body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background: linear-gradient(90deg, #4b6cb7, #182848);
    color: white;
    padding: 10px 0;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    padding: 0;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
}

.container {
    display: flex;
    flex: 1;
}

.left {
    width: 15%;
    padding: 20px;
    background-color: #f4f4f4;
}

.right {
    width: 85%;
    padding: 20px;
}

footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 10px 0;
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    .left, .right {
        width: 100%;
    }
}