initial

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'

frontend/src/components/ui/Card.tsx

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+import { type ReactNode } from 'react'
+import { clsx } from 'clsx'
+
+interface CardProps {
+  children: ReactNode
+  className?: string
+}
+
+export function Card({ children, className }: CardProps) {
+  return (
+    <div className={clsx('bg-gray-800 rounded-xl p-6 shadow-lg', className)}>
+      {children}
+    </div>
+  )
+}
+
+interface CardHeaderProps {
+  children: ReactNode
+  className?: string
+}
+
+export function CardHeader({ children, className }: CardHeaderProps) {
+  return (
+    <div className={clsx('mb-4', className)}>
+      {children}
+    </div>
+  )
+}
+
+interface CardTitleProps {
+  children: ReactNode
+  className?: string
+}
+
+export function CardTitle({ children, className }: CardTitleProps) {
+  return (
+    <h3 className={clsx('text-xl font-bold text-white', className)}>
+      {children}
+    </h3>
+  )
+}
+
+interface CardContentProps {
+  children: ReactNode
+  className?: string
+}
+
+export function CardContent({ children, className }: CardContentProps) {
+  return (
+    <div className={clsx('text-gray-300', className)}>
+      {children}
+    </div>
+  )
+}

frontend/src/components/ui/Input.tsx

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+import { forwardRef, type InputHTMLAttributes } from 'react'
+import { clsx } from 'clsx'
+
+interface InputProps extends InputHTMLAttributes<HTMLInputElement> {
+  label?: string
+  error?: string
+}
+
+export const Input = forwardRef<HTMLInputElement, InputProps>(
+  ({ className, label, error, id, ...props }, ref) => {
+    return (
+      <div className="w-full">
+        {label && (
+          <label htmlFor={id} className="block text-sm font-medium text-gray-300 mb-1">
+            {label}
+          </label>
+        )}
+        <input
+          ref={ref}
+          id={id}
+          className={clsx(
+            'w-full px-4 py-2 bg-gray-800 border rounded-lg text-white placeholder-gray-500',
+            'focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent',
+            'transition-colors',
+            error ? 'border-red-500' : 'border-gray-700',
+            className
+          )}
+          {...props}
+        />
+        {error && <p className="mt-1 text-sm text-red-500">{error}</p>}
+      </div>
+    )
+  }
+)
+
+Input.displayName = 'Input'

frontend/src/components/ui/index.ts

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+export { Button } from './Button'
+export { Input } from './Input'
+export { Card, CardHeader, CardTitle, CardContent } from './Card'