:root {
  color-scheme: light;
}
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Hiragino Kaku Gothic ProN', 'Yu Gothic', 'Meiryo', sans-serif;
  line-height: 1.7;
  color: #111827;
  background: #f8fafc;
}
main {
  max-width: 860px;
  margin: 16px auto 40px;
  background: #ffffff;
  padding: 32px 40px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  border-radius: 16px;
}
h1 {
  font-size: 1.8rem;
  margin-top: 0;
  line-height: 1.4;
}
.meta {
  list-style: none;
  padding: 0;
  margin: 16px 0 28px;
  color: #475569;
  font-size: 0.95rem;
}
.meta li {
  margin-bottom: 6px;
}
.lead {
  font-size: 1.05rem;
  color: #1f2937;
  background: #f1f5f9;
  padding: 12px 16px;
  border-radius: 10px;
}
.article-body img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 18px auto;
  border-radius: 10px;
}
.article-body h2 {
  margin-top: 32px;
  font-size: 1.3rem;
}
a {
  color: #2563eb;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
footer {
  margin-top: 40px;
  font-size: 0.9rem;
  color: #64748b;
}
.site-header {
  max-width: 860px;
  margin: 24px auto 0;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.08);
  color: #64748b;
}
.site-logo {
  font-weight: 700;
  color: #0f172a;
  text-decoration: none;
}
.site-nav {
  display: flex;
  gap: 12px;
  font-size: 0.9rem;
}
.site-nav a {
  color: #2563eb;
  text-decoration: none;
}
.site-nav a:hover {
  text-decoration: underline;
}