.vbcalc { max-width: 760px; margin: 0 auto; border: 1px solid #eee; padding: 16px; border-radius: 14px; }
.vbcalc h3 { margin: 0 0 10px 0; }
.vbcalc h4 { margin: 12px 0 8px; }
.vbcalc .hint { color: #666; font-size: .95rem; }
.vbcalc .row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.vbcalc label { display: block; font-weight: 600; margin-bottom: 6px; }
.vbcalc input[type="number"], .vbcalc input[type="text"], .vbcalc input[type="email"] { width: 100%; padding: 8px; border: 1px solid #ddd; border-radius: 8px; }
.vbcalc .options { display: flex; flex-direction: column; gap: 8px; }
.vbcalc .radios { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.vbcalc .card { border: 1px solid #e6e8ec; border-radius: 10px; padding: 10px; }
.vbcalc .actions { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.vbcalc button, .vbcalc a.button { padding: 10px 14px; border: 0; border-radius: 10px; cursor: pointer; display: inline-block; text-decoration: none; }
.vbcalc .primary { background: #2E86C1; color: #fff; }
.vbcalc .secondary { background: #eee; }
.vbcalc .hidden { display: none; }
.vbcalc .result-box { background: #f8f9fb; border: 1px solid #e6e8ec; padding: 14px; border-radius: 12px; }
.vbcalc small.muted { color: #666; }
@media(max-width:680px){
  .vbcalc .row, .vbcalc .radios { grid-template-columns: 1fr; }
}