:root {
  --bg: #0a0a0a;
  --bg-card: #141416;
  --bg-code: #0e1114;
  --fg: #e6e6e6;
  --fg-muted: #8a8a93;
  --fg-dim: #5a5a63;
  --accent: #7ee787;
  --accent-dim: #3fb950;
  --border: #22232a;
  --red: #f85149;
  --orange: #ffa657;
  --purple: #d2a8ff;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
code, pre, .mono {
  font-family: "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 960px; margin: 0 auto; padding: 40px 24px 96px; }

/* top bar */
header.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}
header.top .logo { font-weight: 700; font-size: 18px; letter-spacing: -0.01em; }
header.top .logo .dot { color: var(--accent); }
header.top .logo a { color: var(--fg); }
header.top .logo a:hover { text-decoration: none; }
header.top nav a { color: var(--fg-muted); margin-left: 24px; font-size: 14px; }
header.top nav a:hover { color: var(--fg); text-decoration: none; }
header.top nav a.current { color: var(--accent); }

/* doc layout: sidebar + content */
.layout { display: grid; grid-template-columns: 220px 1fr; gap: 40px; }
@media (max-width: 820px) { .layout { grid-template-columns: 1fr; } aside.sidebar { border-bottom: 1px solid var(--border); padding-bottom: 16px; margin-bottom: 24px; } }

aside.sidebar {
  font-size: 14px;
  position: sticky;
  top: 20px;
  align-self: start;
}
aside.sidebar h4 {
  color: var(--fg-muted);
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.08em;
  margin: 20px 0 8px;
  font-weight: 600;
}
aside.sidebar h4:first-child { margin-top: 0; }
aside.sidebar ul { list-style: none; padding: 0; margin: 0; }
aside.sidebar li { padding: 3px 0; }
aside.sidebar li a { color: var(--fg-muted); }
aside.sidebar li a:hover { color: var(--fg); text-decoration: none; }
aside.sidebar li.active a { color: var(--accent); font-weight: 500; }

/* article content */
article { min-width: 0; }
article .breadcrumb { color: var(--fg-dim); font-size: 13px; margin-bottom: 8px; }
article .breadcrumb a { color: var(--fg-muted); }
article h1 { font-size: 32px; line-height: 1.2; letter-spacing: -0.02em; font-weight: 700; margin: 0 0 10px; }
article .tagline { color: var(--fg-muted); font-size: 16px; margin: 0 0 32px; }
article h2 {
  font-size: 22px;
  letter-spacing: -0.01em;
  margin: 48px 0 14px;
  font-weight: 600;
  border-top: 1px solid var(--border);
  padding-top: 32px;
}
article h2:first-of-type { border-top: none; padding-top: 0; margin-top: 32px; }
article h3 { font-size: 17px; margin: 28px 0 10px; font-weight: 600; }
article h4 { font-size: 14px; margin: 20px 0 8px; font-weight: 600; color: var(--fg-muted); text-transform: uppercase; letter-spacing: 0.04em; }
article p { margin: 0 0 16px; }
article p.muted { color: var(--fg-muted); }
article strong { color: var(--fg); }
article em { font-style: italic; }
article ul, article ol { padding-left: 24px; margin: 0 0 16px; }
article li { margin: 4px 0; }
article li > ul, article li > ol { margin: 4px 0 0; }

article code:not(pre code) {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 12px;
}

article pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 18px;
  margin: 12px 0 20px;
  overflow-x: auto;
  line-height: 1.55;
}
article pre code { background: none; border: none; padding: 0; font-size: 13px; }
pre .c { color: var(--fg-dim); }
pre .k { color: var(--accent); }
pre .s { color: var(--purple); }
pre .h { color: var(--orange); }
pre .n { color: #79c0ff; }
pre .t { color: #ffa657; }

article table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}
article th, article td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
article th {
  background: var(--bg-card);
  color: var(--fg-muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.04em;
}
article tr:last-child td { border-bottom: none; }
article td code { font-size: 12px; }

article .callout {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  background: var(--bg-card);
  padding: 14px 18px;
  border-radius: 6px;
  margin: 24px 0;
  font-size: 14px;
  color: var(--fg-muted);
}
article .callout.warn { border-left-color: var(--orange); }
article .callout.info { border-left-color: #79c0ff; }
article .callout strong { color: var(--fg); }

article .grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 16px 0; }
@media (max-width: 640px) { article .grid2 { grid-template-columns: 1fr; } }
article .card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px 22px;
  background: var(--bg-card);
}
article .card h3 { margin-top: 0; }
article .card p:last-child { margin-bottom: 0; }
article .card a { display: block; }
article .card a:hover { text-decoration: none; }

article hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }

footer {
  margin-top: 80px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  color: var(--fg-dim);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
footer .links a { color: var(--fg-muted); margin-right: 20px; }
footer .links a:hover { color: var(--fg); }

::selection { background: var(--accent); color: var(--bg); }