/* fsq-layout-q13.css - Layout layer with container queries and subgrid */
@layer layout {
  /* Container */
  .fsq-container {
    width: 100%;
    max-width: var(--fsq-container-2xl);
    margin-inline: auto;
    padding-inline: var(--fsq-space-4);

    @media (min-width: 768px) {
      padding-inline: var(--fsq-space-6);
    }

    @media (min-width: 1024px) {
      padding-inline: var(--fsq-space-8);
    }
  }

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

  /* Section spacing */
  .fsq-section {
    padding-block: var(--fsq-space-12);

    @media (min-width: 768px) {
      padding-block: var(--fsq-space-16);
    }

    @media (min-width: 1024px) {
      padding-block: var(--fsq-space-24);
    }
  }

  /* Grid layouts */
  .fsq-grid {
    display: grid;
    gap: var(--fsq-space-6);

    &--2 {
      grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
    }

    &--3 {
      grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
    }

    &--4 {
      grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
    }
  }

  /* Flex layouts */
  .fsq-flex {
    display: flex;
    gap: var(--fsq-space-4);

    &--center {
      align-items: center;
      justify-content: center;
    }

    &--between {
      align-items: center;
      justify-content: space-between;
    }

    &--wrap {
      flex-wrap: wrap;
    }

    &--col {
      flex-direction: column;
    }
  }

  /* Stack layout */
  .fsq-stack {
    display: flex;
    flex-direction: column;
    gap: var(--fsq-space-4);
  }

  /* Cluster layout */
  .fsq-cluster {
    display: flex;
    flex-wrap: wrap;
    gap: var(--fsq-space-3);
    align-items: center;
  }

  /* Container query contexts */
  .fsq-card-container {
    container-type: inline-size;
    container-name: card;
  }

  /* Responsive card using container queries */
  @container card (min-width: 400px) {
    .fsq-card {
      display: grid;
      grid-template-columns: 1fr 2fr;
      gap: var(--fsq-space-4);
    }
  }

  /* Subgrid support */
  @supports (grid-template-rows: subgrid) {
    .fsq-grid--subgrid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: var(--fsq-space-6);

      & > * {
        display: grid;
        grid-template-rows: subgrid;
        grid-row: span 3;
      }
    }
  }

  /* Sticky header */
  .fsq-header {
    position: sticky;
    top: 0;
    z-index: var(--fsq-z-sticky);
    background: var(--fsq-color-surface);
    border-bottom: 1px solid var(--fsq-color-border);
    box-shadow: var(--fsq-shadow-sm);
  }

  /* Main content area */
  .fsq-main {
    min-height: calc(100vh - 200px);
  }

  /* Footer */
  .fsq-footer {
    background: var(--fsq-color-neutral-900);
    color: var(--fsq-color-neutral-100);
    padding-block: var(--fsq-space-12);
  }

  /* Aspect ratio boxes */
  .fsq-aspect {
    position: relative;

    &::before {
      content: "";
      display: block;
      padding-bottom: var(--aspect-ratio, 100%);
    }

    & > * {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
  }

  .fsq-aspect--16-9 {
    --aspect-ratio: 56.25%;
  }

  .fsq-aspect--4-3 {
    --aspect-ratio: 75%;
  }

  .fsq-aspect--square {
    --aspect-ratio: 100%;
  }

  /* Visually hidden */
  .fsq-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
  }
}