body{
    margin: 0;
    padding: 0;
}
header{
    height: 200px;
    width: 100%;
    top: 0;
    position:relative;
    background-color: #1c747d;
    display: flex;
    justify-content: center;
    isolation: isolate;
}
.abstract{
    font-size: 1.7rem;
}
.darkmode--activated header, .darkmode--activated footer, .darkmode--activated .main_img_holder{
    filter: invert(1);
  }

.darkmode--activated main{
    background-color: rgb(210, 210, 210);
}

.darkmode--activated button{
    filter: invert(1);
}
.toptitle{
    text-align: center;
    font-size: 2rem;
    max-width: 590px;
    margin-top: 2rem;
    font-weight: bold;
    color: black;
    text-shadow: 2px 2px 2px #c0c0c0;
}

@media (max-width: 750px){
    .toptitle{
        text-shadow: 1px 1px 1px #f9f9f9;
    }

}


.header_img{
    z-index: -1;
    position:absolute;
    width: 100%;
    height: 100%;
    object-fit:cover;
    

}

footer{
    height: 50px;
    width: 100%;
    background-color: #1c747d;
    bottom: 0;
    position:relative;
    isolation: isolate;
    text-align: center;
}
.footer_text{
    color: aliceblue;
    /* padding-top: 12px; */
    margin: 0;
    padding-top: 14px;
}
main{
}
.allrq{
    align-self: center; 
    display: flex;
    flex-direction: column;
}
.rq1, .rq2{
    padding-top: 2rem;
    max-width: 1200px;
    align-self: center;
}

@media (max-width: 1200px){
    .rq1, .rq2{
        width: 700px;
        align-self: center;
    }
    

}

@media (max-width: 750px){
    .rq1, .rq2{
        width: 500px;
        align-self: center;
    }
    .caption{
        font-size: 1rem;
    }

}
.rq_div{
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-top: 2rem;
}
.RQs{
    font-weight: bold;
    font-size: 1.7rem;
}
.caption{
    text-align: center;
    font-size: 1.6rem;
}

.main_container{
    padding: 4rem;
}
.main_title{
    font-size: 2.6rem;
    font-weight: bold;
    text-align: center;
    margin-top: 2rem;
}
.main_text{
    font-size: 1.2rem;
    text-align: justify;
}
.main_text span{
    font-weight:bolder;
}
.research{
    margin-top: 4rem;
}

.main_buttons{
    display: flex;
    justify-content: center;
    padding: 0 0 2rem 0;
    gap: 1rem;
}

.ref_button{
    border-radius: 8px;
    background-color: #1c747d;
    border: none;
    margin: 0 1rem 0 1rem;
    width: 300px;
    height: 50px;
}
.ref_button a{
    text-decoration: none;
    color: aliceblue;
    padding: 1rem;
}


.darkmode-layer, .darkmode-toggle {
    z-index: 100;
  }

.img_container{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

}  
.img_title{
    text-align: center;
}

.main_img_holder{
    height: 70%;
    width: 70%;
    padding: 0 4rem 2rem 4rem;
}
.people_icon{
    margin-right: 1rem;
}
.authors_names{
    font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 1.2rem;
}
.authors_names span{
    font-weight: bolder;
    margin-right: 5px;
}
.authors_names i{
    color:#248995;
}
.darkmode--activated .authors_names i,.darkmode--activated .year i{
    filter: invert(1);
}

.refrence_container{
    display: flex;
    gap: 10px;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}
.year{
    font-weight: bolder;
    font-size: 1.2rem;
}
.year i{
    margin-right: 1rem;
    color:#248995;
}
.refrence_link{
    border: 1px solid #2c8f9a;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bolder;
    color: #2c8f9a;
    padding: 5px 8px 5px 8px;
    transition: all 0.2s ease-in-out;
    cursor: pointer;
}
.refrence_link:hover{
    color:aliceblue;
    background-color: #248995;
}
.darkmode--activated .refrence_link{
    filter: invert(1);
}
@media (max-width: 1000px){
    .toptitle{
        text-align: center;
        font-size: 1.6rem;
        max-width: 550px;
        margin-top: 2rem;
    }
}


@media (max-width: 750px){
    header{
        height: 100px;
    }
    .toptitle{
        text-align: center;
        font-size: 1.2rem;
        max-width: 350px;
        margin-top: 0.5rem;
        text-shadow: 2px 4px 4px #a3a2a2;
        margin-left: 5rem;
    }
    .main_container{
        padding: 1rem;
    }
    .main_text{
        font-size: 1rem;
        text-align: justify;
    }
    .main_buttons{
        flex-direction: column;
        justify-self: center;
        align-items: center;
    }
    .main_img_holder{
        height: 100%;
        width: 100%;
        padding: 0 1rem 2rem 1rem;
    }
    .authors_names{
        font-size: 1rem;
    }
    .year{
        font-size: 1rem;
    }
    .footer_text{

        font-size: 1rem;
    }
    
}



/* ------ Modal styles -------- */

/* Modal section for Citation */
.simpleModal{
    /* padding: 0 10rem; */
    /* color: #e0e0e0; */
}

.modal{
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    /* height: 100%;
    width: 100%; */
    /* overflow: auto; */
    background-color: #00000092;

}
.modal-content{
    background-color:#bcbcbc;
    border-radius: 15px;
    margin: 200px auto;
    padding: 20px;
    width: 490px !important;
    height: 440px !important;
    /* overflow-x: auto; */
    overflow-y: hidden;
    white-space: nowrap;
    box-shadow: 0 5px 8px 0 rgba(0,0,0,0.4), 0 7px 20px 0 rgba(0,0,0,0.3);
    animation-name: modalopen;
    animation-duration: 0.5s;


}
@keyframes modalopen{
    from{opacity: 0;}
    to{opacity: 1;}
}

.citation_content{
    width: 10000px; 
    margin-left: 10px;
    
}

.modal-content h3{
    position: absolute;
    margin-left: 190px;
    margin-top: 0px;
    font-family: raleway;
    color:rgb(67, 67, 67);
    font-size: 2rem;
    
}
.citation_box{
    background-color: #175161;
    overflow: scroll;
    margin-top: 40px;
    height: 270px;
    border-radius: 6px;
}
pre{top:0;
white-space:unset;}

.closeBtn{
    color:#6e6e6e;
    position: absolute;
    font-size: 30px;
    margin-top: -15px;
    margin-left: 430px;
}
.closeBtn:hover, .closeBtn:focus{
    color:#1c242e;
    text-decoration: none;
    cursor: pointer;
}
code{
    color:#e0e0e0 !important;
    text-align: left;
    white-space: pre-line;
    overflow-x: auto;
    overflow-y: hidden;
    
}

.citation_copy{
    color:#e0e0e0;
    background: #258973;
    padding: 5px;
    margin-top: 20px;
    border-radius: 5px;
    border: none;
    width: 100px;
    cursor: pointer;
    transition: ease-in-out 0.5s;
}

.citation_copy:hover{
    background-color:#2b6777;
    

}
/* .citation_copy:focus{
    background-color:#2b6777;
} */
.citation_download{
    color:#e0e0e0;
    background: #258973;
    border-radius: 5px;
    padding: 5px;
    margin-top: 20px;
    border: none;
    width: 100px;
    cursor: pointer;
    transition: ease-in-out 0.5s;
}
.citation_download_link{
    color:#e0e0e0  !important;
    text-decoration: none;
    
}
.citation_download:hover{
    background-color:  #175161;
}

.copy_text{
    display: none;
    color:#175161; 
    text-align: center;
    margin: 0.5rem 0 0 0;
    
}
.copy_text_show{
    display: block;
}
.modal_button_container{
    display: flex;
    justify-content: center;
    gap: 2rem;
}
@media (max-width: 700px){
    .modal-content{
        border-radius: 15px;
        margin: 200px auto;
        padding: 20px;
        width: 360px !important;
        height: 350px !important;
    }
    .modal-content h3{
        position: absolute;
        margin-left: 100px;
        margin-top: 0px;
        font-size: 1.5rem;
        
    }
    .closeBtn{
        position: absolute;
        font-size: 30px;
        margin-top: -15px;
        margin-left: 80%;
    }
    
    
}

/* test link styles : */
.test_link{
    list-style: none;
    text-decoration: none;
    
}


.test_link li{
    color: #2f2f2f;
    padding-bottom: 0.5rem;
    font-size: 1.4rem;
}

.test_link li:hover{
    color: #258973;
}

.test_link i{
    padding-right: 0.5rem;
    color: #258973;
    font-size: 1.6rem;
}


.tutorial_text{
    text-align: center;
    left: auto;
    font-weight: bold;
    font-size: 1.6rem;
    padding-bottom: 1rem;

}

.hr_sep{
    width: 50%;
    min-height: 2px;
    color: rgb(144, 144, 144);
    border: none;
    text-align: center;
    align-self: center;
    margin: 1rem auto 1rem auto;
}

.youtube{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    
}
.darkmode--activated .youtube {
    filter: invert(1);
}
@media (max-width: 700px){
    .youtube_video{
        width: 78%;
        height: 100%;
    }

}

.tutorial_title{
    font-size: 1.2rem;
    font-weight: bold;
    color: #1c747d;
}

.pdfs{
    display: flex;
    flex-direction: column;
    justify-content: start;
}

.pdf_download i{
    padding-right: 0.5rem;
    color: #258973;
    font-size: 1.6rem;
    
}


.pdf_download {
    text-decoration: none;
    color: #2f2f2f;
    padding-bottom: 0.5rem;
    font-size: 1.4rem;
    max-width: 250px;
}

.pdf_download:hover{
    color: #27a98d
}

.mac {
    padding-top: 2rem;
}

.zip{
    display: flex;
    justify-content: start;
    flex-direction: column;
    justify-content: center;
    text-align: center;
   

}

.ziplogo{
    font-size: 6rem;
    color: #175161;
    cursor: pointer;
}

.zip i:hover{
    color:#248995;
}

.ul_tests{
    display: flex;
    gap:1rem;
    justify-content: center;
}

.li_test{
    color:#000000;
    font-size: 1.4rem;
}
.li_test:hover{
    color:#248995;
}

@media (max-width: 700px){

    .ziplogo{
        font-size: 3rem;
    }
    .li_test{
        font-size: 1rem;
    }
    .pdf_download {
        text-decoration: none;
        color: #2f2f2f;
        padding-bottom: 0.5rem;
        font-size: 1rem;
    }
}