:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-tertiary: #0f3460;
  --bg-code: #0d1117;
  --text-primary: #e4e4e7;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --accent-purple: #a855f7;
  --accent-blue: #3b82f6;
  --accent-green: #22c55e;
  --accent-yellow: #eab308;
  --accent-red: #ef4444;
  --accent-cyan: #06b6d4;
  --border-color: #27272a;
  --link-color: #60a5fa;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Header */
header {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  padding: 3rem 2rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

header .subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
}

header .badge {
  display: inline-block;
  background: var(--accent-green);
  color: var(--bg-primary);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: 1rem;
}

header .badge + .badge {
  margin-left: 0.5rem;
}

/* Navigation */
nav {
  background: var(--bg-secondary);
  padding: 1rem 2rem;
  border-radius: 0.75rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
}

nav h3 {
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

nav a {
  color: var(--link-color);
  text-decoration: none;
  padding: 0.375rem 0.75rem;
  border-radius: 0.375rem;
  background: rgba(59, 130, 246, 0.1);
  font-size: 0.875rem;
  transition: all 0.2s;
}

nav a:hover {
  background: rgba(59, 130, 246, 0.2);
  color: #93c5fd;
}

/* Sections */
section {
  background: var(--bg-secondary);
  border-radius: 0.75rem;
  padding: 2rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
}

section h2 {
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

section h3 {
  font-size: 1.125rem;
  color: var(--accent-cyan);
  margin: 1.5rem 0 0.75rem 0;
}

section p {
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

/* Function blocks */
.function {
  background: var(--bg-primary);
  border-radius: 0.5rem;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
}

.function-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
}

.function-name {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 1.125rem;
  color: var(--accent-blue);
  font-weight: 600;
}

.function-spec {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.8125rem;
  color: var(--text-muted);
  background: var(--bg-code);
  padding: 0.375rem 0.75rem;
  border-radius: 0.375rem;
}

.function p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

/* Parameters */
.params {
  margin: 1rem 0;
}

.params h4 {
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.params ul {
  list-style: none;
}

.params li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.params li:last-child {
  border-bottom: none;
}

.param-name {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  color: var(--accent-yellow);
  font-weight: 500;
}

.param-type {
  color: var(--accent-purple);
  font-size: 0.875rem;
  margin-left: 0.5rem;
}

.param-desc {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* Code blocks */
pre {
  background: var(--bg-code);
  border-radius: 0.5rem;
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0;
  border: 1px solid var(--border-color);
}

code {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875rem;
}

pre code {
  color: var(--text-primary);
}

p code, td code, li code {
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
}

.code-comment { color: var(--text-muted); }
.code-keyword { color: var(--accent-purple); }
.code-string { color: var(--accent-green); }
.code-atom { color: var(--accent-cyan); }
.code-number { color: var(--accent-yellow); }
.code-function { color: var(--accent-blue); }

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

th, td {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

th {
  background: var(--bg-primary);
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
}

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

/* Feature cards */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.feature-card {
  background: var(--bg-primary);
  border-radius: 0.5rem;
  padding: 1.25rem;
  border: 1px solid var(--border-color);
}

.feature-card h4 {
  color: var(--accent-purple);
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Warning/Info boxes */
.callout {
  padding: 1rem 1.25rem;
  border-radius: 0.5rem;
  margin: 1rem 0;
  border-left: 4px solid;
}

.callout-warning {
  background: rgba(234, 179, 8, 0.1);
  border-color: var(--accent-yellow);
}

.callout-warning h4 {
  color: var(--accent-yellow);
}

.callout-info {
  background: rgba(59, 130, 246, 0.1);
  border-color: var(--accent-blue);
}

.callout-info h4 {
  color: var(--accent-blue);
}

.callout-success {
  background: rgba(34, 197, 94, 0.1);
  border-color: var(--accent-green);
}

.callout-success h4 {
  color: var(--accent-green);
}

.callout h4 {
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.callout p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Return values */
.returns {
  background: var(--bg-primary);
  border-radius: 0.375rem;
  padding: 0.75rem 1rem;
  margin: 0.75rem 0;
}

.returns-label {
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.25rem;
}

.returns code {
  color: var(--accent-green);
}

/* Flow diagram */
.flow-diagram {
  background: var(--bg-code);
  border-radius: 0.5rem;
  padding: 1.5rem;
  margin: 1rem 0;
  border: 1px solid var(--border-color);
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.flow-diagram .arrow {
  color: var(--accent-blue);
}

.flow-diagram .label {
  color: var(--accent-cyan);
}

.flow-diagram .component {
  color: var(--accent-purple);
}

.flow-diagram .note {
  color: var(--text-muted);
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--border-color);
  margin-top: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  header {
    padding: 2rem 1rem;
  }

  header h1 {
    font-size: 1.75rem;
  }

  section {
    padding: 1.5rem;
  }

  .function-header {
    flex-direction: column;
  }

  nav ul {
    flex-direction: column;
  }

  .features {
    grid-template-columns: 1fr;
  }
}