source: chapterx-frontend/src/components/ui/Button.tsx

import React from 'react'

interface ButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
  variant?: 'primary' | 'secondary' | 'danger' | 'ghost'
  size?: 'sm' | 'md' | 'lg'
  loading?: boolean
  children: React.ReactNode
}

export const Button: React.FC<ButtonProps> = ({
  variant = 'primary',
  size = 'md',
  loading = false,
  children,
  className = '',
  disabled,
  ...props
}) => {
  const base =
    'inline-flex items-center justify-center font-medium rounded-xl transition-all duration-200 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-offset-slate-900 disabled:opacity-50 disabled:cursor-not-allowed'

  const variants = {
    primary:
      'bg-gradient-to-r from-indigo-600 to-violet-600 text-white hover:from-indigo-500 hover:to-violet-500 focus:ring-indigo-500 shadow-lg glow-indigo hover:scale-105 active:scale-95',
    secondary:
      'bg-slate-700 text-slate-100 hover:bg-slate-600 focus:ring-slate-500 border border-slate-600',
    danger:
      'bg-gradient-to-r from-rose-600 to-rose-500 text-white hover:from-rose-500 hover:to-rose-400 focus:ring-rose-500 shadow-lg',
    ghost:
      'bg-transparent text-slate-300 hover:bg-slate-800 hover:text-white focus:ring-slate-500 border border-transparent hover:border-slate-600',
  }

  const sizes = {
    sm: 'px-3 py-1.5 text-sm gap-1.5',
    md: 'px-4 py-2 text-sm gap-2',
    lg: 'px-6 py-3 text-base gap-2',
  }

  return (
    <button
      className={`${base} ${variants[variant]} ${sizes[size]} ${className}`}
      disabled={disabled || loading}
      {...props}
    >
      {loading && (
        <svg
          className="animate-spin h-4 w-4"
          xmlns="http://www.w3.org/2000/svg"
          fill="none"
          viewBox="0 0 24 24"
        >
          <circle
            className="opacity-25"
            cx="12"
            cy="12"
            r="10"
            stroke="currentColor"
            strokeWidth="4"
          />
          <path
            className="opacity-75"
            fill="currentColor"
            d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"
          />
        </svg>
      )}
      {children}
    </button>
  )
}