header {
    background: #2c3e50;
    color: #fff;
    padding: 2rem 1rem;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1.2rem;
    color: #ddd;
}

nav {
    margin-top: 1rem;
}

nav a {
    margin: 0 10px;
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

nav a:hover {
    text-decoration: underline;
}

nav a.active {
    border-bottom: 2px solid #007bff;
    color: #007bff;
    font-weight: bold;
}