.fpfac-calculator{max-width:700px;margin:auto;padding:20px;font-family:Arial,sans-serif;color:#222}
.fpfac-calculator label{display:block;margin:15px 0;font-weight:600}
.fpfac-calculator input{width:100%;padding:12px;border:1px solid #ccc;border-radius:10px;box-sizing:border-box;margin-top:6px}
.buttons{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
button{padding:12px 16px;border:0;border-radius:8px;cursor:pointer}
.result{margin-top:25px;padding:20px;border-radius:12px;background:#f3f4f6;box-shadow:0 3px 12px #0001}
#output{font-size:28px;font-weight:bold}
@media(max-width:600px){button{width:100%}}