/* =========================================================
   shapes-panel-header.css
   Responsibility: ShapesPanelHeader layout — title text
   and the open/close toggle button visual states.
   Phase Coverage: 1.1
   ========================================================= */

#ShapesPanelHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px 0 14px;
  height: var(--panel-header-height);
  background: linear-gradient(180deg, #1a1f2e 0%, #13161f 100%);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  box-shadow: var(--shadow-inset);
}

/* ── Panel Title ─────────────────────────────────────────── */
#ShapesPanelTitle {
  font-size: 10px;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 1.4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: opacity var(--t-normal);
  user-select: none;
}

/* Title hides when panel collapses */
#ShapesPanel.collapsed #ShapesPanelTitle {
  opacity: 0;
  width: 0;
}

/* ── Toggle Button ───────────────────────────────────────── */
#ShapesPanelToggleButton {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  color: var(--color-text-muted);
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast), box-shadow var(--t-fast);
  outline: none;
}

#ShapesPanelToggleButton:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-light);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
}

#ShapesPanelToggleButton:focus-visible {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent-glow-md);
}

/* Arrow icon rotates when collapsed */
.toggle-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--t-slow);
  will-change: transform;
}

/* When collapsed, point arrow to the right (→) */
#ShapesPanel.collapsed .toggle-icon {
  transform: rotate(180deg);
}