*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.05rem;
  line-height: 1.7;
  color: #1a1a1a;
  background: #fafafa;
}

a {
  color: #2563eb;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  border-bottom: 1px solid #e5e5e5;
  background: #fff;
}

.site-header .inner,
main,
.site-footer .inner {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.25rem;
  padding-bottom: 1.25rem;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #1a1a1a;
  text-decoration: none;
}

.site-title:hover {
  text-decoration: none;
  color: #2563eb;
}

nav {
  display: flex;
  gap: 1.25rem;
  font-family: system-ui, sans-serif;
  font-size: 0.95rem;
}

nav a {
  color: #555;
}

nav a:hover,
nav a[aria-current="page"] {
  color: #1a1a1a;
}

main {
  padding-top: 2.5rem;
  padding-bottom: 3rem;
}

.intro {
  margin-bottom: 2.5rem;
  color: #444;
}

.intro h1 {
  font-size: 1.75rem;
  margin: 0 0 0.5rem;
  line-height: 1.3;
}

section > h2 {
  font-size: 1.1rem;
  font-family: system-ui, sans-serif;
  font-weight: 600;
  color: #555;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 0.75rem;
}

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

.post-list li {
  padding: 1.25rem 0;
  border-bottom: 1px solid #e5e5e5;
}

.post-list li:first-child {
  border-top: 1px solid #e5e5e5;
}

.post-list h2 {
  font-size: 1.2rem;
  margin: 0 0 0.35rem;
  font-weight: 600;
}

.post-meta {
  font-family: system-ui, sans-serif;
  font-size: 0.85rem;
  color: #888;
  margin-bottom: 0.35rem;
}

.post-excerpt {
  margin: 0;
  color: #555;
  font-size: 0.98rem;
}

article h1 {
  font-size: 1.85rem;
  margin: 0 0 0.5rem;
  line-height: 1.3;
}

article .post-meta {
  margin-bottom: 2rem;
}

article p {
  margin: 0 0 1.25rem;
}

article h2 {
  font-size: 1.25rem;
  margin: 2rem 0 0.75rem;
}

article ul {
  margin: 0 0 1.25rem;
  padding-left: 1.5rem;
}

article li {
  margin-bottom: 0.35rem;
}

.back-link {
  display: inline-block;
  margin-top: 2.5rem;
  font-family: system-ui, sans-serif;
  font-size: 0.95rem;
}

.site-footer {
  border-top: 1px solid #e5e5e5;
  padding: 1.5rem 0;
  font-family: system-ui, sans-serif;
  font-size: 0.85rem;
  color: #888;
  text-align: center;
}

.site-footer p {
  margin: 0;
}

.site-footer .beian {
  margin-top: 0.35rem;
}

.site-footer .beian a {
  color: #888;
  text-decoration: none;
}

.site-footer .beian a:hover {
  color: #555;
  text-decoration: underline;
}

.about-page h1 {
  font-size: 1.75rem;
  margin: 0 0 1.5rem;
}

@media (max-width: 600px) {
  .site-header .inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}