/* =========================================================================
   XeeNet Documentation
   ========================================================================= */

:root {
  --colour-bg: #0d1117;
  --colour-surface: #161b22;
  --colour-surface-raised: #1c2129;
  --colour-border: #30363d;
  --colour-border-light: #21262d;
  --colour-text: #e6edf3;
  --colour-text-muted: #8b949e;
  --colour-text-subtle: #6e7681;
  --colour-primary: #58a6ff;
  --colour-primary-dim: #1f6feb;
  --colour-accent: #3fb950;
  --colour-accent-amber: #d29922;
  --colour-accent-red: #f85149;
  --colour-accent-purple: #bc8cff;
  --colour-accent-pink: #f778ba;
  --colour-code-bg: #0d1117;
  --sidebar-width: 260px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --max-width: 880px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--colour-bg);
  color: var(--colour-text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* =========================================================================
   Sidebar
   ========================================================================= */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--colour-surface);
  border-right: 1px solid var(--colour-border);
  overflow-y: auto;
  z-index: 200;
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 1.25rem 1.25rem 0.75rem;
  border-bottom: 1px solid var(--colour-border);
}

.sidebar-brand {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--colour-text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sidebar-logo {
  color: var(--colour-primary);
  font-size: 1.3rem;
}

.sidebar-nav {
  flex: 1;
  padding: 0.75rem 0;
  display: flex;
  flex-direction: column;
}

.sidebar-section {
  padding: 0.25rem 0;
}

.sidebar-section-title {
  display: block;
  padding: 0.5rem 1.25rem 0.25rem;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--colour-text-subtle);
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 1.25rem;
  color: var(--colour-text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: all 0.15s;
}

.sidebar-link:hover {
  color: var(--colour-text);
  background: var(--colour-surface-raised);
}

.sidebar-link.active {
  color: var(--colour-primary);
  border-left-color: var(--colour-primary);
  background: rgba(88, 166, 255, 0.08);
}

.sidebar-icon { font-size: 1rem; width: 1.2rem; text-align: center; }

.sidebar-footer-section { margin-top: auto; border-top: 1px solid var(--colour-border); padding-top: 0.5rem; }

.sidebar-external { font-size: 0.82rem; color: var(--colour-text-subtle); }

/* Mobile */
.sidebar-toggle-input { display: none; }
.sidebar-overlay { display: none; }
.mobile-header { display: none; }

/* =========================================================================
   Main content area
   ========================================================================= */

.main-wrapper {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 2rem;
}

/* =========================================================================
   Hero
   ========================================================================= */

.hero {
  text-align: center;
  padding: 3rem 0 2.5rem;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--colour-primary) 0%, #3fb950 50%, var(--colour-accent-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 1.2rem;
  color: var(--colour-text-muted);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

/* =========================================================================
   Typography
   ========================================================================= */

.section {
  padding: 2rem 0;
}

.section h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.section h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}

.section p {
  color: var(--colour-text-muted);
  margin-bottom: 1rem;
  max-width: 75ch;
}

.section ul, .section ol {
  color: var(--colour-text-muted);
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.section li { margin-bottom: 0.4rem; }

.section a { color: var(--colour-primary); text-decoration: none; }
.section a:hover { text-decoration: underline; }

/* =========================================================================
   Page header (sub-pages)
   ========================================================================= */

.page-header {
  padding: 2rem 0 1.5rem;
  border-bottom: 1px solid var(--colour-border);
  margin-bottom: 2rem;
}

.page-header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

.page-header .lead {
  font-size: 1.05rem;
  color: var(--colour-text-muted);
  max-width: 600px;
}

/* =========================================================================
   Cards
   ========================================================================= */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--colour-surface);
  border: 1px solid var(--colour-border);
  border-radius: 10px;
  padding: 1.5rem;
  transition: border-color 0.2s, transform 0.2s;
}

.card:hover {
  border-color: var(--colour-primary-dim);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 1.5rem;
  margin-bottom: 0.6rem;
  display: block;
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.4rem;
  color: var(--colour-text);
}

.card p {
  font-size: 0.88rem;
  color: var(--colour-text-muted);
  margin: 0;
  line-height: 1.6;
}

/* =========================================================================
   Code
   ========================================================================= */

pre {
  background: var(--colour-code-bg);
  border: 1px solid var(--colour-border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.65;
  margin: 1rem 0 1.25rem;
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--colour-surface);
  padding: 0.15em 0.35em;
  border-radius: 4px;
}

pre code { background: none; padding: 0; font-size: 1em; }

/* =========================================================================
   Tables
   ========================================================================= */

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.88rem;
}

th, td {
  text-align: left;
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--colour-border);
}

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

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

/* =========================================================================
   Badges
   ========================================================================= */

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15em 0.55em;
  border-radius: 6px;
  font-family: var(--font-mono);
}

.badge-green { background: rgba(63, 185, 80, 0.15); color: var(--colour-accent); }
.badge-blue { background: rgba(88, 166, 255, 0.15); color: var(--colour-primary); }
.badge-amber { background: rgba(210, 153, 34, 0.15); color: var(--colour-accent-amber); }

/* =========================================================================
   Callouts
   ========================================================================= */

.callout {
  border-left: 3px solid var(--colour-primary);
  background: var(--colour-surface);
  padding: 1rem 1.25rem;
  border-radius: 0 8px 8px 0;
  margin: 1.25rem 0;
}

.callout p { margin: 0; font-size: 0.92rem; }

.callout-title {
  font-weight: 600;
  color: var(--colour-primary);
  margin-bottom: 0.35rem;
  font-size: 0.85rem;
}

/* =========================================================================
   Screenshots
   ========================================================================= */

.screenshot {
  margin: 1.5rem 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--colour-border);
  background: var(--colour-surface);
}

.screenshot img {
  width: 100%;
  display: block;
}

.screenshot-caption {
  padding: 0.6rem 1rem;
  font-size: 0.82rem;
  color: var(--colour-text-subtle);
  border-top: 1px solid var(--colour-border);
  text-align: center;
}

/* =========================================================================
   Mermaid diagrams
   ========================================================================= */

.mermaid {
  margin: 1.5rem 0;
  text-align: center;
}

.mermaid svg {
  max-width: 100%;
}

/* Bold black text inside diagram nodes — target every descendant including <p> */
.mermaid .nodeLabel,
.mermaid .nodeLabel p,
.mermaid .nodeLabel span,
.mermaid .nodeLabel div,
.mermaid .nodeLabel * { color: #000 !important; font-weight: 700 !important; }
.mermaid .node .label,
.mermaid .node .label p,
.mermaid .node .label * { color: #000 !important; font-weight: 700 !important; }
.mermaid .node text { fill: #000 !important; font-weight: 700 !important; }
.mermaid .node foreignObject,
.mermaid .node foreignObject div,
.mermaid .node foreignObject p,
.mermaid .node foreignObject span,
.mermaid .node foreignObject * { color: #000 !important; font-weight: 700 !important; }
.mermaid [class*="node"] span,
.mermaid [class*="node"] p { color: #000 !important; font-weight: 700 !important; }
/* Edge labels remain light for dark background */
.mermaid .edgeLabel,
.mermaid .edgeLabel p,
.mermaid .edgeLabel span,
.mermaid .edgeLabel * { color: #e6edf3 !important; }
.mermaid .edgeLabel .label,
.mermaid .edgeLabel .label p { color: #e6edf3 !important; background: #0d1117 !important; }
.mermaid .edgePath .path { stroke: #79c0ff !important; stroke-width: 2px !important; }
.mermaid .arrowheadPath { fill: #79c0ff !important; stroke: #79c0ff !important; }
.mermaid marker path { fill: #79c0ff !important; }

/* =========================================================================
   Pipeline flow
   ========================================================================= */

.pipeline-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin: 1.5rem 0;
}

.pipeline-step {
  background: var(--colour-surface);
  border: 1px solid var(--colour-border);
  border-radius: 8px;
  padding: 0.55rem 1rem;
  text-align: center;
  font-size: 0.82rem;
  font-weight: 500;
}

.pipeline-arrow {
  color: var(--colour-primary);
  font-size: 1.1rem;
}

/* =========================================================================
   Divider
   ========================================================================= */

.divider {
  height: 1px;
  background: var(--colour-border);
  margin: 1rem 0;
}

/* =========================================================================
   Metric highlight
   ========================================================================= */

.metric-highlight {
  color: var(--colour-accent);
  font-weight: 600;
  font-family: var(--font-mono);
}

/* =========================================================================
   Footer
   ========================================================================= */

.footer {
  border-top: 1px solid var(--colour-border);
  padding: 1.5rem 2rem;
  text-align: center;
}

.footer p {
  color: var(--colour-text-subtle);
  font-size: 0.8rem;
  margin: 0;
}

/* =========================================================================
   Responsive
   ========================================================================= */

@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
  }

  .sidebar-toggle-input:checked ~ .sidebar {
    transform: translateX(0);
  }

  .sidebar-toggle-input:checked ~ .sidebar-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 150;
    cursor: pointer;
  }

  .mobile-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    background: var(--colour-surface);
    border-bottom: 1px solid var(--colour-border);
    position: sticky;
    top: 0;
    z-index: 100;
  }

  .mobile-menu-btn {
    font-size: 1.4rem;
    color: var(--colour-text-muted);
    cursor: pointer;
    background: none;
    border: none;
  }

  .mobile-brand {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--colour-text);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.4rem;
  }

  .main-wrapper {
    margin-left: 0;
  }

  .main-content {
    padding: 1.5rem 1.25rem;
  }

  .hero h1 { font-size: 2.2rem; }
  .hero .subtitle { font-size: 1rem; }
  .card-grid { grid-template-columns: 1fr; }
}