body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(45deg, #1e3c72, #2a5298);
    font-family: 'Arial', sans-serif;
}

.login-container {
    width: 350px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 10px;
    padding: 40px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.login-box h2 {
    text-align: center;
    color: #fff;
    margin-bottom: 30px;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    color: #fff;
    margin-bottom: 5px;
}

.input-group input {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.input-group input:focus {
    outline: none;
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
}

button {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 5px;
    background: #4CAF50;
    color: #fff;
    cursor: pointer;
    transition: background 0.3s ease;
}

button:hover {
    background: #3e8e41;
}

.error-message {
    color: #f00;
    text-align: center;
    margin-top: 10px;
}