Frontends/cnn/src/components/ui/PanelContainer.tsx

import React, { ReactNode, useEffect, useRef, useState } from 'react';

interface PanelContainerProps {
  title: string;
  children: ReactNode;
  description: string;
  panelNumber: number;
}

const PanelContainer: React.FC<PanelContainerProps> = ({ 
  title, 
  children, 
  description,
  panelNumber 
}) => {
  const [isVisible, setIsVisible] = useState(false);
  const panelRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const observer = new IntersectionObserver(
      ([entry]) => {
        if (entry.isIntersecting) {
          setIsVisible(true);
        }
      },
      {
        root: null,
        rootMargin: '0px',
        threshold: 0.3,
      }
    );

    if (panelRef.current) {
      observer.observe(panelRef.current);
    }

    return () => {
      if (panelRef.current) {
        observer.unobserve(panelRef.current);
      }
    };
  }, []);

  return (
    <section 
      ref={panelRef}
      className={`min-h-screen py-16 px-4 md:px-8 flex flex-col justify-center transition-opacity duration-1000 ease-in-out ${
        isVisible ? 'opacity-100' : 'opacity-0'
      }`}
    >
      <div className="relative">
        <div className="absolute -left-16 top-2 hidden md:flex items-center justify-center w-12 h-12 rounded-full bg-gradient-to-r from-blue-600 to-purple-600 text-white font-bold text-xl">
          {panelNumber}
        </div>
      </div>
      
      <h2 className="text-3xl md:text-4xl font-bold mb-6 text-transparent bg-clip-text bg-gradient-to-r from-cyan-400 to-blue-500">
        {title}
      </h2>
      
      <p className="mb-8 text-gray-300 max-w-2xl">{description}</p>
      
      <div className="bg-gray-800 border border-gray-700 rounded-xl p-6 shadow-lg shadow-purple-900/10">
        {children}
      </div>
    </section>
  );
};

export default PanelContainer;