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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
}

header {
    background-color: #333;
    color: white;
    padding: 1rem;
    text-align: center;
}

header h1 {
    margin-bottom: 0.5rem;
}

nav a {
    color: white;
    margin: 0 15px;
    text-decoration: none;
}

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

main {
    padding: 1.5rem;
}

h2 {
    margin-bottom: 1rem;
}

.content {
    margin-bottom: 2rem;
}

img {
    max-width: 100%;
    height: auto;
    margin-top: 1rem;
}

.explanatory-cards {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
}

.card {
    background-color: #f0f0f0;
    padding: 1rem;
    width: 30%;
    text-align: center;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.3);
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}

footer p {
    margin: 0.5rem 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .explanatory-cards {
        flex-direction: column;
    }

    .card {
        width: 100%;
        margin-bottom: 1rem;
    }
}