageSkeleton.tsx',
     './src/components/ui/button.tsx',
     './src/components/ui/input.tsx',
     './src/components/ui/sonner.tsx',