.ibcalc{--ink:#062a31;--deep:#002b33;--sea:#d9ebe5;--ice:#eef4ef;--paper:#f6f7f1;--line:#b8cac4;--accent:#85c9bd;--danger:#9b2c2c;color:var(--ink);font-family:inherit;max-width:1080px;margin:0 auto 4rem;line-height:1.55}.ibcalc *{box-sizing:border-box}.ibcalc__intro,.ibcalc__method,.ibcalc__sources{max-width:820px;margin:2rem auto;padding:0 1rem}.ibcalc h2{font-size:clamp(1.75rem,4vw,3.1rem);line-height:1.03;letter-spacing:-.035em;margin:.35rem 0 1rem}.ibcalc__eyebrow{font-size:.72rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase}.ibcalc__boundary,.ibcalc__note{border-left:3px solid var(--accent);background:var(--ice);padding:1rem 1.1rem}.ibcalc__shell{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(300px,.9fr);gap:1.25rem;margin:2rem 0;padding:clamp(1rem,3vw,2rem);background:var(--deep);align-items:start}.ibcalc__form,.ibcalc__results{background:var(--paper);padding:clamp(1rem,3vw,2rem);border:1px solid rgba(255,255,255,.25)}.ibcalc__units{border:0;padding:0;margin:0 0 1.5rem;display:flex;gap:1rem;flex-wrap:wrap}.ibcalc__units legend{font-weight:700;margin-bottom:.55rem;width:100%}.ibcalc__units label{display:flex;align-items:center;gap:.45rem}.ibcalc__units input{accent-color:var(--deep)}.ibcalc__grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.ibcalc__field label{display:block;font-weight:700;margin-bottom:.35rem}.ibcalc__field input{width:100%;border:1px solid #78928b;background:#fff;color:var(--ink);font:inherit;padding:.75rem .8rem;border-radius:0}.ibcalc__field input:focus,.ibcalc button:focus,.ibcalc summary:focus,.ibcalc a:focus{outline:3px solid #f1b24b;outline-offset:2px}.ibcalc__field input[aria-invalid=true]{border:2px solid var(--danger)}.ibcalc__field small{display:block;margin-top:.3rem;color:#415e59;font-size:.78rem}.ibcalc__field-error{display:block;color:var(--danger);font-size:.8rem;font-weight:700;min-height:1.25rem;margin-top:.2rem}.ibcalc__error-summary{background:#fff0f0;border-left:4px solid var(--danger);padding:.8rem 1rem;margin-bottom:1rem;font-weight:700}.ibcalc__actions{display:flex;gap:.7rem;align-items:center;flex-wrap:wrap;margin-top:.7rem}.ibcalc button{border:1px solid var(--ink);font:inherit;font-weight:700;padding:.78rem 1rem;cursor:pointer}.ibcalc__primary{background:var(--ink);color:#fff}.ibcalc__primary:hover{background:#17434a}.ibcalc__secondary{background:transparent;color:var(--ink)}.ibcalc__secondary:hover{background:var(--sea)}.ibcalc__results{position:sticky;top:1rem}.ibcalc__results h2 strong{display:block;color:var(--ink)}.ibcalc__result-cards{display:grid;grid-template-columns:1fr;gap:.55rem;margin:1rem 0}.ibcalc__result-cards>div{display:flex;justify-content:space-between;gap:1rem;border-bottom:1px solid var(--line);padding:.65rem 0}.ibcalc__result-cards span{font-size:.85rem}.ibcalc details{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:.9rem 0;margin:1rem 0}.ibcalc summary{font-weight:700;cursor:pointer}.ibcalc__math dl{margin:1rem 0 0}.ibcalc__math dl>div{padding:.55rem 0;border-top:1px solid #d5dfda}.ibcalc__math dt{font-weight:700;font-size:.82rem}.ibcalc__math dd{margin:.15rem 0 0;font-size:.82rem}.ibcalc__method{background:var(--sea);padding:clamp(1.25rem,4vw,2.5rem);max-width:900px}.ibcalc__method ol{padding-left:1.25rem}.ibcalc code{white-space:normal;background:rgba(255,255,255,.55);padding:.1rem .25rem}.ibcalc__sources a{color:var(--ink);text-decoration-thickness:1px;text-underline-offset:3px}.ibcalc [hidden]{display:none!important}@media(max-width:780px){.ibcalc__shell{grid-template-columns:1fr;margin-left:0;margin-right:0}.ibcalc__results{position:static}.ibcalc__grid{grid-template-columns:1fr}.ibcalc__intro,.ibcalc__method,.ibcalc__sources{padding-left:.75rem;padding-right:.75rem}.ibcalc__result-cards>div{align-items:flex-end}.ibcalc__result-cards strong{text-align:right}}@media(prefers-reduced-motion:no-preference){.ibcalc button{transition:background-color .15s ease,color .15s ease}}@media print{.ibcalc__form,.ibcalc__intro,.ibcalc__method,.ibcalc__sources,.ibcalc__result-actions{display:none!important}.ibcalc__shell{display:block;background:#fff;padding:0}.ibcalc__results{display:block!important;border:0;position:static}.ibcalc__results details{display:block}.ibcalc__results details>*{display:block}.ibcalc a{color:#000}}