/* ============================================
   FULL-WINDOW READER - Kindle-Grade Experience
   From Equations to Capital
   ============================================ */

/* CSS Variables */
:root {
    /* Dark Theme (Default) */
    --reader-bg: #050608;
    --reader-bg-secondary: #0a0c10;
    --reader-bg-panel: #0f1218;
    --reader-bg-card: #12151c;
    --reader-text: #f5f5f7;
    --reader-text-secondary: #a1a1a6;
    --reader-text-tertiary: #6e6e73;
    --reader-gold: #c9a962;
    --reader-gold-dim: rgba(201, 169, 98, 0.3);
    --reader-border: rgba(255, 255, 255, 0.08);
    --reader-border-strong: rgba(255, 255, 255, 0.15);
    
    /* Typography */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Layout */
    --topbar-height: 60px;
    --panel-width: 320px;
    
    /* Transitions */
    --ease-out: cubic-bezier(0.19, 1, 0.22, 1);
    --transition-fast: 150ms;
    --transition-normal: 300ms;
}

/* Light Theme */
[data-theme="light"] {
    --reader-bg: #ffffff;
    --reader-bg-secondary: #f5f5f7;
    --reader-bg-panel: #ffffff;
    --reader-bg-card: #f0f0f2;
    --reader-text: #1d1d1f;
    --reader-text-secondary: #6e6e73;
    --reader-text-tertiary: #a1a1a6;
    --reader-border: rgba(0, 0, 0, 0.1);
    --reader-border-strong: rgba(0, 0, 0, 0.2);
}

/* Sepia Theme */
[data-theme="sepia"] {
    --reader-bg: #f4ecd8;
    --reader-bg-secondary: #e8dcc4;
    --reader-bg-panel: #f4ecd8;
    --reader-bg-card: #e8dcc4;
    --reader-text: #3d3322;
    --reader-text-secondary: #5c4d36;
    --reader-text-tertiary: #8a7a5a;
    --reader-border: rgba(61, 51, 34, 0.15);
    --reader-border-strong: rgba(61, 51, 34, 0.25);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.reader-body {
    font-family: var(--font-body);
    background: var(--reader-bg);
    color: var(--reader-text);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

/* ============================================
   TOP BAR
   ============================================ */

.reader-topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--topbar-height);
    background: var(--reader-bg-secondary);
    border-bottom: 1px solid var(--reader-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-lg);
    z-index: 1000;
    transition: transform var(--transition-normal) var(--ease-out);
}

.reader-topbar.hidden {
    transform: translateY(-100%);
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.topbar-back {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 10px;
    color: var(--reader-text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.topbar-back:hover {
    background: var(--reader-gold-dim);
    border-color: var(--reader-gold);
    color: var(--reader-gold);
}

.topbar-back svg {
    width: 20px;
    height: 20px;
}

.topbar-brand {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--reader-gold);
}

.topbar-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
}

.volume-title {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: var(--space-xs) var(--space-lg);
    background: var(--reader-gold-dim);
    border-radius: 10px;
    border: 1px solid var(--reader-border);
}

.volume-title .vol-label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--reader-gold);
}

.volume-title .vol-name {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--reader-text);
    font-family: var(--font-display);
}

.volume-switcher {
    display: none; /* Hidden for preview - only shown to paying subscribers */
    gap: var(--space-sm);
    background: var(--reader-bg-card);
    padding: var(--space-xs);
    border-radius: 10px;
    border: 1px solid var(--reader-border);
}

.volume-switch-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: var(--space-xs) var(--space-md);
    background: transparent;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.volume-switch-btn .vol-label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--reader-text-tertiary);
}

.volume-switch-btn .vol-title {
    font-size: 0.75rem;
    color: var(--reader-text-secondary);
    white-space: nowrap;
}

.volume-switch-btn:hover {
    background: var(--reader-bg);
}

.volume-switch-btn.active {
    background: var(--reader-gold-dim);
}

.volume-switch-btn.active .vol-label {
    color: var(--reader-gold);
}

.volume-switch-btn.active .vol-title {
    color: var(--reader-text);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.8rem;
    color: var(--reader-text-tertiary);
}

.breadcrumb-chapter {
    color: var(--reader-text-secondary);
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.topbar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid var(--reader-border);
    border-radius: 10px;
    color: var(--reader-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.topbar-btn:hover {
    background: var(--reader-bg-card);
    color: var(--reader-text);
    border-color: var(--reader-border-strong);
}

.topbar-btn svg {
    width: 20px;
    height: 20px;
}

.topbar-cta {
    display: inline-flex;
    align-items: center;
    padding: var(--space-sm) var(--space-lg);
    background: var(--reader-gold);
    color: #050608;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: all var(--transition-fast);
}

.topbar-cta:hover {
    background: #d4b978;
    transform: translateY(-1px);
}

/* ============================================
   MAIN LAYOUT
   ============================================ */

.reader-layout {
    display: flex;
    height: 100vh;
    padding-top: var(--topbar-height);
}

/* ============================================
   PANELS (Left & Right)
   ============================================ */

.reader-panel {
    width: var(--panel-width);
    height: calc(100vh - var(--topbar-height));
    background: var(--reader-bg-panel);
    border-right: 1px solid var(--reader-border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: transform var(--transition-normal) var(--ease-out), 
                width var(--transition-normal) var(--ease-out);
    overflow: hidden;
}

.panel-right {
    border-right: none;
    border-left: 1px solid var(--reader-border);
}

.reader-panel.collapsed {
    width: 0;
    transform: translateX(-100%);
}

.panel-right.collapsed {
    transform: translateX(100%);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--reader-border);
    flex-shrink: 0;
}

.panel-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--reader-text);
}

.panel-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--reader-text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.panel-close:hover {
    background: var(--reader-bg-card);
    color: var(--reader-text);
}

.panel-close svg {
    width: 18px;
    height: 18px;
}

.panel-tabs {
    display: flex;
    border-bottom: 1px solid var(--reader-border);
    flex-shrink: 0;
}

.panel-tab {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--reader-text-tertiary);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.panel-tab:hover {
    color: var(--reader-text-secondary);
    background: var(--reader-bg-card);
}

.panel-tab.active {
    color: var(--reader-gold);
    border-bottom-color: var(--reader-gold);
}

.panel-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ============================================
   TOC Navigation
   ============================================ */

.toc-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.toc-part {
    margin-bottom: var(--space-md);
}

.toc-part-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: linear-gradient(90deg, var(--reader-gold-dim), transparent);
    border-left: 3px solid var(--reader-gold);
    margin-bottom: var(--space-sm);
}

.toc-part-number {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--reader-gold);
}

.toc-part-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--reader-text);
}

.toc-chapters {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    padding-left: var(--space-md);
}

.toc-chapter {
    display: flex;
    flex-direction: column;
}

.toc-chapter-link {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--reader-text-secondary);
    text-decoration: none;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toc-chapter-link:hover {
    background: var(--reader-bg-card);
    color: var(--reader-text);
}

.toc-chapter-link.active {
    background: var(--reader-gold-dim);
    color: var(--reader-gold);
}

.toc-chapter-link.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.toc-chapter-link.locked::after {
    content: '🔒';
    margin-left: auto;
    font-size: 0.75rem;
}

.toc-chapter-numeral {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--reader-gold);
    min-width: 32px;
}

.toc-chapter-title {
    font-size: 0.85rem;
    line-height: 1.4;
}

.toc-chapter-page {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--reader-text-tertiary);
    font-family: var(--font-mono);
}

.toc-sections {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xs);
    padding-left: calc(var(--space-md) + 32px);
    padding-top: var(--space-xs);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

.toc-chapter.expanded .toc-sections {
    max-height: 500px;
}

.toc-section-link {
    display: flex;
    align-items: center;
    padding: var(--space-xs) var(--space-sm);
    color: var(--reader-text-tertiary);
    font-size: 0.8rem;
    text-decoration: none;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.toc-section-link:hover {
    background: var(--reader-bg-card);
    color: var(--reader-text-secondary);
}

.toc-section-link::before {
    content: '';
    width: 4px;
    height: 4px;
    background: var(--reader-text-tertiary);
    border-radius: 50%;
    margin-right: var(--space-sm);
}

/* Dot Leader Effect for TOC */
.toc-section-link .section-title {
    flex: 1;
}

.toc-section-link .section-page {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--reader-text-tertiary);
}

/* ============================================
   MAIN READER AREA
   ============================================ */

.reader-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--reader-bg);
    overflow: hidden;
}

.reader-loading {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    z-index: 10;
    background: var(--reader-bg);
    transition: opacity var(--transition-normal);
}

.reader-loading.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-skeleton {
    width: 100%;
    max-width: 600px;
    aspect-ratio: 8.5 / 11;
}

.skeleton-page {
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        var(--reader-bg-card) 0%, 
        var(--reader-bg-secondary) 50%, 
        var(--reader-bg-card) 100%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 8px;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.loading-text {
    color: var(--reader-text-tertiary);
    font-size: 0.9rem;
}

/* Page Container */
.page-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    height: 100%;
    padding: var(--space-xl);
    overflow: hidden;
}

.page-canvas {
    flex: 1;
    width: 100%;
    max-width: 800px;
    background: var(--reader-bg-panel);
    border: 1px solid var(--reader-border);
    border-radius: 4px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* Simulated Page Content */
.page-content {
    flex: 1;
    padding: var(--space-2xl);
    overflow-y: auto;
    font-size: var(--reader-font-size, 18px);
    line-height: 1.8;
}

.page-content h1 {
    font-family: var(--font-display);
    font-size: 2.5em;
    font-weight: 600;
    color: var(--reader-gold);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.page-content h2 {
    font-family: var(--font-display);
    font-size: 1.75em;
    font-weight: 600;
    color: var(--reader-text);
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-md);
}

.page-content h3 {
    font-family: var(--font-display);
    font-size: 1.25em;
    font-weight: 600;
    color: var(--reader-text);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-sm);
}

.page-content p {
    margin-bottom: var(--space-md);
    color: var(--reader-text-secondary);
}

.page-content code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--reader-bg-card);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--reader-gold);
}

.page-content pre {
    background: var(--reader-bg);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    padding: var(--space-lg);
    overflow-x: auto;
    margin: var(--space-lg) 0;
}

.page-content pre code {
    background: transparent;
    padding: 0;
}

.page-content .equation {
    display: block;
    text-align: center;
    padding: var(--space-lg);
    font-family: var(--font-display);
    font-size: 1.2em;
    font-style: italic;
    color: var(--reader-text);
}

.page-content figure {
    margin: var(--space-xl) 0;
    text-align: center;
}

.page-content figure img {
    max-width: 100%;
    border-radius: 8px;
}

.page-content figcaption {
    margin-top: var(--space-sm);
    font-size: 0.9em;
    color: var(--reader-text-tertiary);
    font-style: italic;
}

/* Page Footer */
.page-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    border-top: 1px solid var(--reader-border);
    flex-shrink: 0;
}

.page-number {
    font-size: 0.85rem;
    color: var(--reader-text-tertiary);
    font-family: var(--font-mono);
}

.page-progress {
    flex: 1;
    max-width: 200px;
    height: 4px;
    background: var(--reader-bg-card);
    border-radius: 2px;
    margin-left: var(--space-lg);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--reader-gold);
    border-radius: 2px;
    transition: width var(--transition-fast);
}

/* Navigation Arrows */
.nav-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 80px;
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    color: var(--reader-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    z-index: 5;
}

.nav-prev {
    left: var(--space-lg);
}

.nav-next {
    right: var(--space-lg);
}

.nav-arrow:hover {
    background: var(--reader-gold-dim);
    border-color: var(--reader-gold);
    color: var(--reader-gold);
}

.nav-arrow:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.nav-arrow svg {
    width: 24px;
    height: 24px;
}

/* ============================================
   PREVIEW GATE
   ============================================ */

.preview-gate {
    position: absolute;
    inset: 0;
    background: rgba(5, 6, 8, 0.95);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 20;
    padding: var(--space-xl);
}

.preview-gate.visible {
    display: flex;
}

.gate-content {
    max-width: 480px;
    text-align: center;
}

.gate-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-lg);
    background: var(--reader-gold-dim);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.gate-icon svg {
    width: 32px;
    height: 32px;
    stroke: var(--reader-gold);
}

.gate-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--reader-text);
    margin-bottom: var(--space-sm);
}

.gate-message {
    color: var(--reader-text-secondary);
    margin-bottom: var(--space-xl);
}

.gate-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.gate-cta-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    background: var(--reader-gold);
    color: #050608;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 10px;
    transition: all var(--transition-fast);
}

.gate-cta-primary:hover {
    background: #d4b978;
    transform: translateY(-2px);
}

.gate-cta-secondary {
    background: transparent;
    border: 1px solid var(--reader-border);
    padding: var(--space-sm) var(--space-lg);
    color: var(--reader-text-secondary);
    font-size: 0.9rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.gate-cta-secondary:hover {
    border-color: var(--reader-border-strong);
    color: var(--reader-text);
}

.gate-pricing {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
}

.gate-price-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md);
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 12px;
    min-width: 120px;
}

.gate-price-option.featured {
    border-color: var(--reader-gold);
    background: var(--reader-gold-dim);
}

.price-badge {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--reader-gold);
}

.price-label {
    font-size: 0.8rem;
    color: var(--reader-text-secondary);
}

.price-amount {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--reader-text);
}

/* ============================================
   COMPANION PANEL (Right)
   ============================================ */

.companion-section {
    margin-bottom: var(--space-xl);
}

.companion-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--reader-text-tertiary);
    margin-bottom: var(--space-md);
}

.workspace-card {
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 12px;
    padding: var(--space-md);
}

.workspace-header {
    margin-bottom: var(--space-md);
}

.workspace-chapter {
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--reader-gold);
    margin-bottom: var(--space-2xs);
}

.workspace-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--reader-text);
}

.workspace-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.workspace-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--reader-bg);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    color: var(--reader-text-secondary);
    font-size: 0.85rem;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.workspace-btn:hover {
    border-color: var(--reader-border-strong);
    color: var(--reader-text);
}

.workspace-btn.primary {
    background: var(--reader-gold-dim);
    border-color: var(--reader-gold);
    color: var(--reader-gold);
}

.workspace-btn.primary:hover {
    background: var(--reader-gold);
    color: #050608;
}

.workspace-btn svg {
    width: 16px;
    height: 16px;
}

.figures-list,
.datasets-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.figures-empty,
.datasets-empty {
    font-size: 0.85rem;
    color: var(--reader-text-tertiary);
    font-style: italic;
}

.figure-item,
.dataset-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.figure-item:hover,
.dataset-item:hover {
    border-color: var(--reader-gold);
}

.figure-badge {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    padding: 2px 6px;
    background: var(--reader-gold);
    color: #050608;
    border-radius: 4px;
}

.figure-name,
.dataset-name {
    font-size: 0.85rem;
    color: var(--reader-text-secondary);
}

.definitions-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.definition-item {
    padding: var(--space-sm);
    background: var(--reader-bg-card);
    border-radius: 8px;
}

.definition-term {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--reader-gold);
    margin-bottom: 2px;
}

.definition-desc {
    font-size: 0.8rem;
    color: var(--reader-text-tertiary);
}

/* ============================================
   MOBILE TOGGLES
   ============================================ */

.mobile-toc-toggle,
.mobile-companion-toggle {
    display: none;
    position: fixed;
    bottom: var(--space-lg);
    width: 48px;
    height: 48px;
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 50%;
    color: var(--reader-text-secondary);
    cursor: pointer;
    z-index: 100;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.mobile-toc-toggle {
    left: var(--space-lg);
}

.mobile-companion-toggle {
    right: var(--space-lg);
}

.mobile-toc-toggle svg,
.mobile-companion-toggle svg {
    width: 24px;
    height: 24px;
}

/* ============================================
   SEARCH MODAL
   ============================================ */

.search-modal {
    position: fixed;
    inset: 0;
    background: rgba(5, 6, 8, 0.9);
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding-top: 15vh;
    z-index: 2000;
}

.search-modal.visible {
    display: flex;
}

.search-modal-content {
    width: 100%;
    max-width: 600px;
    background: var(--reader-bg-panel);
    border: 1px solid var(--reader-border);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.search-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    border-bottom: 1px solid var(--reader-border);
}

.search-input-wrapper svg {
    width: 24px;
    height: 24px;
    color: var(--reader-text-tertiary);
    flex-shrink: 0;
}

#search-input {
    flex: 1;
    background: transparent;
    border: none;
    font-size: 1.1rem;
    color: var(--reader-text);
    outline: none;
}

#search-input::placeholder {
    color: var(--reader-text-tertiary);
}

.search-clear {
    background: transparent;
    border: none;
    color: var(--reader-text-tertiary);
    cursor: pointer;
    padding: var(--space-xs);
}

.search-clear svg {
    width: 18px;
    height: 18px;
}

.search-results-modal {
    max-height: 400px;
    overflow-y: auto;
    padding: var(--space-md);
}

.search-hint {
    color: var(--reader-text-tertiary);
    font-size: 0.9rem;
    text-align: center;
    padding: var(--space-xl);
}

.search-result-item {
    display: block;
    padding: var(--space-md);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.search-result-item:hover {
    background: var(--reader-bg-card);
}

.search-result-chapter {
    font-size: 0.75rem;
    color: var(--reader-gold);
    margin-bottom: var(--space-2xs);
}

.search-result-title {
    font-size: 0.95rem;
    color: var(--reader-text);
    margin-bottom: var(--space-2xs);
}

.search-result-excerpt {
    font-size: 0.85rem;
    color: var(--reader-text-tertiary);
}

.search-result-excerpt mark {
    background: var(--reader-gold-dim);
    color: var(--reader-gold);
}

.search-shortcuts {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    padding: var(--space-md);
    border-top: 1px solid var(--reader-border);
    font-size: 0.8rem;
    color: var(--reader-text-tertiary);
}

.search-shortcuts kbd {
    display: inline-block;
    padding: 2px 6px;
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    margin-right: var(--space-xs);
}

/* ============================================
   SETTINGS PANEL
   ============================================ */

.settings-panel {
    position: fixed;
    top: var(--topbar-height);
    right: var(--space-lg);
    width: 280px;
    background: var(--reader-bg-panel);
    border: 1px solid var(--reader-border);
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    z-index: 1500;
    display: none;
    transform: translateY(-10px);
    opacity: 0;
    transition: all var(--transition-fast);
}

.settings-panel.visible {
    display: block;
    transform: translateY(10px);
    opacity: 1;
}

.settings-content {
    padding: var(--space-lg);
}

.settings-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--reader-text);
    margin-bottom: var(--space-lg);
}

.settings-group {
    margin-bottom: var(--space-lg);
}

.settings-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--reader-text-tertiary);
    margin-bottom: var(--space-sm);
}

.settings-options {
    display: flex;
    gap: var(--space-sm);
}

.theme-btn,
.layout-btn {
    flex: 1;
    padding: var(--space-sm);
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    color: var(--reader-text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-btn:hover,
.layout-btn:hover {
    border-color: var(--reader-border-strong);
}

.theme-btn.active,
.layout-btn.active {
    background: var(--reader-gold-dim);
    border-color: var(--reader-gold);
    color: var(--reader-gold);
}

.settings-slider {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.size-btn {
    width: 32px;
    height: 32px;
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    color: var(--reader-text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.size-btn:hover {
    border-color: var(--reader-gold);
    color: var(--reader-gold);
}

#font-size-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: var(--reader-bg-card);
    border-radius: 2px;
    outline: none;
}

#font-size-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--reader-gold);
    border-radius: 50%;
    cursor: pointer;
}

/* ============================================
   SHORTCUTS HELP
   ============================================ */

.shortcuts-help {
    position: fixed;
    inset: 0;
    background: rgba(5, 6, 8, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 3000;
}

.shortcuts-help.visible {
    display: flex;
}

.shortcuts-content {
    background: var(--reader-bg-panel);
    border: 1px solid var(--reader-border);
    border-radius: 16px;
    padding: var(--space-xl);
    max-width: 400px;
}

.shortcuts-content h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--reader-text);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.shortcuts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.shortcut {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background: var(--reader-bg-card);
    border-radius: 8px;
}

.shortcut kbd {
    display: inline-block;
    min-width: 28px;
    padding: 4px 8px;
    background: var(--reader-bg);
    border: 1px solid var(--reader-border);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--reader-gold);
    text-align: center;
}

.shortcut span {
    font-size: 0.85rem;
    color: var(--reader-text-secondary);
}

.shortcuts-close {
    display: block;
    width: 100%;
    padding: var(--space-md);
    background: var(--reader-gold);
    border: none;
    border-radius: 10px;
    color: #050608;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.shortcuts-close:hover {
    background: #d4b978;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1200px) {
    .panel-right {
        width: 0;
        transform: translateX(100%);
    }
    
    .mobile-companion-toggle {
        display: flex;
    }
}

@media (max-width: 900px) {
    .panel-left {
        position: fixed;
        left: 0;
        top: var(--topbar-height);
        bottom: 0;
        z-index: 500;
        transform: translateX(-100%);
    }
    
    .panel-left.open {
        transform: translateX(0);
    }
    
    .panel-right {
        position: fixed;
        right: 0;
        top: var(--topbar-height);
        bottom: 0;
        z-index: 500;
        width: var(--panel-width);
    }
    
    .panel-right.open {
        transform: translateX(0);
    }
    
    .mobile-toc-toggle {
        display: flex;
    }
    
    .nav-arrow {
        width: 40px;
        height: 60px;
    }
    
    .nav-prev {
        left: var(--space-sm);
    }
    
    .nav-next {
        right: var(--space-sm);
    }
}

@media (max-width: 768px) {
    .topbar-center {
        display: none;
    }
    
    .topbar-cta {
        display: none;
    }
    
    .page-container {
        padding: var(--space-md);
    }
    
    .nav-arrow {
        display: none;
    }
    
    .settings-panel {
        left: var(--space-md);
        right: var(--space-md);
        width: auto;
    }
    
    .shortcuts-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .reader-topbar,
    .reader-panel,
    .nav-arrow,
    .mobile-toc-toggle,
    .mobile-companion-toggle {
        display: none !important;
    }
    
    .reader-main {
        padding: 0;
    }
    
    .page-canvas {
        box-shadow: none;
        border: none;
    }
}

/* ============================================
   PAGE CONTENT - CHAPTER STARTS & SECTIONS
   ============================================ */

.page-chapter-start {
    text-align: center;
    padding: var(--space-2xl) 0 var(--space-xl);
    border-bottom: 1px solid var(--reader-border);
    margin-bottom: var(--space-xl);
}

.chapter-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
}

.part-label {
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--reader-gold);
    font-weight: 500;
}

.chapter-number {
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    color: var(--reader-text-tertiary);
}

.chapter-heading {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--reader-text);
    margin-bottom: var(--space-lg);
    line-height: 1.2;
}

.chapter-intro {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--reader-text-secondary);
    font-style: italic;
    max-width: 600px;
    margin: 0 auto;
}

.page-section {
    margin-bottom: var(--space-xl);
}

.page-section h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--reader-text);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--reader-border);
}

.page-section h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--reader-text);
    margin: var(--space-lg) 0 var(--space-sm);
}

.page-section p {
    font-size: var(--reader-font-size, 18px);
    line-height: 1.8;
    color: var(--reader-text-secondary);
    margin-bottom: var(--space-md);
}

/* Key Equations */
.key-equation {
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-left: 3px solid var(--reader-gold);
    border-radius: 8px;
    padding: var(--space-lg);
    margin: var(--space-lg) 0;
    text-align: center;
}

.key-equation.large {
    padding: var(--space-xl);
}

.equation-label {
    display: block;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--reader-gold);
    margin-bottom: var(--space-sm);
    font-weight: 500;
}

.key-equation .equation {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--reader-text);
    font-weight: 500;
}

.equation-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
    margin: var(--space-lg) 0;
}

/* Pillars Grid */
.pillars-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    margin: var(--space-lg) 0;
}

.pillar {
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    padding: var(--space-md);
}

.pillar h3 {
    font-size: 1rem;
    color: var(--reader-gold);
    margin: 0 0 var(--space-sm);
}

.pillar p {
    font-size: 0.95rem;
    margin: 0;
}

/* Concept List */
.concept-list {
    list-style: none;
    padding: 0;
    margin: var(--space-md) 0;
}

.concept-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: var(--space-sm);
    color: var(--reader-text-secondary);
    line-height: 1.6;
}

.concept-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--reader-gold);
    font-weight: bold;
}

/* Callouts */
.callout {
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    padding: var(--space-lg);
    margin: var(--space-lg) 0;
}

.callout-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.callout-theory {
    border-left: 3px solid #6366f1;
}

.callout-theory .callout-label {
    color: #6366f1;
}

.callout-rule {
    border-left: 3px solid var(--reader-gold);
}

.callout-rule .callout-label {
    color: var(--reader-gold);
}

.callout-theorem {
    border-left: 3px solid #22c55e;
}

.callout-theorem .callout-label {
    color: #22c55e;
}

.callout p {
    margin: 0;
    color: var(--reader-text-secondary);
    line-height: 1.7;
}

.callout .equation {
    margin-top: var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--reader-text);
}

/* Data Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-lg) 0;
    font-size: 0.95rem;
}

.data-table th,
.data-table td {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--reader-border);
}

.data-table th {
    background: var(--reader-bg-card);
    color: var(--reader-gold);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table td {
    color: var(--reader-text-secondary);
}

.data-table tbody tr:hover {
    background: rgba(201, 169, 98, 0.05);
}

/* Code Block */
.code-block {
    background: #0a0b0d;
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    overflow: hidden;
    margin: var(--space-lg) 0;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: rgba(201, 169, 98, 0.1);
    border-bottom: 1px solid var(--reader-border);
}

.code-lang {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--reader-gold);
    font-weight: 600;
}

.code-file {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--reader-text-tertiary);
}

.code-block pre {
    margin: 0;
    padding: var(--space-md);
    overflow-x: auto;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
    color: #e2e8f0;
}

.code-block .keyword { color: #c792ea; }
.code-block .string { color: #c3e88d; }
.code-block .function { color: #82aaff; }
.code-block .class { color: #ffcb6b; }
.code-block .number { color: #f78c6c; }
.code-block .comment { color: #546e7a; font-style: italic; }
.code-block .builtin { color: #89ddff; }

/* Example Box */
.example-box {
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    padding: var(--space-lg);
    margin: var(--space-lg) 0;
}

.example-box h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--reader-gold);
    margin: 0 0 var(--space-sm);
}

.example-box p {
    margin: 0 0 var(--space-sm);
}

.example-box .equation {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--reader-text);
    margin-top: var(--space-sm);
}

/* Chapter End Marker */
.chapter-end {
    text-align: center;
    padding: var(--space-xl) 0;
    margin-top: var(--space-xl);
    border-top: 1px solid var(--reader-border);
}

.end-marker {
    display: inline-block;
    width: 24px;
    height: 24px;
    color: var(--reader-gold);
    margin-bottom: var(--space-sm);
}

.end-text {
    font-size: 0.9rem;
    color: var(--reader-text-tertiary);
    font-style: italic;
    margin: 0;
}

/* Placeholder Note */
.placeholder-note {
    background: rgba(201, 169, 98, 0.1);
    border: 1px dashed var(--reader-gold);
    border-radius: 8px;
    padding: var(--space-md);
    margin: var(--space-lg) 0;
    text-align: center;
}

.placeholder-note p {
    margin: 0;
    color: var(--reader-gold);
    font-size: 0.9rem;
}

/* Page Error */
.page-error {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--reader-text-tertiary);
    font-style: italic;
}

/* ============================================
   PAGE TOOLBAR & BOOKMARK BUTTON
   ============================================ */

.page-toolbar {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    display: flex;
    gap: var(--space-sm);
    z-index: 10;
    opacity: 0;
    transition: opacity var(--transition-fast) var(--ease-out);
}

.page-content:hover .page-toolbar {
    opacity: 1;
}

.page-bookmark-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    color: var(--reader-text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast) var(--ease-out);
}

.page-bookmark-btn:hover {
    background: var(--reader-bg-panel);
    border-color: var(--reader-gold-dim);
    color: var(--reader-gold);
    transform: scale(1.1);
}

.page-bookmark-btn.active {
    background: var(--reader-gold);
    border-color: var(--reader-gold);
    color: var(--reader-bg);
}

.page-bookmark-btn.active:hover {
    background: var(--reader-gold);
    transform: scale(1.1);
}

.page-bookmark-btn svg {
    width: 18px;
    height: 18px;
}

/* ============================================
   SCROLL VIEW LAYOUT
   ============================================ */

.page-container.scroll-view {
    overflow-y: auto;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

.page-container.scroll-view .page-wrapper {
    min-height: auto;
    margin-bottom: var(--space-xl);
}

.page-container.scroll-view .page-content {
    max-height: none;
    overflow: visible;
}

/* ============================================
   BOOKMARK LIST STYLES
   ============================================ */

.bookmark-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    margin-bottom: var(--space-sm);
    cursor: pointer;
    transition: all var(--transition-fast) var(--ease-out);
}

.bookmark-item:hover {
    background: var(--reader-bg-panel);
    border-color: var(--reader-gold-dim);
}

.bookmark-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.bookmark-page {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--reader-gold);
}

.bookmark-chapter {
    font-size: 0.75rem;
    color: var(--reader-text-tertiary);
}

.bookmark-remove {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: transparent;
    border: none;
    color: var(--reader-text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    line-height: 1;
    transition: all var(--transition-fast) var(--ease-out);
    opacity: 0;
}

.bookmark-item:hover .bookmark-remove {
    opacity: 1;
}

.bookmark-remove:hover {
    background: rgba(255, 59, 48, 0.2);
    color: #ff3b30;
}

.bookmarks-empty {
    text-align: center;
    padding: var(--space-lg);
    color: var(--reader-text-tertiary);
    font-size: 0.85rem;
}

/* ============================================
   SEARCH RESULTS MODAL
   ============================================ */

.search-results-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal) var(--ease-out);
}

.search-results-modal.visible {
    opacity: 1;
    visibility: visible;
}

.search-results-content {
    background: var(--reader-bg-panel);
    border: 1px solid var(--reader-border);
    border-radius: 16px;
    width: 90%;
    max-width: 600px;
    max-height: 70vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transform: translateY(20px);
    transition: transform var(--transition-normal) var(--ease-out);
}

.search-results-modal.visible .search-results-content {
    transform: translateY(0);
}

.search-results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--reader-border);
}

.search-results-header h3 {
    margin: 0;
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--reader-gold);
}

.search-results-close {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: transparent;
    border: 1px solid var(--reader-border);
    color: var(--reader-text-secondary);
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast) var(--ease-out);
}

.search-results-close:hover {
    background: var(--reader-bg-card);
    color: var(--reader-text);
}

.search-results-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
}

.search-result-item {
    padding: var(--space-md);
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    margin-bottom: var(--space-sm);
    cursor: pointer;
    transition: all var(--transition-fast) var(--ease-out);
}

.search-result-item:hover {
    background: var(--reader-bg-secondary);
    border-color: var(--reader-gold-dim);
}

.search-result-page {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--reader-gold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-xs);
}

.search-result-snippet {
    font-size: 0.85rem;
    color: var(--reader-text-secondary);
    line-height: 1.5;
}

.search-result-snippet mark {
    background: rgba(201, 169, 98, 0.3);
    color: var(--reader-gold);
    padding: 0 2px;
    border-radius: 2px;
}

.search-result-header {
    display: flex;
    gap: var(--space-sm);
    align-items: baseline;
    margin-bottom: var(--space-xs);
}

.search-result-chapter {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--reader-gold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.search-result-title {
    font-size: 0.85rem;
    color: var(--reader-text);
    font-weight: 500;
}

.search-result-item.selected {
    border-color: var(--reader-gold);
    background: rgba(201, 169, 98, 0.1);
}

.search-no-results {
    text-align: center;
    padding: var(--space-xl);
    color: var(--reader-text-tertiary);
}

.search-no-results p {
    margin: 0;
}

/* ============================================
   VOLUME TITLE (replaces tabs)
   ============================================ */

.volume-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--reader-gold);
    font-weight: 600;
    padding: var(--space-sm) var(--space-md);
    background: var(--reader-bg-card);
    border-radius: 8px;
}

.volume-title .vol-indicator {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--reader-text-tertiary);
}

/* Hide volume switcher */
.volume-switcher {
    display: none !important;
}

/* ============================================
   LAYOUT BUTTONS
   ============================================ */

.layout-buttons {
    display: flex;
    gap: var(--space-sm);
}

.layout-btn {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 6px;
    color: var(--reader-text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast) var(--ease-out);
}

.layout-btn:hover {
    background: var(--reader-bg-secondary);
    color: var(--reader-text);
}

.layout-btn.active {
    background: var(--reader-gold);
    border-color: var(--reader-gold);
    color: var(--reader-bg);
}

/* ============================================
   DEFINITIONS LIST STYLES
   ============================================ */

.definition-item {
    padding: var(--space-sm) var(--space-md);
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    margin-bottom: var(--space-sm);
}

.definition-term {
    font-weight: 600;
    color: var(--reader-gold);
    font-size: 0.85rem;
    margin-bottom: var(--space-xs);
}

.definition-text {
    font-size: 0.8rem;
    color: var(--reader-text-secondary);
    line-height: 1.4;
    margin: 0;
}

/* ============================================
   TOPBAR UPGRADE & ACCOUNT
   ============================================ */

.topbar-upgrade {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    background: linear-gradient(135deg, var(--reader-gold), #d4af37);
    color: var(--reader-bg);
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast) var(--ease-out);
}

.topbar-upgrade svg {
    width: 14px;
    height: 14px;
}

.topbar-upgrade:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(201, 169, 98, 0.4);
}

.topbar-account {
    position: relative;
}

.topbar-account-btn {
    border-radius: 50%;
}

.topbar-account-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 200px;
    background: var(--reader-bg-panel);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast) var(--ease-out);
    z-index: 1000;
}

.topbar-account:hover .topbar-account-dropdown,
.topbar-account-dropdown.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.topbar-account-dropdown .account-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    color: var(--reader-text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: all var(--transition-fast) var(--ease-out);
}

.topbar-account-dropdown .account-link:first-child {
    border-radius: 8px 8px 0 0;
}

.topbar-account-dropdown .account-link:last-child {
    border-radius: 0 0 8px 8px;
}

.topbar-account-dropdown .account-link:hover {
    background: var(--reader-bg-card);
    color: var(--reader-gold);
}

.topbar-account-dropdown .account-link svg {
    width: 16px;
    height: 16px;
    opacity: 0.7;
}

/* ============================================
   CONTEXTUAL INTELLIGENCE PANEL (From This Chapter)
   ============================================ */

.companion-contextual {
    background: linear-gradient(180deg, rgba(201, 169, 98, 0.08) 0%, transparent 100%);
    border-radius: 12px;
    padding: var(--space-md);
    margin-bottom: var(--space-md);
    border: 1px solid var(--reader-gold-dim);
}

.companion-contextual .companion-section-title {
    color: var(--reader-gold);
    font-size: 0.9rem;
    letter-spacing: 0.05em;
}

.contextual-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.contextual-btn {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--reader-bg-card);
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    text-decoration: none;
    transition: all var(--transition-fast) var(--ease-out);
    cursor: pointer;
}

.contextual-btn:hover {
    background: var(--reader-bg-secondary);
    border-color: var(--reader-gold-dim);
    transform: translateX(4px);
}

.contextual-btn[data-requires-auth="true"] {
    opacity: 0.7;
}

.contextual-btn[data-requires-auth="true"]:hover {
    opacity: 1;
}

.contextual-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--reader-bg-panel);
    border-radius: 8px;
    flex-shrink: 0;
}

.contextual-icon svg {
    width: 18px;
    height: 18px;
    color: var(--reader-gold);
}

.contextual-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
    text-align: left;
}

.contextual-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--reader-text);
}

.contextual-desc {
    font-size: 0.75rem;
    color: var(--reader-text-tertiary);
}

.contextual-auth-hint {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    margin-top: var(--space-sm);
    background: rgba(201, 169, 98, 0.1);
    border-radius: 6px;
    font-size: 0.75rem;
    color: var(--reader-gold);
}

.contextual-auth-hint svg {
    width: 14px;
    height: 14px;
    opacity: 0.8;
}

/* Hide auth hint when logged in */
body.logged-in .contextual-auth-hint {
    display: none;
}

body.logged-in .contextual-btn[data-requires-auth="true"] {
    opacity: 1;
}