.stlc-card {
  max-width: 640px;
  margin-top: 1.5rem;
}
.stlc-divider {
  border: none;
  border-top: 1px solid #ccc;
  margin: 1.4rem 0;
}
.stlc-section-label {
  font-family: monospace;
  font-size: 1.25rem;
  letter-spacing: 0.18em;
  color: #4b900e;
  margin-bottom: 1rem;
}
.stlc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem 1.6rem;
  margin-bottom: 1.2rem;
}
.stlc-field {
  display: flex;
  flex-direction: column;
  gap: 0.38rem;
}
.stlc-field label {
  font-family: monospace;
  font-size: 1rem;
  letter-spacing: 0.08em;
}
.stlc-field label .unit {
  font-size: 0.9rem;
  opacity: 0.99;
  margin-left: 0.3em;
}
.stlc-field input,
.stlc-field select {
  border: 1px solid #999;
  border-radius: 3px;
  font-family: monospace;
  font-size: 0.85rem;
  padding: 0.52rem 0.7rem;
  width: 100%;
}
.stlc-btn-row {
  margin-top: 1.8rem;
  display: flex;
  align-items: center;
  gap: 1.2rem;
}
#stlcCalcBtn {
  font-family: monospace;
  font-size: 0.88rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  min-width: 10rem;
  padding: 0.75rem 0.5rem;
  border-radius: 5px;
  cursor: pointer;
  white-space: nowrap;
}
#stlcCalcBtn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.stlc-result-block {
  flex: 1;
  border: 1px solid #999;
  border-radius: 3px;
  padding: 0.65rem 1rem;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}
.stlc-result-label {
  font-family: monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  white-space: nowrap;
}
#cpwImpedanceOutput {
  font-family: monospace;
  font-size: 1.45rem;
  letter-spacing: 0.04em;
  min-width: 5ch;
}
.stlc-result-unit {
  font-family: monospace;
  font-size: 0.75rem;
}
.stlc-debug {
  margin-top: 1rem;
  font-family: monospace;
  font-size: 0.7rem;
  opacity: 0.55;
  background: #f0f0f0;
  border: 1px solid #ccc;
  border-radius: 3px;
  padding: 0.6rem 0.8rem;
  word-break: break-all;
  white-space: pre-wrap;
}
.stlc-error {
  color: #cc0000;
  font-family: monospace;
  font-size: 0.8rem;
  margin-top: 0.5rem;
}
@media (max-width: 480px) {
  .stlc-grid { grid-template-columns: 1fr; }
  .stlc-btn-row { flex-direction: column; align-items: stretch; }
  #stlcCalcBtn { text-align: center; }
}