/* Mobile-first base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    padding: 1rem;
}

header {
    margin-bottom: 2rem;
}

header h1 {
    font-size: 1.5rem;
}

main {
    min-height: 60vh;
}

footer {
    margin-top: 3rem;
    padding-top: 1rem;
    border-top: 1px solid #ddd;
    font-size: 0.9rem;
    color: #666;
}

/* Tablet and up */
@media (min-width: 768px) {
    body {
        padding: 2rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
}

/* Desktop */
@media (min-width: 1024px) {
    body {
        max-width: 1200px;
        margin: 0 auto;
    }
}