/* Discovery mode supplemental styles (fallbacks and visibility fixes) */

/* Number line */
.number-line-section {
  margin: 20px 0;
  padding: 10px 0;
  text-align: center;
}

.number-line-container {
  position: relative;
  margin: 0 auto;
  max-width: 800px;
  padding: 10px;
}

.number-line {
  position: relative;
  height: 40px;
  border-bottom: 3px solid var(--primary-color);
  margin: 10px 20px;
}

.number-point {
  position: absolute;
  bottom: 0;
  transform: translateX(-50%);
  text-align: center;
}

.number-point .point-marker {
  width: 2px;
  height: 10px;
  background: var(--primary-dark);
  margin: 0 auto;
}

.number-point .point-label {
  font-size: 0.85em;
  color: var(--text-color);
}

.number-point .point-equation {
  font-size: 0.8em;
  color: var(--neutral-dark);
}

/* Visual exploration */
.visual-item {
  display: inline-block;
  background: #fff;
  border: 2px solid var(--neutral-medium);
  border-radius: 12px;
  padding: 12px;
  min-width: 140px;
}

.visual-item.highlighted {
  border-color: var(--accent-color);
  box-shadow: 0 4px 12px rgb(0 0 0 / 0.15);
}

.visual-representation .visual-groups {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
}

.visual-group {
  display: flex;
  gap: 4px;
}

.visual-object {
  font-size: 18px;
}

/* Drag and drop zone */
.lab-dropzone {
  margin-top: 16px;
  border: 2px dashed var(--primary-color);
  border-radius: 12px;
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px;
}

.lab-dropzone.drag-over {
  background: rgb(0 0 0 / 0.03);
}

.lab-dropzone.success {
  border-color: var(--accent-color);
}

.dropzone-content {
  font-weight: 600;
}

/* Touch clone for DnD */
.touch-clone {
  opacity: 0.85;
  pointer-events: none;
}

/* Ensure animation content becomes visible when animated */
.animated-equation.animate {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

.animation-step.animate {
  opacity: 1 !important;
  transform: scale(1) !important;
}

.animation-result.animate {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

/* ===== Mobile widening for Discovery mode ===== */
@media (max-width: 768px) {
  /* Let Discovery use nearly full width inside the card */
  .content-card:has(.discovery-container) {
    width: 98vw !important;
    max-width: 98vw !important;
    padding-left: 8px !important;
    padding-right: 8px !important;
  }

  /* Remove inner max-width bottlenecks */
  .discovery-container,
  .lab-selector,
  .lab-experiment,
  .number-line-container,
  .visual-exploration,
  .visual-grid,
  .optional-interaction {
    width: 100% !important;
    max-width: 100% !important;
    margin-left: 0 !important;
    margin-right: 0 !important;
  }

  /* Carousel: grow cards to use horizontal space */
  .multiplication-carousel {
    justify-content: space-between !important;
    padding-left: 0 !important;
    padding-right: 0 !important;
    gap: 12px !important;
  }

  .multiplication-carousel .carousel-item {
    width: calc(50% - 8px) !important;
    max-width: none !important;
  }

  .multiplication-carousel .equation-card {
    min-width: 0 !important;
    width: 100% !important;
  }

  /* Visual items: two columns on mobile landscape/large phones */
  .visual-grid {
    justify-content: space-between !important;
    gap: 12px !important;
  }

  .visual-grid .visual-item {
    width: calc(50% - 8px) !important;
    min-width: 0 !important;
  }
}

/* Very small phones: stack items full-width */
@media (max-width: 480px) {
  .multiplication-carousel .carousel-item {
    width: 100% !important;
  }
  .visual-grid .visual-item {
    width: 100% !important;
  }
}