/* ── Element selector ── */
body {
  font-family: Georgia, serif;
  background-color: #f4f4f4;
  color: #222;
  margin: 0;
  padding: 20px;
}

h1 {
  color: #2c5f2e;
  border-bottom: 3px solid #2c5f2e;
  padding-bottom: 8px;
}

h2 {
  color: #3a3a3a;
  margin-top: 30px;
}

h3 {
  color: #555;
  font-style: italic;
}

a {
  color: #2c5f2e;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code {
  background-color: #e8e8e8;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
}

ol, ul {
  line-height: 1.9;
}

/* ── Class selector ── */
.intro {
  font-size: 1.05em;
  line-height: 1.7;
  max-width: 750px;
}

.caption {
  font-size: 0.85em;
  color: #666;
  margin-top: 6px;
  font-style: italic;
}

/* ── ID selectors ── */
#page-wrapper {
  max-width: 860px;
  margin: 0 auto;
  background-color: #ffffff;
  padding: 30px 40px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

#diagram-container {
  text-align: center;
  background-color: #f9f9f9;
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 16px;
  margin: 16px 0;
}

#diagram-container img {
  max-width: 100%;
  height: auto;
}