/* ==========================================
   VARIABLES ET CONFIGURATION GLOBALE
   ========================================== */

:root {
    /* Couleurs principales */
    --primary-blue: #1a2332;
    --secondary-green: #2d4a3d;
    --accent-gold: #d4af37;
    --accent-gold-light: #f4d03f;
    
    /* Couleurs neutres */
    --white: #ffffff;
    --light-gray: #f8f9fa;
    --medium-gray: #6c757d;
    --dark-gray: #343a40;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    
    /* Dégradés */
    --gradient-primary: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-green) 100%);
    --gradient-gold: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-gold-light) 100%);
    
    /* Typographie */
    --font-primary: 'Inter', sans-serif;
    --font-display: 'Playfair Display', serif;
    
    /* Espacements */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Bordures et ombres */
    --border-radius: 8px;
    --border-radius-lg: 16px;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.15);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ==========================================
   RESET ET STYLES DE BASE
   ========================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--white);
    overflow-x: hidden;
}

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

/* ==========================================
   HEADER
   ========================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(26, 35, 50, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition-medium);
}

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

.logo h1 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-gold);
    margin-bottom: 0.2rem;
}

.logo .subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 300;
}

.nav {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--accent-gold);
    background: rgba(212, 175, 55, 0.1);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-xs);
}

/* ==========================================
   HERO SECTION
   ========================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--gradient-primary);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><radialGradient id="a" cx="50%" cy="50%" r="50%"><stop offset="0%" stop-color="%23d4af37" stop-opacity="0.1"/><stop offset="100%" stop-color="%231a2332" stop-opacity="0.1"/></radialGradient></defs><rect width="100%" height="100%" fill="url(%23a)"/></svg>') center/cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 35, 50, 0.7);
}

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

.hero-title {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--accent-gold);
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--white);
    margin-bottom: var(--spacing-md);
    font-weight: 400;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--gradient-gold);
    color: var(--primary-blue);
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--border-radius-lg);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-medium);
    box-shadow: var(--shadow-lg);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.book-cover-image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.book-cover-img {
    max-width: 100%;
    height: auto;
    max-height: 500px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    transition: var(--transition-medium);
    object-fit: cover;
}

.book-cover-img:hover {
    transform: scale(1.05) rotateY(5deg);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
}

.book-cover-placeholder {
    display: none;
    background: rgba(255, 255, 255, 0.1);
    border: 2px dashed var(--accent-gold);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--white);
    backdrop-filter: blur(10px);
}

.book-cover-placeholder i {
    font-size: 4rem;
    color: var(--accent-gold);
    margin-bottom: var(--spacing-sm);
}

.book-cover-placeholder p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
}

.book-cover-placeholder small {
    color: var(--text-secondary);
}

/* ==========================================
   INTRODUCTION SECTION
   ========================================== */

.introduction {
    padding: var(--spacing-xl) 0;
    background: var(--light-gray);
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    text-align: center;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-lg);
}

.intro-text {
    font-size: 1.2rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ==========================================
   SOMMAIRE SECTION
   ========================================== */

.sommaire {
    padding: var(--spacing-xl) 0;
    background: var(--white);
}

.sommaire-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.sommaire-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: var(--transition-medium);
    border: 1px solid rgba(26, 35, 50, 0.1);
}

.sommaire-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent-gold);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.card-header i {
    font-size: 1.5rem;
    color: var(--accent-gold);
}

.card-header h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    color: var(--primary-blue);
}

.card-header small {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-left: auto;
}

.card-content {
    list-style: none;
}

.card-content li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-md);
}

.card-content li::before {
    content: '•';
    color: var(--accent-gold);
    position: absolute;
    left: 0;
}

/* ==========================================
   INSCRIPTION SECTION
   ========================================== */

.inscription {
    padding: var(--spacing-xl) 0;
    background: var(--gradient-primary);
    color: var(--white);
}

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

.inscription .section-title {
    color: var(--white);
    text-align: left;
    margin-bottom: var(--spacing-md);
}

.inscription-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.inscription-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
}

.feature i {
    color: var(--accent-gold);
    font-size: 1.2rem;
}

.inscription-form-container {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-xl);
}

.inscription-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-group input,
.form-group select {
    padding: 0.8rem 1rem;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition-fast);
    background: var(--white);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-gold);
    box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.submit-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    background: var(--gradient-gold);
    color: var(--primary-blue);
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-medium);
    margin-top: var(--spacing-sm);
}

.submit-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.success-message {
    text-align: center;
    padding: var(--spacing-lg);
    background: #d4edda;
    border: 1px solid #c3e6cb;
    border-radius: var(--border-radius);
    color: #155724;
}

.success-message i {
    font-size: 3rem;
    color: #28a745;
    margin-bottom: var(--spacing-sm);
}

.success-message h3 {
    color: #155724;
    margin-bottom: var(--spacing-xs);
}

/* ==========================================
   FOOTER
   ========================================== */

.footer {
    background: var(--primary-blue);
    color: var(--white);
    padding: var(--spacing-md) 0;
    text-align: center;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-info h3 {
    font-family: var(--font-display);
    color: var(--accent-gold);
    margin-bottom: var(--spacing-xs);
}

.footer-info p {
    color: var(--text-secondary);
}

.footer-copyright {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }
    
    .nav {
        display: none;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-md);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .book-cover-img {
        max-height: 350px;
        margin-top: var(--spacing-md);
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .sommaire-grid {
        grid-template-columns: 1fr;
    }
    
    .inscription-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-xs);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .cta-button,
    .submit-button {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
}

/* ==========================================
   ANIMATIONS
   ========================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.pulse {
    animation: pulse 2s infinite;
}

/* ==========================================
   UTILITAIRES
   ========================================== */

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

.text-gold {
    color: var(--accent-gold);
}

.bg-primary {
    background: var(--primary-blue);
}

.bg-gradient {
    background: var(--gradient-primary);
}

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

.rounded {
    border-radius: var(--border-radius);
}

.hidden {
    display: none;
}

.visible {
    display: block;
}