/* --- VARIABLES ET COULEURS --- */
:root {
    --couleur-principale: #2c3e50; /* Bleu nuit */
    --couleur-secondaire: #1abc9c; /* Cyan/Turquoise */
    --couleur-fond: #ecf0f1;       /* Gris très clair */
    --couleur-texte: #333;
}

/* --- CONFIGURATION GÉNÉRALE --- */
html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--couleur-fond);
    color: var(--couleur-texte);
    line-height: 1.6;
}

h1, h2, h3 {
    color: var(--couleur-principale);
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style-type: none;
    padding-left: 0;
}

/* Classes utilitaires */
.conteneur {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-padding {
    padding: 80px 0;
}

/* --- HEADER (MENU) --- */
header {
    background-color: var(--couleur-principale);
    color: white;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    color: white;
    font-weight: 500;
    transition: color 0.3s;
}

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

/* --- SECTION ACCUEIL --- */
#accueil {
    height: 100vh;
    background: linear-gradient(rgba(44, 62, 80, 0.9), rgba(44, 62, 80, 0.9)), url('https://images.unsplash.com/photo-1517694712202-14dd9538aa97?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    background-position: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
}

#accueil h1 {
    color: white;
    font-size: 3rem;
    margin-bottom: 10px;
}

#accueil p {
    font-size: 1.5rem;
    margin-bottom: 30px;
}

.btn-commencer {
    padding: 12px 30px;
    background-color: var(--couleur-secondaire);
    color: white;
    border-radius: 5px;
    font-size: 1.1rem;
    transition: transform 0.3s;
}

.btn-commencer:hover {
    transform: scale(1.05);
    background-color: #16a085;
}

/* --- SECTION PRÉSENTATION --- */
.grille-parcours {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 30px;
}

.boite-parcours {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.liste-activites li {
    border-bottom: 1px solid #eee;
    padding: 10px 0;
}

.btn-certif {
    padding: 12px 30px;
    background-color: var(--couleur-secondaire);
    color: white;
    border-radius: 5px;
    font-size: 1.1rem;
    transition: transform 0.3s;
}

.btn-certif:hover {
    transform: scale(1.05);
    background-color: #16a085;
}

.entreprise-section {
    margin-top: 50px;
    background: white;
    padding: 30px;
    border-radius: 8px;
}

.photos-entreprise {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.photo-placeholder {
    width: 150px;
    height: 100px;
    background-color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.8rem;
}

/* --- SECTION FORMATION --- */
#formation {
    background-color: white;
}

.options-sio {
    display: flex;
    gap: 30px;
    margin-top: 30px;
}

.colonne-option {
    flex: 1;
    background-color: var(--couleur-fond);
    padding: 20px;
    border-radius: 8px;
    border-left: 5px solid var(--couleur-secondaire);
}

/* --- SECTIONS PROJETS & VEILLE --- */
.grille-cartes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.carte {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s;
    cursor: pointer;
}

.carte:hover {
    transform: translateY(-5px);
}

.carte-header {
    height: 150px;
    background-color: var(--couleur-principale);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.carte-corps {
    padding: 20px;
}

.carte-corps h3 {
    margin-bottom: 10px;
}

/* --- MODALES --- */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.8);
    backdrop-filter: blur(5px);
}

.modal-contenu {
    background-color: #fefefe;
    margin: 10% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 800px;
    border-radius: 10px;
    position: relative;
    animation: animatetop 0.4s;
}

@keyframes animatetop {
    from {top: -300px; opacity: 0}
    to {top: 0; opacity: 1}
}

.fermer-modal {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.fermer-modal:hover {
    color: black;
}

.btn-lien {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 20px;
    background-color: var(--couleur-principale);
    color: white;
    border-radius: 5px;
}

/* --- CONTACT --- */
#contact {
    background-color: var(--couleur-principale);
    color: white;
    text-align: center;
}

#contact h2 {
    color: white;
}

.icones-contact {
    font-size: 3rem;
    margin-top: 20px;
}

.icones-contact a {
    color: white;
    margin: 0 20px;
    transition: color 0.3s;
}

.icones-contact a:hover {
    color: var(--couleur-secondaire);
}

/* --- BOUTON RETOUR HAUT --- */
#btn-retour-haut {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 99;
    border: none;
    outline: none;
    background-color: var(--couleur-secondaire);
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 50%;
    font-size: 18px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
    display: none; /* Caché par défaut via CSS, géré par JS ensuite */
}

#btn-retour-haut:hover {
    background-color: #555;
}

/* --- RESPONSIVE MOBILE --- */
@media screen and (max-width: 768px) {
    .grille-parcours, .options-sio {
        grid-template-columns: 1fr;
        flex-direction: column;
    }
    nav ul {
        display: none; /* A remplacer par un menu burger idéalement */
    }
    .modal-contenu {
        width: 95%;
    }
}