/*
 * Layout styles.
 * Page structure, containers, grid systems.
 */
@layer base {
  /* Page structure - header, main, footer grid */
  body {
    display: grid;
    grid-template-rows: auto 1fr auto;
    min-block-size: 100dvh;
    margin: 0;
  }

  /* Main content container */
  main {
    margin-inline: auto;
    max-inline-size: var(--content-max-width);
    padding-block: var(--space-2xl);
    padding-inline: var(--content-padding);
    inline-size: 100%;
  }

  /* Narrow content (for reading) */
  .content-narrow {
    max-inline-size: var(--content-narrow);
    margin-inline: auto;
  }

  /* Wide content (for dashboards) */
  .content-wide {
    max-inline-size: var(--content-wide);
  }

  /* Full-bleed content (edge to edge) */
  .content-full {
    max-inline-size: none;
    padding-inline: 0;
  }

  /* Header */
  header {
    position: sticky;
    inset-block-start: 0;
    z-index: var(--z-sticky);
    background: var(--color-nav-bg);
    border-block-end: var(--border-width) solid var(--color-border);
  }

  /* Header inner container */
  header > .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
    max-inline-size: var(--content-max-width);
    margin-inline: auto;
    padding-block: var(--space-md);
    padding-inline: var(--content-padding);
    min-block-size: var(--header-height);
  }

  /* Footer */
  footer {
    background: var(--color-background-elevated);
    border-block-start: var(--border-width) solid var(--color-border);
    padding-block: var(--space-xl);
    padding-inline: var(--content-padding);
  }

  footer > .container {
    max-inline-size: var(--content-max-width);
    margin-inline: auto;
  }

  /* Common layout patterns */

  /* Stack - vertical spacing between children */
  .stack {
    display: flex;
    flex-direction: column;
  }

  .stack > * + * {
    margin-block-start: var(--space-md);
  }

  .stack-sm > * + * {
    margin-block-start: var(--space-sm);
  }

  .stack-lg > * + * {
    margin-block-start: var(--space-lg);
  }

  .stack-xl > * + * {
    margin-block-start: var(--space-xl);
  }

  /* Cluster - horizontal items with wrapping */
  .cluster {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    align-items: center;
  }

  .cluster-lg {
    gap: var(--space-lg);
  }

  /* Sidebar layout - main content with sidebar */
  .sidebar-layout {
    display: grid;
    gap: var(--space-lg);
  }

  @media (min-width: 768px) {
    .sidebar-layout {
      grid-template-columns: 250px 1fr;
    }

    .sidebar-layout.sidebar-right {
      grid-template-columns: 1fr 250px;
    }
  }

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

  .grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));
  }

  .grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
  }

  .grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
  }

  /* Center - horizontally and vertically centered content */
  .center {
    display: grid;
    place-items: center;
    min-block-size: 50vh;
  }

  /* Switcher - switches from horizontal to vertical at a breakpoint */
  .switcher {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
  }

  .switcher > * {
    flex-grow: 1;
    flex-basis: calc((40rem - 100%) * 999);
  }

  /* Cover - vertically centered content with header/footer */
  .cover {
    display: flex;
    flex-direction: column;
    min-block-size: 100dvh;
    padding: var(--space-lg);
  }

  .cover > * {
    margin-block: var(--space-md);
  }

  .cover > :first-child:not(.cover-center) {
    margin-block-start: 0;
  }

  .cover > :last-child:not(.cover-center) {
    margin-block-end: 0;
  }

  .cover > .cover-center {
    margin-block: auto;
  }

  /* Container utility */
  .container {
    max-inline-size: var(--content-max-width);
    margin-inline: auto;
    padding-inline: var(--content-padding);
  }

  .container-narrow {
    max-inline-size: var(--content-narrow);
  }

  .container-wide {
    max-inline-size: var(--content-wide);
  }
}