/*
 * The pane toggle strip — a slim vertical rail at the left edge of the work area
 * (spec §01A). Always present (never hidden), so it's the way back when panes are
 * hidden. Visual look only; semantics live in PaneToggleStrip.tsx.
 */
.strip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  flex: 0 0 auto;
  padding: var(--space-3) var(--space-2);
  border-right: var(--border-width) solid var(--border);
  background: var(--layer-01);
}

.button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: var(--border-width) solid transparent;
  border-radius: var(--radius);
  background: transparent;
  /* Not-pressed (hidden pane) reads as muted; pressed (shown) lifts to full text. */
  color: var(--text-secondary);
  cursor: pointer;
  transition:
    background var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease);
}

.button:hover {
  background: var(--layer-02);
  color: var(--text);
}

.button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* Shown pane: the toggle is "on" — full-strength glyph on a filled chip. */
.pressed {
  color: var(--text);
  background: var(--layer-02);
  border-color: var(--border-strong);
}

.divider {
  width: 20px;
  height: var(--border-width);
  margin: var(--space-1) 0;
  background: var(--border);
}