/*
 * Page shell and spacing primitives.
 *
 * Everything here is class-based so it cannot disturb the markup Active Admin
 * generates. The primitives at the bottom own vertical rhythm, which keeps the
 * component layer free of one-off margins.
 */

@layer layout {
  .page-header {
    background-color: var(--surface-raised);
    border-bottom: 1px solid var(--border-subtle);
  }

  .page-header__inner,
  .page-main {
    max-width: var(--container);
    margin-inline: auto;
    padding-inline: var(--space-5);
  }

  .page-header__inner {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3) var(--space-5);
    align-items: baseline;
    justify-content: space-between;
    padding-block: var(--space-4);
  }

  .page-main {
    padding-block: var(--space-6) var(--space-7);
  }

  .page-brand {
    font-size: var(--text-lg);
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    text-decoration: none;
  }

  .page-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .page-nav a {
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    font-weight: 500;
    text-decoration: none;
  }

  .page-nav a:hover {
    background-color: var(--accent-wash);
  }

  .page-nav a[aria-current="page"] {
    background-color: var(--accent-wash);
    color: var(--accent-strong);
  }

  /* Owns the vertical gap between blocks, so children need no margins. */
  .stack {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
  }

  .stack--tight {
    gap: var(--space-3);
  }

  .stack > * {
    margin-block: 0;
  }

  /* Wraps onto multiple lines instead of overflowing on narrow screens. */
  .cluster {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    align-items: center;
  }

  .cluster--between {
    justify-content: space-between;
  }

  /* Auto-fitting grid: no breakpoints to keep in sync. */
  .grid-auto {
    display: grid;
    gap: var(--space-4);
    grid-template-columns: repeat(auto-fit, minmax(min(20rem, 100%), 1fr));
  }

  /* Wide tables scroll on their own rather than the page scrolling sideways. */
  .table-scroll {
    overflow-x: auto;
  }

  .visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }
}