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frontend/src/components/ui/Button.tsx

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+import { forwardRef, type ButtonHTMLAttributes } from 'react'
+import { clsx } from 'clsx'
+import { Loader2 } from 'lucide-react'
+
+interface ButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  variant?: 'primary' | 'secondary' | 'danger' | 'ghost'
+  size?: 'sm' | 'md' | 'lg'
+  isLoading?: boolean
+}
+
+export const Button = forwardRef<HTMLButtonElement, ButtonProps>(
+  ({ className, variant = 'primary', size = 'md', isLoading, children, disabled, ...props }, ref) => {
+    return (
+      <button
+        ref={ref}
+        disabled={disabled || isLoading}
+        className={clsx(
+          'inline-flex items-center justify-center font-medium rounded-lg transition-colors',
+          'disabled:opacity-50 disabled:cursor-not-allowed',
+          {
+            'bg-primary-600 hover:bg-primary-700 text-white': variant === 'primary',
+            'bg-gray-700 hover:bg-gray-600 text-white': variant === 'secondary',
+            'bg-red-600 hover:bg-red-700 text-white': variant === 'danger',
+            'bg-transparent hover:bg-gray-800 text-gray-300': variant === 'ghost',
+            'px-3 py-1.5 text-sm': size === 'sm',
+            'px-4 py-2 text-base': size === 'md',
+            'px-6 py-3 text-lg': size === 'lg',
+          },
+          className
+        )}
+        {...props}
+      >
+        {isLoading && <Loader2 className="w-4 h-4 mr-2 animate-spin" />}
+        {children}
+      </button>
+    )
+  }
+)
+
+Button.displayName = 'Button'