:root {
  color-scheme: light;
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
  line-height: 1.7;
  background-color: #f9f9fb;
  color: #1c1c1c;
}

body {
  margin: 0;
}

.site-header {
  background-color: #ffffff;
  border-bottom: 1px solid #e1e1e8;
  padding: 1.5rem 1.5rem 1rem;
}

.site-title {
  font-size: 1.5rem;
  margin: 0;
}

.site-title a {
  color: inherit;
  text-decoration: none;
}

.site-main {
  max-width: 780px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  background-color: #ffffff;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
}

.post-date {
  color: #666;
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

.post-content h2 {
  margin-top: 2rem;
}