:root { color-scheme: light; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
body { margin: 0; background: #f5f7fb; color: #172033; line-height: 1.6; }
main { max-width: 820px; margin: 0 auto; padding: 3rem 1.25rem 4rem; }
header, footer { background: #102a43; color: #fff; padding: 1rem 1.25rem; }
header a, footer a { color: #fff; }
nav { max-width: 820px; margin: 0 auto; display: flex; gap: 1rem; flex-wrap: wrap; }
section { background: #fff; border-radius: 12px; padding: 1.25rem 1.5rem; margin: 1rem 0; box-shadow: 0 2px 10px rgba(16, 42, 67, .08); }
h1, h2 { line-height: 1.2; }
.muted { color: #52606d; }
code { background: #e9eef5; padding: .1rem .3rem; border-radius: 4px; }