:root {
  --FONT: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu; 
  --FONT-COLOR: #1f1f1f;
  --LIGHT-DARK-TOGGLE: #7a5cce;
  --BLUE: #0066b2;
  --FADED-COLOR: rgb(31, 31, 31, 0.7);
  --BACKGROUND-COLOR: #fdfdfd;
  --X-SMALL: 12px;
  --SMALL: 14px;
  --MEDIUM: 18px;
  --LARGE: 24px;
  --THIN: 300;
  --NORMAL: 500;
  --THICK: 600;
}

hr.oximetry {
  border: 0.5px solid var(--FONT-COLOR);
  margin-bottom: 20px;
}

.threshold-mode {
  margin: 20px auto;
  width: 80%;
}

.mode-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 20px;
}

.mode-btn {
  padding: 12px;
  border-radius: 8px;
  border: 2px solid #e1e5e9;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: var(--NORMAL);
}

.mode-btn:hover, .mode-btn.active {
  background: var(--BLUE);
  color: #f1f1f1;
  border-color: var(--BLUE);
}

.slider-container {
  margin: 15px auto;
  width: 80%;
}

.slider-label {
  text-align: center;
  font-weight: var(--NORMAL);
  margin-bottom: 8px;
}

.slider {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: #ddd;
  outline: none;
  -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--BLUE);
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--BLUE);
  cursor: pointer;
  border: none;
}

.threshold-value {
  text-align: center;
  font-weight: var(--NORMAL);
  color: var(--BLUE);
  font-size: var(--MEDIUM);
  margin-top: 8px;
}

.class-wise-controls {
  display: none;
}

.class-wise-controls.active {
  display: block;
}

h4.oximetry {
  margin: 0;
  font-weight: var(--NORMAL);
}

.metrics-section {
  margin-bottom: 30px;
}

.metrics-grid {
  margin-bottom: 20px;
}

.metric-card > span {
  font-size: var(--SMALL);
  font-weight: var(--THIN);
}

.metric-card > span.label {
  font-weight: var(--NORMAL);
  color: var(--BLUE);
  margin: 5px 8px;
}

.summary-stat {
  text-align: center;
  margin-bottom: 20px;
}

.summary-stat > span {
  display: block;
  font-size: var(--LARGE);
  font-weight: var(--NORMAL);
  color: var(--BLUE);
}

.summary-stat > span.label {
  font-size: var(--SMALL);
  font-weight: var(--THIN);
}

.stat {
  font-weight: var(--NORMAL);
  color: var(--BLUE);
}

#histogram-container {
  margin-top: 20px;
  display: grid;
  grid-template-columns: auto auto;
}