body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  background-color: #f1f3f5;
  color: #333;
}

header {
  background-color: #4a90e2;
  color: #fff;
  padding: 1em;
  text-align: center;
}

main {
  padding: 1em;
  display: flex;
  flex-direction: column;
  align-items: center;
}

#input-section {
  width: 80%;
  max-width: 800px;
  margin-bottom: 1em;
  text-align: center;
}

#prompt-input {
  width: 100%;
  height: 100px;
  padding: 0.5em;
  font-size: 1em;
  border: 2px solid #4a90e2;
  border-radius: 4px;
  box-sizing: border-box;
  resize: vertical;
}

#generate-btn {
  margin-top: 0.5em;
  padding: 0.5em 1em;
  font-size: 1em;
  background-color: #4a90e2;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

#generate-btn:hover {
  background-color: #357ABD;
}

#diagram-section {
  border: 2px solid #ccc;
  background-color: #fff;
  width: 800px;
  height: 600px;
  position: relative;
  overflow: hidden;
}

svg {
  width: 100%;
  height: 100%;
}

/* Animations for nodes */
.node {
  opacity: 0;
  animation: fadeIn 0.8s forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

/* Edge styles */
.edge {
  stroke: #888;
  stroke-width: 2;
  marker-end: url(#arrowhead);
}