:root{--bg:#ffffff;--ink:#373c44;--ink-strong:#1e2229;--ink-2:#646b79;--rule:#dfe3eb;--blue:#0172ad}
@media (prefers-color-scheme:dark){:root{--bg:#13171f;--ink:#e0e3e7;--ink-strong:#f3f5f7;--ink-2:#a4a9b3;--rule:#2a3140;--blue:#01aaff}}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg);color:var(--ink);
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",sans-serif;font-size:16px;line-height:1.6}
main{max-width:34rem;padding:24px;text-align:left}
.mark{width:48px;height:48px;display:block;margin-bottom:20px}
h1{margin:0 0 .5rem;font-size:1.6rem;line-height:1.25;font-weight:600;color:var(--ink-strong)}
p{margin:0 0 1rem;color:var(--ink-2)}
a{color:var(--blue);text-underline-offset:.18em;text-decoration-thickness:1px}
a:focus-visible{outline:2px solid var(--blue);outline-offset:2px}