.bzg-r3{
  max-width: 980px;
  margin: 28px auto;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

.bzg-r3__head{
  text-align:center;
  padding: 18px 10px 10px;
}

.bzg-r3__head h2{
  margin: 0 0 6px;
  font-size: 1.5rem;
}

.bzg-r3__intro{
  margin: 0;
  opacity: .85;
  font-size: .95rem;
}

.bzg-r3__layout{
  display:grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 16px;
  align-items: stretch;
  padding: 14px;
}

.bzg-r3__panel,
.bzg-r3__resultCard{
  background:#fff;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,.08);
  padding: 18px;
}

.bzg-r3__ratio{
  display:flex;
  align-items:center;
  justify-content:center;
  gap: 16px;
  padding: 6px 0 14px;
}

.bzg-r3__frac{
  width: 180px;
  display:flex;
  flex-direction:column;
  gap: 8px;
}

.bzg-r3__frac input{
  width:100%;
  text-align:center;
  padding: 10px 10px;
  border-radius: 10px;
  border:1px solid #d1d5db;
  font-size: 1.05rem;
}

.bzg-r3__bar{
  height: 2px;
  background: #111827;
  opacity: .25;
  border-radius: 999px;
}

.bzg-r3__eq{
  font-size: 1.4rem;
  opacity: .7;
}

.bzg-r3__xbox{
  width:100%;
  text-align:center;
  padding: 10px 10px;
  border-radius: 10px;
  border: 1px dashed #9ca3af;
  background: #f8fafc;
  font-size: 1.05rem;
  font-weight: 700;
  color:#64748b;
  text-transform: uppercase;
}

.bzg-r3__controls{
  display:flex;
  flex-wrap:wrap;
  gap: 10px;
  justify-content:center;
  align-items:flex-end;
  margin-top: 6px;
}

.bzg-r3__label{
  display:flex;
  flex-direction:column;
  gap: 6px;
  font-size: .9rem;
  opacity: .9;
}

.bzg-r3__label select{
  min-width: 160px;
  padding: 10px 10px;
  border-radius: 10px;
  border:1px solid #d1d5db;
  background:#fff;
}

.bzg-r3__btn{
  padding: 11px 14px;
  border-radius: 10px;
  border: none;
  background: #2563eb;
  color:#fff;
  cursor:pointer;
  font-weight: 700;
}

.bzg-r3__btn:hover{
  background:#1d4ed8;
}

.bzg-r3__btn--ghost{
  background: #eef2ff;
  color: #1d4ed8;
}

.bzg-r3__btn--ghost:hover{
  background:#e0e7ff;
}

.bzg-r3__hint{
  margin-top: 12px;
  background:#f1f5f9;
  border-radius: 12px;
  padding: 12px;
  font-size: .92rem;
  opacity: .95;
}

.bzg-r3__mono{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.bzg-r3__resultCard{
  border: 1px solid rgba(37, 99, 235, .25);
  background: rgba(37, 99, 235, .06);
}

.bzg-r3__resultTop{
  display:flex;
  justify-content:space-between;
  align-items:baseline;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(37, 99, 235, .20);
  margin-bottom: 12px;
}

.bzg-r3__resultLabel{
  font-size: .85rem;
  opacity: .8;
  text-transform: uppercase;
  letter-spacing: .06em;
}

.bzg-r3__resultValue{
  font-size: 1.15rem;
}

.bzg-r3__resultValue strong{
  font-size: 1.4rem;
}

.bzg-r3__formulaTitle{
  font-size: .78rem;
  letter-spacing: .06em;
  opacity: .75;
  font-weight: 700;
  margin-bottom: 10px;
}

.bzg-r3__formula{
  font-size: .95rem;
}

@media (max-width: 860px){
  .bzg-r3__layout{
    grid-template-columns: 1fr;
  }
  .bzg-r3__frac{
    width: 160px;
  }
}

.bzg-r3__cap{font-size:.78rem;opacity:.7;text-align:center;line-height:1.1}