body {
    margin: 0;
    background: #f6f7fb;
    color: #283142;
    font-family: system-ui, sans-serif;
    line-height: 1.8;
}
main {
    max-width: 720px;
    margin: 64px auto;
    padding: 32px;
    background: white;
    border-radius: 16px;
}
h1, h2 { line-height: 1.3; }