body {
        background: linear-gradient(to bottom, #f3f4f6, #e5e7eb);
        height: 100vh;
        display: flex;
        justify-content: center;
        align-items: center;
        font-family: 'Roboto', sans-serif;
        margin: 0;
    }
    .toggle-password {
            position: absolute;
            right: 15px;
            top: 50%;
            transform: translateY(-50%);
            cursor: pointer;
            color: #888;
        }
    .position-relative .form-control {
            padding-right: 2.5rem;
        }

    .login-container {
        max-width: 400px;
        width: 100%;
        background: #fff;
        border-radius: 10px;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        padding: 30px;
        margin: 20px;
        text-align: center;
    }
    .login-container h4 {
        color: #333;
        margin-bottom: 20px;
    }
    .login-container .brand-name {
        font-size: 28px;
        font-weight: 700;
        color: #4b5563;
        margin-bottom: 10px;
    }
    .btn-primary {
        background: #4b5563;
        border: none;
    }
    .btn-primary:hover {
        background: #374151;
    }
    .form-control {
        border-radius: 20px;
    }
    .alert {
        border-radius: 20px;
    }
    .brand-name img.logo {
        max-width: 75%; 
        height: auto; 
        max-height: 80px; 
        margin-bottom: 20px;
    }
    footer {
        margin-top: 20px;
        font-size: 12px;
        color: #6b7280;
    }


    @media (max-width: 576px) {
        .login-container {
            width: 90%; 
            padding: 20px;
            margin: 10px auto;
        }
    }

    .form-group.position-relative {
        position: relative; 
        min-height: calc(1.5em + .75rem + 2px + 1.5rem); 
        margin-bottom: 15px; 
    }

    .invalid-feedback {
        position: absolute; 
        bottom: -1.5rem; 
        left: 0; 
        width: 100%;
        margin-top: 0; 
        z-index: 1;
    }


    .toggle-password {
        position: absolute;
        right: 15px;
        top: 50%;
        transform: translateY(-50%);
        cursor: pointer;
        color: #888;
        z-index: 2; 
    }