:root {
  --color-bg: #fdfaf6;
  --color-surface: #ffffff;
  --color-text: #2e2a26;
  --color-muted: #7a7268;
  --color-border: #e8e1d6;
  --color-accent: #c17a4f;
  --color-accent-dark: #a35f38;
  --color-tag-bg: #f2e9dd;
  --color-notice-bg: #fbf3e6;
  --max-width: 880px;
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.85;
}

a { color: var(--color-accent-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; }

.site-header {
  text-align: center;
  padding: 2.5rem 1rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.site-header .tagline {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin: 0 0 0.6rem;
}

.site-header .site-title {
  font-size: 1.9rem;
  margin: 0;
  letter-spacing: 0.02em;
}

.site-header .site-title a {
  color: var(--color-text);
}

.site-nav {
  margin-top: 1rem;
  font-size: 0.85rem;
}

.site-nav a {
  margin: 0 0.6rem;
  color: var(--color-muted);
}

.wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.pr-notice {
  background: var(--color-notice-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 0.7rem 1rem;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.category-tag {
  display: inline-block;
  background: var(--color-tag-bg);
  color: var(--color-accent-dark);
  font-size: 0.75rem;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  margin-bottom: 0.6rem;
}

article h1 {
  font-size: 1.7rem;
  line-height: 1.5;
  margin: 0.4rem 0 0.6rem;
}

article h2 {
  font-size: 1.3rem;
  margin: 2.2rem 0 0.8rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--color-tag-bg);
}

article h3 {
  font-size: 1.08rem;
  margin: 1.6rem 0 0.6rem;
  color: var(--color-accent-dark);
}

article p, article li { font-size: 1rem; }

.post-date {
  color: var(--color-muted);
  font-size: 0.85rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  font-size: 0.92rem;
}

th, td {
  border: 1px solid var(--color-border);
  padding: 0.6rem 0.7rem;
  text-align: left;
}

th {
  background: var(--color-tag-bg);
}

.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-list li {
  border-bottom: 1px solid var(--color-border);
  padding: 1.4rem 0;
}

.post-list h2 {
  font-size: 1.15rem;
  margin: 0.2rem 0 0.4rem;
  border: none;
  padding: 0;
}

.post-list .excerpt {
  color: var(--color-muted);
  font-size: 0.92rem;
  margin: 0.3rem 0 0;
}

.related-posts {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.related-posts ul {
  list-style: none;
  padding: 0;
}

.related-posts li {
  margin-bottom: 0.5rem;
}

.site-footer {
  text-align: center;
  padding: 2rem 1rem;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.8rem;
}

.site-footer nav a {
  margin: 0 0.6rem;
  color: var(--color-muted);
}

.disclaimer-box {
  background: var(--color-notice-bg);
  border-left: 4px solid var(--color-accent);
  padding: 1rem 1.2rem;
  margin: 1.2rem 0;
  font-size: 0.92rem;
}