:root { color-scheme: light dark; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  line-height: 1.85;
  color: #1c1c1e;
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 42rem; margin: 0 auto; padding: 2.5rem 1.25rem 4rem; }

header.site { border-bottom: 1px solid #e3e3e8; padding-bottom: 1.1rem; margin-bottom: 1.8rem; }
header.site a { color: #6b6b70; text-decoration: none; font-size: 0.9rem; }

a { color: #0a6cd1; }
h1 { font-size: 1.6rem; line-height: 1.4; margin: 0 0 0.5rem; }
h2 { font-size: 1.18rem; margin: 2.3rem 0 0.6rem; }
p, li { font-size: 1rem; }
ul, ol { padding-left: 1.4rem; }
li { margin: 0.35rem 0; }

.subtitle { color: #6b6b70; margin: 0 0 2.2rem; }
.meta { color: #6b6b70; font-size: 0.9rem; margin: 0.15rem 0; }
.appname { font-size: 1.15rem; margin: 2.2rem 0 0.7rem; }
.appname a { text-decoration: none; }

.note { background: #f4f5f7; border: 1px solid #e3e3e8; border-radius: 12px; padding: 1rem 1.15rem; margin: 1.5rem 0; }

.qa { margin: 1.3rem 0; }
.qa .q { font-weight: 700; margin: 0 0 0.2rem; }
.qa .a { margin: 0; }

nav.cards a {
  display: block; padding: 1.05rem 1.15rem; border: 1px solid #e3e3e8;
  border-radius: 12px; margin-bottom: 0.8rem; text-decoration: none;
  color: #1c1c1e; font-weight: 700;
}
nav.cards a span { display: block; color: #6b6b70; font-size: 0.9rem; font-weight: 400; margin-top: 0.2rem; }

.backlinks { margin-top: 3rem; border-top: 1px solid #e3e3e8; padding-top: 1.3rem; font-size: 0.95rem; }
.backlinks a { margin-right: 1.4rem; display: inline-block; }

footer.site { margin-top: 3rem; color: #9a9aa0; font-size: 0.85rem; }

@media (prefers-color-scheme: dark) {
  body { color: #f2f2f7; background: #000; }
  header.site, .backlinks { border-color: #38383a; }
  header.site a { color: #a1a1a6; }
  a { color: #4c9dff; }
  .subtitle, .meta, nav.cards a span { color: #a1a1a6; }
  .note { background: #1c1c1e; border-color: #38383a; }
  nav.cards a { border-color: #38383a; color: #f2f2f7; }
  footer.site { color: #6b6b70; }
}