@layer base {
  /* The shell: a fixed-width sidebar and the content column; stacks under 90ch. */
  .shell {
    display: flex;
    flex-wrap: wrap;
    min-height: 100dvh;
  }

  .shell__content {
    flex: 999 1 60ch;
    min-width: 0;
    display: flex;
    flex-direction: column;
  }

  .page {
    padding: var(--block-space-l) var(--block-space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--block-space-l);
    width: 100%;
    min-width: 0;

    @media (max-width: 90ch) { padding: var(--block-space) var(--block-space); }
  }

  .page__header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--block-space-l);
    flex-wrap: wrap;
  }

  .page__crumb {
    display: block;
    color: var(--color-ink-muted);
    font-size: var(--text-sm);
    font-weight: 500;
    margin-bottom: var(--block-space-s);
  }

  .page__actions { display: flex; gap: var(--inline-space); flex-wrap: wrap; }

  .columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(32ch, 1fr));
    gap: var(--block-space-l);
    align-items: start;
  }

  .stack { display: flex; flex-direction: column; gap: var(--block-space); }
  .cluster { display: flex; flex-wrap: wrap; gap: var(--inline-space); align-items: center; }
}