/* ══════════════════════════════════════
   Left Toolbar
   ══════════════════════════════════════ */

#toolbar {
  width: var(--toolbar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-md) 0;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.toolbar-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.toolbar-divider {
  width: 24px;
  height: 1px;
  background: var(--border-default);
  margin: var(--space-md) 0;
}

.tool-btn {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  position: relative;
}

.tool-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.tool-btn.active {
  background: var(--accent-primary-glow);
  color: var(--accent-primary);
  box-shadow: inset 0 0 0 1px var(--accent-primary);
}

.tool-btn::after {
  content: attr(title);
  position: absolute;
  left: calc(100% + 8px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-elevated);
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-default);
  box-shadow: var(--shadow-md);
  z-index: 100;
}

.tool-btn:hover::after {
  opacity: 1;
}