:root {
  --bg: #ffffff;
  --surface: #f7f7f5;
  --border: #e4e4e0;
  --text: #1a1a18;
  --muted: #6b6b64;
  --accent: #185fa5;
  --accent-soft: #e6f1fb;
  --code-bg: #f2f2ef;
  --radius: 10px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px; line-height: 1.7; color: var(--text); background: var(--bg);
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

header.top {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 24px; background: var(--bg); border-bottom: 1px solid var(--border);
}
.brand { font-size: 17px; font-weight: 500; color: var(--text); }
.brand .brand-sub { font-size: 12px; color: var(--muted); margin-left: 8px; }
.top-links a { margin-left: 18px; font-size: 13px; color: var(--muted); }
.top-links a:hover { color: var(--accent); }

.wrap { display: flex; max-width: 1080px; margin: 0 auto; min-height: calc(100vh - 120px); }
nav.side {
  width: 200px; flex: 0 0 200px; padding: 28px 16px;
  border-right: 1px solid var(--border);
}
nav.side a {
  display: block; padding: 7px 12px; border-radius: 8px;
  font-size: 13.5px; color: var(--text); margin-bottom: 2px;
}
nav.side a:hover { background: var(--surface); text-decoration: none; }
nav.side a.active { background: var(--accent-soft); color: var(--accent); font-weight: 500; }
nav.side .side-foot { margin-top: 24px; padding-top: 14px; border-top: 1px solid var(--border); }
nav.side .side-foot a { color: var(--muted); font-size: 12.5px; }

main.content { flex: 1; min-width: 0; padding: 28px 40px 60px; }
.markdown-body { max-width: 760px; }
.markdown-body h1 { font-size: 26px; font-weight: 500; margin: 0 0 18px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.markdown-body h2 { font-size: 20px; font-weight: 500; margin: 32px 0 12px; }
.markdown-body h3 { font-size: 16px; font-weight: 500; margin: 24px 0 10px; }
.markdown-body p { margin: 10px 0; }
.markdown-body ul, .markdown-body ol { margin: 10px 0; padding-left: 24px; }
.markdown-body li { margin: 4px 0; }
.markdown-body blockquote {
  margin: 14px 0; padding: 10px 16px; border-left: 3px solid var(--accent);
  background: var(--surface); border-radius: 0 8px 8px 0; color: var(--muted);
}
.markdown-body code {
  font-family: "SF Mono", Menlo, Consolas, monospace; font-size: 13px;
  background: var(--code-bg); padding: 2px 6px; border-radius: 5px;
}
.markdown-body pre {
  position: relative; background: #101418; color: #e8e8e6;
  padding: 16px 18px; border-radius: var(--radius); overflow-x: auto;
  margin: 14px 0; line-height: 1.55;
}
.markdown-body pre code { background: none; color: inherit; padding: 0; font-size: 13px; }
.markdown-body table {
  border-collapse: collapse; width: 100%; margin: 14px 0; font-size: 14px;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border); padding: 8px 12px; text-align: left; vertical-align: top;
}
.markdown-body th { background: var(--surface); font-weight: 500; }
.copy-btn {
  position: absolute; top: 8px; right: 8px; cursor: pointer;
  font-size: 12px; color: #9a9a94; background: transparent; border: 1px solid #3a3a36;
  border-radius: 6px; padding: 3px 9px;
}
.copy-btn:hover { color: #fff; border-color: #666; }
.copy-btn.copied { color: #7ee2a8; border-color: #2f7a4f; }

footer.foot {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; border-top: 1px solid var(--border);
  font-size: 12.5px; color: var(--muted);
}
footer.foot .foot-links a { color: var(--muted); margin-left: 6px; }
footer.foot .foot-links a:hover { color: var(--accent); }

@media (max-width: 760px) {
  .wrap { flex-direction: column; }
  nav.side { width: 100%; flex: none; border-right: none; border-bottom: 1px solid var(--border); padding: 12px 16px; }
  nav.side a { display: inline-block; margin-right: 8px; }
  nav.side .side-foot { display: none; }
  main.content { padding: 20px 18px 50px; }
}