/* ── Polish & Historical Enrichment (WS6) ──────────────────────
   Fun facts toggle, timeline, onboarding v2, breadcrumbs, tab hints.
   ────────────────────────────────────────────────────────────────── */

/* ── Fun Facts Toggle (nav bar) ──────────────────────────────── */
.fun-facts-group {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  margin-right: var(--sp-2);
}

.fun-facts-group label {
  font-size: 10px;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

/* ── Fun Fact (i) Icons ──────────────────────────────────────── */
.help-tip--fun-fact {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  font-size: 9px;
  font-weight: 700;
  font-style: italic;
  color: var(--info);
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 50%;
  cursor: pointer;
  margin-left: var(--sp-1);
  vertical-align: middle;
  transition: all var(--transition-fast);
  position: relative;
}

.help-tip--fun-fact:hover {
  background: rgba(59, 130, 246, 0.25);
  border-color: rgba(59, 130, 246, 0.5);
  transform: scale(1.1);
}

/* ── Fun Fact Popover ────────────────────────────────────────── */
.fun-fact-popover {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 0;
  z-index: 50;
  min-width: 260px;
  max-width: 360px;
  padding: var(--sp-3);
  font-size: var(--text-xs);
  line-height: 1.6;
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-sm);
  animation: fadeIn 0.15s ease-out;
}

.fun-fact-popover__title {
  font-weight: 700;
  color: var(--text-accent);
  margin-bottom: var(--sp-2);
  font-size: var(--text-sm);
}

.fun-fact-popover__body {
  color: var(--text-secondary);
}

/* ── COBOL Timeline Modal ────────────────────────────────────── */
.timeline-body {
  max-height: 70vh;
  overflow-y: auto;
  padding: var(--sp-4);
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  position: relative;
  padding-left: 60px;
}

/* Vertical track line */
.timeline::before {
  content: '';
  position: absolute;
  left: 44px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--glass-border);
}

.timeline__milestone {
  position: relative;
  padding: var(--sp-2) var(--sp-3);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  transition: border-color var(--transition-fast);
}

.timeline__milestone:hover {
  border-color: rgba(59, 130, 246, 0.3);
}

/* Track dot on the line */
.timeline__milestone::before {
  content: '';
  position: absolute;
  left: -22px;
  top: 14px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--glass-border);
  background: var(--bg-surface);
}

.timeline__milestone--language::before { border-color: var(--success); background: rgba(34, 197, 94, 0.3); }
.timeline__milestone--hardware::before { border-color: var(--info); background: rgba(59, 130, 246, 0.3); }
.timeline__milestone--project::before { border-color: #f59e0b; background: rgba(245, 158, 11, 0.3); }

.timeline__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--text-primary);
  margin-right: var(--sp-2);
}

.timeline__track-badge {
  font-size: 9px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  vertical-align: middle;
}

.timeline__milestone--language .timeline__track-badge {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
}

.timeline__milestone--hardware .timeline__track-badge {
  background: rgba(59, 130, 246, 0.15);
  color: var(--info);
}

.timeline__milestone--project .timeline__track-badge {
  background: rgba(245, 158, 11, 0.15);
  color: #f59e0b;
}

.timeline__title {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--text-primary);
  margin-top: var(--sp-1);
}

.timeline__desc {
  font-size: var(--text-xs);
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 2px;
}

/* ── Onboarding v2 (multi-step walkthrough) ──────────────────── */
.onboarding-v2-overlay {
  z-index: 100;
}

.onboarding-v2 {
  max-width: 480px;
  width: 90vw;
  padding: var(--sp-6);
  text-align: center;
}

.onboarding-v2__content {
  min-height: 180px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
}

.onboarding-v2__icon {
  font-size: 2.5rem;
  margin-bottom: var(--sp-2);
}

.onboarding-v2__title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.onboarding-v2__body {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 400px;
  margin: 0;
}

.onboarding-v2__body strong {
  color: var(--text-primary);
}

/* Progress dots */
.onboarding-v2__progress {
  display: flex;
  justify-content: center;
  gap: var(--sp-2);
  margin: var(--sp-4) 0 var(--sp-3);
}

.onboarding-v2__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--glass-border);
  transition: all var(--transition-fast);
}

.onboarding-v2__dot--active {
  background: var(--text-accent);
  transform: scale(1.3);
}

/* Action buttons */
.onboarding-v2__actions {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-2);
}

/* ── Tab Hint ("Start here →") ───────────────────────────────── */
.tab-hint {
  position: absolute;
  top: -24px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 10px;
  font-weight: 600;
  color: var(--success);
  background: rgba(34, 197, 94, 0.15);
  border: 1px solid rgba(34, 197, 94, 0.3);
  border-radius: 4px;
  padding: 2px 8px;
  white-space: nowrap;
  pointer-events: none;
  animation: hintPulse 2s ease-in-out infinite;
  z-index: 10;
}

@keyframes hintPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ── Breadcrumb Bar ──────────────────────────────────────────── */
.breadcrumb-bar {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  padding: var(--sp-1) var(--sp-4);
  font-size: 10px;
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--glass-border);
  min-height: 0;
  overflow: hidden;
}

.breadcrumb-bar:empty {
  display: none;
}

.breadcrumb__item {
  cursor: pointer;
  padding: 1px 6px;
  border-radius: 3px;
  transition: all var(--transition-fast);
  max-width: 150px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.breadcrumb__item:hover {
  background: rgba(59, 130, 246, 0.1);
  color: var(--text-accent);
}

.breadcrumb__sep {
  color: var(--glass-border);
  font-size: 8px;
}

.breadcrumb__overflow {
  color: var(--text-muted);
  cursor: pointer;
  padding: 1px 4px;
}

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