[data-fui-comp="ui-step-rail"] {
  position: sticky;
  inset-block-start: var(--ui-step-rail-top, var(--spacing-xl, 32px));
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md, 16px);
  padding: var(--spacing-md, 16px);
  border: 1px solid var(--color-border, rgba(0,0,0,0.1));
  border-radius: var(--radius-md, 8px);
  background: var(--color-surface-soft, transparent);
}
[data-fui-comp="ui-step-rail"] .ui-step-rail__title {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-subtle, currentColor);
}
[data-fui-comp="ui-step-rail"] .ui-step-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
[data-fui-comp="ui-step-rail"] .ui-step-rail__link {
  display: grid;
  grid-template-columns: 32px 1fr;
  align-items: center;
  gap: var(--spacing-xs, 4px);
  padding: var(--spacing-xs, 4px) var(--spacing-sm, 8px);
  color: var(--color-text-subtle, currentColor);
  text-decoration: none;
  border-radius: var(--radius-sm, 6px);
}
[data-fui-comp="ui-step-rail"] .ui-step-rail__link:hover,
[data-fui-comp="ui-step-rail"] .ui-step-rail__link:focus-visible {
  background: var(--color-surface-soft, rgba(0,0,0,0.04));
  color: var(--color-text, currentColor);
}
[data-fui-comp="ui-step-rail"] .ui-step-rail__link--active {
  color: var(--color-text, currentColor);
}
[data-fui-comp="ui-step-rail"] .ui-step-rail__num {
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, monospace);
  font-size: 11px;
  color: var(--color-text-subtle, currentColor);
  font-variant-numeric: tabular-nums;
}
[data-fui-comp="ui-step-rail"] .ui-step-rail__link--active .ui-step-rail__num {
  color: var(--ui-step-rail-active-color, var(--color-primary, currentColor));
}
[data-fui-comp="ui-step-rail"] .ui-step-rail__meta {
  font-size: 11px;
  color: var(--color-text-subtle, currentColor);
  line-height: 1.5;
  /* Long URLs in the meta line must wrap rather than overrun the
     rail's narrow column. The arbitrary break is acceptable because
     the meta line is supplemental copy, not a navigation target. */
  overflow-wrap: anywhere;
  word-break: break-word;
}

/* On phones the rail can't be sticky next to body content because
   the body collapses to a single column. We drop the sticky pin so
   the rail flows inline. Hosts that want it hidden behind a
   disclosure can override .ui-step-rail with display: none in their
   mobile breakpoint. */
@media (max-width: 720px) {
  [data-fui-comp="ui-step-rail"] {
    position: static;
  }
}