/* ============================================
   Variables CSS
   ============================================ */
:root {
    /* VERSION ORIGINALE ROUGE (sauvegarde) */
    /* --primary-color: #E31E24; */
    /* --primary-dark: #B81820; */
    /* --primary-light: #FF4D52; */
    
    /* VERSION ADOUCIE ROUGE + BLEU */
    --primary-color: #E31E24;
    --primary-dark: #B81820;
    --primary-light: #FF4D52;
    
    /* Couleur bleue de la couverture du livre */
    --blue-book: #2C3E88;
    --blue-book-light: #4A5BA8;
    --blue-book-dark: #1F2C5C;
    
    /* Couleurs secondaires */
    --secondary-color: #2C3E50;
    --accent-color: #FFD700;
    
    /* Nuances de gris */
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    
    /* Typographie */
    --font-primary: 'Playfair Display', serif;
    --font-secondary: 'Inter', sans-serif;
    
    /* Espacements */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Ombres */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Bordures */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-secondary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-700);
    background-color: #FFFFFF;
    overflow-x: hidden;
}

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

/* ============================================
   Typographie
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

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

a:hover {
    color: var(--primary-dark);
}

/* ============================================
   Boutons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    font-family: var(--font-secondary);
    font-weight: 600;
    font-size: 1rem;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #FFFFFF;
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: #FFFFFF;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-nav {
    padding: 0.5rem 1.25rem;
    font-size: 0.95rem;
}

/* ============================================
   Header / Navigation
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: #FFFFFF;
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: var(--transition-normal);
}

.header.scrolled {
    box-shadow: var(--shadow-lg);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-lca {
    height: 50px;
    width: auto;
    object-fit: contain;
}

.brand-text {
    font-family: var(--font-primary);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    font-weight: 500;
    color: var(--gray-700);
    padding: 0.5rem 0;
    position: relative;
    transition: var(--transition-fast);
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--gray-900);
    border-radius: var(--radius-sm);
    transition: var(--transition-normal);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    margin-top: 90px;
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, rgba(44, 62, 136, 0.05) 0%, #FFFFFF 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

.highlight {
    color: var(--primary-color);
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
}

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

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

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--blue-book);
    font-family: var(--font-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--gray-600);
    margin-top: var(--spacing-xs);
}

.hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.5rem 1rem;
    background-color: var(--gray-100);
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
}

.badge i {
    color: var(--blue-book);
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.book-3d {
    perspective: 1500px;
    cursor: pointer;
    transition: var(--transition-slow);
}

.book-cover {
    width: 100%;
    max-width: 450px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    transition: var(--transition-slow);
    transform-style: preserve-3d;
}

.book-3d:hover .book-cover {
    transform: scale(1.05);
}

/* ============================================
   Sections communes
   ============================================ */
.section {
    padding: var(--spacing-2xl) 0;
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-2xl);
}

.section-title {
    font-size: 2.5rem;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
}

/* ============================================
   Pourquoi ce livre
   ============================================ */
.section-pourquoi {
    background-color: #FFFFFF;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.benefit-card {
    padding: var(--spacing-xl);
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
    border: 2px solid transparent;
}

.benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.benefit-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--blue-book) 0%, var(--blue-book-light) 100%);
    color: #FFFFFF;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
}

.benefit-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.benefit-card p {
    color: var(--gray-600);
    line-height: 1.7;
    margin: 0;
}

/* ============================================
   Public cible
   ============================================ */
.section-public {
    background-color: var(--gray-50);
}

.public-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.public-card {
    padding: var(--spacing-lg);
    background-color: #FFFFFF;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-normal);
    border: 2px solid var(--gray-200);
}

.public-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.public-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--blue-book) 0%, var(--blue-book-light) 100%);
    color: #FFFFFF;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.public-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.public-card p {
    color: var(--gray-600);
    font-size: 0.95rem;
    margin: 0;
}

/* ============================================
   Le livre
   ============================================ */
.section-livre {
    background-color: #FFFFFF;
}

.livre-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.livre-mockup {
    position: relative;
    padding: var(--spacing-lg);
}

.mockup-img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.livre-description {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: var(--spacing-xl);
}

.livre-features {
    list-style: none;
    margin-bottom: var(--spacing-xl);
}

.livre-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    font-size: 1.05rem;
    color: var(--gray-700);
}

.livre-features i {
    color: var(--primary-color);
    font-size: 1.25rem;
}

.livre-info {
    background-color: var(--gray-50);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
}

.livre-info p {
    margin-bottom: var(--spacing-xs);
    color: var(--gray-700);
}

.livre-info p:last-child {
    margin-bottom: 0;
}

/* ============================================
   Préface
   ============================================ */
.section-preface {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: #FFFFFF;
}

.preface-card {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    padding: var(--spacing-xl);
}

.preface-icon {
    font-size: 3rem;
    color: rgba(255, 255, 255, 0.3);
    margin-bottom: var(--spacing-lg);
}

.preface-quote {
    font-size: 1.25rem;
    line-height: 1.8;
    font-style: italic;
    color: #FFFFFF;
    margin-bottom: var(--spacing-xl);
}

.preface-author {
    font-size: 1.05rem;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.9);
}

/* ============================================
   Table des matières
   ============================================ */
.section-contenu {
    background-color: var(--gray-50);
}

.contenu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.contenu-partie {
    background-color: #FFFFFF;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.partie-header {
    margin-bottom: var(--spacing-lg);
}

.partie-number {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, var(--blue-book) 0%, var(--blue-book-dark) 100%);
    color: #FFFFFF;
    font-weight: 700;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
}

.partie-header h3 {
    font-size: 1.5rem;
    color: var(--gray-900);
    margin-bottom: 0;
}

.partie-chapitres {
    list-style: none;
}

.partie-chapitres li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--gray-200);
    color: var(--gray-700);
    display: flex;
    gap: var(--spacing-sm);
}

.partie-chapitres li:last-child {
    border-bottom: none;
}

.chapitre-num {
    color: var(--blue-book);
    font-weight: 600;
    min-width: 25px;
}

.annexes-section {
    background-color: #FFFFFF;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.annexes-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--gray-900);
}

.annexes-title i {
    color: var(--blue-book);
    margin-right: var(--spacing-sm);
}

.annexes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.annexe-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--gray-50);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.annexe-item:hover {
    background-color: var(--gray-100);
    transform: translateX(5px);
}

.annexe-item i {
    color: var(--blue-book);
    font-size: 1.25rem;
}

/* ============================================
   L'auteur
   ============================================ */
.section-auteur {
    background-color: #FFFFFF;
}

.auteur-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.auteur-name {
    color: var(--blue-book);
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.auteur-bio {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: var(--spacing-md);
}

.lca-info {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
    padding: var(--spacing-lg);
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-xl);
}

.lca-logo {
    height: 80px;
    width: auto;
    object-fit: contain;
}

.lca-text h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.lca-text p {
    margin: 0;
    color: var(--gray-600);
}

.auteur-photo {
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.auteur-img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

.auteur-photo-placeholder {
    width: 100%;
    aspect-ratio: 3/4;
    background: linear-gradient(135deg, var(--gray-200), var(--gray-300));
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
}

.auteur-photo-placeholder i {
    font-size: 5rem;
    margin-bottom: var(--spacing-md);
}

.auteur-photo-placeholder p {
    font-size: 1.25rem;
    font-weight: 600;
}

/* ============================================
   Témoignages
   ============================================ */
.section-temoignages {
    background-color: var(--gray-50);
}

.temoignages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.temoignage-card {
    background-color: #FFFFFF;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.temoignage-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.temoignage-stars {
    display: flex;
    gap: 0.25rem;
    margin-bottom: var(--spacing-md);
    color: var(--accent-color);
    font-size: 1.25rem;
}

.temoignage-text {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--gray-700);
    font-style: italic;
    margin-bottom: var(--spacing-lg);
}

.temoignage-author {
    border-top: 2px solid var(--gray-200);
    padding-top: var(--spacing-md);
}

.temoignage-author strong {
    display: block;
    color: var(--gray-900);
    margin-bottom: 0.25rem;
}

.temoignage-author span {
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* ============================================
   FAQ
   ============================================ */
.section-faq {
    background-color: #FFFFFF;
}

.faq-container {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    border: 2px solid transparent;
    transition: var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--primary-color);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background-color: transparent;
    border: none;
    text-align: left;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    cursor: pointer;
    transition: var(--transition-fast);
}

.faq-question:hover {
    color: var(--primary-color);
}

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

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--gray-700);
    line-height: 1.8;
    margin: 0;
}

/* ============================================
   Commander
   ============================================ */
.section-commander {
    background: linear-gradient(135deg, var(--gray-50) 0%, #FFFFFF 100%);
}

.commander-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.commander-book {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.commander-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
}

.commander-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--gray-50);
    border-radius: var(--radius-md);
}

.feature-item i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.commander-cta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.commander-cta .btn {
    justify-content: center;
}

.commander-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--gray-100);
    border-radius: var(--radius-md);
    color: var(--gray-700);
    font-size: 0.95rem;
}

.commander-info i {
    color: var(--primary-color);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background-color: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    height: 60px;
    width: auto;
    margin-bottom: var(--spacing-md);
}

.footer-description {
    color: var(--gray-400);
    line-height: 1.6;
    font-size: 0.95rem;
}

.footer-col h4 {
    color: #FFFFFF;
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--gray-400);
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-contact {
    list-style: none;
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--gray-400);
}

.footer-contact i {
    color: var(--primary-color);
    width: 20px;
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--gray-800);
    color: var(--gray-400);
    border-radius: 50%;
    transition: var(--transition-fast);
}

.footer-social a:hover {
    background-color: var(--primary-color);
    color: #FFFFFF;
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-800);
    color: var(--gray-500);
    font-size: 0.9rem;
}

.footer-bottom p {
    margin-bottom: var(--spacing-xs);
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: #FFFFFF;
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

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

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    
    .hero-content,
    .livre-content,
    .commander-content,
    .auteur-content {
        grid-template-columns: 1fr;
    }
    
    .contenu-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 90px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 90px);
        background-color: #FFFFFF;
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-xl);
        box-shadow: var(--shadow-lg);
        transition: var(--transition-normal);
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-link {
        width: 100%;
        padding: var(--spacing-md) 0;
        font-size: 1.125rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-cta .btn {
        width: 100%;
        justify-content: center;
    }
    
    .benefits-grid,
    .public-grid,
    .temoignages-grid {
        grid-template-columns: 1fr;
    }
    
    .commander-features {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .lca-info {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .brand-text {
        display: none;
    }
}

/* ============================================
   Images agrandies pour meilleure lisibilité
   ============================================ */
.book-cover-large {
    max-width: 500px !important;
}

.mockup-img-large {
    max-width: 500px !important;
}

.commander-book-large {
    max-width: 500px !important;
}

@media (max-width: 768px) {
    .book-cover-large,
    .mockup-img-large,
    .commander-book-large {
        max-width: 100% !important;
    }
}