body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 20px;
  height: 100vh;
}

.container {
  background-color: #fff;
  padding: 40px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  width: 300px;
}

.control-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 5px;
}

select {
  width: 100%;
  padding: 5px;
}

.color-box {
  width: 100%;
  height: 40px;
  margin-top: 10px;
  border-radius: 4px;
  background-color: #ddd;
}

.door-list {
  margin-top: 0;
  display: flex;
  gap: 20px;
  width: 900px;
}

.door-group {
  flex: 1;
}

.door-group {
  margin-bottom: 20px;
}

.door-list ul {
  list-style: none;
  padding: 5px;
  max-height: 800px;
  overflow-y: auto;
  border: 1px solid #eee;
  border-radius: 4px;
}

.door-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 8px;
  border-bottom: 1px solid #eee;
  font-size: 14px;
}

.door-list li:last-child {
  border-bottom: none;
}

.group-indicators {
  display: flex;
  gap: 4px;
}

.group-indicators span {
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

/* Group colors */
.group-a { background-color: #f1c40f; }
.group-b { background-color: #9b59b6; }
.group-c { background-color: #e67e22; }