.sidebar-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  gap: 12px;
  min-height: 44px;
  padding-bottom: 18px;
  border-bottom: 1px solid #ffffff12;
}
button.sidebar-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1.5px solid #334155;
  border-radius: 11px;
  background: #1e293b;
  color: #cbd5e1;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}
button.sidebar-toggle:hover { background: #29374b; border-color: #64748b; color: #f1f5f9; }
button.sidebar-toggle:focus-visible { outline: 3px solid #bfdbfe; outline-offset: 3px; }
.sidebar-toggle svg { display: block; width: 24px; height: 24px; flex-shrink: 0; }
.sidebar-toggle-direction { transform-box: fill-box; transform-origin: center; transition: transform 180ms ease; }
.sidebar-toggle[aria-expanded="false"] .sidebar-toggle-direction { transform: rotate(180deg); }
@media (prefers-reduced-motion: reduce) {
  button.sidebar-toggle, .sidebar-toggle-direction { transition: none; }
}