:root{--fitnfo-brand:#6d4aff;--fitnfo-brand-2:#8b6bff;--fitnfo-deep:#1e1b4b;--fitnfo-line:#e7e5ff;--fitnfo-ink:#0b1020}
.fitnfo-calc,.fitnfo-core-box{font-family:"Inter",system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
.fitnfo-calc{max-width:620px;margin:28px auto;background:#fff;border:1px solid var(--fitnfo-line);border-radius:24px;box-shadow:0 22px 60px rgba(11,16,32,.10);overflow:hidden}
.fitnfo-calc__head{padding:24px 28px;background:linear-gradient(135deg,#4f46e5,#7c3aed,#a855f7);color:#fff}
.fitnfo-calc__title{margin:0;color:#fff;font-size:1.35rem;font-weight:800}
.fitnfo-calc__sub{margin:6px 0 0;color:rgba(255,255,255,.85);font-size:.92rem}
.fitnfo-calc__body{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding:24px 28px}
.fitnfo-calc__field{display:flex;flex-direction:column;gap:6px}
.fitnfo-calc__field label{font-size:.8rem;font-weight:700;color:var(--fitnfo-deep);text-transform:uppercase;letter-spacing:.03em}
.fitnfo-calc__in{padding:11px 13px;border:1px solid var(--fitnfo-line);border-radius:12px;font-size:1rem;background:#fbfaff;color:var(--fitnfo-ink);transition:border-color .15s,box-shadow .15s}
.fitnfo-calc__in:focus{outline:none;border-color:var(--fitnfo-brand);box-shadow:0 0 0 3px rgba(109,74,255,.15)}
.fitnfo-calc__btn{display:block;width:calc(100% - 56px);margin:0 28px 24px;padding:14px 18px;border:0;border-radius:999px;background:linear-gradient(135deg,var(--fitnfo-brand),var(--fitnfo-brand-2));color:#fff;font-weight:800;font-size:1rem;cursor:pointer;transition:transform .12s,box-shadow .12s}
.fitnfo-calc__btn:hover{transform:translateY(-1px);box-shadow:0 12px 28px rgba(109,74,255,.35)}
.fitnfo-calc__btn:active{transform:translateY(0)}
.fitnfo-calc__result{margin:0 28px 28px;padding:20px 22px;border-radius:18px;background:linear-gradient(135deg,#f5f3ff,#eef2ff);border:1px solid var(--fitnfo-line);text-align:center}
.fitnfo-calc__value{font-size:2.1rem;font-weight:900;color:var(--fitnfo-deep);line-height:1.1}
.fitnfo-calc__unit{font-size:1rem;font-weight:700;color:var(--fitnfo-brand)}
.fitnfo-calc__note{margin:8px 0 0;color:#4b5563;font-size:.95rem}
.fitnfo-calc--missing{max-width:620px;margin:28px auto;padding:20px;border:1px dashed var(--fitnfo-line);border-radius:18px;text-align:center;color:#6b7280}
.fitnfo-calc__body input.is-error{border-color:#ef4444;box-shadow:0 0 0 3px rgba(239,68,68,.12)}
.fitnfo-core-box{max-width:760px;margin:28px auto;background:#fff;border:1px solid var(--fitnfo-line);border-radius:24px;box-shadow:0 22px 60px rgba(11,16,32,.10);overflow:hidden}
.fitnfo-core-box h3{margin:0;padding:24px 28px;background:linear-gradient(135deg,#4f46e5,#7c3aed,#a855f7);color:#fff}
.fitnfo-core-box .button{border-radius:999px;background:linear-gradient(135deg,var(--fitnfo-brand),var(--fitnfo-brand-2));color:#fff;font-weight:800;padding:10px 16px;text-decoration:none;display:inline-block}
@media(max-width:640px){.fitnfo-calc__body{grid-template-columns:1fr}.fitnfo-calc{margin:14px 8px}.fitnfo-calc__btn{width:calc(100% - 40px);margin:0 20px 20px}.fitnfo-calc__result{margin:0 20px 20px}}

/* ===== FitNFO unit toggle (kg/lb, cm/ft-in) ===== */
.fitnfo-calc__lbl{ display:flex; align-items:center; justify-content:space-between; gap:10px; flex-wrap:wrap; }
.fitnfo-unit-toggle{ display:inline-flex; border:1px solid #E5E7EB; border-radius:999px; overflow:hidden; background:#F9FAFB; }
.fitnfo-unit-btn{ border:0; background:transparent; padding:3px 12px; font-size:12px; font-weight:700; color:#6B7280; cursor:pointer; line-height:1.6; transition:all .15s; }
.fitnfo-unit-btn:hover{ color:#FF6B2C; }
.fitnfo-unit-btn.is-active{ background:#FF6B2C; color:#fff; }
.fitnfo-calc__ftin{ display:flex; align-items:center; gap:8px; }
.fitnfo-calc__ftin input{ flex:1; min-width:0; }
.fitnfo-calc__ftin-sep{ font-size:13px; font-weight:600; color:#6B7280; }