/* Custom CSS for the book */

/* General styling */
body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333;
}

/* Headers */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  color: #2c3e50;
  margin-top: 30px;
  margin-bottom: 15px;
}

h1 {
  color: #1a252f;
  border-bottom: 3px solid #3498db;
  padding-bottom: 10px;
}

h2 {
  color: #2c3e50;
  border-bottom: 2px solid #e74c3c;
  padding-bottom: 5px;
}

h3 {
  color: #34495e;
  border-left: 4px solid #f39c12;
  padding-left: 10px;
}

/* Code blocks */
pre {
  background-color: #f8f9fa;
  border: 1px solid #dee2e6;
  border-radius: 5px;
  padding: 15px;
  overflow-x: auto;
  font-size: 0.9em;
}

code {
  background-color: #f8f9fa;
  color: #e83e8c;
  padding: 2px 4px;
  border-radius: 3px;
  font-family: "Consolas", "Monaco", "Courier New", monospace;
}

/* R output */
.r {
  background-color: #f8f9fa;
}

/* Blockquotes */
blockquote {
  border-left: 4px solid #3498db;
  background-color: #f8f9fa;
  padding: 10px 20px;
  margin: 20px 0;
  font-style: italic;
}

/* Tables */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 20px 0;
}

table th, table td {
  border: 1px solid #dee2e6;
  padding: 8px 12px;
  text-align: left;
}

table th {
  background-color: #f8f9fa;
  font-weight: 600;
  color: #2c3e50;
}

table tr:nth-child(even) {
  background-color: #f8f9fa;
}

/* Navigation */
.book-summary {
  background-color: #2c3e50;
}

.book-summary ul.summary li a {
  color: #ecf0f1;
  padding: 8px 15px;
}

.book-summary ul.summary li a:hover {
  background-color: #34495e;
  color: #ffffff;
}

.book-summary ul.summary li.active > a {
  background-color: #3498db;
  color: #ffffff;
}

/* Buttons */
.btn {
  background-color: #3498db;
  color: white;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  margin: 5px;
}

.btn:hover {
  background-color: #2980b9;
}

/* Alerts and callouts */
.alert {
  padding: 15px;
  margin: 20px 0;
  border-radius: 5px;
  border: 1px solid transparent;
}

.alert-info {
  background-color: #d1ecf1;
  border-color: #bee5eb;
  color: #0c5460;
}

.alert-warning {
  background-color: #fff3cd;
  border-color: #ffeaa7;
  color: #856404;
}

.alert-danger {
  background-color: #f8d7da;
  border-color: #f5c6cb;
  color: #721c24;
}

/* Math */
.math {
  font-size: 1.1em;
}

/* Figures */
.figure {
  text-align: center;
  margin: 20px 0;
}

.caption {
  font-style: italic;
  color: #666;
  margin-top: 10px;
}

/* Responsive design */
@media (max-width: 768px) {
  .book-body {
    padding: 15px;
  }
  
  pre {
    font-size: 0.8em;
  }
  
  table {
    font-size: 0.9em;
  }
}