* { margin: 0; padding: 0; box-sizing: border-box; }

body { font-family: Arial, sans-serif; }

.navbar {

    position: fixed;

    top: 0;

    left: 0;

    width: 100%;

    background-color: #333;

    color: white;

    display: flex;

    justify-content: space-between;

    align-items: center;

    padding: 15px 20px;

    transition: background-color 0.3s ease;

    z-index: 1000;

}

.navbar ul {

    list-style: none;

    display: flex;

}

.navbar ul li { margin: 0 15px; }

.navbar ul li a {

    color: white;

    text-decoration: none;

    font-weight: bold;

}

.navbar ul li a:hover { color: #ddd; }

.navbar.scrolled { background-color: #007bff; }

#content {

    padding: 80px 20px 20px;

    min-height: 100vh;

}

.page {

    display: none;

    animation: fadeIn 0.5s;

}

.page.active { display: block; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

@media (max-width: 768px) {

    .navbar ul { flex-direction: column; position: absolute; top: 100%; left: 0; width: 100%; background: #333; }

    .navbar ul li { margin: 0; }

    .navbar ul li a { padding: 15px; display: block; }

}