/* Improved section headers */
h2 {
    border-bottom: 2px solid #3498db;
    padding-bottom: 8px;
    margin-top: 30px;
}

h3 {
    border-left: 3px solid #3498db;
    padding-left: 10px;
    margin-top: 20px;
}

/* Code block enhancements */
.cell-output {
    background-color: #f8f8f8;
    border-left: 3px solid #28a745;
    padding-left: 10px;
}

/* Callout styling */
.callout {
    border-radius: 5px;
    box-shadow: 0 1px 5px rgba(0, 0, 0, 0.1);
    margin: 20px 0;
}

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

table th {
    background-color: #f0f7ff;
}

/* Tab panels for related content */
.panel-tabset {
    border: 1px solid #dee2e6;
    border-radius: 5px;
    margin: 20px 0;
}

.exercise {
    border-left: 5px solid #4caf50; /* Green border */
    background-color: #f8f9fa;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 4px;
}

.exercise-header {
    font-weight: bold;
    color: #2e7d32; /* Darker green for header */
    font-size: 1.1em;
    margin-bottom: 10px;
}

.exercise-body {
    color: #333;
}

.exercise-time {
    font-style: italic;
    color: #666;
    margin-top: 5px;
    font-size: 0.9em;
}