.bb-wrap {
  margin: 2rem 0;
}

.bb-card {
  border: 1px solid #d7dbe2;
  border-radius: 14px;
  padding: 1.25rem;
  background: #fbfcfe;
  box-shadow: 0 8px 24px rgba(20, 30, 50, 0.06);
}

.bb-card h3 {
  margin: 0 0 0.75rem 0;
  font-size: 1.35rem;
  line-height: 1.3;
}

.bb-intro,
.bb-note {
  margin: 0.75rem 0 0 0;
  color: #2c3440;
  line-height: 1.6;
}

.bb-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin: 1rem 0 1rem 0;
}

.bb-controls label {
  font-weight: 600;
}

.bb-controls input[type="range"] {
  flex: 1 1 280px;
  min-width: 220px;
}

#bbTempValue {
  font-weight: 700;
  min-width: 80px;
}

.bb-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 0.5rem 0 1rem 0;
}

.bb-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: #1f2937;
  font-size: 0.96rem;
}

.bb-line {
  width: 36px;
  height: 0;
  border-top-width: 3px;
  border-top-style: solid;
  display: inline-block;
}

.bb-line-planck {
  border-top-color: #1565c0;
}

.bb-line-rj {
  border-top-color: #c62828;
}

.bb-canvas-wrap {
  width: 100%;
  overflow-x: auto;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 0.5rem;
}

#blackbodyCanvas {
  width: 100%;
  height: auto;
  display: block;
  background: #ffffff;
}

@media (max-width: 700px) {
  .bb-card {
    padding: 1rem;
  }

  .bb-card h3 {
    font-size: 1.2rem;
  }

  .bb-intro,
  .bb-note,
  .bb-legend-item {
    font-size: 0.95rem;
  }
}