body{margin:0;background:#f5f8fb;color:#14213d;font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
main{max-width:760px;margin:0 auto;padding:20px 18px 40px;background:#fff;min-height:100vh;box-sizing:border-box}
h1{font-size:1.5em;line-height:1.3}
h2{font-size:1.15em;margin-top:28px;border-bottom:1px solid #dfe6ee;padding-bottom:4px}
i{color:#4a5568}
.muted{color:#5f6b7a;font-size:.92em}
a{color:#0f9d8a}
code{background:#f0f3f7;padding:1px 5px;border-radius:4px}
form{margin:20px 0;padding:16px;border:1px solid #dfe6ee;border-radius:12px;background:#fbfcfd}
label{display:block;margin-bottom:12px;font-weight:600}
input{display:block;width:100%;box-sizing:border-box;margin-top:4px;padding:10px;border:1px solid #c9d3de;border-radius:8px;font:inherit}
button{width:100%;padding:11px;border:0;border-radius:8px;background:#d62839;color:#fff;font:inherit;font-weight:600;cursor:pointer}
button:disabled{opacity:.6}
.msg{margin:12px 0 0;color:#d62839;font-weight:600}
.msg.ok{color:#0f9d8a}