:root {
  --bg-base: #0b0f17;
  --bg-surface: #111827;
  --bg-card: #172033;
  --bg-card-hover: #1e293b;
  --border-subtle: #243049;
  --border-active: #3b82f6;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-primary: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-purple: #8b5cf6;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --sidebar-width: 280px;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

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

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 24px 16px;
  overflow-y: auto;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 8px 24px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 24px;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #2563eb, #06b6d4);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: #ffffff;
}

.brand-sub {
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: 500;
}

.nav-links {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.15s ease;
}

.nav-item:hover {
  background-color: var(--bg-card);
  color: var(--text-primary);
}

.nav-item.active {
  background-color: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.nav-icon {
  font-size: 16px;
}

.sidebar-footer {
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background-color: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: 9999px;
  font-size: 12px;
  color: #34d399;
  font-weight: 500;
  width: 100%;
  justify-content: center;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 8px #10b981;
}

/* Main Content */
.main-content {
  flex: 1;
  max-width: 980px;
  padding: 48px 48px 96px;
  overflow-x: hidden;
}

/* Header */
.doc-header {
  margin-bottom: 48px;
}

.badge-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.badge {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  letter-spacing: 0.2px;
}

.badge-primary {
  background-color: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.badge-secondary {
  background-color: rgba(100, 116, 139, 0.2);
  color: #cbd5e1;
  border: 1px solid rgba(100, 116, 139, 0.3);
}

.badge-accent {
  background-color: rgba(6, 182, 212, 0.15);
  color: #22d3ee;
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.badge-success {
  background-color: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.main-title {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.6px;
  line-height: 1.25;
  margin-bottom: 16px;
  color: #ffffff;
}

.lead-text {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 28px;
}

.inline-code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: rgba(255, 255, 255, 0.08);
  color: #93c5fd;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Quick Stats */
.quick-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 18px 20px;
  transition: transform 0.2s, border-color 0.2s;
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-active);
}

.stat-num {
  font-size: 24px;
  font-weight: 800;
  color: #60a5fa;
  margin-bottom: 4px;
  letter-spacing: -0.5px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
  font-weight: 500;
}

/* Content Sections */
.content-section {
  margin-bottom: 56px;
  scroll-margin-top: 32px;
}

.section-header {
  margin-bottom: 12px;
}

.section-tag {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  display: block;
  margin-bottom: 6px;
}

.section-header h2 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.4px;
  color: #ffffff;
}

.section-desc {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* Mermaid Chart Container */
.mermaid-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 24px;
  overflow-x: auto;
  margin-bottom: 24px;
}

.mermaid {
  display: flex;
  justify-content: center;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 20px;
  transition: all 0.2s ease;
}

.feature-card:hover {
  background: var(--bg-card);
  border-color: rgba(59, 130, 246, 0.4);
}

.feature-icon {
  font-size: 24px;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: #f1f5f9;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Code Blocks & Tabs */
.tab-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 24px;
}

.tab-header {
  display: flex;
  background: var(--bg-base);
  border-bottom: 1px solid var(--border-subtle);
  overflow-x: auto;
}

.tab-btn {
  background: none;
  border: none;
  padding: 12px 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  color: #60a5fa;
  border-bottom-color: #3b82f6;
  background-color: rgba(59, 130, 246, 0.08);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

.code-block-wrapper {
  background: #0d131f;
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  overflow: hidden;
}

.tab-container .code-block-wrapper {
  border: none;
  border-radius: 0;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  background: #111827;
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
}

.copy-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.copy-btn:hover {
  background: rgba(59, 130, 246, 0.2);
  border-color: #3b82f6;
  color: #93c5fd;
}

pre {
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  color: #e2e8f0;
}

/* Tree View */
.tree-view {
  background: #0d131f;
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
}

.tree-folder {
  color: #38bdf8;
  font-weight: 600;
}

.tree-file {
  color: #e2e8f0;
}

.tree-meta {
  color: var(--text-muted);
}

/* Steps List */
.steps-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-card {
  display: flex;
  gap: 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 20px;
}

.step-badge {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.3);
  font-size: 12px;
  font-weight: 700;
  height: 28px;
  padding: 0 10px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.step-body {
  flex: 1;
}

.step-body h4 {
  font-size: 16px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 6px;
}

.step-body p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.step-body pre {
  background: #0d131f;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 12px;
  font-size: 12px;
}

/* Footer */
.doc-footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 860px) {
  .sidebar {
    display: none;
  }
  .main-content {
    padding: 24px 16px 64px;
  }
  .main-title {
    font-size: 26px;
  }
}