* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.9;
  color: #2d3748;
  background: #f7f8fa;
  padding: 24px 16px;
}
.article {
  max-width: 760px;
  margin: 0 auto;
  background: #fff;
  border-radius: 14px;
  padding: 40px 32px;
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
}
.article h1 { font-size: 28px; margin: 0 0 20px; color: #1a202c; }
.article h2 { font-size: 22px; margin: 28px 0 14px; border-left: 4px solid #667eea; padding-left: 12px; color: #1a202c; }
.article h3 { font-size: 18px; margin: 22px 0 10px; color: #2d3748; }
.article p { margin: 14px 0; }
.article img { max-width: 100%; height: auto; border-radius: 8px; margin: 16px 0; }
.article table { width: 100%; border-collapse: collapse; margin: 16px 0; }
.article th, .article td { border: 1px solid #e2e8f0; padding: 10px 12px; text-align: left; }
.article th { background: #f7f8fa; font-weight: 600; }
.article code { background: #f1f5f9; padding: 2px 6px; border-radius: 4px; font-size: 90%; }
.article pre { background: #1a202c; color: #e2e8f0; padding: 16px; border-radius: 8px; overflow-x: auto; margin: 16px 0; }
.article blockquote { border-left: 4px solid #cbd5e0; padding: 8px 16px; margin: 16px 0; color: #718096; background: #f7f8fa; border-radius: 4px; }
.article ul, .article ol { margin: 14px 0 14px 24px; }
.article li { margin: 6px 0; }

/* 顶部导航 */
.topnav { max-width: 760px; margin: 0 auto 16px; padding: 0 8px; }
.topnav a { color: #667eea; text-decoration: none; font-size: 14px; font-weight: 500; }
.topnav a:hover { text-decoration: underline; }

/* 首页 */
.hero { max-width: 760px; margin: 0 auto 32px; text-align: center; padding: 48px 0 24px; }
.hero h1 { font-size: 36px; margin-bottom: 12px; color: #1a202c; }
.hero p { color: #718096; font-size: 15px; }
.list { max-width: 760px; margin: 0 auto; }
.post {
  display: block;
  padding: 22px 26px;
  margin-bottom: 14px;
  background: #fff;
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 2px 8px rgba(0,0,0,.06);
  transition: .2s;
}
.post:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(0,0,0,.1); }
.post h2 { font-size: 19px; margin: 0 0 8px; color: #2d3748; }
.post .meta { font-size: 13px; color: #a0aec0; }
footer { text-align: center; padding: 32px 0 24px; color: #a0aec0; font-size: 13px; }
footer a { color: #667eea; text-decoration: none; }