body, html {
    height: 100%;
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    background: #f0f2f5;
}

.login-box {
    padding: 40px;
    background: #ffffff;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

.login-box h3 {
    color: #333;
    font-weight: 600;
}

.form-control {
    height: 45px;
    border-radius: 5px;
    border: 1px solid #ddd;
}

.form-control:focus {
    box-shadow: none;
    border-color: #007bff;
}

.btn-primary {
    background-color: #007bff;
    border-color: #007bff;
    padding: 10px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 5px;
    transition: background-color 0.2s;
}

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

.alert {
    border-radius: 5px;
}