@media (max-width: 768px) {
  .page-shell,
  .page-shell--wide,
  .page-shell--reader,
  .page-masthead,
  .page-masthead--wide,
  .page-masthead--reader,
  .site-footer,
  .site-footer--wide,
  .site-footer--reader,
  .site-footer--cover {
    width: min(calc(100% - 1.5rem), var(--kb-reader-width));
  }

  .page-shell,
  .page-shell--wide,
  .page-shell--reader {
    padding-bottom: 2.25rem;
  }

  .catalog-section {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }

  .cover-card {
    min-height: auto;
    padding: 1.5rem;
  }

  .cover-tools {
    justify-content: flex-end;
  }

  .masthead-nav {
    gap: 0.8rem;
    width: 100%;
  }

  .masthead-nav-links,
  .masthead-actions,
  .cover-tools {
    gap: 0.65rem;
  }

  .masthead-actions {
    flex: 1;
    justify-content: flex-end;
  }

  .masthead-nav-links {
    display: none;
  }

  .menu-drawer {
    display: block;
  }

  .menu-drawer-panel {
    width: min(11.75rem, calc(100vw - 0.75rem));
    padding: 1rem;
  }

  .account-menu-label {
    max-width: 5.5rem;
  }

  .cover-copy {
    padding: 1.25rem 0 1.75rem;
  }

  .site-mark-logo {
    max-width: 6.25rem;
    height: 1.35rem;
  }

  .cover-entry {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .cover-entry-button {
    width: 100%;
  }

  .cover-index {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.65rem;
  }

  .cover-index-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.65rem;
    padding: 0 0.65rem;
    border: 1px solid var(--kb-color-border);
    border-radius: var(--kb-radius-control);
    background: var(--kb-color-control-bg);
    text-align: center;
  }

  .cover-index-link:last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }

  .cover-index-link::after {
    display: none;
  }

  .catalog-link {
    grid-template-columns: 1fr;
    gap: 0.3rem;
    align-items: flex-start;
  }

  .taxonomy-link,
  .tag-chip {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .tag-cloud {
    grid-template-columns: 1fr;
  }

  .footer-block {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-meta {
    align-items: flex-start;
    text-align: left;
  }

  .link-card-list {
    grid-template-columns: 1fr;
  }

  .photo-wall {
    column-count: 2;
  }

  .moment-media {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tag-chip:nth-child(-n + 2) {
    border-top: 1px solid var(--kb-color-border);
  }

  .tag-chip:first-child {
    border-top: 0;
  }

  .pager {
    grid-template-columns: 1fr;
    grid-template-areas:
      "center"
      "prev"
      "next";
    align-items: stretch;
    gap: 0.85rem;
  }

  .pager-slot,
  .pager-slot--next {
    width: 100%;
    justify-content: stretch;
  }

  .pager-center {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    min-width: 0;
    justify-self: stretch;
    justify-content: flex-start;
    gap: 0.75rem;
    padding: 0.95rem 1rem;
  }

  .pager-center--numbered {
    min-width: 0;
  }

  .pager-current {
    text-align: center;
  }

  .pager-slot .pager-link {
    width: 100%;
    justify-content: center;
  }

  .post-layout {
    grid-template-columns: minmax(0, 14rem) minmax(0, 1fr);
    gap: 1.35rem;
  }

  .post-sidebar {
    top: 1rem;
  }

  .post-outline-body {
    max-height: calc(100vh - 7rem);
  }

  .chapter-link {
    gap: 0.35rem;
  }

  .chapter-heading {
    grid-template-columns: 1fr;
    align-items: flex-start;
  }

  .post-navigation {
    grid-template-columns: 1fr;
    gap: 0.7rem;
  }

  .post-navigation-link--next {
    text-align: left;
  }

  .post-meta-item {
    width: 100%;
    justify-content: space-between;
  }

  .post-navigation-link,
  .post-navigation-spacer {
    min-height: 4rem;
  }

  .post-navigation-spacer {
    display: none;
  }

  .quick-return {
    right: 0.75rem;
    left: 0.75rem;
    bottom: 0.75rem;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    justify-content: stretch;
  }

  .quick-return-link {
    width: 100%;
    min-width: 0;
    padding: 0 0.65rem;
  }

  .theme-switch {
    inline-size: 8.1rem;
  }

  .theme-switch--compact {
    inline-size: 2.9rem;
    flex-basis: 2.9rem;
  }

  .image-lightbox {
    padding: 1rem;
  }

  .image-lightbox-close {
    top: 0.75rem;
    right: 0.75rem;
  }
}

@media (max-width: 680px) {
  .post-layout {
    grid-template-columns: 1fr;
    grid-template-areas:
      "article";
    gap: 0;
  }

  .post-layout > .post-article {
    position: static;
  }

  .post-sidebar {
    display: none;
  }

  .post-mobile-outline-bar {
    position: sticky;
    top: 0.75rem;
    z-index: 36;
    display: block;
    margin-bottom: 1rem;
    pointer-events: auto;
  }

  .post-mobile-outline-toggle {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 0.75rem;
    align-items: center;
    width: 100%;
    min-height: 3rem;
    padding: 0.8rem 1rem;
    border: 1px solid var(--kb-color-border);
    border-radius: var(--kb-radius-panel);
    background: var(--kb-color-surface-strong);
    box-shadow: var(--kb-shadow);
    color: var(--kb-color-text);
    font: inherit;
    text-align: left;
    backdrop-filter: blur(10px);
    pointer-events: auto;
    transition:
      border-color var(--kb-motion-fast),
      background-color var(--kb-motion-fast),
      transform var(--kb-motion-fast);
  }

  .post-mobile-outline-toggle:active {
    transform: translateY(1px);
  }

  .post-mobile-outline-label {
    color: var(--kb-color-muted);
    font-size: 0.8rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
  }

  .post-mobile-outline-current {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.92rem;
  }

  .post-mobile-outline-indicator {
    color: var(--kb-color-muted);
    font-size: 0.88rem;
  }

  .post-mobile-outline-toggle[aria-expanded="true"] .post-mobile-outline-indicator {
    color: var(--kb-color-text);
  }

  .post-outline-head {
    display: none;
  }

  .post-outline {
    width: 100%;
    max-height: 0;
    margin: 0;
    padding-top: 0;
    padding-bottom: 0;
    border-width: 0;
    box-shadow: none;
    transform: translateY(-0.3rem);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    overflow: hidden;
    animation: none;
    transition:
      max-height var(--kb-motion-collapse),
      margin-top var(--kb-motion-collapse),
      padding-top var(--kb-motion-collapse),
      padding-bottom var(--kb-motion-collapse),
      border-width var(--kb-motion-collapse),
      box-shadow var(--kb-motion-collapse),
      transform var(--kb-motion-collapse),
      opacity 220ms ease,
      visibility var(--kb-motion-fast);
  }

  .post-outline.is-open {
    max-height: min(70vh, 32rem);
    margin-top: 0.8rem;
    padding-top: 1rem;
    padding-bottom: 1rem;
    border-width: 1px;
    box-shadow: var(--kb-shadow);
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .post-outline-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.2rem;
    padding: 0 0.8rem;
    border: 1px solid var(--kb-color-border);
    border-radius: var(--kb-radius-control);
    background: var(--kb-color-control-bg);
    color: var(--kb-color-muted);
    font: inherit;
    pointer-events: auto;
  }

  .post-outline-body {
    margin-top: 0;
    max-height: calc(min(70vh, 32rem) - 2rem);
    padding-right: 0.15rem;
  }
}

@media (max-width: 480px) {
  .photo-wall {
    column-count: 1;
  }

  .moment-media {
    grid-template-columns: 1fr;
  }

  .pager-pages {
    gap: 0.35rem;
  }

  .pager-page,
  .pager-ellipsis {
    min-width: 2.15rem;
    min-height: 2.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto;
    transition-duration: 0ms !important;
  }
}