body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}
h1 {
    color: #2c3e50;
    text-align: center;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
}
h2 {
    color: #2980b9;
    border-bottom: 1px solid #eee;
    padding-bottom: 5px;
    margin-top: 40px;
}
h3 {
    color: #2c3e50;
    margin-top: 30px;
}
ul {
    list-style-type: none;
    padding-left: 0;
}
ul ul {
    list-style-type: disc;
    padding-left: 25px;
    margin-top: 5px;
    margin-bottom: 10px;
}
li {
    margin-bottom: 10px;
}
li strong {
    color: #e67e22;
}
hr {
    border: 0;
    height: 1px;
    background: #ddd;
    margin: 40px 0;
}
.notes {
    background: #f9f9f9;
    padding: 20px;
    border-left: 5px solid #3498db;
    margin-top: 40px;
}
code {
    white-space: pre-wrap;
}
span.smallcaps {
    font-variant: small-caps;
}
div.columns {
    display: flex;
    gap: min(4vw, 1.5em);
}
div.column {
    flex: auto;
    overflow-x: auto;
}
div.hanging-indent {
    margin-left: 1.5em;
    text-indent: -1.5em;
}
ul.task-list[class] {
    list-style: none;
}
ul.task-list li input[type="checkbox"] {
    font-size: inherit;
    width: 0.8em;
    margin: 0 0.8em 0.2em -1.6em;
    vertical-align: middle;
}
.display.math {
    display: block;
    text-align: center;
    margin: 0.5rem auto;
}