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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background: #2c3e50;
    color: white;
    padding: 2rem 1rem;
    text-align: center;
}

main {
    flex: 1;
    padding: 2rem 1rem;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 1rem;
}