*{box-sizing:border-box}body{max-width:600px;margin:0 auto;padding:20px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.app h1{color:#333;margin-bottom:20px}.people-section{background:#f5f5f5;border-radius:8px;margin-bottom:20px;padding:20px}.people-section h2{color:#555;margin-top:0}.person-form{gap:10px;margin-bottom:15px;display:flex}.person-form input{border:1px solid #ddd;border-radius:4px;flex:1;padding:10px;font-size:16px}.person-form button{color:#fff;cursor:pointer;background:#007bff;border:none;border-radius:4px;padding:10px 20px;font-size:16px}.person-form button:hover{background:#0056b3}.error{color:#dc3545;margin:10px 0 0;font-size:14px}.people-list{margin:0;padding:0;list-style:none}.people-list li{background:#fff;border-radius:4px;margin-bottom:5px;padding:10px}.empty-state{color:#666;font-style:italic}