:root { color-scheme: light dark; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Noto Sans JP", sans-serif; line-height: 1.8; }
body { margin: 0; color: #202124; background: #f7f8fa; }
main { box-sizing: border-box; max-width: 840px; min-height: 100vh; margin: 0 auto; padding: 48px 24px 80px; background: #fff; }
h1 { font-size: clamp(1.6rem, 5vw, 2rem); line-height: 1.4; }
h2 { margin-top: 2.2rem; font-size: 1.2rem; }
nav { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 24px 0 40px; }
a { color: #1769aa; overflow-wrap: anywhere; text-underline-offset: 3px; }
a:focus-visible, summary:focus-visible { outline: 3px solid #1769aa; outline-offset: 4px; }
.meta, .brand { color: #5f6368; font-size: .9rem; }
pre { overflow-wrap: anywhere; white-space: pre-wrap; font: inherit; }
details { border-bottom: 1px solid #dadce0; padding: 16px 0; }
summary { cursor: pointer; overflow-wrap: anywhere; font-weight: 600; }
footer { margin-top: 56px; padding-top: 24px; border-top: 1px solid #dadce0; }
@media (prefers-color-scheme: dark) {
  body, main { color: #e8eaed; background: #202124; }
  a { color: #8ab4f8; }
  .meta, .brand { color: #bdc1c6; }
  footer, details { border-color: #5f6368; }
}