/* Fichier: styles.css (Design Professionnel V3 - Style Institutionnel RDC) */

/* --- PALETTE GLOBALE (Inspirée du Logo) --- */
:root {
    --color-primary: #99A9C2; /* Bleu-Gris */
    --color-accent1: #45B6C4; /* Bleu Ciel / Cyan (Principal pour l'action) */
    --color-accent2: #F9C86E; /* Jaune Pâle (Secondaire pour l'attention) */
    --color-dark: #1C1C1C; /* Texte Noir / Fond Footer */
    --color-light: white; /* Fond Principal */
    --color-background-subtle: #F9FAFC; /* Gris très léger pour alterner les sections */
    --shadow-subtle: 0 4px 12px rgba(0, 0, 0, 0.08); 
    --shadow-medium: 0 8px 15px rgba(0, 0, 0, 0.1); /* Ombre plus nette et moins diffuse */
    --border-radius-card: 4px; /* Petit rayon pour un look institutionnel */
}

/* --- 0. RESET ET TYPOGRAPHIE --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.7; 
    background-color: var(--color-light); 
    color: var(--color-dark);
    scroll-behavior: smooth;
}

.container {
    width: 90%; 
    max-width: 1280px;
    margin: 0 auto;
    padding: 30px 0; /* Plus d'espace vertical */
}

h1 {
    font-size: 4.5em; 
    font-weight: 900;
}

h2 {
    font-size: 2.5em; 
    font-weight: 700;
    color: var(--color-dark);
    text-align: center;
    margin-bottom: 50px;
    position: relative;
    padding-bottom: 10px;
    text-transform: uppercase; /* Effet institutionnel */
    letter-spacing: 1px;
}

/* Soulignement élégant et affirmé des titres H2 */
h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px; /* Ligne un peu plus longue */
    height: 4px;
    background-color: var(--color-accent1);
    border-radius: 2px;
}

h3 {
    font-size: 1.6em;
    font-weight: 700;
    color: var(--color-dark); 
}

/* --- 1. EN-TÊTE ET NAVIGATION (Plus imposant) --- */
.main-header {
    background: var(--color-light); 
    /* Ligne supérieure forte */
    border-top: 5px solid var(--color-primary); 
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1); 
    position: sticky; 
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;              
    justify-content: space-between; 
    align-items: center;        
    padding: 15px 0; 
}

.logo-img {
    height: 75px; 
    width: auto;
    display: block;
    margin-right: 40px; 
}

nav ul {
    list-style: none;
    display: flex; 
    gap: 30px; 
}

nav ul li a {
    color: var(--color-dark);
    text-decoration: none;
    padding: 12px 0;
    font-weight: 500;
    font-size: 1.05em;
    text-transform: uppercase;
    position: relative;
    transition: color 0.3s;
}

/* Soulignement actif et moderne */
nav ul li a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--color-accent1);
    transition: width 0.3s ease-in-out;
}

nav ul li a:hover {
    color: var(--color-accent1);
}

nav ul li a:hover::after {
    width: 100%;
}

/* --- 2. SECTION BANNIÈRE (HERO) --- */
.hero-section {
    background: linear-gradient(rgba(28, 28, 28, 0.75), rgba(28, 28, 28, 0.75)), url('assets/research_bg.jpg') no-repeat center center/cover;
    height: 80vh; 
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--color-light);
    /* Ligne de démarcation jaune épaisse pour attirer l'attention */
    border-bottom: 10px solid var(--color-accent2); 
}

.hero-content h1 {
    font-size: 5em; 
    font-weight: 900;
    color: var(--color-light);
    margin-bottom: 0.3em;
    text-shadow: 0 3px 6px rgba(0, 0, 0, 0.7);
    line-height: 1.1;
}

.hero-content p {
    font-size: 1.8em;
    font-weight: 300;
    margin-bottom: 3em;
}

/* --- 3. BOUTONS ET ACTIONS (Plus carrés) --- */
.btn-primary {
    background-color: var(--color-accent1); 
    color: var(--color-light);
    padding: 20px 50px; /* Encore plus grand */
    border-radius: var(--border-radius-card); 
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s;
    box-shadow: 0 4px 10px rgba(69, 182, 196, 0.4);
    text-decoration: none;
    display: inline-block;
    border: none;
    font-size: 1.1em;
}

.btn-primary:hover {
    background-color: #3895A2;
    transform: translateY(-2px); 
    box-shadow: 0 6px 15px rgba(69, 182, 196, 0.6);
}

.btn-secondary {
    border: 2px solid var(--color-accent2); 
    color: var(--color-dark);
    padding: 15px 35px;
    border-radius: var(--border-radius-card);
    display: inline-block;
    margin-top: 20px;
    font-weight: 500;
    transition: background-color 0.3s, color 0.3s;
    text-decoration: none;
    text-transform: uppercase;
}

.btn-secondary:hover {
    background-color: var(--color-accent2);
    color: var(--color-dark);
}

/* --- 4. SECTIONS DE CONTENU --- */

/* Section d'information clé (Rendu plus bloc) */
.info-centre-section {
    padding: 60px 0; 
    background-color: var(--color-background-subtle); 
    border-bottom: 2px solid #e0e0e0;
}

.info-centre-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    text-align: center;
}

.info-item {
    background: var(--color-light);
    padding: 35px; 
    border-radius: var(--border-radius-card); 
    box-shadow: var(--shadow-medium); 
    border-top: 6px solid var(--color-primary); /* Ligne d'accentuation plus épaisse */
    transition: transform 0.3s;
    min-height: 180px; 
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.info-item:hover {
    transform: translateY(-3px);
}

.info-item h3 {
    color: var(--color-accent1);
    margin-bottom: 10px;
    font-size: 1.5em;
    text-transform: uppercase;
}

.info-item a {
    color: var(--color-dark);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px dashed var(--color-accent1);
}
.info-item a:hover {
    color: var(--color-accent1);
}

.hidden {
    display: none;
}

/* Section Coordinateur / À Propos */
.coordinator-section {
    padding: 100px 0; 
    background-color: var(--color-light);
}

.apropos-intro {
    text-align: center;
    max-width: 900px;
    margin: 0 auto 60px auto;
    font-size: 1.2em;
    color: var(--color-dark);
    line-height: 1.7;
}

.coordinator-card {
    display: flex;
    gap: 50px;
    padding: 50px; 
    border-radius: var(--border-radius-card); 
    background: var(--color-background-subtle);
    box-shadow: var(--shadow-medium); 
    border-left: 10px solid var(--color-accent1); /* Bordure institutionnelle plus épaisse */
    transition: transform 0.4s ease;
}

.coordinator-card:hover {
    transform: translateY(-5px); 
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.coordinator-img {
    width: 220px; 
    height: 220px;
    border-radius: 50%;
    object-fit: cover;
    border: 6px solid var(--color-accent2); 
    flex-shrink: 0;
}

.coordinator-info h3 {
    color: var(--color-dark);
    font-weight: 700;
    margin-bottom: 5px;
}

.coordinator-info .role {
    color: var(--color-accent1);
    font-weight: 500;
    margin-bottom: 25px;
    font-size: 1.1em;
    display: block;
    text-transform: uppercase;
}

/* Section Mission et Objectifs */
.objectifs-section {
    padding: 100px 0;
    background-color: var(--color-background-subtle); 
}

.mission-vision {
    padding: 50px; 
    border-radius: var(--border-radius-card); 
    box-shadow: var(--shadow-subtle); 
    background-color: var(--color-light); 
}

.mission-vision h3 {
    color: var(--color-dark); 
    margin-top: 0;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid var(--color-accent1); 
    display: inline-block;
    font-size: 1.9em;
    text-transform: uppercase;
}

.mission-text {
    font-size: 1.2em;
    line-height: 1.8;
    margin-bottom: 40px;
    font-weight: 500; 
    border-left: 5px solid var(--color-accent2);
    padding-left: 20px;
}

.objectifs-list {
    list-style: none;
    padding: 0;
    margin-top: 20px;
    display: grid;
    grid-template-columns: 1fr 1fr; 
    gap: 20px; 
}

.objectifs-list li {
    background: #ffffff;
    padding: 18px 25px; 
    border: 1px solid #D0D0D0; 
    border-radius: var(--border-radius-card);
    box-shadow: none; 
    font-weight: 400;
    line-height: 1.5;
    transition: all 0.2s;
}

.objectifs-list li:hover {
    border: 1px solid var(--color-accent1);
}

.objectifs-list li:before {
    content: '➔'; 
    margin-right: 12px;
    font-weight: 900;
    color: var(--color-accent1); /* Utiliser le Cyan pour la puce */
    font-size: 1.2em;
    line-height: 1;
    display: inline-block;
    width: 15px; 
}

/* Section Projets */
.project-section {
    padding: 100px 0; 
    background-color: var(--color-light); 
}

.project-card {
    background: var(--color-background-subtle);
    padding: 45px;
    border-radius: var(--border-radius-card);
    border-left: 10px solid var(--color-accent2); /* Ligne jaune épaisse */
    box-shadow: var(--shadow-medium);
    transition: box-shadow 0.3s, transform 0.3s;
    max-width: 900px;
    margin: 0 auto;
}

.project-card:hover {
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
    transform: translateY(-4px);
}

.project-card h3 {
    color: var(--color-accent1); 
    font-weight: 700;
    margin-bottom: 10px;
    font-size: 1.8em;
    text-transform: uppercase;
}

.project-card .date {
    font-style: italic;
    color: #666;
    margin-bottom: 15px;
}

/* --- 5. PIED DE PAGE --- */
.main-footer {
    background-color: var(--color-dark); 
    color: var(--color-light);
    padding: 60px 0; 
    font-size: 1em;
}

.footer-grid {
    display: grid;
    grid-template-areas: 
        "info map"
        "copyright copyright";
    grid-template-columns: 1fr 1.5fr; 
    gap: 40px;
    padding-top: 0; 
    padding-bottom: 0; 
}

.footer-info h3, .footer-map h3 {
    color: var(--color-accent2); 
    margin-bottom: 15px;
    font-size: 1.4em;
    text-transform: uppercase;
}

.footer-info p {
    margin-bottom: 8px;
}

.footer-info a {
    color: var(--color-accent1);
    text-decoration: none;
    border-bottom: 1px dotted var(--color-accent1);
}

.footer-info a:hover {
    color: var(--color-accent2);
}

.footer-copyright {
    grid-area: copyright;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 25px;
    margin-top: 30px;
}

/* Règle pour l'adaptabilité sur petits écrans */
@media (max-width: 992px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }

    nav ul {
        justify-content: center;
        margin-top: 10px;
        flex-wrap: wrap;
    }

    .hero-content h1 {
        font-size: 2.8em;
    }

    .coordinator-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.2em;
    }
    .hero-content p {
        font-size: 1.3em;
    }
    .info-item {
        min-height: auto;
    }
    .objectifs-list {
        grid-template-columns: 1fr; 
    }
    .footer-grid {
        grid-template-areas: 
            "info"
            "map"
            "copyright";
        grid-template-columns: 1fr;
        text-align: center;
    }
}