*{box-sizing:border-box}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;margin:0;background:#f6f7fb;color:#1f2430;line-height:1.5}
.hero{background:#091429;color:#fff;padding:36px 16px;text-align:center}
main{max-width:1000px;margin:0 auto;padding:16px}
.sell{background:#fff;padding:16px;border-radius:12px;box-shadow:0 4px 12px rgba(0,0,0,.06);margin:16px 0}
label{display:block;margin:10px 0 6px}
input{width:100%;padding:10px;border:1px solid #d6dae5;border-radius:8px}
button,.btn{background:#0073e6;color:#fff;border:none;padding:12px 16px;border-radius:10px;cursor:pointer;text-decoration:none;display:inline-block}
button:hover,.btn:hover{opacity:.9}
#qrcode img{max-width:280px}
.footer{padding:24px 16px;text-align:center;color:#616b7a}
.footer a{color:#0073e6;text-decoration:none}