body {
  margin: 0;
  font-family: Ubuntu, sans-serif;
  background-color: #1c1c1c;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

#simulator {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 900px;
  max-width: 100%;
  background-color: #000;
  border-radius: 16px;
  box-shadow: 0 0 40px rgba(0, 255, 255, 0.2);
  padding: 20px;
}

#screen {
  width: 100%;
  height: 520px;
  background-color: #1e1e1e;
  border: 6px solid #333;
  border-radius: 8px;
  overflow-y: auto;
  padding: 20px;
  box-sizing: border-box;
  color: white;
}

#step-content {
  width: 100%;
  height: 100%;
}

#controls {
  margin-top: 16px;
  text-align: center;
}

#instruction {
  color: #ddd;
  margin-bottom: 10px;
}

#next-button {
  background-color: #e95420;
  color: white;
  padding: 10px 20px;
  font-size: 1em;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.3s ease;
}

#next-button:hover {
  background-color: #c24114;
}

select, input[type="text"], input[type="password"], input[type="radio"], label {
  margin: 5px;
  font-size: 1em;
}

.progress-bar {
  width: 100%;
  background-color: #444;
  border-radius: 4px;
  margin-top: 20px;
}

.progress-bar-inner {
  height: 20px;
  width: 0;
  background-color: #4caf50;
  border-radius: 4px;
  transition: width 1s ease;
}

.ubuntu-background {
  background-image: url('Ubuntu_desktop.png');
  background-size: cover;
  background-position: center;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2em;
  font-weight: bold;
  text-shadow: 1px 1px 3px black;
}

.ubuntu-background-final {
  background-image: url('Ubuntu_24.04_image.png');
  background-size: cover;
  background-position: center;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2em;
  font-weight: bold;
  text-shadow: 1px 1px 3px black;
}

.ubuntu-window {
  background: white;
  color: black;
  border-radius: 12px;
  max-width: 720px;
  margin: auto;
  padding: 20px 30px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
  font-size: 1em;
  line-height: 1.5em;
}

.ubuntu-window input[type="text"],
.ubuntu-window input[type="password"] {
  width: 100%;
  padding: 10px;
  margin-bottom: 12px;
  font-size: 1em;
  border: 1px solid #ccc;
  border-radius: 6px;
  box-sizing: border-box;
}

.bios-menu {
  font-family: monospace;
  background: black;
  color: #0f0;
  padding: 10px;
  border: 2px solid #0f0;
  border-radius: 6px;
}

.usb-button {
  background-color: #3a3a3a;
  color: white;
  border: 1px solid #666;
  border-radius: 6px;
  padding: 8px 16px;
  font-size: 1em;
  cursor: pointer;
}

.usb-button:disabled {
  background-color: #2c2c2c;
  border-color: #555;
  color: #aaa;
}