:root { color-scheme: light dark; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: Canvas; color: CanvasText; }
.card { width: min(38rem, calc(100% - 3rem)); padding: 2rem; border: 1px solid color-mix(in srgb, CanvasText 16%, transparent); border-radius: 14px; }
h1 { margin-top: 0; font-size: 1.8rem; }
.muted { opacity: .65; }