/* ============================================================================
   Knowledge Page
   BEM block: .knowledge
   Replaces: .kb-page, .kb-header, .kb-title, .kb-tabs, .kb-tab,
             .kb-panel, .kb-search-bar, .kb-search-input,
             .kb-depth-selector, .kb-depth-btn,
             .kb-results-area, .kb-loading, .kb-error,
             .kb-result-header, .kb-result-meta, .kb-result-actions,
             .kb-depth-badge, .kb-summary,
             .kb-provider-status, .kb-provider-label, .kb-provider-chip,
             .kb-provider-on, .kb-provider-off,
             .kb-source-card, .kb-source-video, .kb-source-header,
             .kb-source-type, .kb-source-title, .kb-source-badge,
             .kb-source-url, .kb-source-expand, .kb-source-body,
             .kb-source-thumb, .kb-source-snippet, .kb-source-content,
             .kb-source-link,
             .kb-topic-card, .kb-topic-query, .kb-topic-meta, .kb-topic-tags,
             .kb-tag,
             .kb-deck-card, .kb-deck-info, .kb-deck-name, .kb-deck-meta,
             .kb-deck-actions,
             .kb-quiz-card, .kb-quiz-info, .kb-quiz-name, .kb-quiz-meta,
             .kb-quiz-actions,
             .kb-review-header, .kb-flashcard, .kb-flashcard-inner,
             .kb-flashcard-front, .kb-flashcard-back, .kb-flashcard-label,
             .kb-flashcard-text, .kb-flashcard-hint,
             .kb-quality-buttons, .kb-quality-btn,
             .kb-q-again, .kb-q-hard, .kb-q-good, .kb-q-easy,
             .kb-quiz-progress, .kb-quiz-progress-bar, .kb-quiz-progress-text,
             .kb-question, .kb-question-text,
             .kb-mcq-option, .kb-tf-buttons, .kb-tf-btn,
             .kb-fill-blank, .kb-fill-blank-input,
             .kb-answer-feedback, .kb-feedback-correct, .kb-feedback-wrong,
             .kb-quiz-results, .kb-score-display, .kb-score-circle,
             .kb-score-detail,
             .kb-stats-grid, .kb-stat-card, .kb-stat-value, .kb-stat-label,
             .kb-review-complete
   ============================================================================ */

@scope (beam-knowledge) {
/* -- Block ---------------------------------------------------------------- */

.knowledge {
  padding: var(--space-lg) var(--space-xl);
}

/* -- Header --------------------------------------------------------------- */

.knowledge__header {
  margin-bottom: var(--space-lg);
}

.knowledge__title {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  color: var(--color-text);
}

/* -- Tabs ----------------------------------------------------------------- */

.knowledge__tabs {
  display: flex;
  gap: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-lg);
  padding-bottom: 0;
}

.knowledge__tab {
  background: none;
  border: none;
  color: var(--color-muted);
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  font-size: var(--text-sm);
  border-bottom: 2px solid transparent;
  transition: all var(--transition-normal);
}

.knowledge__tab:hover {
  color: var(--color-text);
}

.knowledge__tab.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* -- Panels --------------------------------------------------------------- */

.knowledge__panel {
  display: none;
}

.knowledge__panel.active {
  display: block;
}

/* -- Search bar ----------------------------------------------------------- */

.knowledge__search-bar {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  margin-bottom: var(--space-lg);
}

.knowledge__search-input {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: var(--text-sm);
}

.knowledge__search-input:focus {
  outline: none;
  border-color: var(--color-accent);
}

/* -- Depth selector ------------------------------------------------------- */

.knowledge__depth-selector {
  display: flex;
  gap: 2px;
}

.knowledge__depth-btn {
  width: 28px;
  height: 28px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-muted);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.knowledge__depth-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
}

.knowledge__depth-btn.active {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

/* -- Results area --------------------------------------------------------- */

.knowledge__results-area {
  min-height: 200px;
}

.knowledge__loading {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-muted);
  padding: var(--space-xl);
  justify-content: center;
}

.knowledge__error {
  color: var(--color-danger);
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* -- Result header -------------------------------------------------------- */

.knowledge__result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.knowledge__result-meta {
  display: flex;
  gap: var(--space-md);
  align-items: center;
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.knowledge__result-actions {
  display: flex;
  gap: var(--space-xs);
}

.knowledge__depth-badge {
  background: var(--color-accent);
  color: var(--color-bg);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
}

.knowledge__summary {
  padding: var(--space-md);
  background: var(--color-hover);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-text);
  white-space: pre-wrap;
}

/* -- Provider status ------------------------------------------------------ */

.knowledge__provider-status {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0;
  font-size: var(--text-xs);
  flex-wrap: wrap;
}

.knowledge__provider-label {
  color: var(--color-muted);
  margin-right: 0.2rem;
}

.knowledge__provider-chip {
  padding: 0.15rem var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
}

.knowledge__provider-chip--on {
  background: rgba(80, 250, 123, 0.12);
  color: var(--color-success);
}

.knowledge__provider-chip--off {
  background: rgba(255, 85, 85, 0.08);
  color: var(--color-muted);
  text-decoration: line-through;
  cursor: help;
}

/* -- Source cards ---------------------------------------------------------- */

.knowledge__source-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  overflow: hidden;
}

.knowledge__source-card--video {
  border-left: 3px solid var(--color-danger);
}

.knowledge__source-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  font-size: var(--text-sm);
}

.knowledge__source-header:hover {
  background: var(--color-hover);
}

.knowledge__source-type {
  opacity: 0.5;
  flex-shrink: 0;
}

.knowledge__source-title {
  flex: 1;
  font-weight: var(--weight-medium);
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.knowledge__source-badge {
  font-size: var(--text-xs);
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-sm);
  background: var(--color-hover);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  flex-shrink: 0;
}

.knowledge__source-url {
  font-size: var(--text-xs);
  color: var(--color-muted);
}

.knowledge__source-expand {
  transition: transform var(--transition-normal);
}

.knowledge__source-card.expanded .knowledge__source-expand {
  transform: rotate(180deg);
}

.knowledge__source-body {
  display: none;
  padding: var(--space-sm) var(--space-md);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
}

.knowledge__source-card.expanded .knowledge__source-body {
  display: block;
}

.knowledge__source-thumb {
  margin-bottom: var(--space-sm);
}

.knowledge__source-thumb img {
  max-width: 240px;
  border-radius: var(--radius-md);
  display: block;
}

.knowledge__source-snippet {
  color: var(--color-muted);
  margin-bottom: var(--space-sm);
}

.knowledge__source-content {
  color: var(--color-text);
  line-height: 1.5;
  margin-bottom: var(--space-sm);
}

.knowledge__source-link {
  color: var(--color-accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

/* -- Library: topic cards ------------------------------------------------- */

.knowledge__topic-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.knowledge__topic-card:hover {
  background: var(--color-hover);
}

.knowledge__topic-query {
  font-weight: var(--weight-medium);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.knowledge__topic-meta {
  display: flex;
  gap: var(--space-md);
  font-size: var(--text-xs);
  color: var(--color-muted);
}

.knowledge__topic-tags {
  display: flex;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.knowledge__tag {
  background: var(--color-hover);
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-muted);
}

/* -- Library heading ------------------------------------------------------ */

.knowledge__library-heading {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--color-text);
  margin: var(--space-lg) 0 var(--space-md);
}

/* -- Claude Code Intel section -------------------------------------------- */

.knowledge__intel-section {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  overflow: hidden;
}

.knowledge__intel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.knowledge__intel-header:hover {
  background: var(--color-hover);
}

.knowledge__intel-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.knowledge__intel-title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text);
  margin: 0;
}

.knowledge__intel-badge {
  font-size: var(--text-xs);
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-sm);
  background: rgba(139, 92, 246, 0.15);
  color: var(--color-accent);
  font-weight: var(--weight-medium);
}

.knowledge__intel-chevron {
  transition: transform var(--transition-normal);
}

.knowledge__intel-section.expanded .knowledge__intel-chevron {
  transform: rotate(180deg);
}

.knowledge__intel-body {
  display: none;
  padding: 0 var(--space-md) var(--space-md);
  border-top: 1px solid var(--color-border);
}

.knowledge__intel-section.expanded .knowledge__intel-body {
  display: block;
}

.knowledge__intel-summary {
  font-size: var(--text-sm);
  color: var(--color-muted);
  padding: var(--space-md) 0 var(--space-sm);
  line-height: 1.5;
}

.knowledge__intel-subheading {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: var(--space-md) 0 var(--space-sm);
}

/* -- Intel page cards ----------------------------------------------------- */

.knowledge__intel-page {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-xs);
  overflow: hidden;
}

.knowledge__intel-page-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  font-size: var(--text-sm);
}

.knowledge__intel-page-header:hover {
  background: var(--color-hover);
}

.knowledge__intel-page-name {
  font-weight: var(--weight-medium);
  color: var(--color-text);
  flex: 1;
}

.knowledge__intel-page-meta {
  font-size: var(--text-xs);
  color: var(--color-muted);
}

.knowledge__intel-page-body {
  display: none;
  padding: var(--space-sm) var(--space-md);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
}

.knowledge__intel-page.expanded .knowledge__intel-page-body {
  display: block;
}

.knowledge__intel-page.expanded .knowledge__intel-chevron {
  transform: rotate(180deg);
}

.knowledge__intel-page-title {
  color: var(--color-muted);
  font-size: var(--text-xs);
  margin-bottom: var(--space-sm);
}

/* -- Section diffs -------------------------------------------------------- */

.knowledge__intel-diffs {
  margin-bottom: var(--space-sm);
}

.knowledge__intel-diff-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.2rem 0;
  font-size: var(--text-xs);
}

.knowledge__intel-status {
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-sm);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-size: 0.65rem;
}

.knowledge__intel-status--added {
  background: rgba(80, 250, 123, 0.15);
  color: var(--color-success);
}

.knowledge__intel-status--changed {
  background: rgba(255, 184, 108, 0.15);
  color: var(--color-warning);
}

.knowledge__intel-status--removed {
  background: rgba(255, 85, 85, 0.15);
  color: var(--color-danger);
}

.knowledge__intel-heading {
  color: var(--color-text);
}

/* -- Keywords ------------------------------------------------------------- */

.knowledge__intel-keywords {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-wrap: wrap;
  margin-bottom: var(--space-sm);
  font-size: var(--text-xs);
}

.knowledge__intel-keywords-label {
  color: var(--color-muted);
}

.knowledge__intel-keyword {
  background: rgba(139, 92, 246, 0.12);
  color: var(--color-accent);
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
}

.knowledge__intel-wordcount {
  font-size: var(--text-xs);
  color: var(--color-muted);
  margin-bottom: var(--space-sm);
}

.knowledge__intel-empty {
  font-size: var(--text-sm);
  color: var(--color-muted);
  padding: var(--space-sm) 0;
}

/* -- Timeline ------------------------------------------------------------- */

.knowledge__intel-timeline {
  font-size: var(--text-xs);
}

.knowledge__intel-timeline-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--color-border);
}

.knowledge__intel-timeline-row:last-child {
  border-bottom: none;
}

.knowledge__intel-timeline-date {
  color: var(--color-muted);
  min-width: 5.5rem;
}

.knowledge__intel-timeline-slug {
  font-weight: var(--weight-medium);
  color: var(--color-text);
  flex: 1;
}

.knowledge__intel-timeline-sections {
  color: var(--color-muted);
}

.knowledge__intel-timeline-kws {
  color: var(--color-accent);
  font-size: 0.65rem;
}

/* -- Deck / Quiz cards ---------------------------------------------------- */

.knowledge__deck-card,
.knowledge__quiz-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
}

.knowledge__deck-name,
.knowledge__quiz-name {
  font-weight: var(--weight-medium);
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.knowledge__deck-meta,
.knowledge__quiz-meta {
  font-size: var(--text-xs);
  color: var(--color-muted);
  margin-top: 0.15rem;
}

.knowledge__deck-actions,
.knowledge__quiz-actions {
  display: flex;
  gap: var(--space-xs);
}

/* -- Flashcard review ----------------------------------------------------- */

.knowledge__review-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.knowledge__flashcard {
  perspective: 1000px;
  width: 100%;
  max-width: 500px;
  height: 280px;
  margin: 0 auto var(--space-lg);
  cursor: pointer;
}

.knowledge__flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}

.knowledge__flashcard.flipped .knowledge__flashcard-inner {
  transform: rotateY(180deg);
}

.knowledge__flashcard-front,
.knowledge__flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  background: var(--color-bg);
}

.knowledge__flashcard-back {
  transform: rotateY(180deg);
  background: var(--color-hover);
}

.knowledge__flashcard-label {
  font-size: var(--text-xs);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.knowledge__flashcard-text {
  font-size: var(--text-lg);
  color: var(--color-text);
  line-height: 1.5;
}

.knowledge__flashcard-hint {
  font-size: var(--text-xs);
  color: var(--color-muted);
  margin-top: auto;
}

/* -- Quality buttons ------------------------------------------------------ */

.knowledge__quality-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
}

.knowledge__quality-btn {
  padding: var(--space-sm) var(--space-xl);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  background: var(--color-bg);
  transition: all var(--transition-fast);
}

.knowledge__quality-btn--again {
  color: var(--color-danger);
  border-color: var(--color-danger);
}

.knowledge__quality-btn--again:hover {
  background: var(--color-danger);
  color: var(--color-bg);
}

.knowledge__quality-btn--hard {
  color: var(--color-warning);
  border-color: var(--color-warning);
}

.knowledge__quality-btn--hard:hover {
  background: var(--color-warning);
  color: var(--color-bg);
}

.knowledge__quality-btn--good {
  color: var(--color-success);
  border-color: var(--color-success);
}

.knowledge__quality-btn--good:hover {
  background: var(--color-success);
  color: var(--color-bg);
}

.knowledge__quality-btn--easy {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.knowledge__quality-btn--easy:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* -- Quiz progress -------------------------------------------------------- */

.knowledge__quiz-progress {
  position: relative;
  height: 24px;
  background: var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  overflow: hidden;
}

.knowledge__quiz-progress-bar {
  height: 100%;
  background: var(--color-accent);
  transition: width 0.3s;
  border-radius: var(--radius-md);
}

.knowledge__quiz-progress-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-text);
}

/* -- Quiz question -------------------------------------------------------- */

.knowledge__question {
  margin-bottom: var(--space-lg);
}

.knowledge__question-text {
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  line-height: 1.5;
}

.knowledge__mcq-option {
  display: block;
  width: 100%;
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 0.4rem;
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
}

.knowledge__mcq-option:hover {
  border-color: var(--color-accent);
  background: var(--color-hover);
}

.knowledge__tf-buttons {
  display: flex;
  gap: var(--space-sm);
}

.knowledge__tf-btn {
  flex: 1;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  transition: all var(--transition-fast);
}

.knowledge__tf-btn:hover {
  border-color: var(--color-accent);
}

.knowledge__fill-blank {
  display: flex;
  gap: var(--space-sm);
}

.knowledge__fill-blank-input {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: var(--text-sm);
}

/* -- Answer feedback ------------------------------------------------------ */

.knowledge__answer-feedback {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  margin-top: var(--space-sm);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--text-sm);
  animation: knowledgeFadeIn var(--transition-normal);
}

.knowledge__answer-feedback--correct {
  background: rgba(74, 222, 128, 0.15);
  color: var(--color-success);
}

.knowledge__answer-feedback--wrong {
  background: rgba(248, 113, 113, 0.15);
  color: var(--color-danger);
}

@keyframes knowledgeFadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* -- Quiz results --------------------------------------------------------- */

.knowledge__quiz-results {
  text-align: center;
  padding: var(--space-xl);
}

.knowledge__score-display {
  margin: var(--space-xl) 0;
}

.knowledge__score-circle {
  width: 120px;
  height: 120px;
  margin: 0 auto;
}

.knowledge__score-detail {
  font-size: var(--text-sm);
  color: var(--color-muted);
  margin-bottom: var(--space-xl);
}

/* -- Stats grid ----------------------------------------------------------- */

.knowledge__stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-md);
}

.knowledge__stat-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
}

.knowledge__stat-value {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--color-accent);
}

.knowledge__stat-label {
  font-size: var(--text-xs);
  color: var(--color-muted);
  margin-top: var(--space-xs);
}

/* -- Review complete ------------------------------------------------------ */

.knowledge__review-complete {
  text-align: center;
  padding: var(--space-xl);
}

.knowledge__review-complete h3 {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

/* -- Responsive ----------------------------------------------------------- */

@media (max-width: 640px) {
  .knowledge {
    padding: var(--space-sm);
  }

  .knowledge__search-bar {
    flex-wrap: wrap;
  }

  .knowledge__search-input {
    min-width: 100%;
  }

  .knowledge__flashcard {
    height: 220px;
  }

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

/* =============================================================================
   Media Download & Library
   ============================================================================= */

.knowledge__source-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.knowledge__download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.knowledge__download-btn:disabled {
  opacity: 0.6;
  cursor: default;
}

.knowledge__local-badge {
  color: var(--success);
  flex-shrink: 0;
  margin-left: auto;
  margin-right: 0.25rem;
}

.knowledge__media-player {
  margin-bottom: 0.75rem;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-darker, #000);
}

.knowledge__media-player video,
.knowledge__media-player audio {
  width: 100%;
  display: block;
  max-height: 400px;
}

.knowledge__media-player audio {
  height: 42px;
}

/* Media Library Section */

.knowledge__media-section {
  margin-top: 1.5rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.knowledge__media-download-bar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.knowledge__media-url-input {
  flex: 1;
  padding: 0.5rem 0.75rem;
  background: var(--bg-input, var(--bg));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.875rem;
}

.knowledge__media-url-input:focus {
  outline: none;
  border-color: var(--primary);
}

.knowledge__media-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.knowledge__media-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card, var(--bg));
  overflow: hidden;
}

.knowledge__media-card.expanded .knowledge__media-card-body {
  display: block;
}

.knowledge__media-card.expanded .knowledge__source-expand {
  transform: rotate(180deg);
}

.knowledge__media-card-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 0.75rem;
  cursor: pointer;
  user-select: none;
}

.knowledge__media-card-header:hover {
  background: var(--bg-hover);
}

.knowledge__media-card-icon {
  flex-shrink: 0;
  color: var(--text-muted);
}

.knowledge__media-card-title {
  font-weight: 500;
  font-size: 0.875rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  min-width: 0;
}

.knowledge__media-card-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.knowledge__media-card-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.knowledge__media-card-body {
  display: none;
  padding: 0.75rem;
  border-top: 1px solid var(--border);
}

.knowledge__media-card-detail {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.spinner--sm {
  width: 14px;
  height: 14px;
  display: inline-block;
}
}