*{box-sizing:border-box}
body{margin:0;min-height:100vh;display:flex;align-items:center;justify-content:center;font-family:Arial,sans-serif;background:#f5f5f5;color:#111}
.box{width:min(720px,calc(100% - 32px));padding:32px;background:#fff;border:1px solid #ddd;border-radius:12px}
.center{text-align:center} h1{margin-top:0}.subtitle{color:#777}.actions{display:grid;gap:12px;margin:28px 0}
a{color:#111}.button{display:inline-block;width:100%;padding:12px 16px;border-radius:7px;background:#111;color:#fff;text-align:center;text-decoration:none;cursor:pointer;font-size:16px;border:0}
.button.secondary{background:#666}h2{font-size:20px;margin-top:30px}
label{display:block;margin:14px 0;font-weight:bold}input,textarea{display:block;width:100%;margin-top:6px;padding:10px;border:1px solid #bbb;border-radius:6px;font:inherit}
.error{padding:10px;margin:12px 0;background:#fee;border:1px solid #eaa;border-radius:6px}.chat{margin:20px 0}
.message{padding:14px 0;border-bottom:1px solid #ddd}.attachment{margin-top:10px;padding:8px;background:#f5f5f5;border-radius:5px}