body {
    background-color: #1a1a1a;
    color: #f0f0f0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.login-container {
    background-color: #2a2a2a;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    max-width: 400px;
    width: 90%;
    text-align: center;
    box-sizing: border-box;
}

.lock-icon {
    margin-bottom: 1.5rem;
    color: #888;
}

h1 {
    font-size: 1.5rem;
    margin-top: 0;
    margin-bottom: 0.5rem;
    color: #fff;
}

.subtitle {
    font-size: 1rem;
    margin-bottom: 2rem;
    color: #aaa;
}

form {
    display: flex;
    flex-direction: column;
}

.input-group {
    margin-bottom: 1.5rem;
}

input[type="password"] {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    background-color: #333;
    border: 1px solid #555;
    border-radius: 4px;
    color: #fff;
    box-sizing: border-box;
    transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

input[type="password"]:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 5px rgba(0, 123, 255, 0.5);
}

button {
    background-color: #007bff;
    color: #fff;
    font-size: 1.1rem;
    font-weight: bold;
    padding: 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
}

button:hover {
    background-color: #0056b3;
}

.error-message {
    background-color: #d9534f;
    color: #fff;
    padding: 0.75rem 1rem;
    border-radius: 4px;
    margin-bottom: 1.5rem;
    text-align: left;
    font-size: 0.9rem;
}

@media (max-width: 600px) {
    .login-container {
        padding: 30px;
    }

    h1 {
        font-size: 1.25rem;
    }
}