body{font-family:Arial,Helvetica,sans-serif;max-width:1000px;margin:0 auto;padding:20px}footer,header{text-align:center;padding:10px;margin:10px 0}nav{margin:10px 0}nav a{margin:0 5px}main{min-height:400px;padding:20px 0}h1,h2,h3{margin-bottom:15px}ul{padding-left:20px}form{display:flex;flex-direction:column;max-width:400px;margin:0 auto}button,input{margin-bottom:10px;padding:8px}button{background-color:#0066cc;color:white;border:none;cursor:pointer}a{color:#0066cc;text-decoration:none}a:hover{text-decoration:underline}.card{border:1px solid #ddd;padding:15px;margin-bottom:15px;border-radius:5px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:15px}