@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg-0: #07090f;
  --bg-1: #0a0e1a;
  --bg-2: #000814;
  --bg-card: #0f1729;
  --border: #134870;
  --border-soft: #1f2937;
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-body: #a8d5ff;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  --accent-cyan: #22d3ee;
  --accent-purple: #8b5cf6;
  --accent-green: #4dffaa;
  --accent-blue: #4db8ff;
  --accent-amber: #f59e0b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-0);
  color: var(--text-body);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.doc-bar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(7, 9, 15, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.doc-bar a.back {
  color: var(--accent-blue);
  text-decoration: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 1px;
  transition: color 0.15s;
}
.doc-bar a.back:hover { color: var(--accent-green); }
.doc-bar .nav-right a {
  color: var(--text-muted);
  text-decoration: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 1px;
  margin-left: 20px;
  transition: color 0.15s;
}
.doc-bar .nav-right a:hover { color: var(--accent-green); }
.doc-bar .nav-right a.current { color: var(--accent-blue); }

.doc-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 60px 32px 120px;
}

/* Markdown-rendered content */
.md h1 {
  font-size: 48px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 60px 0 16px;
  color: var(--text-primary);
  background: linear-gradient(135deg, #22d3ee 0%, #8b5cf6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.md h1:first-child { margin-top: 0; }
.md h2 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 56px 0 16px;
  color: var(--text-primary);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.md h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 36px 0 12px;
  color: var(--text-primary);
}
.md h4 {
  font-size: 16px;
  font-weight: 600;
  margin: 28px 0 8px;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.md p {
  margin: 0 0 20px;
  color: var(--text-body);
}
.md p.subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.md strong { color: var(--text-primary); font-weight: 600; }
.md em { color: var(--text-secondary); font-style: italic; }

.md a {
  color: var(--accent-blue);
  text-decoration: none;
  border-bottom: 1px dashed var(--accent-blue);
  transition: all 0.15s;
}
.md a:hover {
  color: var(--accent-green);
  border-bottom-color: var(--accent-green);
}

/* Callout blocks */
.md blockquote {
  margin: 28px 0;
  padding: 20px 28px;
  background: var(--bg-card);
  border-left: 3px solid var(--accent-purple);
  border-radius: 4px;
  color: var(--text-primary);
  font-style: italic;
  font-size: 17px;
  line-height: 1.6;
}
.md blockquote p { margin: 0 0 12px; color: var(--text-primary); }
.md blockquote p:last-child { margin: 0; }

/* Code / ASCII diagrams */
.md pre {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 20px 24px;
  overflow-x: auto;
  margin: 28px 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  line-height: 1.5;
  color: var(--accent-blue);
  white-space: pre;
}
.md pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  color: inherit;
}
.md code {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: 3px;
  padding: 2px 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--accent-cyan);
}

/* Tables */
.md table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
}
.md th, .md td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.md th {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--bg-card);
}
.md td { color: var(--text-body); }
.md td code {
  font-size: 11px;
  padding: 2px 4px;
}

/* Lists */
.md ul, .md ol { padding-left: 28px; margin: 0 0 20px; }
.md li { margin: 8px 0; color: var(--text-body); }
.md li::marker { color: var(--accent-cyan); }

/* Horizontal rules */
.md hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 48px 0;
}

/* Footer */
.doc-foot {
  max-width: 760px;
  margin: 64px auto 0;
  padding: 32px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
}
.doc-foot a { color: var(--text-muted); text-decoration: none; margin: 0 12px; }
.doc-foot a:hover { color: var(--accent-green); }

/* Loading state */
.loading {
  text-align: center;
  padding: 120px 0;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 1px;
}
.loading::after {
  content: '_';
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* Mobile */
@media (max-width: 640px) {
  .doc-wrap { padding: 32px 20px 80px; }
  .md h1 { font-size: 36px; }
  .md h2 { font-size: 22px; }
  .md h3 { font-size: 17px; }
  .md pre { font-size: 10px; padding: 14px 16px; }
  .md table { font-size: 12px; }
  .md th, .md td { padding: 8px 10px; }
  .doc-bar { padding: 10px 16px; }
  .doc-bar .nav-right a { margin-left: 12px; font-size: 10px; }
}

/* Selection colour */
::selection { background: rgba(34, 211, 238, 0.25); color: var(--text-primary); }