:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  color: #18302e;
  background: #f7f8f5;
  font-synthesis: none;
}
* { box-sizing: border-box; }
body { margin: 0; font-size: 16px; line-height: 1.85; }
.skip-link { position: absolute; top: 8px; left: 16px; padding: 8px 16px; background: #fff; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
main { width: min(100% - 48px, 760px); margin: 56px auto 32px; }
header { border-bottom: 1px solid #cfd9d4; padding-bottom: 24px; margin-bottom: 28px; }
.brand { font-weight: 700; font-size: 13px; letter-spacing: .12em; color: #3b6158; }
h1 { font-size: clamp(25px, 4.5vw, 34px); line-height: 1.45; margin: 18px 0 12px; }
.lead { margin-bottom: 12px; }
.updated { color: #50635e; font-size: 14px; }
section { margin-top: 36px; }
h2 { font-size: 21px; line-height: 1.6; margin: 0 0 12px; }
h1, h2 { text-wrap: balance; scroll-margin-top: 24px; }
p { margin: 0 0 16px; overflow-wrap: anywhere; }
a { color: #14685a; text-decoration-thickness: 1px; text-underline-offset: .2em; touch-action: manipulation; }
a:hover { color: #0a4339; }
a:focus-visible { outline: 3px solid #23796b; outline-offset: 4px; border-radius: 2px; }
footer { border-top: 1px solid #cfd9d4; padding-top: 20px; margin-top: 40px; font-size: 13px; color: #50635e; }
@media (max-width: 480px) {
  main { width: calc(100% - 36px); margin-top: 28px; }
  h2 { font-size: 19px; }
  section { margin-top: 28px; }
}