body {
  font-family: sans-serif;
  background: #1e3c72;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.container {
  text-align: center;
  background: rgba(0, 0, 0, 0.2);
  padding: 30px;
  border-radius: 10px;
  width: 90%;
  max-width: 400px;
}

input[type="password"] {
  padding: 10px;
  font-size: 1rem;
  width: 100%;
  border: none;
  border-radius: 5px;
  margin-top: 10px;
  margin-bottom: 15px;
}

.strength-0 { color: #ff4d4d; }  
.strength-1 { color: #ff944d; }  
.strength-2 { color: #ffd24d; }  
.strength-3 { color: #9fdf9f; }  
.strength-4 { color: #4dff88; }  


#strength-output {
  font-weight: bold;
  margin-bottom: 10px;
}

#tips-list {
  list-style: none;
  padding: 0;
  text-align: left;
}

#back-button {
  position: absolute;
  top: 20px;
  left: 20px;
  background-color: transparent;
  border: 2px solid white;
  color: white;
  padding: 8px 12px;
  border-radius: 5px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.3s ease;
}

#back-button:hover {
  background-color: rgba(255, 255, 255, 0.1);
}