:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body {
  margin: 0; padding: 0 1.25rem 4rem;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.8; color: #15202b; background: #fff;
  -webkit-text-size-adjust: 100%;
}
main { max-width: 42rem; margin: 0 auto; }
header { padding: 2.5rem 0 1.5rem; border-bottom: 1px solid #e3e8ee; margin-bottom: 2rem; }
.eyebrow { margin: 0 0 .75rem; font-size: .9rem; letter-spacing: .02em; }
.eyebrow a { text-decoration: none; }
h1 { font-size: 1.6rem; margin: 0 0 .25rem; letter-spacing: -.01em; }
.sub { margin: 0; color: #5b6b7c; font-size: .9rem; }
h2 { font-size: 1.1rem; margin: 2.25rem 0 .6rem; }
h3 { font-size: 1rem; margin: 1.5rem 0 .4rem; }
p, ul, ol { margin: .6rem 0; }
ul, ol { padding-left: 1.3rem; }
li { margin: .3rem 0; }
a { color: #0b5cab; }
hr { border: 0; border-top: 1px solid #e3e8ee; margin: 3rem 0 0; }
nav ul { list-style: none; padding: 0; }
nav li { margin: .5rem 0; }
dl { margin: .6rem 0; }
dt { font-weight: 600; margin-top: 1.1rem; }
dd { margin: .2rem 0 0; padding-left: 0; }
footer { margin-top: 3.5rem; padding-top: 1.25rem; border-top: 1px solid #e3e8ee; color: #5b6b7c; font-size: .85rem; }
@media (prefers-color-scheme: dark) {
  body { color: #e6edf3; background: #11161c; }
  header, footer, hr { border-color: #2a3340; }
  .sub, footer { color: #9bb0c3; }
  a { color: #7cc0ff; }
}