/* Global Styles */

:root {
  --primary-color: #667eea;
  --secondary-color: #764ba2;
  --text-color: #333;
  --text-muted: #666;
  --border-color: #e5e5e5;
  --background: #ffffff;
  --background-alt: #fafafa;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-color);
  line-height: 1.6;
  background: var(--background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  min-height: calc(100vh - 200px);
}

/* Typography */

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text-color);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* Code blocks */

code {
  font-family: 'Courier New', Courier, monospace;
  background: #f5f5f5;
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-size: 0.9em;
}

pre {
  background: #2d2d2d;
  color: #f8f8f2;
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1rem 0;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* Lists */

ul, ol {
  padding-left: 2rem;
}

li {
  margin-bottom: 0.5rem;
}

/* Blockquotes */

blockquote {
  border-left: 4px solid var(--primary-color);
  padding: 1rem 1.5rem;
  margin: 1rem 0;
  background: #f0f7ff;
  font-style: italic;
}

/* Tables */

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

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

th {
  background: var(--background-alt);
  font-weight: 600;
}

/* Images */

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Utilities */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 2rem; }
.mt-4 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 2rem; }
.mb-4 { margin-bottom: 3rem; }

/* Responsive */

@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  h3 {
    font-size: 1.25rem;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 13px;
  }
}

/* Accessibility */

:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Selection */

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

::-moz-selection {
  background: var(--primary-color);
  color: white;
}

/* Smooth transitions */

* {
  transition: background-color 0.2s, border-color 0.2s;
}