:root {
  /* Google for Developers color scheme */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-card: #ffffff;
  --bg-code: #202124;
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --text-inverse: #ffffff;
  --border-color: #dadce0;
  --accent-blue: #1a73e8;
  --accent-blue-hover: #174ea6;
  --accent-green: #1e8e3e;
  --header-height: 64px;
  --sidebar-width: 256px;
  --font-sans: 'Google Sans', 'Inter', Roboto, Arial, sans-serif;
  --font-mono: 'Roboto Mono', 'Fira Code', monospace;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* Header */
.dev-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 24px;
  z-index: 100;
}

.dev-header .logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  font-size: 20px;
  font-weight: 500;
  color: var(--text-primary);
}

.dev-header .logo span {
  color: var(--text-secondary);
  margin-left: 6px;
}

.dev-nav {
  margin-left: 48px;
  display: flex;
  gap: 24px;
}

.dev-nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 14px;
}

.dev-nav a:hover, .dev-nav a.active {
  color: var(--accent-blue);
}

/* Layout */
.page-container {
  display: flex;
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  position: fixed;
  top: var(--header-height);
  bottom: 0;
  overflow-y: auto;
  padding: 24px 0;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
}

.sidebar-section {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  font-weight: 700;
  padding: 8px 24px;
  margin-top: 16px;
}

.sidebar-link {
  text-decoration: none;
  color: var(--text-primary);
  font-size: 14px;
  padding: 8px 24px;
  display: block;
}

.sidebar-link:hover {
  background: rgba(26,115,232,0.04);
  color: var(--accent-blue);
}

.sidebar-link.active {
  color: var(--accent-blue);
  background: rgba(26,115,232,0.1);
  font-weight: 500;
  border-radius: 0 16px 16px 0;
  margin-right: 16px;
}

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 48px 64px;
  max-width: 1000px;
}

.main-content.no-sidebar {
  margin-left: 0;
  max-width: 1200px;
  margin: 0 auto;
}

/* Typography & Content */
h1 {
  font-size: 40px;
  font-weight: 400;
  margin-bottom: 16px;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

h2 {
  font-size: 28px;
  font-weight: 400;
  margin-top: 48px;
  margin-bottom: 16px;
}

h3 {
  font-size: 20px;
  font-weight: 500;
  margin-top: 32px;
  margin-bottom: 12px;
}

p {
  margin-bottom: 16px;
  color: var(--text-primary);
}

.subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-weight: 400;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.dev-card {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px;
  background: var(--bg-card);
  transition: box-shadow 0.2s;
  text-decoration: none;
  display: flex;
  flex-direction: column;
}

.dev-card:hover {
  box-shadow: 0 1px 3px rgba(60,64,67,0.3);
}

.dev-card h3 {
  margin-top: 0;
  color: var(--text-primary);
}

.dev-card p {
  color: var(--text-secondary);
  font-size: 14px;
  flex: 1;
}

.dev-card .card-link {
  color: var(--accent-blue);
  font-weight: 500;
  font-size: 14px;
  margin-top: 16px;
}

/* Code Blocks */
pre {
  background: var(--bg-code);
  color: var(--text-inverse);
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  margin-bottom: 24px;
  line-height: 1.5;
}

code {
  font-family: var(--font-mono);
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  color: #d93025; /* typical red for inline code */
}

pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

/* Buttons */
.btn-primary {
  display: inline-block;
  background: var(--accent-blue);
  color: white;
  padding: 10px 24px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: var(--accent-blue-hover);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
  font-size: 14px;
}

th, td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
}

th {
  background: var(--bg-secondary);
  font-weight: 500;
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .sidebar {
    display: none;
  }
  .main-content {
    margin-left: 0;
    padding: 32px 24px;
  }
}