:root {
  --primary: #6C63FF;
  --primary-dark: #5A52D5;
  --primary-light: rgba(108,99,255,0.15);
  --bg: #0D1117;
  --surface: #161B22;
  --surface-hover: #1C2128;
  --border: #30363D;
  --text: #E6EDF3;
  --text-muted: #8B949E;
  --text-dim: #6E7681;
  --accent: #58A6FF;
  --green: #3FB950;
  --orange: #D29922;
  --red: #F85149;
  --pink: #DB61A2;
  --code-bg: #0D1117;
  --code-border: #30363D;
  --sidebar-width: 260px;
}

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

html { scroll-behavior: smooth; }

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;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.docs-layout {
  display: flex;
  min-height: 100vh;
}

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

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 20px 20px;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 18px;
}
.sidebar-brand:hover { text-decoration: none; color: var(--primary); }

.sidebar-section {
  padding: 16px 0 4px;
}

.sidebar-section-title {
  padding: 0 20px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.sidebar-link {
  display: block;
  padding: 6px 20px 6px 24px;
  color: var(--text-muted);
  font-size: 14px;
  border-left: 2px solid transparent;
  transition: all 0.15s;
}
.sidebar-link:hover {
  color: var(--text);
  background: var(--surface-hover);
  text-decoration: none;
}
.sidebar-link.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: rgba(88,166,255,0.05);
}

/* Main content */
.content {
  flex: 1;
  margin-left: var(--sidebar-width);
  max-width: 860px;
  padding: 48px 48px 80px;
}

.content h1 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.content .subtitle {
  font-size: 18px;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.content h2 {
  font-size: 24px;
  font-weight: 600;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.content h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--text);
}

.content h4 {
  font-size: 16px;
  font-weight: 600;
  margin: 20px 0 8px;
  color: var(--text-muted);
}

.content p {
  margin-bottom: 16px;
  color: var(--text);
}

.content ul, .content ol {
  margin: 0 0 16px 24px;
}

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

/* Code blocks */
.code-block {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  padding: 20px;
  margin: 16px 0 24px;
  overflow-x: auto;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
}

.code-block .comment { color: var(--text-dim); }
.code-block .keyword { color: var(--pink); }
.code-block .string { color: var(--green); }
.code-block .type { color: var(--orange); }
.code-block .fn { color: var(--accent); }

code {
  background: var(--surface);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.9em;
  color: var(--accent);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
}

th, td {
  text-align: left;
  padding: 10px 14px;
  border: 1px solid var(--border);
  font-size: 14px;
}

th {
  background: var(--surface);
  font-weight: 600;
  color: var(--text);
}

td { color: var(--text-muted); }

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  margin: 12px 0;
  transition: border-color 0.2s;
}
.card:hover { border-color: var(--primary); }

.card h4 { margin-top: 0; color: var(--text); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin: 16px 0 24px;
}

/* Callouts */
.callout {
  border-radius: 8px;
  padding: 16px 20px;
  margin: 16px 0 24px;
  border-left: 4px solid;
  font-size: 14px;
}
.callout-info {
  background: rgba(88,166,255,0.08);
  border-color: var(--accent);
}
.callout-warning {
  background: rgba(210,153,34,0.08);
  border-color: var(--orange);
}
.callout-danger {
  background: rgba(248,81,73,0.08);
  border-color: var(--red);
}
.callout-success {
  background: rgba(63,185,80,0.08);
  border-color: var(--green);
}

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

/* Breadcrumb */
.breadcrumb {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 16px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin: 0 6px; }

/* Footer */
.docs-footer {
  margin-top: 60px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-dim);
}

/* Diagram boxes */
.arch-diagram {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  margin: 16px 0 24px;
}

.arch-diagram pre {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Badge row */
.badge-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 8px 0 24px;
}
.badge-row img { height: 20px; }

/* Responsive */
@media (max-width: 900px) {
  .sidebar { display: none; }
  .content { margin-left: 0; padding: 24px; }
}