/* library.css — Library + Bibliography page components, plus the
   epistemic-filter UI that now lives on /search.html. */

/* ============================================================
   FILTER UI
   Originally the Library's sort+filter panel; the sort panel
   and numeric filter were dropped in Phase 4 when the Library
   unified onto item-cards. The filter panel itself remains in
   use on /search.html, which reuses the same classes and
   filter-panel markup.
   ============================================================ */

.library-filter-toggle {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--text-muted);
    background: none;
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 0.15em 0.55em;
    cursor: pointer;
    margin-left: auto;
    transition: border-color 0.1s, color 0.1s;
}

.library-filter-toggle:hover,
.library-filter-toggle[aria-expanded="true"] {
    border-color: var(--text-muted);
    color: var(--text);
}

.filter-toggle-badge {
    font-weight: 600;
}

.library-filters {
    border-top: 1px solid var(--border);
    padding-top: 0.75rem;
    margin-top: 0.75rem;
}

.library-filters[hidden] {
    display: none;
}

.filter-row {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    margin-bottom: 0.45rem;
}

.filter-label {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    color: var(--text-faint);
    width: 5.5rem;
    flex-shrink: 0;
}

.filter-options {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.25rem;
}

.filter-prefix {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    color: var(--text-faint);
}

.filter-btn {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    color: var(--text-muted);
    background: none;
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 0.1em 0.45em;
    cursor: pointer;
    transition: border-color 0.1s, color 0.1s;
}

.filter-btn:hover {
    border-color: var(--border-muted);
    color: var(--text);
}

.filter-btn.is-active {
    border-color: var(--text-muted);
    color: var(--text);
    font-weight: 600;
}

.filter-number {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    width: 3rem;
    padding: 0.1em 0.3em;
    border: 1px solid var(--border);
    border-radius: 2px;
    background: transparent;
    color: var(--text);
}

.filter-number:focus {
    outline: none;
    border-color: var(--text-muted);
}

.filter-row-actions {
    justify-content: flex-end;
    margin-top: 0.25rem;
}

.filter-clear-btn {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    color: var(--text-faint);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.filter-clear-btn:hover {
    color: var(--text);
}

/* Search-page result filtering (applied via search-filters.js) */

.search-filtered {
    display: none !important;
}

/* Search page filter controls — just the toggle, no sort buttons */

.search-filter-controls {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 0.5rem;
}

/* ============================================================
   PORTAL SECTIONS
   Shared by the Library and by /bibliography/<keyword>/ pages
   for the Writings + References section headers.
   ============================================================ */

.library-section {
    margin-bottom: 2.5rem;
}

.library-section h2 {
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-variant: small-caps;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    text-transform: lowercase;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.library-section h2 a {
    color: inherit;
    text-decoration: none;
}

.library-section h2 a:hover {
    color: var(--text);
}

/* ============================================================
   SEE ALSO — compact chain (Phase 4)
   Secondary navigation above the portal sections: New,
   Commonplace, Colophon, Bibliography. Single-line `·`-separated
   list, sans-serif, muted, reads as a utility row rather than
   content.
   ============================================================ */

.library-see-also {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0.25rem 0 2rem;
}

.library-see-also a {
    color: var(--text-muted);
    text-decoration: underline;
    text-decoration-color: var(--border);
    text-decoration-thickness: 0.08em;
    text-underline-offset: 0.2em;
    transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

.library-see-also a:hover {
    color: var(--text);
    text-decoration-color: var(--border-muted);
}

.library-see-also-sep {
    color: var(--text-faint);
    padding: 0 0.35em;
    user-select: none;
}

/* ============================================================
   BIBLIOGRAPHY INDEX — alphabet jump strip + letter headers
   Complete A–Z row at top of /bibliography/ so the page reads
   as a scannable reference. Absent letters render as muted
   non-links so the strip stays visually complete without gaps.
   ============================================================ */

.bibliography-alphabet {
    display: flex;
    flex-wrap: wrap;
    gap: 0.15em;
    margin: 0.25rem 0 1.5rem;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    line-height: 1.4;
}

.bibliography-alphabet .alpha {
    display: inline-block;
    min-width: 1.2em;
    padding: 0.05em 0.2em;
    text-align: center;
    color: var(--text-muted);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

.bibliography-alphabet a.alpha:hover {
    color: var(--text);
    border-bottom-color: var(--border-muted);
}

.bibliography-alphabet .alpha-empty {
    color: var(--text-faint);
    opacity: 0.45;
    cursor: default;
}

.bibliography-letter {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-variant: small-caps;
    text-transform: lowercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    font-weight: 500;
    margin: 1.5rem 0 0.5rem;
    scroll-margin-top: 1rem;
}