/* ===== VARIABLES ET RESET ===== */
:root {
    /* Couleurs principales - thème sombre moderne */
    --color-primary: #2E7D32;        /* Vert profond */
    --color-primary-light: #4CAF50;   /* Vert clair */
    --color-primary-dark: #1B5E20;    /* Vert foncé */
    
    --color-secondary: #1565C0;       /* Bleu profond */
    --color-secondary-light: #2196F3;  /* Bleu clair */
    --color-secondary-dark: #0D47A1;    /* Bleu foncé */
    
    /* Couleurs de fond */
    --color-bg-primary: #0A1929;       /* Fond principal très sombre */
    --color-bg-secondary: #132F4C;      /* Fond secondaire */
    --color-bg-tertiary: #1E3A5F;      /* Fond tertiaire */
    --color-bg-card: #1A2C42;         /* Fond des cartes */
    
    /* Couleurs de texte */
    --color-text-primary: #E3F2FD;    /* Texte principal clair */
    --color-text-secondary: #90CAF9;   /* Texte secondaire */
    --color-text-muted: #64B5F6;      /* Texte atténué */
    
    /* Couleurs d'accent */
    --color-accent: #00BFA5;          /* Teal pour les accents */
    --color-accent-light: #1DE9B6;    /* Teal clair */
    
    /* Couleurs d'interface */
    --color-border: #2D4A6E;          /* Bordures */
    --color-hover: rgba(33, 150, 243, 0.1); /* Survol */
    
    /* Effets */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(46, 125, 50, 0.3);
    
    /* Typographie */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-secondary: 'Space Grotesk', 'Inter', sans-serif;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Espacements */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
}

/* ===== RESET ET BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(46, 125, 50, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(21, 101, 192, 0.1) 0%, transparent 50%);
}

.main-content {
    padding-top: 80px; /* Pour compenser la navbar fixe */
    min-height: calc(100vh - 200px); /* Hauteur minimale moins footer */
}

/* ===== TYPOGRAPHIE ===== */
h1, h2, h3, h4, .section-title {
    font-family: var(--font-secondary);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 3.5rem;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

h2, .section-title {
    font-size: 2.5rem;
    color: var(--color-text-primary);
    position: relative;
    display: inline-block;
}

h3, .content-title {
    font-size: 1.8rem;
    color: var(--color-text-secondary);
    margin: var(--spacing-md) 0 var(--spacing-sm);
}

h4 {
    font-size: 1.4rem;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

p {
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
    color: var(--color-text-muted);
}

.lead-paragraph {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
    font-weight: 300;
}

/* ===== LAYOUT ===== */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

.dark-section {
    background-color: var(--color-bg-secondary);
    position: relative;
    overflow: hidden;
}

.dark-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent, 
        var(--color-primary-light), 
        transparent);
}

/* ===== GRIDS ET FLEXBOX ===== */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
    margin-bottom: var(--spacing-xl);
}

.phase-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

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

@media (max-width: 768px) {
    .content-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .phase-container {
        grid-template-columns: 1fr;
    }
    
    .factors-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .factors-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== COMPOSANTS ===== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 2px;
}

/* Diagramme de processus */
.process-diagram {
    background: var(--color-bg-card);
    border-radius: 16px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

.process-step {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    border-radius: 12px;
    transition: var(--transition-normal);
    background: linear-gradient(90deg, transparent, rgba(46, 125, 50, 0.05));
}

.process-step:hover {
    background: linear-gradient(90deg, transparent, rgba(46, 125, 50, 0.1));
    transform: translateX(10px);
}

.step-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--spacing-md);
    flex-shrink: 0;
    color: white;
    font-size: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.step-content h4 {
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.step-content p {
    color: var(--color-text-muted);
    margin: 0;
    font-size: 0.95rem;
}

/* Boîte d'équation */
.equation-box {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.equation-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
}

.equation-box p {
    font-family: 'Courier New', monospace;
    font-size: 1.4rem;
    color: var(--color-text-primary);
    margin: 0;
}

.equation-desc {
    font-size: 1rem !important;
    color: var(--color-text-muted) !important;
    margin-top: var(--spacing-xs) !important;
}

/* Cartes de facteurs */
.factor-card {
    background: var(--color-bg-card);
    border-radius: 16px;
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-normal);
    border: 1px solid var(--color-border);
    opacity: 0;
    transform: translateY(20px);
}

.factor-card.animate-in {
    animation: slideUp 0.6s ease forwards;
}

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

.factor-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    font-size: 2rem;
    color: white;
}

.factor-icon.intensity {
    background: linear-gradient(135deg, #FF9800, #FF5722);
}

.factor-icon.concentration {
    background: linear-gradient(135deg, #2196F3, #1565C0);
}

.factor-icon.temperature {
    background: linear-gradient(135deg, #F44336, #D32F2F);
}

.factor-icon.water {
    background: linear-gradient(135deg, #00BCD4, #00838F);
}

.factor-card h3 {
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.4rem;
}

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

/* Liste de fonctionnalités */
.feature-list {
    list-style: none;
    margin: var(--spacing-md) 0;
}

.feature-list li {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-muted);
}

.feature-list i {
    color: var(--color-primary-light);
    margin-right: var(--spacing-sm);
    font-size: 0.9rem;
}

/* Conteneur FAQ */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

/* ===== ANIMATIONS ===== */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes glowPulse {
    0%, 100% {
        box-shadow: var(--shadow-glow);
    }
    50% {
        box-shadow: 0 0 30px rgba(46, 125, 50, 0.6);
    }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    h1 {
        font-size: 2.5rem;
    }
    
    h2, .section-title {
        font-size: 2rem;
    }
    
    .section-container {
        padding: var(--spacing-lg) var(--spacing-sm);
    }
    
    .content-grid {
        gap: var(--spacing-lg);
    }
    
    .process-step {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-md);
    }
    
    .step-icon {
        margin-right: 0;
        margin-bottom: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    
    h2, .section-title {
        font-size: 1.8rem;
    }
    
    .section-container {
        padding: var(--spacing-md) var(--spacing-xs);
    }
    
    .process-step:hover {
        transform: translateX(5px);
    }
}

/* ===== UTILITAIRES ===== */
.animate-in {
    animation: slideUp 0.6s ease forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== SCROLLBAR PERSONNALISÉE ===== */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--color-primary-light), var(--color-secondary-light));
}