body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
       max-width: 920px; margin: 0 auto; padding: 32px 24px; line-height: 1.75; color: #1f2328; }
h1, h2, h3 { line-height: 1.3; margin-top: 1.6em; }
h1 { border-bottom: 2px solid #d0d7de; padding-bottom: .3em; }
h2 { border-bottom: 1px solid #d0d7de; padding-bottom: .3em; }
code { background: #f6f8fa; padding: 2px 6px; border-radius: 4px; font-size: .9em; }
pre { background: #f6f8fa; padding: 16px; border-radius: 8px; overflow-x: auto; }
pre code { background: none; padding: 0; }
table { border-collapse: collapse; width: 100%; margin: 1em 0; }
th, td { border: 1px solid #d0d7de; padding: 8px 12px; text-align: left; }
th { background: #f6f8fa; }
a { color: #0969da; text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
blockquote { border-left: 4px solid #d0d7de; margin: 0; padding-left: 16px; color: #57606a; }