body {
  font-family: Arial, sans-serif;
  background: #f9f9f9;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
  align-items: center;
}

.container {
  background: white;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  width: 350px;
  margin: auto;
  flex: 0;
}

h2 { 
  text-align: center; 
  color: #2c3e50; 
  margin-top: 1rem;
}

.options { 
  margin: 1rem 0; 
}

label { 
  display: block; 
  margin: 0.5rem 0; 
}

input[type="range"], input[type="text"] {
  width: 100%; 
  padding: 0.5rem;
  margin-top: 0.2rem;
  margin-bottom: 0.5rem;
  border-radius: 5px;
  border: 1px solid #ddd;
}

button {
  background: #2c3e50;
  color: white;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  width: 100%;
  margin-top: 1rem;
}

button:hover { 
  background: #34495e; 
}

#strengthBar {
  width: 100%;
  height: 10px;
  background: #ddd;
  border-radius: 5px;
  margin-top: 0.5rem;
}

#strengthFill {
  height: 100%;
  width: 0%;
  border-radius: 5px;
  transition: width 0.3s, background 0.3s;
}

footer {
  background: #2c3e50;
  color: white;
  text-align: center;
  padding: 1rem;
  width: 100%;
  margin-top: 2rem;
}

footer a {
  color: #f39c12;
  text-decoration: none;
  margin: 0 5px;
  transition: color 0.3s;
}

footer a:hover {
  color: #ffffff;
}
.message {
  display: none; 
  background: #f44336; 
  color: white;
  padding: 0.5rem;
  margin-top: 0.5rem;
  text-align: center;
  border-radius: 5px;
}