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

:root {
  --bg: #000000;
  --surface: #1e1e1e;
  --surface2: #141414;
  --border: rgba(255, 255, 255, 0.12);
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.65);
  --accent: #ffffff;
  --success: #3dd68c;
  --radius: 16px;
  --mono: 'SF Mono', 'Fira Code', ui-monospace, monospace;
  --max: 720px;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  line-height: 1.65;
  font-size: 16px;
  min-height: 100vh;
}

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #000000;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.2px;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: #ffffff;
  text-decoration: none;
  font-size: 15px;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); }
.nav-links a.active { text-decoration: underline; text-underline-offset: 4px; }

.nav-badge {
  background: #ffffff;
  color: #000000;
  font-size: 12px;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: 20px;
  text-decoration: none;
}

.layout {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 20px 80px;
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

@media (max-width: 800px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .nav-links { display: none; }
}

.sidebar {
  position: sticky;
  top: 76px;
  font-size: 0.8125rem;
}

.sidebar-title {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 10px;
}

.sidebar ul { list-style: none; }

.sidebar li { margin-bottom: 6px; }

.sidebar a {
  color: var(--muted);
  text-decoration: none;
}

.sidebar a:hover,
.sidebar a.active {
  color: var(--text);
}

.sidebar a.active { font-weight: 600; }

.doc h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 12px;
}

.doc .lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 28px;
  max-width: var(--max);
}

.doc h2 {
  font-size: 1.25rem;
  margin: 36px 0 12px;
  padding-top: 8px;
}

.doc h3 {
  font-size: 1rem;
  margin: 24px 0 8px;
}

.doc p { margin-bottom: 14px; max-width: var(--max); }

.doc ul, .doc ol {
  margin: 0 0 16px 1.25em;
  max-width: var(--max);
}

.doc li { margin-bottom: 6px; }

.doc a { color: var(--accent); }

.doc code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: var(--surface2);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.doc pre {
  margin: 16px 0;
  padding: 16px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.5;
  max-width: 100%;
}

.doc pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

.doc table {
  width: 100%;
  max-width: var(--max);
  border-collapse: collapse;
  margin: 16px 0 20px;
  font-size: 0.875rem;
}

.doc th, .doc td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.doc th {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.callout {
  max-width: var(--max);
  padding: 14px 16px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  margin: 20px 0;
  font-size: 0.9375rem;
}

.callout strong { display: block; margin-bottom: 4px; }

.path-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 24px 0 32px;
  max-width: var(--max);
}

.path-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s;
}

.path-card:hover { border-color: rgba(255, 255, 255, 0.35); }

.path-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.path-card p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--muted);
}

.path-card .tag {
  display: inline-block;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--success);
  margin-bottom: 8px;
}

.cta-bar {
  max-width: var(--max);
  margin-top: 40px;
  padding: 24px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
}

.cta-bar h2 {
  margin: 0 0 8px;
  padding: 0;
  font-size: 1.125rem;
}

.cta-bar p { margin-bottom: 16px; color: var(--muted); }

.btn {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
}

.btn-primary,
.doc a.btn-primary {
  background: #fff;
  color: #000;
}

.btn-secondary {
  border: 1px solid var(--border);
  color: #fff;
  margin-left: 8px;
}

.doc-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--muted);
  max-width: var(--max);
}

.mermaid-wrap {
  max-width: var(--max);
  margin: 20px 0 28px;
  padding: 20px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow-x: auto;
}