@layer layout {
  body {
    display: flex;
    flex-direction: column;
  }

  main {
    flex: 1;
  }

  .container {
    width: min(100% - 2 * var(--gutter), var(--container-max));
    margin-inline: auto;
  }

  .container--narrow {
    max-width: var(--container-narrow);
  }

  .section {
    padding-block: var(--space-2xl);
  }

  /* Vertical rhythm between direct children */
  .stack > * + * {
    margin-block-start: var(--stack-space, var(--space-s));
  }

  .cluster {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--cluster-space, var(--space-s));
  }

  /* Responsive grid without media queries */
  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(var(--grid-min, 16rem), 100%), 1fr));
    gap: var(--grid-gap, var(--space-m));
  }

  .site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
  }

  .site-header__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-s);
    min-height: var(--header-height);
  }

  .site-footer {
    padding-block: var(--space-l);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
  }
}