*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: system-ui, sans-serif; background: #f9fafb; color: #111; display: flex; min-height: 100vh; align-items: center; justify-content: center; }
main { text-align: center; padding: 2rem; }
h1 { font-size: 2.5rem; margin-bottom: 1rem; }
p { color: #555; margin-bottom: 0.5rem; }
code { background: #e5e7eb; padding: 0.2rem 0.4rem; border-radius: 4px; }
a { color: #2563eb; text-decoration: none; }