:root {
  color-scheme: dark light;
  --bg: #0b0f1a;
  --fg: #e6e9f0;
  --muted: #9aa3b5;
  --accent: #8ab4ff;
}
@media (prefers-color-scheme: light) {
  :root { --bg: #f7f8fb; --fg: #101321; --muted: #5b6474; --accent: #2456c9; }
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 24px 16px;
}
main { max-width: 36rem; text-align: center; }
.mark { color: var(--accent); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: 0.04em; margin: 0 0 1rem; }
h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); font-weight: 600; margin: 0 0 0.75rem; }
p { margin: 0.5rem 0; color: var(--muted); }
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }