body{font-family:system-ui,sans-serif;max-width:760px;margin:0 auto;padding:16px;line-height:1.55;color:#222}
header{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;border-bottom:1px solid #ddd;padding-bottom:8px}
nav a{margin-right:12px}.box{background:#fff4d6;border:1px solid #e0c36a;padding:8px 16px}
label{display:block;margin:8px 0}input,textarea{display:block;width:100%;box-sizing:border-box}
footer{border-top:1px solid #ddd;margin-top:32px;color:#666}