:root {
  --shelf-intro-bottom: 40px;
  --shelf-detail-gap: 32px;
  --shelf-package-gap: 18px;
  --shelf-package-padding: 24px;
  --shelf-button-height: 54px;
  --shelf-note-size: 12px;
  --shelf-dot-field: radial-gradient(circle, color-mix(in srgb, var(--text-muted) 24%, var(--transparent)) 1px, var(--transparent) 1.5px);
  --shelf-dot-mask: radial-gradient(ellipse at 90% 38%, var(--ink-mask), var(--transparent) 67%);
}
.shelf-intro {
  position: relative;
  isolation: isolate;
  overflow: clip;
  padding-bottom: var(--shelf-intro-bottom);
}
.shelf-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: var(--shelf-dot-field);
  background-size: 22px 22px;
  background-color: var(--transparent);
  color: var(--text);
  mask-image: var(--shelf-dot-mask);
}
.shelf-intro .lede {
  max-width: var(--reading);
}
.shelf-intro__note {
  max-width: var(--reading);
  margin-top: 24px;
  margin-bottom: 0;
}
.shelf-content {
  min-width: 0;
}
.shelf-heading {
  margin-top: var(--shelf-detail-gap);
  margin-bottom: 24px;
}
.shelf-heading h2 {
  margin-bottom: 12px;
}
.shelf-heading p {
  margin-bottom: 0;
}
.package-options {
  gap: var(--shelf-package-gap);
}
.package-option {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: var(--shelf-package-padding);
  border: 1px solid var(--border);
  border-radius: var(--radius-ctl);
  background: var(--bg);
  color: var(--text);
}
.package-option > .small {
  flex-grow: 1;
}
.package-option__download {
  width: 100%;
  min-height: var(--shelf-button-height);
  overflow-wrap: anywhere;
}
.package-option__format {
  margin-top: 12px;
  margin-bottom: 0;
  font-size: var(--shelf-note-size);
  color: var(--text-muted);
}
.package-option__alternate {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  min-height: 44px;
  margin-top: 8px;
}
.shelf-notes {
  margin-top: var(--shelf-detail-gap);
}
.shelf-requirements {
  margin-top: var(--shelf-detail-gap);
}
.shelf-requirements > p {
  margin-top: 16px;
  margin-bottom: 0;
}
.shelf-checklist {
  align-self: start;
}
.shelf-checklist ol {
  margin-top: 0;
  margin-bottom: 24px;
}
.shelf-checklist li {
  margin-bottom: 16px;
  color: var(--text-muted);
}
.shelf-checklist strong {
  color: var(--text);
  font-weight: var(--weight-semibold);
}
.shelf-reading {
  align-self: start;
}
.shelf-reading li {
  margin-bottom: 12px;
}
.shelf-reading h3,
.shelf-checklist h3,
.shelf-intro + .shelf-content h2,
#prepare-title,
#selection-title {
  margin-top: 0;
}
@media (max-width: 640px) {
  :root {
    --shelf-intro-bottom: 28px;
    --shelf-detail-gap: 24px;
    --shelf-package-padding: 16px;
  }
  .shelf-content [role="tab"] {
    padding-inline: 12px;
  }
}