* { margin:0; padding:0; box-sizing:border-box; }
body {
  font-family: -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: #fafafa;
  color: #1a1a2e;
  line-height: 1.8;
}
.container { max-width: 720px; margin: 0 auto; padding: 0 20px; }

/* Nav */
nav {
  background: #fff;
  border-bottom: 1px solid #eaeaea;
  position: sticky; top: 0; z-index: 100;
}
.nav-inner {
  max-width: 720px; margin: 0 auto; padding: 16px 20px;
  display: flex; justify-content: space-between; align-items: center;
}
.logo { font-weight: 700; font-size: 1.1em; color: #1a1a2e; text-decoration: none; }
.nav-links a { margin-left: 24px; color: #666; text-decoration: none; font-size: 0.95em; }
.nav-links a:hover { color: #1a1a2e; }

/* Hero */
.hero { text-align: center; padding: 60px 0 40px; }
.hero h1 { font-size: 2em; font-weight: 700; color: #1a1a2e; }
.hero .subtitle { color: #888; margin-top: 8px; font-size: 1.05em; }

/* Posts */
.posts { margin: 40px 0; }
.posts h2 { font-size: 1.3em; margin-bottom: 20px; color: #333; border-bottom: 1px solid #eaeaea; padding-bottom: 10px; }
.post-item {
  padding: 20px 0;
  border-bottom: 1px solid #f0f0f0;
  cursor: pointer;
  transition: background 0.15s;
}
.post-item:hover { background: #f5f5f5; margin: 0 -20px; padding-left: 20px; padding-right: 20px; }
.post-item h3 { font-size: 1.15em; font-weight: 600; color: #1a1a2e; margin-bottom: 6px; }
.post-item .meta { font-size: 0.85em; color: #999; margin-bottom: 8px; }
.post-item .excerpt { font-size: 0.95em; color: #555; line-height: 1.6; }
.post-item .tags { margin-top: 8px; }
.tag {
  display: inline-block;
  background: #f0f0f0;
  color: #555;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.8em;
  margin-right: 6px;
  text-decoration: none;
}
.tag:hover { background: #e0e0e0; }

/* Footer */
footer { text-align: center; padding: 40px 20px; color: #aaa; font-size: 0.9em; border-top: 1px solid #eaeaea; margin-top: 60px; }

/* Article page */
.article { padding: 40px 0; }
.article .back { color: #666; text-decoration: none; font-size: 0.9em; display: inline-block; margin-bottom: 20px; }
.article .back:hover { color: #1a1a2e; }
.article h1 { font-size: 1.8em; margin-bottom: 10px; }
.article .meta { color: #999; font-size: 0.9em; margin-bottom: 30px; }
.article .content { font-size: 1em; color: #333; }
.article .content h2 { font-size: 1.4em; margin: 30px 0 15px; }
.article .content h3 { font-size: 1.2em; margin: 25px 0 12px; }
.article .content p { margin: 12px 0; }
.article .content pre {
  background: #1a1a2e; color: #e2e8f0; padding: 16px; border-radius: 8px;
  overflow-x: auto; font-size: 0.9em; margin: 16px 0; line-height: 1.5;
}
.article .content code { background: #f0f0f0; padding: 2px 6px; border-radius: 4px; font-size: 0.9em; }
.article .content pre code { background: none; padding: 0; }
.article .content ul, .article .content ol { padding-left: 24px; margin: 12px 0; }