body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: url('ratio_mercatus_bg_visual.webp') no-repeat center center fixed;
    background-size: cover;
    color: #fff;
    text-align: center;
}

header {
    color: white;
    text-align: center;
    padding: 1em 0;
    background: rgba(0, 0, 0, 0.5); /* Fond semi-transparent pour lisibilité */
}

header img {
    max-width: 150px;
    height: auto;
}

header h1 {
    margin: 0.5em 0;
}

header p {
    margin: 0.5em 0 1em;
}

header .btn {
    background-color: #00e5ff;
    color: #0b0f1a;
    padding: 0.5em 1em;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: all 0.3s ease;
}

a.btn:hover {
    background: #8e24aa;
    color: white;
}

main {
    padding: 2em;
    background: rgba(0, 0, 0, 0.5);
}

section {
    margin-bottom: 2em;
}

h2 {
    color: #fff;
}

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

ul li {
    width: fit-content;
    display: inline-block;
    background-color: rgba(255, 255, 255, 0.8);
    color: #333;
    margin: 0.5em 0;
    padding: 1em;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

#contact p {
    width: fit-content;
    display: inline-block;
    background-color: rgba(255, 255, 255, 0.8);
    color: #333;
    padding: 1em;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
    header img {
        max-width: 100px;
    }
    main {
        padding: 1em;
    }
    ul li {
        display: block;
        width: auto;
        margin: 1em auto;
    }
}