/* Variables pour la personnalisation */
:root {
    --primary-color: #3498db;  /* Bleu */
    --secondary-color: #2ecc71; /* Vert */
    --text-color: #333;
    --background-color: #f4f4f4;
    --header-height: 60px;
    --footer-height: 40px;
    --font-family: 'Roboto', sans-serif;
}

/* Corps de la page */
body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
}

/* En-tête */
header {
    background-color: var(--primary-color);
    color: white;
    padding: 20px;
    height: var(--header-height);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

header nav {
    display: flex;
    justify-content: space-between;
}

header nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    gap: 20px;
}

header nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

/* Section principale */
main {
    padding-top: var(--header-height);
    padding-bottom: var(--footer-height);
}

/* Pied de page */
footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 10px;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
}

/* Responsive */
@media (max-width: 768px) {
    header nav ul {
        flex-direction: column;
        align-items: center;
    }

    main {
        padding-top: calc(var(--header-height) + 20px);
    }
}