:root {
  --bg: #f3f0e8;
  --ink: #231f1b;
  --muted: #5e584f;
  --line: #ddd4c6;
  --link: #1d4e72;
  --paper: #faf8f4;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Songti SC", "Noto Serif SC", "Source Han Serif SC", PMingLiU, Georgia, serif;
  font-size: 18px;
  line-height: 1.85;
}

a { color: var(--link); }

.wrap {
  max-width: 40rem;
  margin: 0 auto;
  padding: 2.75rem 1.35rem 0;
}

.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  color: var(--ink);
  text-decoration: none;
  font-size: 1.55rem;
  letter-spacing: 0.08em;
}

.brand:hover { color: var(--link); }

.site-header nav {
  display: flex;
  gap: 1.1rem;
  font-size: 0.95rem;
}

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-header nav a:hover { color: var(--link); }

.intro {
  margin: 2.2rem 0 2.4rem;
}

.intro h1 {
  margin: 0 0 0.35rem;
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

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

.post-list li {
  padding: 1.35rem 0;
  border-top: 1px solid var(--line);
}

.post-list time {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
  letter-spacing: 0.04em;
}

.post-list h2 {
  margin: 0.2rem 0 0.35rem;
  font-size: 1.28rem;
  font-weight: 600;
}

.post-list h2 a {
  color: var(--ink);
  text-decoration: none;
}

.post-list h2 a:hover { color: var(--link); }

.excerpt { margin: 0; color: var(--ink); }

article.post { margin-top: 2rem; }

article.post h1 {
  margin: 0.25rem 0 0.4rem;
  font-size: 1.85rem;
  font-weight: 600;
  line-height: 1.35;
}

article.post time {
  color: var(--muted);
  font-size: 0.9rem;
}

article.post p { margin: 1rem 0; }

.back {
  display: inline-block;
  margin-top: 1.6rem;
  font-size: 0.95rem;
}

.site-footer {
  margin-top: 3.5rem;
  padding: 1.35rem 0 2.4rem;
  border-top: 1px solid var(--line);
  text-align: center;
  font-size: 14px;
  line-height: 1.9;
  color: #3f3a34;
}

.site-footer p { margin: 0; }

.site-footer a {
  color: #1a1a1a;
  text-decoration: underline;
  text-underline-offset: 2px;
}

@media (max-width: 640px) {
  body { font-size: 17px; }
  .wrap { padding-top: 1.6rem; }
  .intro h1 { letter-spacing: 0.06em; }
  .site-header { align-items: flex-start; }
}