:root {
  color-scheme: dark;
  --bg: #080f1d;
  --panel: #0d1729;
  --panel-2: #111e34;
  --border: #233552;
  --text: #dce8f8;
  --muted: #8fa4c2;
  --accent: #67a7ff;
  --accent-soft: rgba(59, 130, 246, 0.14);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.7 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.shell { min-height: 100vh; display: grid; grid-template-columns: 280px minmax(0, 1fr); }
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  padding: 28px 20px;
  border-right: 1px solid var(--border);
  background: var(--panel);
}
.brand { color: white; font-size: 21px; font-weight: 750; text-decoration: none; }
.tagline { margin: 3px 0 22px; color: var(--muted); font-size: 12px; }
.sidebar nav { display: grid; gap: 3px; }
.sidebar nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 7px 10px;
  border-left: 2px solid transparent;
  border-radius: 0 6px 6px 0;
  font-size: 13px;
}
.sidebar nav a:hover, .sidebar nav a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-soft);
}
.repo-link { display: inline-block; margin-top: 22px; color: var(--accent); font-size: 12px; }
.content { width: min(100%, 980px); padding: 42px 52px 80px; }
.preview {
  width: 100%;
  margin: 8px 0 28px;
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}
article h1 { margin: 0 0 20px; font-size: 30px; line-height: 1.25; }
article h2 { margin: 34px 0 10px; padding-bottom: 7px; border-bottom: 1px solid var(--border); color: var(--accent); font-size: 21px; }
article h3 { margin: 26px 0 8px; font-size: 17px; }
article p, article li { color: #c8d6ea; }
article a { color: var(--accent); }
article code, article kbd {
  padding: 2px 5px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--panel-2);
  color: #b9d7ff;
  font-size: 0.88em;
}
article pre { overflow: auto; padding: 16px; border: 1px solid var(--border); border-radius: 8px; background: #070d18; }
article pre code { padding: 0; border: 0; background: transparent; }
article blockquote { margin: 16px 0; padding: 4px 16px; border-left: 3px solid var(--accent); background: var(--accent-soft); }
article table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 13px; }
article th, article td { padding: 8px 10px; border: 1px solid var(--border); text-align: left; vertical-align: top; }
article th { background: var(--panel-2); }
article hr { border: 0; border-top: 1px solid var(--border); margin: 28px 0; }
.source { margin-top: 36px; color: var(--muted); font-size: 12px; }
@media (max-width: 800px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--border); }
  .sidebar nav { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
  .content { padding: 28px 20px 60px; }
  article table { display: block; overflow-x: auto; }
}