:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666666;
  --accent: #2d6cdf;
  --card: #f7f7f8;
  --border: #eaeaea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111111;
    --fg: #e8e8e8;
    --muted: #9a9a9a;
    --accent: #6ea8fe;
    --card: #1a1a1a;
    --border: #2a2a2a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.75;
}
.container { max-width: 720px; margin: 0 auto; padding: 0 20px; }
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}
.nav { display: flex; justify-content: space-between; align-items: center; }
.brand { font-weight: 700; font-size: 18px; color: var(--fg); text-decoration: none; }
nav a { margin-left: 18px; color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--accent); }
.hero { padding: 48px 0 24px; }
.hero h1 { font-size: 34px; margin: 0 0 8px; }
.slogan { color: var(--muted); font-size: 17px; margin: 0; }
.post-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  margin: 16px 0;
  transition: border-color .2s;
}
.post-card:hover { border-color: var(--accent); }
.post-card h2 { margin: 0 0 6px; font-size: 20px; }
.post-card a { color: var(--fg); text-decoration: none; }
.meta { color: var(--muted); font-size: 13px; margin-bottom: 8px; }
.content { padding: 8px 0; }
.page-title { font-size: 26px; margin: 24px 0; }
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 48px;
  padding: 24px 0;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}
article.post h1 { font-size: 28px; margin: 24px 0 8px; }
.post a { color: var(--accent); }
code { background: var(--card); padding: 2px 6px; border-radius: 4px; font-size: 14px; }
pre { background: var(--card); padding: 14px; border-radius: 8px; overflow: auto; }
pre code { background: none; padding: 0; }
img { max-width: 100%; border-radius: 8px; }
.pagination { margin: 24px 0; }
.pagination a { color: var(--accent); text-decoration: none; margin-right: 16px; }