:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:#172033;background:#f4f7fb;color-scheme:light}*{box-sizing:border-box}body{margin:0;min-height:100vh;display:grid;place-items:center;padding:24px;background:linear-gradient(145deg,#edf6ff,#f8f6ff 55%,#f5f7fb)}main{width:min(580px,100%)}.back{display:inline-block;color:#60728b;text-decoration:none;margin-bottom:24px;font-size:14px}.card{padding:38px;background:white;border:1px solid #e5eaf2;border-radius:22px;box-shadow:0 14px 40px #263f6910}.eyebrow{font-weight:600;color:#3479da;font-size:14px}h1{font-size:clamp(24px,5vw,32px);margin:14px 0;letter-spacing:-.03em}.intro{color:#64748b;margin:0 0 30px;line-height:1.6}label{display:block;font-size:14px;font-weight:600;margin-bottom:10px}input{display:block;width:100%;padding:15px 14px;border:1px solid #cdd7e4;border-radius:10px;font:16px ui-monospace,SFMono-Regular,Consolas,monospace;color:#172033;outline:none}input:focus{border-color:#3987e8;box-shadow:0 0 0 3px #3987e81c}input[aria-invalid=true]{border-color:#d33}#hint,.note{font-size:13px;color:#718096;line-height:1.7}#error{color:#ba2424;font-size:14px;line-height:1.6}button{width:100%;border:0;border-radius:10px;background:#347fe0;color:white;cursor:pointer;font-size:16px;font-weight:600;padding:15px;margin-top:12px;display:flex;justify-content:space-between}button:hover{background:#286dcc}button:disabled{opacity:.65;cursor:wait}.note{margin:22px 0 0}@media(max-width:480px){body{padding:18px}.card{padding:28px 22px}}