body{font-family:Arial, sans-serif;background:#f6f7fb;margin:0}
.container{max-width:860px;margin:40px auto;background:#fff;padding:24px;border:1px solid #e6e6e6}
label{display:block;margin-top:12px;font-weight:600}
input,select,textarea{width:100%;padding:10px;margin-top:6px;border:1px solid #ccc;border-radius:4px;box-sizing:border-box}
button{margin-top:16px;padding:10px 18px}
.err{background:#fee;border:1px solid #f99;padding:12px}
.ok{background:#efe;border:1px solid #9f9;padding:12px}
.nav a{margin-right:12px}