.pane {
  position: fixed;
  inset: 0;
  z-index: 100;
  visibility: hidden;
}

.pane-backdrop {
  position: absolute;
  inset: 0;
  background-color: var(--color-backdrop);
  opacity: 0;
  transition: opacity 300ms ease;
  pointer-events: auto;
}

.pane-panel {
  position: absolute;
  top: 0;
  right: 0;
  display: flex;
  flex-direction: column;
  width: 92%;
  max-width: 100%;
  height: 100%;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-pane);
  transform: translateX(100%);
  transition: transform 300ms ease;
  pointer-events: auto;
}

.pane.is-open {
  visibility: visible;
}

.pane-backdrop.is-open {
  opacity: 1;
}

.pane-panel.is-open {
  transform: translateX(0);
}

@media (min-width: 768px) {
  .pane-panel {
    width: var(--pane-width-desktop);
  }
}

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.pane-title {
  margin: 0;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.pane-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  font-size: 1.25rem;
  line-height: 1;
  color: var(--color-text-muted);
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.pane-close:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.pane-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6) var(--space-5);
}

.pane-stub {
  margin: 0;
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
}

@media (prefers-reduced-motion: reduce) {
  .pane-backdrop,
  .pane-panel {
    transition: none;
  }
}