/* ── Knowledge Tab Styles ── */

.knowledge-guide-link {
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
}

.knowledge-guide-link a {
  color: var(--accent, #8e44ad);
  text-decoration: none;
}

.knowledge-guide-link a:hover {
  text-decoration: underline;
}

.knowledge-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.knowledge-header h3 {
  margin: 0;
}

.knowledge-stats {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  font-size: 0.9rem;
}

.kp-display strong {
  color: var(--accent, #8e44ad);
}

.runehall-info {
  color: var(--text-secondary, #7f8c8d);
}

/* ── Experts Section ── */

.knowledge-experts {
  margin-bottom: 1.5rem;
}

.knowledge-experts h4 {
  margin: 0 0 0.5rem;
}

.expert-cards {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.expert-card {
  background: var(--bg-light, #ecf0f1);
  border: 1px solid var(--border, #bdc3c7);
  border-radius: 6px;
  padding: 0.75rem;
  min-width: 260px;
  flex: 1;
  max-width: 400px;
  overflow: hidden;
}

.expert-card .expert-name {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.expert-card .expert-meta {
  font-size: 0.8rem;
  color: var(--text-secondary, #7f8c8d);
  margin-bottom: 0.5rem;
}

.study-progress {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  max-width: 100%;
}

.study-progress > span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.study-progress.paused {
  color: var(--warning, #f39c12);
}

.study-progress.secondary-study,
.study-select.secondary-study {
  margin-top: 4px;
  padding: 6px 10px;
  border: 1px dashed rgba(142, 68, 173, 0.3);
  border-radius: 6px;
  background: rgba(142, 68, 173, 0.06);
}

.polymath-speed {
  font-size: 0.75rem;
  color: var(--warning, #f39c12);
  font-weight: 600;
}

.study-timer {
  font-variant-numeric: tabular-nums;
  color: var(--accent, #8e44ad);
}

.study-select {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.study-select select {
  flex: 1;
  min-width: 0;
  padding: 0.3rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--border, #bdc3c7);
  background: var(--bg, #fff);
  color: var(--text, #2c3e50);
  font-size: 0.85rem;
  max-width: 100%;
}

/* ── Knowledge Paths ── */

.knowledge-paths {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.knowledge-path {
  border: 1px solid var(--border, #bdc3c7);
  border-radius: 8px;
  padding: 1rem;
  background: var(--bg-light, #f8f9fa);
}

.knowledge-path h4 {
  margin: 0 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border, #bdc3c7);
}

/* ── Bracket Layout (Tournament Tree) ── */

.bracket-container {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.bracket-row {
  display: flex;
  flex-direction: row;
  align-items: center;
}

.bracket-node-wrapper {
  flex-shrink: 0;
}

/* Horizontal connector line between node and children */
.bracket-connector {
  width: 24px;
  min-width: 24px;
  height: 2px;
  background: var(--border, #bdc3c7);
  flex-shrink: 0;
  align-self: center;
}

/* Children container — stacks vertically when branching */
.bracket-children {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
}

/* Vertical line connecting branches */
.bracket-children.bracket-branching {
  padding-left: 12px;
  border-left: 2px solid var(--border, #bdc3c7);
}

/* ── Mutually Exclusive Group ── */

.bracket-exclusive-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
  padding: 0.5rem;
  border: 2px dashed var(--warning, #f39c12);
  border-radius: 6px;
  background: rgba(243, 156, 18, 0.04);
}

.bracket-exclusive-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--warning, #f39c12);
  text-align: center;
  padding: 0 0.25rem 0.25rem;
}

/* ── Node Cards ── */

.knowledge-node {
  background: var(--bg-light, #ecf0f1);
  border: 2px solid var(--border, #bdc3c7);
  border-radius: 6px;
  padding: 0.6rem 0.75rem;
  width: 220px;
  min-width: 200px;
  position: relative;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-size: 0.85rem;
}

.knowledge-node.locked {
  opacity: 0.55;
}

.knowledge-node.available {
  border-color: var(--accent, #8e44ad);
  box-shadow: 0 0 6px rgba(142, 68, 173, 0.25);
}

.knowledge-node.unlocked {
  border-color: var(--success, #27ae60);
}

.knowledge-node.exclusive {
  border-style: dashed;
}

.knowledge-node.coming-soon {
  opacity: 0.55;
}

.coming-soon-badge {
  display: inline-block;
  background: #7f8c8d;
  color: #fff;
  font-size: 0.7em;
  padding: 1px 8px;
  border-radius: 3px;
  font-weight: bold;
  letter-spacing: 0.03em;
  margin-top: 2px;
}

.node-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.2rem;
}

.node-name {
  font-weight: 600;
  font-size: 0.85rem;
}

.node-tier-badge {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-secondary, #7f8c8d);
  background: rgba(0, 0, 0, 0.06);
  padding: 1px 5px;
  border-radius: 3px;
  white-space: nowrap;
}

.node-status {
  font-size: 0.7rem;
  color: var(--text-secondary, #7f8c8d);
  display: block;
  margin-bottom: 0.25rem;
}

.node-description {
  font-size: 0.75rem;
  color: var(--text-secondary, #7f8c8d);
  margin: 0 0 0.4rem;
  line-height: 1.3;
}

.node-costs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.7rem;
  color: var(--text-secondary, #7f8c8d);
  margin-bottom: 0.4rem;
}

.node-costs .kp-cost {
  color: var(--accent, #8e44ad);
  font-weight: 600;
}

.btn-sm {
  padding: 0.25rem 0.6rem;
  font-size: 0.8rem;
}

/* ── Responsive: Stack vertically on mobile ── */

@media (max-width: 600px) {
  .bracket-container {
    flex-direction: column;
    align-items: stretch;
  }

  .bracket-row {
    flex-direction: column;
    align-items: stretch;
  }

  .bracket-node-wrapper {
    width: 100%;
  }

  .knowledge-node {
    width: 100%;
    min-width: 0;
  }

  .bracket-connector {
    width: 2px;
    height: 16px;
    min-width: 2px;
    align-self: center;
  }

  .bracket-children {
    padding-left: 1rem;
  }

  .bracket-children.bracket-branching {
    border-left: 2px solid var(--border, #bdc3c7);
    padding-left: 1rem;
  }
}