/* Styles pour le header */
header {
    position: relative;
    top: 0;
    left: 0;
    width: 100%;
    background-color: #333;
    color: #fff;
    z-index: 1000;
}

header nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    padding: 24px;
    text-align: center;
    align-items: center;
}

header nav ul li {
    margin: 0 15px;
}

header nav ul li a {
    text-decoration: none;
    color: #fff;
    padding: 10px;
    transition: color 0.3s;
}

header nav ul li a:hover {
    color: #f1f1f1;
}

header nav ul li a.active {
    color: #e74c3c;
}