.mdt-root {
  min-height: 0;
  overflow: hidden;
}

.mdt-tool {
  height: 100%;
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
}

.mdt-toolbar {
  justify-content: flex-start;
  overflow-x: auto;
  flex-wrap: nowrap;
}

.mdt-workspace {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(270px, 330px);
  gap: 10px;
  padding: 10px;
  overflow: hidden;
}

.mdt-model-panel,
.mdt-teaching-panel,
.mdt-builder-panel {
  min-height: 0;
  border: 1px solid var(--mdr-line);
  border-radius: var(--mdr-radius);
  background: #ffffff;
  box-shadow: var(--mdr-shadow);
}

.mdt-model-panel {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  overflow: hidden;
}

.mdt-model-scroll {
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  place-items: stretch center;
  gap: 10px;
  padding: 14px;
  overflow: auto;
  overscroll-behavior: contain;
  background:
    linear-gradient(#eaf2f7 1px, transparent 1px),
    linear-gradient(90deg, #eaf2f7 1px, transparent 1px),
    #ffffff;
  background-size: 34px 34px;
}

.mdt-canvas-equation {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 4px 14px;
  color: #083a55;
  text-align: center;
  font-size: clamp(2.4rem, 5vw, 4.5rem);
  font-weight: 900;
  line-height: 1;
}

.mdt-canvas-equation strong {
  color: inherit;
}

.mdt-model-scale {
  --mdt-view-zoom: 1;
  width: min(100%, 940px);
  transform: scale(var(--mdt-view-zoom));
  transform-origin: center;
  transition: transform 160ms ease;
}

.mdt-bar-tool .mdt-model-scale {
  width: min(100%, 1120px);
}

.mdt-model-host {
  width: 100%;
  min-height: 320px;
  display: grid;
  place-items: center;
}

.mdt-bar-tool .mdt-model-host {
  min-height: 350px;
}

.mdt-bar-tool .mdt-model-host > figure,
.mdt-bar-tool .mdt-model-host .question-visual {
  width: 100%;
  max-width: none;
}

.mdt-bar-tool .bar-model-figure > figcaption,
.mdt-rods-tool .question-visual > figcaption,
.mdt-equalGroups-tool .question-visual > figcaption,
.mdt-numberShapes-tool .question-visual > figcaption,
.mdt-numberLine-tool .question-visual > figcaption {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.mdt-root .model-number-sentence {
  display: none;
}

.mdt-model-host > figure,
.mdt-model-host .question-visual,
.mdt-model-host .spire-model-figure {
  width: min(100%, 900px);
  margin: 0;
}

.mdt-model-host svg {
  width: 100%;
  max-height: min(58vh, 620px);
  min-height: 300px;
}

.mdt-feedback {
  min-height: 52px;
  display: grid;
  align-items: center;
  padding: 9px 14px;
  border-top: 1px solid var(--mdr-line);
  background: #f8fbfd;
  color: var(--mdr-muted);
  font-weight: 850;
  line-height: 1.3;
}

.mdt-teaching-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px;
  overflow: auto;
}

.mdt-builder-panel {
  padding: 12px;
  display: grid;
  grid-template-rows: auto auto auto minmax(0, 1fr);
  align-content: start;
  gap: 10px;
  overflow: auto;
}

.mdt-builder-panel > h2,
.mdt-question-panel h2,
.mdt-builder-control h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.15;
}

.mdt-stepper-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.mdt-builder-control {
  min-width: 0;
  display: grid;
  align-content: start;
  gap: 6px;
}

.mdt-builder-control h3 {
  min-height: 2.3em;
}

.mdt-builder-control .mdr-stepper {
  width: 100%;
  grid-template-columns: var(--mdr-touch) minmax(44px, 1fr) var(--mdr-touch);
}

.mdt-question-panel {
  min-height: 0;
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--mdr-line);
  border-radius: var(--mdr-radius);
  background: #f8fbfd;
}

.mdt-question-panel p {
  margin: 0;
  color: var(--mdr-muted);
  font-weight: 800;
  line-height: 1.35;
}

.mdt-question-panel .mdt-feedback {
  min-height: 48px;
  padding: 8px 10px;
  border: 1px solid var(--mdr-line);
  border-radius: var(--mdr-radius);
  background: #ffffff;
}

.mdt-print-sheet {
  display: none;
}

.mdt-kicker {
  margin: 0;
  color: var(--mdr-muted);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.mdt-equation {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 10px;
  border: 2px solid #9fd9ef;
  border-radius: var(--mdr-radius);
  background: #eefaff;
  font-size: clamp(1.55rem, 3vw, 2.4rem);
  font-weight: 850;
}

.mdt-equation strong {
  color: #083a55;
}

.mdt-equation-note {
  margin: 0;
  color: var(--mdr-muted);
  font-weight: 800;
  line-height: 1.35;
}

.mdt-teaching-card {
  margin-top: auto;
  padding: 12px;
  border: 1px solid var(--mdr-line);
  border-radius: var(--mdr-radius);
  background: #f8fbfd;
}

.mdt-teaching-card h2 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.mdt-teaching-card p,
.mdt-teaching-card li {
  color: var(--mdr-muted);
  font-weight: 750;
  line-height: 1.34;
}

.mdt-teaching-card p {
  margin: 0;
}

.mdt-teaching-card ol {
  margin: 9px 0 0;
  padding-left: 20px;
}

.mdt-teaching-card li + li {
  margin-top: 5px;
}

.mdt-labels-hidden figcaption,
.mdt-labels-hidden .group-label,
.mdt-labels-hidden .cuisenaire-groups-total,
.mdt-labels-hidden .number-shape-groups-total,
.mdt-labels-hidden .number-line-label,
.mdt-labels-hidden .jump-label,
.mdt-labels-hidden .bar-model-strip > span {
  color: transparent !important;
  fill: transparent !important;
  text-shadow: none !important;
}

.mdt-sentence-hidden .mdt-canvas-equation {
  visibility: hidden;
}

@media (max-width: 980px) {
  html,
  body {
    overflow: auto;
  }

  .app {
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }

  .mdt-root,
  .mdt-tool {
    overflow: visible;
  }

  .mdt-toolbar {
    flex-wrap: wrap;
    overflow: visible;
  }

  .mdt-workspace {
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .mdt-model-panel {
    min-height: 520px;
  }

  .mdt-teaching-panel {
    overflow: visible;
  }

  .mdt-builder-panel {
    overflow: visible;
  }
}

@media (max-width: 680px) {
  .mdt-workspace {
    padding: 7px;
  }

  .mdt-model-scroll {
    padding: 8px;
  }

  .mdt-model-host {
    min-height: 270px;
  }

  .mdt-model-host svg {
    min-height: 240px;
  }
}

@media print {
  @page { size: A4 landscape; margin: 7mm; }

  html,
  body {
    width: auto;
    height: auto;
    overflow: visible;
    background: #ffffff;
  }

  body > .app,
  .mdr-dialog { display: none !important; }

  .mdt-print-sheet {
    display: grid !important;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-rows: repeat(2, minmax(0, 1fr));
    gap: 4mm;
    width: 100%;
    height: 194mm;
  }

  .mdt-print-copy {
    min-width: 0;
    min-height: 0;
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    gap: 2mm;
    padding: 2.5mm;
    overflow: hidden;
    border: 0.3mm solid #8ea6b5;
    border-radius: 2mm;
    break-inside: avoid;
  }

  .mdt-print-copy .spire-print-brand img {
    width: 25mm !important;
  }

  .mdt-print-copy .spire-print-copyright {
    font-size: 6.5pt;
  }

  .mdt-print-content,
  .mdt-print-content .mdt-model-panel,
  .mdt-print-content .mdt-model-scroll,
  .mdt-print-content .mdt-model-scale,
  .mdt-print-content .mdt-model-host,
  .mdt-print-content .question-visual {
    min-height: 0;
    height: 100%;
  }

  .mdt-print-content .mdt-model-panel {
    display: grid;
    grid-template-rows: minmax(0, 1fr);
    overflow: hidden;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .mdt-print-content .mdt-model-scroll {
    gap: 1mm;
    padding: 1.5mm;
    overflow: hidden;
    background: #ffffff;
  }

  .mdt-print-content .mdt-model-scale {
    width: 100%;
    transform: none;
  }

  .mdt-print-content .mdt-model-host > figure,
  .mdt-print-content .mdt-model-host .question-visual,
  .mdt-print-content .mdt-model-host .spire-model-figure {
    width: 100%;
    max-width: none;
  }

  .mdt-print-content .mdt-model-host svg {
    width: 100%;
    height: 100%;
    min-height: 0;
    max-height: none;
  }

  .mdt-print-content .mdt-canvas-equation {
    min-height: 9mm;
    padding: 0;
    font-size: 10pt;
  }

  [data-mdt-print-representation="bar"] .bar-model-figure > figcaption,
  [data-mdt-print-representation="bar"] .model-number-sentence,
  [data-mdt-print-representation="rods"] .question-visual > figcaption,
  [data-mdt-print-representation="rods"] .cuisenaire-groups-total,
  [data-mdt-print-representation="rods"] .model-number-sentence {
    display: none !important;
  }

  [data-mdt-print-representation="numberShapes"] .question-visual > figcaption,
  [data-mdt-print-representation="numberLine"] .question-visual > figcaption {
    display: none !important;
  }

  [data-mdt-print-representation="bar"] .mdt-canvas-equation,
  [data-mdt-print-representation="rods"] .mdt-canvas-equation {
    min-height: 12mm;
    font-size: 16pt;
  }

  [data-mdt-print-representation="equalGroups"] .question-visual > figcaption {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  [data-mdt-print-representation="equalGroups"] .mdt-canvas-equation {
    min-height: 12mm;
    font-size: 16pt;
  }

  [data-mdt-print-representation="numberShapes"] .mdt-canvas-equation {
    min-height: 12mm;
    font-size: 16pt;
  }

  [data-mdt-print-representation="numberLine"] .mdt-canvas-equation {
    min-height: 12mm;
    font-size: 16pt;
  }
}