/* ═══════════════════════════════════════════════════
   OmicsLab — Skill Tree & XP Engine (Prompt 41)
   ═══════════════════════════════════════════════════ */

/* ── Nav XP bar ── */
.st-nav-bar {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: 0 .75rem;
  font-size: .72rem;
  color: var(--text-muted, #8b949e);
  white-space: nowrap;
}
.st-nav-label { font-weight: 600; color: var(--accent, #3fb950); max-width: 120px; overflow: hidden; text-overflow: ellipsis; }
.st-nav-track { width: 80px; height: 5px; background: var(--border, #30363d); border-radius: 3px; overflow: hidden; }
.st-nav-fill  { height: 100%; background: var(--accent, #3fb950); border-radius: 3px; transition: width .4s ease; }
.st-nav-xp    { font-size: .68rem; color: var(--text-muted, #8b949e); }

/* ── XP toast ── */
.st-xp-toast {
  position: fixed;
  bottom: 5rem;
  right: 1.5rem;
  background: var(--surface, #161b22);
  border: 1px solid var(--accent, #3fb950);
  border-radius: .5rem;
  padding: .45rem .9rem;
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .8rem;
  z-index: 9999;
  transform: translateY(20px);
  opacity: 0;
  transition: all .3s ease;
  pointer-events: none;
  box-shadow: 0 4px 16px rgba(0,0,0,.4);
}
.st-xp-toast--in { transform: translateY(0); opacity: 1; }
.st-xp-plus  { font-weight: 800; color: var(--accent, #3fb950); }
.st-xp-label { color: var(--text-muted, #8b949e); text-transform: capitalize; }

/* ── Skill tree wrapper ── */
.st-wrap { display: flex; flex-direction: column; gap: 1rem; }

.st-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1rem 1.25rem;
  background: var(--surface, #161b22);
  border: 1px solid var(--border, #30363d);
  border-radius: .75rem;
  flex-wrap: wrap;
}
.st-level-block { display: flex; align-items: center; gap: .75rem; }
.st-level-icon  { display: flex; align-items: center; color: var(--accent, #3fb950); }
.st-level-title { font-weight: 700; font-size: 1rem; color: var(--text-primary, #e6edf3); }
.st-level-xp    { font-size: .75rem; color: var(--text-muted, #8b949e); }

.st-progress-wrap { flex: 1; min-width: 200px; }
.st-progress-track { height: 8px; background: var(--border, #30363d); border-radius: 4px; overflow: hidden; }
.st-progress-fill  { height: 100%; background: linear-gradient(90deg, #3fb950, #58a6ff); border-radius: 4px; transition: width .6s ease; }
.st-progress-labels { display: flex; justify-content: space-between; font-size: .65rem; color: var(--text-muted, #8b949e); margin-top: .25rem; }

/* ── Canvas ── */
.st-canvas-wrap {
  background: var(--surface, #161b22);
  border: 1px solid var(--border, #30363d);
  border-radius: .75rem;
  overflow: auto;
  min-height: 500px;
  cursor: grab;
}
.st-canvas-wrap:active { cursor: grabbing; }
.st-svg { width: 100%; min-width: 900px; height: auto; display: block; }

/* ── Nodes ── */
.st-node { transition: opacity .2s; }
.st-node:hover circle:first-child { filter: brightness(1.3); }
.st-node--available { animation: st-pulse 2s ease-in-out infinite; }
@keyframes st-pulse {
  0%,100% { filter: drop-shadow(0 0 0px transparent); }
  50%      { filter: drop-shadow(0 0 6px #e3b341aa); }
}

/* ── Detail panel ── */
.st-detail {
  background: var(--surface, #161b22);
  border: 1px solid var(--border, #30363d);
  border-radius: .75rem;
  padding: 1rem 1.25rem;
  position: relative;
}
.st-detail-close {
  position: absolute;
  top: .75rem;
  right: .75rem;
  background: none;
  border: none;
  color: var(--text-muted, #8b949e);
  cursor: pointer;
  display: flex;
  padding: .2rem;
}
.st-detail-header {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-size: 1rem;
  margin-bottom: .5rem;
}
.st-detail-icon { display: flex; align-items: center; }
.st-detail-state { font-size: .7rem; padding: .15rem .5rem; border-radius: 99px; margin-left: auto; }
.st-detail-state.unlocked  { background: rgba(63,185,80,.15); color: #3fb950; }
.st-detail-state.available { background: rgba(227,179,65,.15); color: #e3b341; }
.st-detail-state.locked    { background: rgba(139,148,158,.1);  color: #8b949e; }
.st-detail-desc { font-size: .82rem; color: var(--text-secondary, #8b949e); margin: .5rem 0; }
.st-detail-meta { display: flex; gap: 1rem; flex-wrap: wrap; font-size: .75rem; color: var(--text-muted, #8b949e); }
.st-detail-meta strong { color: var(--text-primary, #e6edf3); }
.st-detail-success { display: flex; align-items: center; gap: .4rem; margin-top: .75rem; font-size: .8rem; color: #3fb950; }

/* ── Legend ── */
.st-legend {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  font-size: .72rem;
  color: var(--text-muted, #8b949e);
}
.st-leg-item { display: flex; align-items: center; gap: .4rem; }
.st-leg-dot  { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }

@media (max-width: 640px) {
  .st-header { flex-direction: column; align-items: flex-start; }
  .st-progress-wrap { width: 100%; }
  .st-canvas-wrap { min-height: 350px; }
}