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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    border-bottom: 1px solid #e0e0e0;
    padding-bottom: 20px;
    margin-bottom: 40px;
}

nav h1 {
    font-size: 1.8em;
    font-weight: 600;
    color: #222;
}

main {
    margin-bottom: 60px;
}

section {
    margin-bottom: 40px;
}

h2 {
    font-size: 1.5em;
    font-weight: 600;
    margin-bottom: 15px;
    color: #222;
}

p {
    margin-bottom: 15px;
    color: #555;
}

.intro {
    font-size: 1.1em;
}

footer {
    border-top: 1px solid #e0e0e0;
    padding-top: 20px;
    text-align: center;
    color: #888;
    font-size: 0.9em;
}

@media (max-width: 600px) {
    body {
        padding: 15px;
    }
    
    nav h1 {
        font-size: 1.5em;
    }
    
    h2 {
        font-size: 1.3em;
    }
}