/* ════════════════════════════════════════════════════════════════
   Behavior Trees from Scratch · Tutorial-specific styles
   Builds on tutorial.css design tokens.
   ════════════════════════════════════════════════════════════════ */

/* ── History timeline (same shape as other tutorials) ──────────── */
.sort-timeline {
  margin: 1.75rem 0 2.25rem;
  border-left: 1px solid var(--tut-border);
  padding-left: 1.25rem;
}

.sort-timeline-row {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 1.25rem;
  padding: 0.55rem 0;
  align-items: baseline;
}

.sort-timeline-year {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--tut-accent);
  font-weight: 600;
  letter-spacing: 0.04em;
  position: relative;
}

.sort-timeline-year::before {
  content: '';
  position: absolute;
  left: -1.95rem;
  top: 0.4em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--tut-accent);
  box-shadow: 0 0 0 3px rgba(167, 139, 250, 0.15);
}

.sort-timeline-body {
  font-size: 0.97rem;
  line-height: 1.65;
  color: var(--tut-soft);
}

.sort-timeline-body strong { color: var(--tut-text); font-weight: 600; }

/* ── Code blocks ─────────────────────────────────────────────────── */
pre.code code {
  font-family: inherit;
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  white-space: pre;
  display: block;
}

/* ── Card visual on the home index for this tutorial ─────────────── */
.tut-card-visual.bt-bg,
.game-card-visual.bt-bg {
  background:
    radial-gradient(circle at 30% 35%, rgba(52, 211, 153, 0.30), transparent 45%),
    radial-gradient(circle at 70% 60%, rgba(251, 191, 36, 0.22), transparent 45%),
    linear-gradient(135deg, #0a1a16 0%, #0d0a1a 50%, #0a0f1f 100%);
}

/* ── BT node type legend ────────────────────────────────────────── */
.bt-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  margin-top: 0.5rem;
}

.bt-legend .bt-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--tut-soft);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--tut-border-soft);
}

.bt-legend .bt-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  box-shadow: 0 0 6px currentColor;
}

/* ── Comparison table (BT vs GOAP vs HTN) ──────────────────────── */
.compare-table {
  margin: 1.75rem 0;
  overflow-x: auto;
}

.compare-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.compare-table th,
.compare-table td {
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--tut-border);
  text-align: left;
  color: var(--tut-soft);
}

.compare-table th {
  background: var(--tut-surface);
  color: var(--tut-text);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

.compare-table td strong {
  color: var(--tut-text);
}

/* ── Side-by-side widget panels ─────────────────────────────────── */
.bt-side-by-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 720px) {
  .bt-side-by-side { grid-template-columns: 1fr; }
}