:root {
  --bg: #101418;
  --bg-side: #0b0e11;
  --bg-code: #171d24;
  --fg: #cfd8e3;
  --fg-dim: #7b8794;
  --accent: #d4a017;
  --link: #6fb3e0;
  --border: #232b34;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  display: flex;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
}
.sidebar {
  width: 250px;
  flex-shrink: 0;
  background: var(--bg-side);
  border-right: 1px solid var(--border);
  padding: 1.2rem 1rem 2rem;
  overflow-y: auto;
  position: sticky;
  top: 0;
  height: 100vh;
}
.site-title {
  display: block;
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
  margin-bottom: 1rem;
  font-size: 1.05rem;
}
.nav-heading {
  color: var(--fg-dim);
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  margin: 1.1rem 0 0.3rem;
}
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li a {
  display: block;
  color: var(--fg);
  text-decoration: none;
  font-size: 0.88rem;
  padding: 0.18rem 0.5rem;
  border-radius: 4px;
}
.sidebar li a:hover { background: var(--bg-code); }
.sidebar li a.active { background: var(--bg-code); color: var(--accent); }
main {
  flex: 1;
  min-width: 0;
  padding: 2rem 2.5rem 4rem;
  max-width: 60rem;
}
h1 { color: var(--accent); font-size: 1.6rem; margin-top: 0; }
h2 {
  font-size: 1.15rem;
  margin: 1.8rem 0 0.6rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.25rem;
}
a { color: var(--link); }
img { max-width: 100%; border: 1px solid var(--border); border-radius: 6px; }
pre {
  position: relative;
  background: var(--bg-code) !important;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.45;
}
code { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
.copy-btn {
  position: absolute;
  top: 0.45rem;
  right: 0.45rem;
  background: var(--bg);
  color: var(--fg-dim);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.72rem;
  padding: 0.15rem 0.5rem;
  cursor: pointer;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.meta {
  color: var(--fg-dim);
  font-size: 0.78rem;
  border-top: 1px solid var(--border);
  padding-top: 0.6rem;
  margin-top: 2.5rem;
}
.page-list li { margin: 0.3rem 0; }
@media (max-width: 720px) {
  body { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; }
  main { padding: 1.2rem; }
}