body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f5f5f5;
    color: #333;
}
header {
    background-color: #1E90FF;
    color: white;
    padding: 10px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}
header .logo {
    display: flex;
    align-items: center;
}
header .logo span {
    font-size: 1.5rem;
    font-weight: bold;
    margin-left: 10px;
}
nav ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
}
nav ul li {
    margin: 0 10px;
}
nav ul li a {
    color: white;
    text-decoration: none;
}
nav ul li a.active {
    color: #FFD700;
    font-weight: bold;
    border-bottom: 2px solid #FFD700;
}
main {
    padding: 20px;
}
section {
    max-width: 900px;
    margin: auto;
}
footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 15px 20px;
}
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 2rem;
    color: white;
    cursor: pointer;
    margin-right: 10px;
}
@media (max-width: 768px) {
    nav ul {
        display: none;
        flex-direction: column;
        background-color: #333;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        padding: 0;
        margin: 0;
    }
    nav ul.open {
        display: flex;
    }
    nav ul li {
        text-align: center;
        margin: 10px 0;
    }
    .menu-toggle {
        display: block;
    }
}