body {
  font-family: system-ui, sans-serif;
  margin: 0;
  background: #171717; /* Vercel black: どこ由来の配信か一目で分かるように */
  color: #1d1d1d;
}
/* junction-main の GlobalHeader を模した共通ヘッダー（静的コピー） */
.SiteHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  font-size: 14px;
  background: #eee;
}
.SiteHeader .logo {
  font-weight: 600;
  color: #1d1d1d;
  text-decoration: none;
}
.SiteHeader nav {
  display: flex;
  gap: 20px;
}
.SiteHeader nav a {
  color: #1d1d1d;
  text-decoration: none;
}
.SiteHeader nav a:hover {
  text-decoration: underline;
}
.SiteHeader nav a[aria-current] {
  font-weight: 700;
}
main {
  max-width: 42rem;
  margin: 10vh auto;
  background: #fff;
  padding: 2rem;
  border-radius: 8px;
}
.origin { font-size: 0.9rem; color: #555; }
code { background: #eee; padding: 0.1em 0.3em; border-radius: 3px; }