html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  display: flex;
  flex-direction: column;
}

#header {
  background-color: #2c3e50;
  color: white;
  padding: 0;
  display: flex;
  align-items: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#tabs {
  display: flex;
  gap: 0;
  flex: 1;
}

.tab {
  padding: 12px 24px;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  background-color: #34495e;
  border: none;
  color: rgba(255, 255, 255, 0.7);
  transition: all 0.3s ease;
  border-bottom: 3px solid transparent;
}

.tab:hover {
  background-color: #3d566e;
  color: white;
}

.tab.active {
  background-color: #2c3e50;
  color: white;
  border-bottom-color: #3498db;
}

#version-selector {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 20px;
  border-left: 1px solid #34495e;
}

#version-selector label {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
}

#version-select {
  padding: 6px 10px;
  border-radius: 4px;
  border: 1px solid #34495e;
  background-color: #34495e;
  color: white;
  font-size: 14px;
  cursor: pointer;
  outline: none;
  min-width: 150px;
}

#version-select:hover {
  background-color: #3d566e;
}

#version-select:focus {
  border-color: #3498db;
}

#container {
  flex: 1;
  position: relative;
}

#version-selector span {
  color: white;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: 14px;
  font-weight: 600;
  padding: 5px 10px;
  border: 1px solid red;
  border-radius: 5px;
  background: #ff00004f;
}