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

body {
    line-height: 1.6;
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f7f7f7;
    color: #333;
    padding-bottom: 40px;
}

header {
    background: #1a1a1a;
    color: #fff;
    padding: 20px 10px;
    text-align: center;
}

nav ul {
    display: flex;
    justify-content: center;
    background: #333;
    list-style: none;
}

nav ul li {
    margin: 0 20px;
}

nav ul li a {
    color: white;
    font-weight: bold;
    padding: 10px;
    display: block;
    text-decoration: none;
}

nav ul li a:hover,
nav ul li a.active {
    background: #555;
}

main {
    max-width: 900px;
    margin: 20px auto;
    padding: 10px;
}

/* Images */
figure {
    margin: 20px 0;
    text-align: center;
}

figure img {
    max-width: 100%;
    border-radius: 8px;
}

figcaption {
    margin-top: 5px;
    font-size: 0.9em;
    color: #555;
}

.animated-box {
    width: 100px;
    height: 100px;
    margin: 20px auto;
    background: linear-gradient(45deg, #4CAF50, #00BCD4);
    border-radius: 10px;
    animation: spin 4s infinite linear;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    background: #1a1a1a;
    color: #fff;
}

@media (max-width: 600px) {
    nav ul {
        flex-direction: column;
    }
}