:root {
  --fg: #24292f;
  --muted: #57606a;
  --accent: #0969da;
  --line: #d0d7de;
  --bg: #ffffff;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 0 20px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-weight: 700; font-size: 18px; color: var(--fg); }
.site-header nav a { margin-left: 18px; color: var(--muted); font-size: 15px; }

.intro { color: var(--muted); margin: 32px 0 8px; }
.posts { margin: 8px 0 48px; }
.post-card { padding: 20px 0; border-bottom: 1px solid var(--line); }
.post-card h2 { margin: 0 0 6px; font-size: 20px; }
.post-card .meta { color: var(--muted); font-size: 13px; margin: 0 0 8px; }
.post-card p { margin: 0; color: #3b434b; }

article.full h1 { margin: 36px 0 4px; font-size: 26px; }
article.full .meta { color: var(--muted); font-size: 13px; margin-bottom: 24px; }
article.full h2 { margin-top: 32px; font-size: 20px; }
article.full pre {
  background: #f6f8fa; border: 1px solid var(--line); border-radius: 6px;
  padding: 14px 16px; overflow: auto; font-size: 13.5px; line-height: 1.5;
}
article.full code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: #f6f8fa; padding: 2px 5px; border-radius: 4px; font-size: 13.5px;
}
article.full pre code { background: none; padding: 0; }
.back { display: inline-block; margin: 40px 0 0; color: var(--muted); }

.site-footer { border-top: 1px solid var(--line); margin-top: 40px; }
.site-footer .wrap { padding-top: 20px; padding-bottom: 40px; }
.site-footer p { color: var(--muted); font-size: 13px; margin: 0; }