/* ============================================================
   Book Reader — Dark Fantasy Theme
   Matches D&D 5e Reference app styling
   ============================================================ */

/* --- Design Tokens (mirrored from style.css) --- */
:root {
    --surface-base: #1a1510;
    --surface-raised: #231e18;
    --surface-card: #2a2419;
    --surface-overlay: #302923;
    --surface-input: #1e1914;

    --text-primary: #e8dcc8;
    --text-secondary: #c4b699;
    --text-muted: #8a7e6b;

    --accent-gold: #c4a35a;
    --accent-copper: #b87333;
    --accent-red: #922610;
    --accent-red-light: #c23a1a;
    --accent-green: #5a7247;

    --border: #3d3429;
    --border-hover: #574a3a;
    --stat-block-border: #922610;

    --parchment: #f4e4c1;
    --parchment-dark: #e8d5a3;
    --text-on-parchment: #1a1510;

    --font-heading: 'Palatino Linotype', Palatino, 'Book Antiqua', Georgia, 'Times New Roman', serif;
    --font-body: 'Crimson Pro', 'Palatino Linotype', Palatino, Georgia, serif;
    --font-mono: 'SF Mono', 'Fira Code', Consolas, monospace;

    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.6);

    --sidebar-width: 260px;
    --chapter-nav-width: 240px;
    --top-bar-height: 52px;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    background: var(--surface-base);
    color: var(--text-primary);
    line-height: 1.65;
    min-height: 100vh;
    overflow: hidden;
}

/* --- Top Bar --- */
.book-top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--top-bar-height);
    background: var(--surface-raised);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 var(--space-md);
    gap: var(--space-md);
    z-index: 100;
}

.back-link {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--accent-gold);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
}

.back-link:hover {
    color: var(--parchment);
}

.book-top-bar__title {
    flex: 1;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: normal;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: center;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-xs);
    flex-shrink: 0;
}

/* --- Layout --- */
.book-layout {
    display: flex;
    margin-top: var(--top-bar-height);
    height: calc(100vh - var(--top-bar-height));
}

/* --- Book Sidebar --- */
.book-sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background: var(--surface-raised);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

.book-sidebar__content {
    padding: var(--space-sm) 0;
}

.book-sidebar__loading {
    padding: var(--space-lg);
    color: var(--text-muted);
    text-align: center;
    font-size: 0.875rem;
}

.book-sidebar__group {
    margin-bottom: var(--space-sm);
}

.book-sidebar__group-label {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}

.book-sidebar__item {
    display: block;
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: none;
    border: none;
    text-align: left;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.85rem;
    cursor: pointer;
    line-height: 1.4;
    transition: background 0.15s, color 0.15s;
}

.book-sidebar__item:hover {
    background: var(--surface-overlay);
    color: var(--text-primary);
}

.book-sidebar__item--active {
    background: var(--surface-card);
    color: var(--accent-gold);
    border-left: 3px solid var(--accent-gold);
    padding-left: calc(var(--space-md) - 3px);
}

.book-sidebar__item-source {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-left: var(--space-xs);
}

/* --- Chapter Nav --- */
.chapter-nav {
    width: var(--chapter-nav-width);
    flex-shrink: 0;
    background: var(--surface-base);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    display: none;
}

.chapter-nav--visible {
    display: block;
}

.chapter-nav__header {
    position: sticky;
    top: 0;
    background: var(--surface-base);
    padding: var(--space-md);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 5;
}

.chapter-nav__title {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    color: var(--accent-gold);
    font-weight: normal;
}

.chapter-nav__close {
    display: none;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.5rem;
    padding: 0 var(--space-xs);
    line-height: 1;
}

.chapter-nav__list {
    list-style: none;
    padding: var(--space-sm) 0;
}

.chapter-nav__item {
    display: block;
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: none;
    border: none;
    text-align: left;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.8rem;
    cursor: pointer;
    line-height: 1.4;
    transition: background 0.15s, color 0.15s;
}

.chapter-nav__item:hover {
    background: var(--surface-overlay);
    color: var(--text-primary);
}

.chapter-nav__item--active {
    color: var(--accent-gold);
    background: var(--surface-raised);
}

.chapter-nav__ordinal {
    color: var(--text-muted);
    margin-right: var(--space-xs);
    font-size: 0.75rem;
}

/* --- Reading Pane --- */
.reading-pane {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    padding: var(--space-2xl) var(--space-xl);
    max-width: 100%;
}

.reading-pane__welcome {
    text-align: center;
    padding: var(--space-2xl) var(--space-lg);
    color: var(--text-muted);
}

.reading-pane__welcome h2 {
    font-family: var(--font-heading);
    color: var(--accent-gold);
    font-size: 1.8rem;
    font-weight: normal;
    margin-bottom: var(--space-md);
}

.reading-pane__welcome p {
    font-size: 1rem;
    margin-bottom: var(--space-sm);
}

.reading-pane__hint {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.reading-pane__content {
    max-width: 720px;
    margin: 0 auto;
    overflow-x: hidden;
}

/* Images must fit within the reading pane */
.reading-pane__content img {
    max-width: 100%;
    height: auto;
}

.reading-pane__content .entry-image {
    margin: 1.25rem 0;
}

.reading-pane__content .entry-image img {
    max-width: 100%;
    max-height: 60vh;
    height: auto;
    border-radius: 4px;
    object-fit: contain;
}

.reading-pane__content .entry-image figcaption {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
    margin-top: 0.35rem;
    text-align: center;
}

/* --- Chapter Content Typography --- */
.reading-pane__content h1 {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--accent-gold);
    font-weight: normal;
    margin: 0 0 var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--border);
}

.reading-pane__content h2 {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    color: var(--accent-gold);
    font-weight: normal;
    margin: var(--space-2xl) 0 var(--space-md);
}

.reading-pane__content h3 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    color: var(--accent-copper);
    font-weight: normal;
    margin: var(--space-xl) 0 var(--space-md);
}

.reading-pane__content h4 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--text-primary);
    margin: var(--space-lg) 0 var(--space-sm);
}

.reading-pane__content h5 {
    font-family: var(--font-heading);
    font-size: 1rem;
    color: var(--text-secondary);
    margin: var(--space-md) 0 var(--space-sm);
}

.reading-pane__content h6 {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
    margin: var(--space-md) 0 var(--space-sm);
}

.reading-pane__content p {
    margin-bottom: var(--space-md);
}

.reading-pane__content ul,
.reading-pane__content ol {
    margin-bottom: var(--space-md);
    padding-left: var(--space-xl);
}

.reading-pane__content li {
    margin-bottom: var(--space-xs);
}

.reading-pane__content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.reading-pane__content em {
    color: var(--text-secondary);
}

/* --- Entry Sub-sections --- */
.reading-pane__content .entry-sub {
    margin-bottom: var(--space-md);
}

/* --- Insets (sidebars) --- */
.reading-pane__content .entry-inset {
    background: var(--surface-card);
    border-left: 3px solid var(--accent-copper);
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-lg) 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.reading-pane__content .entry-inset > strong:first-child {
    display: block;
    font-family: var(--font-heading);
    font-size: 1.05rem;
    color: var(--accent-copper);
    margin-bottom: var(--space-sm);
}

/* --- Quotes --- */
.reading-pane__content .entry-quote {
    border-left: 3px solid var(--accent-gold);
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-lg) 0;
    background: var(--surface-raised);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-style: italic;
}

.reading-pane__content .entry-quote-by {
    font-style: normal;
    color: var(--text-muted);
    margin-top: var(--space-sm);
    font-size: 0.9rem;
}

/* --- Tables --- */
.reading-pane__content .entry-table-wrap {
    overflow-x: auto;
    margin: var(--space-lg) 0;
    border-radius: var(--radius-sm);
}

.reading-pane__content .entry-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.reading-pane__content .entry-table caption {
    font-family: var(--font-heading);
    font-size: 1rem;
    color: var(--accent-gold);
    text-align: left;
    padding: var(--space-sm) var(--space-md);
    caption-side: top;
}

.reading-pane__content .entry-table th {
    background: var(--surface-overlay);
    color: var(--accent-gold);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    border-bottom: 2px solid var(--border);
}

.reading-pane__content .entry-table td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.reading-pane__content .entry-table tbody tr:hover {
    background: var(--surface-raised);
}

/* --- Entry items (name-value pairs) --- */
.reading-pane__content .entry-item {
    margin-bottom: var(--space-sm);
}

.reading-pane__content .entry-item strong {
    color: var(--accent-copper);
}

/* --- Tag styling (from tags.js) --- */
.reading-pane__content .ref-spell,
.reading-pane__content .ref-creature,
.reading-pane__content .ref-condition,
.reading-pane__content .ref-item,
.reading-pane__content .ref-feat,
.reading-pane__content .ref-race,
.reading-pane__content .ref-background,
.reading-pane__content .ref-class,
.reading-pane__content .ref-action,
.reading-pane__content .ref-variantrule {
    color: var(--accent-gold);
    cursor: pointer;
    text-decoration: none;
    border-bottom: 1px dotted var(--accent-gold);
}

.reading-pane__content .ref-spell:hover,
.reading-pane__content .ref-creature:hover,
.reading-pane__content .ref-condition:hover,
.reading-pane__content .ref-item:hover,
.reading-pane__content .ref-feat:hover,
.reading-pane__content .ref-race:hover,
.reading-pane__content .ref-background:hover,
.reading-pane__content .ref-class:hover,
.reading-pane__content .ref-action:hover,
.reading-pane__content .ref-variantrule:hover {
    color: var(--parchment);
    border-bottom-color: var(--parchment);
}

.reading-pane__content .tag-damage,
.reading-pane__content .tag-dice {
    color: var(--accent-red-light);
    font-weight: 600;
}

.reading-pane__content .tag-dc {
    color: var(--accent-copper);
    font-weight: 600;
}

.reading-pane__content .tag-skill,
.reading-pane__content .tag-sense,
.reading-pane__content .tag-status {
    font-weight: 500;
}

.reading-pane__content .tag-book {
    font-style: italic;
    color: var(--text-secondary);
}

/* --- Chapter Toggle (mobile) --- */
.chapter-toggle {
    position: fixed;
    bottom: var(--space-md);
    right: var(--space-md);
    display: none;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background: var(--surface-overlay);
    color: var(--accent-gold);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.8rem;
    box-shadow: var(--shadow-md);
    z-index: 50;
}

/* --- Sidebar Overlay --- */
.book-sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 80;
}

.book-sidebar-overlay--visible {
    display: block;
}

/* --- Loading / Error States --- */
.reading-pane__loading {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--text-muted);
}

.reading-pane__error {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--accent-red-light);
}

/* --- Scrollbar --- */
.book-sidebar::-webkit-scrollbar,
.chapter-nav::-webkit-scrollbar,
.reading-pane::-webkit-scrollbar {
    width: 6px;
}

.book-sidebar::-webkit-scrollbar-track,
.chapter-nav::-webkit-scrollbar-track,
.reading-pane::-webkit-scrollbar-track {
    background: transparent;
}

.book-sidebar::-webkit-scrollbar-thumb,
.chapter-nav::-webkit-scrollbar-thumb,
.reading-pane::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.book-sidebar::-webkit-scrollbar-thumb:hover,
.chapter-nav::-webkit-scrollbar-thumb:hover,
.reading-pane::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

/* ============================================================
   Responsive
   ============================================================ */

/* Tablet — collapse chapter nav to overlay */
@media (max-width: 1024px) {
    .chapter-nav {
        position: fixed;
        top: var(--top-bar-height);
        left: 0;
        bottom: 0;
        z-index: 70;
        width: var(--chapter-nav-width);
        box-shadow: var(--shadow-lg);
    }

    .chapter-nav__close {
        display: block;
    }

    .chapter-toggle:not([hidden]) {
        display: flex;
    }
}

/* Mobile — collapse book sidebar too */
@media (max-width: 768px) {
    .sidebar-toggle {
        display: block;
    }

    .book-sidebar {
        position: fixed;
        top: var(--top-bar-height);
        left: 0;
        bottom: 0;
        z-index: 90;
        transform: translateX(-100%);
        transition: transform 0.25s ease;
        box-shadow: none;
    }

    .book-sidebar--open {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }

    .reading-pane {
        padding: var(--space-lg) var(--space-md);
    }

    .reading-pane__content h1 {
        font-size: 1.5rem;
    }

    .reading-pane__content h2 {
        font-size: 1.3rem;
    }

    .reading-pane__content h3 {
        font-size: 1.1rem;
    }
}

/* ============================================================
   Print
   ============================================================ */
@media print {
    body {
        background: #fff;
        color: #000;
        font-family: Georgia, 'Times New Roman', serif;
        overflow: visible;
    }

    .book-top-bar,
    .book-sidebar,
    .chapter-nav,
    .chapter-toggle,
    .book-sidebar-overlay,
    .back-link {
        display: none !important;
    }

    .book-layout {
        display: block;
        height: auto;
    }

    .reading-pane {
        overflow: visible;
        padding: 0;
        max-width: none;
    }

    .reading-pane__content {
        max-width: none;
    }

    .reading-pane__content h1,
    .reading-pane__content h2,
    .reading-pane__content h3 {
        color: #000;
    }

    .reading-pane__content .entry-inset {
        background: #f5f5f5;
        border-left-color: #666;
    }

    .reading-pane__content .entry-quote {
        background: #f9f9f9;
        border-left-color: #999;
    }

    .reading-pane__content .entry-table th {
        background: #eee;
        color: #000;
    }

    .reading-pane__content .entry-table td {
        border-bottom-color: #ccc;
    }

    .reading-pane__content .ref-spell,
    .reading-pane__content .ref-creature,
    .reading-pane__content .ref-condition,
    .reading-pane__content .ref-item,
    .reading-pane__content .ref-feat {
        color: #333;
        border-bottom: none;
    }
}