:root {
  --brand: #1677ff;
  --text: #2c3e50;
  --muted: #8a94a6;
  --line: #eef0f4;
  --bg: #fafbfc;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  max-width: 780px; margin: 0 auto; padding: 0 20px;
  color: var(--text); line-height: 1.85; background: var(--bg);
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header { padding: 44px 0 20px; border-bottom: 2px solid var(--line); }
.site-header .title { font-size: 26px; font-weight: 700; color: var(--brand); margin: 0; }
.site-header .subtitle { color: var(--muted); margin: 6px 0 0; font-size: 15px; }
.site-nav { margin-top: 18px; display: flex; gap: 22px; flex-wrap: wrap; }
.site-nav a { font-size: 15px; color: var(--text); }
.site-nav a:hover { color: var(--brand); text-decoration: none; }

main { padding: 8px 0 40px; }
.intro { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 20px 24px; margin: 28px 0; }
.intro h2 { margin: 0 0 8px; font-size: 18px; }
.intro p { margin: 6px 0; color: #4a5568; }

.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li { padding: 20px 0; border-bottom: 1px solid var(--line); }
.post-list .post-title { font-size: 19px; font-weight: 600; }
.post-list .post-meta { color: var(--muted); font-size: 13px; margin: 6px 0; }
.post-list .post-excerpt { color: #4a5568; margin: 8px 0 0; }

article.post { padding: 16px 0 8px; }
article.post h1 { font-size: 26px; margin: 12px 0 6px; }
article.post .post-meta { color: var(--muted); font-size: 14px; margin-bottom: 24px; }
article.post h2 { font-size: 20px; margin: 28px 0 8px; }
article.post p { margin: 12px 0; }
article.post ul, article.post ol { padding-left: 22px; }
article.post li { margin: 6px 0; }
article.post code {
  background: #f1f3f5; padding: 2px 6px; border-radius: 4px;
  font-family: "SFMono-Regular", Consolas, Menlo, monospace; font-size: 90%;
}
article.post pre {
  background: #1e293b; color: #e2e8f0; padding: 16px 18px; border-radius: 8px;
  overflow-x: auto; font-size: 13.5px; line-height: 1.6;
}
article.post pre code { background: none; color: inherit; padding: 0; }
article.post blockquote {
  margin: 16px 0; padding: 8px 16px; border-left: 3px solid var(--brand);
  background: #f0f6ff; color: #4a5568;
}
.back-link { display: inline-block; margin: 8px 0 0; font-size: 14px; }

.site-footer {
  margin-top: 40px; padding: 26px 0 44px; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 13px; text-align: center;
}
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--brand); }
.site-footer p { margin: 4px 0; }