* {
    box-sizing: border-box;
}

body {
    max-width: 900px;
    margin: 0 auto;
    padding: 24px;
    font-family: system-ui, sans-serif;
    line-height: 1.6;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    padding: 16px 0;
    border-bottom: 1px solid #ccc;
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

main {
    padding: 32px 0;
}

footer {
    margin-top: 32px;
    padding: 16px 0;
    border-top: 1px solid #ccc;
}