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

:root {
  --primary-color: #0066cc;
  --secondary-color: #00a8e8;
  --accent-color: #00d4ff;
  --text-color: #1a1a1a;
  --text-light: #666666;
  --bg-color: #ffffff;
  --bg-light: #f5f7fa;
  --border-color: #e0e0e0;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--secondary-color);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

p {
  margin-bottom: 1rem;
}

ul, ol {
  margin-bottom: 1rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 4rem 0;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(0, 102, 204, 0.3);
}

.btn:hover {
  background-color: var(--secondary-color);
  transform: translateY(-2px);
  color: white;
  box-shadow: 0 4px 12px rgba(0, 102, 204, 0.4);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

.btn-secondary {
  background-color: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
  box-shadow: none;
}

.btn-secondary:hover {
  background-color: var(--primary-color);
  color: white;
  box-shadow: 0 4px 12px rgba(0, 102, 204, 0.4);
}

.btn-secondary {
  background-color: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

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

.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.card {
  background: white;
  border-radius: 8px;
  padding: 2rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.bg-light {
  background-color: var(--bg-light);
}

.text-center {
  text-align: center;
}

.lead {
  font-size: 1.25rem;
  color: var(--text-light);
  margin-top: 1rem;
}

main {
  flex: 1;
}

code {
  background-color: #f5f7fa;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
}

pre {
  background-color: #1a1a1a;
  color: #00d4ff;
  padding: 1rem;
  border-radius: 6px;
  overflow: auto;
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .section {
    padding: 2rem 0;
  }
}