body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}
header {
    background: linear-gradient(90deg, #4a90e2, #0056b3);
    color: #fff;
    padding: 20px;
    text-align: center;
    position: relative;
}
header img {
    position: absolute;
    top: 10px;
    left: 50px;
    width: 100px !important; /* Force la taille */
    height: auto !important; /* Conserve les proportions */
    cursor: pointer;
}
header h1 {
    margin: 0;
    font-size: 2.5em;
}
header p {
    margin: 5px 0 0;
    font-size: 1.2em;
}
nav {
    background: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 10px 0;
    text-align: center;
}
nav a {
    margin: 0 15px;
    text-decoration: none;
    color: #4a90e2;
    font-weight: bold;
}
nav a:hover {
    text-decoration: underline;
    color: #003366;
}
.container {
    padding: 20px;
    max-width: 1000px;
    margin: 20px auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}
footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 10px;
    margin-top: 20px;
}
button {
    padding: 10px 20px;
    background: #4a90e2;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
button:hover {
    background: #003366;
}