:root{font-family:system-ui,sans-serif;line-height:1.5;color-scheme:light dark}body{margin:0}.layout{max-width:60rem;margin:0 auto;padding:1.5rem;display:flex;flex-direction:column;gap:1.5rem;min-height:100vh}header h1{margin:0}nav{display:flex;gap:1rem;margin:.75rem 0}main{flex:1}footer .health{font-size:.875rem;opacity:.75}