.er-sidebar-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: #333;
}

.er-topic-list {
  list-style: none;
  padding: 0;
}

.er-topic-list li {
  margin-bottom: 5px;
  border-bottom: 1px solid #eaeaea;
  padding-bottom: 5px;
}

.er-topic-list li:last-child {
  border-bottom: none;
}

.er-topic-section {
  margin-bottom: 1.25rem;
}

.er-topic-section:last-child {
  margin-bottom: 0;
}

.er-topic-section-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--kdb-navy-color);
  margin-bottom: 0.5rem;
}

.er-topic-list a {
  text-decoration: none;
  color: #333;
  display: block;
  padding: 8px 12px;
  border-radius: 6px;
  font-weight: 600;
  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}

.er-topic-list a:hover {
  background-color: rgba(249, 109, 0, 0.08);
  color: var(--kdb-orange-color);
}

.er-topic-list li.active a {
  background-color: var(--kdb-navy-color);
  color: var(--text-color-white);
  font-weight: bold;
}

/* Desktop Topic List Scrollbar */
@media (min-width: 992px) {
  .er-topic-list {
    max-height: 320px; /* Fits approx 6 items before scrolling */
    overflow-y: auto !important;
    padding-right: 5px; /* Space for scrollbar */
    scrollbar-width: thin;
    scrollbar-color: #ccc #f1f1f1;
  }

  /* Custom webkit scrollbar for Chrome/Safari */
  .er-topic-list::-webkit-scrollbar {
    width: 6px;
  }

  .er-topic-list::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
  }

  .er-topic-list::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 10px;
  }

  .er-topic-list::-webkit-scrollbar-thumb:hover {
    background: #999;
  }
}

#passage-column p,
#passage-column ul li {
  font-size: 1.1rem;
  line-height: 1.6;
}

#question-column p,
#question-column label {
  font-size: 1.1rem;
  line-height: 1.6;
}

.ged-passage-copy > *:last-child,
.ged-stimulus-description:last-child,
.ged-stimulus-caption:last-child {
  margin-bottom: 0;
}

.ged-stimulus-set {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

.ged-stimulus-set--compact {
  gap: 0.75rem;
}

.ged-stimulus-card {
  background: linear-gradient(180deg, #ffffff 0%, #f7f9fc 100%);
  border: 1px solid rgba(30, 58, 95, 0.12);
  border-radius: 16px;
  padding: 1rem;
  box-shadow: 0 12px 30px rgba(30, 58, 95, 0.08);
}

.ged-stimulus-title {
  color: var(--kdb-navy-color);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 0.35rem;
}

.ged-stimulus-description,
.ged-stimulus-caption {
  color: #526174;
  font-size: 0.92rem;
}

.ged-stimulus-body {
  overflow-x: auto;
}

.ged-stimulus-table {
  min-width: 320px;
}

.ged-stimulus-table th {
  background-color: rgba(30, 58, 95, 0.08);
  color: var(--kdb-navy-color);
  font-weight: 700;
}

.ged-stimulus-table td,
.ged-stimulus-table th {
  padding: 0.75rem;
  text-align: center;
}

.ged-number-line {
  position: relative;
  padding: 2.25rem 0.5rem 0.25rem;
  min-width: 320px;
}

.ged-number-line__track {
  position: absolute;
  left: 0.5rem;
  right: 0.5rem;
  top: 2.1rem;
  height: 4px;
  background: linear-gradient(
    90deg,
    rgba(30, 58, 95, 0.85) 0%,
    rgba(249, 109, 0, 0.85) 100%
  );
  border-radius: 999px;
}

.ged-number-line__ticks {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(38px, 1fr);
  align-items: start;
}

.ged-number-line__tick {
  position: relative;
  text-align: center;
  padding-top: 1.35rem;
}

.ged-number-line__tick::before {
  content: "";
  position: absolute;
  top: 0.45rem;
  left: 50%;
  width: 2px;
  height: 16px;
  background: rgba(30, 58, 95, 0.65);
  transform: translateX(-50%);
}

.ged-number-line__tick--point::before {
  background: var(--kdb-orange-color);
}

.ged-number-line__marker {
  position: absolute;
  top: 0.05rem;
  left: 50%;
  width: 12px;
  height: 12px;
  background: var(--kdb-orange-color);
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 4px 8px rgba(30, 58, 95, 0.18);
  transform: translateX(-50%);
}

.ged-number-line__marker--open {
  background: #fff;
  border-color: var(--kdb-orange-color);
}

.ged-number-line__point-label {
  display: block;
  color: var(--kdb-orange-color);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.15rem;
}

.ged-number-line__value {
  display: block;
  margin-top: 1rem;
  line-height: 1.1;
  color: var(--kdb-navy-color);
  font-size: 0.95rem;
  font-weight: 600;
}

.ged-graph-wrap,
.ged-shape-wrap {
  min-width: 320px;
}

.ged-coordinate-graph,
.ged-shape-diagram {
  width: 100%;
  height: auto;
  display: block;
  background: #fff;
  border: 1px solid rgba(30, 58, 95, 0.12);
  border-radius: 14px;
}

.ged-graph__grid {
  stroke: rgba(30, 58, 95, 0.14);
  stroke-width: 1;
}

.ged-graph__axis {
  stroke: rgba(30, 58, 95, 0.85);
  stroke-width: 1.8;
}

.ged-graph__segment {
  stroke: var(--kdb-orange-color);
  stroke-width: 3;
}

.ged-graph__point {
  fill: var(--kdb-orange-color);
  stroke: #fff;
  stroke-width: 2;
}

.ged-graph__axis-label,
.ged-graph__point-label,
.ged-shape-diagram__label {
  fill: var(--kdb-navy-color);
  font-size: 11px;
  font-weight: 600;
}

.ged-stimulus-html svg {
  max-width: 100%;
  height: auto;
}

@media (min-width: 992px) {
  #question-visual-container {
    width: 90%;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
  }

  #question-visual-container .ged-stimulus-card {
    width: 90%;
    max-width: none;
    margin-left: auto;
    margin-right: auto;
  }

  #question-visual-container .ged-number-line,
  #question-visual-container .ged-graph-wrap,
  #question-visual-container .ged-shape-wrap,
  #question-visual-container .ged-stimulus-html svg,
  #question-visual-container .ged-stimulus-table {
    width: 90%;
    max-width: none;
    margin-left: auto;
    margin-right: auto;
  }

  #question-visual-container .ged-stimulus-html svg {
    display: block;
    height: auto;
  }
}

@media (min-width: 1400px) {
  #question-visual-container {
    width: 75%;
    max-width: 1320px;
  }
}

@media (max-width: 767.98px) {
  .ged-stimulus-card {
    padding: 0.85rem;
    border-radius: 14px;
  }

  .ged-number-line,
  .ged-graph-wrap,
  .ged-shape-wrap,
  .ged-stimulus-table {
    min-width: 0;
  }
}

/* Ad placement specific styles */
.ktb-ad-wrapper {
  /* Core Web Vitals: Reserve space to prevent CLS */
  min-height: 250px;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 20px 0;
  background-color: #f9f9f9;
  border: 1px dashed #e0e0e0;
}

.ktb-ad-sidebar {
  position: sticky;
  top: 90px; /* Accommodates sticky header if present */
}

/* Responsive Ad Wrapper scaling for mobile devices */
@media (max-width: 991.98px) {
  .ktb-ad-wrapper {
    min-height: 100px !important;
    height: auto !important;
  }
}