:root{--primary-color:#4CAF50;--secondary-color:#45a049}body{font-family:Arial,sans-serif;line-height:1.6;color:#333;max-width:800px;margin:0 auto;padding:20px}header{background-color:var(--primary-color);padding:1rem;position:sticky;top:0;z-index:1000}nav{display:flex;justify-content:space-around}nav a{color:#fff;text-decoration:none}.content-section{margin-bottom:2rem;padding:2rem;background-color:#f9f9f9;border-radius:5px}form{display:grid;gap:1rem}input,textarea{width:100%;padding:.5rem}button{background-color:var(--primary-color);color:#fff;border:none;padding:.5rem 1rem;cursor:pointer}button:hover{background-color:var(--secondary-color)}.highlight-box{background-color:var(--primary-color);color:#fff;padding:1rem;margin:1rem 0;border-radius:5px}.challenges{background-color:#ffebee;padding:1rem;border-left:5px solid #f44336;margin:1rem 0}.timeline{position:relative;padding-left:2rem}.timeline::before{content:'';position:absolute;left:0;top:0;bottom:0;width:2px;background-color:var(--primary-color)}.event{margin-bottom:1.5rem;position:relative}.event::before{content:'';position:absolute;left:-2.5rem;top:.5rem;width:1rem;height:1rem;background-color:var(--primary-color);border-radius:50%}.event-date{font-weight:700;color:var(--primary-color)}.event-content{margin-top:.5rem}