/* ═══════════ BOOK SIDEBAR ═══════════ */

.book-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 240px;
    height: 100vh;
    overflow-y: auto;
    border-right: 1px solid var(--border);
    padding: 1.5rem 0;
    background: var(--bg-surface);
    z-index: 50;
    font-size: .82rem;
}

.book-sidebar a {
    display: block;
    padding: .3rem 1.25rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-left: 2px solid transparent;
}
.book-sidebar a:hover { color: var(--accent); border-left-color: var(--accent); }
.book-sidebar a.active { color: var(--accent); border-left-color: var(--accent); font-weight: 600; }

.book-sidebar .sb-home {
    padding: 0 1.25rem .75rem;
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border);
    margin-bottom: .5rem;
    display: flex;
    align-items: center;
    gap: .5rem;
}
.book-sidebar .sb-home a { display: inline; padding: 0; color: inherit; border: none; }
.book-sidebar .sb-home span { font-size: .75rem; font-weight: 400; color: var(--text-dim); }

.book-sidebar .sb-lang {
    padding: 0 1.25rem .5rem;
    font-size: .85rem;
}
.book-sidebar .sb-lang a { display: inline; padding: 0; color: var(--text-dim); border: none; }
.book-sidebar .sb-lang a.active { color: var(--accent); font-weight: 600; border: none; }

.book-sidebar .sb-section {
    padding: .5rem 1.25rem .15rem;
    font-weight: 700;
    font-size: .78rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: .04em;
    margin-top: .5rem;
}

/* Shift content when sidebar is present */
body.has-sidebar .book-content {
    margin-left: 240px;
}

body.has-sidebar nav {
    left: 240px;
    width: calc(100% - 240px);
}

/* ═══════════ BOOK PAGES ═══════════ */

.book-content {
    max-width: 760px;
    margin: 0 auto;
    padding: 6rem 2rem 3rem;
}

.book-content h1 {
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 2rem;
}

.book-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 2.5rem;
    margin-bottom: 0.8rem;
}

.book-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.6rem;
}

.book-content h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.book-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.book-content ul, .book-content ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.book-content li {
    margin-bottom: 0.4rem;
    line-height: 1.7;
}

.book-content pre {
    margin-bottom: 1.2rem;
}

.book-content code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: var(--bg-code);
    padding: 0.15em 0.4em;
    border-radius: 4px;
}

.book-content pre code {
    background: none;
    padding: 0;
}

.book-content blockquote {
    border-left: 3px solid var(--accent);
    padding: 0.5rem 1rem;
    margin: 1rem 0;
    background: var(--bg-surface);
    border-radius: 0 8px 8px 0;
    color: var(--text-secondary);
}

.book-content blockquote p { margin-bottom: 0; }

.book-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2rem 0;
}

.book-content a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-color: rgba(167, 139, 250, 0.25);
    text-underline-offset: 2px;
}
.book-content a:hover {
    text-decoration-color: var(--accent);
}

/* Tables */
.book-content .table-wrapper {
    overflow-x: auto;
    margin-bottom: 1.2rem;
    -webkit-overflow-scrolling: touch;
}

.book-content table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.book-content th, .book-content td {
    padding: 0.5rem 0.8rem;
    border: 1px solid var(--border);
    text-align: left;
}

.book-content th {
    background: var(--bg-surface);
    font-weight: 600;
}

.book-content td {
    color: var(--text-primary);
}

/* Breadcrumb */
.book-breadcrumb {
    margin-bottom: 1rem;
}

.book-breadcrumb a {
    font-size: 0.88rem;
    color: var(--text-secondary);
    text-decoration: none;
}
.book-breadcrumb a:hover { color: var(--accent); }

/* Prev/Next navigation */
.book-nav {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.book-nav a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.15s;
}
.book-nav a:hover { color: var(--accent); }
.book-nav-next { text-align: right; }

/* Book subtitle on index */
.book-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

/* Table of contents */
.book-toc {
    margin-bottom: 1.5rem;
}

.book-toc li {
    margin-bottom: 0.3rem;
}

.book-toc a {
    text-decoration: none;
    color: var(--text-primary);
}
.book-toc a:hover { color: var(--accent); }

/* ═══════════ BOOK RESPONSIVE ═══════════ */
@media (max-width: 768px) {
    .book-sidebar {
        position: relative;
        width: 100%;
        height: auto;
        max-height: 50vh;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    body.has-sidebar .book-content {
        margin-left: 0;
    }

    body.has-sidebar nav {
        left: 0;
        width: 100%;
    }

    .book-content {
        padding: 5rem 1.2rem 2rem;
    }

    .book-content h1 { font-size: 1.7rem; }
    .book-content h2 { font-size: 1.3rem; }
    .book-content h3 { font-size: 1.1rem; }

    .book-content pre { font-size: 0.75rem; }

    .book-nav { flex-direction: column; gap: 0.5rem; }
    .book-nav-next { text-align: left; }
}