/** * Copyright (c) 2026 DNA Genics, S.L. All rights reserved.
 * 
 * Admixture Calculators Product Page - Cinematic Design
 * Multi-lens genetic ancestry analysis with narrative flow
 */

/* ========================================
   CSS Custom Properties
   ======================================== */
:root {
    /* Primary Colors - Admixture Theme */
    --ac-primary: #237465;
    --ac-primary-dark: #1a574c;
    --ac-primary-darker: #134238;
    --ac-secondary: #C2D053;
    --ac-secondary-dark: #9AAA42;
    --ac-accent: #9CD053;
    --ac-accent-gold: #d4af37;
    
    /* Neutral Colors */
    --ac-dark: #1a1a2e;
    --ac-dark-soft: #2d2d44;
    --ac-text: #333344;
    --ac-text-muted: #64748b;
    --ac-light: #f8faf8;
    --ac-white: #ffffff;
    --ac-border: rgba(15, 23, 42, 0.08);
    
    /* Typography */
    --ac-font-serif: 'Cormorant Garamond', 'Georgia', serif;
    --ac-font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Shadows */
    --ac-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --ac-shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
    --ac-shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
    --ac-shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.16);
    --ac-shadow-glow: 0 8px 32px rgba(35, 116, 101, 0.25);
    
    /* Borders */
    --ac-radius-sm: 8px;
    --ac-radius-md: 16px;
    --ac-radius-lg: 24px;
    --ac-radius-xl: 32px;
    
    /* Transitions */
    --ac-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --ac-transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   Base & Typography
   ======================================== */
.ac-main {
    font-family: var(--ac-font-sans);
    color: var(--ac-text);
    background: var(--ac-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.ac-main h1,
.ac-main h2,
.ac-main h3,
.ac-main h4 {
    font-family: var(--ac-font-serif);
    font-weight: 600;
    color: var(--ac-dark);
    line-height: 1.2;
}

/* ========================================
   Accessibility
   ======================================== */
.ac-skip-link {
    position: absolute;
    left: -999px;
    top: 10px;
    z-index: 2000;
    background: var(--ac-white);
    color: var(--ac-dark);
    padding: 12px 16px;
    border-radius: var(--ac-radius-sm);
    box-shadow: var(--ac-shadow-lg);
    text-decoration: none;
    font-weight: 600;
}

.ac-skip-link:focus {
    left: 10px;
    outline: 3px solid var(--ac-primary);
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ========================================
   Scroll Progress Bar
   ======================================== */
.ac-scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--ac-primary) 0%, var(--ac-secondary) 100%);
    width: 0%;
    z-index: 9999;
    transition: width 0.1s ease-out;
}

/* ========================================
   Page Navigation Dots
   ======================================== */
.ac-page-nav {
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1200;
    display: flex;
    flex-direction: column;
    gap: 12px;
    opacity: 0;
    visibility: hidden;
    transition: var(--ac-transition);
}

.ac-page-nav.visible {
    opacity: 1;
    visibility: visible;
}

.ac-nav-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    border: 2px solid rgba(255, 255, 255, 0.8);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    position: relative;
    transition: var(--ac-transition);
    cursor: pointer;
}

.ac-nav-dot:hover,
.ac-nav-dot:focus {
    transform: scale(1.2);
    background: rgba(35, 116, 101, 0.6);
    outline: none;
}

.ac-nav-dot.active {
    background: linear-gradient(135deg, var(--ac-primary) 0%, var(--ac-secondary) 100%);
    transform: scale(1.2);
}

.ac-nav-dot::after {
    content: attr(data-tooltip);
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    white-space: nowrap;
    background: rgba(26, 26, 46, 0.95);
    color: var(--ac-white);
    padding: 8px 14px;
    border-radius: var(--ac-radius-sm);
    font-size: 0.8rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.ac-nav-dot:hover::after,
.ac-nav-dot:focus::after {
    opacity: 1;
}

@media (max-width: 991px) {
    .ac-page-nav {
        display: none;
    }
}

/* ========================================
   Back to Top Button
   ======================================== */
.ac-back-to-top {
    position: fixed;
    bottom: 100px;
    right: 24px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--ac-primary) 0%, var(--ac-secondary) 100%);
    color: var(--ac-white);
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--ac-transition);
    z-index: 1100;
    box-shadow: var(--ac-shadow-lg);
}

.ac-back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.ac-back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--ac-shadow-glow);
}

/* ========================================
   HERO SECTION - Cinematic Full Viewport
   ======================================== */
.ac-hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 20px 80px;
    overflow: hidden;
}

.ac-hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #134238 50%, #1a574c 100%);
    background-attachment: fixed;
}

.ac-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(26, 26, 46, 0.85) 0%,
        rgba(35, 116, 101, 0.65) 50%,
        rgba(26, 26, 46, 0.9) 100%
    );
}

.ac-hero-threads {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(2px 2px at 20% 30%, rgba(194, 208, 83, 0.4) 50%, transparent 50%),
        radial-gradient(2px 2px at 40% 70%, rgba(255, 255, 255, 0.3) 50%, transparent 50%),
        radial-gradient(2px 2px at 60% 40%, rgba(156, 208, 83, 0.3) 50%, transparent 50%),
        radial-gradient(2px 2px at 80% 80%, rgba(255, 255, 255, 0.2) 50%, transparent 50%);
    background-size: 200px 200px;
    animation: threadFloat 20s linear infinite;
}

@keyframes threadFloat {
    0% { transform: translateY(0); }
    100% { transform: translateY(-200px); }
}

.ac-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    color: var(--ac-white);
}

.ac-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(194, 208, 83, 0.2);
    border: 1px solid rgba(194, 208, 83, 0.4);
    color: var(--ac-secondary);
    padding: 10px 24px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

.ac-hero-title {
    font-size: clamp(2.5rem, 7vw, 5rem);
    font-weight: 700;
    margin-bottom: 24px;
    line-height: 1.1;
}

.ac-title-line {
    display: block;
    color: rgba(255, 255, 255, 0.9);
}

.ac-title-accent {
    display: block;
    background: linear-gradient(135deg, var(--ac-secondary) 0%, #e0e894 50%, var(--ac-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.ac-hero-lead {
    font-size: clamp(1rem, 2.5vw, 1.35rem);
    line-height: 1.7;
    margin-bottom: 32px;
    color: rgba(255, 255, 255, 0.85);
    max-width: 750px;
    margin-left: auto;
    margin-right: auto;
}

/* Hero Stats */
.ac-hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.ac-stat-item {
    text-align: center;
}

.ac-stat-value {
    display: block;
    font-family: var(--ac-font-serif);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--ac-secondary);
    line-height: 1;
    margin-bottom: 4px;
}

.ac-stat-label {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.ac-stat-divider {
    width: 1px;
    height: 50px;
    background: rgba(255, 255, 255, 0.3);
}

@media (max-width: 576px) {
    .ac-stat-divider {
        display: none;
    }
    .ac-hero-stats {
        gap: 16px;
    }
}

/* Hero Price */
.ac-hero-price {
    margin-bottom: 32px;
}

.ac-price-tag {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    padding: 16px 32px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--ac-radius-lg);
    backdrop-filter: blur(10px);
}

.ac-price-label {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.ac-price-amount {
    font-family: var(--ac-font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ac-secondary);
}

.ac-price-note {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
}

/* Hero CTA */
.ac-hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.ac-btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    background: linear-gradient(135deg, var(--ac-primary) 0%, var(--ac-primary-dark) 100%);
    color: var(--ac-white);
    font-weight: 600;
    font-size: 1rem;
    border-radius: var(--ac-radius-md);
    text-decoration: none;
    transition: var(--ac-transition);
    box-shadow: var(--ac-shadow-lg);
    border: none;
    cursor: pointer;
}

.ac-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--ac-shadow-glow);
    color: var(--ac-white);
    text-decoration: none;
}

.ac-btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    background: transparent;
    color: var(--ac-white);
    font-weight: 600;
    font-size: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-radius: var(--ac-radius-md);
    text-decoration: none;
    transition: var(--ac-transition);
    cursor: pointer;
}

.ac-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.6);
    color: var(--ac-white);
    text-decoration: none;
}

.ac-btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: transparent;
    color: var(--ac-primary);
    font-weight: 600;
    border: 2px solid var(--ac-primary);
    border-radius: var(--ac-radius-md);
    text-decoration: none;
    transition: var(--ac-transition);
    cursor: pointer;
}

.ac-btn-outline:hover {
    background: var(--ac-primary);
    color: var(--ac-white);
    text-decoration: none;
}

.ac-btn-primary-large {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 20px 40px;
    background: linear-gradient(135deg, var(--ac-primary) 0%, var(--ac-primary-dark) 100%);
    color: var(--ac-white);
    font-weight: 700;
    font-size: 1.15rem;
    border-radius: var(--ac-radius-lg);
    text-decoration: none;
    transition: var(--ac-transition);
    box-shadow: var(--ac-shadow-lg);
    border: none;
    cursor: pointer;
}

.ac-btn-primary-large:hover {
    transform: translateY(-3px);
    box-shadow: var(--ac-shadow-glow);
    color: var(--ac-white);
    text-decoration: none;
}

/* Trust Badges */
.ac-trust-badges {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.ac-trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
}

.ac-trust-item i {
    color: var(--ac-secondary);
}

/* Scroll Indicator */
.ac-scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: var(--ac-transition);
    animation: scrollBounce 2s infinite;
}

.ac-scroll-indicator:hover {
    color: var(--ac-secondary);
}

.ac-scroll-text {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ========================================
   ANIMATIONS
   ======================================== */
.animate-fade-in {
    opacity: 0;
    animation: fadeIn 0.8s ease forwards;
}

.animate-fade-in-up {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }
.delay-4 { animation-delay: 0.8s; }

@keyframes fadeIn {
    to { opacity: 1; }
}

@keyframes fadeInUp {
    to { 
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   SECTION COMMON STYLES
   ======================================== */
.ac-section {
    padding: 100px 0;
    position: relative;
}

.ac-chapter-header {
    text-align: center;
    margin-bottom: 60px;
}

.ac-chapter-number {
    display: inline-block;
    font-family: var(--ac-font-serif);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--ac-primary);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 16px;
    opacity: 0.8;
}

.ac-section-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--ac-dark);
}

.ac-section-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--ac-text-muted);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ========================================
   CHAPTER I: WHAT ARE ADMIXTURE CALCULATORS
   ======================================== */
.ac-what-are {
    background: linear-gradient(180deg, var(--ac-white) 0%, #f8faf8 100%);
}

.ac-pillars-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-bottom: 60px;
}

.ac-pillar-card {
    background: var(--ac-white);
    padding: 40px 32px;
    border-radius: var(--ac-radius-lg);
    text-align: center;
    box-shadow: var(--ac-shadow-md);
    transition: var(--ac-transition);
    border: 1px solid var(--ac-border);
}

.ac-pillar-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--ac-shadow-lg);
}

.ac-pillar-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(35, 116, 101, 0.1) 0%, rgba(194, 208, 83, 0.1) 100%);
    border-radius: 50%;
    font-size: 2rem;
    color: var(--ac-primary);
}

.ac-pillar-card h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.ac-pillar-card p {
    color: var(--ac-text-muted);
    line-height: 1.7;
}

/* Insight Block */
.ac-insight-block {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 32px 40px;
    background: linear-gradient(135deg, rgba(35, 116, 101, 0.08) 0%, rgba(194, 208, 83, 0.08) 100%);
    border-radius: var(--ac-radius-lg);
    border-left: 4px solid var(--ac-primary);
    margin-bottom: 60px;
}

.ac-insight-icon {
    font-size: 2.5rem;
    color: var(--ac-primary);
    flex-shrink: 0;
}

.ac-insight-quote {
    font-family: var(--ac-font-serif);
    font-size: 1.35rem;
    font-style: italic;
    color: var(--ac-dark);
    margin: 0;
    line-height: 1.6;
}

.ac-insight-quote em {
    color: var(--ac-primary);
    font-style: normal;
    font-weight: 600;
}

@media (max-width: 576px) {
    .ac-insight-block {
        flex-direction: column;
        text-align: center;
        padding: 24px;
    }
}

/* Lens Visual */
.ac-lens-visual {
    text-align: center;
}

.ac-lens-container {
    position: relative;
    width: 300px;
    height: 300px;
    margin: 0 auto 24px;
}

.ac-lens-layer {
    position: absolute;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--ac-transition);
    border: 2px dashed;
}

.ac-lens-layer span {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    background: var(--ac-white);
    padding: 4px 12px;
    border-radius: 20px;
}

.ac-lens-ancient {
    width: 300px;
    height: 300px;
    top: 0;
    left: 0;
    border-color: #8B7355;
    background: rgba(139, 115, 85, 0.08);
}

.ac-lens-ancient span { color: #8B7355; }

.ac-lens-regional {
    width: 220px;
    height: 220px;
    top: 40px;
    left: 40px;
    border-color: var(--ac-primary);
    background: rgba(35, 116, 101, 0.1);
}

.ac-lens-regional span { color: var(--ac-primary); }

.ac-lens-modern {
    width: 140px;
    height: 140px;
    top: 80px;
    left: 80px;
    border-color: var(--ac-secondary-dark);
    background: rgba(194, 208, 83, 0.12);
}

.ac-lens-modern span { color: var(--ac-secondary-dark); }

.ac-lens-center {
    position: absolute;
    width: 80px;
    height: 80px;
    top: 110px;
    left: 110px;
    background: linear-gradient(135deg, var(--ac-primary) 0%, var(--ac-primary-dark) 100%);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--ac-white);
    box-shadow: var(--ac-shadow-lg);
}

.ac-lens-center i {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.ac-lens-center span {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
}

.ac-lens-caption {
    color: var(--ac-text-muted);
    font-size: 0.95rem;
}

/* ========================================
   CHAPTER II: WHY MULTIPLE CALCULATORS
   ======================================== */
.ac-why-multiple {
    background: var(--ac-white);
}

.ac-metaphor-block {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    padding: 40px;
    background: linear-gradient(135deg, var(--ac-dark) 0%, #2d2d44 100%);
    border-radius: var(--ac-radius-lg);
    margin-bottom: 60px;
}

.ac-metaphor-icon {
    font-size: 3rem;
    color: var(--ac-secondary);
}

.ac-metaphor-text {
    font-family: var(--ac-font-serif);
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    color: var(--ac-white);
    font-style: italic;
    margin: 0;
    max-width: 600px;
}

@media (max-width: 576px) {
    .ac-metaphor-block {
        flex-direction: column;
        text-align: center;
        padding: 32px 24px;
    }
}

.ac-perspectives-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-bottom: 60px;
}

.ac-perspective-card {
    background: var(--ac-white);
    padding: 32px;
    border-radius: var(--ac-radius-lg);
    box-shadow: var(--ac-shadow-md);
    border: 1px solid var(--ac-border);
    transition: var(--ac-transition);
}

.ac-perspective-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--ac-shadow-lg);
}

.ac-perspective-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.ac-perspective-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 1.5rem;
    color: var(--ac-white);
}

.ac-perspective-global .ac-perspective-icon {
    background: linear-gradient(135deg, #5B8DEE 0%, #3366CC 100%);
}

.ac-perspective-regional .ac-perspective-icon {
    background: linear-gradient(135deg, var(--ac-primary) 0%, var(--ac-primary-dark) 100%);
}

.ac-perspective-temporal .ac-perspective-icon {
    background: linear-gradient(135deg, #8B7355 0%, #6B5344 100%);
}

.ac-perspective-card h3 {
    font-size: 1.25rem;
    margin: 0;
}

.ac-perspective-card p {
    color: var(--ac-text-muted);
    line-height: 1.7;
    margin-bottom: 16px;
}

.ac-perspective-example {
    background: rgba(35, 116, 101, 0.06);
    padding: 12px 16px;
    border-radius: var(--ac-radius-sm);
    font-size: 0.9rem;
}

.ac-example-label {
    font-weight: 600;
    color: var(--ac-primary);
    margin-right: 8px;
}

/* Convergence Block - Multi-Lens Infographic */
.ac-convergence-block {
    text-align: center;
    padding: 48px 24px;
    background: linear-gradient(135deg, rgba(35, 116, 101, 0.05) 0%, rgba(194, 208, 83, 0.05) 100%);
    border-radius: var(--ac-radius-lg);
}

.ac-infographic {
    max-width: 1000px;
    margin: 0 auto 32px;
}

/* Three Lens Cards Container */
.ac-lens-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 24px;
    align-items: stretch;
}

/* Individual Lens Card */
.ac-lens-card {
    background: var(--ac-white);
    border-radius: var(--ac-radius-md);
    padding: 24px 20px;
    box-shadow: var(--ac-shadow-sm);
    border: 1px solid var(--ac-border);
    transition: var(--ac-transition);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.ac-lens-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
}

.ac-lens-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--ac-shadow-md);
}

/* Lens Color Variants */
.ac-lens-ancient::before {
    background: linear-gradient(90deg, #d4af37 0%, #f4d03f 100%);
}

.ac-lens-ancient .ac-lens-icon {
    background: linear-gradient(135deg, #d4af37 0%, #f4d03f 100%);
}

.ac-lens-regional::before {
    background: linear-gradient(90deg, var(--ac-primary) 0%, #2d9a84 100%);
}

.ac-lens-regional .ac-lens-icon {
    background: linear-gradient(135deg, var(--ac-primary) 0%, #2d9a84 100%);
}

.ac-lens-modern::before {
    background: linear-gradient(90deg, #5B8DEE 0%, #7aa2f7 100%);
}

.ac-lens-modern .ac-lens-icon {
    background: linear-gradient(135deg, #5B8DEE 0%, #7aa2f7 100%);
}

/* Lens Icon */
.ac-lens-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    color: var(--ac-white);
    font-size: 1.25rem;
    box-shadow: var(--ac-shadow-sm);
}

/* Lens Title */
.ac-lens-title {
    font-family: var(--ac-font-serif);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--ac-dark);
    margin-bottom: 16px;
}

/* Lens Results */
.ac-lens-results {
    margin-bottom: 16px;
}

.ac-lens-result {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--ac-border);
}

.ac-lens-result:last-child {
    border-bottom: none;
}

.ac-result-label {
    font-size: 0.85rem;
    color: var(--ac-text-muted);
    text-align: left;
}

.ac-result-value {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--ac-dark);
}

/* Lens Description */
.ac-lens-description {
    font-size: 0.8rem;
    color: var(--ac-text-muted);
    margin: 0;
    margin-top: auto;
    padding-top: 12px;
    font-style: italic;
}

/* Convergence Lines SVG */
.ac-convergence-lines {
    height: 50px;
    margin: 0 auto 16px;
    width: 100%;
    max-width: 800px;
}

.ac-convergence-lines svg {
    width: 100%;
    height: 100%;
}

.ac-line {
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
}

.ac-line-1 {
    stroke: #d4af37;
}

.ac-line-2 {
    stroke: var(--ac-primary);
}

.ac-line-3 {
    stroke: #5B8DEE;
}

/* Convergence Summary */
.ac-convergence-summary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    background: linear-gradient(135deg, var(--ac-primary) 0%, var(--ac-primary-dark) 100%);
    padding: 20px 32px;
    border-radius: var(--ac-radius-md);
    max-width: 500px;
    margin: 0 auto 32px;
    box-shadow: var(--ac-shadow-glow);
}

.ac-summary-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ac-white);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.ac-summary-content {
    text-align: left;
}

.ac-summary-title {
    font-family: var(--ac-font-serif);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--ac-white);
    margin: 0 0 4px 0;
}

.ac-summary-text {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.85);
    margin: 0;
}

.ac-convergence-text {
    font-family: var(--ac-font-serif);
    font-size: 1.2rem;
    color: var(--ac-dark);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Responsive: Tablet */
@media (max-width: 900px) {
    .ac-lens-cards {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }
    
    .ac-lens-card {
        padding: 20px 16px;
    }
    
    .ac-lens-title {
        font-size: 1rem;
    }
    
    .ac-result-label {
        font-size: 0.8rem;
    }
    
    .ac-result-value {
        font-size: 0.85rem;
    }
}

/* Responsive: Mobile */
@media (max-width: 768px) {
    .ac-convergence-block {
        padding: 32px 16px;
    }
    
    .ac-lens-cards {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .ac-lens-card {
        padding: 20px;
    }
    
    .ac-lens-results {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .ac-lens-result {
        flex: 1 1 calc(50% - 8px);
        min-width: 120px;
        border-bottom: none;
        background: var(--ac-light);
        padding: 8px 12px;
        border-radius: var(--ac-radius-sm);
        flex-direction: column;
        align-items: flex-start;
    }
    
    .ac-convergence-lines {
        display: none;
    }
    
    .ac-convergence-summary {
        flex-direction: column;
        text-align: center;
        padding: 24px;
    }
    
    .ac-summary-content {
        text-align: center;
    }
    
    .ac-convergence-text {
        font-size: 1.1rem;
    }
}

/* ========================================
   CHAPTER III: WHAT YOU'LL DISCOVER
   ======================================== */
.ac-discover {
    background: linear-gradient(180deg, #f8faf8 0%, var(--ac-white) 100%);
}

.ac-discovery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.ac-discovery-card {
    background: var(--ac-white);
    padding: 32px;
    border-radius: var(--ac-radius-lg);
    text-align: center;
    box-shadow: var(--ac-shadow-sm);
    border: 1px solid var(--ac-border);
    transition: var(--ac-transition);
}

.ac-discovery-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--ac-shadow-md);
    border-color: var(--ac-primary);
}

.ac-discovery-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--ac-primary) 0%, var(--ac-primary-dark) 100%);
    border-radius: 50%;
    font-size: 1.5rem;
    color: var(--ac-white);
}

.ac-discovery-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.ac-discovery-card p {
    color: var(--ac-text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

/* Discover Insight */
.ac-discover-insight {
    text-align: center;
    margin-bottom: 48px;
}

.ac-discover-insight blockquote {
    font-family: var(--ac-font-serif);
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-weight: 600;
    color: var(--ac-dark);
    margin: 0;
    line-height: 1.4;
}

.ac-quote-mark {
    color: var(--ac-primary);
    opacity: 0.5;
}

/* Sample Preview */
.ac-sample-preview {
    background: var(--ac-white);
    border-radius: var(--ac-radius-lg);
    box-shadow: var(--ac-shadow-md);
    overflow: hidden;
    max-width: 700px;
    margin: 0 auto;
}

.ac-preview-header {
    background: linear-gradient(135deg, var(--ac-primary) 0%, var(--ac-primary-dark) 100%);
    color: var(--ac-white);
    padding: 16px 24px;
}

.ac-preview-header h4 {
    margin: 0;
    font-size: 1rem;
    color: var(--ac-white);
}

.ac-preview-content {
    padding: 24px;
}

.ac-preview-bars {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 16px;
}

.ac-preview-bar {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.ac-bar-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--ac-text);
}

.ac-bar-track {
    height: 28px;
    background: #f0f0f0;
    border-radius: 4px;
    overflow: hidden;
}

.ac-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--ac-primary) 0%, var(--ac-primary-dark) 100%);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 8px;
    color: var(--ac-white);
    font-size: 0.8rem;
    font-weight: 600;
    min-width: 40px;
}

.ac-preview-note {
    font-size: 0.85rem;
    color: var(--ac-text-muted);
    margin: 0;
    font-style: italic;
}

/* ========================================
   CHAPTER IV: HOW IT WORKS
   ======================================== */
.ac-how-it-works {
    background: var(--ac-white);
}

.ac-process-grid {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.ac-process-step {
    flex: 1;
    min-width: 200px;
    max-width: 250px;
    text-align: center;
    padding: 24px;
    background: var(--ac-white);
    border-radius: var(--ac-radius-lg);
    box-shadow: var(--ac-shadow-sm);
    border: 1px solid var(--ac-border);
    position: relative;
}

.ac-step-number {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--ac-secondary) 0%, var(--ac-secondary-dark) 100%);
    color: var(--ac-dark);
    font-weight: 700;
    font-size: 0.9rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ac-step-icon {
    width: 56px;
    height: 56px;
    margin: 16px auto;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(35, 116, 101, 0.1);
    border-radius: 50%;
    font-size: 1.5rem;
    color: var(--ac-primary);
}

.ac-process-step h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.ac-process-step p {
    font-size: 0.9rem;
    color: var(--ac-text-muted);
    line-height: 1.6;
    margin: 0;
}

.ac-process-connector {
    display: flex;
    align-items: center;
    color: var(--ac-primary);
    opacity: 0.5;
    font-size: 1.25rem;
    padding-top: 60px;
}

@media (max-width: 992px) {
    .ac-process-connector {
        display: none;
    }
}

/* Clarification Block */
.ac-clarification-block {
    display: flex;
    gap: 20px;
    padding: 28px;
    background: rgba(255, 193, 7, 0.1);
    border: 1px solid rgba(255, 193, 7, 0.3);
    border-radius: var(--ac-radius-md);
    margin-bottom: 48px;
}

.ac-clarification-icon {
    font-size: 2rem;
    color: #f59e0b;
    flex-shrink: 0;
}

.ac-clarification-content h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--ac-dark);
}

.ac-clarification-content p {
    color: var(--ac-text);
    line-height: 1.7;
    margin: 0;
}

@media (max-width: 576px) {
    .ac-clarification-block {
        flex-direction: column;
    }
}

/* Compatibility */
.ac-compatibility-grid {
    max-width: 700px;
    margin: 0 auto;
}

.ac-compatibility-card {
    background: var(--ac-white);
    padding: 32px;
    border-radius: var(--ac-radius-lg);
    box-shadow: var(--ac-shadow-md);
}

.ac-compatibility-card h4 {
    font-size: 1.15rem;
    margin-bottom: 20px;
    color: var(--ac-dark);
}

.ac-compat-row {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
}

.ac-compat-col {
    flex: 1;
    min-width: 200px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ac-compat-col span {
    font-size: 0.95rem;
}

/* ========================================
   CHAPTER V: INTERPRETATION
   ======================================== */
.ac-interpretation {
    background: linear-gradient(180deg, #f8faf8 0%, var(--ac-white) 100%);
}

.ac-interpretation-quote {
    text-align: center;
    margin-bottom: 60px;
}

.ac-interpretation-quote blockquote {
    font-family: var(--ac-font-serif);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    color: var(--ac-primary);
    margin: 0;
    padding: 40px;
    background: linear-gradient(135deg, rgba(35, 116, 101, 0.08) 0%, rgba(194, 208, 83, 0.08) 100%);
    border-radius: var(--ac-radius-lg);
    border-left: 4px solid var(--ac-primary);
}

.ac-interpretation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.ac-interp-card {
    background: var(--ac-white);
    padding: 32px;
    border-radius: var(--ac-radius-lg);
    box-shadow: var(--ac-shadow-sm);
    border: 1px solid var(--ac-border);
    transition: var(--ac-transition);
}

.ac-interp-card:hover {
    box-shadow: var(--ac-shadow-md);
}

.ac-interp-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(35, 116, 101, 0.1);
    border-radius: 50%;
    font-size: 1.5rem;
    color: var(--ac-primary);
    margin-bottom: 20px;
}

.ac-interp-card h3 {
    font-size: 1.15rem;
    margin-bottom: 12px;
}

.ac-interp-card p {
    color: var(--ac-text-muted);
    line-height: 1.7;
    margin: 0;
}

/* Nuance Block */
.ac-nuance-block {
    background: var(--ac-white);
    border-radius: var(--ac-radius-lg);
    box-shadow: var(--ac-shadow-md);
    overflow: hidden;
}

.ac-nuance-header {
    background: linear-gradient(135deg, var(--ac-primary) 0%, var(--ac-primary-dark) 100%);
    color: var(--ac-white);
    padding: 20px 32px;
}

.ac-nuance-header h4 {
    margin: 0;
    font-size: 1.15rem;
    color: var(--ac-white);
}

.ac-nuance-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    padding: 32px;
}

.ac-nuance-do,
.ac-nuance-avoid {
    padding: 24px;
    border-radius: var(--ac-radius-md);
}

.ac-nuance-do {
    background: rgba(34, 197, 94, 0.08);
    border: 1px solid rgba(34, 197, 94, 0.2);
}

.ac-nuance-avoid {
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.ac-nuance-do h5,
.ac-nuance-avoid h5 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    margin-bottom: 16px;
}

.ac-nuance-do h5 { color: #16a34a; }
.ac-nuance-avoid h5 { color: #dc2626; }

.ac-nuance-do ul,
.ac-nuance-avoid ul {
    margin: 0;
    padding-left: 20px;
}

.ac-nuance-do li,
.ac-nuance-avoid li {
    margin-bottom: 8px;
    line-height: 1.6;
    color: var(--ac-text);
}

/* ========================================
   CHAPTER VI: CALCULATORS
   ======================================== */
.ac-calculators {
    background: var(--ac-white);
}

.ac-calculator-controls {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.ac-search-wrapper {
    flex: 1;
    min-width: 250px;
    position: relative;
}

.ac-search-wrapper i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--ac-text-muted);
}

.ac-search-input {
    width: 100%;
    padding: 14px 14px 14px 48px;
    border: 2px solid var(--ac-border);
    border-radius: var(--ac-radius-md);
    font-size: 1rem;
    transition: var(--ac-transition);
}

.ac-search-input:focus {
    outline: none;
    border-color: var(--ac-primary);
    box-shadow: 0 0 0 3px rgba(35, 116, 101, 0.1);
}

.ac-view-toggle {
    display: flex;
    gap: 4px;
}

.ac-view-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--ac-border);
    background: var(--ac-white);
    border-radius: var(--ac-radius-sm);
    color: var(--ac-text-muted);
    cursor: pointer;
    transition: var(--ac-transition);
}

.ac-view-btn:hover,
.ac-view-btn.active {
    border-color: var(--ac-primary);
    color: var(--ac-primary);
    background: rgba(35, 116, 101, 0.05);
}

/* Author Groups */
.ac-calculator-list {
    margin-bottom: 48px;
}

.ac-author-group {
    margin-bottom: 16px;
    border-radius: var(--ac-radius-md);
    overflow: hidden;
    box-shadow: var(--ac-shadow-sm);
    border: 1px solid var(--ac-border);
}

.ac-author-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    background: var(--ac-white);
    border: none;
    cursor: pointer;
    transition: var(--ac-transition);
    text-align: left;
}

.ac-author-header:hover {
    background: rgba(35, 116, 101, 0.03);
}

.ac-author-header:not(.collapsed) {
    background: linear-gradient(135deg, rgba(35, 116, 101, 0.08) 0%, rgba(194, 208, 83, 0.05) 100%);
}

.ac-author-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.ac-author-icon {
    font-size: 1.75rem;
    color: var(--ac-primary);
}

.ac-author-name {
    font-family: var(--ac-font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--ac-dark);
}

.ac-calc-count {
    font-size: 0.85rem;
    color: var(--ac-text-muted);
    background: rgba(35, 116, 101, 0.1);
    padding: 4px 12px;
    border-radius: 20px;
}

.ac-toggle-icon {
    color: var(--ac-primary);
    transition: var(--ac-transition);
}

.ac-author-header:not(.collapsed) .ac-toggle-icon {
    transform: rotate(180deg);
}

.ac-author-content {
    padding: 24px;
    background: #fafafa;
}

.ac-author-description {
    padding: 16px 20px;
    background: rgba(35, 116, 101, 0.06);
    border-radius: var(--ac-radius-sm);
    margin-bottom: 24px;
    font-size: 0.95rem;
    color: var(--ac-text);
    line-height: 1.6;
}

/* Calculator Cards Grid */
.ac-calculators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.ac-calculator-card {
    background: var(--ac-white);
    border-radius: var(--ac-radius-md);
    padding: 20px;
    box-shadow: var(--ac-shadow-sm);
    border: 1px solid var(--ac-border);
    transition: var(--ac-transition);
    display: flex;
    flex-direction: column;
}

.ac-calculator-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--ac-shadow-md);
    border-color: var(--ac-primary);
}

.ac-calc-header {
    margin-bottom: 12px;
}

.ac-calc-name {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--ac-dark);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.ac-badge-new {
    background: linear-gradient(135deg, var(--ac-secondary) 0%, var(--ac-secondary-dark) 100%);
    color: var(--ac-dark);
    font-size: 0.65rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 10px;
    text-transform: uppercase;
}

.ac-calc-era {
    font-size: 0.8rem;
    color: var(--ac-text-muted);
}

.ac-calc-target {
    font-size: 0.9rem;
    color: var(--ac-text-muted);
    margin-bottom: 16px;
    flex-grow: 1;
}

.ac-calc-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    border-top: 1px solid var(--ac-border);
}

.ac-calc-rating {
    display: flex;
    gap: 2px;
}

.ac-calc-rating i {
    font-size: 0.75rem;
    color: #ddd;
}

.ac-calc-rating i.active {
    color: #f59e0b;
}

.ac-calc-actions {
    display: flex;
    gap: 8px;
}

.ac-btn-info {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--ac-border);
    border-radius: 6px;
    color: var(--ac-text-muted);
    background: var(--ac-white);
    text-decoration: none;
    transition: var(--ac-transition);
}

.ac-btn-info:hover {
    border-color: var(--ac-primary);
    color: var(--ac-primary);
    background: rgba(35, 116, 101, 0.05);
}

.ac-btn-calculate {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--ac-primary);
    color: var(--ac-white);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 6px;
    text-decoration: none;
    transition: var(--ac-transition);
}

.ac-btn-calculate:hover {
    background: var(--ac-primary-dark);
    color: var(--ac-white);
    text-decoration: none;
}

.ac-calculators-cta {
    text-align: center;
}

/* ========================================
   CHAPTER VII: SCIENCE
   ======================================== */
.ac-science {
    background: linear-gradient(180deg, #f8faf8 0%, var(--ac-white) 100%);
}

.ac-science-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-bottom: 48px;
}

.ac-science-card {
    background: var(--ac-white);
    padding: 32px;
    border-radius: var(--ac-radius-lg);
    text-align: center;
    box-shadow: var(--ac-shadow-md);
    border: 1px solid var(--ac-border);
}

.ac-science-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--ac-primary) 0%, var(--ac-primary-dark) 100%);
    border-radius: 50%;
    font-size: 1.75rem;
    color: var(--ac-white);
}

.ac-science-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.ac-science-card p {
    color: var(--ac-text-muted);
    line-height: 1.7;
    margin: 0;
}

/* Authority Block */
.ac-authority-block {
    text-align: center;
    margin-bottom: 60px;
}

.ac-authority-block blockquote {
    font-family: var(--ac-font-serif);
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    font-style: italic;
    color: var(--ac-dark);
    max-width: 800px;
    margin: 0 auto;
    padding: 32px;
    background: rgba(35, 116, 101, 0.05);
    border-radius: var(--ac-radius-lg);
    line-height: 1.7;
}

.ac-quote-icon {
    display: block;
    margin-bottom: 16px;
    font-size: 2rem;
    color: var(--ac-primary);
}

/* Authors Section */
.ac-authors-section {
    text-align: center;
}

.ac-authors-title {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.ac-authors-subtitle {
    color: var(--ac-text-muted);
    margin-bottom: 32px;
}

.ac-authors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-bottom: 24px;
}

.ac-author-card {
    background: var(--ac-white);
    padding: 24px;
    border-radius: var(--ac-radius-md);
    box-shadow: var(--ac-shadow-sm);
    border: 1px solid var(--ac-border);
    text-align: center;
}

.ac-author-avatar {
    font-size: 3rem;
    color: var(--ac-primary);
    margin-bottom: 12px;
}

.ac-author-card h4 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.ac-author-calc-count {
    font-size: 0.8rem;
    color: var(--ac-text-muted);
    display: block;
    margin-bottom: 12px;
}

.ac-author-card p {
    font-size: 0.85rem;
    color: var(--ac-text-muted);
    line-height: 1.5;
    margin: 0;
}

.ac-authors-more {
    margin: 0;
}

.ac-authors-more a {
    color: var(--ac-primary);
    font-weight: 600;
    text-decoration: none;
}

.ac-authors-more a:hover {
    text-decoration: underline;
}

/* ========================================
   CHAPTER VIII: PRICING
   ======================================== */
.ac-pricing {
    background: linear-gradient(180deg, var(--ac-white) 0%, #f8faf8 100%);
}

.ac-final-quote {
    text-align: center;
    margin-bottom: 60px;
}

.ac-final-quote blockquote {
    font-family: var(--ac-font-serif);
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-style: italic;
    color: var(--ac-dark);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
    padding: 32px;
    background: linear-gradient(135deg, rgba(35, 116, 101, 0.05) 0%, rgba(194, 208, 83, 0.05) 100%);
    border-radius: var(--ac-radius-lg);
}

.ac-pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    max-width: 800px;
    margin: 0 auto 48px;
}

.ac-pricing-card {
    background: var(--ac-white);
    border-radius: var(--ac-radius-lg);
    padding: 32px;
    box-shadow: var(--ac-shadow-md);
    border: 2px solid var(--ac-border);
    position: relative;
    transition: var(--ac-transition);
}

.ac-pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--ac-shadow-lg);
}

.ac-pricing-card.featured {
    border-color: var(--ac-primary);
}

.ac-featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--ac-primary) 0%, var(--ac-primary-dark) 100%);
    color: var(--ac-white);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px 16px;
    border-radius: 20px;
    text-transform: uppercase;
}

.ac-pricing-header {
    text-align: center;
    margin-bottom: 24px;
}

.ac-pricing-header h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.ac-pricing-amount {
    margin-bottom: 8px;
}

.ac-price {
    font-family: var(--ac-font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--ac-dark);
}

.ac-pricing-note {
    font-size: 0.85rem;
    color: var(--ac-text-muted);
    margin: 0;
}

.ac-pricing-features {
    margin-bottom: 24px;
}

.ac-pro-intro {
    font-weight: 600;
    margin-bottom: 12px;
    text-align: center;
}

.ac-pricing-features ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ac-pricing-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    border-bottom: 1px solid var(--ac-border);
}

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

.ac-pricing-free .ac-pricing-features i {
    color: #16a34a;
}

.ac-pricing-pro .ac-pricing-features i {
    color: #f59e0b;
}

.ac-pricing-card .ac-btn-primary,
.ac-pricing-card .ac-btn-outline {
    width: 100%;
    justify-content: center;
}

/* Trust Section */
.ac-trust-section {
    margin-bottom: 48px;
}

.ac-trust-badges-final {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.ac-trust-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--ac-text-muted);
}

.ac-trust-badge i {
    color: var(--ac-primary);
    font-size: 1.25rem;
}

/* Final CTA */
.ac-final-cta {
    text-align: center;
    padding: 48px;
    background: linear-gradient(135deg, var(--ac-primary) 0%, var(--ac-primary-dark) 100%);
    border-radius: var(--ac-radius-xl);
    color: var(--ac-white);
}

.ac-final-cta h3 {
    font-size: 2rem;
    color: var(--ac-white);
    margin-bottom: 12px;
}

.ac-final-cta p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 24px;
}

.ac-final-cta .ac-btn-primary-large {
    background: var(--ac-white);
    color: var(--ac-primary);
}

.ac-final-cta .ac-btn-primary-large:hover {
    background: rgba(255, 255, 255, 0.9);
    color: var(--ac-primary-dark);
}

/* ========================================
   FAQ SECTION
   ======================================== */
.ac-faq {
    background: var(--ac-white);
}

.ac-faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.ac-faq-item {
    margin-bottom: 12px;
    border-radius: var(--ac-radius-md);
    overflow: hidden;
    box-shadow: var(--ac-shadow-sm);
    border: 1px solid var(--ac-border);
}

.ac-faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    background: var(--ac-white);
    border: none;
    cursor: pointer;
    text-align: left;
    font-size: 1rem;
    font-weight: 600;
    color: var(--ac-dark);
    transition: var(--ac-transition);
}

.ac-faq-question:hover {
    background: rgba(35, 116, 101, 0.03);
}

.ac-faq-question:not(.collapsed) {
    background: rgba(35, 116, 101, 0.05);
}

.ac-faq-question i {
    color: var(--ac-primary);
    transition: var(--ac-transition);
}

.ac-faq-question:not(.collapsed) i {
    transform: rotate(180deg);
}

.ac-faq-answer {
    padding: 0 24px 20px;
    color: var(--ac-text-muted);
    line-height: 1.7;
}

/* ========================================
   RELATED PRODUCTS
   ======================================== */
.ac-related-products {
    padding: 60px 0;
    background: linear-gradient(180deg, #f8faf8 0%, var(--ac-white) 100%);
}

.ac-related-title {
    text-align: center;
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    color: var(--ac-dark);
    margin-bottom: 40px;
    font-family: var(--ac-font-display);
    font-weight: 700;
}

.ac-related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    max-width: 1200px;
    margin: 0 auto;
}

@media (max-width: 991px) {
    .ac-related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 575px) {
    .ac-related-grid {
        grid-template-columns: 1fr;
    }
}

.ac-related-card {
    background: var(--ac-white);
    border-radius: var(--ac-radius-lg);
    overflow: hidden;
    box-shadow: var(--ac-shadow-md);
    border: 1px solid var(--ac-border);
    position: relative;
    transition: var(--ac-transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.ac-related-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--ac-shadow-lg);
}

.ac-related-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background: var(--ac-primary);
    color: var(--ac-white);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 4px;
    text-transform: uppercase;
    z-index: 1;
}

.ac-related-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-bottom: 1px solid var(--ac-border);
}

.ac-related-content {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.ac-related-content h4 {
    font-size: 1.2rem;
    color: var(--ac-dark);
    margin-bottom: 8px;
    font-family: var(--ac-font-sans);
    font-weight: 600;
}

.ac-related-content p {
    font-size: 0.95rem;
    color: var(--ac-text-muted);
    line-height: 1.6;
    margin-bottom: 16px;
    flex-grow: 1;
}

.ac-related-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--ac-primary);
    font-weight: 600;
    text-decoration: none;
    transition: var(--ac-transition);
    margin-top: auto;
}

.ac-related-link:hover {
    color: var(--ac-accent);
    text-decoration: underline;
}

.ac-related-link i {
    transition: transform 0.2s ease;
}

.ac-related-link:hover i {
    transform: translateX(4px);
}

/* ========================================
   STICKY CTA
   ======================================== */
.ac-sticky-cta {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--ac-white);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 12px 20px;
    transform: translateY(100%);
    transition: var(--ac-transition);
}

.ac-sticky-cta.visible {
    transform: translateY(0);
}

.ac-sticky-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.ac-sticky-text {
    display: flex;
    flex-direction: column;
}

.ac-sticky-title {
    font-weight: 700;
    color: var(--ac-dark);
}

.ac-sticky-subtitle {
    font-size: 0.85rem;
    color: var(--ac-text-muted);
}

.ac-sticky-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--ac-primary);
    color: var(--ac-white);
    font-weight: 600;
    border-radius: var(--ac-radius-md);
    text-decoration: none;
    transition: var(--ac-transition);
    white-space: nowrap;
}

.ac-sticky-button:hover {
    background: var(--ac-primary-dark);
    color: var(--ac-white);
    text-decoration: none;
}

@media (max-width: 576px) {
    .ac-sticky-subtitle {
        display: none;
    }
}

/* ========================================
   RESPONSIVE ADJUSTMENTS
   ======================================== */
@media (max-width: 768px) {
    .ac-section {
        padding: 60px 0;
    }
    
    .ac-chapter-header {
        margin-bottom: 40px;
    }
    
    .ac-hero {
        padding: 100px 16px 60px;
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */
@media print {
    .ac-page-nav,
    .ac-back-to-top,
    .ac-scroll-progress,
    .ac-sticky-cta,
    .ac-hero-cta,
    .ac-scroll-indicator {
        display: none !important;
    }
    
    .ac-section {
        page-break-inside: avoid;
    }
}