experiments-database/frontend/src/components/ui/Modal.jsx

import React, { useEffect } from 'react';

export default function Modal({ isOpen, onClose, title, children, size = 'md' }) {
  useEffect(() => {
    if (!isOpen) return;
    const handleKey = (e) => { if (e.key === 'Escape') onClose(); };
    document.addEventListener('keydown', handleKey);
    return () => document.removeEventListener('keydown', handleKey);
  }, [isOpen, onClose]);

  if (!isOpen) return null;

  const widths = { sm: 'max-w-md', md: 'max-w-lg', lg: 'max-w-2xl', xl: 'max-w-4xl' };

  return (
    <div
      className="fixed inset-0 z-50 flex items-center justify-center bg-black/40 backdrop-blur-sm"
      onClick={(e) => { if (e.target === e.currentTarget) onClose(); }}
      role="dialog"
      aria-modal="true"
      aria-labelledby="modal-title"
    >
      <div className={`bg-white rounded-xl shadow-2xl w-full mx-4 ${widths[size]} max-h-[90vh] flex flex-col`}>
        <div className="flex items-center justify-between px-6 py-4 border-b border-gray-200">
          <h2 id="modal-title" className="text-lg font-semibold text-gray-900">{title}</h2>
          <button
            onClick={onClose}
            className="text-gray-400 hover:text-gray-600 rounded p-1 transition-colors"
            aria-label="Close modal"
          >
            <svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
            </svg>
          </button>
        </div>
        <div className="p-6 overflow-y-auto flex-1">{children}</div>
      </div>
    </div>
  );
}