/* === Books section (/books/) ===
   Builds on main.css (dark theme, .page-header, .prose, .btn). */

.books-page a {
    color: var(--theme-color);
}
.books-page a.btn {
    color: #fff;
}
.books-page a:focus-visible,
.books-page button:focus-visible {
    outline: 2px solid var(--theme-color);
    outline-offset: 2px;
}
.books-page .page-header {
    display: block; /* main.css turns every <header> into a flex row */
}
.books-page .muted {
    color: rgba(255, 255, 255, 0.6);
}
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

/* --- Detail page: hero --- */
.book-hero-grid {
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 32px;
    align-items: start;
}
.book-cover {
    width: 100%;
    height: auto;
    border-radius: 6px;
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.6);
    background: #161616;
}
.book-hero-text h1 {
    margin: 0.1em 0 0.2em;
    font-size: 2.2em;
    line-height: 1.15;
    color: var(--theme-color);
}
.book-series {
    margin: 0;
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.6);
}
.book-series a {
    color: inherit;
    text-decoration: none;
}
.book-series a:hover {
    color: var(--theme-color);
}
.book-subtitle {
    margin: 0 0 0.75em;
    font-size: 1.15em;
    line-height: 1.4;
    color: rgba(255, 255, 255, 0.85);
}
.book-byline {
    margin: 0 0 1.25em;
    color: rgba(255, 255, 255, 0.7);
}
.book-buy {
    margin: 0 0 0.6em;
}
.book-note {
    margin: 0.25em 0 0;
    font-size: 0.8em;
    color: rgba(255, 255, 255, 0.5);
}
.book-editions {
    margin: 1.25em 0 0;
    padding-top: 1em;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.95em;
}

/* --- Detail page: description --- */
.books-page .prose > :first-child {
    margin-top: 0;
}
.book-description .lead {
    font-size: 1.2em;
    line-height: 1.5;
    color: #fff;
}
.book-description h3 {
    margin-bottom: 0.25em;
}
.book-description h3 + p {
    margin-top: 0;
}
.book-description blockquote {
    margin: 1.5em 0;
    padding: 0.25em 0 0.25em 1.25em;
    border-left: 3px solid var(--theme-color);
    font-style: italic;
}
.book-description .closing {
    font-size: 1.1em;
    font-weight: 600;
    color: #fff;
}
.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
    padding: 0 !important;
}
.tag-list li {
    padding: 2px 10px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    font-size: 0.9em;
}
.learn-box {
    background: rgba(var(--theme-color-rgb), 0.1);
    border: 1px solid rgba(var(--theme-color-rgb), 0.3);
}

/* --- Detail page: look inside (excerpt + contents) --- */
.look-inside details {
    margin: 12px 0;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    background: #161616;
}
.look-inside summary {
    padding: 12px 16px;
    cursor: pointer;
    font-weight: 600;
    color: #fff;
}
.look-inside summary:hover {
    color: var(--theme-color);
}
.look-inside details[open] summary {
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.excerpt-body,
.look-inside .toc {
    padding: 8px 24px 16px;
}
.excerpt-body {
    max-width: 42em;
    font-family: Georgia, "Times New Roman", serif;
    font-size: 1.05em;
}
.excerpt-body strong {
    color: #fff; /* book emphasis, not the orange accent of the page text */
}
.excerpt-body h3,
.excerpt-body h4 {
    font-family: Helvetica Neue, Helvetica, Arial, sans-serif;
}
.excerpt-body hr {
    border: none;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    margin: 1.5em 0;
}
.excerpt-body table {
    border-collapse: collapse;
    font-size: 0.9em;
    display: block;
    overflow-x: auto;
}
.excerpt-body th,
.excerpt-body td {
    padding: 4px 10px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    text-align: left;
}
.excerpt-more {
    font-style: italic;
    color: rgba(255, 255, 255, 0.6) !important;
}
.look-inside .toc {
    margin: 0;
    list-style: none;
}
.look-inside .toc li {
    margin: 0.2em 0 0.2em 1.2em;
}
.look-inside .toc .toc-part {
    margin: 1em 0 0.3em;
    font-weight: 600;
    color: #fff;
}

/* --- Detail page: articles, author --- */
.article-list ul {
    padding-left: 1.2em;
}
.article-list li {
    margin: 0.5em 0;
}
.author-box {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
}
.author-photo {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid #333;
}
.author-box h2 {
    margin-top: 0;
}
.author-links {
    font-size: 0.95em;
}

/* --- Detail page: series, related, details --- */
.series-nav ol,
.series-nav ul {
    padding-left: 1.2em;
}
.series-nav li {
    margin: 0.6em 0;
}
.series-nav .series-vol {
    display: inline-block;
    min-width: 4.5em;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9em;
}
.book-details dl {
    display: grid;
    grid-template-columns: max-content minmax(0, 1fr);
    gap: 6px 24px;
    margin: 0;
}
.book-details dt {
    color: rgba(255, 255, 255, 0.6);
}
.book-details dd {
    margin: 0;
    overflow-wrap: anywhere;
}
.back-link {
    margin: 24px 0;
}
.books-footer {
    margin-top: 48px;
}

/* --- Index: filter + table of contents --- */
.book-toc {
    margin: 1em 0 0;
    font-size: 0.95em;
}
.filter-bar {
    position: sticky;
    top: 0;
    z-index: 2;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin: 24px 0;
    padding: 12px 0;
    background: #000;
}
.filter-label {
    margin-right: 4px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9em;
}
.chip {
    padding: 6px 14px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 999px;
    background: transparent;
    color: #fff;
    font: inherit;
    font-size: 0.9em;
    cursor: pointer;
}
.chip:hover {
    border-color: var(--theme-color);
}
.chip[aria-pressed="true"] {
    background: var(--theme-color);
    border-color: var(--theme-color);
    color: #000;
    font-weight: 600;
}
.chip .count {
    opacity: 0.7;
    font-size: 0.85em;
}

/* --- Index: sections and cards --- */
.book-section {
    margin: 48px 0;
}
.book-section h2 {
    margin: 0 0 0.25em;
    font-size: 1.8em;
    color: var(--theme-color);
}
.book-section > .muted {
    margin: 0 0 20px;
}
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 440px), 1fr));
    gap: 20px;
}
.book-card {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 18px;
    padding: 16px;
    border-radius: 10px;
    background: #111;
    transition: background 0.15s ease;
}
.book-card:hover {
    background: #181818;
}
.book-card[hidden],
.book-section[hidden] {
    display: none;
}
.book-card-cover img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 4px;
}
.book-card h3 {
    margin: 0.15em 0 0.2em;
    font-size: 1.2em;
    line-height: 1.25;
}
.book-card-title {
    text-decoration: none;
}
.book-card-title:hover {
    text-decoration: underline;
}
.book-card-subtitle {
    margin: 0 0 0.6em;
    font-size: 0.9em;
    line-height: 1.4;
    color: rgba(255, 255, 255, 0.7);
}
.book-card-pitch {
    margin: 0 0 0.8em;
    font-size: 0.92em;
    line-height: 1.5;
    color: rgba(255, 255, 255, 0.85);
}
.edition-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 0;
    padding: 0;
    list-style: none;
}
.edition-chips a {
    display: inline-block;
    padding: 2px 9px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 6px;
    font-size: 0.8em;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-decoration: none;
}
.edition-chips a:hover,
.edition-chips a.is-active {
    background: var(--theme-color);
    border-color: var(--theme-color);
    color: #000;
}

@media (max-width: 768px) {
    .book-hero-grid {
        grid-template-columns: minmax(0, 1fr);
        gap: 20px;
    }
    .book-cover {
        max-width: 200px;
    }
    .book-hero-text h1 {
        font-size: 1.8em;
    }
}
@media (max-width: 480px) {
    .book-card {
        grid-template-columns: 84px minmax(0, 1fr);
        gap: 12px;
        padding: 12px;
    }
    .book-details dl {
        grid-template-columns: minmax(0, 1fr);
        gap: 0;
    }
    .book-details dd {
        margin-bottom: 8px;
    }
    .author-box {
        grid-template-columns: minmax(0, 1fr);
        gap: 12px;
    }
    .author-photo {
        width: 72px;
        height: 72px;
    }
}