:root {
  --bg-main: #0d1117;
  --bg-sidebar: #161b22;
  --bg-card: #161b22;
  --border-color: #30363d;
  --text-main: #c9d1d9;
  --text-muted: #8b949e;
  --text-heading: #f0f6fc;
  --accent: #58a6ff;
  --accent-rgb: 88, 166, 255;
  --code-bg: #0b0e14;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
}

.layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 280px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
  transition: transform 0.25s ease;
}

.sidebar-brand {
  padding: 24px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-heading);
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-brand .icon {
  color: var(--accent);
}

.sidebar-nav {
  padding: 16px 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.nav-link {
  padding: 10px 24px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.nav-link:hover {
  color: var(--text-heading);
  background-color: rgba(255, 255, 255, 0.03);
}

.nav-link.active {
  color: var(--accent);
  background-color: rgba(88, 166, 255, 0.08);
  border-right: 3px solid var(--accent);
}

/* Main Area */
.main-content {
  margin-left: 280px;
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 40px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-main);
  position: sticky;
  top: 0;
  z-index: 50;
}

.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-heading);
  font-size: 1.4rem;
  cursor: pointer;
}

.badge {
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 20px;
  background: rgba(88, 166, 255, 0.1);
  color: var(--accent);
  font-family: var(--font-mono);
}

.content-wrapper {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px;
  width: 100%;
}

.section {
  margin-bottom: 56px;
  scroll-margin-top: 80px;
}

h1, h2, h3 {
  color: var(--text-heading);
  font-weight: 600;
  margin-bottom: 16px;
}

h1 { font-size: 2.2rem; }
h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border-color); padding-bottom: 8px; margin-top: 24px; }
h3 { font-size: 1.15rem; margin-top: 20px; }

p { margin-bottom: 16px; }
p.lead { font-size: 1.1rem; color: var(--text-muted); }

/* Grid Cards */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
}

.card h3 {
  margin-top: 0;
  font-size: 1.05rem;
  color: var(--accent);
}

.card p {
  margin-bottom: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Callouts */
.callout {
  padding: 16px;
  border-radius: 6px;
  margin: 20px 0;
  font-size: 0.95rem;
}

.callout.warning {
  background-color: rgba(210, 153, 34, 0.1);
  border-left: 4px solid #d29922;
  color: #e3b341;
}

/* Tables */
.table-container {
  overflow-x: auto;
  margin: 20px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th, td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  background-color: var(--bg-card);
  color: var(--text-heading);
  font-weight: 600;
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background-color: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  color: #79c0ff;
}

pre {
  background-color: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  margin: 16px 0;
}

pre code {
  background-color: transparent;
  padding: 0;
  color: var(--text-main);
  font-size: 0.85rem;
}

ul {
  margin-left: 20px;
  margin-bottom: 16px;
}

li {
  margin-bottom: 6px;
}

/* Diagram Styling */
.diagram-container {
  margin: 28px 0;
  padding: 16px;
  background-color: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  text-align: center;
}

.architecture-diagram {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

.diagram-caption {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

/* Mobile Responsive */
@media (max-width: 850px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }

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

  .menu-toggle {
    display: block;
  }

  .content-wrapper {
    padding: 24px 16px;
  }

  .sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 90;
    display: none;
  }

  .sidebar-overlay.active {
    display: block;
  }
}