body{margin:0;background:linear-gradient(145deg,#eef2ff,#f8fafc);font:15px/1.5 system-ui;color:#172033}main{max-width:620px;margin:40px auto;padding:16px}h1{text-align:center}.card{background:#fff;border:1px solid #e2e8f0;border-radius:14px;padding:20px;margin:14px 0;box-shadow:0 12px 30px #10204010}label{display:block;margin:12px 0}input,select{display:block;width:100%;box-sizing:border-box;padding:10px;border:1px solid #ccd3df;border-radius:8px}label input[type=checkbox]{display:inline;width:auto}button{width:100%;padding:11px;border:0;border-radius:9px;background:#3157d5;color:#fff;font-weight:700}.hidden{display:none}pre{white-space:pre-wrap;background:#101828;color:#fff;padding:12px;border-radius:9px}#msg{color:#b42318;font-weight:700}