:root {
  --bg-main: #0b0f19;
  --bg-sidebar: #111827;
  --bg-card: #1f2937;
  --bg-code: #1e293b;
  --border-color: #374151;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --accent-primary: #10b981; 
  --accent-secondary: #3b82f6; 
  --accent-danger: #ef4444; 
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 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;
  display: flex;
  min-height: 100vh;
}

.app-container {
  display: flex;
  width: 100%;
}

.sidebar {
  width: 280px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  padding: 2rem 1.5rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: -0.025em;
}

.brand span {
  color: var(--accent-primary);
}

.nav-group {
  margin-bottom: 1.5rem;
}

.nav-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.nav-links {
  list-style: none;
}

.nav-links li {
  margin-bottom: 0.25rem;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  display: block;
  padding: 0.4rem 0.75rem;
  border-radius: 0.375rem;
  transition: all 0.2s ease;
}

.nav-links a:hover, .nav-links a.active {
  color: #fff;
  background-color: var(--bg-card);
}

.nav-links a.active {
  border-left: 3px solid var(--accent-primary);
  border-radius: 0 0.375rem 0.375rem 0;
  padding-left: 0.55rem;
}

.main-content {
  flex: 1;
  padding: 3rem 4rem;
  max-width: 1012px;
  overflow-y: auto;
}

h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  color: #fff;
}

p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
}

h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  color: #fff;
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--accent-secondary);
}

ul, ol {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-muted);
}

li {
  margin-bottom: 0.5rem;
}

strong {
  color: #fff;
}

code {
  font-family: var(--font-mono);
  background-color: var(--bg-code);
  color: #f1f5f9;
  padding: 0.2rem 0.4rem;
  border-radius: 0.25rem;
  font-size: 0.875rem;
}

pre {
  background-color: var(--bg-sidebar);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

pre code {
  background-color: transparent;
  padding: 0;
  border-radius: 0;
  color: #e2e8f0;
  line-height: 1.5;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.card {
  background-color: var(--bg-sidebar);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

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

.card h3 {
  margin-top: 0;
  color: #fff;
}

.card p {
  margin-bottom: 0;
  font-size: 0.925rem;
}

.api-list {
  list-style: none;
  margin-left: 0;
}

.api-item {
  background: var(--bg-sidebar);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  padding: 1rem;
  margin-bottom: 0.75rem;
}

.api-item code {
  color: var(--accent-primary);
  font-weight: 600;
}

@media (max-width: 768px) {
  body {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
    padding: 1.5rem;
  }
  .main-content {
    padding: 2rem 1.5rem;
  }
}