body {
  background-color: #111;
  color: white;
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 20px;
}

h1 {
  text-align: center;
}

.layout {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.visualization {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 20px;
  position: relative;
}

.circle {
  width: 50px;
  height: 50px;
  background-color: skyblue;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 18px;
  transition: transform 0.5s ease, background 0.3s ease;
  position: relative;
}

.highlight {
  background-color: orange;
  border: 2px solid yellow;
  z-index: 2;
}

.done {
  background-color: limegreen;
}

.connector {
  position: absolute;
  height: 4px;
  background: yellow;
  bottom: -12px;
  border-radius: 2px;
  z-index: 1;
}

#status {
  margin-top: 20px;
  font-size: 16px;
  min-height: 24px;
}

pre.code-block {
  background-color: #222;
  color: #eee;
  padding: 20px;
  margin-top: 30px;
  border-radius: 8px;
  overflow-x: auto;
  max-width: 700px;
  width: 100%;
  font-family: monospace;
  font-size: 15px;
  line-height: 1.6;
  white-space: pre-wrap;
  position: relative;
}

.highlight-line {
  background-color: rgba(255, 255, 0, 0.2);
  border-left: 4px solid yellow;
  padding-left: 6px;
}

.buttons {
  margin-top: 20px;
}

button {
  background: #444;
  color: white;
  padding: 10px 16px;
  margin: 0 10px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
}

button:hover {
  background: #666;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.status-icon {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1em;
}

.status-icon img {
  width: 20px;
  height: 20px;
}