* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
  color: #1f2328;
  background: #ffffff;
}
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2rem;
  border-bottom: 1px solid #e5e7eb;
}
.site-title {
  font-weight: 700;
  font-size: 1.25rem;
  color: inherit;
  text-decoration: none;
}
.site-header nav a {
  margin-left: 1.5rem;
  color: #1f2328;
  text-decoration: none;
}
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}
.hero h1 {
  font-size: 2rem;
}
.post-list, .news-preview ul {
  list-style: none;
  padding: 0;
}
.post-list li, .news-preview li {
  padding: 0.5rem 0;
  border-bottom: 1px solid #f0f0f0;
}
.site-footer {
  text-align: center;
  padding: 2rem 0;
  color: #6b7280;
  font-size: 0.875rem;
}