/* ==========================================================================
   Brains Behind RE - Primary Stylesheet
   Theme: Warm Editorial Cream & Boardroom Navy Blues
   Language: British & Indian English
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens & CSS Variables
   -------------------------------------------------------------------------- */
:root {
    /* Cream & Surface Tones */
    --color-cream-base: #FAF7F2;
    --color-cream-subtle: #F4EFE6;
    --color-cream-card: #FFFFFF;
    --color-cream-border: #E8E1D3;
    --color-cream-border-dark: #D4CBBC;
    --color-cream-hover: #F0EAE0;

    /* Blues & Navies */
    --color-navy-deep: #0D1F33;
    --color-navy-slate: #183B5E;
    --color-navy-muted: #2C4A6F;
    --color-blue-accent: #1D4ED8;
    --color-blue-electric: #2563EB;
    --color-blue-light: #EFF6FF;
    --color-blue-badge-border: #BFDBFE;

    /* Accents & Status */
    --color-gold: #B45309;
    --color-gold-light: #D97706;
    --color-gold-bg: #FEF3C7;
    --color-green-live: #059669;
    --color-green-bg: #D1FAE5;

    /* Text & Ink */
    --color-text-main: #132238;
    --color-text-body: #334155;
    --color-text-muted: #64748B;
    --color-text-light: #94A3B8;

    /* Typography */
    --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Cinzel', serif;
    --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, monospace;

    /* Spacing & Layout */
    --container-max-width: 1200px;
    --section-padding: 96px 24px;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(13, 31, 51, 0.05);
    --shadow-md: 0 4px 14px rgba(13, 31, 51, 0.08);
    --shadow-lg: 0 12px 32px rgba(13, 31, 51, 0.12);
    --shadow-book: -10px 18px 36px rgba(13, 31, 51, 0.22), 0 2px 6px rgba(13, 31, 51, 0.08);
    --shadow-spread: 0 16px 40px rgba(13, 31, 51, 0.15);

    /* Transitions */
    --transition-fast: 0.18s ease;
    --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    background-color: var(--color-cream-base);
    color: var(--color-text-main);
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.65;
    overflow-x: hidden;
}

img, picture {
    display: block;
    max-width: 100%;
    height: auto;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* --------------------------------------------------------------------------
   Site Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(250, 247, 242, 0.94);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-cream-border);
    transition: padding var(--transition-fast), box-shadow var(--transition-fast);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background-color: var(--color-navy-deep);
    color: var(--color-cream-base);
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.5px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(232, 225, 211, 0.4);
}

.brand-name {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-navy-deep);
    letter-spacing: -0.2px;
}

.main-nav .nav-list {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-body);
    padding: 6px 0;
    position: relative;
}

.nav-link:hover {
    color: var(--color-navy-deep);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background-color: var(--color-blue-accent);
    transition: width var(--transition-fast);
}

.nav-link:hover::after {
    width: 100%;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
}

.mobile-toggle span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: var(--color-navy-deep);
    border-radius: 2px;
    transition: var(--transition-fast);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
    padding: 12px 22px;
    transition: all var(--transition-fast);
}

.btn-primary-sm {
    display: inline-flex;
    align-items: center;
    font-size: 0.88rem;
    font-weight: 600;
    background-color: var(--color-navy-deep);
    color: #FFFFFF;
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-primary-sm:hover {
    background-color: var(--color-navy-slate);
    transform: translateY(-1px);
}

.btn-primary {
    background-color: var(--color-navy-deep);
    color: #FFFFFF;
    border: 1px solid var(--color-navy-deep);
    box-shadow: 0 4px 12px rgba(13, 31, 51, 0.15);
}

.btn-primary:hover {
    background-color: var(--color-navy-slate);
    border-color: var(--color-navy-slate);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(13, 31, 51, 0.22);
}

.btn-secondary {
    background-color: var(--color-cream-card);
    color: var(--color-navy-deep);
    border: 1px solid var(--color-cream-border-dark);
}

.btn-secondary:hover {
    background-color: var(--color-cream-subtle);
    border-color: var(--color-navy-slate);
    transform: translateY(-1px);
}

.btn-primary-lg {
    background-color: var(--color-navy-deep);
    color: #FFFFFF;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 14px rgba(13, 31, 51, 0.18);
}

.btn-primary-lg:hover {
    background-color: var(--color-navy-slate);
    transform: translateY(-2px);
}

.btn-outline-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-blue-accent);
    padding: 8px 0;
    transition: gap var(--transition-fast), color var(--transition-fast);
}

.btn-outline-primary:hover {
    color: var(--color-navy-deep);
    gap: 12px;
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
    padding: 84px 0 64px 0;
    background: radial-gradient(circle at 50% 20%, #FFFDF9 0%, var(--color-cream-base) 100%);
    border-bottom: 1px solid var(--color-cream-border);
    text-align: center;
}

.hero-container {
    max-width: 860px;
}

.hero-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--color-blue-light);
    border: 1px solid var(--color-blue-badge-border);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    margin-bottom: 24px;
}

.pill-dot {
    width: 8px;
    height: 8px;
    background-color: var(--color-blue-electric);
    border-radius: 50%;
}

.pill-text {
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.8px;
    color: var(--color-navy-slate);
    text-transform: uppercase;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.2rem, 4.2vw, 3.4rem);
    font-weight: 700;
    line-height: 1.18;
    color: var(--color-navy-deep);
    letter-spacing: -0.5px;
    margin-bottom: 22px;
}

.hero-lead {
    font-size: 1.15rem;
    line-height: 1.7;
    color: var(--color-text-body);
    margin-bottom: 36px;
    max-width: 740px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.hero-badges {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    padding: 20px 0;
    border-top: 1px solid var(--color-cream-border);
    flex-wrap: wrap;
}

.badge-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.badge-number {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-navy-deep);
}

.badge-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-separator {
    width: 1px;
    height: 32px;
    background-color: var(--color-cream-border-dark);
}

/* --------------------------------------------------------------------------
   Section Common Headers
   -------------------------------------------------------------------------- */
.section-header {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 52px auto;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 1.5px;
    color: var(--color-blue-accent);
    text-transform: uppercase;
    margin-bottom: 12px;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 3.2vw, 2.75rem);
    font-weight: 700;
    color: var(--color-navy-deep);
    line-height: 1.22;
    margin-bottom: 14px;
}

.section-subtitle {
    font-size: 1.08rem;
    color: var(--color-text-body);
    line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Flagship Book Section
   -------------------------------------------------------------------------- */
.book-section {
    padding: var(--section-padding);
    background-color: var(--color-cream-base);
}

.book-card-wrapper {
    display: grid;
    grid-template-columns: 460px 1fr;
    gap: 56px;
    background-color: var(--color-cream-card);
    border: 1px solid var(--color-cream-border);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-md);
}

/* Book Visual Column */
.book-visual-col {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.view-tabs {
    display: inline-flex;
    background-color: var(--color-cream-subtle);
    padding: 4px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-cream-border);
    margin-bottom: 28px;
    width: 100%;
}

.view-tab {
    flex: 1;
    text-align: center;
    padding: 8px 12px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.view-tab.active {
    background-color: #FFFFFF;
    color: var(--color-navy-deep);
    box-shadow: 0 1px 4px rgba(13, 31, 51, 0.08);
}

.book-stage {
    position: relative;
    width: 100%;
    min-height: 520px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at center, #F8F5EE 0%, #EDE7DC 100%);
    border-radius: var(--radius-md);
    padding: 32px 20px;
    border: 1px solid var(--color-cream-border);
}

.book-view-item {
    display: none;
    width: 100%;
    height: 100%;
}

.book-view-item.active {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.book-3d-wrap {
    position: relative;
    cursor: pointer;
    max-width: 320px;
    transition: transform var(--transition-normal);
}

.book-3d-wrap:hover {
    transform: translateY(-6px) scale(1.02);
}

.book-cover-img {
    border-radius: 4px 10px 10px 4px;
    box-shadow: var(--shadow-book);
    border: 1px solid rgba(13, 31, 51, 0.2);
}

.book-spread-wrap {
    position: relative;
    cursor: pointer;
    max-width: 100%;
    transition: transform var(--transition-normal);
}

.book-spread-wrap:hover {
    transform: translateY(-4px) scale(1.01);
}

.book-spread-img {
    border-radius: 6px;
    box-shadow: var(--shadow-spread);
    border: 1px solid rgba(13, 31, 51, 0.2);
}

.zoom-cue {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(13, 31, 51, 0.88);
    color: #FFFFFF;
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.76rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
    white-space: nowrap;
}

.book-3d-wrap:hover .zoom-cue,
.book-spread-wrap:hover .zoom-cue {
    opacity: 1;
}

.format-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 24px;
    justify-content: center;
}

.chip {
    font-size: 0.78rem;
    padding: 4px 10px;
    background-color: var(--color-cream-subtle);
    border: 1px solid var(--color-cream-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-body);
}

.chip.font-mono {
    font-family: var(--font-mono);
}

/* Book Info Column */
.book-info-col {
    display: flex;
    flex-direction: column;
}

.author-attribution {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.byline {
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--color-gold);
}

.category-pill {
    font-size: 0.75rem;
    font-weight: 600;
    background-color: var(--color-blue-light);
    color: var(--color-navy-slate);
    border: 1px solid var(--color-blue-badge-border);
    padding: 2px 10px;
    border-radius: var(--radius-full);
}

.book-headline {
    font-family: var(--font-serif);
    font-size: 1.85rem;
    font-weight: 700;
    color: var(--color-navy-deep);
    margin-bottom: 16px;
    line-height: 1.25;
}

.book-prose {
    font-size: 1rem;
    color: var(--color-text-body);
    line-height: 1.7;
    margin-bottom: 28px;
}

.book-prose p {
    margin-bottom: 12px;
}

.playbooks-box {
    background-color: var(--color-cream-subtle);
    border: 1px solid var(--color-cream-border);
    border-radius: var(--radius-md);
    padding: 22px 24px;
    margin-bottom: 32px;
}

.playbooks-title {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-navy-deep);
    margin-bottom: 14px;
}

.playbooks-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.playbooks-list li {
    font-size: 0.92rem;
    color: var(--color-text-body);
    line-height: 1.55;
    position: relative;
    padding-left: 20px;
}

.playbooks-list li::before {
    content: "▪";
    position: absolute;
    left: 0;
    top: -2px;
    color: var(--color-blue-accent);
    font-size: 1.2rem;
}

.purchase-section {
    margin-top: auto;
}

.purchase-heading {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--color-navy-deep);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 14px;
}

.purchase-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.purchase-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background-color: #FFFFFF;
    border: 1px solid var(--color-cream-border-dark);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    transition: all var(--transition-fast);
}

.purchase-card:hover {
    border-color: var(--color-blue-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.purchase-card.primary-purchase {
    border-color: var(--color-navy-slate);
    background: linear-gradient(180deg, #FFFFFF 0%, #F8F5EE 100%);
}

.purchase-card.primary-purchase:hover {
    border-color: var(--color-blue-accent);
    box-shadow: 0 4px 14px rgba(29, 78, 216, 0.12);
}

.purchase-card-icon {
    font-size: 1.6rem;
    flex-shrink: 0;
}

.purchase-card-content {
    flex: 1;
}

.purchase-provider {
    font-size: 0.98rem;
    font-weight: 700;
    color: var(--color-navy-deep);
}

.purchase-details {
    font-size: 0.86rem;
    font-weight: 500;
    color: var(--color-text-body);
}

.purchase-subtext {
    font-size: 0.78rem;
    color: var(--color-text-muted);
}

.btn-retail {
    font-size: 0.86rem;
    font-weight: 700;
    color: var(--color-blue-accent);
    white-space: nowrap;
    padding: 6px 12px;
    border-radius: 4px;
    background-color: var(--color-blue-light);
    border: 1px solid var(--color-blue-badge-border);
}

.purchase-card:hover .btn-retail {
    background-color: var(--color-blue-accent);
    color: #FFFFFF;
    border-color: var(--color-blue-accent);
}

.companion-portal-link {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    background-color: var(--color-cream-subtle);
    border: 1px solid var(--color-cream-border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 0.86rem;
    color: var(--color-text-body);
}

.portal-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
}

.portal-anchor {
    font-weight: 700;
    color: var(--color-blue-accent);
    display: inline-block;
    margin-left: 4px;
}

.portal-anchor:hover {
    text-decoration: underline;
}

/* --------------------------------------------------------------------------
   Digital Products & Toolkits Grid
   -------------------------------------------------------------------------- */
.products-section {
    padding: var(--section-padding);
    background-color: var(--color-cream-subtle);
    border-top: 1px solid var(--color-cream-border);
    border-bottom: 1px solid var(--color-cream-border);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 32px;
}

.product-card {
    display: flex;
    flex-direction: column;
    background-color: var(--color-cream-card);
    border: 1px solid var(--color-cream-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-cream-border-dark);
}

.product-card-media {
    position: relative;
    height: 200px;
    background-color: var(--color-navy-deep);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-card-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.92;
    transition: transform var(--transition-normal);
}

.product-card:hover .product-card-media img {
    transform: scale(1.04);
}

.memo-card-placeholder {
    background: linear-gradient(135deg, #183B5E 0%, #0D1F33 100%);
}

.memo-badge-icon {
    font-size: 3.5rem;
}

.status-badge {
    position: absolute;
    top: 14px;
    right: 14px;
    font-size: 0.74rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    backdrop-filter: blur(8px);
}

.status-badge.available {
    background-color: rgba(5, 150, 105, 0.9);
    color: #FFFFFF;
}

.status-badge.coming-soon {
    background-color: rgba(24, 59, 94, 0.92);
    color: #FFFFFF;
    border: 1px solid rgba(147, 197, 253, 0.35);
}

.status-badge.complimentary {
    background-color: rgba(180, 83, 9, 0.9);
    color: #FFFFFF;
}

.product-card-body {
    padding: 28px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.product-category {
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 1.2px;
    color: var(--color-blue-accent);
    text-transform: uppercase;
    margin-bottom: 8px;
}

.product-title {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-navy-deep);
    line-height: 1.3;
    margin-bottom: 12px;
}

.product-title a:hover {
    color: var(--color-blue-accent);
}

.product-desc {
    font-size: 0.92rem;
    color: var(--color-text-body);
    line-height: 1.6;
    margin-bottom: 18px;
}

.product-features {
    list-style: none;
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.product-features li {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.product-card-footer {
    margin-top: auto;
    border-top: 1px solid var(--color-cream-border);
    padding-top: 16px;
    display: flex;
    align-items: center;
}

.coming-soon-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-navy-slate);
    background-color: var(--color-cream-subtle);
    border: 1px solid var(--color-cream-border-dark);
    padding: 7px 14px;
    border-radius: var(--radius-sm);
    letter-spacing: 0.2px;
}

/* --------------------------------------------------------------------------
   Executive Newsletter Section
   -------------------------------------------------------------------------- */
.newsletter-section {
    padding: var(--section-padding);
    background-color: var(--color-cream-base);
    border-bottom: 1px solid var(--color-cream-border);
}

.newsletter-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 48px;
    background-color: var(--color-cream-card);
    border: 1px solid var(--color-cream-border);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.newsletter-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-cream-border-dark);
}

.newsletter-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 1.2px;
    color: #0A66C2;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.newsletter-title {
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 2.5vw, 2.3rem);
    font-weight: 700;
    color: var(--color-navy-deep);
    line-height: 1.25;
    margin-bottom: 14px;
}

.newsletter-desc {
    font-size: 1.02rem;
    color: var(--color-text-body);
    line-height: 1.7;
    margin-bottom: 20px;
    max-width: 680px;
}

.newsletter-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 8px;
}

.topic-tag {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-navy-slate);
    background-color: var(--color-cream-subtle);
    border: 1px solid var(--color-cream-border);
    padding: 4px 12px;
    border-radius: var(--radius-full);
}

.newsletter-action {
    flex-shrink: 0;
}

.btn-linkedin {
    background-color: #0A66C2;
    color: #FFFFFF;
    border: 1px solid #0A66C2;
    box-shadow: 0 4px 12px rgba(10, 102, 194, 0.2);
}

.btn-linkedin:hover {
    background-color: #004182;
    border-color: #004182;
    color: #FFFFFF;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(10, 102, 194, 0.3);
}

.text-link {
    color: var(--color-blue-accent);
    text-decoration: underline;
    text-underline-offset: 3px;
    font-weight: 600;
}

.text-link:hover {
    color: var(--color-navy-deep);
}

.author-link-highlight {
    color: #0A66C2;
}

.author-link-highlight:hover {
    color: #004182;
}

/* --------------------------------------------------------------------------
   About the Author Section
   -------------------------------------------------------------------------- */
.author-section {
    padding: var(--section-padding);
    background-color: var(--color-cream-base);
}

.author-card {
    background-color: var(--color-cream-card);
    border: 1px solid var(--color-cream-border);
    border-radius: var(--radius-lg);
    padding: 48px;
    max-width: 900px;
    margin: 0 auto;
    box-shadow: var(--shadow-sm);
}

.author-header {
    margin-bottom: 22px;
}

.author-name {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--color-navy-deep);
    margin: 8px 0 4px 0;
}

.author-role {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-navy-slate);
}

.author-bio {
    font-size: 1.02rem;
    color: var(--color-text-body);
    line-height: 1.75;
    margin-bottom: 32px;
}

.author-bio p {
    margin-bottom: 14px;
}

.author-meta-links {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
    border-top: 1px solid var(--color-cream-border);
    padding-top: 24px;
}

.author-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--color-navy-slate);
    transition: color var(--transition-fast);
}

.author-link:hover {
    color: var(--color-blue-accent);
}

/* --------------------------------------------------------------------------
   Institutional Enquiries Banner
   -------------------------------------------------------------------------- */
.enquiry-section {
    padding: 0 0 var(--section-padding) 0;
    background-color: var(--color-cream-base);
}

.enquiry-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 36px;
    background: linear-gradient(135deg, var(--color-navy-deep) 0%, #183B5E 100%);
    color: #FFFFFF;
    border-radius: var(--radius-lg);
    padding: 48px 56px;
    box-shadow: var(--shadow-lg);
}

.enquiry-content {
    max-width: 640px;
}

.enquiry-tag {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 1.5px;
    color: #93C5FD;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.enquiry-title {
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 2.5vw, 2.2rem);
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.25;
}

.enquiry-text {
    font-size: 1rem;
    color: #E2E8F0;
    line-height: 1.6;
}

.enquiry-action {
    flex-shrink: 0;
}

.enquiry-action .btn-primary-lg {
    background-color: #FFFFFF;
    color: var(--color-navy-deep);
}

.enquiry-action .btn-primary-lg:hover {
    background-color: var(--color-cream-subtle);
    color: var(--color-navy-deep);
}

/* --------------------------------------------------------------------------
   Site Footer
   -------------------------------------------------------------------------- */
.site-footer {
    background-color: #081422;
    color: #94A3B8;
    padding: 64px 0 32px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    gap: 64px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.footer-left {
    max-width: 380px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.brand-badge-sm {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: #183B5E;
    color: #FFFFFF;
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
}

.footer-brand-name {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 700;
    color: #FFFFFF;
}

.footer-tagline {
    font-size: 0.92rem;
    line-height: 1.6;
    margin-bottom: 18px;
    color: #CBD5E1;
}

.footer-domains span {
    font-size: 0.82rem;
    color: #64748B;
}

.footer-domains code {
    font-family: var(--font-mono);
    color: #93C5FD;
    background-color: rgba(255, 255, 255, 0.05);
    padding: 2px 6px;
    border-radius: 4px;
}

.footer-right {
    display: flex;
    gap: 48px;
    flex-wrap: wrap;
}

.footer-nav-col h4 {
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: #FFFFFF;
    margin-bottom: 16px;
}

.footer-nav-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-nav-col a {
    font-size: 0.88rem;
    color: #94A3B8;
}

.footer-nav-col a:hover {
    color: #FFFFFF;
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 24px;
    font-size: 0.84rem;
    color: #64748B;
    flex-wrap: wrap;
    gap: 16px;
}

.back-to-top {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #94A3B8;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.back-to-top:hover {
    color: #FFFFFF;
}

/* --------------------------------------------------------------------------
   Lightbox Modal
   -------------------------------------------------------------------------- */
.lightbox-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.lightbox-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(13, 31, 51, 0.88);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.lightbox-content {
    position: relative;
    z-index: 10;
    max-width: 90vw;
    max-height: 92vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: zoomModal 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes zoomModal {
    from { opacity: 0; transform: scale(0.92); }
    to { opacity: 1; transform: scale(1); }
}

.lightbox-image-wrap {
    max-width: 100%;
    max-height: 82vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-image-wrap img {
    max-width: 100%;
    max-height: 82vh;
    border-radius: 8px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    object-fit: contain;
}

.lightbox-caption {
    margin-top: 12px;
    color: #E2E8F0;
    font-size: 0.95rem;
    font-weight: 600;
    text-align: center;
}

.lightbox-close {
    position: absolute;
    top: -44px;
    right: 0;
    color: #FFFFFF;
    font-size: 2.2rem;
    line-height: 1;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
}

.lightbox-close:hover {
    transform: scale(1.15);
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .book-card-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
        padding: 36px;
    }

    .book-visual-col {
        max-width: 520px;
        margin: 0 auto;
    }

    .enquiry-card {
        flex-direction: column;
        align-items: flex-start;
        padding: 40px 32px;
    }

    .newsletter-card {
        flex-direction: column;
        align-items: flex-start;
        padding: 36px 32px;
        gap: 28px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 64px 20px;
    }

    .header-container {
        height: 68px;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        width: 100%;
        background-color: var(--color-cream-base);
        border-bottom: 1px solid var(--color-cream-border);
        box-shadow: var(--shadow-md);
        padding: 20px;
    }

    .main-nav.mobile-active {
        display: block;
    }

    .main-nav .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .mobile-toggle {
        display: flex;
    }

    .header-actions .btn-primary-sm {
        display: none;
    }

    .hero-section {
        padding: 56px 0 48px 0;
    }

    .hero-badges {
        gap: 20px;
    }

    .badge-separator {
        display: none;
    }

    .book-card-wrapper {
        padding: 24px 20px;
    }

    .book-stage {
        min-height: 420px;
        padding: 24px 12px;
    }

    .book-3d-wrap {
        max-width: 250px;
    }

    .author-card {
        padding: 28px 20px;
    }

    .footer-container {
        flex-direction: column;
        gap: 40px;
    }

    .footer-right {
        gap: 32px;
        flex-direction: column;
    }
}