/* ============================================================
   URBot Skill Tree Visualization Styles
   Pure SVG tree with level nodes, branch lines, tooltips
   ============================================================ */

.urbot-skill-tree {
  --st-bg: #0f1117;
  --st-surface: #1a1d27;
  --st-border: #2a2d3a;
  --st-text: #e2e4ea;
  --st-text-muted: #8b8fa4;
  --st-radius: 8px;
  --st-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* Level colors */
  --st-novice: #94a3b8;
  --st-apprentice: #22c55e;
  --st-journeyman: #3b82f6;
  --st-expert: #a855f7;
  --st-master: #f59e0b;
  --st-locked: #2a2d3a;
  --st-locked-text: #4a4d5a;

  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--st-text);
  position: relative;
}

/* ---- SVG Container ---- */
.skill-tree-svg-wrap {
  width: 100%;
  overflow-x: auto;
  overflow-y: visible;
  -webkit-overflow-scrolling: touch;
}

.skill-tree-svg {
  display: block;
  margin: 0 auto;
}

/* ---- Branch Lines ---- */
.skill-tree-branch {
  fill: none;
  stroke: var(--st-border);
  stroke-width: 2;
  stroke-linecap: round;
}

.skill-tree-branch--active {
  stroke: var(--st-apprentice);
  stroke-width: 2.5;
}

.skill-tree-branch--novice { stroke: var(--st-novice); }
.skill-tree-branch--apprentice { stroke: var(--st-apprentice); }
.skill-tree-branch--journeyman { stroke: var(--st-journeyman); }
.skill-tree-branch--expert { stroke: var(--st-expert); }
.skill-tree-branch--master { stroke: var(--st-master); }

/* ---- Node Circles ---- */
.skill-tree-node {
  cursor: pointer;
  transition: transform var(--st-transition);
}

.skill-tree-node:hover {
  transform: scale(1.1);
}

.skill-tree-node-circle {
  stroke-width: 2.5;
  transition: all var(--st-transition);
}

/* Level-specific fills */
.skill-tree-node--novice .skill-tree-node-circle {
  fill: var(--st-novice);
  stroke: var(--st-novice);
}

.skill-tree-node--apprentice .skill-tree-node-circle {
  fill: var(--st-apprentice);
  stroke: var(--st-apprentice);
}

.skill-tree-node--journeyman .skill-tree-node-circle {
  fill: var(--st-journeyman);
  stroke: var(--st-journeyman);
}

.skill-tree-node--expert .skill-tree-node-circle {
  fill: var(--st-expert);
  stroke: var(--st-expert);
}

.skill-tree-node--master .skill-tree-node-circle {
  fill: var(--st-master);
  stroke: var(--st-master);
}

/* Locked nodes */
.skill-tree-node--locked .skill-tree-node-circle {
  fill: var(--st-locked);
  stroke: var(--st-locked);
  opacity: 0.5;
}

.skill-tree-node--locked .skill-tree-node-label {
  fill: var(--st-locked-text);
}

/* Current level glow */
.skill-tree-node--current .skill-tree-node-circle {
  filter: drop-shadow(0 0 8px currentColor);
  animation: st-glow 2s ease-in-out infinite alternate;
}

@keyframes st-glow {
  from {
    filter: drop-shadow(0 0 4px currentColor);
  }
  to {
    filter: drop-shadow(0 0 12px currentColor);
  }
}

/* ---- Node Labels ---- */
.skill-tree-node-label {
  font-size: 10px;
  font-weight: 600;
  text-anchor: middle;
  fill: #fff;
  pointer-events: none;
}

.skill-tree-node-sublabel {
  font-size: 8px;
  font-weight: 400;
  text-anchor: middle;
  fill: var(--st-text-muted);
  pointer-events: none;
}

/* ---- Axis Labels ---- */
.skill-tree-axis-label {
  font-size: 13px;
  font-weight: 700;
  text-anchor: middle;
  fill: var(--st-text);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.skill-tree-axis-icon {
  font-size: 18px;
  text-anchor: middle;
  fill: var(--st-text-muted);
}

.skill-tree-axis-score {
  font-size: 11px;
  font-weight: 500;
  text-anchor: middle;
  fill: var(--st-text-muted);
}

/* ---- Center Node ---- */
.skill-tree-center {
  cursor: default;
}

.skill-tree-center-circle {
  fill: var(--st-surface);
  stroke: var(--st-border);
  stroke-width: 3;
}

.skill-tree-center-label {
  font-size: 14px;
  font-weight: 700;
  text-anchor: middle;
  fill: var(--st-text);
}

.skill-tree-center-score {
  font-size: 20px;
  font-weight: 800;
  text-anchor: middle;
  fill: var(--st-master);
}

/* ---- Tooltip ---- */
.skill-tree-tooltip {
  position: fixed;
  z-index: 10000;
  max-width: 280px;
  padding: 0.85rem 1rem;
  background: var(--st-surface);
  border: 1px solid var(--st-border);
  border-radius: var(--st-radius);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.2s, transform 0.2s;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

.skill-tree-tooltip--visible {
  opacity: 1;
  transform: translateY(0);
}

.skill-tree-tooltip-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--st-text);
  margin: 0 0 0.25rem;
}

.skill-tree-tooltip-level {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}

.skill-tree-tooltip-level--novice { color: var(--st-novice); }
.skill-tree-tooltip-level--apprentice { color: var(--st-apprentice); }
.skill-tree-tooltip-level--journeyman { color: var(--st-journeyman); }
.skill-tree-tooltip-level--expert { color: var(--st-expert); }
.skill-tree-tooltip-level--master { color: var(--st-master); }
.skill-tree-tooltip-level--locked { color: var(--st-locked-text); }

.skill-tree-tooltip-desc {
  font-size: 0.78rem;
  color: var(--st-text-muted);
  line-height: 1.4;
  margin: 0 0 0.35rem;
}

.skill-tree-tooltip-unlocks {
  font-size: 0.75rem;
  color: var(--st-text);
  line-height: 1.4;
  padding-top: 0.35rem;
  border-top: 1px solid var(--st-border);
}

.skill-tree-tooltip-unlocks strong {
  color: var(--st-accent, var(--st-apprentice));
}

/* ---- Detail Panel (click) ---- */
.skill-tree-detail {
  margin-top: 1.5rem;
  padding: 1.25rem;
  background: var(--st-surface);
  border: 1px solid var(--st-border);
  border-radius: var(--st-radius);
  display: none;
}

.skill-tree-detail--open {
  display: block;
  animation: st-detail-in 0.3s ease;
}

@keyframes st-detail-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.skill-tree-detail-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.skill-tree-detail-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0;
}

.skill-tree-detail-badge {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  color: #fff;
}

.skill-tree-detail-badge--novice { background: var(--st-novice); }
.skill-tree-detail-badge--apprentice { background: var(--st-apprentice); }
.skill-tree-detail-badge--journeyman { background: var(--st-journeyman); }
.skill-tree-detail-badge--expert { background: var(--st-expert); }
.skill-tree-detail-badge--master { background: var(--st-master); }

.skill-tree-detail-desc {
  font-size: 0.9rem;
  color: var(--st-text-muted);
  line-height: 1.5;
  margin-bottom: 0.75rem;
}

.skill-tree-detail-unlocks {
  font-size: 0.85rem;
  color: var(--st-text);
  line-height: 1.5;
}

/* ---- Legend ---- */
.skill-tree-legend {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--st-border);
}

.skill-tree-legend-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  color: var(--st-text-muted);
}

.skill-tree-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.skill-tree-legend-dot--novice { background: var(--st-novice); }
.skill-tree-legend-dot--apprentice { background: var(--st-apprentice); }
.skill-tree-legend-dot--journeyman { background: var(--st-journeyman); }
.skill-tree-legend-dot--expert { background: var(--st-expert); }
.skill-tree-legend-dot--master { background: var(--st-master); }
.skill-tree-legend-dot--locked { background: var(--st-locked); opacity: 0.5; }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .skill-tree-svg-wrap {
    overflow-x: auto;
    padding-bottom: 0.5rem;
  }

  .skill-tree-legend {
    gap: 0.5rem;
  }

  .skill-tree-legend-item {
    font-size: 0.65rem;
  }

  .skill-tree-detail {
    padding: 1rem;
  }
}

@media (max-width: 480px) {
  .skill-tree-tooltip {
    max-width: 220px;
    font-size: 0.85rem;
  }
}

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  .skill-tree-node--current .skill-tree-node-circle {
    animation: none;
    filter: drop-shadow(0 0 6px currentColor);
  }

  .skill-tree-tooltip,
  .skill-tree-detail--open {
    transition: none;
    animation: none;
  }
}