:root {
  --color-bg: #fbfaf7;
  --color-text: #2d2a26;
  --color-muted: #6b6660;
  --color-accent: #8b7355;
  --color-border: #e8e4dd;
  --color-card: #ffffff;
  --font: "Hiragino Sans", "ヒラギノ角ゴシック", "Yu Gothic", "游ゴシック", sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 720px; margin: 0 auto; padding: 0 20px; }
header.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 24px 0;
  background: var(--color-card);
}
header.site-header .container { display: flex; flex-direction: column; align-items: center; gap: 8px; }
header.site-header .site-title { font-size: 24px; font-weight: 700; margin: 0; color: var(--color-text); }
header.site-header .site-title a { color: inherit; }
header.site-header .site-tagline { color: var(--color-muted); font-size: 14px; margin: 0; }
nav.site-nav { padding: 14px 0; border-bottom: 1px solid var(--color-border); background: var(--color-card); }
nav.site-nav .container { display: flex; justify-content: center; gap: 28px; flex-wrap: wrap; }
nav.site-nav a { color: var(--color-text); font-size: 14px; }
main { padding: 40px 0 60px; }
.post-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 20px; }
.post-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 24px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.post-card:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(0,0,0,0.05); }
.post-card a { color: var(--color-text); display: block; }
.post-card a:hover { text-decoration: none; }
.post-card .date { font-size: 13px; color: var(--color-muted); margin-bottom: 8px; }
.post-card h2 { font-size: 18px; margin: 0; line-height: 1.5; font-weight: 600; }
article.post { background: var(--color-card); padding: 36px 32px; border-radius: 8px; border: 1px solid var(--color-border); }
article.post h1 { font-size: 24px; line-height: 1.5; margin: 0 0 8px; }
article.post .meta { color: var(--color-muted); font-size: 13px; margin-bottom: 28px; padding-bottom: 16px; border-bottom: 1px solid var(--color-border); }
article.post img { max-width: 100%; height: auto; border-radius: 4px; display: block; margin: 16px auto; }
article.post figure { margin: 20px 0; }
article.post figcaption { font-size: 13px; color: var(--color-muted); text-align: center; margin-top: 4px; }
article.post p { margin: 16px 0; }
article.post h2, article.post h3 { margin-top: 32px; font-weight: 600; }
article.post h2 { font-size: 20px; }
article.post h3 { font-size: 17px; }
article.post ul, article.post ol { padding-left: 24px; }
article.post li { margin: 6px 0; }
article.post blockquote { border-left: 3px solid var(--color-accent); padding: 4px 16px; margin: 20px 0; color: var(--color-muted); }
article.post hr { border: none; border-top: 1px solid var(--color-border); margin: 32px 0; }
.back-to-top { display: inline-block; margin-top: 40px; font-size: 14px; }
.contact-button {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  padding: 14px 28px;
  border-radius: 6px;
  font-weight: 600;
  margin-top: 12px;
}
.contact-button:hover { text-decoration: none; opacity: 0.9; color: #fff; }
footer.site-footer { border-top: 1px solid var(--color-border); padding: 28px 0; margin-top: 60px; background: var(--color-card); }
footer.site-footer .container { text-align: center; font-size: 13px; color: var(--color-muted); }
footer.site-footer a { color: var(--color-muted); margin: 0 8px; }
@media (max-width: 600px) {
  article.post { padding: 24px 20px; border-radius: 0; border-left: none; border-right: none; }
  article.post h1 { font-size: 20px; }
  header.site-header .site-title { font-size: 20px; }
  nav.site-nav .container { gap: 18px; }
}