* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  font-size: 16px;
  line-height: 1.6;
  color: #24292f;
  background: #fff;
}

a { color: #0969da; text-decoration: none; }
a:hover { text-decoration: underline; }

.page { display: flex; min-height: 100vh; }

/* ---------- Sidebar ---------- */
.sidebar {
  width: 264px;
  flex-shrink: 0;
  background: #f6f8fa;
  border-right: 1px solid #d8dee4;
  padding: 24px 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.brand { padding: 0 20px 20px; border-bottom: 1px solid #d8dee4; margin-bottom: 12px; }
.brand-name { font-size: 20px; font-weight: 700; color: #24292f; display: block; }
.brand-name:hover { text-decoration: none; color: #0969da; }
.tagline { font-size: 13px; color: #57606a; }

.nav-heading {
  margin: 16px 20px 4px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #57606a;
}

.nav-list { list-style: none; margin: 0; padding: 0; }
.nav-list li { margin: 0; }
.nav-list a {
  display: block;
  padding: 5px 20px;
  font-size: 14px;
  color: #24292f;
  border-left: 3px solid transparent;
}
.nav-list a:hover { text-decoration: none; color: #0969da; background: #eaeef2; }
.nav-list a.active {
  color: #0969da;
  font-weight: 600;
  background: #ddf4ff;
  border-left-color: #0969da;
}

/* ---------- Content ---------- */
.content {
  flex: 1;
  min-width: 0;
  padding: 32px 48px 24px;
  max-width: 960px;
}

.site-footer {
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid #d8dee4;
  font-size: 13px;
  color: #57606a;
}

/* ---------- Markdown body ---------- */
.markdown-body > *:first-child { margin-top: 0; }

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  margin-top: 28px;
  margin-bottom: 12px;
  font-weight: 600;
  line-height: 1.25;
  color: #1f2328;
}

.markdown-body h1 {
  font-size: 2em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid #d8dee4;
}
.markdown-body h2 {
  font-size: 1.5em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid #d8dee4;
}
.markdown-body h3 { font-size: 1.25em; }
.markdown-body h4 { font-size: 1em; }
.markdown-body h5 { font-size: 0.875em; }
.markdown-body h6 { font-size: 0.85em; color: #57606a; }

.markdown-body p { margin: 0 0 16px; }

.markdown-body code,
.markdown-body kbd {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
  background: #f6f8fa;
  border-radius: 6px;
  padding: 0.2em 0.4em;
}

.markdown-body pre {
  background: #f6f8fa;
  border: 1px solid #d8dee4;
  border-radius: 6px;
  padding: 16px;
  overflow-x: auto;
  line-height: 1.45;
  margin: 0 0 16px;
}
.markdown-body pre code { background: none; padding: 0; font-size: 13px; }

.markdown-body blockquote {
  margin: 0 0 16px;
  padding: 0 1em;
  color: #57606a;
  border-left: 0.25em solid #d8dee4;
}
.markdown-body blockquote > *:first-child { margin-top: 0; }
.markdown-body blockquote > *:last-child { margin-bottom: 0; }

.markdown-body ul,
.markdown-body ol { padding-left: 2em; margin: 0 0 16px; }
.markdown-body li { margin: 0.25em 0; }
.markdown-body li > ul,
.markdown-body li > ol { margin-bottom: 0; }

.markdown-body table {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  border-spacing: 0;
  border-collapse: collapse;
  margin: 0 0 16px;
}
.markdown-body table th,
.markdown-body table td {
  padding: 6px 13px;
  border: 1px solid #d8dee4;
}
.markdown-body table th {
  font-weight: 600;
  background: #f6f8fa;
}
.markdown-body table tr:nth-child(2n) { background: #f6f8fa; }

.markdown-body hr {
  height: 1px;
  padding: 0;
  margin: 24px 0;
  background: #d8dee4;
  border: 0;
}

.markdown-body img { max-width: 100%; }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .page { flex-direction: column; }
  .sidebar {
    width: 100%;
    height: auto;
    position: static;
    border-right: none;
    border-bottom: 1px solid #d8dee4;
    padding: 16px 0;
  }
  .nav-heading { margin-top: 10px; }
  .content { padding: 20px 16px; }
}