:root {
  --bg: #0d1117;
  --bg-alt: #161b22;
  --bg-hover: #1c2333;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --text-dim: #6e7681;
  --border: #30363d;
  --accent: #58a6ff;
  --accent-soft: #1f6feb;
  --code-bg: #151b23;
  --inline-code-bg: #252c3a;
  --green: #3fb950;
  --orange: #d29922;
  --red: #f85149;
  --purple: #bc8cff;
  --cyan: #39d2c0;
  --sidebar-width: 260px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
#sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--bg-alt);
  border-right: 1px solid var(--border);
  padding: 24px 0;
  overflow-y: auto;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
}

.sidebar-header {
  padding: 0 20px 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}

.sidebar-header h1 { font-size: 20px; font-weight: 700; }
.sidebar-header h1 a { color: var(--text); text-decoration: none; }
.sidebar-header h1 a:hover { color: var(--accent); }
.sidebar-version { font-size: 12px; color: var(--text-dim); margin-top: 2px; }

.nav-list { list-style: none; }
.nav-section { padding: 8px 0; }
.nav-section-title {
  display: block;
  padding: 4px 20px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}
.nav-section ul { list-style: none; }
.nav-section ul li a {
  display: block;
  padding: 4px 20px 4px 28px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  border-left: 2px solid transparent;
}
.nav-section ul li a:hover {
  color: var(--text);
  background: var(--bg-hover);
}
.nav-section ul li a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: rgba(88,166,255,0.06);
}

/* Main content */
#content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 48px 56px;
  max-width: 900px;
}

/* Markdown rendered content */
#markdown-render h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
#markdown-render h2 {
  font-size: 24px;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
#markdown-render h3 {
  font-size: 20px;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 8px;
}
#markdown-render h4 {
  font-size: 16px;
  font-weight: 600;
  margin-top: 20px;
  margin-bottom: 8px;
}
#markdown-render h2, #markdown-render h3, #markdown-render h4 {
  scroll-margin-top: 24px;
}
#markdown-render p { margin-bottom: 16px; }
#markdown-render a { color: var(--accent); text-decoration: none; }
#markdown-render a:hover { text-decoration: underline; }
#markdown-render strong { font-weight: 600; }
#markdown-render hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}
#markdown-render ul, #markdown-render ol { margin-bottom: 16px; padding-left: 24px; }
#markdown-render li { margin-bottom: 4px; }
#markdown-render blockquote {
  border-left: 4px solid var(--accent-soft);
  padding: 8px 16px;
  margin: 16px 0;
  background: var(--bg-alt);
  color: var(--text-muted);
}
#markdown-render blockquote p:last-child { margin-bottom: 0; }

/* Code blocks */
#markdown-render pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px;
  margin-bottom: 16px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.5;
}
#markdown-render pre code {
  background: none;
  padding: 0;
  border: none;
  font-size: 13px;
}
#markdown-render code {
  background: var(--inline-code-bg);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 0.875em;
  font-family: "SF Mono", "Monaco", "Inconsolata", "Fira Code", monospace;
}
#markdown-render :not(pre) > code {
  color: var(--cyan);
}

/* Tables */
#markdown-render table {
  border-collapse: collapse;
  width: 100%;
  margin-bottom: 16px;
  font-size: 14px;
}
#markdown-render th, #markdown-render td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}
#markdown-render th {
  background: var(--bg-alt);
  font-weight: 600;
}
#markdown-render tr:nth-child(even) {
  background: rgba(255,255,255,0.02);
}
#markdown-render tr:hover {
  background: rgba(255,255,255,0.04);
}

/* Loading and errors */
.loading, .error {
  text-align: center;
  padding: 80px 0;
  color: var(--text-muted);
}
.error { color: var(--red); }

/* Heading anchor links on hover */
#markdown-render h2:hover .anchor,
#markdown-render h3:hover .anchor,
#markdown-render h4:hover .anchor { opacity: 1; }

/* Small screen */
@media (max-width: 768px) {
  #sidebar {
    position: relative;
    width: 100%;
    min-width: 0;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  body { flex-direction: column; }
  #content {
    margin-left: 0;
    padding: 24px 20px;
  }
}