/* ============================================
   BOOK PAGES STYLING
   From Equations to Capital
   ============================================ */

/* Book Page Base */
.book-page {
    background: var(--bg-primary);
    color: var(--text-primary);
}

/* ============================================
   BOOK HERO
   ============================================ */

.book-hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    border-bottom: 1px solid var(--border-subtle);
}

.book-hero-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: var(--space-3xl);
    align-items: center;
}

@media (max-width: 1024px) {
    .book-hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .book-hero-visual {
        order: -1;
    }
}

.book-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

@media (max-width: 1024px) {
    .book-meta {
        justify-content: center;
    }
}

.book-series {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--text-tertiary);
}

.book-volume-badge {
    background: var(--gold);
    color: var(--text-inverse);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 4px;
    letter-spacing: 0.1em;
}

.book-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.book-subtitle {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--gold);
    font-weight: 500;
    margin-bottom: var(--space-lg);
}

.book-description {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: var(--space-xl);
}

@media (max-width: 1024px) {
    .book-description {
        margin-left: auto;
        margin-right: auto;
    }
}

.book-stats {
    display: flex;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

@media (max-width: 1024px) {
    .book-stats {
        justify-content: center;
    }
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--gold);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.book-actions {
    display: flex;
    gap: var(--space-md);
}

@media (max-width: 1024px) {
    .book-actions {
        justify-content: center;
    }
}

.book-actions .btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
}

/* Book 3D Display */
.book-3d-display {
    perspective: 1000px;
}

.book-cover-large {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 
        0 30px 60px rgba(0, 0, 0, 0.4),
        0 0 40px rgba(201, 169, 98, 0.1);
    transform: rotateY(-5deg) rotateX(2deg);
    transition: transform 0.5s var(--ease-out-expo);
}

.book-3d-display:hover .book-cover-large {
    transform: rotateY(0deg) rotateX(0deg);
}

/* ============================================
   TABLE OF CONTENTS
   ============================================ */

.book-toc {
    padding: var(--space-3xl) 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--space-md);
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: var(--space-2xl);
}

.toc-parts {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
}

.toc-part {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    overflow: hidden;
}

.part-header {
    background: linear-gradient(135deg, rgba(201, 169, 98, 0.1), rgba(201, 169, 98, 0.05));
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.part-number {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--gold);
    letter-spacing: 0.1em;
    padding: 6px 12px;
    background: rgba(201, 169, 98, 0.15);
    border-radius: 4px;
}

.part-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.part-chapters {
    padding: var(--space-md);
}

.chapter-item {
    display: grid;
    grid-template-columns: 60px 1fr auto;
    gap: var(--space-lg);
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    border-radius: 8px;
    transition: all 0.2s ease;
}

.chapter-item:hover {
    background: rgba(201, 169, 98, 0.08);
}

.chapter-number {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gold);
    text-align: center;
}

.chapter-info h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 4px 0;
    color: var(--text-primary);
}

.chapter-info p {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin: 0;
}

.chapter-pages {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    white-space: nowrap;
}

/* ============================================
   COMPANIONS SECTION
   ============================================ */

.book-companions {
    padding: var(--space-3xl) 0;
    background: var(--bg-secondary);
}

.companion-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

@media (max-width: 900px) {
    .companion-grid {
        grid-template-columns: 1fr;
    }
}

.companion-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: var(--space-xl);
    text-align: center;
    transition: all 0.3s ease;
}

.companion-card:hover {
    border-color: var(--gold-dim);
    transform: translateY(-4px);
}

.companion-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(201, 169, 98, 0.1);
    border-radius: 12px;
}

.companion-icon svg {
    width: 28px;
    height: 28px;
    color: var(--gold);
}

.companion-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.companion-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.companion-cta {
    text-align: center;
}

/* ============================================
   BUY SECTION
   ============================================ */

.book-buy {
    padding: var(--space-3xl) 0;
}

.buy-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    max-width: 1000px;
    margin: 0 auto;
}

@media (max-width: 900px) {
    .buy-options {
        grid-template-columns: 1fr;
    }
}

.buy-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: var(--space-xl);
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
}

.buy-card:hover {
    border-color: var(--gold-dim);
}

.buy-card.featured {
    border-color: var(--gold);
    background: linear-gradient(135deg, rgba(201, 169, 98, 0.08), rgba(201, 169, 98, 0.02));
}

.buy-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gold);
    color: var(--text-inverse);
    font-size: 0.65rem;
    font-weight: 700;
    padding: 4px 16px;
    border-radius: 12px;
    letter-spacing: 0.1em;
}

.buy-format {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.buy-price {
    margin-bottom: var(--space-lg);
}

.buy-price .currency {
    font-size: 1.5rem;
    color: var(--gold);
    vertical-align: top;
}

.buy-price .amount {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
}

.buy-features {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--space-xl) 0;
    text-align: left;
}

.buy-features li {
    padding: var(--space-sm) 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-subtle);
    padding-left: var(--space-lg);
    position: relative;
}

.buy-features li:last-child {
    border-bottom: none;
}

.buy-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--gold);
    border-radius: 50%;
}

/* ============================================
   FOOTER (Book Pages)
   ============================================ */

.footer {
    padding: var(--space-2xl) 0;
    border-top: 1px solid var(--border-subtle);
    background: var(--bg-secondary);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
}

.footer-copyright {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}