body {
    font-family: Roboto, sans-serif;
    font-size: 16px;
    color: #333;
    line-height: 1.6;
    background-color: #f5f5f5;
    margin: 20px;
}

nav {
    margin-bottom: 20px;
}

nav a {
    margin-right: 10px;
    text-decoration: none;
    color: #0077cc;
}

nav a:hover {
    text-decoration: underline;
}

h1 {
    color: #2c3e50;
}

.container {
    background: white;
    padding: 20px;
    border-radius: 10px;
}
.ref-list {
  counter-reset: ref;
  padding-left: 0;
  margin-top: 15px;
}

.ref-list li {
  list-style: none;
  margin-bottom: 10px;
  padding: 10px 14px;
  background: #f7f9ff;
  border: 1px solid #e1e8ff;
  border-radius: 10px;
  position: relative;
  padding-left: 45px;
  font-family: 'Roboto', sans-serif;
  font-size: 14px;
  line-height: 1.4;
}

.ref-list li::before {
  counter-increment: ref;
  content: counter(ref);
  position: absolute;
  left: 14px;
  top: 10px;
  background: #2f5cff;
  color: white;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  text-align: center;
  font-size: 12px;
  line-height: 22px;
  font-weight: bold;
}

.ref-link {
  text-decoration: none;
  color: #1f2a44;
}

.ref-link:hover {
  text-decoration: underline;
  color: #2f5cff;
}

.ref-text {
  color: #1f2a44;
}

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

.fig img {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    height: auto;
}

.fig figcaption {
    font-style: italic;
    font-size: 14px;
    margin-top: 8px;
    color: #333;
}

figcaption {
  font-size: 14px;
  color: #555;
}