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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.banner {
    background-color: #4a90e2;
    color: white;
    padding: 2rem;
    text-align: center;
    font-size: clamp(1.5rem, 4vw, 3rem);
}

main {
    flex: 1;
    padding: 2rem;
    max-width: 800px;
    margin: 0 auto;
    width: 90%;
    text-align: center;
}

h1 {
    color: #333;
    margin-bottom: 1rem;
    font-size: clamp(1.2rem, 3vw, 2rem);
}

p {
    color: #666;
    font-size: clamp(1rem, 2vw, 1.2rem);
}

.world-image {
    width: 50%;
    height: 50%;
    max-width: 400px;
    max-height: 400px;
    margin: 2rem auto;
    display: block;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

footer {
    background-color: #f5f5f5;
    padding: 2rem;
    text-align: center;
    font-size: clamp(0.8rem, 1.5vw, 1rem);
    color: #777;
    font-style: italic;
}

@media (max-width: 600px) {
    .banner, main, footer {
        padding: 1rem;
    }
}