cha-portal{max-width:460px;margin:18px auto;padding:18px;border-radius:10px;background:#fff;box-shadow:0 4px 18px rgba(0,0,0,0.06);font-family:Inter,Arial,Helvetica,sans-serif}
.cha-portal label{display:block;margin-bottom:8px;font-weight:600;color:#222}
.cha-portal input{width:100%;padding:10px;margin-top:6px;border:1px solid #e2e2e2;border-radius:8px;box-sizing:border-box;font-size:16px}
.cha-btn{display:inline-block;padding:10px 16px;border:none;border-radius:8px;background:#0073aa;color:#fff;cursor:pointer;font-weight:700}
.cha-btn:hover{background:#005177}
.cha-root{margin-top:14px;text-align:center}
@media(max-width:480px){
  .cha-portal{width:94%;padding:14px;margin:10px auto}
  .cha-portal input{font-size:17px}
}