@keyframes crossfade {
    0% {
        opacity: 0;
    }
    25% {
        opacity: 1;
    }
    75% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

.background-container img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 2s ease-in-out;
}
    
.background-container img.fade {
    opacity: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
    background-color: rgba(255, 255, 255, 0.39); 
    backdrop-filter: blur(2px); 
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    position: relative;
    z-index: 10;
}

.login-logo .logo {
    display: block;
    margin: 0 auto;
    max-width: 80%;
    height: auto;
}

.login-header {
    text-align: center;
    margin-top: 10px;
    margin-bottom: 20px;
    color: #333;
    font-size: 1.5rem; 
}

.login-form .form-group {
    margin-bottom: 15px;
}

.input-field {
    width: calc(100% - 20px);
    padding: 10px;
    margin: 0 auto;
    display: block;
    border: 1px solid #ccc;
    box-sizing: border-box;
}

.remember-me {
    display: flex;
    align-items: center;
}

.checkbox {
    margin-right: 5px;
}

.checkbox-label {
    margin: 0;
}

.login-button {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
    padding: 10px;
    border-radius: 4px;
    margin-top: 20px;
    text-align: center;
}

.checkbox {
    margin: 0;
    padding: 0;
    position: relative;
    display: inline-block;
    width: 22px;
    height: 22px;
    background-color: #f4f7f6;
    border-radius: 4px;
    border: 2px solid #ccc;
    cursor: pointer;
}

.checkbox:checked {
    background-color: #007bff;
    border-color: #007bff;
}

.checkbox-label {
    display: inline-block;
    margin-left: 8px;
    font-size: 16px;
    color: #333;
    cursor: pointer;
}

.input-field:focus {
    border-color: #007bff;
    box-shadow: 0 0 0 0.2rem rgba(0,123,255,.25);
}

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

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

.text-center {
    text-align: center;
}

@media (max-width: 600px) {
    .login-container {
        margin: 20px;
        padding: 20px;
    }

    .login-form {
        margin-top: 20px;
    }
}

@media (max-width: 768px) {
    .login-container {
        max-width: 90%;
        padding: 15px;
    }

    .login-header {
        font-size: 1.25rem;
    }

    .login-form .form-group {
        margin-bottom: 10px;
    }
}

@media (max-width: 480px) {
    .login-header {
        font-size: 1rem;
    }

    .login-logo .logo {
        max-width: 100%;
    }

    .input-field, .login-button, .checkbox-label {
        font-size: 0.9rem;
    }

    .login-form .form-group {
        margin-bottom: 8px;
    }
}