/**
 * Conceptual Definitions & Terminology Section Styles
 * Plain white, minimalist academic aesthetic, no neon, no emojis.
 */

.definitions-section {
  background: var(--bg-primary);
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
  margin: 1.25rem 0 2rem 0;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-fast);
}

.definitions-section.is-collapsed {
  padding: 0.85rem 1.25rem;
  background: var(--bg-secondary);
}

.definitions-section-header {
  margin-bottom: 0.5rem;
}

.definitions-section.is-collapsed .definitions-section-header {
  margin-bottom: 0;
}

.def-section-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.def-section-title {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.def-section-step-hint {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.def-toggle-btn {
  background: var(--bg-primary);
  border: 1px solid var(--border-medium);
  border-radius: 4px;
  padding: 0.35rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.def-toggle-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-dark);
}

.def-section-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.45;
  margin-top: 0.35rem;
}

.definitions-section.is-collapsed .def-section-desc {
  display: none;
}

/* Collapsible wrapper */
.def-collapsible-content {
  display: flex;
  flex-direction: column;
}

.definitions-section.is-collapsed .def-collapsible-content {
  display: none;
}

/* Pills Bar */
.def-pills-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1rem 0 1.25rem 0;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-light);
}

.def-pill-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: 20px;
  padding: 0.35rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.def-pill-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-main);
  border-color: var(--border-dark);
}

.def-pill-btn.active {
  background: var(--text-main);
  color: #ffffff;
  border-color: var(--text-main);
}

.def-pill-btn.active .def-pill-num {
  background: rgba(255, 255, 255, 0.25);
  color: #ffffff;
}

.def-pill-num {
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  background: var(--bg-tertiary);
  color: var(--text-dim);
  padding: 0.05rem 0.35rem;
  border-radius: 10px;
  line-height: 1.2;
}

/* Selected Definition Card Content */
.def-display-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 1.25rem 1.35rem;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.def-card-top-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.75rem;
}

.def-card-term-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

.def-card-badges {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.def-badge-scale {
  font-size: 0.6875rem;
  font-weight: 600;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.15rem 0.45rem;
  border-radius: 3px;
  background: var(--bg-secondary);
  color: var(--text-muted);
  border: 1px solid var(--border-medium);
}

.def-badge-cat {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.15rem 0.45rem;
  border-radius: 3px;
  background: #f1f5f9;
  color: var(--text-main);
  border: 1px solid var(--border-medium);
}

/* Definition Content Blocks */
.def-block-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.def-block-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
}

.def-summary-text {
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.6;
}

/* Misconceptions Callout */
.def-misconceptions-box {
  background: #fcfcfc;
  border: 1px solid var(--border-medium);
  border-left: 4px solid var(--text-main);
  border-radius: 4px;
  padding: 0.875rem 1.125rem;
}

.def-misconceptions-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 0.35rem;
}

.def-misconception-item {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-muted);
  padding-left: 0.85rem;
  position: relative;
}

.def-misconception-item::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--text-main);
  font-weight: bold;
}

.def-misconception-item strong {
  color: var(--text-main);
}

/* Spin Spectrum Breakdown Table / Cards */
.def-spin-table {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.75rem;
  margin-top: 0.35rem;
}

.def-spin-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.def-spin-val {
  font-size: 0.875rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-main);
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.25rem;
}

.def-spin-meaning {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.def-spin-examples {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  margin-top: auto;
  padding-top: 0.35rem;
  border-top: 1px dashed var(--border-light);
}

.def-spin-examples strong {
  color: var(--text-main);
}

/* Relationships */
.def-relationships-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.55;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 0.75rem 1rem;
}

/* Discovery & History */
.def-history-box {
  font-size: 0.8125rem;
  color: var(--text-muted);
  border-top: 1px dashed var(--border-medium);
  padding-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.def-history-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.def-history-row strong {
  color: var(--text-main);
}

/* Related particle jump pills */
.def-jump-pills-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.35rem;
}

.def-jump-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
  margin-right: 0.25rem;
}

.def-jump-btn {
  background: #ffffff;
  border: 1px solid var(--border-medium);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-main);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.def-jump-btn:hover {
  background: var(--bg-secondary);
  border-color: var(--border-dark);
  color: var(--focus-ring);
}