body.page-linear-algebra .eyebrow {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.86rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.la-concept-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.la-concept-grid article {
  padding: 15px 17px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.la-concept-grid h4 {
  margin: 0 0 6px;
}

.la-concept-grid p {
  margin: 0;
}

.la-lab {
  overflow: hidden;
  margin: 18px 0 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.la-lab-toolbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 22px;
  padding: 15px 18px;
  border-bottom: 1px solid var(--line);
}

.la-dimensions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.la-dimensions label,
.la-control-label {
  display: grid;
  gap: 4px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.la-dimensions select,
.la-lab input,
.la-lab button {
  min-height: 39px;
  box-sizing: border-box;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}

.la-dimensions select {
  min-width: 88px;
  padding: 6px 28px 6px 9px;
}

.la-lab button {
  padding: 7px 11px;
  background: var(--panel-alt);
  cursor: pointer;
  font-size: 0.87rem;
  font-weight: 650;
}

.la-lab button:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.la-lab button:disabled {
  cursor: not-allowed;
  opacity: 0.38;
}

.la-lab button:focus-visible,
.la-lab input:focus-visible,
.la-lab select:focus-visible,
.lt-vector-handle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.la-toolbar-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.la-matrix {
  --matrix-columns: 2;
  position: relative;
  display: grid;
  grid-template-columns: repeat(var(--matrix-columns), minmax(46px, auto));
  gap: 5px;
  padding: 7px 12px;
}

.la-matrix::before,
.la-matrix::after {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 7px;
  border-top: 2px solid var(--text);
  border-bottom: 2px solid var(--text);
  content: "";
}

.la-matrix::before {
  left: 0;
  border-left: 2px solid var(--text);
}

.la-matrix::after {
  right: 0;
  border-right: 2px solid var(--text);
}

.la-matrix-cell {
  display: flex;
  min-width: 46px;
  min-height: 39px;
  box-sizing: border-box;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 5px;
  font-size: 0.94rem;
  font-variant-numeric: tabular-nums;
  transition: background 140ms ease, border-color 140ms ease, color 140ms ease;
}

.la-matrix-cell input {
  width: 46px;
  min-height: 37px;
  padding: 4px 3px;
  border-color: color-mix(in srgb, var(--line) 75%, transparent);
  border-radius: 5px;
  text-align: center;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
  appearance: textfield;
}

.la-matrix-cell input::-webkit-inner-spin-button,
.la-matrix-cell input::-webkit-outer-spin-button {
  margin: 0;
  appearance: none;
}

.mm-stage-scroll {
  overflow-x: auto;
  background-color: var(--panel-alt);
  background-image: radial-gradient(circle, color-mix(in srgb, var(--line) 75%, transparent) 1px, transparent 1px);
  background-size: 18px 18px;
  scrollbar-width: thin;
}

.mm-stage {
  display: flex;
  min-width: 760px;
  min-height: 275px;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 28px 20px;
}

.mm-stage figure {
  margin: 0;
}

.mm-stage figcaption {
  margin-bottom: 10px;
  color: var(--accent);
  font-size: 1.15rem;
  font-weight: 700;
  text-align: center;
}

.mm-stage figcaption small {
  margin-left: 4px;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 400;
}

.mm-operator {
  color: var(--muted);
  font-size: 1.6rem;
}

.la-result-matrix .la-matrix-cell {
  border-color: color-mix(in srgb, var(--line) 80%, transparent);
  background: var(--panel);
  color: var(--muted);
}

.la-matrix-cell.is-row,
.la-legend .row {
  border-color: #b56e15;
  background: color-mix(in srgb, #d89024 16%, var(--panel));
}

.la-matrix-cell.is-column,
.la-legend .column {
  border-color: #6b52a3;
  background: color-mix(in srgb, #6b52a3 15%, var(--panel));
}

.la-matrix-cell.is-factor,
.la-legend .factor {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 22%, var(--panel));
  color: var(--text);
  font-weight: 750;
}

.la-matrix-cell.is-result,
.la-legend .result {
  border-color: #25824c;
  background: color-mix(in srgb, #25824c 18%, var(--panel));
  color: var(--text);
  font-weight: 750;
}

.la-matrix-cell.is-complete {
  box-shadow: inset 0 0 0 1px #25824c;
}

.la-live-status {
  display: flex;
  min-height: 82px;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 18px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.la-live-status div > span,
.mm-calculation > span {
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.la-live-status p {
  max-width: 720px;
  margin: 3px 0 0;
  font-weight: 650;
}

.la-live-status > span {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
}

.la-transport {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 11px 18px;
  border-bottom: 1px solid var(--line);
}

.la-transport > div {
  display: flex;
  gap: 5px;
}

.la-transport .primary {
  min-width: 105px;
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.la-transport .primary:hover:not(:disabled) {
  background: color-mix(in srgb, var(--accent) 88%, #000);
  color: #fff;
}

.la-transport label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  font-weight: 650;
}

.la-transport input[type="range"] {
  min-height: auto;
}

.la-transport output {
  min-width: 33px;
  color: var(--muted);
  font-size: 0.79rem;
}

.mm-calculation {
  min-height: 76px;
  box-sizing: border-box;
  padding: 13px 18px 15px;
}

.mm-calculation strong {
  display: block;
  overflow-wrap: anywhere;
  margin-top: 6px;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.la-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 18px;
  padding: 9px 18px 13px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

.la-legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.la-legend i {
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border: 1px solid var(--line);
  border-radius: 3px;
}

.lt-controls {
  display: grid;
  grid-template-columns: auto minmax(210px, 1fr) minmax(250px, 1.2fr);
  align-items: end;
  gap: 24px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
}

.lt-matrix-input {
  grid-template-columns: repeat(2, 62px);
  width: max-content;
  margin-top: 7px;
}

.lt-matrix-input input {
  width: 62px;
  padding: 5px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.lt-vector-controls {
  display: grid;
  gap: 6px;
}

.lt-vector-controls label {
  display: grid;
  grid-template-columns: 14px minmax(120px, 1fr) 38px;
  align-items: center;
  gap: 7px;
  font-size: 0.82rem;
}

.lt-vector-controls input {
  min-height: auto;
}

.lt-vector-controls output {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.lt-presets {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.lt-presets .la-control-label {
  width: 100%;
  text-align: right;
}

.lt-plane-wrap {
  padding: 12px;
  background: var(--panel-alt);
}

.lt-plane-wrap svg {
  display: block;
  width: 100%;
  max-height: 590px;
  margin: 0 auto;
  border: 1px solid color-mix(in srgb, var(--line) 80%, transparent);
  border-radius: 8px;
  background: var(--panel);
  touch-action: none;
}

.lt-grid-line {
  stroke: color-mix(in srgb, var(--line) 75%, transparent);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.lt-transformed-grid-line {
  stroke: color-mix(in srgb, #6b52a3 34%, transparent);
  stroke-width: 1.15;
  vector-effect: non-scaling-stroke;
}

.lt-axis {
  stroke: color-mix(in srgb, var(--text) 50%, var(--line));
  stroke-width: 1.6;
  vector-effect: non-scaling-stroke;
}

.lt-unit-square {
  fill: color-mix(in srgb, var(--accent) 7%, transparent);
  stroke: color-mix(in srgb, var(--accent) 46%, var(--line));
  stroke-dasharray: 5 4;
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
}

.lt-transformed-square {
  fill: color-mix(in srgb, #6b52a3 24%, transparent);
  stroke: #6b52a3;
  stroke-width: 2.4;
  vector-effect: non-scaling-stroke;
}

.lt-basis,
.lt-original-vector,
.lt-image-vector {
  stroke-width: 3;
  vector-effect: non-scaling-stroke;
}

.lt-basis-e1 { stroke: #b6523a; }
.lt-basis-e2 { stroke: #b07a18; }
.lt-original-vector { stroke: var(--accent); }
.lt-image-vector { stroke: #6b52a3; }

.lt-vector-handle {
  fill: var(--accent);
  stroke: var(--panel);
  stroke-width: 3;
  cursor: grab;
  vector-effect: non-scaling-stroke;
}

.lt-vector-handle:active { cursor: grabbing; }

.lt-vector-label {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 14px;
  font-style: italic;
  font-weight: 700;
}

.lt-label-e1 { fill: #b6523a; }
.lt-label-e2 { fill: #9a6811; }
.lt-label-v { fill: var(--accent); }
.lt-label-av { fill: #6b52a3; }

.lt-metrics,
.gauss-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  border-top: 1px solid var(--line);
}

.lt-metrics div,
.gauss-metrics div {
  min-width: 0;
  padding: 11px 12px;
  border-right: 1px solid var(--line);
  text-align: center;
}

.lt-metrics div:last-child,
.gauss-metrics div:last-child { border-right: 0; }

.lt-metrics dt,
.gauss-metrics dt {
  color: var(--muted);
  font-size: 0.7rem;
}

.lt-metrics dd,
.gauss-metrics dd {
  overflow-wrap: anywhere;
  margin: 3px 0 0;
  font-size: 0.91rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.lt-hint {
  margin: 0;
  padding: 9px 14px 12px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
  text-align: center;
}

.gauss-editor {
  margin-top: 7px;
}

.gauss-editor .la-matrix-cell.is-augmented,
.gauss-state .la-matrix-cell.is-augmented {
  margin-left: 7px;
  border-left: 2px solid color-mix(in srgb, var(--text) 55%, var(--line));
}

.gauss-presets {
  align-self: center;
}

.gauss-workspace {
  display: grid;
  grid-template-columns: minmax(360px, 1fr) minmax(250px, 0.7fr);
  min-height: 235px;
  align-items: center;
  gap: 24px;
  padding: 25px 22px;
  background-color: var(--panel-alt);
  background-image: radial-gradient(circle, color-mix(in srgb, var(--line) 75%, transparent) 1px, transparent 1px);
  background-size: 18px 18px;
}

.gauss-workspace figure {
  margin: 0 auto;
}

.gauss-workspace figcaption {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.045em;
  text-align: center;
  text-transform: uppercase;
}

.gauss-state .la-matrix-cell {
  min-width: 58px;
  background: color-mix(in srgb, var(--panel) 92%, transparent);
}

.gauss-state .la-matrix-cell.is-row-operation {
  border-color: #b56e15;
  background: color-mix(in srgb, #d89024 14%, var(--panel));
}

.gauss-state .la-matrix-cell.is-pivot {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 22%, var(--panel));
  color: var(--text);
  font-weight: 750;
}

.gauss-equations {
  padding: 12px 17px;
  border-left: 1px solid var(--line);
}

.gauss-equations p {
  margin: 7px 0;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.gauss-transport {
  justify-content: flex-start;
}

@media (max-width: 960px) {
  .lt-controls {
    grid-template-columns: auto minmax(210px, 1fr);
  }

  .lt-presets {
    grid-column: 1 / -1;
    justify-content: flex-start;
  }

  .lt-presets .la-control-label {
    text-align: left;
  }

  .gauss-workspace {
    grid-template-columns: 1fr;
  }

  .gauss-equations {
    border-top: 1px solid var(--line);
    border-left: 0;
    text-align: center;
  }
}

@media (max-width: 680px) {
  .la-concept-grid {
    grid-template-columns: 1fr;
  }

  .la-lab-toolbar,
  .la-live-status,
  .la-transport {
    align-items: stretch;
    flex-direction: column;
    padding-right: 13px;
    padding-left: 13px;
  }

  .la-toolbar-buttons {
    justify-content: flex-start;
  }

  .la-dimensions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }

  .la-dimensions label:nth-child(2) {
    grid-column: 1 / -1;
  }

  .la-transport > div {
    display: grid;
    grid-template-columns: 40px 40px minmax(100px, 1fr) 40px 40px;
  }

  .la-transport button {
    padding-right: 5px;
    padding-left: 5px;
  }

  .lt-controls {
    grid-template-columns: 1fr;
  }

  .lt-presets {
    grid-column: auto;
  }

  .lt-plane-wrap {
    padding: 7px;
  }

  .lt-metrics,
  .gauss-metrics {
    grid-template-columns: repeat(2, 1fr);
  }

  .lt-metrics div:nth-child(2),
  .gauss-metrics div:nth-child(2) {
    border-right: 0;
  }

  .lt-metrics div:nth-child(-n + 2),
  .gauss-metrics div:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .gauss-workspace {
    overflow-x: auto;
    min-width: 0;
    padding: 20px 12px;
  }

  .gauss-workspace figure {
    min-width: 340px;
  }

  .gauss-transport > div {
    grid-template-columns: 40px 40px minmax(125px, 1fr) minmax(145px, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .la-matrix-cell { transition: none; }
}