/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #0066cc;
  --primary-dark: #0052a3;
  --bg-color: #ffffff;
  --bg-secondary: #f8f9fa;
  --text-color: #1a1a1a;
  --text-secondary: #666666;
  --nav-bg: #2c3e50;
  --nav-text: #ffffff;
  --border-color: #e0e0e0;
  --code-bg: #f5f5f5;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
}

/* Navigation */
nav {
  background-color: var(--nav-bg);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow);
}

nav .nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav .logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--nav-text);
  text-decoration: none;
}

nav .nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

nav .nav-links a {
  color: var(--nav-text);
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.2s;
}

nav .nav-links a:hover {
  opacity: 0.8;
}

/* Main Content */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 3rem 0 4rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  color: var(--text-color);
}

.hero .tagline {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.hero .cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background-color: var(--primary-dark);
}

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--border-color);
}

/* Typography */
h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-color);
}

h2 {
  font-size: 2rem;
  margin: 2.5rem 0 1.5rem;
  color: var(--text-color);
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-color);
}

h3 {
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
  color: var(--text-color);
}

h4 {
  font-size: 1.25rem;
  margin: 1.5rem 0 0.75rem;
  color: var(--text-color);
}

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

a {
  color: var(--primary-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Code Blocks */
code {
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 0.9em;
  background-color: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 3px;
}

pre {
  background-color: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.95em;
  line-height: 1.5;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
}

thead {
  background-color: var(--bg-secondary);
}

th {
  text-align: left;
  padding: 1rem;
  font-weight: 600;
  color: var(--text-color);
  border-bottom: 2px solid var(--border-color);
}

td {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background-color: var(--bg-secondary);
}

/* Lists */
ul, ol {
  margin: 1rem 0;
  padding-left: 2rem;
  color: var(--text-secondary);
}

li {
  margin: 0.5rem 0;
}

/* Sections */
section {
  margin-bottom: 3rem;
}

.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}

/* Badges */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-left: 0.5rem;
}

.badge-required {
  background-color: #fee;
  color: #c00;
}

.badge-optional {
  background-color: #eef;
  color: #06c;
}

/* Note/Warning Boxes */
.note {
  background-color: #e7f3ff;
  border-left: 4px solid var(--primary-color);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 4px;
}

.note p:last-child {
  margin-bottom: 0;
}

/* Diagram/Figure */
.diagram {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 2rem;
  margin: 1.5rem 0;
  text-align: center;
}

.diagram pre {
  display: inline-block;
  text-align: left;
  background-color: var(--bg-color);
  margin: 1rem 0 0;
}

/* Responsive Design */
@media (max-width: 768px) {
  nav .nav-container {
    flex-direction: column;
    gap: 1rem;
  }

  nav .nav-links {
    gap: 1rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero .tagline {
    font-size: 1rem;
  }

  main {
    padding: 2rem 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  table {
    font-size: 0.9rem;
  }

  th, td {
    padding: 0.75rem;
  }
}

/* Footer */
footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 2rem;
  text-align: center;
  margin-top: 4rem;
  color: var(--text-secondary);
}