Index: chapterx-frontend/src/components/ui/Modal.tsx
===================================================================
--- chapterx-frontend/src/components/ui/Modal.tsx	(revision b62cefc14094ca5ac7154f7d48797a1e6c444935)
+++ chapterx-frontend/src/components/ui/Modal.tsx	(revision b62cefc14094ca5ac7154f7d48797a1e6c444935)
@@ -0,0 +1,68 @@
+import React, { useEffect } from 'react'
+import { X } from 'lucide-react'
+
+interface ModalProps {
+  isOpen: boolean
+  onClose: () => void
+  title?: string
+  children: React.ReactNode
+  size?: 'sm' | 'md' | 'lg' | 'xl'
+}
+
+const sizeMap = {
+  sm: 'max-w-sm',
+  md: 'max-w-md',
+  lg: 'max-w-lg',
+  xl: 'max-w-2xl',
+}
+
+export const Modal: React.FC<ModalProps> = ({
+  isOpen,
+  onClose,
+  title,
+  children,
+  size = 'md',
+}) => {
+  useEffect(() => {
+    const handler = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') onClose()
+    }
+    if (isOpen) document.addEventListener('keydown', handler)
+    return () => document.removeEventListener('keydown', handler)
+  }, [isOpen, onClose])
+
+  if (!isOpen) return null
+
+  return (
+    <div className="fixed inset-0 z-50 flex items-center justify-center p-4">
+      <div
+        className="absolute inset-0 bg-black/70 backdrop-blur-sm"
+        onClick={onClose}
+      />
+      <div
+        className={`relative w-full ${sizeMap[size]} bg-slate-900 border border-slate-700 rounded-2xl shadow-2xl z-10 max-h-[90vh] overflow-y-auto`}
+      >
+        {title && (
+          <div className="flex items-center justify-between p-6 border-b border-slate-700">
+            <h2 className="text-lg font-semibold text-white font-serif">{title}</h2>
+            <button
+              onClick={onClose}
+              className="p-1.5 text-slate-400 hover:text-white hover:bg-slate-700 rounded-lg transition-colors"
+            >
+              <X size={18} />
+            </button>
+          </div>
+        )}
+        {!title && (
+          <button
+            onClick={onClose}
+            className="absolute top-4 right-4 p-1.5 text-slate-400 hover:text-white hover:bg-slate-700 rounded-lg transition-colors z-10"
+          >
+            <X size={18} />
+          </button>
+        )}
+        <div className="p-6">{children}</div>
+      </div>
+    </div>
+  )
+}