:root { color-scheme: light dark; }

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    line-height: 1.5;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 1.5rem;
}

h1 { font-size: 1.5rem; }