.bhcb{--ink:#17212b;--muted:#63707b;--line:#d8e0e5;--soft:#f6f8fa;--accent:#9e2f2f;--accent-dark:#772020;max-width:1050px;margin:32px auto;color:var(--ink);font-family:inherit}
.bhcb *{box-sizing:border-box}
.bhcb-heading{max-width:800px;margin-bottom:22px}
.bhcb-heading h2{font-size:clamp(2rem,5vw,3rem);line-height:1.08;margin:7px 0 10px}
.bhcb-heading p{font-size:1.05rem;line-height:1.65;color:var(--muted)}
.bhcb-kicker{display:block;color:var(--accent);font-size:.78rem;font-weight:850;letter-spacing:.08em;text-transform:uppercase}
.bhcb-grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(300px,.8fr);gap:22px;align-items:start}
.bhcb-card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:clamp(20px,4vw,30px);box-shadow:0 12px 30px rgba(20,30,40,.07)}
.bhcb-card h3{margin:5px 0 20px;font-size:1.5rem}
.bhcb-fields{display:grid;grid-template-columns:1fr 1fr;gap:17px}
.bhcb-fields label{font-weight:750}
.bhcb-fields input{width:100%;min-height:49px;margin-top:7px;padding:10px 12px;border:1px solid #aeb9c2;border-radius:10px;background:#fff;color:var(--ink);font:inherit}
.bhcb-fields input:focus{outline:3px solid rgba(158,47,47,.15);border-color:var(--accent)}
.bhcb-fields small{display:block;margin-top:6px;color:var(--muted);font-weight:400;line-height:1.35}
.bhcb-money{display:flex;align-items:center;margin-top:7px;border:1px solid #aeb9c2;border-radius:10px;overflow:hidden}
.bhcb-money:focus-within{outline:3px solid rgba(158,47,47,.15);border-color:var(--accent)}
.bhcb-money b{align-self:stretch;display:flex;align-items:center;padding:0 13px;background:var(--soft)}
.bhcb-money input{margin:0;border:0;border-radius:0}
.bhcb-money input:focus{outline:0}
.bhcb-actions{display:flex;gap:10px;margin-top:22px}
.bhcb-primary,.bhcb-secondary{min-height:48px;padding:10px 18px;border-radius:10px;font:inherit;font-weight:800;cursor:pointer}
.bhcb-primary{background:var(--accent);border:1px solid var(--accent);color:#fff}
.bhcb-primary:hover{background:var(--accent-dark)}
.bhcb-secondary{background:#fff;border:1px solid var(--line);color:var(--ink)}
.bhcb-results{position:sticky;top:22px;background:var(--ink);color:#fff}
.bhcb-results p{line-height:1.65;color:#e5eaed}
.bhcb-amount{font-size:clamp(2.2rem,6vw,3.5rem);font-weight:900;margin:8px 0}
.bhcb-per-unit{display:inline-block;margin:4px 0 15px;padding:7px 11px;border-radius:999px;background:rgba(255,255,255,.13);font-weight:800}
.bhcb-breakdown{margin-top:18px;border-top:1px solid rgba(255,255,255,.2);padding-top:12px}
.bhcb-breakdown div{display:flex;justify-content:space-between;gap:20px;padding:7px 0}
.bhcb-breakdown span{color:#dbe1e5}
.bhcb-explain{margin-top:17px;padding:14px;border-radius:10px;background:rgba(255,255,255,.09);line-height:1.55}
.bhcb-error{margin-top:17px;padding:12px 14px;background:#fff0ef;color:#842018;border-left:4px solid #b42318;border-radius:8px}
.bhcb-formula,.bhcb-disclaimer{margin-top:20px;padding:17px 19px;border-radius:12px;line-height:1.6}
.bhcb-formula{display:flex;justify-content:space-between;gap:20px;background:#f7f3eb}
.bhcb-disclaimer{background:var(--soft);border-left:5px solid var(--accent)}
@media(max-width:780px){.bhcb-grid{grid-template-columns:1fr}.bhcb-results{position:static}.bhcb-fields{grid-template-columns:1fr}}
@media(max-width:520px){.bhcb-actions,.bhcb-formula{flex-direction:column}.bhcb-primary,.bhcb-secondary{width:100%}}