body {
  margin: 0;
  font-family: Arial, sans-serif;
}

header {
  background: #2f4f4f;
  color: white;
  padding: 10px;
}

.container {
  display: grid;
  grid-template-columns: 240px 1fr 200px;
}

.sidebar {
  background: #f5f5f5;
  padding: 10px;
}

main {
  padding: 15px;
}

.toc {
  background: #fafafa;
  padding: 10px;
  border-left: 1px solid #ccc;

  position: sticky;
  top: 10px;
  height: fit-content;
}

.toc ul {
  padding-left: 15px;
}

.toc a {
  font-size: 14px;
}

a {
  color: #0645ad;
}

table {
  border-collapse: collapse;
  width: 100%;
}

td, th {
  border: 1px solid #ccc;
  padding: 6px;
}

th {
  background: #eee;
}

footer {
  background: #2f2f2f;
  color: #ddd;
  margin-top: 30px;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  padding: 15px;
  flex-wrap: wrap;
}

.footer-left {
  font-size: 14px;
}

.footer-center a {
  color: #9ecbff;
  margin: 0 5px;
  text-decoration: none;
}

.footer-center a:hover {
  text-decoration: underline;
}

.footer-right {
  font-size: 12px;
}

.footer-bottom {
  text-align: center;
  font-size: 12px;
  padding: 10px;
  border-top: 1px solid #555;
}

.center-fig {
  text-align: center;
  margin: 20px 0;
}

.center-fig img {
  max-width: 20%;
  height: auto;
}

img {
  pointer-events: none;
}

.caption {
  text-align: center;
  font-size: 14px;
  color: #666;
}