body {
            background-color: #f4f6f9;
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        .login-box {
            width: 360px;
            background: #fff;
            border-radius: 10px;
            padding: 30px 25px;
            box-shadow: 0 1px 2px rgba(0,0,0,0.1);
        }

        .login-logo img {
            width: 100px;
/*            margin-bottom: 20px;*/
        }

        .login-box h3 {
            font-size: 23px;
            font-weight: 400;

        }
        .exam-type {
            font-size: 14px;
            color: #16639d;
            text-align: center;
            margin-bottom: 15px;
        }
        .form-control {
            border-radius: 8px;
            box-shadow: none !important;
        }

        .form-control:focus {
            border-color: #ccc;
            outline: none;
            box-shadow: none;
        }

        .input-group-text {
            background-color: #f4f6f9;
            border-radius: 8px 0 0 8px;
        }

        #usernameError, #passwordError, #validationError {
            color: red;
            font-size: 0.875rem;
            width: 100%;
            text-align: center;
        }


        /* Submit Button */
        button[type="submit"] {
            background-color: #16639d;
            color: #fff;
            padding: 10px 0;
            border: none;
            border-radius: 10px;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }

        button[type="submit"]:hover {
            background-color: #0f5289;
        }

        .back-link {
            display: block;
            margin-top: 15px;
            text-align: center;
            font-size: 14px;
            color: #16639d;
            text-decoration: none;
        }

        .back-link:hover {
            text-decoration: underline;
        }


         /* Mobile specific styles */
         @media (max-width: 767px) {
            .login-box {
                margin: 20px;
                padding: 20px 15px;
            }
        }