import * as React from 'react';
import { cn } from '@/lib/utils';

// Card 风格:无 shadow,只 border + 浅 bg。
// 现代 SaaS(Anthropic / OpenAI / Vercel)主流方向:layout 靠 border 切分,
// 阴影只给"浮起"层(popover / dialog),不给静态卡片。
// padding 缩到 p-5(design-system desktop 默认),CardContent 顶 padding 缩到 pt-0 之前的 pb 维持。

/**
 * 内容卡片容器 — 与 CardHeader/CardTitle/CardDescription/CardContent/CardFooter 组合使用。
 * @category display
 */
export const Card = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
  ({ className, ...props }, ref) => (
    <div
      ref={ref}
      className={cn('rounded-lg border bg-card text-card-foreground', className)}
      {...props}
    />
  ),
);
Card.displayName = 'Card';

export const CardHeader = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
  ({ className, ...props }, ref) => (
    <div ref={ref} className={cn('flex flex-col space-y-1 p-5 pb-3', className)} {...props} />
  ),
);
CardHeader.displayName = 'CardHeader';

export const CardTitle = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
  ({ className, ...props }, ref) => (
    <div
      ref={ref}
      className={cn('text-base font-semibold leading-none tracking-tight', className)}
      {...props}
    />
  ),
);
CardTitle.displayName = 'CardTitle';

export const CardDescription = React.forwardRef<
  HTMLDivElement,
  React.HTMLAttributes<HTMLDivElement>
>(({ className, ...props }, ref) => (
  <div ref={ref} className={cn('text-xs text-muted-foreground', className)} {...props} />
));
CardDescription.displayName = 'CardDescription';

export const CardContent = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
  ({ className, ...props }, ref) => <div ref={ref} className={cn('p-5 pt-0', className)} {...props} />,
);
CardContent.displayName = 'CardContent';
