:root { color-scheme: light dark; font-family: system-ui, sans-serif; line-height: 1.8; }
body { margin: 0; background: #f7f8fa; color: #18202a; }
main { max-width: 48rem; margin: auto; padding: 1.5rem; overflow-wrap: anywhere; }
h1 { line-height: 1.4; font-size: clamp(1.7rem, 5vw, 2.4rem); }
h2 { margin-top: 2rem; font-size: 1.3rem; }
a { color: #084eab; text-underline-offset: .2em; }
a:focus-visible { outline: 3px solid currentColor; outline-offset: 4px; }
.notice { padding: 1rem; border: 2px solid #876400; background: #fff3ce; color: #463400; }
nav { border-top: 1px solid #89929d; margin-top: 2rem; padding-top: 1rem; }
@media (prefers-color-scheme: dark) {
  body { background: #14181e; color: #eef2f6; }
  a { color: #91c4ff; }
}