/* FRAME library: index cards, work pages and the chapter reader.
   Uses the site's colour tokens so light and dark themes both work. */

.lib-index { padding-top: 1.25rem; padding-bottom: 3rem; }
.lib-group h2 { margin: 1.5rem 0 0.9rem; }
.lib-group:first-child h2 { margin-top: 0; }
.lib-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr)); }
.lib-card a { position: relative; display: flex; flex-direction: column; gap: 0.3rem; height: 100%; padding: 0 0 1rem; text-decoration: none; color: inherit; background: var(--paper-2); border: 1px solid var(--rule); border-left: 3px solid var(--accent); border-radius: var(--radius); }
.lib-card a:hover, .lib-card a:focus-visible { border-color: var(--accent); }
.lib-kind { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.lib-title { font-weight: 700; font-size: 1.15rem; line-height: 1.25; }
.lib-author { color: var(--ink-2); font-size: 0.95rem; }
.lib-meta { color: var(--muted); font-size: 0.8rem; margin-top: auto; padding-top: 0.5rem; }
.lib-how { margin-top: 3rem; border-top: 1px solid var(--rule); padding-top: 1rem; }

/* Work page */
.lib-contents { list-style: none; margin: 0 0 1.5rem; padding: 0; }
.lib-contents li { margin: 0.35rem 0; }
.lib-contents .lib-part, .lib-rail .lib-part { list-style: none; margin: 1rem 0 0.25rem 0; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.lib-download { margin: 0 0 1.5rem; display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center; }
.lib-prov { margin-top: 0.5rem; }
.lib-prov code { font-size: 0.85em; }

/* Reader */
.lib-page { max-width: 44rem; }
.lib-text { font-size: 1.1rem; line-height: 1.75; }
.lib-text p { margin: 0 0 1.15em; }
.lib-text blockquote { margin: 0 0 1.15em; padding-left: 1.1rem; border-left: 2px solid var(--rule); color: var(--ink-2); }
.lib-text blockquote p { margin: 0; }
.lib-text .lib-lines { white-space: pre-wrap; font-family: var(--mono); font-size: 0.92rem; line-height: 1.55; overflow-x: auto; }
.lib-text .lib-num { text-align: center; color: var(--muted); font-family: var(--mono); margin: 1.6em 0 0.8em; }
.lib-text .lib-sub { font-family: var(--mono); font-size: 0.85rem; letter-spacing: 0.06em; margin: 1.6em 0 0.6em; }
.lib-pager { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.9rem; margin: 0 0 1.5rem; }
.lib-pager a { max-width: 48%; }
.lib-pager a[rel="next"] { margin-left: auto; text-align: right; }
.lib-pager-bottom { margin: 2rem 0 1rem; padding-top: 1rem; border-top: 1px solid var(--rule); }
.lib-foot { font-size: 0.85rem; }
.lib-rail ol { list-style: none; margin: 0; padding: 0; max-height: 60vh; overflow-y: auto; }
.lib-rail li { margin: 0.25rem 0; font-size: 0.9rem; }
.lib-rail a[aria-current] { color: var(--ink); font-weight: 700; }

@media (max-width: 40rem) {
  .lib-text { font-size: 1.05rem; }
  .lib-pager { flex-direction: column; }
  .lib-pager a { max-width: none; }
  .lib-pager a[rel="next"] { margin-left: 0; text-align: left; }
}

/* Card thumbnails */
.lib-thumb { position: relative; display: block; margin: 0 0 0.5rem; background: var(--mount); }
.lib-fig { margin: 0 0 1rem; }
.lib-fig img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; border: 1px solid var(--rule); border-radius: var(--radius); }
.lib-fig figcaption { margin-top: 0.4rem; font-size: 0.78rem; line-height: 1.4; color: var(--muted); }
.lib-thumb img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; }
.lib-illus { position: absolute; right: 0.4rem; bottom: 0.4rem; padding: 0.1rem 0.4rem; background: rgba(0, 0, 0, 0.62); color: #f7f5f0; font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.08em; text-transform: uppercase; }
.lib-card a > span:not(.lib-thumb) { padding: 0 1.1rem; }
.lib-how { max-width: calc(var(--measure) + 2.5rem); }
@media (min-width: 62rem) {
  .lib-how { max-width: none; column-count: 2; column-gap: 3rem; }
  .lib-how > h2 { break-after: avoid; margin-top: 0; }
  .lib-how > h2 ~ h2 { margin-top: 1.5rem; }
}