* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 7px;
}

body {
    font-family: 'Open Sans', sans-serif;
    color: #fff;
    font-size: 1.6rem;
    line-height: 1.5;
    text-align: center;
    background-color: #333;
}

a {
    text-decoration: none;
}

ul {
    list-style-type: none;
}

p {
    padding: 1.6rem 0;
    font-size: 2rem;
}

img {
    max-width: 100%;
    height: auto;
}

.clearfix::after {
    content: "";
    display: block;
    clear: both;
}

/* Header */
header {
    height: auto;
   
}

header .bg-image {
    height: 80rem;
    position: absolute;
    background-image: url(img/drone.webp);
    background-size: cover;
    background-position:center;
    
    width: 100%;
    opacity: 0.7;
    z-index: -1;
}



header h1 {
    padding: 11rem;
    padding-bottom: 0;
}

.btn {
    display: inline-block;
    background-color: #614E9C;
    color: #fff;
    border: 1px solid #666;
    padding: 1.6rem 3.2rem;
    margin: 2.5rem 0;
    transition: all 0.3s linear;
    border-radius: 1rem;
    font-size: 2rem;
    font-weight: bold;
}

/*
.btn:hover {
    background-color: #eaeaea;
    color: #333;
    cursor: pointer;
    
}
*/



/**section-a**/
#section-a {
    background-color: #eaeaea;
    color: #333;
    padding: 3.2rem 0;
}

/**section-b**/
#section-b {
    background: url(img/space.jpg) no-repeat center center fixed;
    background-size: cover;

}

#section-b ul {
    list-style: none;
}

#section-b li {
    background: transparent;
    border-radius: 50%;
    width: 40vw;
    height: auto;
    color: rgb(179, 179, 179);
    margin-bottom: 1.5rem;

    height: fit-content;
    display: flexbox;
}
#section-b li p{
    background-color: #333;
    
}
.imgDiv{  /* circle border for images */
    border: 1rem solid transparent;
    border-radius: 50%;
    width: 40vw;
    height: auto;
}

/*
#section-b li .col {
    cursor: pointer;
    transition: opacity 0.7s ease-in-out;
}


#section-b li .col:hover {
    opacity: 0.83;
}
*/


.col-content {


    padding: 1.5rem;
    text-align: center;
    
    
}
.col-content p{
    display: none;
    padding: 2rem;
    border-radius: 2rem;
    margin-top: 2rem;
}
.col-content .col-title{
    display:block;
    color: #fff;
}

.col-content .col-title-department {
    display: block;
    color: #ffeba7;
}



/**section-d**/

#section-d .box {
    padding: 5rem;
}

#section-d .box:first-child {
    background-color: #2690d4;
}

/**footer**/
footer {
    padding: 4rem;
    line-height: 3rem;
    background: #000;
}

footer a {
    color: #2690d4;
}
@media screen and (max-width:400px) {

    html {
        font-size: 20px;
    }

    .content p {
        font-size: 20px;
    }
}


@media screen and (min-width:576px) {

    html {
        font-size: 25px;
    }


    header {
        height: 50rem;
    }

    
    .content  {
        padding: 50px;
    }

    .content p {
        font-size: 35px;
    }

    .content h1 {
        font-size: 45px;
    }

}




@media screen and (min-width:800px) {

    html {
        font-size: 15px;
    }
}

/**En az 1200px ve fazlası**/
@media screen and (min-width:1200px) {
    #section-b li {
        width: 28%;
        margin: 1%;
        display: inline-block;
    }

    .box {
        width: 50%;
        float: left;
    }

    html {
        font-size: 12px;
    }
}

/* Navbar */

nav {
    width: 100%;
    font-family: 'Montserrat', sans-serif;
    background-color: #000;
    color: #fff;
    padding-top: 2.4rem;
    padding-bottom: 2.4rem;
    position: absolute;
    top: 0;
    /* Sayfa üzerindeki bütün elemanların navbarın arkasında kalmasını sağlar */
    z-index: 500;
}

#logo-box {
    float: left;
    padding-top: .5rem;
}

#logo-box .logo {
    
    font-weight: 700;
    font-size: 3.2rem;
}

#nav-links {
    float: right;
}

#nav-links .nav-item {
    float: left;
    margin: .4rem;
}

#nav-links .nav-link {
    color: #fff;
    font-size: 1.6rem;
    font-weight: 700;
    display: block;
    padding: 1.6rem;
    letter-spacing: .1rem;
    transition: color .3s;
}

#nav-links .nav-link:hover {
    color: #ffeba7;
}

#nav-links .nav-icon {
    display: none;
}

@media (max-width: 992px) {

    #logo-box {
        float: none;
        text-align: left;
    }

    #nav-links {
        float: right;

    }

    #nav-links.responsive li:not(:first-child) {
        display: none;
    }

    #nav-links .nav-link {

        font-size: 2rem;
        padding-left: 0;
    }

    #nav-links .nav-item {

        float: none;
        text-align: left;
    }

    #nav-links .nav-icon {
        display: block;
        position: absolute;
        top: 10px;
        right: 5px;
        font-size: 3rem;
    }
}