/* Fichier CSS principal pour Mère Nature */

/* Variables CSS */
:root {
    --primary-green: #2E7D32;
    --light-green: #4CAF50;
    --dark-green: #1B5E20;
    --accent-green: #66BB6A;
    --primary-blue: #1976D2;
    --accent-blue: #2196F3;
    --warning-orange: #FF6B35;
    --danger-red: #F44336;
    --neutral-gray: #757575;
    --light-gray: #F5F5F5;
    --white: #FFFFFF;
    --black: #212121;
    
    /* Typographie */
    --font-family-base: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-family-heading: 'Roboto', 'Segoe UI', sans-serif;
    
    /* Espacements */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Ombres */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
}

/* Styles de base */
* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family-base);
    line-height: 1.6;
    color: var(--black);
    background-color: var(--white);
}

/* Typographie */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

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

a {
    color: var(--primary-green);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--dark-green);
    text-decoration: underline;
}

/* Header */
.main-header {
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--accent-green) 100%);
    box-shadow: var(--shadow-md);
}

.top-bar {
    background: rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    font-size: 0.875rem;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
    transition: transform 0.3s ease;
}

.navbar-brand:hover {
    transform: translateY(-2px);
    text-decoration: none;
}

.navbar-nav .nav-link {
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md) !important;
    border-radius: 4px;
    margin: 0 var(--spacing-xs);
    transition: all 0.3s ease;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white) !important;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--accent-green) 50%, var(--primary-blue) 100%);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    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 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.hero-section .container {
    position: relative;
    z-index: 1;
}

/* Page Headers */
.page-header {
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--accent-green) 100%);
    position: relative;
    overflow: hidden;
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--warning-orange), var(--primary-blue), var(--warning-orange));
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Cards */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    overflow: hidden;
}

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

.card-header {
    background: linear-gradient(135deg, var(--primary-green), var(--accent-green));
    color: var(--white);
    font-weight: 600;
    border: none;
}

.card-img-top {
    height: 200px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.card:hover .card-img-top {
    transform: scale(1.05);
}

/* Badges */
.badge {
    font-weight: 500;
    padding: 0.375rem 0.75rem;
    border-radius: 6px;
}

/* Buttons */
.btn {
    font-weight: 500;
    padding: 0.625rem 1.25rem;
    border-radius: 6px;
    transition: all 0.3s ease;
    border: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-success {
    background: linear-gradient(135deg, var(--primary-green), var(--accent-green));
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-blue));
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning-orange), #FF8A65);
}

/* Forms */
.form-control,
.form-select {
    border-radius: 6px;
    border: 2px solid #E0E0E0;
    padding: 0.75rem;
    transition: all 0.3s ease;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-green);
    box-shadow: 0 0 0 0.2rem rgba(46, 125, 50, 0.25);
}

/* Alerts */
.alert {
    border: none;
    border-radius: 8px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

/* Sections thématiques */
.climate-article .card-header {
    background: linear-gradient(135deg, var(--warning-orange), #FF8A65);
}

.forest-article .card-header {
    background: linear-gradient(135deg, var(--primary-green), var(--accent-green));
}

.pollution-article .card-header {
    background: linear-gradient(135deg, var(--danger-red), #EF5350);
}

.project-article .card-header {
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-blue));
}

.international-article .card-header {
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-blue));
}

.africa-article .card-header {
    background: linear-gradient(135deg, var(--accent-green), #81C784);
}

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

/* Footer avec fond noir et texte blanc */
footer {
    background-color: #000000 !important;
    color: #ffffff !important;
}

/* Liens du footer */
footer a {
    color: #ffffff !important;
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a:hover {
    color: #cccccc !important;
    text-decoration: underline;
}

/* Titres du footer */
footer h5,
footer h6 {
    color: #ffffff !important;
    font-weight: 600;
}

/* Texte secondaire */
footer .text-muted {
    color: #cccccc !important;
}

/* Formulaire newsletter */
footer input.form-control {
    background-color: #1a1a1a !important;
    border-color: #444444 !important;
    color: #ffffff !important;
}

footer input.form-control::placeholder {
    color: #888888 !important;
}

footer input.form-control:focus {
    background-color: #1a1a1a !important;
    border-color: #666666 !important;
    color: #ffffff !important;
    box-shadow: 0 0 0 0.2rem rgba(255, 255, 255, 0.1);
}


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

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

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

.pulse {
    animation: pulse 2s infinite;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section .display-4 {
        font-size: 2rem;
    }
    
    .page-header .display-5 {
        font-size: 1.75rem;
    }
    
    .card {
        margin-bottom: var(--spacing-md);
    }
    
    .btn-lg {
        padding: 0.5rem 1rem;
        font-size: 1rem;
    }
}

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

/* Focus styles */
.btn:focus,
.form-control:focus,
.form-select:focus,
.nav-link:focus {
    outline: 2px solid var(--accent-green);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .navbar,
    .btn,
    .sidebar,
    footer {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --white: #1a1a1a;
        --black: #ffffff;
        --light-gray: #2d2d2d;
    }
    
    .card {
        background-color: #2d2d2d;
        color: var(--black);
    }
    
    .form-control,
    .form-select {
        background-color: #3d3d3d;
        border-color: #4d4d4d;
        color: var(--black);
    }
}

/* Performance optimizations */
.will-change-transform {
    will-change: transform;
}

.gpu-accelerated {
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-gray);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-green);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--dark-green);
}

/* Loading states */
.loading {
    position: relative;
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-green);
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}