:root { color-scheme: light dark; --fg: #1b1f24; --bg: #f6f8fa; --muted: #57606a; }
@media (prefers-color-scheme: dark) { :root { --fg: #e6edf3; --bg: #0d1117; --muted: #8b949e; } }
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { display: grid; place-items: center; background: var(--bg); color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; padding: 16px; }
main { text-align: center; }
h1 { font-size: 2.5rem; margin: 0 0 .5rem; letter-spacing: .02em; }
p { margin: .25rem 0; font-size: 1.125rem; }
.ambiente { color: var(--muted); font-size: .875rem; text-transform: uppercase; letter-spacing: .1em; }