body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background-color: #121212;
    color: #e0e0e0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}
.container {
    background: #1e1e1e;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.5);
    width: 300px;
    text-align: center;
    transition: background 0.3s;
}
input {
    width: 100%;
    padding: 0.5rem;
    margin: 0.5rem 0;
    border: 1px solid #555;
    border-radius: 4px;
    box-sizing: border-box;
    transition: border-color 0.3s;
    background-color: #2c2c2c;
    color: #e0e0e0;
}
input:focus {
    outline: none;
    border-color: #007bff;
    background-color: #2c2c2c;
    color: #e0e0e0;
}
button {
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.5rem;
    background: #007bff;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.3s;
}
button:hover {
    background: #0056b3;
}
.message {
    margin-top: 0.5rem;
    color: #d9534f;
    font-weight: bold;
    height: 1.2em;
}