/* ===================================
   CONCEPTION RESPONSABLE - STYLES CSS
   =================================== */

/* --- Variables CSS --- */
:root {
    /* Couleurs principales */
    --primary-color: #2c5282;
    --primary-dark: #1a365d;
    --primary-light: #3182ce;
    --secondary-color: #38a169;
    --secondary-dark: #276749;
    --secondary-light: #48bb78;
    
    /* Couleurs neutres */
    --text-primary: #2d3748;
    --text-secondary: #4a5568;
    --text-light: #718096;
    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --bg-tertiary: #edf2f7;
    --border-color: #e2e8f0;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    /* Espacements */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Typographie */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-heading: var(--font-primary);
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    
    /* Autres */
    --border-radius: 0.5rem;
    --border-radius-sm: 0.25rem;
    --border-radius-lg: 1rem;
    --shadow-sm: 0 1px 3px 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);
    --transition: all 0.3s ease;
}

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

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

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

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

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

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

a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

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

/* --- Skip Link (Accessibilité) --- */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 100;
    text-decoration: none;
}

.skip-link:focus {
    top: 0;
}

/* --- Utility Classes --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* --- Navigation Header --- */
header {
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.main-nav {
    padding: var(--spacing-md) 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
}

.logo {
    height: 40px;
    width: auto;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    align-items: center;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
}

.nav-link,
.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
    background: none;
    border: none;
    cursor: pointer;
    font-size: var(--font-size-base);
    font-family: inherit;
}

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

.dropdown-arrow {
    font-size: 0.75rem;
    transition: var(--transition);
}

.dropdown-toggle[aria-expanded="true"] .dropdown-arrow {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-lg);
    border-radius: var(--border-radius);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    list-style: none;
    padding: var(--spacing-sm) 0;
    margin: 0;
    z-index: 100;
}

.dropdown-menu.active,
.nav-item:hover .dropdown-menu,
.nav-item:focus-within .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--text-primary);
    transition: var(--transition);
}

.dropdown-menu a:hover {
    background-color: var(--bg-secondary);
    color: var(--primary-color);
}

.dropdown-menu a[aria-current="page"] {
    font-weight: 600;
    color: var(--primary-color);
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle-bar {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition);
}

.nav-toggle.active .nav-toggle-bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active .nav-toggle-bar:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* --- Hero Section --- */
.hero {
    background: var(--gradient-hero);
    color: white;
    padding: var(--spacing-3xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.hero h1 {
    color: white;
    margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-2xl);
    opacity: 0.95;
}

.cta-button {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-2xl);
    background-color: white;
    color: var(--primary-color);
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

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

/* --- Objectives Section --- */
.objectives {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-secondary);
}

.objectives h2 {
    text-align: center;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-lg);
}

.objectives-intro {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

.objectives-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.objective-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    text-align: center;
}

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

.card-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.objective-card h3 {
    color: var(--primary-dark);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

.objective-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.card-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary-color);
    font-weight: 500;
    transition: var(--transition);
}

.card-link:hover {
    color: var(--primary-dark);
    transform: translateX(5px);
}

/* --- Navigation Section --- */
.navigation-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-primary);
}

.navigation-section h2 {
    text-align: center;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-2xl);
}

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

.nav-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.nav-card .icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: var(--spacing-md);
}

.nav-card h3 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-md);
}

.nav-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.nav-card-links {
    list-style: none;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    margin: 0;
}

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

.nav-card-links a {
    color: var(--primary-color);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
}

.nav-card-links a::before {
    content: '→';
    margin-right: var(--spacing-sm);
    transition: var(--transition);
}

.nav-card-links a:hover::before {
    transform: translateX(3px);
}

/* --- Stats Section --- */
.stats-section {
    padding: var(--spacing-3xl) 0;
    background: var(--gradient-primary);
    color: white;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-2xl);
    text-align: center;
}

.stat-card {
    padding: var(--spacing-xl);
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.stat-unit {
    font-size: var(--font-size-2xl);
}

.stat-label {
    font-size: var(--font-size-base);
    opacity: 0.9;
}

/* --- CTA Section --- */
.cta-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-secondary);
}

.cta-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-content h2 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-lg);
}

.cta-content p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* --- Footer --- */
.main-footer {
    background-color: var(--text-primary);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
}

.footer-section h3 {
    color: white;
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

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

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
}

.github-link {
    display: inline-block;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.github-link:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: white;
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
    /* Ajustements typographiques */
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }
    h3 { font-size: var(--font-size-xl); }
    
    /* Navigation mobile */
    .nav-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 60px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 60px);
        background-color: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-2xl);
        gap: var(--spacing-lg);
        transition: var(--transition);
        overflow-y: auto;
        box-shadow: var(--shadow-lg);
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .nav-item {
        width: 100%;
    }
    
    .dropdown-toggle {
        width: 100%;
        justify-content: space-between;
    }
    
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .dropdown-menu.active {
        max-height: 500px;
    }
    
    /* Sections mobiles */
    .hero {
        padding: var(--spacing-2xl) 0;
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .objectives-grid,
    .nav-grid,
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 300px;
    }
}

/* --- Impression --- */
@media print {
    /* Masquer les éléments non essentiels */
    .nav-toggle,
    .skip-link,
    .cta-section,
    .stats-section {
        display: none;
    }
    
    /* Simplifier la navigation */
    .dropdown-menu {
        display: none;
    }
    
    /* Optimiser les couleurs */
    body {
        color: black;
        background: white;
    }
    
    a {
        color: black;
        text-decoration: underline;
    }
    
    /* Forcer les sauts de page appropriés */
    .objectives,
    .navigation-section {
        page-break-before: always;
    }
}