body{font-family:Arial,sans-serif;margin:0}nav{display:flex;justify-content:space-between;padding:1rem;background:#0b1f3a;color:#fff}.hero{padding:2rem;background:#eef}form{display:flex;flex-direction:column;gap:.5rem;max-width:400px}button{padding:.7rem}@media(max-width:768px){nav{flex-direction:column}}