:root {
  --bg: #0b0d12;
  --bg2: #12151c;
  --bg3: #1a1f2b;
  --border: #2a3142;
  --text: #e8ecf4;
  --muted: #9aa3b5;
  --accent: #6ee7b7;
  --accent2: #60a5fa;
  --warn: #fbbf24;
  --danger: #f87171;
  --code: #0f1419;
  --link: #7dd3fc;
  --sidebar-w: 280px;
  --font: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", ui-monospace, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  font-size: 15.5px;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
code, kbd, pre { font-family: var(--mono); font-size: 0.9em; }
code {
  background: var(--bg3);
  border: 1px solid var(--border);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
pre {
  background: var(--code);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  line-height: 1.45;
}
pre code { background: none; border: none; padding: 0; }
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.95em;
}
th, td {
  border: 1px solid var(--border);
  padding: 0.55rem 0.7rem;
  text-align: left;
  vertical-align: top;
}
th { background: var(--bg3); color: var(--accent); font-weight: 600; }
tr:nth-child(even) td { background: rgba(255,255,255,0.02); }
h1, h2, h3, h4 { line-height: 1.25; font-weight: 650; }
h1 { font-size: 1.85rem; margin: 0 0 0.75rem; }
h2 {
  font-size: 1.35rem;
  margin: 2.4rem 0 0.85rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}
h3 { font-size: 1.1rem; margin: 1.6rem 0 0.55rem; color: var(--accent2); }
h4 { margin: 1.2rem 0 0.4rem; color: var(--muted); }
p, ul, ol { margin: 0.55rem 0 1rem; color: #d5dae6; }
ul, ol { padding-left: 1.3rem; }
li { margin: 0.28rem 0; }
.layout { display: flex; min-height: 100vh; }
.sidebar {
  position: sticky;
  top: 0;
  width: var(--sidebar-w);
  height: 100vh;
  overflow-y: auto;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  padding: 1.1rem 0.85rem 2rem;
  flex-shrink: 0;
}
.brand {
  display: block;
  padding: 0.4rem 0.55rem 1rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.85rem;
}
.brand strong { display: block; font-size: 1.05rem; color: var(--text); }
.brand span { font-size: 0.78rem; color: var(--muted); }
.nav-group { margin: 0.85rem 0 0.25rem; }
.nav-group > .label {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0.35rem 0.55rem;
}
.sidebar a.nav {
  display: block;
  padding: 0.32rem 0.55rem;
  border-radius: 6px;
  color: #c5cddc;
  font-size: 0.88rem;
  text-decoration: none;
}
.sidebar a.nav:hover, .sidebar a.nav.active {
  background: var(--bg3);
  color: var(--accent);
  text-decoration: none;
}
.main {
  flex: 1;
  min-width: 0;
  padding: 1.75rem 2.2rem 4rem;
  max-width: 980px;
}
.hero {
  background: linear-gradient(145deg, #121a28, #0d121a 55%, #102018);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem 1.6rem 1.35rem;
  margin-bottom: 1.5rem;
}
.hero .eyebrow {
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0 0 0.45rem;
}
.hero p { color: var(--muted); margin-bottom: 0.4rem; }
.badge-row { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.85rem; }
.badge {
  font-size: 0.72rem;
  border: 1px solid var(--border);
  background: var(--bg3);
  color: var(--muted);
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
}
.badge.ok { color: var(--accent); border-color: #14532d; }
.badge.info { color: var(--accent2); border-color: #1e3a5f; }
.callout {
  border-left: 3px solid var(--accent2);
  background: rgba(96,165,250,0.07);
  padding: 0.75rem 1rem;
  border-radius: 0 8px 8px 0;
  margin: 1rem 0;
}
.callout.warn { border-color: var(--warn); background: rgba(251,191,36,0.08); }
.callout.danger { border-color: var(--danger); background: rgba(248,113,113,0.08); }
.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}
@media (max-width: 900px) {
  .layout { flex-direction: column; }
  .sidebar { position: relative; width: 100%; height: auto; max-height: 40vh; }
  .main { padding: 1.1rem; }
  .grid2 { grid-template-columns: 1fr; }
}
.toc-mini { font-size: 0.9rem; columns: 2; gap: 1.5rem; }
.toc-mini a { display: block; margin: 0.2rem 0; }
.footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}
.search {
  width: 100%;
  margin: 0 0 0.75rem;
  padding: 0.5rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
}
.diagram {
  background: var(--code);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  white-space: pre;
  overflow-x: auto;
  color: #b8c0d0;
  line-height: 1.4;
}