body{font-family:Segoe UI,sans-serif;margin:0;line-height:1.6}header{background:#222;color:#fff;padding:1rem}nav a{color:#fff;margin-right:1rem;text-decoration:none}nav a[aria-current=page]{text-decoration:underline}main{padding:1rem;max-width:700px;margin:auto}input,textarea{padding:1em;border-radius:10px;outline:none;border:solid gray 2px}.form-group{margin-bottom:1rem;display:flex;flex-direction:column}.error{color:red;font-size:.9rem}form button{padding:1em;border-radius:10px;background-color:#1d1d1d;font-weight:700;color:#fff;outline:none;border:none;cursor:pointer}.success{color:green;font-weight:700}@media(max-width:600px){body{padding:.5rem}}