.reveal .slides section {
  text-align: left;
}

.reveal .slides section h1,
.reveal .slides section h2,
.reveal .slides section h3 {
  text-align: center;
}

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
}

.reveal input,
.reveal button,
.reveal select,
.reveal textarea,
.reveal label,
.reveal summary {
  touch-action: manipulation;
}

.reveal input[type="range"] {
  touch-action: pan-x;
}

.reveal {
  font-size: 24px;
  color: #3f3f3f;
}

.reveal,
.reveal .slides,
.reveal .slide-background,
.reveal .slide-background-content {
  background: rgb(247, 247, 247);
}

.reveal h1 {
  font-size: 1.8em;
}

.reveal h2 {
  font-size: 1.4em;
}

.reveal h3 {
  font-size: 1.15em;
}

.back-link-row {
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  width: 100%;
  margin-top: 12px;
}

.back-link {
  display: inline-block;
  margin: 6px auto 0;
  font-size: 0.95em;
  letter-spacing: 0.03em;
  color: #1f1f1f;
  text-decoration: none;
}

.instruction-link-row {
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  width: 100%;
  margin-top: 12px;
}

.instruction-link {
  display: inline-block;
  margin: 6px auto 0;
  font-size: 0.95em;
  letter-spacing: 0.03em;
  animation: instruction-pulse 1.6s ease-in-out infinite;
}

.instruction-link a {
  color: #1f1f1f;
  text-decoration: none;
}

@keyframes instruction-pulse {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(4px);
  }
  60% {
    transform: translateY(2px);
  }
}

.class-toggle-row {
  display: flex;
  justify-content: center;
  margin: 8px 0 16px;
}

.class-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border-radius: 999px;
  background: #d6dde2;
}

.class-toggle-input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.class-toggle-label {
  padding: 6px 18px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95em;
  letter-spacing: 0.02em;
  color: #3f3f3f;
  cursor: pointer;
}

.class-toggle-input:checked + .class-toggle-label {
  background: #2e6f8e;
  color: #ffffff;
}

.class-interval-plot {
  width: min(720px, 90%);
  margin: 0 auto;
}

.class-interval-plot .frequency-chart {
  padding: 3px;
}

.class-interval-slider {
  width: 100%;
}

.range-dual-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 10px auto 0;
  width: 100%;
  flex-direction: column;
}

.range-dual-values {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  width: 100%;
  gap: 10px 18px;
}

.range-dual-value {
  display: flex;
  align-items: center;
  gap: 6px;
  font-variant-numeric: tabular-nums;
}

.range-dual-track {
  width: 100%;
  padding-left: 50px;
  padding-right: 0px;
  box-sizing: border-box;
}

.range-dual {
  position: relative;
  width: 100%;
  height: 26px;
}

.range-dual input[type="range"] {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  margin: 0;
  pointer-events: none;
  -webkit-appearance: none;
  appearance: none;
  height: 1px;
  border-radius: 8px;
  background: #222222;
  outline: none;
  opacity: 1;
  transition: opacity 1;
}

.range-dual input[type="range"]::-webkit-slider-thumb {
  pointer-events: auto;
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #2e6f8e;
  cursor: pointer;
}

.range-dual input[type="range"]::-moz-range-thumb {
  pointer-events: auto;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #2e6f8e;
  cursor: pointer;
}

.range-dual.is-static input[type="range"]::-webkit-slider-thumb,
.range-dual.is-static input[type="range"]::-moz-range-thumb {
  pointer-events: none;
}

.range-quad-labels {
  position: relative;
  width: 100%;
  height: 16px;
  margin-top: -12px;
  font-variant-numeric: tabular-nums;
  font-size: 0.7em;
}

.range-quad-label {
  position: absolute;
  top: 0;
  transform: translateX(-50%);
  white-space: nowrap;
}

.range-quad-label.edge-left {
  left: 0;
  transform: translateX(0);
}

.range-quad-label.edge-right {
  right: 0;
  left: auto;
  transform: translateX(0);
}

.dataset-grid {
  margin: 18px auto 0;
  max-width: 900px;
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  --dataset-col-gap: 14px;
  row-gap: 8px;
  column-gap: var(--dataset-col-gap);
  text-align: center;
  line-height: 1.4;
  font-size: 0.95em;
  font-variant-numeric: tabular-nums;
  justify-items: center;
}

.mode-instruction {
  text-align: center;
  margin: 10px auto 14px;
  font-size: 0.95em;
}

.mode-grid {
  font-size: 20px;
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 8px 12px;
  width: min(720px, 92%);
  margin: 10px auto 16px;
  justify-items: center;
}

.mode-item {
  width: 100%;
  max-width: 52px;
  padding: 6px 0;
  border: 1px solid #b7c2c9;
  border-radius: 8px;
  background: #ffffff;
  font: inherit;
  font-variant-numeric: tabular-nums;
  color: #3f3f3f;
  cursor: pointer;
}

.mode-item:hover {
  background: #f1f4f6;
}

.mode-item.is-excluded {
  background: #e7ebee;
  border-color: #d0d7dc;
  color: #9aa9b3;
  cursor: pointer;
}

.mode-summary {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 0px;
  font-weight: 600;
  text-align: center;
}

.mode-summary-sep {
  opacity: 0.6;
}

.mean-plot {
  --mean-chart-shift: -20px;
  width: min(720px, 90%);
  margin: 0 auto;
}

.mean-plot .frequency-chart {
  padding: 0;
  margin-top: var(--mean-chart-shift);
  background: transparent;
  transition: transform 0.25s ease;
}

.mean-plot .frequency-chart .plot-container,
.mean-plot .frequency-chart .svg-container,
.mean-plot .frequency-chart svg {
  background: transparent !important;
}

.mean-slider {
  width: 100%;
  margin-top: 50px;
}

.mean-slider .range-dual-track {
  padding-left: 22px;
  padding-right: 22px;
}

.variance-line-plot {
  width: min(720px, 90%);
  margin: 22px auto 0;
}

.variance-formula {
  width: min(780px, 95%);
  margin: 10px auto 0;
  text-align: center;
}

.variance-line-chart {
  padding: 4px;
}

.quartile-line-plot {
  margin-top: 0;
}

.quartile-formula {
  width: min(780px, 95%);
  margin: 8px auto 0;
  text-align: center;
}

.regression-scatter-plot {
  width: min(720px, 90%);
  margin: 16px auto 0;
}

.regression-scatter-chart {
  padding: 4px;
}

.regression-fit-formula {
  width: min(780px, 95%);
  margin: 6px auto 0;
  text-align: center;
}

.regression-fit-plot {
  width: min(720px, 90%);
  margin: 10px auto 0;
}

.regression-fit-chart {
  padding: 4px;
}

.regression-fit-controls {
  width: min(720px, 90%);
  margin: 10px auto 0;
  display: grid;
  gap: 10px;
}

.regression-fit-control {
  display: flex;
  align-items: center;
  gap: 12px;
}

.regression-fit-label {
  width: 20px;
  text-align: center;
  font-weight: 600;
}

.regression-fit-control input[type="range"] {
  flex: 1;
  accent-color: #2e6f8e;
}

.regression-fit-value {
  width: 56px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-size: 0.85em;
}

.rho-correlation-plot {
  width: min(720px, 90%);
  margin: 12px auto 0;
}

.rho-correlation-chart {
  padding: 4px;
}

.rho-correlation-controls {
  width: min(720px, 90%);
  margin: 10px auto 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.rho-correlation-label {
  width: 24px;
  text-align: center;
  font-weight: 600;
}

.rho-correlation-controls input[type="range"] {
  flex: 1;
  accent-color: #2e6f8e;
}

.rho-correlation-value {
  width: 56px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-size: 0.85em;
}

.regression-controls {
  width: min(860px, 92%);
  margin: 12px auto 0;
  position: relative;
}

.regression-choice-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.regression-choice-btn {
  border: 1px solid #b7c2c9;
  border-radius: 8px;
  background: #ffffff;
  color: #3f3f3f;
  font: inherit;
  font-size: 0.86em;
  line-height: 1.25;
  padding: 10px 10px;
  cursor: pointer;
}

.regression-choice-btn:hover {
  background: #f1f4f6;
}

.regression-choice-btn.is-selected {
  background: #2e6f8e;
  border-color: #2e6f8e;
  color: #ffffff;
}

.regression-choice-btn.is-correct {
  background: #2c8b5f;
  border-color: #2c8b5f;
  color: #ffffff;
}

.regression-choice-btn.is-incorrect {
  background: #c24b4b;
  border-color: #c24b4b;
  color: #ffffff;
}

.regression-verify-row {
  display: flex;
  justify-content: center;
  margin-top: 12px;
}

.regression-verify-btn {
  border: none;
  border-radius: 12px;
  box-shadow: 0 4px 0 #1b4c61;
  background: #2e6f8e;
  color: #ffffff;
  font: inherit;
  font-size: 0.9em;
  padding: 7px 22px;
  cursor: pointer;
}

.regression-verify-btn:hover {
  background: #3a7f9f;
}

.regression-verify-btn:active {
  transform: translateY(4px);
  box-shadow: 0 0 0 #1b4c61;
}

.regression-fireworks {
  position: absolute;
  top: -130px;
  left: 50%;
  transform: translateX(-50%);
  width: min(680px, 95%);
  height: 140px;
  margin: 0;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 2;
}

.regression-fireworks.active {
  opacity: 1;
}

.regression-firework {
  position: absolute;
  width: 0;
  height: 0;
}

.regression-firework .regression-spark {
  position: absolute;
  width: 4px;
  height: 16px;
  background: var(--color);
  border-radius: 2px;
  transform-origin: 50% 100%;
  animation: regression-spark 1.1s ease-out forwards;
  animation-delay: var(--delay);
}

@keyframes regression-spark {
  0% {
    transform: rotate(var(--angle)) translateY(0);
    opacity: 1;
  }
  100% {
    transform: rotate(var(--angle)) translateY(-60px);
    opacity: 0;
  }
}

.variance-control {
  width: min(720px, 90%);
  margin: 8px auto 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.variance-control-label {
  font-weight: 600;
  font-size: 0.9em;
  white-space: nowrap;
}

.variance-control--dispersion input[type="range"] {
  flex: 1;
  accent-color: #2e6f8e;
}

.variance-mean-slider {
  flex: 1;
  min-width: 0;
}

.variance-mean-slider .range-dual-track {
  padding-left: 24px;
  padding-right: 24px;
}

.variance-mean-range {
  position: relative;
  height: 24px;
}

.variance-mean-range input[type="range"] {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  margin: 0;
  pointer-events: auto;
  -webkit-appearance: none;
  appearance: none;
  height: 2px;
  border-radius: 999px;
  background: #c4ccd2;
  outline: none;
}

.variance-mean-range input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  border-radius: 999px;
  background: #c4ccd2;
}

.variance-mean-range input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}

.variance-mean-range input[type="range"]::-moz-range-track {
  height: 2px;
  border: 0;
  border-radius: 999px;
  background: #c4ccd2;
}

.variance-mean-range input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}

.variance-mean-indicator {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1px solid #7f3131;
  background: #b84b4b;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.mean-slider-value {
  font-weight: 600;
}

.dataset-boundary {
  position: relative;
}

.dataset-grid.show-boundaries .dataset-boundary::after {
  content: "";
  position: absolute;
  right: calc(var(--dataset-col-gap) / -2);
  top: 10%;
  width: 2px;
  height: 80%;
  background: #b7c2c9;
}

.is-hidden {
  display: none;
}

.frequency-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 0.9em;
}

.frequency-table th,
.frequency-table td {
  border-bottom: 1px solid #d6dde2;
  border-right: 1px solid #d6dde2;
  padding: 8px 10px;
  text-align: left;
}

.frequency-table th:last-child,
.frequency-table td:last-child {
  border-right: none;
}

.frequency-input {
  width: 110px;
  padding: 4px 6px;
  border-radius: 6px;
  border: 1px solid #b7c2c9;
  font: inherit;
  text-align: left;
}

.frequency-layout {
  display: grid;
  gap: 16px;
  max-width: 100%;
}

.frequency-panel {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(260px, 1fr);
  grid-template-rows: auto 260px auto;
  grid-template-areas:
    "table diagram-title"
    "table diagram"
    "table toggle";
  gap: 16px;
  align-items: start;
  min-width: 0;
}

.frequency-panel .frequency-table {
  grid-area: table;
}

.frequency-diagram-title {
  grid-area: diagram-title;
  font-weight: 600;
  text-align: center;
  margin-top: 12px;
}

.frequency-chart {
  grid-area: diagram;
  min-height: 260px;
  height: 260px;
  border-radius: 10px;
  background: rgb(247, 247, 247);
  padding: 6px;
  max-width: 100%;
  overflow: hidden;
}

.frequency-chart .plot-container,
.frequency-chart .svg-container,
.frequency-chart svg {
  width: 100% !important;
  height: 100% !important;
}

.frequency-toggle {
  grid-area: toggle;
  display: flex;
  justify-content: center;
  margin-top: 8px;
}

.frequency-switch {
  --track-width: 190px;
  --track-height: 6px;
  --thumb-size: 30px;
  --thumb-offset: calc(var(--track-width) - var(--thumb-size));
  position: relative;
  display: inline-flex;
  align-items: center;
  width: var(--track-width);
  height: var(--thumb-size);
}

.frequency-switch-input {
  opacity: 0;
  width: 0;
  height: 0;
}

.frequency-switch-track {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(50% - (var(--track-height) / 2));
  height: var(--track-height);
  background: #d6dde2;
  border-radius: 999px;
}

.frequency-switch-thumb {
  position: absolute;
  width: var(--thumb-size);
  height: var(--thumb-size);
  left: 0;
  top: calc(50% - (var(--thumb-size) / 2));
  border-radius: 50%;
  background: #2e6f8e;
  transition: transform 0.2s ease;
}

.frequency-switch-input[value="relative"]:checked ~ .frequency-switch-thumb {
  transform: translateX(calc(var(--thumb-offset) / 3));
}

.frequency-switch-input[value="pareto"]:checked ~ .frequency-switch-thumb {
  transform: translateX(calc(var(--thumb-offset) * 2 / 3));
}

.frequency-switch-input[value="pie"]:checked ~ .frequency-switch-thumb {
  transform: translateX(var(--thumb-offset));
}

.frequency-switch-marker {
  position: absolute;
  top: 50%;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #b7c2c9;
  transform: translate(-50%, -50%);
  cursor: pointer;
}

.marker-absolute {
  left: calc(var(--thumb-size) / 2);
}

.marker-relative {
  left: calc((var(--thumb-size) / 2) + (var(--thumb-offset) / 3));
}

.marker-pareto {
  left: calc((var(--thumb-size) / 2) + (var(--thumb-offset) * 2 / 3));
}

.marker-pie {
  left: calc(100% - (var(--thumb-size) / 2));
}

.frequency-switch-input[value="absolute"]:checked ~ .marker-absolute,
.frequency-switch-input[value="relative"]:checked ~ .marker-relative,
.frequency-switch-input[value="pareto"]:checked ~ .marker-pareto,
.frequency-switch-input[value="pie"]:checked ~ .marker-pie {
  background: #2e6f8e;
}

.frequency-data-block {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  min-width: 0;
}

.frequency-data-label {
  font-weight: 600;
  margin-bottom: 0;
  flex: 0 0 auto;
}

.frequency-data-list {
  display: flex;
  gap: 8px;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  padding: 6px 8px;
  border: 1px solid #d6dde2;
  border-radius: 8px;
  background: #ffffff;
  overflow-x: auto;
  white-space: nowrap;
}

.frequency-data-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.85em;
}

@media (max-width: 720px) {
  .frequency-panel {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 260px auto;
    grid-template-areas:
      "table"
      "diagram-title"
      "diagram"
      "toggle";
  }

  .dataset-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    --dataset-col-gap: 10px;
    row-gap: 6px;
    column-gap: var(--dataset-col-gap);
  }

  .mode-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 6px 10px;
  }

  .regression-choice-row {
    grid-template-columns: 1fr;
  }
}