body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

header {
    text-align: center;
    padding: 2rem 0;
    color: #4a5568;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

main {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
}