/**
 * Prime League case study: the before/after navigation diagram.
 * Everything else uses site.css, like the other case studies.
 */
.ia__grid {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: var(--space-24);
}
.ia__side {
  display: flex; flex-direction: column; gap: var(--space-12); padding: var(--space-24);
  background: var(--color-bg-subtle); border: var(--border-width-default) solid var(--color-border-default); border-radius: var(--radius-container);
}
.ia__side--after { background: var(--color-bg-default); border-color: var(--color-action-primary-bg-default); }
.ia__tag { margin: 0 !important; color: var(--color-fg-muted); }
.ia__side--after .ia__tag { color: var(--button-ghost-fg); }

/* before: a long chain, the match at the very end */
.ia__chain { list-style: none; margin: 0 !important; padding: 0 !important; display: flex; flex-direction: column; align-items: flex-start; }
.ia__chain li {
  position: relative; margin: 0 0 22px !important; padding: 6px 12px; border-radius: var(--radius-control);
  background: var(--color-bg-default); border: var(--border-width-default) solid var(--color-border-strong);
  font-size: var(--font-size-200); line-height: var(--font-line-height-200); color: var(--color-fg-muted);
}
.ia__chain li:not(:last-child)::after {
  content: ""; position: absolute; left: 20px; top: 100%; width: 2px; height: 22px; background: var(--color-border-strong);
}
.ia__chain li:nth-child(2) { margin-left: 16px !important; }
.ia__chain li:nth-child(3) { margin-left: 32px !important; }
.ia__chain li:nth-child(4) { margin-left: 48px !important; }
.ia__chain li:nth-child(5) { margin-left: 64px !important; }
.ia__chain li:nth-child(6) { margin-left: 80px !important; }
.ia__chain li:last-child { margin-bottom: 0 !important; }
.ia__goal { color: var(--color-fg-default) !important; font-weight: var(--font-weight-medium); border-style: dashed !important; }

/* after: three entry points, one step from the start page */
.ia__start {
  align-self: flex-start; padding: 6px 12px; border-radius: var(--radius-control);
  background: var(--color-action-ghost-bg-hover); border: var(--border-width-default) solid var(--color-action-primary-bg-default);
  font-size: var(--font-size-200); font-weight: var(--font-weight-medium); color: var(--color-fg-default);
}
.ia__entries {
  list-style: none; margin: 0 !important; padding: var(--space-16) 0 0 !important; position: relative;
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-12);
}
.ia__entries::before {   /* one short line from the start page down to the three entries */
  content: ""; position: absolute; left: 20px; top: 0; width: 2px; height: var(--space-16); background: var(--color-action-primary-bg-default);
}
.ia__entries li {
  margin: 0 !important; display: flex; flex-direction: column; gap: 4px; padding: var(--space-12);
  border-radius: var(--radius-control); border: var(--border-width-focus) solid var(--color-action-primary-bg-default); background: var(--color-bg-default);
}
.ia__entries b { font-weight: var(--font-weight-medium); color: var(--color-fg-default); }
.ia__entries span { font-size: var(--font-size-100); line-height: var(--font-line-height-100); color: var(--color-fg-muted); }
.ia__filter {
  margin: var(--space-8) 0 0 !important; padding: 6px 12px; align-self: flex-start; border-radius: var(--radius-pill);
  background: var(--color-bg-muted); font-size: var(--font-size-100); color: var(--color-fg-muted);
}
@media (max-width: 720px) {
  .ia__grid { grid-template-columns: minmax(0, 1fr); }
  .ia__entries { grid-template-columns: minmax(0, 1fr); }
}