body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0;
}
.login-container {
    background-color: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
}
.login-container h2 {
    margin-bottom: 20px;
    color: #333;
    font-weight: 700;
}
.form-group {
    margin-bottom: 20px;
}
.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s;
}
.form-group input:focus {
    border-color: #007bff;
    outline: none;
    box-shadow: 0 0 5px rgba(0, 123, 255, 0.3);
}
.btn-login {
    width: 100%;
    padding: 12px;
    background-color: #007bff;
    border: none;
    border-radius: 5px;
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s;
}
.btn-login:hover {
    background-color: #0056b3;
}
.error-message {
    color: #dc3545;
    background-color: #f8d7da;
    padding: 10px;
    border-radius: 5px;
    margin-top: 10px;
    font-size: 14px;
    display: none;
}
.error-message.show {
    display: block;
}