@media (max-width: 700px) {
  body.mobile-reference-preview-open {
    overflow: hidden;
  }

  /*
   * site.css gives main a z-index, which creates a stacking context beneath the
   * body-level backdrop. Release that stacking context while the sheet is open
   * so the fixed preview can sit above the backdrop and receive touch input.
   */
  body.mobile-reference-preview-open .reference-main {
    z-index: auto;
  }

  .reference-row {
    min-height: 4.25rem;
  }

  .reference-preview {
    position: fixed;
    z-index: 1001;
    top: auto;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    max-height: calc(100vh - 1rem);
    max-height: min(82dvh, 46rem);
    min-height: 0;
    margin: 0;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior-y: contain;
    touch-action: pan-y;
    -webkit-overflow-scrolling: touch;
    scrollbar-gutter: stable;
    isolation: isolate;
    border: 1px solid var(--line);
    border-right: 0;
    border-bottom: 0;
    border-left: 0;
    border-radius: 18px 18px 0 0;
    padding: 1.25rem 1.25rem calc(1.5rem + env(safe-area-inset-bottom));
    background: #f7f1e5;
    box-shadow: 0 -18px 44px rgba(36, 27, 22, 0.24);
    transform: translateY(calc(100% + 1rem));
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    transition: transform 180ms ease, opacity 180ms ease, visibility 0s linear 180ms;
  }

  .reference-preview.mobile-open {
    transform: translateY(0);
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transition: transform 180ms ease, opacity 180ms ease;
  }

  .mobile-reference-preview-close {
    position: sticky;
    z-index: 2;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    min-width: 2.75rem;
    margin: 0 0 -2.75rem auto;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: #fffaf0;
    color: var(--ink);
    padding: 0;
    box-shadow: 0 4px 14px rgba(36, 27, 22, 0.14);
    font-size: 1.6rem;
    font-weight: 500;
    line-height: 1;
  }

  .mobile-reference-preview-close:hover {
    background: #f8eee1;
  }

  .mobile-reference-preview-backdrop {
    position: fixed;
    z-index: 1000;
    inset: 0;
    background: rgba(24, 18, 14, 0.5);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 180ms ease, visibility 0s linear 180ms;
  }

  .mobile-reference-preview-backdrop.mobile-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: opacity 180ms ease;
  }
}

@media (min-width: 701px) {
  .mobile-reference-preview-close,
  .mobile-reference-preview-backdrop {
    display: none !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reference-preview,
  .mobile-reference-preview-backdrop {
    transition: none !important;
  }
}