:root {
  color-scheme: light;
}

[data-theme="dark"] {
  color-scheme: dark;
}

.course-content {
  max-width: 900px;
  --course-control-border: #737373;
  --course-table-border: #858585;
  --course-soft-accent: rgba(0, 107, 179, 0.1);
  --course-neutral-fill: rgba(115, 115, 115, 0.22);
  --course-accent-fill: rgba(0, 107, 179, 0.32);
  --link-color: #006bb3;
}

[data-theme="dark"] .course-content {
  --course-control-border: #a3a3a3;
  --course-table-border: #777;
  --course-soft-accent: rgba(102, 179, 255, 0.14);
  --course-neutral-fill: rgba(163, 163, 163, 0.24);
  --course-accent-fill: rgba(102, 179, 255, 0.34);
  --link-color: #66b3ff;
}

.skip-link {
  position: fixed;
  top: -80px;
  left: 12px;
  z-index: 1100;
  padding: 9px 13px;
  color: var(--navbar-text);
  background: var(--navbar-bg);
  border: 2px solid var(--navbar-text);
  border-radius: 5px;
  font-weight: 700;
}

.skip-link:focus {
  top: 12px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.course-context {
  margin-bottom: 8px !important;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
}

.course-title {
  margin-bottom: 24px;
  padding-bottom: 12px;
  color: var(--text-secondary);
  border-bottom: 2px solid var(--border-color);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.course-return {
  margin-bottom: 16px !important;
  font-size: 0.95rem;
}

.course-content p a,
.course-content figcaption a {
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.noscript-note {
  margin: 18px 0 !important;
  padding: 10px 0 10px 14px;
  border-left: 4px solid var(--link-color);
}

.course-week-list {
  margin-top: 28px !important;
  padding-left: 0 !important;
  list-style: none;
  border-top: 1px solid var(--border-color);
}

.course-week-list > li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  margin: 0;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-color);
}

.course-week-list em {
  display: inline-block;
  margin-left: 8px;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 400;
}

.course-week-reading,
.course-week-date {
  color: var(--text-primary);
  font-size: 0.9rem;
}

.course-week-reading {
  display: block;
  margin-top: 2px;
}

.course-week-date {
  white-space: nowrap;
}

.lesson-introduction {
  font-size: 1.08rem;
}

.lesson-photo {
  max-width: 560px;
  margin: 26px auto 18px;
}

.lesson-photo img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.lesson-photo figcaption,
.om-figure figcaption,
.figure-note {
  margin-top: 8px;
  color: var(--text-primary);
  font-size: 0.88rem;
  line-height: 1.5;
}

.companion-guide {
  margin: 20px 0;
  padding: 10px 0 10px 14px;
  border-left: 4px solid var(--link-color);
}

.companion-guide p {
  margin: 0 !important;
}

.companion-guide p + p {
  margin-top: 4px !important;
  font-size: 0.94rem;
}

.lesson-jump-links {
  padding: 13px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.lesson-jump-links ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 34px;
  margin: 0;
  padding-left: 24px;
}

.lesson-jump-links li {
  margin: 0;
}

.course-section {
  scroll-margin-top: 110px;
  padding: 34px 0;
  border-bottom: 1px solid var(--border-color);
}

.course-section h2 {
  margin-bottom: 15px;
  padding-bottom: 0;
  color: var(--text-secondary);
  border-bottom: 0;
  font-size: 1.45rem;
  line-height: 1.3;
}

.course-section h2 span {
  margin-right: 5px;
  color: var(--link-color);
  font-size: 0.82em;
}

.course-section h3,
.reveal-panel > h3,
.om-figure > h3 {
  margin: 0 0 14px;
  color: var(--text-secondary);
  font-size: 1.15rem;
  line-height: 1.35;
}

.course-exercise {
  margin: 24px 0;
  padding: 22px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.course-exercise fieldset,
.reasoning-question fieldset {
  min-width: 0;
  border: 0;
}

.course-exercise legend,
.reasoning-question legend {
  margin-bottom: 8px;
  color: var(--text-secondary);
  font-size: 1.08rem;
  font-weight: 700;
}

.exercise-instruction {
  margin-bottom: 14px !important;
  color: var(--text-primary);
  font-size: 0.92rem;
}

.prediction-list,
.calculation-list {
  margin-bottom: 22px;
  border-top: 1px solid var(--border-color);
}

.prediction-item,
.calculation-item {
  display: grid;
  gap: 14px;
  align-items: center;
  padding: 13px 0;
  border-bottom: 1px solid var(--border-color);
}

.prediction-item {
  grid-template-columns: minmax(170px, 0.8fr) minmax(150px, 190px) minmax(220px, 1.2fr);
}

.calculation-item {
  grid-template-columns: minmax(170px, 0.8fr) minmax(130px, 170px) minmax(105px, 0.5fr) minmax(210px, 1.2fr);
}

.prediction-item label,
.calculation-item label {
  font-weight: 500;
}

.prediction-item select,
.calculation-item select,
.calculation-item input {
  width: 100%;
  min-height: 42px;
  padding: 8px 10px;
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--course-control-border);
  border-radius: 5px;
  font: inherit;
}

.calculation-unit {
  color: var(--text-primary);
  font-size: 0.9rem;
}

.item-feedback {
  min-height: 1.5em;
  font-size: 0.9rem;
  font-weight: 600;
}

.exercise-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.course-button,
.scenario-button {
  min-height: 42px;
  padding: 9px 15px;
  color: var(--navbar-text);
  background: var(--navbar-bg);
  border: 1px solid var(--navbar-bg);
  border-radius: 5px;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
}

.course-button-secondary,
.scenario-button {
  color: var(--text-primary);
  background: transparent;
  border-color: var(--course-control-border);
}

.course-button:hover,
.scenario-button:hover {
  filter: brightness(1.12);
}

.scenario-button[aria-pressed="true"] {
  color: var(--navbar-text);
  background: var(--navbar-bg);
  border-color: var(--navbar-bg);
}

.course-button:focus-visible,
.scenario-button:focus-visible,
.prediction-item select:focus-visible,
.calculation-item select:focus-visible,
.calculation-item input:focus-visible,
.reasoning-question input:focus-visible,
.classification-matrix input:focus-visible,
.classification-matrix-wrap:focus-visible,
.performance-matrix-wrap:focus-visible,
.course-textarea:focus-visible,
.calculation-disclosure summary:focus-visible,
.reading-check summary:focus-visible {
  outline: 3px solid var(--link-color);
  outline-offset: 2px;
}

.exercise-feedback {
  min-height: 1.6em;
  margin: 14px 0 0 !important;
  font-weight: 600;
}

.reasoning-question {
  margin-top: 24px;
}

.reasoning-question label {
  display: block;
  margin: 10px 0;
  cursor: pointer;
}

.reasoning-question input {
  margin-right: 8px;
}

.reasoning-question .course-button,
.prediction-question .course-button {
  margin-top: 10px;
}

.course-textarea {
  display: block;
  width: 100%;
  margin-top: 10px;
  padding: 12px;
  resize: vertical;
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--course-control-border);
  border-radius: 5px;
  font: inherit;
  line-height: 1.5;
}

.scroll-hint {
  display: none;
  margin: 0 0 8px !important;
  color: var(--text-primary);
  font-size: 0.86rem;
  font-weight: 600;
}

.classification-matrix-wrap,
.performance-matrix-wrap {
  overflow-x: auto;
}

.classification-matrix,
.performance-matrix {
  width: 100%;
  border-collapse: collapse;
}

.classification-matrix {
  min-width: 610px;
}

.classification-matrix th,
.classification-matrix td,
.performance-matrix th,
.performance-matrix td {
  padding: 10px;
  border: 1px solid var(--course-table-border);
  text-align: center;
  vertical-align: middle;
}

.classification-matrix th:first-child,
.classification-matrix tbody th {
  width: 58%;
  text-align: left;
}

.classification-matrix tbody th {
  position: sticky;
  left: 0;
  z-index: 1;
  background: var(--bg-secondary);
}

.classification-matrix input {
  width: 20px;
  height: 20px;
  margin: 0;
  cursor: pointer;
}

.classification-matrix tr.is-review th {
  border-left: 4px solid var(--link-color);
}

.performance-matrix th:first-child {
  width: 25%;
}

.performance-matrix {
  min-width: 520px;
}

.performance-matrix .is-scenario {
  background: var(--course-soft-accent);
  box-shadow: inset 0 0 0 2px var(--link-color);
}

.performance-matrix .is-scenario strong,
.performance-matrix .is-scenario span {
  display: block;
}

.performance-matrix .is-scenario strong {
  margin-bottom: 4px;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.reveal-panel {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--border-color);
}

.reveal-panel[hidden] {
  display: none;
}

.om-figure {
  margin: 24px 0;
}

.om-flow {
  display: grid;
  gap: 22px;
  margin: 0 !important;
  padding: 0 !important;
  list-style: none;
}

.om-flow-three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.om-flow-six {
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 18px;
}

.om-flow li {
  position: relative;
  min-width: 0;
  margin: 0;
  padding: 13px 11px;
  background: var(--bg-secondary);
  border-top: 3px solid var(--link-color);
  border-bottom: 1px solid var(--course-control-border);
  line-height: 1.35;
}

.om-flow li:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -18px;
  content: "→";
  color: var(--text-secondary);
  font-size: 1.15rem;
  transform: translateY(-50%);
}

.om-flow strong,
.om-flow span {
  display: block;
}

.om-flow strong {
  overflow-wrap: anywhere;
}

.om-flow span:not(.om-flow-label) {
  margin-top: 5px;
  font-size: 0.86rem;
}

.om-flow-label,
.scenario-label {
  margin-bottom: 5px;
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.om-givens {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 22px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.om-givens > div {
  padding: 12px 16px;
}

.om-givens > div + div {
  border-left: 1px solid var(--border-color);
}

.om-givens dt {
  color: var(--text-secondary);
  font-weight: 700;
}

.om-givens dd {
  margin: 2px 0 0;
}

.formula-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 18px 0 22px;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.formula-strip-three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.formula-strip > div {
  padding: 10px 14px;
}

.formula-strip > div + div {
  border-left: 1px solid var(--border-color);
}

.formula-strip dt {
  color: var(--text-secondary);
  font-size: 0.86rem;
  font-weight: 700;
}

.formula-strip dd {
  margin: 2px 0 0;
  font-size: 0.9rem;
}

.metric-comparison {
  margin: 0;
  border-top: 1px solid var(--border-color);
}

.metric-row {
  display: grid;
  grid-template-columns: minmax(140px, 0.7fr) repeat(2, minmax(180px, 1fr));
  gap: 18px;
  align-items: center;
  padding: 15px 0;
  border-bottom: 1px solid var(--border-color);
}

.metric-row dt {
  color: var(--text-secondary);
  font-weight: 700;
}

.metric-row dd {
  min-width: 0;
  margin: 0;
}

.metric-row dd > span,
.metric-row dd > strong {
  display: block;
}

.metric-row dd > span:first-child {
  font-size: 0.82rem;
  font-weight: 600;
}

.metric-row dd > strong {
  min-height: 3em;
  overflow-wrap: anywhere;
}

.metric-track {
  height: 9px;
  margin-top: 7px;
  overflow: hidden;
  background: var(--bg-primary);
  border: 1px solid var(--course-control-border);
  border-radius: 99px;
}

.metric-track > span {
  display: block;
  width: var(--metric-size);
  height: 100%;
  background: var(--link-color);
}

.calculation-disclosure,
.reading-check {
  margin-top: 22px;
  padding-top: 15px;
  border-top: 1px solid var(--border-color);
}

.calculation-disclosure summary,
.reading-check summary {
  color: var(--link-color);
  cursor: pointer;
  font-weight: 700;
}

.equation-list {
  margin: 14px 0 0;
  border-top: 1px solid var(--border-color);
}

.equation-list > div {
  display: grid;
  grid-template-columns: minmax(135px, 0.28fr) minmax(0, 1fr);
  gap: 18px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

.equation-list dt {
  color: var(--text-secondary);
  font-weight: 700;
}

.equation-list dd {
  margin: 0;
}

.paired-equations dd {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.paired-equations dd span {
  display: block;
}

.decision-note {
  margin: 22px 0 0 !important;
  padding: 12px 0 12px 16px;
  border-left: 4px solid var(--link-color);
}

.source-chain {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px;
  margin: 16px 0 0;
}

.source-chain > div {
  position: relative;
  padding-top: 10px;
  border-top: 3px solid var(--link-color);
}

.source-chain > div:not(:last-child)::after {
  position: absolute;
  top: 18px;
  right: -17px;
  content: "→";
  color: var(--text-secondary);
}

.source-chain dt {
  color: var(--text-secondary);
  font-weight: 700;
}

.source-chain dd {
  margin: 4px 0 0;
  font-size: 0.9rem;
}

.rate-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 34px;
  margin: 0 !important;
  padding: 0 !important;
  list-style: none;
}

.rate-strip li {
  position: relative;
  margin: 0;
  padding: 12px 8px;
  text-align: center;
  border-top: 3px solid var(--course-control-border);
  border-bottom: 1px solid var(--border-color);
}

.rate-strip li:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -25px;
  content: "→";
  color: var(--text-secondary);
  font-size: 1.3rem;
  transform: translateY(-50%);
}

.rate-strip span,
.rate-strip strong,
.rate-strip small {
  display: block;
}

.rate-strip span,
.rate-strip small {
  font-size: 0.85rem;
}

.rate-strip .rate-resource {
  background: var(--course-soft-accent);
  border-top-color: var(--link-color);
}

.process-overview {
  margin-bottom: 28px;
}

.capacity-profile {
  margin: 0 !important;
  padding: 0 !important;
  list-style: none;
}

.capacity-profile li {
  display: grid;
  grid-template-columns: minmax(125px, 0.65fr) minmax(120px, 1.35fr) minmax(150px, 0.7fr);
  gap: 14px;
  align-items: center;
  margin: 0;
  padding: 10px 8px;
  border-bottom: 1px solid var(--border-color);
}

.capacity-profile li.is-bottleneck {
  background: var(--course-soft-accent);
  border-left: 4px solid var(--link-color);
}

.capacity-task strong,
.capacity-task small,
.capacity-value strong,
.capacity-value small {
  display: block;
}

.capacity-task small,
.capacity-value small {
  font-size: 0.82rem;
}

.capacity-value {
  text-align: right;
}

.capacity-bar {
  height: 13px;
  overflow: hidden;
  background: var(--bg-primary);
  border: 1px solid var(--course-control-border);
  border-radius: 99px;
}

.capacity-bar > span {
  display: block;
  width: var(--capacity-size);
  min-width: 8px;
  height: 100%;
  background: var(--link-color);
}

.result-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 24px 0;
  border-top: 1px solid var(--course-table-border);
  border-bottom: 1px solid var(--course-table-border);
}

.result-strip > div {
  padding: 12px 14px;
}

.result-strip > div + div {
  border-left: 1px solid var(--course-table-border);
}

.result-strip dt {
  color: var(--text-primary);
  font-size: 0.8rem;
  font-weight: 600;
}

.result-strip dd {
  margin: 2px 0 0;
  color: var(--text-secondary);
  font-weight: 700;
}

.pipeline-chart {
  margin-top: 14px;
}

.pipeline-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  margin-bottom: 8px;
}

.pipeline-track {
  position: relative;
  height: 34px;
  background: var(--bg-secondary);
  border: 1px solid var(--course-control-border);
}

.pipeline-bar {
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: var(--pipeline-start);
  display: flex;
  width: var(--pipeline-width);
  min-width: max-content;
  align-items: center;
  justify-content: center;
  padding: 0 6px;
  color: var(--navbar-text);
  background: var(--navbar-bg);
  font-size: 0.78rem;
  font-weight: 700;
}

.pipeline-axis {
  position: relative;
  height: 1.4em;
  margin-left: 82px;
  color: var(--text-primary);
  font-size: 0.76rem;
}

.pipeline-axis span {
  position: absolute;
  left: var(--tick-position);
  white-space: nowrap;
  transform: translateX(-50%);
}

.pipeline-axis .is-first {
  transform: none;
}

.pipeline-axis .is-last {
  transform: translateX(-100%);
}

.scenario-explorer {
  margin-top: 22px;
}

.scenario-panel + .scenario-panel {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--border-color);
}

.scenario-explorer.is-enhanced .scenario-panel {
  margin-top: 24px;
  padding-top: 0;
  border-top: 0;
}

.scenario-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.scenario-path {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 30px;
  margin-top: 24px;
}

.scenario-path > div {
  position: relative;
  min-height: 100px;
  padding: 13px 10px;
  border-top: 3px solid var(--link-color);
  border-bottom: 1px solid var(--course-control-border);
}

.scenario-path > div:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -22px;
  content: "→";
  color: var(--text-secondary);
  font-size: 1.25rem;
  transform: translateY(-50%);
}

.scenario-path span,
.scenario-path strong {
  display: block;
}

.scenario-results {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.model-boundary p {
  margin: 12px 0 0;
}

.branch-figure {
  margin-top: 32px;
  padding-top: 26px;
  border-top: 1px solid var(--border-color);
}

.om-branch {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.om-branch > div {
  padding: 12px 10px;
  border-top: 3px solid var(--link-color);
  border-bottom: 1px solid var(--course-control-border);
}

.om-branch span,
.om-branch strong {
  display: block;
}

.om-branch > div > span:last-child {
  margin-top: 5px;
  font-size: 0.88rem;
}

.inventory-figure {
  margin-top: 26px;
}

.inventory-profile {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  grid-template-rows: auto auto;
  width: 100%;
  max-width: 680px;
  margin: 30px auto 0;
}

.inventory-y-axis {
  position: relative;
  grid-column: 1;
  grid-row: 1;
  color: var(--text-primary);
  font-size: 0.78rem;
  font-weight: 600;
}

.inventory-y-axis span {
  position: absolute;
  right: 9px;
  white-space: nowrap;
}

.inventory-y-axis span:first-child {
  top: 0;
  transform: translateY(-50%);
}

.inventory-y-axis span:last-child {
  bottom: 0;
  transform: translateY(50%);
}

.inventory-y-axis .inventory-mid-label {
  top: 50%;
  transform: translateY(-50%);
}

.inventory-plot {
  position: relative;
  grid-column: 2;
  grid-row: 1;
  min-height: 120px;
  aspect-ratio: 2 / 1;
  border-bottom: 2px solid var(--course-control-border);
  border-left: 2px solid var(--course-control-border);
}

.inventory-area,
.inventory-bin-area,
.inventory-truck-area {
  position: absolute;
  inset: 0;
  filter:
    drop-shadow(1px 0 0 var(--course-control-border))
    drop-shadow(-1px 0 0 var(--course-control-border))
    drop-shadow(0 1px 0 var(--course-control-border))
    drop-shadow(0 -1px 0 var(--course-control-border));
}

.inventory-area {
  background: var(--course-accent-fill);
  clip-path: polygon(0 100%, 50% 0, 100% 100%);
}

.inventory-bin-area {
  background: var(--course-neutral-fill);
  clip-path: polygon(0 100%, 25% 50%, 75% 50%, 100% 100%);
}

.inventory-truck-area {
  background:
    repeating-linear-gradient(
      135deg,
      transparent 0,
      transparent 7px,
      var(--text-secondary) 7px,
      var(--text-secondary) 9px
    ),
    var(--course-accent-fill);
  clip-path: polygon(25% 50%, 50% 0, 75% 50%);
}

.inventory-peak-guide {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  border-left: 1px dashed var(--course-control-border);
}

.inventory-bin-limit {
  position: absolute;
  top: 50%;
  right: 25%;
  left: 25%;
  border-top: 2px dashed var(--text-secondary);
}

.inventory-peak-label {
  position: absolute;
  top: 8px;
  left: 50%;
  padding: 2px 5px;
  color: var(--text-secondary);
  background: var(--bg-primary);
  font-size: 0.8rem;
  transform: translateX(-50%);
}

.inventory-time-axis {
  display: grid;
  grid-column: 2;
  grid-row: 2;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 7px;
  color: var(--text-primary);
  font-size: 0.76rem;
  font-weight: 600;
}

.inventory-time-axis-five {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.inventory-time-axis span {
  min-width: 0;
  text-align: center;
}

.inventory-time-axis span:first-child {
  text-align: left;
}

.inventory-time-axis span:last-child {
  text-align: right;
}

.inventory-time-axis small {
  display: block;
  font-size: inherit;
  font-weight: 400;
}

.inventory-legend {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  max-width: 680px;
  margin: 20px auto 0;
}

.inventory-legend > div {
  padding: 7px 10px;
  border-left: 5px solid var(--course-control-border);
}

.inventory-legend .inventory-legend-trucks {
  border-left-color: var(--link-color);
}

.inventory-legend dt {
  display: flex;
  gap: 7px;
  align-items: center;
  color: var(--text-secondary);
  font-size: 0.84rem;
  font-weight: 700;
}

.inventory-legend dt::before {
  width: 14px;
  height: 14px;
  flex: 0 0 14px;
  content: "";
  background: var(--course-neutral-fill);
  border: 1px solid var(--course-control-border);
}

.inventory-legend-trucks dt::before {
  background:
    repeating-linear-gradient(
      135deg,
      transparent 0,
      transparent 3px,
      var(--text-secondary) 3px,
      var(--text-secondary) 5px
    ),
    var(--course-accent-fill);
}

.inventory-legend dd {
  margin: 2px 0 0;
  font-size: 0.88rem;
}

.terminal-capacity-comparison {
  margin-top: 24px;
}

.law-balance {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  margin: 25px 0 0;
  padding: 15px 0;
  border-top: 1px solid var(--course-table-border);
  border-bottom: 1px solid var(--course-table-border);
  text-align: center;
}

.law-balance span {
  min-width: 0;
}

.law-balance strong,
.law-balance small {
  display: block;
}

.law-balance strong {
  overflow-wrap: anywhere;
}

.law-balance small {
  margin-top: 3px;
  color: var(--text-primary);
  font-size: 0.78rem;
}

.compact-exit .course-textarea {
  margin-bottom: 10px;
}

.lesson-footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 26px;
}

@media (max-width: 850px) {
  .om-flow-six {
    grid-template-columns: 1fr;
    gap: 27px;
  }

  .om-flow-six li:not(:last-child)::after {
    top: auto;
    right: 50%;
    bottom: -24px;
    content: "↓";
    transform: translateX(50%);
  }
}

@media (max-width: 760px) {
  .classification-matrix-wrap {
    overflow-x: hidden;
  }

  .classification-matrix {
    width: calc(100% - 1px);
    min-width: 0;
    table-layout: fixed;
    font-size: 0.78rem;
  }

  .classification-matrix th,
  .classification-matrix td {
    padding: 7px 2px;
  }

  .classification-matrix th:first-child,
  .classification-matrix tbody th {
    position: static;
    width: 46%;
  }

  .classification-matrix thead th:not(:first-child) {
    width: 18%;
    font-size: 0.74rem;
  }

  .calculation-item,
  .prediction-item {
    grid-template-columns: 1fr;
    gap: 7px;
  }

  .calculation-unit[aria-hidden="true"],
  .item-feedback:empty {
    display: none;
  }

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

  .metric-row dt {
    grid-column: 1 / -1;
  }

  .scenario-path {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .scenario-path > div {
    min-height: 0;
  }

  .scenario-path > div:not(:last-child)::after {
    top: auto;
    right: 50%;
    bottom: -25px;
    content: "↓";
    transform: translateX(50%);
  }

  .scenario-results {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .scenario-results > div:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--course-table-border);
  }

  .scenario-results > div:nth-child(4) {
    border-top: 1px solid var(--course-table-border);
  }

  .source-chain {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .source-chain > div::after {
    display: none;
  }

}

@media (max-width: 700px) {
  .course-week-list > li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .course-week-date {
    white-space: normal;
  }

  .course-exercise {
    padding: 18px;
  }

  .om-flow-three {
    grid-template-columns: 1fr;
    gap: 27px;
  }

  .om-flow-three li:not(:last-child)::after {
    top: auto;
    right: 50%;
    bottom: -24px;
    content: "↓";
    transform: translateX(50%);
  }

  .om-givens,
  .formula-strip,
  .result-strip {
    grid-template-columns: 1fr;
  }

  .om-givens > div + div,
  .formula-strip > div + div,
  .result-strip > div + div {
    border-top: 1px solid var(--border-color);
    border-left: 0;
  }

  .equation-list > div,
  .paired-equations dd {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .capacity-profile li {
    grid-template-columns: minmax(110px, 0.7fr) minmax(105px, 1fr);
  }

  .capacity-bar {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .capacity-value {
    text-align: right;
  }

  .rate-strip {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .rate-strip li:not(:last-child)::after {
    top: auto;
    right: 50%;
    bottom: -25px;
    content: "↓";
    transform: translateX(50%);
  }

  .om-branch {
    grid-template-columns: 1fr;
  }

}

@media (max-width: 640px) {
  .lesson-jump-links ol {
    display: block;
  }

  .lesson-jump-links li + li {
    margin-top: 5px;
  }

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

  .metric-row dt {
    grid-column: auto;
  }

  .metric-row dd > strong {
    min-height: 0;
  }

  .source-chain {
    grid-template-columns: 1fr;
  }

  .pipeline-row {
    grid-template-columns: 62px minmax(0, 1fr);
  }

  .pipeline-axis {
    margin-left: 72px;
  }

  .pipeline-axis span:nth-child(even):not(:last-child) {
    display: none;
  }
}

@media (max-width: 360px) {
  .pipeline-axis span:nth-child(5) {
    display: none;
  }
}

@media (max-width: 600px) {
  .course-section {
    scroll-margin-top: 190px;
  }

  .scenario-controls {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .scenario-button {
    width: 100%;
  }

  .performance-matrix-wrap {
    overflow-x: hidden;
  }

  .performance-matrix {
    width: calc(100% - 1px);
    min-width: 0;
    table-layout: fixed;
    font-size: 0.78rem;
  }

  .performance-matrix th,
  .performance-matrix td {
    padding: 7px 4px;
    overflow-wrap: anywhere;
  }

  .performance-matrix th:first-child {
    width: 28%;
  }
}

@media (max-width: 540px) {
  .scenario-results {
    grid-template-columns: 1fr;
  }

  .scenario-results > div + div {
    border-top: 1px solid var(--course-table-border);
    border-left: 0;
  }

  .inventory-profile {
    grid-template-columns: 54px minmax(0, 1fr);
  }

  .inventory-plot {
    min-width: 0;
    min-height: 0;
    aspect-ratio: 1.8 / 1;
  }

  .inventory-y-axis,
  .inventory-time-axis {
    font-size: 0.7rem;
  }

  .inventory-peak-label {
    top: 5px;
    max-width: 90px;
    font-size: 0.7rem;
    line-height: 1.2;
    text-align: center;
  }

  .inventory-legend {
    grid-template-columns: 1fr;
  }

  .law-balance {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .navbar-links a:hover,
  .navbar-links a.current-page:hover,
  .theme-toggle:hover,
  .content-section > div:hover,
  a:hover {
    transform: none !important;
  }
}